CN116549873A - A carrier delivery system for loadable particles - Google Patents

Abstract

The invention discloses a carrier delivery system for loadable particles. The system includes an inner tube and an outer tube. The outer tube includes a proximal end opening, a distal end opening, and a first lumen extending from its proximal end opening to its distal end opening. The inner tube is slidably sleeved in the first inner cavity. A stent accommodating cavity for accommodating the collapsed particle-loaded stent is formed between the distal end section of the inner tube and the side wall of the first lumen. The system also includes an anchor and a stent recovery tube; the anchor is fixedly connected to the inner tube and is located in the stent accommodating cavity, and is used for connecting with the particle-loaded stent when the stent is recovered and with the particle-loaded stent when the stent is released. Separated from each other. The stent recovery tube is detachably connected to the distal end of the outer tube and communicates with the first lumen of the outer tube inside. When the outer tube moves toward the distal end of the inner tube, the stent recovery tube moves towards the expanded end of the particle-loaded stent and draws the corresponding section of the particle-loaded stent that passes through the stent recovery tube inward and then enters the first section of the outer tube. Inside the lumen.

Description

A carrier delivery system for loadable particles

technical field

The invention relates to the technical field of medical equipment, in particular to a particle-loadable stent delivery system used in a cavity.

Background technique

At present, stents have a wide range of applications and can be used to treat human biliary tract, portal vein, trachea, main bronchi, esophagus, intestinal tract and various organic strictures. In the prior art, the stent is usually loaded into the insertion tube of the conveyor by manual extrusion, and the stent is implanted into the lesion through a guide wire, bronchoscope, etc. to complete the release of the stent

For solid tumors in the cavity, the combination of I-125 radioactive particles and particle-loaded scaffolds is a new treatment method. During this implantation operation, the required dose needs to be calculated according to the TPS system, and the particles are loaded into the released particle-loaded stent according to the required dose, and then the loaded particle-loaded stent is recovered into the conveyor for waiting. Used intraoperatively. All the above steps are completed in the operating room of the hospital.

The traditional loadable particle rack conveyor does not have the function of recycling, and after the particles are loaded, the loaded particle rack in the released state is very thick and difficult to fit into the inserter. Moreover, the I-125 radioactive particles have certain radiation properties, and the surgeon faces the risk of being irradiated during the process of manually squeezing the stent back into the transporter.

Contents of the invention

Purpose of the invention: The technical problem to be solved by the present invention is to provide a particle-carrying stent delivery system for the deficiencies of the prior art, which facilitates recovery and release of the stent.

In order to solve the above-mentioned technical problems, the present invention discloses a particle-loadable stent delivery system. The delivery system includes an inner tube and an outer tube. The outer tube includes a proximal end opening, a distal end opening, and a first lumen extending from its proximal end opening to its distal end opening. The inner tube is slidably sleeved in the first lumen of the outer tube. A stent accommodating cavity for accommodating a particle-loaded stent in a collapsed state is formed between the distal end section of the inner tube and the first lumen side wall of the outer tube. The system also includes an anchor and a stent recovery tube, the anchor is affixed to the inner tube and located in the stent accommodating cavity, the anchor is used to interact with the loadable particles during the recovery process The proximal end of the stent is connected to and detached from the proximal end of the particle-laden stent during the release process. The stent recovery tube is detachably connected to the distal end of the outer tube and internally communicates with the first lumen of the outer tube. When the outer tube moves toward the distal end of the inner tube, the stent recovery tube moves toward the expanded end of the particle-laden stent and passes through the corresponding section of the particle-loaded stent through the stent recovery tube. After being folded inward, it enters the first inner cavity of the outer tube.

Specifically, the anchoring piece includes a collar and a plurality of anchor posts, the collar is fixedly sleeved on the inner tube, and the anchor posts are arranged on the sleeve at intervals along the circumferential direction of the collar. the proximal periphery of the ring. In the collar, the outer peripheral side wall located between two adjacent anchor columns is inwardly recessed to form a groove, and the groove penetrates through the collar axially, and is used for accommodating the particle-laden stent in a collapsed state. end of braided wire.

Specifically, the stent recovery tube is an elastic sleeve structure, including a horn-shaped compression section, an annular recovery section connected to the small mouth end of the horn-shaped compression section and communicating with the inside of the horn-shaped compression section, and passing through the Slits in the side walls of the bracket recovery tube. The annular recovering section penetrates into the distal end opening of the outer tube and is socketed with the outer tube, and the joint between the annular recovering section and the outer tube transitions smoothly.

Specifically, the system includes a guide head fixed to the distal end of the inner tube and a developing ring fixedly sleeved outside the inner tube, the guide head, the inner tube, the developing ring and the The side wall of the first lumen of the outer tube surrounds and forms the stent accommodating cavity.

Further, it also includes a middle pipe and a middle pipe fixing handle, and the middle pipe is sheathed between the outer pipe and the inner pipe. The distal end of the middle tube is fixedly connected to the developing ring, and the proximal end is fixedly connected to the fixing handle of the middle tube.

Further, it also includes a booster tube and an inner tube fixing handle, the booster tube is sheathed between the middle tube and the inner tube. The distal end of the booster tube extends into the outer tube.

Specifically, it also includes a locking device, the locking device is located between the distal end of the outer tube and the distal end of the inner tube, and is used to limit the axial distance between the inner tube and the outer tube. relatively sliding.

Specifically, the locking device includes a first locking connector and a second locking connector, the first locking connector is affixed to the proximal end of the outer tube, and the distal end of the inner tube is sequentially After penetrating through the second locking connector and the first locking connector, it extends into the first lumen of the outer tube. The second locking connector is rotatably sleeved on the outside of the inner tube. The first locking connection piece includes a locking portion and a first threaded connection portion sequentially in the radial direction, and the second locking connection piece includes an extruding portion matched with the locking portion and a The second threaded connection part matched with the threaded connection part, the second locking connection part is screwed with the first locking connection part through the first threaded connection part and the second threaded connection part, and the extruding part is used In the process of tightening the connection, the locking part is squeezed inwards to gather and hold the inner tube tightly.

Specifically, the first locking connector includes a movable handle and a locking clip, and the locking clip is affixed to the movable handle so as to realize the fastening of the first locking connector to the outer tube. catch. The locking part is a proximal section of the locking clip, and the first threaded connection part is an internal thread section provided at the proximal end of the movable handle. The second locking connector is a locking ferrule, the second threaded connection part is an external thread section arranged at the distal end of the locking ferrule, and the extruding part is arranged on the locking ferrule The inclined surface on the inner peripheral side wall of the distal end of the sleeve and inclined inward toward the proximal end, during the screwing process, the inclined surface presses against the proximal end of the locking clip and draws inward to tightly hold the inner tube.

Specifically, the guide head is provided with a guide hole. The inner tube includes a proximal end opening, a distal end opening, and a second lumen extending from its proximal end opening to its distal end opening. The guide hole of the guide head communicates with the second inner cavity to form a guide wire channel.

Beneficial effect:

(1) In the particle-loaded stent delivery system provided by the present application, by setting an anchor piece and a stent recovery tube, the anchor piece is fixedly connected to the inner tube and is located in the stent accommodating cavity, and the can The particle-loaded stent is detachably connected to the anchor and communicates internally with the distal end opening of the outer tube. In the process of recovering the stent, when the outer tube moves toward the distal end of the inner tube, the outer tube drives the stent recovery tube to move towards the expanded end of the particle-loaded stent, and the stent recovery tube guides the particle-loaded stent through the The corresponding section of the stent recovery tube is folded inward and enters the first lumen of the outer tube. After the outer tube moves far to a certain distance relative to the inner tube, the particle-laden stent can be completely folded and recovered in the stent accommodating cavity. During the process of releasing the stent into the body, when the outer tube moves toward the proximal end of the inner tube for a certain distance, the particle-loaded stent can be completely and naturally released and separated from the anchor. Thus, the particle-loaded stent delivery system provided by the present application realizes the functions of releasing and recovering the stent.

(2) Compared with the prior art where the stent loaded with particles is folded and pushed into the stent accommodating cavity segment by segment by manual extrusion, the present application uses anchors to hang the proximal end of the particle-loaded stent and make it This section is in a folded state. When the outer tube moves towards the distal end of the inner tube, the stent recovery tube moves towards the expanded end of the particle-loaded stent. Under the guidance, it is continuously and smoothly folded inward, and the process of recovering the particle-loaded stent is more convenient and faster, which can improve the efficiency of the operation and save the operation time. At the same time, since the operator does not need to manually squeeze the particle-carrying bracket section by section during the recovery process, the application helps to reduce the radiation risk of radioactive particles to the operator.

(3) The bracket recovery tube used in one embodiment of the present application includes a horn-shaped compression section, an annular recovery section connected to the small mouth end of the horn-shaped compression section and communicated with the inside of the horn-shaped compression section, and a wall that runs through the side wall of the bracket recovery tube. Slit. Since the inner diameter of the trumpet-shaped compression section gradually decreases, it guides the corresponding section of the loadable particle stent passing through the stent recovery tube inwardly, so that the corresponding section of the loadable particle stent passing through the stent recovery tube is Under the guidance of the trumpet-shaped compression section, it gathers inward continuously and smoothly. By setting the annular recovery section at the small mouth section of the horn-shaped compression section and setting the slit through the side wall of the bracket recovery tube, the bracket recovery tube forms an elastic sleeve structure, and the annular recovery section is separated from the distal end of the outer tube. The opening is inserted into the outer tube, and the annular recovery section forms a tight contact connection with the outer tube. This detachable connection method is simple in structure and easy to operate.

(4) This application is applicable to both stents loaded with radioactive particles and common self-expandable stents without particles.

Description of drawings

The advantages of the above and/or other aspects of the present invention will become clearer as the present invention will be further described in detail in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of the external structure of a particle-loadable stent delivery system provided by an embodiment of the present invention;

Fig. 2 is a sectional view along the line A-A in Fig. 1;

Fig. 3 is a partial enlarged view of area B shown in Fig. 2;

Fig. 4 is a schematic structural view of a particle-loaded stent in an expanded state provided by an embodiment of the present invention;

Fig. 5 is a schematic structural view of a particle-loaded stent anchored in a particle-loaded stent delivery system according to an embodiment of the present invention;

Fig. 6 is a sectional view along the line D-D in Fig. 5;

Fig. 7 is a partial enlarged view of the E region shown in Fig. 5;

Fig. 8 is a schematic structural view of a particle-loadable stent completely folded in a particle-loadable stent delivery system according to an embodiment of the present invention;

Fig. 9 is a partial enlarged view of the F area shown in Fig. 8;

Fig. 10 is a schematic structural diagram of an anchor provided by an embodiment of the present invention;

Fig. 11 is a schematic structural view of a particle-loaded scaffold anchored to the anchor shown in Fig. 10 according to an embodiment of the present invention;

Fig. 12 is a schematic structural view of a stent recovery tube provided by an embodiment of the present invention;

Fig. 13 is a partial enlarged view of area C shown in Fig. 1;

Fig. 14 is a schematic diagram of loading radioactive particles into the particle-loadable rack shown in Fig. 5 according to an embodiment of the present invention.

Reference numerals are as follows: delivery system 100, inner tube 101, outer tube 102, proximal end opening 103, distal end opening 104, first lumen 105, stent receiving lumen 106, anchor 107, stent Recovery tube 108, collar 109, anchor post 110, groove 111, guide head 112, developing ring 113, middle tube 114, middle tube fixing handle 115, booster tube 116, inner tube fixing handle 117, locking device 118 , the first locking connection part 119, the second locking connection part 120, the locking part 121, the first threaded connection part 122, the extrusion part 123, the second threaded connection part 124, the movable handle 125, the locking clip 126 , the guide hole 127, the second inner cavity 128, the trumpet-shaped compression section 129, the annular recovery section 130, the slot 131, the particle-carrying bracket 200, and the particle implanter 300.

Detailed ways

The technical solution of the present application will be described in detail below in conjunction with the accompanying drawings.

As shown in FIG. 1 and FIG. 2 , the present application provides a particle-loaded stent delivery system for recovering and implanting a particle-loaded stent 200 . The particle-loaded stent 200 has the property of self-expansion, and can be squeezed to a collapsed state by external pressure, and then self-expanded and released after the external force is removed. The delivery system 100 includes an inner tube 101 and an outer tube 102 . The outer tube 102 includes a proximal end opening 103 , a distal end opening 104 and a first lumen 105 extending from its proximal end opening 103 and its distal end opening 104 . As shown in FIGS. 2 and 3 , the inner tube 101 is slidably sleeved in the first lumen 105 of the outer tube 102 . A stent accommodating cavity 106 for accommodating the particle-loaded stent 200 in a collapsed state is formed between the distal section of the inner tube 101 and the side wall of the first inner cavity 105 of the outer tube 102 . Specifically, as shown in FIG. 3 , the system includes a guide head 112 affixed to the distal end of the inner tube 101 and a developing ring 113 fixedly sleeved on the outside of the inner tube 101. The guide head 112, The inner tube 101 , the developing ring 113 , and the sidewall of the first inner cavity 105 of the outer tube 102 enclose the bracket receiving cavity 106 .

As shown in FIG. 4 , in the prior art, the particle-loaded scaffold 200 is loaded when it is in an expanded state. Before and during the implantation operation, the operator needs to push the stent loaded with radioactive particles into the stent accommodating cavity 106 segment by segment by manually squeezing. This method not only has radiation risks, but also has low efficiency, which leads to prolonged intraoperative time.

In order to facilitate recovery of the particle-loaded stent 200 into the stent accommodating chamber 106, as shown in Figure 5 and Figure 6, the system also includes an anchor 107 and a stent recovery tube 108, the anchor 107 is connected to the inner tube 101 Fixed and located in the stent containing cavity 106, the anchor 107 is used to connect with the proximal end of the particle-loaded stent 200 during the recovery process, and connect with the particle-loaded stent 200 during the release process. The proximal phase is detached. As shown in Figure 7, the inner diameter of the stent recovery tube 108 gradually becomes smaller. When in use, the stent recovery tube 108 is sleeved on the outside of the inner tube 101, and the small-diameter end of the stent recovery tube 108 is in contact with the The distal end of the outer tube 102 is detachably connected and the inside of the stent recovery tube 108 communicates with the first lumen 105 of the outer tube 102 .

The working process of recovering and releasing the stent using a particle-loaded stent delivery system provided by the present application is as follows:

Before recovering the stent, the stent recovery tube is installed on the distal end of the outer tube, and the distal end of the outer tube 102 is positioned at the proximal end of the distal end of the inner tube 101 so that the stent receiving chamber 106 is open. The particle-loaded stent 200 to be recovered in an expanded state is sheathed on the outside of the stent-accommodating cavity 106, and its proximal end is drawn inward and then anchored to the anchor 107, so that the particle-loaded stent The proximal end of 200 is connected to the inner tube 101 .

When recovering the stent, when the outer tube 102 moves to the distal end relative to the inner tube 101, the stent recovery tube 108 moves toward the expanded end of the particle-loaded stent 200 and makes the particle-loaded stent 200 The corresponding part passing through the stent recovery tube 108 is folded inward and enters the first inner cavity 105 of the outer tube 102 . After the outer tube 102 moves to the distal end relative to the inner tube 101 for a certain distance, the particle-loaded stent 200 can be completely folded and recovered in the stent accommodation chamber 106, as shown in FIGS. 8 and 9 . After the stent is retrieved, the stent retriever can be removed from the delivery system before implanting the stent into the body.

When the stent is released, when the outer tube 102 moves toward the proximal end of the inner tube 101 until the stent accommodating cavity 106 is in an open state, the particle-loaded stent 200 naturally expands and connects with the anchor 107 Separated from each other.

Specifically, as shown in FIG. 10 , the anchor 107 includes a collar 109 and several anchor posts 110 . The collar 109 is fixedly sleeved on the inner tube 101 . The anchor posts 110 are disposed on the outer periphery of the proximal end of the collar 109 at intervals along the circumferential direction of the collar 109 . A groove 111 is formed on the outer peripheral sidewall of the collar 109 between two adjacent anchor posts 110 , and the groove 111 penetrates through the collar 109 in the axial direction. As shown in FIG. 11 , when recovering the stent, the proximal braided wire of the particle-loaded stent 200 is hung on the anchor post 110 and the proximal braided wire of the particle-loaded stent 200 in the collapsed state is located at the corresponding In the groove 111.

Specifically, as shown in FIG. 12 , the bracket recovery pipe 108 is an elastic sleeve structure, which can be made of plastic materials such as PP, PET, or stainless steel. The stent recovery pipe 108 includes a horn-shaped compression section 129, an annular recovery section 130 connected to the small mouth end of the horn-shaped compression section 129 and communicated with the inside of the horn-shaped compression section 129, and a ring that runs through the stent recovery tube 108. The slit 131 of the side wall. The annular recovery section 130 penetrates into the distal end opening of the outer tube 102 and is socketed with the outer tube 102 , and the connection between the annular recovery section 130 and the outer tube 102 transitions smoothly.

As shown in FIG. 2 , the guide head 112 is connected to the inner tube 101 and forms a guide wire channel. A guide wire is passed through the guide wire channel to guide the conveyor to the lesion site.

Specifically, the guide head 11 is made of a polymer material with an elastic body function, and is arranged in a tapered shape as a whole. The guide head 112 defines a guide hole 127 . The inner tube 101 includes a proximal end opening 103 , a distal end opening 104 and a second lumen 128 extending from its proximal end opening 103 to its distal end opening 104 . The guide hole 127 communicates with the second lumen 128 to form a guide wire channel.

As shown in Figure 2, the system also includes a middle tube 114 and a fixed handle 115 for the middle tube. The middle tube 114 is sleeved between the outer tube 102 and the inner tube 101 to support the outer tube 102 and raise the The effect of conveyor bending. The distal end of the middle tube 114 is fixedly connected to the developing ring 113 , and the proximal end is fixedly connected to the middle tube fixing handle 115 .

As shown in Figure 2, the system also includes a booster tube 116 and an inner tube fixing handle 117, the booster tube 116 is sleeved between the middle tube 114 and the inner tube 101 to increase the strength of the pushing end role. The distal end of the booster tube 116 extends into the outer tube 102 .

As shown in FIG. 13 , in order to load the radioactive particles into the particle-loaded stent and implant the delivery system into the body, the system further includes a locking device 118 located on the outer tube 102 Between the distal end of the inner tube 101 and the distal end of the inner tube 101, it is used to limit the relative sliding between the inner tube 101 and the outer tube 102 in the axial direction, so as to ensure that the delivery system can carry particles during the process of introducing the delivery system into the body. The bracket is stably accommodated in the bracket receiving chamber 106 . In one embodiment, as shown in FIG. 12 , the locking device 118 includes a first locking connector 119 and a second locking connector 120 , the first locking connector 119 is connected to the outer tube 102 The proximal end of the inner tube 101 is affixed, and the distal end of the inner tube 101 passes through the second locking connector 120 and the first locking connector 119 in turn, and then extends into the first inner cavity 105 of the outer tube 102 The second locking connector 120 is rotatably sleeved on the outside of the inner tube 101; the first locking connector 119 sequentially includes a locking portion 121 and a first threaded connection portion 122 in the radial direction, The second locking connector 120 includes an extrusion part 123 matched with the locking part 121 and a second threaded part 124 matched with the first threaded part 122, the second locking The connecting piece 120 is screwed to the first locking connecting piece 119 through the first threaded connection part 122 and the second threaded connection part 124, and the extrusion part 123 is used to squeeze the lock during the screw connection process. The tight portion 121 is drawn inwards to hug the inner tube 101 tightly. In a specific embodiment, as shown in FIG. 13 , the first locking connector 119 includes a movable handle 125 and a locking clip 126, and the locking clip 126 is affixed to the movable handle 125, so as to Realize that the first locking connector 119 is firmly connected to the outer tube 102; the locking part 121 is the proximal end section of the locking clip 126, and the first threaded connection part 122 is arranged on the outer tube 102. The internal thread segment at the proximal end of the movable handle 125; the second locking connector 120 is a locking ferrule, and the second threaded connection part 124 is an external thread segment arranged at the far end of the locking ferrule, The extrusion part 123 is an inclined surface arranged on the inner peripheral side wall of the distal end of the locking ferrule and inclined inward toward the proximal end, when the distal end of the locking ferrule is inserted into the cavity When rotating and moving toward the distal end, the inclined surface presses against the proximal end of the locking clip 126 and draws inwards to hug the inner tube 101 tightly.

The process of recovering and releasing the stent using a particle-loaded stent delivery system of the present application is as follows:

Step 1, as shown in FIG. 7 , the stent recovery tube 108 is installed on the distal end of the outer tube 102, and the distal end of the outer tube 102 is positioned at the proximal end of the distal end of the inner tube 101 so that Make the stent accommodating chamber 106 in an open state.

Step 2, anchoring the stent: as shown in FIG. 6 , the unloaded particle-loaded stent 200 in the expanded state is sleeved on the outside of the stent-accommodating cavity 106, and the proximal end of the particle-loaded stent 200 is braided with wire Hang on the anchor 107. At this time, the proximal section of the particle-loaded stent 200 is in a trumpet-shaped network structure, while other parts of the particle-loaded stent 200 are in an expanded state.

Step 3, pre-positioning: make the outer tube 102 move toward the distal end of the inner tube 101 until the particle compartment on the loadable particle rack 200 is located outside the distal end of the outer tube 102, during this process , the stent recovery tube 108 moves toward one end of the particle-loaded stent 200 in an expanded state, and the corresponding part of the particle-loaded stent 200 passing through the stent recovery tube 108 is folded inward and enters the outer tube 102 Inside the first lumen 105 of the

Step 4. Loading the rack: as shown in FIG. 14 , the radioactive particles are loaded into the particle compartment on the particle-loadable rack 200 by using the particle implanter 300 .

Step 5, recovering the stent: moving the outer tube 102 toward the distal end of the inner tube 101 until the particle-loaded stent 200 is in a fully collapsed state and accommodated in the stent accommodating cavity 106, as shown in FIG. 10 . After recovering the stent and before implanting the stent into the body, the stent recovery tube 108 is removed from the delivery system 100 .

Step 6. Release the stent: move the outer tube 102 toward the proximal end of the inner tube 101 until the circumferential direction of the stent accommodating cavity 106 is completely open. During this process, the particle-loaded stent 200 is and the proximal end gradually and naturally release, and finally the proximal end of the particle-loaded stent 200 is detached from the anchor 107, thereby realizing the release of the particle-loaded stent 200 to the implantation area.

Compared with the recovery process in the prior art that firstly loads particles on the loadable particle holder in the released state, and then manually squeezes the loaded particle holder into the interior of the outer tube after being folded up section by section In the recovery process of the present application, there is no link that requires the operator to directly contact the bracket loaded with radioactive particles, so the present application helps to reduce the radiation risk of radioactive particles to the operator. At the same time, in this application, due to the setting of the support recovery tube, the corresponding section of the loadable particle support that passes through the support recovery tube is continuously and smoothly folded inward under the guidance of the support recovery tube, and the process of recovering the loadable particle support is similar. Compared with the process of manual extrusion segment by segment in the prior art, it is more convenient and faster, can improve the efficiency and safety of the operation, and save the operation time.

Compared with the prior art where the stent loaded with radioactive particles is manually squeezed into the implanter, the particle-loaded stent delivery system provided by the present application is more convenient for recovering and releasing the stent, and reduces the operating time. risk of exposure to radiation.

The present invention provides an idea and method of a particle-carrying stent delivery system. There are many methods and approaches to realize this technical solution. The above description is only a preferred embodiment of the present invention. As far as people are concerned, some improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. All components that are not specified in this embodiment can be realized by existing technologies.

Claims (10)

1. A particle-loadable stent delivery system, characterized in that, the delivery system (100) includes an inner tube (101) and an outer tube (102); the outer tube (102) includes a proximal end opening (103) , a distal end opening (104) and a first lumen (105) extending from its proximal end opening (103) to its distal end opening (104); the inner tube (101) is slidably Sleeved in the first lumen (105) of the outer tube (102); a useful The support cavity (106) is used to accommodate the particle-loaded support (200) in a collapsed state; the system also includes an anchor (107) and a support recovery tube (108), and the anchor (107) is connected to the The inner tube (101) is fixed and located in the stent accommodating cavity (106), and the anchor (107) is used for connecting with the proximal end of the particle-loaded stent (200) during recovery and During the release process, it is separated from the proximal end of the particle-loaded stent (200); the stent recovery tube (108) is detachably connected to the distal end of the outer tube (102) and internally connected to the outer tube ( 102) communicates with the first lumen (105); when the outer tube (102) moves toward the distal end of the inner tube (101), the stent recovery tube (108) moves toward the particle-loaded stent (200 ) in the expanded state moves and makes the corresponding section of the particle-loaded stent (200) passing through the stent recovery tube (108) fold inward and then enter the first lumen (105) of the outer tube (102) Inside. 2. A kind of particle-loadable stent delivery system according to claim 1, characterized in that, the anchor (107) comprises a collar (109) and several anchor posts (110), the collar (109) 109) fixedly sleeved on the inner tube (101), and the anchor posts (110) are arranged on the proximal outer circumference of the collar (109) at intervals along the circumferential direction of the collar (109); In the collar (109), the outer peripheral side wall between two adjacent anchor columns (110) is inwardly recessed to form a groove (111), and the groove (111) is formed along the axial direction of the collar (109). Through, used for accommodating the braided wire at the proximal end of the particle-loaded stent (200) in a collapsed state. 3. A kind of loadable particle support delivery system according to claim 2, characterized in that, the support recovery pipe (108) is an elastic sleeve structure, comprising a horn-shaped compression section (129), and the horn-shaped The small mouth end of the compression section (129) is connected to the annular recovery section (130) that communicates with the horn-shaped compression section (129) and the slit (131) that runs through the side wall of the bracket recovery pipe (108); The annular recovery section (130) penetrates into the distal end opening (104) of the outer tube (102) and is socketed with the outer tube (102), and the annular recovery section (130) is connected to the outer tube (102). The junction of the outer tube (102) has a smooth transition. 4. A particle-loadable stent delivery system according to claim 3, characterized in that the system comprises a guide head (112) affixed to the distal end of the inner tube (101) and a fixed sleeve The developing ring (113) outside the inner tube (101), the guide head (112), the inner tube (101), the developing ring (113) and the first inner part of the outer tube (102) The side wall of the cavity (105) encloses and forms the bracket accommodating cavity (106). 5. A kind of particle-loadable stent delivery system according to claim 4, characterized in that, it also includes a middle tube (114) and a middle tube fixing handle (115), and the middle tube (114) is sleeved on the between the outer tube (102) and the inner tube (101); the distal end of the middle tube (114) is affixed to the developing ring (113), and the proximal end is fixed to the middle tube with a handle (115) is fixedly connected. 6. A particle-loadable stent delivery system according to claim 5, characterized in that, it also comprises a booster tube (116) and an inner tube fixing handle (117), and the booster tube (116) is sleeved on Between the middle tube (114) and the inner tube (101); the distal end of the booster tube (116) extends into the outer tube (102). 7. A particle-loadable stent delivery system according to claims 1 to 6, further comprising a locking device (118), the locking device (118) being located at the outer tube (102) The distance between the distal end and the distal end of the inner tube (101) is used to limit relative sliding between the inner tube (101) and the outer tube (102) in the axial direction. 8. A particle-loadable stent delivery system according to claim 7, characterized in that, the locking device (118) comprises a first locking connector (119) and a second locking connector (120) , the first locking connector (119) is affixed to the proximal end of the outer tube (102), and the distal end of the inner tube (101) passes through the second locking connector (120), The first locking connector (119) extends into the first inner cavity (105) of the outer tube (102); the second locking connector (120) is rotatably sleeved on the The outside of the inner tube (101); the first locking connector (119) sequentially includes a locking portion (121) and a first threaded connection portion (122) in the radial direction, and the second locking connector (120 ) includes an extruding portion (123) matched with the locking portion (121) and a second threaded connection portion (124) matched with the first threaded connection portion (122), the second locking The connecting piece (120) is screwed with the first locking connecting piece (119) through the first threaded connection part (122) and the second threaded connection part (124), and the extrusion part (123) is used for screwing During the tight connection process, the locking part (121) is squeezed inwardly to hug the inner tube (101). 9. A particle-loadable stent delivery system according to claim 8, characterized in that, the first locking connector (119) includes a movable handle (125) and a locking clip (126), the The locking clip (126) is fixedly connected with the movable handle (125), so as to realize the fixed connection between the first locking connecting piece (119) and the outer tube (102); the locking part (121) It is the proximal section of the locking clip (126), the first threaded connection part (122) is an internal thread section arranged at the proximal end of the movable handle (125); the second locking connection part (120) is a locking ferrule, the second threaded connection part (124) is an external thread section arranged at the distal end of the locking ferrule, and the extrusion part (123) is arranged on the locking ferrule The inclined surface on the inner peripheral side wall of the distal end of the ferrule is inclined inward towards the proximal end. During the screwing process, the inclined surface presses against the proximal end of the locking clip (126) and draws inward Hold the inner tube (101) tight. 10. A particle-loadable stent delivery system according to claim 9, characterized in that, the guide head (112) is provided with a guide hole (127); the inner tube (101) includes a proximal end Opening (103), distal end opening (104) and a second lumen (128) extending from its proximal end opening (103) to its distal end opening (104); the guide head ( The guide hole (127) of 112) communicates with the second lumen (128) to form a guide wire channel.