CN114081696B - Vascular stent releasing device - Google Patents
Vascular stent releasing device Download PDFInfo
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- CN114081696B CN114081696B CN202111624954.6A CN202111624954A CN114081696B CN 114081696 B CN114081696 B CN 114081696B CN 202111624954 A CN202111624954 A CN 202111624954A CN 114081696 B CN114081696 B CN 114081696B
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- 230000002792 vascular Effects 0.000 title claims abstract description 22
- 238000011084 recovery Methods 0.000 claims abstract description 47
- 210000000078 claw Anatomy 0.000 claims abstract description 44
- 238000004064 recycling Methods 0.000 claims abstract description 5
- 229910001000 nickel titanium Inorganic materials 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 7
- 239000011295 pitch Substances 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 3
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims 2
- HLXZNVUGXRDIFK-UHFFFAOYSA-N nickel titanium Chemical compound [Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni] HLXZNVUGXRDIFK-UHFFFAOYSA-N 0.000 claims 2
- 238000006073 displacement reaction Methods 0.000 claims 1
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- 238000011282 treatment Methods 0.000 description 3
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- 206010060965 Arterial stenosis Diseases 0.000 description 2
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- 208000031481 Pathologic Constriction Diseases 0.000 description 1
- 208000018262 Peripheral vascular disease Diseases 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 208000006011 Stroke Diseases 0.000 description 1
- 238000002399 angioplasty Methods 0.000 description 1
- 230000010100 anticoagulation Effects 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000003143 atherosclerotic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2/962—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve
- A61F2/966—Instruments specially adapted for placement or removal of stents or stent-grafts having an outer sleeve with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2/9522—Means for mounting a stent or stent-graft onto or into a placement instrument
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Abstract
The invention relates to the field of medical equipment, in particular to a vascular stent release device. A vascular stent delivery device, comprising: the foot stool is provided with a center section, a pushing section connected to one end of the center section and a recovery section connected to the other end of the center section, wherein the pushing section is provided with a pushing claw which elastically protrudes outwards along the radial direction towards the distal end direction, and the recovery section is provided with a recovery claw which elastically protrudes outwards along the radial direction towards the proximal end direction; the inner tube is fixedly connected with the central section of the foot rest; the middle tube is sleeved outside the inner tube and the foot rest, the far end of the middle tube is provided with a first opening which is suitable for the pushing section of the foot rest to extend out, and the side wall of the far end of the middle tube is provided with a second opening which is suitable for the recycling section of the foot rest to extend out; when the pushing section of the foot rest extends out of the first opening, the recovery section of the foot rest is retracted into the middle pipe, and when the recovery section of the foot rest extends out of the second opening, the pushing section of the foot rest is retracted into the middle pipe; the outer tube is sleeved outside the middle tube, and a bracket is suitable for being contained between the outer tube and the middle tube.
Description
Technical Field
The invention relates to the field of medical equipment, in particular to a vascular stent release device.
Background
Atherosclerotic stenosis is a major cause of coronary heart disease, cerebral infarction and peripheral vascular disease. The appearance of lipid accumulated in the intima of an artery is yellow, and is therefore known as atherosclerosis.
Actively and effectively treat arterial stenosis, and has important significance for preventing and treating apoplexy. At present, the prevention of atherosclerosis often adopts the treatments of controlling vascular risk factors, resisting blood platelets, anticoagulation, high pressure resistance and the like, but has difficult satisfactory curative effects on the treatment of arterial lesions.
With the progress of technology, angioplasty and stent implantation are effective means for treating arterial stenosis due to the advantages of safety, reliability, small damage and definite curative effect. However, the vascular stent has the problems of being only releasable and difficult to recycle, and once an operator makes errors in release, sequelae are easily left for a patient.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the vascular stent in the prior art is difficult to recover during release, so as to provide the vascular stent release device.
In order to solve the above problems, the present invention provides a stent releasing device comprising:
The foot stool is provided with a center section, a pushing section connected to one end of the center section and a recovery section connected to the other end of the center section, wherein the pushing section is provided with a pushing claw which elastically protrudes outwards along the radial direction towards the distal end direction, and the recovery section is provided with a recovery claw which elastically protrudes outwards along the radial direction towards the proximal end direction;
The inner tube is fixedly connected with the central section of the foot rest;
The middle tube is sleeved outside the inner tube and the foot rest, the distal end of the middle tube is provided with a first opening which is suitable for the pushing section of the foot rest to extend out, and the side wall of the distal end of the middle tube is provided with a second opening which is suitable for the recycling section of the foot rest to extend out; when the pushing section of the foot rest is extended out of the first opening, the recovering section of the foot rest is retracted into the middle pipe, and when the recovering section of the foot rest is extended out of the second opening, the pushing section of the foot rest is retracted into the middle pipe;
the outer tube is sleeved outside the middle tube, and a support is suitable for being contained between the outer tube and the middle tube.
Optionally, the foot rest is made of a memory alloy material at least in the pushing section and the recovering section.
Optionally, the foot rest adopts a nickel-titanium alloy hypotube, and the pushing claw of the pushing section and the recycling claw of the recycling section are formed by cutting at two ends of the nickel-titanium alloy hypotube.
Optionally, the free ends of the pushing jaw and/or the recovery jaw have a bending structure bent towards the central direction.
Optionally, the inner tube and the proximal end of the middle tube are adapted to be clampingly connected by a first locking member.
Optionally, a first mark and a second mark are sequentially arranged on the inner tube at the outlet end of the first locking piece, and when the first mark is positioned at the outlet end of the first locking piece, the pushing section of the foot rest stretches out of the middle tube so that the pushing claw is elastically opened outwards along the radial direction; when the second mark is positioned at the outlet end of the first locking piece, the recovery section of the foot rest extends out of the middle tube so that the recovery claw is elastically opened outwards along the radial direction.
Optionally, the intermediate tube and the proximal end of the outer tube are adapted for axial movement adjustment by a threaded arrangement.
Optionally, the method further comprises: the operation handle is provided with a rotary sleeve and stop blocks blocked at two ends of the rotary sleeve, a guide rail is sleeved in the rotary sleeve, and two ends of the guide rail are respectively connected with the two stop blocks;
A first sliding block and a second sliding block are arranged in the guide track in a sliding way, and external threads for being in threaded fit with the inner wall of the rotary sleeve are respectively arranged on the outer walls of the first sliding block and the second sliding block;
the second sliding block is fixedly connected with the outer tube, and the first sliding block is fixedly connected with the middle tube.
Optionally, the first internal thread on the interior of the rotating sleeve for cooperation with the first slider and the second internal thread for cooperation with the second slider have different pitches.
Optionally, a flexible tip is connected to the distal end of the inner tube, the flexible tip having a first channel in the center adapted for passage of a guidewire.
The technical scheme of the invention has the following advantages:
1. When the stent is conveyed, the stent is sleeved on the middle tube, the middle tube and the stent are wrapped in the outer tube together, when the stent is conveyed to a target position, a foot rest positioned in the middle tube is driven by the inner tube to enable a pushing section of the foot rest to extend out of the middle tube, pushing claws of the pushing section are unfolded along the radial direction to form abutting connection with the stent, and then the stent is pushed out of the outer tube towards the far end by the relative movement of the inner tube and the outer tube; when the support needs to be recovered, the inner tube drives the foot rest to move towards the proximal end, so that the pushing section of the foot rest is retracted into the middle tube, the recovery section of the foot rest extends out of the second opening of the middle tube, and after the recovery claw of the recovery section is unfolded outwards along the radial direction, the recovery claw can be used for hooking the ends of the support in an unfolded state one by one, so that the support is retracted into the outer tube; the device can realize smooth release and recovery of the bracket.
2. The vascular stent releasing device provided by the invention has the advantages that the foot rest at least adopts the memory alloy material in the pushing section and the recovering section, so that the pushing section and the recovering section have the shape memory function, and the corresponding functions can be conveniently completed when the stent is released in pushing and recovering.
3. According to the vascular stent releasing device provided by the invention, the scaffold adopts the nickel-titanium alloy hypotube, the pushing claw of the pushing section and the recovery claw of the recovery section are cut and formed at two ends of the nickel-titanium alloy hypotube, and the sizes of the pushing claw and the recovery claw are more accurate due to the cutting and forming.
4. According to the vascular stent release device provided by the invention, the free ends of the pushing claw and the recovering claw are provided with the bending structures which are bent towards the center direction, and the bending structures are designed to effectively avoid damage to the outer tube of the sleeved stent.
5. According to the vascular stent release device provided by the invention, the proximal ends of the inner tube and the middle tube are suitable for being connected in a clamping way through the first locking piece, so that synchronous movement and relative movement between the inner tube and the middle tube are realized, and meanwhile, the first locking piece can also seal the space between the inner tube and the middle tube, so that blood cannot flow out of the space between the inner tube and the middle tube.
6. According to the vascular stent release device provided by the invention, the first mark and the second mark which are sequentially arranged are arranged at the outlet end of the first locking piece on the inner tube, and when the first mark is positioned at the outlet end of the first locking piece, the pushing section of the foot stand extends out of the middle tube so that the pushing claw is elastically opened outwards along the radial direction, thus being beneficial to pushing the claw to push the release of the stent; when the second mark is positioned at the outlet end of the first locking piece, the recovery section of the foot rest extends out of the middle pipe so that the recovery claw is opened outwards in the radial direction, and the recovery claw can be facilitated to push the support to be recovered. The design of first sign and second sign is convenient for promote the jack catch and retrieve the jack catch and carry out the release and retrieve of support through the sign is accurate in near-end control, has the advantage of precision height, easy operation.
7. According to the vascular stent release device, the rotating sleeve is driven to drive the first sliding block and the second sliding block in the rotating sleeve to slide relatively along the axial direction, so that the middle tube connected with the first sliding block and the outer tube connected with the second sliding block move relatively along the axial direction, and the stent arranged between the distal ends of the middle tube and the outer tube is released or recovered; because the rotating sleeve and the stop blocks blocked at the two ends of the rotating sleeve are coaxially arranged, single-hand operation can be realized when the rotating sleeve is operated, and the first sliding block and the second sliding block in the rotating sleeve are simultaneously driven, so that the operation is simpler and more convenient, and the rotating sleeve is respectively in threaded fit with the first sliding block and the second sliding block, so that the operation is more accurate when the first sliding block and the second sliding block are driven to move through the rotation of the rotating sleeve, and the effect of accurately releasing the bracket is achieved.
8. According to the vascular stent release device provided by the invention, the first internal thread matched with the first sliding block and the second internal thread matched with the second sliding block on the inner wall of the rotating sleeve have different pitches, so that different pitches are suitable for different types of stents, and the accurate positioning of the stents is realized. Because the bracket extensibility of each specification is different, and the forward pushing speed and the outer tube withdrawing speed are not in direct proportion when the bracket is released, the first internal thread and the second internal thread with different screw pitches realize the accurate positioning of the bracket.
9. The invention provides a vascular stent release device, wherein the distal end of an inner tube is connected with a flexible tip, the center of the flexible tip is provided with a first channel which is suitable for a guide wire to pass through, and the guide wire is accommodated in the first channel, so that an operator can conveniently enter the flexible tip at the distal end of the inner tube into a human body blood vessel smoothly under the guidance of the guide wire after penetrating the guide wire in a through hole.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of the distal end of a stent delivery device according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of the stand shown in fig. 1.
Fig. 3 is a schematic structural view of an inner tube of a stent delivery device according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of a middle tube of a stent delivery device according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of a foot rest release portion engaged with a foot rest according to an embodiment of the present invention.
Fig. 6 is a schematic structural view of an operating handle provided in an embodiment of the present invention.
Fig. 7 is a schematic structural view of a first slider according to an embodiment of the present invention.
Fig. 8 is a schematic structural view of a second slider according to an embodiment of the present invention.
Fig. 9 is a schematic view of the rotary sleeve shown in fig. 6.
Fig. 10 is a schematic view showing the structure of the first stopper, the guide passage, and the second stopper provided in the embodiment of the invention.
Fig. 11 is a schematic view showing the structure of the first stopper, the guide passage, and the second stopper provided in the embodiment of the invention.
Fig. 12 is a schematic view showing the overall structure of the stent delivery device according to the embodiment of the present invention after the assembly is completed.
Reference numerals illustrate: 1. an inner tube; 2. a bracket; 3. a foot rest; 4. a middle tube; 5. an outer tube; 6. a pushing section; 7. a central section; 8. a recovery section; 9. a through hole; 10. pushing the claw; 11. recovering the claw; 12. a flexible tip; 13. a first channel; 14. a first identifier; 15. a second identifier; 16. a joint; 17. a release section; 18. a flexible portion; 19. a rigid portion; 20. a first locking member; 21. an outlet end; 22. a first opening; 23. a second opening; 24. a hemostatic valve; 25. a second stopper; 26. a rotating sleeve; 27. a first stopper; 28. a second locking member; 29. a first slider; 30. a first connecting rod; 31. a second connecting rod; 32. a second slider; 33. a second channel; 34. a first internal thread; 35. a second internal thread; 36. a first clamping column; 37. a guide rail; 38. slotting; 39. a second clamping column; 40. a limit groove; 41. a sliding channel.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, the vascular stent releasing device provided by the present invention includes: the foot rest 3 is provided with a center section 7, a pushing section 6 connected to one end of the center section 7 and a recovery section 8 connected to the other end of the center section 7, wherein the pushing section 6 is provided with a pushing claw 10 which elastically protrudes outwards along the radial direction towards the distal direction, and the recovery section 8 is provided with a recovery claw 11 which elastically protrudes outwards along the radial direction towards the proximal direction; the inner tube 1 is fixedly connected with the central section 7 of the foot rest 3; the middle tube 4 is sleeved outside the inner tube 1 and the foot rest 3, the distal end of the middle tube 4 is provided with a first opening 22 which is suitable for the pushing section 6 of the foot rest 3 to extend, and the side wall of the distal end of the middle tube 4 is provided with a second opening 23 which is suitable for the recovery section 8 of the foot rest 3 to extend; when the pushing section 6 of the foot rest 3 is extended out of the first opening 22, the recovery section 8 of the foot rest 3 is retracted into the middle tube 4, and when the recovery section 8 of the foot rest 3 is extended out of the second opening 23, the pushing section 6 of the foot rest 3 is retracted into the middle tube 4; the outer tube 5 is sleeved outside the middle tube 4, and the support 2 is suitable for being accommodated between the outer tube 5 and the middle tube 4.
According to the vascular stent release device provided by the invention, when the stent 2 is conveyed, the stent 2 is sleeved on the middle tube 4, the middle tube 4 and the stent 2 are wrapped in the outer tube 5 together, when the stent 2 is conveyed to a target position, the stent 3 positioned in the middle tube 4 is driven through the inner tube 1 to enable the pushing section 6 of the stent 3 to extend out of the middle tube 4, the pushing claw 10 of the pushing section 6 is unfolded along the radial direction so as to form abutting connection with the stent 2, and then the stent 2 is pushed out of the outer tube 5 towards the far end through the relative movement of the inner tube 1 and the outer tube 5; when the bracket 2 needs to be recovered, the inner tube 1 drives the foot rest 3 to move towards the proximal end, so that the pushing section 6 of the foot rest 3 is retracted into the middle tube 4, the recovery section 8 of the foot rest 3 extends out of the second opening 23 of the middle tube 4, and after the recovery claws 11 of the recovery section 8 are expanded outwards in the radial direction, the ends of the bracket 2 in the expanded state can be hooked one by one, so that the bracket 2 is retracted into the outer tube 5; the device can realize smooth release and recovery of the bracket 2.
As shown in fig. 2, the stand 3 comprises a pushing section 6, a central section 7 and a recovery section 8 which are sequentially connected, wherein the central section 7 is provided with a through hole 9 for passing through the inner tube 1, and the whole stand 3 is subjected to laser cutting, heating and forming treatment by a nickel-titanium alloy hypotube. The pushing section 6 is connected to one end of the central section 7 and is provided with a pushing claw 10 which elastically protrudes outwards along the radial direction towards the distal end; the recovery section 8 is connected to the other end of the central section 7, with recovery jaws 11 that resiliently protrude radially outwards in the proximal direction. The pushing claw 10 and the recovery claw 11 have two branch structures which are axisymmetrically arranged, and the free ends of the pushing claw 10 and the recovery claw 11 have bending structures which are bent towards the center direction. When the support 2 is released, the support 2 is pushed towards the far end by the pushing claw 10 to release, when the support 2 is recovered, the ends of the support 2 are hooked one by the recovering claw 11 to recover again, and the inner wall of the pipe containing the support 2 can be protected by the design of the bending structure.
As shown in fig. 4, the first locking member 20 is fixedly bonded to the rigid portion 19 to achieve a fixed connection of the first locking member 20 to the center tube 4. The outlet end 21 is turned, and the first locking member 20 is used for locking the inner tube 1 so as to fix the inner tube 1 and the middle tube 4 relatively to each other, so as to realize the common movement between the inner tube 1 and the middle tube 4, and also seal the space between the inner tube 1 and the middle tube 4, so that the blood does not flow out from the space between the inner tube 1 and the middle tube 4.
As shown in fig. 3, the inner tube 1 is arranged in the middle tube 4 and comprises a joint 16, a second mark 15, a first mark 14, a foot rest 3 and a flexible tip 12 which are sequentially arranged from the proximal end to the distal end, wherein the first mark 14 and the second mark 15 are positioned at an outlet end 21 of a first locking piece 20, and the inner tube 1 passes through a through hole 9 of the foot rest 3 and is fixed by welding. Alternatively, the inner tube 1 and the foot rest 3 may be fixed by bonding. When the first mark 14 is positioned at the outlet end 21 of the first locking piece 20, the pushing section 6 of the foot rest 3 extends out of the middle tube 4 to enable the pushing claw 10 to elastically open outwards along the radial direction; when the second tag 15 is positioned at the outlet end 21 of the first locking member 20, the recovery section 8 of the foot rest 3 extends beyond the central tube 4 to resiliently spread the recovery claw 11 radially outwardly.
As shown in fig. 3, both the inner tube 1 and the flexible tip 12 are provided with a first channel 13 adapted for passage of a guide wire for the release of the thromboembolic stent 2 release device through the guide wire into a release position in a blood vessel. The flexible tip 12 is made of TPU (thermoplastic polyurethane elastomer), and the inner tube 1 is made of PI (polyimide) having both support and flexibility. Alternatively, the flexible tip 12 may be made of PEBAX, silica gel, or rubber, and the inner tube 1 may be made of PA.
As shown in fig. 4, the middle tube 4 includes a rigid portion 19, a flexible portion 18, and a release portion 17 provided in this order from the proximal end to the distal end. Wherein, the proximal end and the distal end of the flexible portion 18 can be fixedly connected with the rigid portion 19 and the releasing portion 17, respectively, by welding. Alternatively, the proximal and distal ends of the flexible portion 18 may be fixedly attached to the rigid portion 19, the release portion 17, respectively, by adhesive means. The flexible portion 18 is designed to provide the middle tube 4 with better flexibility, and is made of PA (polyamide, commonly called nylon). Alternatively, the flexible portion 18 may be made of PE (polyethylene), PU (polyurethane), PEBAX (block polyether amide resin), or the like. The release portion 17 is formed by cutting a nickel-titanium alloy hypotube with laser, and the rigid portion 19 is formed by cutting a nickel-titanium alloy with laser. Alternatively, the rigid portion 19 may be cut by a spiral thread from a stainless steel tube.
As shown in fig. 5, the releasing end of the middle tube 4 has a first opening 22 adapted to the extension of the pushing section 6 of the stand 3, and a second opening 23 on the side wall adapted to the extension of the retrieving section 8 of the stand 3, and after the pushing section 6 of the stand 3 extends out of the first opening 22, the retrieving section 8 of the stand 3 is retracted into the middle tube 4, and when the retrieving section 8 of the stand 3 extends out of the second opening 23, the pushing section 6 of the stand 3 is retracted into the middle tube 4. Wherein the number of the second openings 23 on the side wall is 4, and the angle between two adjacent second openings 23 is 90 degrees. Alternatively, the number of the second openings 23 may be 2, and two second openings 23 are disposed opposite to each other.
As shown in fig. 6, the operating handle includes a hemostasis valve 24, a first stop block 27, a rotating sleeve 26, a second stop block 25 and a second locking member 28 sequentially connected from the distal end to the proximal end, the first stop block 27 and the second stop block 25 are arranged at two ends of the rotating sleeve 26 to play a role in blocking, the hemostasis valve 24 is fixedly connected with an outer tube outside the bracket, the second locking member 28 is fixedly connected with a middle tube extending into the bracket, and relative movement between the middle tube and the inner tube is realized by rotating the rotating sleeve 26.
As shown in fig. 7, a first connecting rod 30 extending towards the proximal end is connected to the first slider 29, and a second locking member 28 is connected to an end of the first connecting rod 30, where the second locking member 28 is used to lock the middle tube and the inner tube, so as to realize synchronous movement between the middle tube and the inner tube.
As shown in fig. 8, a second connecting rod 31 extending towards the distal end is connected to the second slider 32, the end of the second connecting rod 31 is connected to the hemostatic valve 24, and the outer tube is fixedly connected to the hemostatic valve 24, so as to realize the fixed connection between the slider and the outer tube. The relative movement between the outer tube and the middle tube is achieved by the relative movement of the first slider 29 and the second slider 32. In addition, the centers of the first slider 29 and the second slider 32 are respectively provided with a second passage 33 for passing through the inner tube and the middle tube, so that the middle tube and the inner tube are fixed with the second locking member 28 after passing through the first slider 29 and the second slider 32.
As shown in fig. 9, the two split-type rotating sleeves 26 are two, the two split-type rotating sleeves 26 are in clamping connection through the first clamping column 36, and the split-type rotating sleeves 26 are easy to disassemble and assemble and are convenient for operators to use. The inner wall of the rotary sleeve 26 is provided with a first internal thread 34 matched with the first sliding block 29 and a second internal thread 35 matched with the second sliding block 32, and the thread directions and the thread pitches of the first internal thread 34 and the second internal thread 35 are different. The first internal thread 34 and the second internal thread 35 are designed in opposite thread directions so that the first slider 29 and the second slider 32 rotate in different directions when the rotation sleeve 26 is screwed, to achieve relative movement. The different pitch designs of the first internal thread 34 and the second internal thread 35 enable the relative movement distance of the first sliding block 29 and the second sliding block 32 to be different according to different bracket types, so that accurate positioning of the bracket is achieved, and the bracket is combined with the elongation rate of the bracket to achieve more accurate positioning release.
As shown in fig. 10, between the first stop 27 and the second stop 25 is a guide rail 37 disposed in the rotating sleeve 26, and the first stop 27, the guide rail 37 and the second stop 25 may be integrally formed to facilitate the overall processing. The guide track 37 has a sliding channel 41 therein for receiving the first slider 29 and the second slider 32, the guide track 37 being configured to allow the first slider 29 to slide when engaged with the first internal thread 34 in the rotating sleeve 26 and the second slider 32 to slide when engaged with the second internal thread 35 in the rotating sleeve 26. Alternatively, the first stop 27, the guide rail 37 and the second stop 25 may be fixedly connected by means of adhesive, welding or the like.
As shown in fig. 10, the first stopper 27, the guide rail 37 and the second stopper 25 are engaged by the second engaging post 39 to form a slot 38 having external threads protruding from the first slider 29 and the second slider 32, and the slot 38 has two symmetrically arranged slots. The two symmetrically arranged slots 38 enable the external threads of the first slider 29 to cooperate with the first internal threads 34 at both ends to promote the stability of the rotation of the first slider 29 within the rotating sleeve 26, and the external threads of the second slider 32 to cooperate with the second internal threads 35 at both ends to promote the stability of the rotation of the second slider 32 within the rotating sleeve 26.
As shown in fig. 11, the guide rail 37 has a sliding channel 41 therein for accommodating the first slider 29 and the second slider 32, the sliding channel 41 being designed to facilitate sliding of the first slider 29 and the second slider 32 when engaged with the internal thread in the swivel housing 26. The inner wall of the sliding channel 41 is provided with limiting grooves 40 embedded in the first sliding block 29 and the second sliding block 32, the limiting grooves 40 are symmetrically arranged, and the cross section of each limiting groove 40 is arc-shaped. The limiting groove 40 is designed to limit the sliding movement of the first slider 29 and the second slider 32, and has an arc-shaped cross section so that the first slider 29 and the second slider 32 can freely slide in the sliding passage 41.
In the specific implementation process, when the bracket 2 needs to be released, the first mark 14 is positioned at the outlet end 21 of the first locking piece 20, so that the pushing claw 10 of the bracket 2 extends out of the first outlet, the pushing claw 10 is abutted against the bracket 2, the first locking piece 20 connected to the proximal end of the middle tube 4 locks the inner tube 1 to realize synchronous movement between the middle tube 4 and the inner tube 1, the rotating sleeve 26 is rotated to enable the first sliding block 29 and the second sliding block 32 to relatively move, and meanwhile, the outer tube 5 moves towards the proximal end and the middle tube 4 and the inner tube 1 move towards the distal end, and at the moment, the pushing claw 10 pushes the bracket 2 to slowly release under the action of the force of the inner tube 1 towards the distal end; when the support 2 needs to be recovered, the first locking piece 20 is loosened, the middle tube 4 is moved to enable the second mark 15 to be located at the outlet end 21 of the first locking piece 20, then the first locking is screwed, the recovery claw 11 stretches out of the second outlet to be abutted with the support 2, the first locking piece 20 connected to the proximal end of the middle tube 4 locks the inner tube 1 to achieve synchronous movement between the middle tube 4 and the inner tube 1, the rotary sleeve 26 is rotated to enable the first sliding block 29 and the second sliding block 32 to move relatively, and therefore the outer tube 5 moves distally and the middle tube 4 and the inner tube 1 move proximally at the same time, and at the moment, the recovery claw 11 pushes the support 2 to be slowly recovered under the action of the force of the inner tube 1 to the proximal end.
According to the vascular stent release device, an operator can release and recover the stent by only screwing the rotary sleeve by one hand, the vascular stent release device has the advantages of simple operation steps, convenience in release and recovery and accurate positioning, can correct errors in operation, and has good adaptability to stents of different types.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. A stent delivery device, comprising:
A foot rest (3) having a central section (7), a pushing section (6) connected to one end of the central section (7) and a retrieving section (8) connected to the other end of the central section (7), the pushing section (6) having a pushing claw (10) resiliently protruding radially outwards in a distal direction, the retrieving section (8) having a retrieving claw (11) resiliently protruding radially outwards in a proximal direction;
The inner tube (1) is fixedly connected with the central section (7) of the foot rest (3);
The middle tube (4) is sleeved outside the inner tube (1) and the foot rest (3), a first opening (22) which is suitable for the pushing section (6) of the foot rest (3) to extend is formed at the far end of the middle tube (4), and a second opening (23) which is suitable for the recycling section (8) of the foot rest (3) to extend is formed on the side wall of the far end of the middle tube (4); when the pushing section (6) of the foot rest (3) is extended out of the first opening (22), the recovery section (8) of the foot rest (3) is retracted into the middle pipe (4), and when the recovery section (8) of the foot rest (3) is extended out of the second opening (23), the pushing section (6) of the foot rest (3) is retracted into the middle pipe (4);
The outer tube (5) is sleeved outside the middle tube (4), and the support (2) is suitable for being contained between the outer tube (5) and the middle tube (4).
2. Vessel stent release device according to claim 1, characterized in that the foot rest (3) is made of a memory alloy material at least in the pushing section (6) and the retrieving section (8).
3. Vessel stent release device according to claim 2, characterized in that the foot rest (3) is a nitinol hypotube, the pushing jaws (10) of the pushing section (6) and the retrieving jaws (11) of the retrieving section (8) being cut at both ends of the nitinol hypotube.
4. The stent delivery device according to claim 1 or 2, characterized in that the free end of the pushing jaw (10) and/or the retrieving jaw (11) has a bending structure bending towards the central direction.
5. Vessel stent release device according to claim 4, characterized in that the inner tube (1) and the proximal end of the middle tube (4) are adapted to be clampingly connected by a first locking member (20).
6. Vessel stent release device according to claim 5, characterized in that the inner tube (1) has a first marking (14) and a second marking (15) arranged in sequence on the outlet end (21) of the first locking member (20), the pushing section (6) of the foot rest (3) extending out of the middle tube (4) to elastically spread the pushing jaws (10) radially outwards when the first marking (14) is located on the outlet end (21) of the first locking member (20); when the second mark (15) is positioned at the outlet end (21) of the first locking piece (20), the recovery section (8) of the foot rest (3) stretches out of the middle tube (4) so that the recovery claw (11) elastically expands outwards along the radial direction.
7. Vessel stent release device according to claim 4, characterized in that the intermediate tube (4) and the proximal end of the outer tube (5) are adapted for axial displacement adjustment by means of a screw structure.
8. The vascular stent delivery device of claim 7, further comprising: the operation handle is provided with a rotary sleeve (26) and stop blocks blocked at two ends of the rotary sleeve (26), a guide rail (37) is sleeved in the rotary sleeve (26), and two ends of the guide rail (37) are respectively connected with the two stop blocks;
a first sliding block (29) and a second sliding block (32) are arranged in the guide track (37) in a sliding way, and external threads for being in threaded fit with the inner wall of the rotary sleeve (26) are respectively arranged on the outer walls of the first sliding block (29) and the second sliding block (32);
the second sliding block (32) is fixedly connected with the outer tube (5), and the first sliding block (29) is fixedly connected with the middle tube (4).
9. The stent delivery device of claim 8, wherein the first internal thread (34) on the interior of the swivel sleeve (26) for mating with the first slider (29) and the second internal thread (35) for mating with the second slider (32) have different pitches.
10. Vessel stent release device according to any of claims 5-9, wherein a flexible tip (12) is connected to the distal end of the inner tube (1), the centre of the flexible tip (12) having a first channel (13) adapted for passage of a guide wire.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111624954.6A CN114081696B (en) | 2021-12-27 | 2021-12-27 | Vascular stent releasing device |
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| CN202111624954.6A CN114081696B (en) | 2021-12-27 | 2021-12-27 | Vascular stent releasing device |
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| CN114617684B (en) * | 2022-03-14 | 2025-02-18 | 江苏博朗森思医疗器械有限公司 | Bracket system |
| CN116549873A (en) * | 2023-05-24 | 2023-08-08 | 苏州融晟医疗科技有限公司 | A carrier delivery system for loadable particles |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101933855A (en) * | 2010-08-26 | 2011-01-05 | 先健科技(深圳)有限公司 | A kind of recoverable vascular stent and recovery method thereof |
| CN102144940A (en) * | 2010-02-04 | 2011-08-10 | 微创医疗器械(上海)有限公司 | Conveying device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE8803444D0 (en) * | 1988-09-28 | 1988-09-28 | Medinvent Sa | A DEVICE FOR TRANSLUMINAL IMPLANTATION OR EXTRACTION |
| US10278804B2 (en) * | 2014-12-12 | 2019-05-07 | Avantec Vascular Corporation | IVC filter retrieval systems with releasable capture feature |
| CN209734083U (en) * | 2018-02-10 | 2019-12-06 | 郑州大学第一附属医院 | A cerebrovascular transformable multifunctional inner stent loading recovery and release device |
| EP3903743B1 (en) * | 2018-12-28 | 2024-03-27 | Hangzhou Endonom Medtech Co., Ltd | Stent delivery device |
| CN112294508B (en) * | 2020-10-21 | 2025-06-24 | 江苏德恒医疗科技有限公司 | Vascular stent retriever |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102144940A (en) * | 2010-02-04 | 2011-08-10 | 微创医疗器械(上海)有限公司 | Conveying device |
| CN101933855A (en) * | 2010-08-26 | 2011-01-05 | 先健科技(深圳)有限公司 | A kind of recoverable vascular stent and recovery method thereof |
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