A medical syringe

Abstract

The present invention discloses a medical syringe, belonging to the technical field of syringes, which includes a syringe barrel. One end of the syringe barrel is fixedly provided with a cover plate. A support plate is arranged on the side of the cover plate away from the syringe barrel. A plunger is slidably arranged inside the syringe barrel. One end of the plunger close to the cover plate is provided with a connecting rod. A part of the connecting rod close to the top passes through the support plate. A collar is sleeved outside the connecting rod. The collar can drive the connecting rod to rotate synchronously through a positioning unit, and the connecting rod can move along its axis relative to the collar during the rotation process; during the process of the medical staff driving the cantilever to reciprocate and deflect, the gear can drive the collar and the connecting rod to rotate in a single direction, so as to continuously drive the plunger to move in a direction away from the needle tube. Compared with the traditional syringe, this device is convenient for single-handed operation to extract the liquid medicine, so that the liquid medicine in the medicine bottle can be quickly extracted.

Description

Technical Field

[0001] The present invention relates to the technical field of syringes, and particularly to a medical syringe. Background Art

[0002] A syringe is a structure used for the process of extracting, injecting gas or liquid with a needle.

[0003] Chinese invention patent CN116036417A discloses a medical syringe. Through a piston connection structure provided, when the push rod moves in the syringe barrel, the piston is connected to the piston connection structure. The piston connection structure includes a piston sealing column arranged on the inner wall of the syringe barrel. One end of the piston sealing column is connected to the inner wall of the syringe barrel, and the other end of the piston sealing column is a free end. The piston sealing column is provided with a smooth surface. The function of the piston connection structure is to cooperate with the piston to improve the overall sealing performance of the syringe, prevent external air from entering the syringe, and improve the safety of using the syringe.

[0004] The above device improves the stability of the movement of the push rod and the push plate by the cooperation of the provided holding block and the chute. However, during the process of extracting liquid medicine with the syringe, it is difficult for medical staff to operate the syringe with one hand, resulting in inconvenience in use. In summary, the above device still has room for improvement.

[0005] Therefore, it is necessary to provide a medical syringe to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a medical syringe to solve the problem that in the existing device, the stability of the movement of the push rod and the push plate is improved by the cooperation of the provided holding block and the chute, but it is difficult for medical staff to operate the syringe with one hand during the process of extracting liquid medicine with the syringe as mentioned in the above background art.

[0007] Based on the above idea, the present invention provides the following technical solution: A medical syringe includes a syringe barrel. One end of the syringe barrel is fixedly provided with a cover plate. A support plate is arranged on the side of the cover plate away from the syringe barrel. A plug is slidably arranged inside the syringe barrel. One end of the plug close to the cover plate is provided with a connecting rod. The part of the connecting rod close to the top passes through the support plate. A collar is sleeved outside the connecting rod. The collar can drive the connecting rod to rotate synchronously through a positioning unit, and during the rotation of the connecting rod, it can move along the axis direction relative to the collar.

[0008] A gear is sleeved on the outer side of the collar, and the gear can rotate in a single direction relative to the collar. A rack meshing with the gear is slidably mounted on the support plate. During the reciprocating movement of the rack relative to the support plate, the meshing of the rack and the gear can drive the connecting rod to rotate in a single direction. The connecting rod and the cover plate are matched with a limiting unit, so that the connecting rod can move along the axial direction of the syringe during the rotation relative to the cover plate.

[0009] As a further solution of the present invention: the positioning unit includes a positioning bar fixedly connected to the inner wall of the collar, and a positioning groove slidingly matched with the positioning bar is opened on the outer peripheral wall of the connecting rod, and the positioning groove is arranged along the axial direction of the connecting rod.

[0010] As a further solution of the present invention: the limiting unit includes a limiting block fixedly connected to the cover plate, a through hole matching with the connecting rod is opened at the center position of the cover plate, the limiting block is fixedly arranged on the inner wall of the through hole, and a limiting groove slidingly matched with the limiting block is opened on the outer peripheral wall of the connecting rod, and the limiting groove is arranged in a spiral shape.

[0011] As a further solution of the present invention: cantilevers are hinged on both sides of the top of the support plate, a sliding bar is arranged under the cantilever, the sliding bar is slidably matched with the support plate, and the sliding bar is fixedly connected to the rack through a pillar, a sliding block is fixedly arranged on the top surface of the sliding block, and a sliding groove is opened on the cantilever for slidingly matching with the sliding block.

[0012] As a further solution of the present invention: a pressure plate is rotatably mounted on the top end surface of the connecting rod, and the pressure plate and the connecting rod are elastically matched, and both sides of the top surface of the pressure plate are integrally formed with protrusions.

[0013] As a further solution of the present invention: a circular hole is opened on the bottom end surface of the pressure plate and near the center, the part of the connecting rod near the top extends into the circular hole, a clamping block is elastically installed on the outer peripheral wall of the connecting rod, the end surface of the clamping block away from the connecting rod is set as an inclined surface, and a clamping groove matching the clamping block is opened on the inner wall of the circular hole.

[0014] As a further solution of the present invention: a mounting hole is opened at the top wall inside the circular hole, a pull rod is fixedly arranged on the top end face of the connecting rod, the part of the pull rod away from the connecting rod and the cross-section of the mounting hole are both arranged to be T-shaped, one end of the pull rod away from the connecting rod is rotatably arranged in the mounting hole, and a limiting spring is arranged between the connecting rod and the top surface inside the circular hole.

[0015] As a further solution of the present invention: two bosses are integrally formed on one side of the support plate close to the cantilever, a plug rod is fixedly provided on the top surface of the boss, and an annular plug-in portion is integrally formed on the cantilever, so that the plug rod can be inserted into the plug-in portion and rotated to cooperate with the plug-in portion.

[0016] As a further solution of the present invention: an arc-shaped spring is installed between the two cantilevers.

[0017] As a further solution of the present invention: the width of the limiting groove is greater than the width of the positioning groove, and the limiting groove is communicated with the positioning groove.

[0018] Compared with the prior art, the beneficial effect of the present invention is that when driving the two cantilevers to deflect outwards, the rack will move towards the direction close to the connecting rod, thereby driving the gear to rotate in the reverse direction. Since the gear can only drive the collar to rotate in a single direction, during the process of the cantilever deflecting outwards, the gear is in a state of rotating alone. Repeating the above operation, during the process of the medical staff driving the cantilever to deflect reciprocally, the gear can drive the collar and the connecting rod to rotate in a single direction, thereby continuously driving the plug to move away from the syringe needle. Compared with the traditional syringe, this device is convenient for single-handed operation to extract the liquid medicine, so that the liquid medicine in the medicine bottle can be extracted quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the drawings and embodiments.

[0020] Figure 1 is the overall structural schematic diagram of the present invention;

[0021] Figure 2 is the three-dimensional structural schematic diagram of the present invention;

[0022] Figure 3 is the schematic diagram of the cooperation between the gear and the rack of the present invention;

[0023] Figure 4 is the schematic diagram of the cooperation between the positioning strip and the positioning groove of the present invention;

[0024] Figure 5 is the structural schematic diagram of the limiting groove and the positioning groove of the present invention;

[0025] Figure 6 is the schematic diagram of the cooperation between the rack and the support plate of the present invention;

[0026] Figure 7 is the schematic diagram of the cooperation between the connecting rod and the pressing plate of the present invention;

[0027] Figure 8 is the structural schematic diagram of the limiting block of the present invention;

[0028] Figure 9 is the present invention Figure 5 enlarged structural schematic diagram at position A;

[0029] Figure 10 is the structural schematic diagram of the convex block of the present invention;

[0030] Figure 11 It is a schematic diagram of the cooperation between the connecting rod and the plug head of the present invention.

[0031] In the figure: 1, syringe barrel; 2, cantilever; 201, insertion part; 202, chute; 3, pressing plate; 301, convex part; 302, clamping groove; 4, slide bar; 401, slider; 5, support plate; 501, boss; 5011, insertion rod; 502, strip-shaped groove; 503, guiding groove; 504, installation groove; 505, stepped hole; 6, connecting rod; 601, positioning groove; 602, limiting groove; 603, plug head; 604, pull rod; 7, rack; 701, clamping strip; 8, collar; 801, convex block; 8011, pressing surface; 9, gear; 901, notch; 10, clamping block; 1001, inclined surface; 11, cover plate; 1101, limiting block; 12, positioning strip; 13, limiting spring. Specific embodiments

[0032] As Figures 1 - 11 shown, a medical syringe includes a syringe barrel 1. A needle tube is connected to the bottom end of the syringe barrel 1, and a cover plate 11 is fixedly arranged at the top end of the syringe barrel 1. Referring to Figures 1 - 3 shown, a support plate 5 is fixedly arranged on the end face of the cover plate 11 away from the syringe barrel 1. A plug head 603 is slidably arranged inside the syringe barrel 1. A sealing ring can be fixedly sleeved on the outer side of the plug head 603, so that the plug head 603 is in sealing cooperation with the syringe barrel 1. A connecting rod 6 is arranged on the end face of the plug head 603 away from the needle tube. The connecting rod 6 can be rotatably matched with the plug head 603. During actual use, when the connecting rod 6 drives the plug head 603 to move away from the needle tube inside the syringe barrel 1, external liquid medicine can be drawn into the syringe barrel 1.

[0033] The part of the connecting rod 6 near the top passes through the support plate 5 and can move freely relative to the support plate 5. A collar 8 is sleeved on the outer side of the connecting rod 6. The collar 8 can drive the connecting rod 6 to rotate synchronously through a positioning unit, and the connecting rod 6 can move along its axis direction relative to the collar 8 during the rotation process. A gear 9 is sleeved on the outer side of the collar 8. The gear 9 can rotate along a single direction relative to the collar 8. Racks 7 are arranged on both sides of the gear 9 on the support plate 5. The racks 7 are slidably matched with the support plate 5. Through this result, during the reciprocating movement of the racks 7 relative to the support plate 5, the meshing of the racks 7 and the gear 9 can drive the connecting rod 6 to rotate along a single direction, and the connecting rod 6 and the cover plate 11 are cooperated through a limiting unit, so that the connecting rod 6 can move outward relative to the syringe barrel 1 during the rotation process relative to the cover plate 11, which is beneficial to driving the plug head 603 to move away from the needle tube relative to the syringe barrel 1.

[0034] The positioning unit includes a positioning bar 12 fixedly connected to the inner wall of the collar 8. A positioning groove 601 slidably engaged with the positioning bar 12 is formed on the outer peripheral wall of the connecting rod 6. The positioning groove 601 is arranged along the axial direction of the connecting rod 6. With this structure, when the collar 8 rotates, the connecting rod 6 can be driven to rotate through the cooperation between the positioning bar 12 and the positioning groove 601. At the same time, the connecting rod 6 can move along its axial direction relative to the collar 8.

[0035] The limiting unit includes a limiting block 1101 fixedly connected to the cover plate 11. A through hole adapted to the connecting rod 6 is formed at the central position of the cover plate 11. The limiting block 1101 is fixedly arranged on the inner wall of the through hole. A limiting groove 602 slidably engaged with the limiting block 1101 is formed on the outer peripheral wall of the connecting rod 6. The limiting groove 602 is arranged in a spiral shape. With this structure, during the process of the collar 8 driving the connecting rod 6 to rotate synchronously, the connecting rod 6 can be driven to move relative to the syringe barrel 1 through the extrusion force of the limiting groove 602 on the limiting block 1101.

[0036] The width of the above-mentioned limiting groove 602 is greater than the width of the positioning groove 601, so that the limiting block 1101 will not interfere with the positioning groove 601 during the process of sliding along the limiting groove 602, and the limiting groove 602 is communicated with the positioning groove 601.

[0037] In order to drive the rack 7 to move, in this solution, cantilevers 2 are hinged to both sides of the top of the support plate 5. A slide bar 4 is arranged below the cantilever 2. Referring to Figures 1 - 3 as shown, the slide bar 4 can slide along its length direction relative to the support plate 5, and the slide bar 4 and the rack 7 are fixedly connected by a support column, so that the slide bar 4 can drive the rack 7 to move synchronously during the movement. A slider 401 is fixedly arranged on the top surface of the slide bar 4, and a chute 202 slidably engaged with the slider 401 is formed on the cantilever 2 along its length direction. With this structure, when the cantilever 2 deflects, the slide bar 4 and the rack 7 can be driven to move relative to the support plate 5 through the pressure of the side surface of the chute 202 on the slider 401, and the connecting rod 6 can be driven to rotate through the cooperation between the rack 7 and the gear 9;

[0038] Referring to Figure 3 as shown, the above-mentioned rack 7 is arranged on both sides of the gear 9. In actual use, in order to simplify the structure, the rack 7 can be arranged only on one side of the gear 9. Specifically, the cantilever 2 cooperating with the rack 7 can be rotatably engaged with the support plate 5, and the other cantilever 2 can be fixedly connected to the support plate 5.

[0039] One end of the cantilever 2 away from the syringe barrel 1 is integrally formed with a ring-shaped holding part. During the actual operation, medical staff can insert their fingers into the holding part to drive the deflection of the cantilever 2. Specifically, one hand of the medical staff operates the cantilever 2, and the other hand can pick up the medicine bottle, so that the syringe needle is inserted into the medicine bottle. Then, drive the cantilever 2 to deflect inwards. Through the cooperation between the chute 202 and the slider 401, the slide bar 4 can be driven to move away from the connecting rod 6. During this process, the rack 7 will engage with the gear 9 and drive the gear 9 and the collar 8 to rotate forward. Thus, through the cooperation between the positioning bar 12 and the positioning groove 601, the connecting rod 6 can be driven to rotate, and through the cooperation between the spiral limiting groove 602 and the limiting block 1101, the connecting rod 6 can be urged to move outwards relative to the syringe barrel 1, so as to suck the liquid medicine in the medicine bottle into the syringe barrel 1 by using the plug 603. When driving the two cantilevers 2 to deflect outwards, the rack 7 will move towards the connecting rod 6, thereby driving the gear 9 to rotate in the reverse direction. Since the gear 9 can only drive the collar 8 to rotate in a single direction, during the process of the cantilever 2 deflecting outwards, the gear 9 is in a state of rotating alone. Repeating the above operation, during the process of the medical staff driving the cantilever 2 to deflect reciprocally, the gear 9 can drive the collar 8 and the connecting rod 6 to rotate in a single direction, thereby continuously driving the plug 603 to move away from the syringe needle. Compared with the traditional syringe, this device is convenient for single-handed operation, so that the liquid medicine in the medicine bottle can be quickly extracted.

[0040] As Figures 1 - 10 shown, a pressing plate 3 is rotatably installed at the top end face of the connecting rod 6, and convex portions 301 are integrally formed on both sides of the top surface of the pressing plate 3. During the process of injecting the liquid medicine into the patient's body, the medical staff can place the index finger and the middle finger on both sides of the bottom of the support plate 5, and place the thumb on the top surface of the pressing plate 3 and between the two convex portions 301. During the process of pressing down the pressing plate 3, the connecting rod 6 can move towards the inside of the syringe barrel 1, so as to squeeze out the liquid medicine in the syringe barrel 1 through the plug 603. Specifically, during the process of the connecting rod 6 moving towards the inside of the syringe barrel 1, although the connecting rod 6 can be rotated through the cooperation between the limiting block 1101 and the limiting groove 602, due to the rotational cooperation between the pressing plate 3 and the connecting rod 6, during the injection of the liquid medicine, the pressing plate 3 can be kept stable through the cooperation between the two convex portions 301 and the thumb of the medical staff, thereby improving the stability of the injected liquid medicine.

[0041] Further, a circular hole is formed at the bottom end face of the pressing plate 3 and near the center. A part of the connecting rod 6 near the top extends into the circular hole. An elastic clamping block 10 is installed on the outer peripheral wall of the connecting rod 6. Refer to Figure 7As shown, the end face of the clamping block 10 away from the connecting rod 6 is provided with an inclined surface 1001, and a clamping groove 302 matching the clamping block 10 is opened on the inner wall of the circular hole. After the clamping block 10 is in the ejected state and inserted into the clamping groove 302, the connecting rod 6 and the pressing plate 3 can be locked;

[0042] An installation hole is opened on the top wall inside the circular hole, and a pull rod 604 is fixedly arranged on the top end face of the connecting rod 6. The cross sections of the part of the pull rod 604 away from the connecting rod 6 and the installation hole are both T-shaped, and one end of the pull rod 604 away from the connecting rod 6 is rotatably arranged in the installation hole. Through this structure, the pressing plate 3 and the connecting rod 6 can be rotationally matched, and the pressing plate 3 and the connecting rod 6 will not separate. A limiting spring 13 is arranged between the connecting rod 6 and the top surface inside the circular hole, and the limiting spring 13 is sleeved outside the pull rod 604;

[0043] During the injection process, the thumb of the medical staff is placed between the two convex parts 301 and drives the pressing plate 3 to move downward. During this process, the limiting spring 13 between the pressing plate 3 and the connecting rod 6 will be compressed, so that the pressing plate 3 can move relative to the connecting rod 6 along its length direction. However, due to the resistance of the limiting spring 13, the clamping block 10 and the clamping groove 302 do not coincide on the horizontal plane. When the moving speed of the pressing plate 3 pushed by the medical staff suddenly increases, using the resistance of the liquid medicine in the syringe 1 to the plug 603, the pressing plate 3 can further compress the limiting spring 13 and move downward relative to the connecting rod 6, so that the clamping block 10 can be aligned with the clamping groove 302. After the clamping block 10 is inserted into the clamping groove 302, the connecting rod 6 and the pressing plate 3 are locked, so that the connecting rod 6 cannot rotate relative to the pressing plate 3 any more. Since the thumb of the medical staff is located between the two convex parts 301, the pressing plate 3 and the connecting rod 6 cannot rotate. When the connecting rod 6 cannot be driven to rotate through the cooperation of the limiting block 1101 and the limiting groove 602, the connecting rod 6 cannot move downward relative to the syringe 1 any more, which is beneficial to avoiding the liquid medicine being quickly pushed into the patient's body. Subsequently, when the thumb of the medical staff gradually leaves the pressing plate 3, the pressing plate 3 can move away from the connecting rod 6 and reset. Since one end of the clamping block 10 is provided with an inclined surface 1001, when the pressing plate 3 moves away from the connecting rod 6, the clamping block 10 can move out of the clamping groove 302, so that the pressing plate 3 can slowly push the connecting rod 6 and the plug 603 again. Therefore, using this structure can inject the liquid medicine into the patient's body more safely.

[0044] As Figure 1As shown, in order to install the cantilever 2, two bosses 501 are integrally formed on one side of the support plate 5 close to the cantilever 2. A plug rod 5011 is fixedly arranged on the top surface of the boss 501, and an annular plug-in part 201 is integrally formed on the cantilever 2, so that the plug rod 5011 is inserted into the plug-in part 201 and is rotationally matched with the plug-in part 201. The plug-in part 201 is roughly located at the middle position of the cantilever 2.

[0045] An arc-shaped spring is installed between the two cantilevers 2. The two cantilevers 2 can be urged to deflect outwards through the arc-shaped spring. Figure 3 As shown, the part of the inner side of the rack 7 close to the slide bar 4 is a smooth structure. When the liquid medicine extraction is completed and the cantilever 2 is in a non-held state, the arc-shaped spring can drive the cantilever 2 to deflect outwards and remain stable, so that the gear 9 is located at the smooth structure on the side of the rack 7, thus avoiding the gear 9 from meshing with the rack 7, and making the gear 9 and the rack 7 not interfere with each other during the process of pressing the pressing plate 3.

[0046] Referring to Figure 2 As shown, guide grooves 503 are formed at both ends of the slide bar 4 on the top surface of the support plate 5. Guide blocks that are slidably matched with the guide grooves 503 are fixedly arranged on both sides of the bottom surface of the slide bar 4. Of course, the cross-sections of the guide blocks and the guide grooves 503 can both be set to be T-shaped.

[0047] A strip-shaped groove 502 is formed on the top surface of the support plate 5. The strut fixed between the rack 7 and the slide bar 4 slides in the strip-shaped groove 502.

[0048] Referring to Figure 4 As shown, the length of the positioning strip 12 is greater than the pitch of the limiting groove 602, so that the positioning strip 12 will not disengage from the positioning groove 601.

[0049] Combined with Figures 3 - 4 、 Figure 6 As shown, a stepped hole 505 is formed at the center position of the support plate 5. The connecting rod 6 passes through the stepped hole 505 and can move freely relative to the support plate 5. The above-mentioned collar 8 and gear 9 are both installed in the stepped hole 505. Specifically, the top end faces of the collar 8 and the gear 9 are both in contact with the inner top wall of the stepped hole 505, and the bottom end faces of the collar 8 and the gear 9 are both in contact with the top surface of the cover plate 11. Through this structure, the stability of the collar 8 and the gear 9 can be maintained. An installation groove 504 communicating with the stepped hole 505 is formed on the support plate 5. The installation groove 504 communicates with the above-mentioned strip-shaped groove 502. The rack 7 slides in the installation groove 504, and a T-shaped groove is formed on the inner wall of the installation groove 504. A clamping strip 701 with a T-shaped cross-section is fixedly arranged on the side of the rack 7 close to the T-shaped groove. The clamping strip 701 slides in the T-shaped groove.

[0050] Refer to Figure 7 As shown, a groove that slidably cooperates with the latch 10 is provided on the outer peripheral wall of the connecting rod 6, and a first spring is fixedly provided between the inner end face of the groove and the latch 10.

[0051] Refer to Figures 10 - 11 As shown, during actual operation, the collar 8 and the gear 9 can be cooperated through a one-way bearing, so that the gear 9 can only drive the collar 8 to rotate in a single direction. In this solution, another implementation manner is given. A rectangular groove is provided on the outer peripheral wall of the collar 8, and a protrusion 801 is slidably arranged in the rectangular groove. A second spring is fixedly provided between the protrusion 801 and the inner end face of the rectangular groove. One end of the protrusion 801 away from the collar 8 is provided with an inclined pressing surface 8011, and a plurality of notches 901 that cooperate with the protrusion 801 are provided on the inner wall of the gear 9. Through this structure, the one-way cooperation between the collar 8 and the gear 9 can also be achieved.

[0052] The cross-section of the portion of the connecting rod 6 close to the plug 603 is T-shaped, and a circular hole that cooperates with the bottom end of the connecting rod 6 is provided at the top of the plug 603. Similarly, the cross-section of the circular hole is T-shaped, so that the bottom end portion of the connecting rod 6 can be rotatably arranged in the circular hole.

Claims

1. A medical syringe, comprising a syringe barrel, a cover plate is fixedly arranged at one end of the syringe barrel, a support plate is arranged on the side of the cover plate away from the syringe barrel, a plug is slidably arranged inside the syringe barrel, and a connecting rod is arranged at one end of the plug close to the cover plate, and is characterized in that: A part of the connecting rod near the top passes through the support plate. A collar is sleeved outside the connecting rod. The collar can drive the connecting rod to rotate synchronously through the positioning unit, and the connecting rod can move along its axis relative to the collar during the rotation process; A gear is sleeved outside the collar. The gear can rotate along a single direction relative to the collar. A rack meshing with the gear is slidably assembled on the support plate. During the reciprocating movement of the rack relative to the support plate, the engagement between the rack and the gear can drive the connecting rod to rotate along a single direction. The connecting rod and the cover plate are cooperated through a limiting unit, so that the connecting rod can move along the axis direction of the syringe barrel during the rotation relative to the cover plate; The positioning unit includes a positioning strip fixedly connected to the inner wall of the collar. A positioning groove slidably matched with the positioning strip is opened on the outer peripheral wall of the connecting rod. The positioning groove is arranged along the axis direction of the connecting rod; The limiting unit includes a limiting block fixedly connected to the cover plate. A through hole matched with the connecting rod is opened at the center position of the cover plate. The limiting block is fixedly arranged at the inner wall of the through hole. A limiting groove slidably matched with the limiting block is opened on the outer peripheral wall of the connecting rod. The limiting groove is arranged in a spiral shape; Both sides of the top of the support plate are hinged with cantilevers. A slide bar is arranged below the cantilevers. The slide bar is slidably matched with the support plate, and the slide bar and the rack are fixedly connected through a pillar. A slider is fixedly arranged on the top surface of the slide bar. A chute slidably matched with the slider is opened on the cantilever; A pressing plate is rotatably installed at the top end face of the connecting rod, and the pressing plate is elastically cooperated with the connecting rod. Two convex portions are integrally formed on both sides of the top surface of the pressing plate; A circular hole is opened at the bottom end face of the pressing plate and near the center. A part of the connecting rod near the top extends into the circular hole. A clamping block is elastically installed on the outer peripheral wall of the connecting rod. The end face of the clamping block away from the connecting rod is set as an inclined plane. A clamping groove matched with the clamping block is opened at the inner wall of the circular hole.

2. The medical syringe according to claim 1, wherein: An installation hole is opened at the top inner wall of the circular hole. A pull rod is fixedly arranged at the top end face of the connecting rod. The cross sections of the part of the pull rod away from the connecting rod and the installation hole are both set as T-shaped. One end of the pull rod away from the connecting rod is rotatably arranged in the installation hole. A limiting spring is arranged between the connecting rod and the top inner surface of the circular hole.

3. A medical syringe according to claim 2, characterized in that: Two bosses are integrally formed on one side of the support plate close to the cantilever. A plug rod is fixedly arranged on the top surface of the boss. A ring-shaped plugging portion is integrally formed on the cantilever, so that the plug rod is inserted into the plugging portion and is rotatably matched with the plugging portion.

4. A medical syringe according to claim 1, characterized in that: An arc spring is installed between the two cantilevers.

5. A medical syringe according to claim 1, wherein: The width of the limiting groove is greater than the width of the positioning groove, and the limiting groove is communicated with the positioning groove.

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