WO2007036100A1

WO2007036100A1 - Self-damaging syringe

Info

Publication number: WO2007036100A1
Application number: PCT/CN2006/001102
Authority: WO
Inventors: Dongsen Fang; Yi Li
Original assignee: Shandong Weigao Group Medical Polymer Co., Ltd
Priority date: 2005-09-28
Filing date: 2006-05-26
Publication date: 2007-04-05
Also published as: CN1939548A; CN100427157C

Abstract

A self-damaging syringe comprises a needle, a housing(2), a piston(3) and a plunger(4), the needle is mounted on the front end of the housing(2), the piston(3) is connnected to the front end of the plunger(4), a long groove(5) is axially provided on the plunger(4), a V-shaped elastical stopping block piece(6) is provided in the long groove(5), an outer elastical tongue(6-1) of the “V” shape elastical stopping block piece(6) is provided with two tips(6-2) and the tips puncture backwards into the inner wall of the housing, an inner elastical tongue(6-3) of the elastical stopping block piece(6) punctures backwards into a bottom face of the long groove of the plunger. The depth of the said long groove of the plunger is larger than the radius of the plunger.

Description

Self-destructing syringe

The present invention relates to a medical device, and more particularly to a self-destructing syringe. Background technique

We know that a syringe is a commonly used medical device. It generally includes a needle, a jacket, a piston, a push rod, and the like. In order to prevent cross-infection, one-time use has received more and more attention. However, the widely used disposable syringes are management concepts, and the performance is not "one-time". It can be used repeatedly, leaving hidden dangers for cross-infection and easily spreading diseases. In addition, during the subsequent treatment, most of the needles are exposed, which can easily scratch the doctor and patient, causing new cross infection. Patent 00205827. 8 discloses a self-destructing safety syringe, which consists of a syringe, a needle holder, a sealing ring, a rubber piston and a push rod. The front end of the barrel has a cylindrical hole, and the needle holder is slidably inserted into the cylindrical hole of the cylinder. Sealed by a sealing ring, the rear end of the needle holder is a puncture cone with a handle, which is easy to pierce the rubber piston film area at the end of the injection, and fits with the elastic collet at the front end of the plunger in the piston, and pulls the needle seat together with the injection needle In the syringe, this can achieve self-destruction in one-time use, but the structure is complicated, the assembly is difficult, the size of the components is strict, and the performance is not stable enough. The Chinese patent application ZL2004200410686 proposed by the applicant has a long groove in the axial direction on the core rod, and a "V" type elastic locking member is arranged in the long groove, and the two elastic tongues of the elastic locking member are respectively stabbed The inner wall of the outer casing and the bottom surface of the long rod of the core rod. However, the elastic locking member is not set properly, and the use process is easy to turn over, unstable and unreliable. Summary of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art described above, and to provide a self-destructing syringe which is simple in construction, convenient in use, stable, reliable in retracting performance, and good in safety performance.

The technical solution for solving the above technical problem is: a self-destructing syringe comprising an injection needle, a jacket, a piston and a core rod, wherein the injection needle is mounted on the front end of the jacket, and the piston is connected to the front end of the core rod, and the feature is: The core rod is provided with a long groove in the axial direction, and the long groove is provided with a "V" type elastic retaining card member, and the outer elastic tongue of the "V" type elastic retaining card member is provided with two spikes outwardly And piercing the inner wall of the jacket backwards, the elastic tongue of the elastic retaining clip is also provided with an everted spike and backward Pierce the bottom surface of the long groove of the core rod.

The depth of the core rod slot of the present invention is greater than the core rod radius. The outer elastic tongue of the "V" type elastic retaining clip is everted on both sides and has a concave surface in the middle. The elastic anti-return card in the long groove is stable and reliable, and does not reverse or deform.

In the elastic retaining clip of the present invention, the front portion of the inner elastic tongue is provided with an upward inclination angle of 2-5 degrees with respect to the bottom surface of the long groove, and the bottom portion of the rear opposite long groove is provided with a downward inclination angle of 6-16 degrees, and the core The bottom surface of the long groove of the rod forms two front and rear contact portions.

The jacket of the present invention is provided with a "V" type retaining clip member stably mounted on the long slot of the core rod, and the retaining clip member is reliably provided with an elastic tongue which is slanted toward the inner wall of the outer sleeve and the core rod, and when the core rod moves backward It does not displace relative to the outer casing. When the core rod is pushed forward, it moves forward in the outer casing and can only move forward in the outer casing under the driving of the core rod, and cannot retreat. After the injection work is completed, the piston is pushed to the innermost end, and the core rod drives the retaining clip to move to the front end of the outer sleeve, and the elastic tongue stabs toward the inner wall of the outer sleeve and the bottom surface of the long rod of the core rod, and the core rod, the piston, etc. cannot move forward, It can't be pulled backwards, so that the injection can only be self-destructed for one use, avoiding repeated use of the syringe. The invention has simple structure, convenient use, stability and good safety performance.

DRAWINGS

The invention will now be further described with reference to the drawings and embodiments.

Figure 1 is a schematic view of the structure of the present invention;

2 is a schematic structural view of a retaining card of the present invention;

Figure 3 is a plan view showing the planar expansion of the retaining card of the present invention;

Figure 4 is a schematic view of the direction A of Figure 2; Figure 1. Cone head, 2. Jacket, 3. Piston, 4. Core rod, 5. Long groove, 6. Retracting card, 6- 1. External elastic tongue, 6 - 2. Spiked, 6- 3. Internal elastic tongue.

detailed description

As can be seen from Figure 1, the present invention is a self-destructing syringe comprising a jacket 2, a piston 3, and a core rod 4. The front end of the outer sleeve 2 is provided with an integral cone 1 for mounting the injection needle, and a needle can be provided in addition to the injection needle. The piston 3 is connected to the front end of the core rod 4, and the piston 3 is a good elastic body. The shape of the front end is the same as the shape of the inner cavity of the outer casing 2 and the conical head 1, so that the amount of residual liquid injected can be effectively reduced. The above composition and structure of the present invention are substantially the same as those of the prior art, and will not be described again.

The invention is characterized in that: the core rod 4 is provided with a long groove 5 in the axial direction, and the long groove 5 is provided with a "V" type elastic retaining card member 6, and two elastics on the "V" type elastic retaining card member 6. The tongue piece, which has good elasticity, is supported in the long groove 5 and the outer casing 2 by elastic expansion. The outer elastic tongue 6-1 of the "V" type elastic retaining clip 6 is provided with two spikes 6-2 which are turned outwards and which are pierced backwards into the inner wall of the outer sleeve, and the inner elastic tongue of the elastic retaining clip 6_3 penetrates backward into the bottom surface of the long slot 5 of the core rod and stabs on the corresponding contact surface. As shown in Figure 1, Figure 2.

The depth of the core rod slot 5 of the present invention is greater than the core rod radius. The elastic retaining clip 6 is located in a deeper groove and has good stability without overturning or deformation.

The outer elastic tongue piece 6-1 of the "V" type elastic retaining clip member 6 of the present invention is everted on both sides, and has a concave surface in the middle, and the rear end is provided with two spikes 6_2 which are turned outward, and the spike 6-2 direction After piercing into the inner wall of the jacket. As shown in Figure 2, Figure 3, Figure 4. In this way, the two spikes 6-2, which are located on both sides, can be reliably penetrated into the inner wall of the jacket, and the turning and deformation will not occur during use.

The inner elastic tongue 6-3 of the elastic retaining clip 6 of the present invention is provided with a front portion opposite to the long groove bottom surface.

2-5 degrees of direction, up-tilt angle a, the bottom part of the rear side of the long groove is provided with a downward inclination angle b of 6-16 degrees, which forms two front and rear contact points with the bottom surface of the long groove of the core rod, so that the inner elasticity can be made The tongue piece 6-3 penetrates the bottom surface of the long groove of the core rod more reliably, and the force of piercing the bottom surface of the long groove of the core rod is sufficiently large to overcome the sliding of the outer elastic tongue piece 6-1 relative to the outer sleeve 2 when the forward movement is overcome. The friction force ensures that when the core rod is pushed forward, the elastic retaining clip 6 moves forward in the outer sleeve.

The outer casing 2 of the present invention is provided with a "V" type retaining clip 6 which is stably mounted on the long slot 5 of the core rod. The outer elastic tongue piece 6-1 on the retaining clip member 6 is always inclined backward on the inner wall of the outer sleeve. The inner elastic tongue 6-3 is slanted on the bottom surface of the long groove 5 and cannot be retracted. When the core rod moves backward, its outer sleeve does not shift. When the core rod is pushed forward, it moves forward in the outer sleeve and can only move forward in the sleeve under the driving of the core rod, and cannot be retracted. After the injection work is completed, the piston is pushed to the innermost end, and the core rod drives the retaining clip to move to the front end of the outer sleeve, and the elastic tongue stabs toward the inner wall of the outer sleeve and the bottom surface of the long rod of the core rod, and the core rod, the piston, etc. cannot move forward, Do not pull back, otherwise the core will be pulled off or the jacket will be cracked. This allows the syringe to be self-destructed for one use only, avoiding repeated use of the syringe.

The invention has simple structure, convenient use, stability and good safety performance.

Claims

Claim

A self-destructing syringe comprising an injection needle, a jacket, a piston, a core rod, an injection needle mounted on a front end of the sleeve, and a piston connected to the front end of the core rod, wherein: the core rod is provided with a long groove in the axial direction, The "V" type elastic retaining clips are arranged in the long groove, and the outer elastic tongues of the "V" type elastic retaining clips are provided with two spikes which are turned outwards, and are pierced backwards into the inner wall of the outer sleeve, and the elastic is stopped. The inner elastic tongue of the ejecting member is also provided with an everted tip and is pierced backwards into the bottom surface of the long groove of the core rod.

2. The self-destructing syringe of claim 1 wherein: the length of the core slot is greater than the core radius.

3. The self-destructing syringe according to claim 1, wherein: the outer elastic tongue of the "V" type elastic retaining clip is everted on both sides, and has a concave surface in the middle.

4. The self-destructing syringe according to claim 3, wherein: the front portion of the inner elastic tongue of the elastic retaining clip has an upward inclination angle of 2-5 degrees with respect to the bottom surface of the long groove, and the rear portion is relatively long. The bottom surface of the groove is provided with a downward inclination angle of 6-16 degrees, which forms two front and rear contact portions with the bottom surface of the long groove of the core rod.