CN110812606A

CN110812606A - Hand-operated locking type syringe

Info

Publication number: CN110812606A
Application number: CN201911249196.7A
Authority: CN
Inventors: 梅丹丹; 卢金云; 余刚
Original assignee: Hongyu Anhui Wuzhou Medical Instrument Ltd By Share Ltd
Current assignee: Hongyu Anhui Wuzhou Medical Instrument Ltd By Share Ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-02-21

Abstract

The invention relates to the field of medical instruments, in particular to a manual locking type injector, which comprises an injection tube, a core rod and a core rod locking mechanism, wherein the core rod locking mechanism is used for locking the core rod and comprises a cross rod, a guide groove, an annular groove and a clamping piece; the cross rod is arranged along the radial direction of the core rod, the guide groove is a through groove for the wedge-shaped end of the cross rod to pass through, and the annular groove is arranged along the circumferential direction of the inner wall of the injection cylinder and is connected with the guide groove; in the vertical direction, the distance from the cross rod to the bottom end of the core rod is equal to the distance from the annular groove to the bottom end of the injection tube; the pair of clamping pieces are fixed in the annular groove in a bilateral symmetry mode around the axial direction of the guide groove. The clamping piece arranged on the injection tube is matched with the core bar locking piece for locking the core bar, so that the core bar is locked in the injection tube and can not rotate or be drawn out after the manual locking type injector is used.

Description

Hand-operated locking type syringe

Technical Field

The invention relates to the technical field of medical instruments, in particular to a manual locking type injector.

Background

The syringe is widely used in the medical field, and medical staff uses the syringe to suck liquid medicine and then injects the liquid medicine into human bodies to achieve the treatment effect. At present, the conventional injector comprises an injection tube, a core bar and an injection needle, wherein a breaking groove is formed in one end, close to the liquid outlet of the injection tube, of the core bar, and when medical staff use the injector, the core bar can be pulled out of the injection tube and broken along the breaking groove to achieve the self-destruction effect in order to prevent the injector from being used again; however, the process of pulling the plunger rod out of the syringe barrel is prone to injury by the medical personnel and is cumbersome and inconvenient. In the prior art, a locking structure is also arranged between the tail part of the injection tube and the core rod, the locking structure generally comprises a clamping convex ring at the tail part of the injection tube, a clamping flange on the core rod and a lantern ring for auxiliary assembly, and the locking structure can well realize the clamping and locking after the core rod retracts, but the locking structure is complex, difficult to assemble and high in cost.

In order to facilitate installation, the core rod can be clamped without being pulled out and broken off after use or retracted after use, so that the manual locking type syringe needs to be designed to meet the use requirements of medical workers.

Disclosure of Invention

In view of the above, the present invention is directed to a manual locking syringe, in which a locking piece is provided on a syringe barrel to cooperate with a plunger locking member for locking a plunger, so that the plunger is locked in the syringe barrel after use and cannot be rotated or withdrawn.

The invention solves the technical problems by the following technical means:

the manual locking type injector comprises an injection cylinder, a core rod and a core rod locking mechanism, and is characterized by further comprising a core rod locking mechanism for locking the core rod, wherein the core rod locking mechanism comprises a cross rod, a guide groove, an annular groove and a clamping piece;

the cross rod is arranged along the radial direction of the core rod, one end of the cross rod is fixedly connected with the core rod, the other end of the cross rod is a wedge-shaped end, a clamping block is formed at the wedge-shaped end, and the two side surfaces of the clamping block are in a wedge shape;

the guide groove is a through groove for the wedge-shaped end of the cross rod to pass through, and is arranged on the inner wall of one end of the opening of the injection cylinder along the axial direction of the injection cylinder;

the annular groove is circumferentially arranged along the inner wall of the injection cylinder, is connected with the guide groove and can be used for the wedge-shaped end of the cross rod to slide inside; in the vertical direction, the distance from the cross rod to the bottom end of the core rod is equal to the distance from the annular groove to the bottom end of the injection tube;

the pair of the clamping pieces are fixed in the annular groove in a bilateral symmetry mode around the axial direction of the guide groove, and the clamping pieces are arranged in an inclined mode to form inclined planes matched with the wedge-shaped surfaces on the cross rods.

Furthermore, the core bar is made of ribs, the core bar is formed by arranging four ribs in a cross manner, one end of the core bar is a hand-push part, and the other end of the core bar is connected with a piston.

Further, the core bar and the cross bar are integrally formed.

Further, the card is a steel sheet.

Furthermore, the inner wall of the end, close to the opening, of the injection cylinder is provided with an annular bulge, and the annular bulge and the guide groove form a bayonet.

The invention is provided with a core bar locking piece, wherein the core bar locking piece comprises a cross bar, a guide groove, an annular groove and a clamping piece; the cross bar cooperates with the guide slot, annular groove and tabs for locking the plunger rod to prevent the plunger rod from being withdrawn from the syringe barrel and reused. The annular groove is connected with the guide groove, one end of the cross rod is fixedly connected with the core rod, the other end of the cross rod is a wedge-shaped end, and under the action of external force, the wedge-shaped end of the cross rod can move downwards along the guide groove and enter the annular groove; a pair of clamping pieces are fixed in the annular groove in a bilateral symmetry mode around the axial direction of the guide groove and used for locking the cross rod. In the vertical direction, the distance from the cross rod to the bottom end of the core rod is equal to the distance from the annular groove to the bottom end of the injection tube, after the injection of medical personnel is finished, the wedge-shaped end is just positioned in the annular groove, the core rod is rotated leftwards or rightwards at the moment, and the wedge-shaped end of the cross rod slides in the annular groove; when the wedge-shaped end slides to be abutted against the card, the wedge-shaped end on the wedge-shaped end is matched with the obliquely arranged card, the wedge-shaped end extrudes the card under the action of external force, the card deforms, the wedge-shaped end passes over the card at the moment, and the wedge-shaped surface matched with the card at the wedge-shaped end reaches the other side of the card from one side of the card; at the moment, the surfaces of the wedge-shaped end, which are contacted with the clamping piece, are not matched with each other any more, so that the wedge-shaped end, which is fixedly connected with the core bar through the cross rod, can not return to the guide groove any more when being locked in the annular groove by the clamping piece, and the core bar can not be drawn out from the injection cylinder; so, this scheme has reached the effect of locking the core bar, easy operation, and the practicality is strong.

Drawings

FIG. 1 is a cross-sectional view of a manually lockable syringe in accordance with embodiment 1 of the invention;

FIG. 2 is a front view of a core rod in embodiment 1 of the present invention;

FIG. 3 is a schematic view of the assembly of the plunger of embodiment 1 of the present invention within the syringe barrel;

FIG. 4 is a top view of the locked core rod of example 1 of the present invention;

FIG. 5 is a sectional view of a core rod in example 2 of the present invention;

FIG. 6 is an enlarged view taken at A in FIG. 5;

fig. 7 is a schematic view of the torsion spring of fig. 6 in a relaxed state.

The reference numerals in the figure comprise an injection tube 1, a boss 12, a reinforcing rib 13, a guide groove 14, an annular groove 15, a clamping piece 16, an annular protrusion 17, an injection needle connector 18, a core bar 2, a hand push part 21, a first cross bar 22, a wedge-shaped end 221, a piston 23, a rotation stopping pattern 231, a sleeve 3, an annular clamping groove 31, a second cross bar 32, a push rod 4, a limiting rod 41, a knife cylinder 5, a connecting strip 6, a connecting rod 7, an installation part 71 and a torsion spring 8.

Detailed Description

The invention will be described in detail below with reference to the following figures and specific examples:

example 1

The present embodiment provides a manual locking syringe, which comprises a syringe barrel 1 and a plunger locking element, as shown in fig. 1, an open end of the syringe barrel 1 extends in a radial direction to form a boss 12, and medical staff holds the boss 12 to facilitate injection during injection. The surface of the boss 12 is provided with a reinforcing rib 13 for improving the strength and rigidity of the boss 12. The injection tube 1 is provided with an injection needle joint 18 along one end of the liquid outlet, and can be matched and installed with injection needles with various specifications in the prior art.

As shown in fig. 2, the core rod 2 is formed by four ribs arranged in a cross shape, the top end of the core rod 2 is a hand-push part 21, the hand-push part 21 is a circular piece, the surface of the circular piece is provided with anti-slip lines, and the bottom end of the core rod 2 is connected with a piston 23 for pushing liquid during injection.

The stem lock includes a first cross bar 22, a guide slot 14, an annular groove 15, and a tab 16. The first cross rod 22 is arranged along the radial direction of the core rod 2, one end of the first cross rod is fixedly connected with the core rod 2, the other end of the first cross rod is a wedge-shaped end 221 and points to the inner wall of the injection cylinder 1, two side surfaces of the wedge-shaped end 221 are arranged in an inclined mode, and the first cross rod 22 and the core rod 2 are integrally formed through injection molding technology.

A pair of guide way 14 sets up on the inner wall of 1 opening one end of injection tube along 1 axial symmetry of injection tube, and the top of guide way 14 flushes with the opening part of injection tube 1, and even there is annular groove 15 bottom of guide way 14, and this annular groove 15 sets up around the inner wall circumference of injection tube 1. The width of guide way 14 is greater than the width of wedge end 221, and the width of annular groove 15 is greater than the thickness of wedge end 221, aligns wedge end 221 with the opening of guide way 14, and wedge end 221 follows core bar 2 and moves together, can follow the opening and be pushed into guide way 14 in, can not influence the normal liquid medicine and the liquid medicine injection of drawing of manual locking syringe. In the vertical direction, the distance from the first cross bar 22 to the piston 23 is equal to the distance from the annular groove 15 to the bottom end of the syringe barrel 1, and when the manual locking syringe finishes injecting the liquid medicine, the piston 23 abuts against the bottom end of the syringe barrel 1, and at the moment, the wedge-shaped end 221 slides from the guide groove 14 into the annular groove 15.

The two sides of each guide groove 14 are symmetrically provided with clamping pieces 16, the clamping pieces 16 are obliquely arranged in the annular groove 15, one end of each clamping piece 16 is embedded into the injection cylinder 1 to realize fixed connection, and the inclined surface formed by the clamping pieces 16 is matched with the two side surfaces of the wedge-shaped end 221. The card 16 in the embodiment is preferably a steel sheet with certain hardness and elasticity, when the wedge-shaped end 221 is positioned in the annular groove 15, the core rod 2 is rotated leftwards or rightwards, and the wedge-shaped end 221 slides in the annular groove 15 until being abutted against the card 16; the wedge-shaped end 221 presses the card 16 under the action of external force to deform the card 16, and the wedge-shaped end 221 passes over the card 16, so that the surfaces of the wedge-shaped end 221, which are contacted with the card 16, are not matched with each other; the card 16 has a stiffness such that the wedge end 221 is locked in the annular groove 15 and cannot pass the card 16 in the opposite direction.

The inner wall of the opening end of the injection tube 1 is circumferentially provided with an annular bulge 17, the annular bulge 17 and the guide groove 14 form a bayonet, and the annular bulge 17 is used for limiting the piston 23 and preventing the piston 23 from being separated from the injection tube 1. As shown in FIG. 3, the manually lockable syringe can be used normally by aligning the wedge-shaped end 221 with the guide groove 14 and pushing the plunger 2 into the syringe 1, so that the plunger 2 and the syringe 1 are engaged with each other.

As shown in FIG. 4, when the manual locking syringe is used, the piston 23 abuts against the bottom end of the syringe barrel 1, and the wedge-shaped end 221 is located in the annular groove 15. Rotating the core rod 2 leftwards or rightwards, sliding the wedge-shaped end 221 in the annular groove 15 until the wedge-shaped end is abutted against the card 16, and extruding the card 16 by the wedge-shaped end 221 under the action of external force to deform the card 16; at this point, the wedge-shaped end 221 passes over the card 16, the surfaces of the wedge-shaped end 221 that contact the card 16 no longer cooperate with each other, and the wedge-shaped end 221 is locked in the annular groove 15 by the card 16 and cannot pass over the card 16 in the opposite direction.

The working process of the embodiment 1 is as follows: before the medical staff uses, the wedge-shaped end 221 is aligned with the guide groove 14 to push the core rod 2 into the injection tube 1, the core rod 2 is matched with the injection tube 1, and at the moment, the manual locking type injector can normally suck the liquid medicine. During the injection of the medicine into the patient, the wedge-shaped end 221 moves along the guide groove 14 by the external force; after the medicine is injected, the piston 23 abuts against the bottom end of the injection tube 1, the wedge-shaped end 221 slides right into the annular groove 15, at this time, the core rod 2 is rotated leftwards or rightwards, the wedge-shaped end 221 passes over the card 16 under the action of external force, and the card 16 locks the wedge-shaped end 221 in the annular groove 15 so that the wedge-shaped end 221 cannot pass over the card 16 in the opposite direction; as the first cross bar 22 and the core rod 2 are integrally formed, the core rod 2 is locked by the clamping piece 16 and cannot be drawn out from the injection tube 1, so that the effect of locking the core rod is achieved.

Example 2

The difference between this embodiment and embodiment 1 is that the core rod is divided into two sections, the upper portion of the core rod is a rotating portion, and the lower portion of the core rod is a pushing portion. In order to better see the structure of the rotating part, a part a in fig. 5 is shown in a cross-sectional view, fig. 6 is an enlarged view of a part a, and as shown in fig. 6, the rotating part includes a sleeve 3 and a push rod 4, the sleeve 3 is a hollow cylinder, one end opposite to the push liquid part is an opening, the other end is a bottom, and a through hole is formed in the bottom surface. The bottom end of the push rod 4 enters the cavity of the sleeve 3 from the through hole of the sleeve 3 and is vertically placed, the top end of the push rod 4 is exposed outside the sleeve 3, the top end is a hand-push part, the hand-push part is a round piece, and the upper end of the surface of the round piece is provided with anti-skid lines, so that the operation of medical staff is facilitated. A threaded section is arranged at one end of the push rod 4 opposite to the opening of the sleeve 3, the threaded section is an internal thread, and a cutter barrel 5 is sleeved outside the threaded section; the inner peripheral wall of the knife cylinder 5 is provided with external threads matched with the internal threads of the push rod 4, and then the push rod 4 and the knife cylinder 5 form a screw rod structure. The knife cylinder 5 is divided into a left half surface and a right half surface, the bottom end of each half surface is obliquely and upwards cut with a blade part, the left half surface and the right half surface are centrosymmetric around the axis of the push rod, and therefore the left blade part and the right blade part are arranged in an X shape when viewed from the side. The knife cylinder 5 of the embodiment is made of steel materials, and the sharp edge part is convenient for cutting.

Be equipped with gag lever post 41 along push rod 4 is radial, and the one end of gag lever post 41 is fixed on push rod 4, and the other end is the wedge, and the one side slope setting relative with sleeve 3 opening, and the directional inner wall of sleeve 3 of wedge one end. A certain gap is left between the end of the limiting rod 41 and the inner wall of the sleeve 3, and the limiting rod 41 can move up and down in the cavity of the sleeve 3 under the action of external force. An annular bulge is arranged on the inner wall of the sleeve 3 along the circumferential direction of the sleeve, an annular clamping groove 31 is formed in the annular bulge, and the end part of the limiting rod 41 can be clamped in the annular clamping groove 31. One surface of the limiting rod 41 facing the through hole of the sleeve 3 is a straight surface, the straight surface abuts against the top surface of the ring-shaped clamping groove 31, and the push rod 4 is limited to move upwards in the sleeve 3 under the action of external force. The surface of the ring-shaped slot 31 contacting with the lower part of the limiting rod 41 is an inclined surface and is matched with the inclined surface of the limiting rod 41. The stopper rod 41 and the ring-shaped groove 31 are generally fixed to each other, but when a sufficient external force is applied to the stopper rod 41, the stopper rod 41 can be pushed out from the ring-shaped groove 31.

An installation part 71 is formed at one end of the liquid pushing part opposite to the rotating part, the installation part 71 is a cylinder and has a certain thickness, and a certain distance is reserved between the rotating part and the installation part 71. The connecting rod 7 is fixedly arranged on the opposite surface of the mounting part 71 and the rotating part, the connecting rod 7 is vertically arranged between the rotating part and the mounting part 71, one end of the connecting rod 7 extends into the sleeve 3 and keeps a certain distance with the bottom end of the push rod 4, the connecting rod 7, the mounting part 71 and the liquid pushing part are coaxially arranged, and the diameter of the connecting rod 7 is smaller than that of the knife cylinder 5. A plurality of connecting strips 6 are uniformly distributed on one end of the connecting rod 7 positioned in the sleeve 3 around the circumferential direction of the outer wall of the sleeve, one end of each connecting strip 6 is integrally formed with the connecting rod 7, and the other end of each connecting strip is fixedly connected with the inner wall of the sleeve 3. Torsional spring 8 includes body and two torque arms, the body cover is established on connecting rod 7, the mounting groove has been seted up on sleeve 3's the inner wall simultaneously, the torque arm fixed connection of 8 homonymies of torsional spring is at the mounting groove, the draw-in groove with 8 outline matched with of torsional spring is seted up around the periphery wall of connecting rod 7 in the one side that installation department 71 is relative with the rotation portion, the lower extreme of 8 body rings of torsional spring and another torque arm of torsional spring 8 insert in the draw-in groove, and then this torque arm is restricted by the cell wall of draw-in groove, can not take place relative movement with installation department 71 in the horizontal direction. For the convenience of production, the present embodiment is produced by assembling components, so that some auxiliary structure for rotation matching can be provided for the connecting strip 6, for example, a connecting ring is formed around one end of the connecting strip 6 fixedly connected with the inner wall of the sleeve 3, and the end of the connecting strip 6 is assembled with the inner circumferential wall of the sleeve 3 by bonding or clamping through the connecting ring to realize the fixed connection of the connecting strip 6 and the inner circumferential wall of the sleeve 3.

The outer wall of the bottom end of the piston 23 is provided with a rotation stopping pattern 231, and the inner wall of the bottom end of the syringe 1 is also provided with a rotation stopping pattern 231 matched with the bottom end of the piston 23. The rotation stopping pattern increases the friction between the piston 23 and the inner wall of the injection tube 1, and after the injection is finished, the piston 23 is abutted against the bottom end of the injection tube 1, and the piston 23 and the injection tube 1 are not easy to rotate relatively.

Along the radial second horizontal pole 32 that is equipped with of sleeve 3's outer wall, second horizontal pole 32 one end and sleeve 3's outer wall fixed connection, the directional inner wall of injection tube 1 of the other end, second horizontal pole 32 and sleeve 3 integrated into one piece. The second cross bar 32 can be used in cooperation with the guide groove 14, the annular groove 15 and the catch 16 on the inner wall of the syringe 1.

As shown in FIG. 7, after the injection of the liquid medicine is completed, the piston 23 abuts against the bottom end of the syringe 1, the anti-rotation pattern 231 at the bottom end of the piston 23 is matched with the anti-rotation pattern 231 at the bottom end of the syringe 1, and the second cross bar 32 is just located in the annular groove 15. After the injection needle is pulled out of the skin of the human body, proper thrust is applied to the push rod 4, so that the limiting rod 41 is separated from the annular clamping groove 31 and moves downwards in the sleeve 3; at the moment, the knife cylinder 5 also moves downwards until the knife cylinder abuts against the connecting strip 6, the push rod 4 is continuously pushed, the linear motion of the push rod 4 is converted into the rotary motion of the knife cylinder 5 around the push rod 4, the knife cylinder 5 quickly cuts off the connecting strip 6 in the rotary process, the fixed connection between the sleeve 3 and the connecting rod 7 is broken, and at the moment, the torsion spring 8 returns to the loosening state without the action of external force. Since the rotation stop pattern 231 of the plunger 23 and the syringe 1 are engaged with each other to keep the liquid pushing portion immovable against the restoring force of the torsion spring 8, the sleeve 3 is rotated under the urging force of the torsion spring 8, so as to drive the second cross bar 32 to slide in the annular groove 15 and pass over the locking piece 16, so that the end of the second cross bar 32 is locked in the annular groove 15 by the locking piece 16 and cannot move in the opposite direction.

The working process of the embodiment 2 is as follows: before using the hand-operated locking syringe, the medical staff aligns the end of the second cross bar 32 with the guide groove 14 and pushes the core bar into the syringe 1, the core bar is matched with the syringe 1, and at this time, the hand-operated locking syringe normally sucks liquid medicine or injects liquid medicine. When the liquid medicine is to be injected into a patient after the liquid medicine is sucked, the push rod 4 is pushed, the limiting rod 41 is clamped by the annular clamping groove 31, and the end part of the second cross rod 32 slides downwards along the guide groove 14 under the action of force. After the liquid medicine is injected, the piston 23 abuts against the bottom end of the syringe 1, the rotation stopping pattern 231 at the bottom end of the piston 23 is matched with the rotation stopping pattern 231 at the bottom end of the syringe 1, and at this time, the second cross rod 32 is just positioned in the annular groove 15. After the injection needle is pulled out of the skin of the human body, proper thrust is applied to the push rod 4, so that the limiting rod 41 is separated from the annular clamping groove 31 and moves downwards in the sleeve 3, and the knife cylinder 5 also moves downwards until the limiting rod abuts against the connecting strip 6; the push rod 4 is continuously pushed, the linear motion of the push rod 4 is converted into the rotation motion of the knife cylinder 5 around the push rod 4, the rotating knife cylinder 5 and the connecting strip 6 rub with each other and quickly cut off the connecting strip 6, the stable structure between the sleeve 3 and the connecting rod 7 is broken, and the torsion spring 8 returns to the loosening state under the effect of no external force. Since the plunger 23 and the detent pattern 231 of the syringe 1 cooperate with each other to keep the liquid pushing portion immovable against the restoring force of the torsion spring 8, the sleeve 3 starts to rotate under the urging force of the torsion spring 8, the rotation of the sleeve 3 drives the end portion of the second rail 32 to slide in the annular groove 15 and to pass over the card 16, and the card 16 locks the end portion of the second rail 32 in the annular groove 15 so that the end portion of the second rail 32 can not pass over the card 16 in the opposite direction. Because second horizontal pole 32 and sleeve 3 integrated into one piece, and sleeve 3 passes through torsional spring 8 with the portion of pushing away liquid and is stably connected, thereby the core bar is locked by card 16 and can't be taken out in injection tube 1, has reached the effect of locking the core bar, this embodiment easy operation, the practicality is strong, and need not to do the action of rotatory core bar alone again, only need to continue the action of pushing away liquid a little after the injection is accomplished and can accomplish the locking, the one hand can be operated, it is more convenient to use.

The installation process of this embodiment is, at first with push rod 4 from the vertical propelling movement of the opening part of sleeve 3 in the cavity of sleeve 3, in the stopper rod 41 card was gone into ring groove 31 under certain exogenic action, push rod 4 was blocked in sleeve 3 by ring groove 31 is stable this moment. The top end of the push rod 4 is exposed outside the sleeve 3, and the hand-push part is assembled at the top end of the push rod 4 to realize fixed connection. The end of the connecting rod 7 provided with the connecting strip 6 is placed into the sleeve 3, and the connecting strips 6 are assembled with the inner wall of the sleeve 3. Then up the cover on connecting rod 7 with the body of circle of torsional spring 8 from the lower extreme of connecting rod, simultaneously with an arm and the mounting groove assembly of torsional spring 8, later with the lower extreme and the installation department 71 assembly of connecting rod 7 together, the lower extreme of the body of circle of another arm and torsional spring 8 inserts in the draw-in groove, adjust torsional spring 8 to the energy storage state through rotatory rotation portion (two wrenching arms of torsional spring 8 are in same one side and basically parallel), accomplish connecting rod 7 and installation department 71's fixed this moment again, the assembly of whole core bar is accomplished, assembly between core bar and injection tube 1 does not do here and describe repeatedly.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.

Claims

1. The manual locking type injector comprises an injection cylinder, a core rod and a core rod locking mechanism, and is characterized by further comprising a core rod locking mechanism for locking the core rod, wherein the core rod locking mechanism comprises a cross rod, a guide groove, an annular groove and a clamping piece;

the annular groove is circumferentially arranged along the inner wall of the injection cylinder, is connected with the guide groove and can be used for the wedge-shaped end of the cross rod to slide; in the vertical direction, the distance from the cross rod to the bottom end of the core rod is equal to the distance from the annular groove to the bottom end of the injection tube;

2. The manually lockable syringe of claim 1 wherein the plunger rod comprises four ribs arranged in a criss-cross pattern, one end of the plunger rod being a hand push portion and the other end of the plunger rod being connected to a plunger.

3. The manually-lockable syringe of claim 1 wherein the core pin is integrally formed with the cross-bar.

4. The manually-lockable syringe of claim 1, wherein the card is a steel sheet.

5. The manually lockable syringe according to claim 1, wherein the inner wall of the barrel near the open end is provided with an annular projection, and the annular projection and the guide groove form a bayonet.