WO2013159255A1

WO2013159255A1 - Retractable-type safe self-locking-type self-destructing syringe

Info

Publication number: WO2013159255A1
Application number: PCT/CN2012/000742
Authority: WO
Inventors: 张林锋
Original assignee: Zhang Linfeng
Priority date: 2012-04-27
Filing date: 2012-05-28
Publication date: 2013-10-31
Also published as: CN103372250A; CN103372250B

Abstract

A retractable-type safe self-locking-type self-destructing syringe, which comprises a syringe barrel body (6). A plunger (7) is arranged in the syringe barrel body (6). A needle base is arranged in a barrel neck at an end part of the syringe barrel body (6). A sealing ring (3) is sleeved on the outer wall of the needle base. A head part for needle replacement is formed by the upper part of the needle base. A flexible support engaging piece (4) is arranged within a cavity at the lower part of the needle base. A locking-clutching mechanism matching the end part of the plunger (7) is arranged within the flexible support engaging piece (4). The locking-clutching mechanism is provided with a flexible characteristic. Also, a flexible support limiting mechanism matching the inner wall of the cavity of the syringe barrel body (6) is formed by the exterior of the flexible support engaging piece (4). A clutching part matching the locking-clutching mechanism is formed by the end part of the plunger (7).

Description

Pull-back safety self-locking self-destructing syringe

Technical field

The invention relates to the technical field of medical instruments, in particular to a pull-back type self-locking self-destructing syringe, in particular to a mechanical connecting structure thereof.

Recitation technique

Comparative Document 1, Patent Application No.: 200910029167. X, Applicant: Zhou Ligang, Application Date: 2009. 1. 7, Publication No.: CN101474443A, This case discloses a safe self-destructing medical syringe with a movable needle seat and a jacket. There is a convex portion and a clamping platform which are overlapped with each other, and the movable needle seat is provided with a hook extending into the injection liquid storage cavity body, and the sealing plug is provided with a tightening inclined surface of the hook, and the deflection slope is provided below the inclined inclined surface The axis of the deflecting hole is inclined with the axis of the outer sleeve, and the sealing plug is provided with a fastening cavity for connecting the sealing plug and the hook, and the outer tube of the outer side of the hook is larger than the outer diameter of the movable needle seat. , hook the jacket on the other side to constrain the movable needle seat.

Comparative Document 2, Patent Application No.: 200610049044. 9, Applicant: Lin Zuoqian, Application Date: 2006. 1. 12, Publication No.: CN1803212A, This case discloses a safe self-destructing medical syringe with two lower cones. a through-groove symmetrically distributed with respect to the central axis, and two bosses symmetrically distributed with respect to the central axis are formed in the middle of the two-way groove, the boss is engaged with the corresponding groove on the syringe, and a bottom is formed on the bottom of the inner hole of the cone a groove; a front end of the support base is provided with a plurality of elastic claws engageable with the boss of the core head, and a flange is disposed at the outer middle portion.

At present, there are many types of self-destructing syringes, and there are many safety syringes. However, the design of the parts is complicated, the processing is difficult, the assembly is not easy, and the cost is high; the needle-retracting resistance of the needle tip is not Enough, the tip of the needle is easy to retract into the outer casing, causing the liquid to leak out, or deliberately increasing the resistance of the retraction but increasing the resistance to the pullback, which also causes inconvenience to the user; The force required to destroy the device is large, which may cause the syringe to be shaken and cause pain to the patient; the anti-traffic thrust preventing member needs to be operated by both hands, and the thrust member of the underarm is also collected. Therefore, it is necessary to improve the existing safety self-locking syringes, reduce the production and assembly costs of related parts, and reduce the pull-back resistance while increasing the withdrawal resistance, while ensuring that the needle holder does not rotate, triggering self-destruction. When the device is not shaken, the needle tip must be self-locked in the inner cavity of the jacket, and a one-handed protective sheet is provided to prevent misoperation during transportation and handling, thereby achieving mass production and clinical safety applications.

Summary of the invention

The object of the present invention is to provide a pull-back type safety self-locking self-destructing syringe. The needle seat and the outer sleeve of the structure syringe can be assembled at an arbitrary angle, the needle seat is simple and efficient to form, and the needle withdrawal resistance is large, and the self-locking device has low cost. . At the same time, the needle of the syringe is fixed firmly by the toothed sleeve, preventing rotation, the force required to trigger the self-destructing device is small, the needle cylinder is not shaken, the injection can be made safer and more reliable, and the syringe barrel is added to the core rod portion. The body-fitted locking mechanism effectively prevents the needle from being pushed out twice, and truly realizes the safe operation of the syringe, overcoming the shortcomings and deficiencies in the prior art.

In order to achieve the above object, the technical solution of the present invention is: a pull-back type self-locking self-destructing syringe, which comprises a syringe barrel, a core rod is arranged in the syringe barrel, and a plunger is sleeved near the end of the core rod, the syringe a needle seat is arranged in the neck of the end of the barrel, and the outer wall of the needle seat is sleeved with a sealing ring, wherein: the upper part of the needle seat forms a replaceable needle head, and the lower cavity of the needle seat is provided with an elastic support card. The elastic support clip is provided with the end of the core rod a locking engagement mechanism having a resilient characteristic, the elastic support member forming an elastic support limiting mechanism externally matched with the inner wall of the inner cavity of the syringe barrel, the end of the core rod forming a snap fit with the locking engagement mechanism unit.

Another technical solution of the present invention is: a pull-back type self-locking self-destructing syringe, which comprises a syringe barrel, a core rod is arranged in the syringe barrel, and a plunger is sleeved near the end of the core rod, and the end of the syringe barrel The needle neck is provided with a needle seat, and the outer wall of the needle seat is sleeved with a sealing ring, wherein the lower cavity of the needle seat is provided with an elastic supporting card member, and the elastic supporting card member is provided with the end portion of the core rod a locking locking mechanism, the locking and occluding mechanism has an elastic characteristic, the elastic supporting card member externally forms an elastic support limiting mechanism that cooperates with the inner wall of the inner cavity of the syringe barrel, and the end of the core rod forms a nip portion that cooperates with the locking and occluding mechanism .

The invention discloses a pull-back safety self-locking self-destructing syringe, which has the beneficial effects that: the needle seat and the outer sleeve can be directly embedded and assembled in any direction in the whole circumference; the needle withdrawal force acts on the hub cone seat, the limit of the claw The position function can provide a large anti-needle resistance in the positive direction; when the pull back, the jaws only need to be deformed to reduce the pull-back resistance in the reverse direction; the elastic support clip and the end of the core rod cooperate with the locking and occlusion mechanism, and have the elastic characteristic During the clinical injection, the process of the end of the core rod entering the locking and occluding mechanism is not felt. After the end of the core rod enters, the locking and occluding mechanism loses the inward elastic property, and the pull-back engagement can be realized. The self-locking structure of the core rod and the outer sleeve is simple and easy to manufacture, but the self-locking function can be achieved, which effectively improves the safe operation performance of the product. The overall design of the syringe is reasonable and the working condition is stable. Compared with the prior art, it has outstanding substantive features and significant progress.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view showing a planar structure of a first embodiment of the present invention. Figure 2 is a perspective view showing the three-dimensional structure of the syringe barrel.

Figure 3 is a cross-sectional view of the core rod structure.

Figure 4 is a schematic view of the three-dimensional structure of the hub cone.

Figure 5 is a cross-sectional view showing the planar structure of the hub cone.

Figure 6 is a schematic perspective view of the elastic support card.

Figure 7 is a plan sectional view showing the liquid absorbing state of the first embodiment.

Fig. 8 is a plan sectional view showing the state of liquid pushing in the first embodiment.

Figure 9 is a cross-sectional view showing the planar structure of the first embodiment in an injection state.

Fig. 10 is a plan sectional view showing the state in which the claw of the first embodiment is disengaged from the retaining groove; Figure 11 is a cross-sectional view showing the self-locking state of the core rod of the first embodiment.

Figure 12 is a cross-sectional view showing a planar structure of a second embodiment of the present invention.

Figure 13 is a plan sectional view showing the state of liquid absorption of the second embodiment.

Figure 14 is a plan sectional view showing the state of liquid pushing in the second embodiment.

Figure 15 is a cross-sectional view showing the planar structure of the second embodiment in an injection state.

Fig. 16 is a plan sectional view showing the state in which the claw of the second embodiment is disengaged from the retaining groove; Figure 17 is a cross-sectional view showing the self-locking state of the core rod of the second embodiment.

Figure 18 is a cross-sectional view of the needle hub of the second embodiment of the syringe.

detailed description

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

The invention is a pull-back type safety self-locking self-destructing syringe, which comprises a syringe barrel 6, a syringe rod 6 is arranged in the syringe barrel 6, and a plunger 5 is sleeved near the end of the core rod 7, the syringe barrel There is a needle seat in the neck of the 6 end, and the outer wall of the needle seat is sleeved with a sealing ring 3, and the area thereof Different from the prior art, the upper part of the needle seat forms a replaceable needle head, and the lower cavity of the needle seat is provided with an elastic support card member 4, and the elastic support card member 4 is provided with a lock corresponding to the end of the core rod. a locking mechanism, the locking and occluding mechanism has an elastic characteristic, the elastic supporting clip 4 externally forms an elastic supporting limiting mechanism matched with the inner wall of the inner cavity of the syringe barrel 6, and the end of the core rod forms a nip portion matched with the locking and occluding mechanism .

Another embodiment of the present invention is: a pull-back type self-locking self-destructing syringe, comprising a syringe barrel 6; a syringe barrel 6 is provided with a core rod 7, and a core rod 7 is sleeved with a piston 5 near the end. The needle neck of the end of the syringe barrel 6 is provided with a needle seat, and the outer wall of the needle seat is sleeved with a sealing ring 3, which is different from the prior art in that: the lower cavity of the needle seat is provided with an elastic supporting card member 4, The elastic supporting clip 4 is provided with a locking and engaging mechanism which cooperates with the end of the core rod. The locking and engaging mechanism has an elastic characteristic, and the elastic supporting clip 4 externally forms an elastic supporting limit for cooperating with the inner wall of the inner cavity of the syringe barrel 6. The position mechanism, the end of the core rod forms a nip portion that cooperates with the locking engagement mechanism.

In a specific implementation, the replaceable needle head is a cone 2 with a guiding hub, and the screw of the cone 2 of the guiding hub can cooperate with the 6:100 international standard injection needle 1.

In an embodiment, the inner wall of the lower cavity of the needle seat forms an annular inner groove 22, and the outer wall of the needle seat is provided with an annular outer groove 23, and the sealing ring 3 is disposed in the annular outer groove 23. Ensure the seal between the needle seat and the inner wall of the barrel.

In a specific implementation, the outer wall of the cone 2 of the guiding hub has an annularly evenly distributed bearing hub 21 with a guiding function, which ensures that the hub cone can be accurately assembled into the syringe barrel in any direction. In vivo, thus enabling fully automated production at a very low cost during assembly. In a specific implementation, the elastic supporting clip 4 has an approximately hollow cylindrical shape, and two elastically deformable elastic deformation fins 45 are formed on the upper portion of the elastic supporting clip 4, and the upper outer edge of the elastic deformation fin 45 is formed with an annular inner groove. A 22-fitted annular flange 41 forms a notch 44 between the two elastically deformable fins 45. The upper surface of the elastic supporting clip 4 at the lower portion of the notch 44 forms two symmetrical arc-shaped platforms 47, two curved platforms. Each of the 47 portions is provided with a pawl piece 43. The two pieces of the pawl piece 43 are symmetrical with each other, and the extension lines of the upper ends of the two pieces of the pawl piece 43 form an angle, and the inner side of the pawl piece 43 expands outward when subjected to a force, and has an elastic characteristic. A gap 46 is formed between the two sides of the pawl piece 43 and the inner side of the elastic deformation piece 45. The lower part of the elastic support card 4 is provided with a circular card 48, and the circular card 48 is provided with a plurality of cutting gaps 481. When implemented, there are four cutting gaps 481, the adjacent cutting gaps 481 are at an angle of ninety degrees, the four cutting gaps 481 are distributed in a cross shape, and the circular card 48 is divided into four pieces by four cross-cutting gaps 481. Separate jaws 42.

In a specific implementation, the inner wall of the neck of the syringe barrel 6 forms a toothed sleeve 61 matching the number of the hub 21, and the structure of the hub and the toothed sleeve prevents the injection needle from rotating during injection, thereby avoiding This brings pain to the patient. An annular retaining groove 62 is formed at the inner wall of the lower portion of the sleeve 61 to cooperate with the claw 42. A convex self-locking ring 63 is disposed at the lower inner wall of the syringe barrel 6.

In a specific implementation, the engaging portion of the end portion of the core rod 7 is an annular boss 701, and the outer diameter of the annular boss 701 is larger than the spacing between the top ends of the two pieces of the pawl piece 43. An annular card slot 702 is formed at the core of the lower portion of the 701, and a circular limiting piece 703 is formed at the core of the annular card slot 702. The piston 5 is sleeved between the annular card slot 702 and the circular limiting piece 703. At the core 7 between the pistons, the piston 5 is fixed by a circular limiting piece 703. In a specific implementation, the core rod 7 is provided with a rib 706 distributed in a cross shape, wherein a rib 707 is formed at a rib 706, and a protective sheet 708 is disposed at the notch, and both ends of the protective sheet 708 are notched. The two inner side wall points are connected, the protective piece 708 is formed near the middle portion to form a bent portion 709, the bent portion 709 is formed with a protrusion 711, and the rib 706 at the lower portion of the circular limiting piece 703 forms a "Γ" shape notch 704, Γ "The edge of the rib 706 outside the shape notch 704 forms a vertical flange 705,"Γ" shaped notch 704 such that the vertical flange 705 at the rib 706 has elastic properties that mate with the self-locking ring 63 in the syringe barrel 6. When the core rod can neither push forward nor pull back, the self-locking function of the core rod is realized.

In a specific implementation, the diameter of the annular boss 701 is larger than the spacing between the two pieces of the pawl piece 43, so as to ensure that when the core rod is pulled back, the annular boss 701 at the end of the core rod is in two pieces. Above the end of the pawl piece 43, the engagement locking effect of the core rod and the needle seat is achieved.

In a specific implementation, the core rod 7 is provided with a rib 706 distributed in a cross shape, wherein a rib 707 is formed at a rib 706, and a protective sheet 708 is disposed at the notch, and both ends of the protective sheet 708 are notched. The inner side wall points are connected to each other, the protective sheet 708 is formed near the middle portion to form a bent portion 709, and the bent portion 709 is formed with a protrusion 711. When the assembly is completed, the protrusion of the protective sheet just abuts against the outer edge of the lower end of the syringe barrel 6. When in use, the protective sheet is pressed inward along the bent portion, and the protective sheet is bent inward so that the protrusion is displaced inward. The outer edge of the lower end of the ejector barrel 6 can be used normally. This structure can effectively prevent the syringe from being mishandled, trigger the internal safety mechanism, and cause the syringe to be scrapped.

As shown in Fig. 7, Fig. 8, Fig. 9, Fig. 10 and Fig. 11, the whole process of the present invention is used. Figure 7 is a cross-sectional view showing the plane structure of the liquid pumping. Before pushing the liquid, the protective sheet is pressed first, and the blocking of the pusher of the core rod is canceled, as shown in the plane structure of the liquid pushing state of Fig. 8, During the liquid process, the anti-retraction resistance is achieved by the outer ring of the elastic supporting clip and the retaining groove of the syringe barrel, and the anti-retraction resistance of the two can be achieved just enough to achieve the resisting force and the pulling back force. Balanced structure. When the liquid injection is about to be completed, the reduced-diameter bevel on the top of the core rod slowly supports the two pawls of the elastic support clip. Once over the upper end surface of the pawl, the pawl is snapped into the card slot of the core rod and completed. Injection, as shown in Figure 9.

After the injection is completed, the core rod is pulled back, as shown in FIG. 10, the elastic support card member is driven to move downward together under the engagement state between the card slot and the pawl of the core rod, and at the same time, the claw of the elastic support card member is elastically supported. The bending occurs at a sudden change in thickness, so that the outer diameter of the claw becomes small, and the detachment of the outer groove of the outer sleeve is smoothly performed. Then continue to pull down the core rod, when the lower end surface of the annular flange of the elastic support clip contacts the lower end surface of the inner groove of the hub cone, the core rod will drive the entire needle seat with the universal injection needle until the core rod The vertical flange passes over the self-locking ring of the syringe barrel, and the circular limiting piece and the vertical flange of the core rod are stuck at the self-locking ring of the syringe barrel. At this time, the core rod can neither be pulled back nor pushed forward. As shown in Fig. 11, at this time, the entire needle head is retracted into the inside of the syringe, and a self-locking is achieved. Finally, use a little bit of self-destruction to break or break the core rod and destroy the head of the core rod in the jacket.

The above is a further detailed description of the present invention in conjunction with the specific preferred embodiments. It is to be understood by those skilled in the art that the present invention may be construed as being limited to the scope of the present invention without departing from the spirit and scope of the invention.

Claims

Claim

1. A pullback type self-locking self-destructing syringe, comprising a syringe barrel (6), a core rod (7) is arranged in the syringe barrel (6), and the core rod (7) is sleeved near the end Piston

(5), a needle holder is arranged in the neck of the end of the syringe barrel (6), and a sealing ring (3) is sleeved on the outer wall of the needle seat, wherein: the upper part of the needle seat forms a replaceable needle head, and the needle seat The lower cavity is provided with an elastic supporting clip ( ₄ ), and the elastic supporting clip (4) is provided with a locking and engaging mechanism matched with the end of the core rod, the locking and engaging mechanism has elastic characteristics, and the elastic supporting clip (4) Externally forming an elastic support limiting mechanism that cooperates with the inner wall of the inner cavity of the syringe barrel (6), and the end of the core rod forms a nip portion that cooperates with the locking engagement mechanism.

2. A pull-back type self-locking self-destructing syringe, which comprises a syringe barrel (6), a core rod (7) is arranged in the syringe barrel (6), and the core rod (7) is sleeved near the end Piston

(5) a needle holder is arranged in the neck of the end of the syringe barrel (6), and the outer wall of the needle seat is sleeved with a sealing ring (3), wherein the lower part of the needle holder is provided with an elastic supporting card (4) The elastic supporting clip (4) is provided with a locking and engaging mechanism matched with the end of the core rod, the locking and engaging mechanism has an elastic characteristic, and the elastic supporting clip (4) is externally formed with the syringe barrel ( 6) An elastic support limiting mechanism that cooperates with the inner wall of the inner cavity, and the end of the core rod forms a nip portion that cooperates with the locking and engaging mechanism.

3 . The pull-back safety self-locking self-destructing syringe according to claim 1 , wherein: the replaceable needle head is a cone seat ( 2 ) with a guiding hub, the guiding hub The screw of the cone (2) can be matched with the injection needle (1).

4 . The pull-back safety self-locking self-destructing syringe according to claim 1 , wherein: the inner wall of the lower cavity of the needle seat forms an annular inner groove ( 22 ), and the needle seat An annular outer groove (23) is provided at the outer wall, and the sealing ring (3) is disposed in the annular outer groove (23).

The pull-back type self-locking self-destructing syringe according to claim 3, wherein: the outer wall of the cone (2) of the guiding hub is uniformly distributed in a ring shape with teeth with guiding function Hub (21).

6 . The pull-back safety self-locking self-destructing syringe according to claim 1 , wherein: the elastic support clip ( 4 ) has an approximately hollow cylindrical shape, and the upper part of the elastic support clip ( 4 ) is formed. Two mutually symmetric elastic deformation fins (45), an annular flange (41) forming an inner annular groove (22) at an outer outer edge of the elastic deformation fin (45), two elastic deformation fins A notch (44) is formed between (45), and the upper surface of the elastic supporting clip (4) at the lower portion of the notch (44) forms two symmetrical curved platforms (47), and the two curved platforms (47) are respectively A pawl piece (43) is provided, and the two pawl pieces (43) are symmetrical with each other, and the extension lines of the upper ends of the two pieces of the pawl pieces (43) form an angle, and both sides of the pawl piece (43) and the elastic deformation piece (45) A gap (46) is formed between the inner sides, a circular card (48) is disposed at a lower portion of the elastic support card member (4), and a plurality of cutting gaps (481) are provided at the circular card (48). The card (48) is divided into corresponding individual jaws (42) by a plurality of cutting gaps (481).

The pull-back safety self-locking self-destructing syringe according to claim 1, wherein the inner wall of the neck of the syringe barrel (6) is formed to match the number of the hubs (21). The tooth sleeve (61), the inner wall of the lower portion of the sleeve (61) forms an annular retaining groove (62) which cooperates with the claw (42), and the inner wall of the lower portion of the syringe barrel (6) is provided with a convex shape. Self-locking ring (63).

8. A pullback type self-locking self-destructing syringe according to claim 1 The occlusion portion of the end of the core rod (7) is an annular boss (701) having an outer diameter larger than the outer diameter of the two pawl sheets (43). The spacing, the core of the lower portion of the annular boss (701) forms an annular card slot (702), and the core of the annular card slot (702) forms a circular limiting piece (703), and the piston (5) It is sleeved at the core rod (7) between the annular card slot (702) and the circular limiting piece (703).

The pull-back safety self-locking self-destructing syringe according to claim 1, wherein: the core rod (7) is provided with a reinforcing rib (706) distributed in a cross shape, wherein one of the reinforcing rods A notch (707) is formed at the rib (706), and a protective sheet (708) is disposed at the notch. Both ends of the protective sheet (708) are connected with the two inner sidewall points of the notch, and the protective sheet (708) is folded near the middle portion. a curved portion (709), a protrusion (711) is formed at the bent portion (709), and a "Γ" shape notch (704) is formed at the lower portion of the circular limiting piece (703), and the shape of the "Γ" is formed. The edge of the rib (706) outside the notch (704) forms a vertical flange (705).