Syringe

Abstract

The utility model relates to the technical field of injectors, in particular to an injector which comprises an injection cylinder, a needle seat is connected to the bottom of the interior of the injection cylinder in a clamped mode, a limiting groove is formed in the middle of the top of the needle seat, a limiting piece is installed in the limiting groove, and a locking plate inclining outwards is arranged on the limiting piece. A piston rod is movably inserted into the syringe, a mounting rod is fixedly connected to the bottom of the piston rod, and a clamping piece is fixedly connected to the bottom of the mounting rod; the clamping piece comprises an inserting rod, the top of the inserting rod is fixedly connected to the bottom of the mounting rod, a circular truncated cone rod is fixedly connected to the bottom of the inserting rod, and a locking groove is formed in the connecting position of the inserting rod and the circular truncated cone rod. According to the utility model, the needle tube can be pulled into the syringe, so that the syringe is physically damaged and cannot be reused, the possibility that the syringe is repeatedly used is reduced, and the risk of cross infection caused by repeated use is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of syringes, in particular to a syringe. Background Art

[0002] Syringes are commonly used medical devices to inject liquids or gases into patients' body tissues. Common syringes on the market generally include a syringe barrel, a needle tube and a piston rod. During the medical process, the syringe directly contacts the patient's blood, tissue fluid and other body fluids. These body fluids contain various viruses, bacteria and other pathogens. If the syringe is reused after use, the pathogens will be transmitted to the next user through the syringe, which will cause serious consequences of cross-infection of infectious diseases. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the utility model provides a syringe that can pull the needle tube into the syringe barrel, physically destroying the syringe so that it cannot be used again, reducing the possibility of the syringe being reused, and thereby reducing the risk of cross infection caused by reuse.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a syringe, comprising a syringe, wherein a needle seat is clamped at the bottom of the syringe, a limiting groove is provided in the middle of the top of the needle seat, a limiting member is installed in the limiting groove, and a locking plate inclined outward is provided on the limiting member;

[0005] A piston rod is movably inserted into the interior of the injection cylinder, a mounting rod is fixedly connected to the bottom of the piston rod, and a clamping piece is fixedly connected to the bottom of the mounting rod;

[0006] The clamping member includes an insertion rod, the top of the insertion rod is fixedly connected to the bottom of the mounting rod, the bottom of the insertion rod is fixedly connected to a truncated cone rod, a locking groove is provided at the connection between the insertion rod and the truncated cone rod, and the locking plate is adapted to the locking groove.

[0007] Furthermore, the limiting member includes a limiting plate, the outer wall of the limiting plate is fixedly connected to the inner wall of the limiting groove, and a socket is provided in the middle of the limiting plate; the outer diameter of the frustum rod gradually decreases in the direction away from the insertion rod, the maximum outer diameter of the frustum rod is equal to the outer diameter of the insertion rod, and the inner diameter of the socket is larger than the maximum outer diameter of the frustum rod.

[0008] Furthermore, there are multiple locking plates, and the tops of the multiple locking plates are fixedly connected to the inner wall of the socket at equal intervals in a circle, and the end of the locking plate away from the limiting plate is tilted downward.

[0009] Furthermore, the limiting plate is provided with a plurality of strip grooves equidistantly around the circumference, the strip grooves are connected to the insertion holes, and the strip grooves are provided between the two locking plates.

[0010] Further, the outer wall of the mounting rod is provided with a flange, the middle outer diameter of the flange is greater than the outer diameter of the upper and lower two ends, the outer wall of the flange is sleeved with a rubber plug, and the outer wall of the rubber plug is in sliding connection with the inner wall of the injection cylinder.

[0011] Further, the piston rod is provided with a convex ring, the outer diameter of the convex ring is greater than the inner diameter of the rubber plug, and the top of the rubber plug abuts against the bottom of the convex ring.

[0012] Further, the middle part of the needle seat is embedded with a needle tube, the top of the needle tube is in communication with the bottom of the limiting groove, the bottom of the needle tube passes through the needle seat and extends to the bottom of the injection cylinder, and the bottom of the needle tube is provided with a sharp needle head.

[0013] Further, the lower part of the injection cylinder is a small cylinder, the middle part of the injection cylinder is an intermediate cylinder, the upper part of the injection cylinder is a large cylinder, the lower end of the small cylinder of the injection cylinder is provided in an open manner, the outer wall of the small cylinder of the injection cylinder is sleeved with a sheath, the inner diameter of the sheath is equal to the outer diameter of the small cylinder of the injection cylinder, and the part, where the needle tube extends out of the needle seat, is located in the interior of the sheath.

[0014] Further, the inner wall of the connecting part between the upper part of the small cylinder of the injection cylinder and the lower part of the intermediate cylinder is provided with an annular groove, the needle seat comprises an upper cylinder and a lower cylinder, the outer diameter of the lower cylinder is smaller than that of the upper cylinder, a sealing ring is sleeved between the connecting part between the upper cylinder and the lower cylinder of the needle seat, and the sealing ring is matched with the annular groove in the injection cylinder.

[0015] Further, the upper outer diameter of the upper part of the lower cylinder of the needle seat is greater than the outer diameter of the lower part, the lower cylinder of the needle seat is in sliding connection with the inner wall of the small cylinder of the injection cylinder, the upper outer diameter of the upper part of the upper cylinder of the needle seat is greater than the outer diameter of the lower part, and the upper cylinder of the needle seat is in sliding connection with the inner wall of the intermediate cylinder of the injection cylinder.

[0016] By means of the above technical scheme, the injection device provided by the utility model has at least the following beneficial effects:

[0017] 1、in the utility model, the injection device can realize the locking between the clamping part and the limiting part when completing the injection, when the injection device completes the injection, pulling the piston rod upward will cause the needle seat and the needle tube to be pulled into the injection cylinder, which physically damages the injection device and makes it unable to be used again, thereby reducing the possibility of repeated use of the injection device and reducing the cross-infection risk caused by repeated use.

[0018] 2. In the present invention, when the piston rod moves downward, the bottom of the conical rod will be inserted into the socket. The outer diameter of the conical rod is gradually reduced, so that the conical rod will squeeze the inner wall of the locking plate during the insertion process, causing the locking plate to deform outward. Then the conical rod continues to move downward, and the locking plate will slide into the locking groove and return to its original state, achieving a smooth transition. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0020] Figure 1 This is a schematic diagram of the structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the limiter of the utility model;

[0022] Figure 3 This is a schematic diagram of the card firmware structure of the utility model.

[0023] In the figure: 1. Syringe; 2. Needle seat; 3. Limiting groove; 4. Limiting member; 41. Limiting plate; 42. Insertion hole; 43. Locking plate; 44. Strip groove; 5. Piston rod; 6. Mounting rod; 7. Clamping member; 71. Insertion rod; 72. Conical rod; 73. Locking groove; 8. Rubber plug; 9. Raised ring; 10. Needle tube; 11. Sealing ring; 12. Sheath. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 3 A syringe comprises a syringe barrel 1, a needle seat 2 being clamped at the bottom of the syringe barrel 1, a limiting groove 3 being provided in the middle of the top of the needle seat 2, a limiting member 4 being installed inside the limiting groove 3, a fixing groove for installing the limiting member 4 being provided inside the limiting groove 3, the limiting member 4 being bonded in the fixing groove, and a locking plate 43 being provided on the limiting member 4 which is inclined outwards;

[0026] A piston rod 5 is movably inserted into the interior of the syringe 1, a mounting rod 6 is fixedly connected to the bottom of the piston rod 5, and a clamping piece 7 is fixedly connected to the bottom of the mounting rod 6;

[0027] The clamping member 7 includes an insert rod 71, the top of which is fixedly connected to the bottom of the mounting rod 6. The bottom of the insert rod 71 is fixedly connected to a conical rod 72. A locking groove 73 is provided at the connection between the insert rod 71 and the conical rod 72, and the locking plate 43 is adapted to fit within the locking groove 73. When the syringe is used to complete an injection, the clamping member 7 and the retaining member 4 are locked. When the syringe is used to complete an injection, pulling the piston rod 5 upward causes the needle seat 2 and the needle tube 10 to be pulled into the syringe barrel 1, physically destroying the syringe and making it unusable. This reduces the possibility of the syringe being reused, thereby reducing the risk of cross-infection caused by reuse.

[0028] The limiting member 4 includes a limiting plate 41, the outer wall of which is fixedly connected to the inner wall of the limiting groove 3, and a socket 42 is provided in the middle of the limiting plate 41. The outer diameter of the conical rod 72 gradually decreases in the direction away from the insertion rod 71, and the maximum outer diameter of the conical rod 72 is equal to the outer diameter of the insertion rod 71. The inner diameter of the socket 42 is larger than the maximum outer diameter of the conical rod 72. When the piston rod 5 moves downward, the bottom of the conical rod 72 is inserted into the socket 42. Due to the setting of the gradually decreasing outer diameter of the conical rod 72, the conical rod 72 squeezes the inner wall of the locking plate 43 during the insertion process, causing the locking plate 43 to deform outward. Then, the conical rod 72 continues to move downward, and the locking plate 43 slides into the locking groove 73 and returns to its original state, achieving a smooth transition.

[0029] There are multiple locking plates 43, each of which is fixedly attached to the inner wall of the insertion hole 42 at equal intervals around the circumference. The end of the locking plate 43 away from the stop plate 41 is tilted downward. The tilt of the locking plate 43 facilitates smooth insertion of the conical rod 72 into the insertion hole 42 and guides the conical rod 72 downward to avoid obstruction during insertion.

[0030] The limiting plate 41 is provided with a plurality of strip-shaped grooves 44 equidistantly spaced around the circumference. The strip-shaped grooves 44 communicate with the insertion hole 42 and are located between the two locking plates 43. The provision of the strip-shaped grooves 44 provides additional elastic space for the locking plates 43. When the frustum rod 72 is inserted into the insertion hole 42, the strip-shaped grooves 44 allow the locking plates 43 to elastically deform within a certain range, facilitating the locking plates 43 to snap into the locking grooves 73, thereby enhancing the stability and reliability of the locking.

[0031] The outer wall of the mounting rod 6 is provided with a flange, the outer diameter of the flange being larger than the outer diameters of the upper and lower ends. The outer wall of the flange is provided with a rubber plug 8, and the outer wall of the rubber plug 8 is slidably connected to the inner wall of the syringe barrel 1. When the rubber plug 8 is mounted on the flange, a tight fit is formed, thereby enhancing the secure installation of the rubber plug 8.

[0032] A convex ring 9 is provided on the piston rod 5 , the outer diameter of the convex ring 9 is larger than the inner diameter of the rubber plug 8 , the top of the rubber plug 8 abuts against the bottom of the convex ring 9 , and the setting of the convex ring 9 plays a positioning effect for the installation of the rubber plug 8 .

[0033] A needle tube 10 is embedded in the middle of the needle seat 2. The top of the needle tube 10 is connected to the bottom of the limiting groove 3, which can ensure that the drug solution flows smoothly from the syringe 1 into the needle tube 10. The bottom of the needle tube 10 passes through the needle seat 2 and extends to the bottom of the syringe 1. A sharp needle head is provided at the bottom of the needle tube 10.

[0034] The lower part of the syringe 1 is a small cylinder, the middle part of the syringe 1 is an intermediate cylinder, and the upper part of the syringe 1 is a large cylinder. The lower end of the small cylinder of the syringe 1 is open, and the outer wall of the small cylinder of the syringe 1 is provided with a sheath 12. The inner diameter of the sheath 12 is equal to the outer diameter of the small cylinder of the syringe 1. The part where the needle tube 10 extends out of the needle seat 2 is located inside the sheath 12. The sheath 12 wraps the part where the needle tube 10 extends out of the needle seat 2, thereby protecting the needle tube 10.

[0035] An annular groove is provided on the inner wall of the connection between the upper part of the small cylinder and the lower part of the middle cylinder of the injection barrel 1. The needle seat 2 includes an upper cylinder and a lower cylinder. The outer diameter of the lower cylinder is smaller than the outer diameter of the upper cylinder. A sealing ring 11 is provided at the connection between the upper cylinder and the lower cylinder of the needle seat 2. The sealing ring 11 cooperates with the annular groove in the injection barrel 1, and the sealing between the injection barrel 1 and the needle seat 2 is enhanced by the sealing ring 11.

[0036] The upper outer diameter of the lower cylinder of the needle seat 2 is larger than the outer diameter of the lower part, and the lower cylinder of the needle seat 2 is slidably connected to the inner wall of the small cylinder of the injection barrel 1. The upper outer diameter of the upper cylinder of the needle seat 2 is larger than the outer diameter of the lower part, and the upper cylinder of the needle seat 2 is slidably connected to the inner wall of the middle cylinder of the injection barrel 1. The tight sliding connection between the needle seat 2 and the injection barrel 1 helps to seal to a certain extent and prevent the drug solution from leaking from the connection between the two; and when self-destruction is performed, it can ensure that the needle seat 2 slides upward in the injection barrel 1 more smoothly.

[0037] Working principle: During injection, as the piston rod 5 moves downward, the conical rod 72 will be inserted into the socket 42 on the limit plate 41, and the outer wall of the conical rod 72 will squeeze the locking plate 43, causing the locking plate 43 to deform outward. Then the conical rod 72 will continue to move downward, and the locking plate 43 will slide into the locking groove 73 and return to its original state, thereby achieving locking between the clamping piece 7 and the limit piece 4.

[0038] When self-destroying, the piston rod 5 is pulled upward, the needle seat 2 is moved upward by the clamping piece 7, the needle tube 10 is pulled into the syringe 1, the syringe is physically damaged and cannot be used again, the possibility of repeated use of the syringe is reduced, and the cross infection risk caused by repeated use is reduced.

[0039] It should be noted that the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, so that a process, method, article or apparatus that comprises a list of elements not only includes those elements, but also includes other elements not expressly listed or inherent to such process, method, article or apparatus.

[0040] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A syringe comprising a syringe barrel (1), characterized in that: The bottom of the injection barrel (1) is clamped with a needle seat (2), the middle of the top of the needle seat (2) is provided with a limiting groove (3), the inside of the limiting groove (3) is installed with a limiting member (4), and the limiting member (4) is provided with a locking plate (43) inclined outwards; A piston rod (5) is movably inserted into the interior of the injection cylinder (1), a mounting rod (6) is fixedly connected to the bottom of the piston rod (5), and a clamping piece (7) is fixedly connected to the bottom of the mounting rod (6); The clamping member (7) comprises an inserting rod (71), the top of the inserting rod (71) is fixedly connected to the bottom of the mounting rod (6), the bottom of the inserting rod (71) is fixedly connected to a truncated cone rod (72), a locking groove (73) is provided at the connection between the inserting rod (71) and the truncated cone rod (72), and the locking plate (43) is adapted to the locking groove (73).

2. The syringe according to claim 1, characterized in that: The limiting member (4) comprises a limiting plate (41), the outer wall of the limiting plate (41) is fixedly connected to the inner wall of the limiting groove (3), and a plug hole (42) is provided in the middle of the limiting plate (41); the outer diameter of the truncated cone rod (72) gradually decreases in a direction away from the insertion rod (71), the maximum outer diameter of the truncated cone rod (72) is equal to the outer diameter of the insertion rod (71), and the inner diameter of the plug hole (42) is greater than the maximum outer diameter of the truncated cone rod (72).

3. The syringe according to claim 2, characterized in that: There are multiple locking plates (43), and the tops of the multiple locking plates (43) are fixedly connected to the inner wall of the insertion hole (42) at equal distances in a circle. The locking plate (43) is tilted downward at one end away from the limiting plate (41).

4. The syringe according to claim 3, characterized in that: The limiting plate (41) is provided with a plurality of strip grooves (44) at equal intervals in a circumferential manner. The strip grooves (44) are communicated with the insertion holes (42). The strip grooves (44) are provided between the two locking plates (43).

5. The syringe according to claim 1, wherein: The outer wall of the mounting rod (6) is provided with a flange, the middle outer diameter of the flange is larger than the outer diameters of the upper and lower ends, the outer wall of the flange is sleeved with a rubber plug (8), and the outer wall of the rubber plug (8) is slidably connected to the inner wall of the injection barrel (1).

6. The syringe according to claim 5, characterized in that: The piston rod (5) is provided with a convex ring (9), the outer diameter of the convex ring (9) is larger than the inner diameter of the rubber plug (8), and the top of the rubber plug (8) abuts against the bottom of the convex ring (9).

7. The syringe according to claim 1, wherein: A needle tube (10) is embedded in the middle of the needle seat (2), the top of the needle tube (10) is connected to the bottom of the limiting groove (3), the bottom of the needle tube (10) passes through the needle seat (2) and extends to the bottom of the injection barrel (1), and a sharp needle head is provided at the bottom of the needle tube (10).

8. The syringe according to claim 7, characterized in that: The lower part of the syringe (1) is a small cylinder, the middle part of the syringe (1) is an intermediate cylinder, and the upper part of the syringe (1) is a large cylinder. The lower end of the small cylinder of the syringe (1) is open, and the outer wall of the small cylinder of the syringe (1) is covered with a sheath (12). The inner diameter of the sheath (12) is equal to the outer diameter of the small cylinder of the syringe (1), and the part of the needle tube (10) extending out of the needle seat (2) is located inside the sheath (12).

9. The syringe according to claim 8, characterized in that: An annular groove is provided on the inner wall of the connection between the upper part of the small cylinder and the lower part of the middle cylinder of the injection barrel (1); the needle seat (2) comprises an upper cylinder and a lower cylinder; the outer diameter of the lower cylinder is smaller than the outer diameter of the upper cylinder; a sealing ring (11) is provided at the connection between the upper cylinder and the lower cylinder of the needle seat (2); the sealing ring (11) cooperates with the annular groove in the injection barrel (1).

10. The syringe according to claim 9, characterized in that: The outer diameter of the upper portion of the lower cylinder of the needle seat (2) is greater than the outer diameter of the lower portion, and the lower cylinder of the needle seat (2) is slidably connected to the inner wall of the small cylinder of the injection barrel (1). The outer diameter of the upper portion of the upper cylinder of the needle seat (2) is greater than the outer diameter of the lower portion, and the upper cylinder of the needle seat (2) is slidably connected to the inner wall of the middle cylinder of the injection barrel (1).

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