Anti-stabbing syringe

Abstract

The invention relates to the field of medical instruments, in particular to an anti-stabbing syringe which comprises a needle head, a needle cylinder and a piston pusher slidably arranged in the needle cylinder, the needle head is arranged at the end of the needle cylinder through a limiting structure, a connecting part is arranged at one end of the piston pusher, and the piston pusher can be connected with the needle head through the connecting part. The needle is driven to slide in the needle cylinder; after the needle head finishes injection, the piston pusher pushed to the bottom can be connected with the needle head, and the needle head can slide into the needle cylinder for isolation by pulling back the piston pusher, so that the needle head is prevented from stabbing medical staff; and the piston pusher is inserted into the needle cylinder from one end of the needle cylinder in a sliding manner, and the needle head can be taken out by pulling out the piston pusher, so that the subsequent treatment of the syringe is more convenient, and the risk that medical personnel are punctured by the needle head is reduced.

Description

Technical Field

[0001] The invention relates to the field of medical devices, and in particular provides a stab-proof syringe. Background Art

[0002] Nurses are the group of medical personnel who are most frequently exposed to blood and body fluids. Their needlestick injuries mainly occur when performing injection or blood collection operations, as well as in the process of handling syringes after the operation. Cases of nurses being infected with blood-borne diseases due to being stabbed by contaminated needles have been reported from time to time. Therefore, needlestick injuries from syringes have become an important problem of occupational injuries for nurses, seriously threatening the health and safety of nurses. At present, there are related patents to improve traditional syringes, such as Chinese patents CN04288870A and CN105056346, which are all provided with a sleeve outside the injection syringe, and the sleeve is removed to cover the needle after the injection is completed. Although this setting can temporarily isolate the needle and the user after the syringe is used, in the subsequent syringe handling link, the entire needle can only be thrown into the sharps box together with other components such as the syringe and the piston, like the traditional syringe, which increases the cost of use. If the needle is to be separated and processed, the protection of the sleeve needs to be removed before the force division operation of the needle can be performed, which is also prone to stabbing the operator. Therefore, a syringe that is easy to handle and can provide puncture protection is needed. Summary of the invention

[0003] The present invention aims to provide a stab-proof syringe to solve the problem in the prior art that a used syringe is prone to accidentally injure medical personnel and is inconvenient for subsequent treatment.

[0004] The technical solution of the present invention is as follows:

[0005] A stab-proof syringe comprises a needle, a syringe and a piston pusher slidably arranged in the syringe, wherein the needle is arranged at the end of the syringe through a limiting structure, and a connecting part is arranged at one end of the piston pusher. The piston pusher can be connected to the needle through the connecting part and drive the needle to slide in the syringe.

[0006] In this solution, after the injection is completed, the piston pusher can be connected to the needle as it is pushed to the bottom. Pulling back the piston pusher can make the needle slide into the syringe for isolation, preventing the needle from injuring medical staff. And because the piston pusher is slid into the syringe from one end of the syringe, the needle can be taken out by pulling out the piston pusher. After the needle is taken out, it can be directly separated from the sharps box by holding the piston pusher, making the subsequent handling of the syringe more convenient and reducing the risk of medical staff being injured by the needle.

[0007] Preferably, the limiting structure includes a sliding channel with a closed end and a snap-in groove at the end of the syringe, the needle includes a needle tip and a needle seat, the needle seat is provided with a liquid channel connected to the interior of the syringe, the needle seat is slidably arranged on the sliding channel, and the needle seat is provided with a snap-in piece that matches the snap-in groove.

[0008] After the needle is connected to the piston pusher, it can enter the syringe together with the piston pusher. In this solution, the needle is positioned at the end of the syringe by the needle seat. When the clamping piece of the needle seat is clamped on the clamping groove, when the syringe is working, a certain degree of support force is provided for the needle to prevent the needle from being forced to retreat when inserted into the target. At the same time, it can also position the needle seat, so that the needle seat and the end of the syringe form a seal.

[0009] Preferably, the snap-fit ​​plates are arranged in a circular array on the side wall of the sliding seat, and the snap-fit ​​plates are elastic.

[0010] In this solution, multiple snap-in plates can make the needle more stably arranged at the end of the syringe. In order to ensure that the snap-in plate of the needle seat can be disengaged from the snap-in groove when needed and allow the needle to be retracted into the syringe, the snap-in plate is elastic. When the force exerted by the piston pusher on the needle seat along the axis of the syringe increases, the snap-in plate can be deformed to a certain extent and then disengaged from the snap-in groove, allowing the needle seat to slide in the sliding channel.

[0011] On the one hand, since the elastic snap-in piece can undergo a certain deformation, in order to ensure that when the needle is subjected to a force in the direction of the syringe, the snap-in piece will not be deformed due to too small a force, preferably, the snap-in piece is bent toward the bottom of the needle, that is, the snap-in piece forms a trumpet shape with its opening facing the center of the syringe, which can greatly increase the force required for the snap-in piece to deform when it moves downward.

[0012] On the other hand, since the clip is set to a curved structure, it will be more laborious to pull the needle directly downward to deform the clip. To solve this problem, preferably, the needle seat includes a positioning seat and a sliding seat, the positioning seat is slidably connected to the sliding seat, and an elastic unit is arranged between the positioning seat and the sliding seat. In this scheme, since the clip is bent, a force is directly applied to the clip toward the center of the syringe, and the force required to deform the clip is much greater than the force applied to the clip away from the center of the syringe, so the sliding seat is allowed to have space to slide upward relative to the positioning seat, and the positioning seat is supported by the elastic unit. The sliding seat with the clip is moved upward by pushing the piston pusher, and the clip is first deformed and no longer limited by the clip groove, and then the entire needle is pulled into the syringe by the piston pusher.

[0013] Preferably, the connecting part includes a suction cup structure arranged at the piston end of the piston pusher, and the bottom end of the sliding seat is provided with an adsorption surface. In this solution, after the piston pusher completely pushes out the medicine, the piston end just contacts with the adsorption surface arranged at the bottom end of the sliding seat and adsorbs the sliding seat.

[0014] Since the needle needs to be connected to the syringe, and the suction cup structure of the piston pusher is too large, it will cover the through hole of the needle, resulting in no negative pressure in the piston structure, and thus the piston pusher cannot be connected to the needle. This situation may not be avoided. A blocking column is provided in the liquid channel of the positioning seat through a support rod, and a through hole connected to the liquid channel is provided in the middle of the adsorption surface. The diameter of the blocking column is adapted to the aperture of the through hole. When the sliding seat slides toward the positioning seat, the blocking column can block the through hole. After the blocking column can block the through hole, a negative pressure structure is formed in the area where the suction cup structure is adsorbed on the adsorption surface.

[0015] Preferably, the snap-in slot is formed by the upper slot and the lower slot, and the slot corner of the upper slot is rounded. By setting the rounded corner, the sliding friction of the snap-in piece when it moves upward and deforms can be smoother.

[0016] Preferably, the lower part of the groove is an acute-angle protrusion. After the clamping piece is deformed, the needle seat is pulled downward, so that the end of the clamping piece does not interfere with the lower part of the groove, so that the entire needle can be pulled into the syringe more smoothly.

[0017] Preferably, a sealing gasket is provided between the needle seat and the closing end of the sliding channel to ensure the sealing of the contact position between the end of the syringe and the needle.

[0018] Beneficial effects of the present invention:

[0019] During the injection process of the present invention, as the piston pusher is pushed to the bottom, it can be connected with the needle, and pulling back the piston pusher can make the needle slide into the syringe for isolation, thereby preventing the needle from stabbing medical personnel; and because the piston pusher is slidably inserted into the syringe from one end of the syringe, the needle can be taken out by pulling out the piston pusher, thereby making the subsequent handling of the syringe more convenient and reducing the risk of medical personnel being stabbed by the needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic cross-sectional view of the present invention;

[0022] Figure 2It is a schematic diagram of the present invention when the needle is freed from the limit between the needle and the syringe;

[0023] Figure 3 This is a schematic diagram of the needle of the present invention after being stored;

[0024] Figure 4 For the present invention Figure 1 The enlarged view of point A in the middle;

[0025] Figure 5 For the present invention Figure 2 The enlarged view of point B in the middle;

[0026] Figure 6 is a cross-sectional view of a needle of the present invention;

[0027] Figure 7 It is a schematic diagram of another embodiment of the present invention.

[0028] In the above drawings, the corresponding reference numerals are as follows:

[0029] 1-needle, 11-needle tip, 12-needle seat, 121-liquid channel, 122-clamping piece, 123-positioning seat, 124-sliding seat, 125-elastic unit, 126-adsorption surface, 127-support rod, 128-blocking column, 129-through hole, 13-sealing gasket, 2-syringe, 21-sliding channel, 22-clamping groove, 221-groove upper part, 222-groove lower part, 3-piston pusher, 31-connecting part, 311-suction cup structure, 312-clamping ring, 313-opening. DETAILED DESCRIPTION

[0030] In conjunction with the accompanying drawings, the technical solution of the present invention is clearly and completely described through the specific implementation methods of the embodiments of the present invention.

[0031] Embodiment 1:

[0032] like Figure 1 The stab-proof syringe shown comprises a needle 1, a syringe 2 and a piston pusher 3 slidably arranged in the syringe 2. The needle 1 is arranged at the end of the syringe 2 through a limiting structure. A connecting portion 31 is arranged at one end of the piston pusher 3. The piston pusher 3 can be connected to the needle 1 through the connecting portion 31 and drive the needle 1 to slide in the syringe 2.

[0033] Specifically, Figures 1 to 6As shown, the limiting structure includes a sliding channel 21 with a closed end and a snap-in groove 22 at the end of the syringe 2, the needle 1 includes a needle tip 11 and a needle seat 12, the needle seat 12 is provided with a liquid channel 121 communicating with the inside of the syringe 2, the needle seat 12 is slidably arranged on the sliding channel 21, and a snap-in piece 122 adapted to the snap-in groove 22 is arranged on the needle seat 12, the needle seat 12 is positioned at the end of the syringe 2 through the snap-in groove 22, and a sealing gasket 13 is arranged between the needle seat 12 and the closed end of the sliding channel 21 to ensure the sealing of the contact position between the end of the syringe 2 and the needle 1. The snap-in piece 122 is elastic, and a plurality of snap-in pieces 122 are arranged in a circumferential array on the side wall of the sliding seat 124. When the clamping piece 122 of the needle seat 12 is clamped on the clamping groove 22, when the syringe is working, a certain degree of support force is provided for the needle 1 to prevent the needle 1 from being forced to retreat when inserted into the target, and at the same time, the needle seat 12 can be positioned so that the needle seat 12 and the closing end of the syringe 2 form a seal, and multiple clamping pieces 122 can make the needle 1 more stably arranged at the end of the syringe 2. In order to ensure that the clamping piece 122 of the needle seat 12 can be disengaged from the clamping groove 22 when needed, so that the needle 1 can be withdrawn into the syringe 2, the clamping piece 122 is elastic, and when the force exerted by the piston pusher 3 on the needle seat 12 along the axis direction of the syringe 2 becomes larger, such as Figure 2 and Figure 5 As shown, the engaging piece 122 can be deformed to a certain extent, thereby disengaging from the engaging groove 22 , so that the needle seat 12 can slide in the sliding channel 21 .

[0034] Further, such as Figure 4 As shown, the snap-in piece 122 is bent toward the bottom of the needle 1, that is, the snap-in piece 122 forms a trumpet shape with its opening facing the center of the syringe 2. This arrangement greatly increases the force required for the snap-in piece 122 to deform when it moves downward, ensuring that when the needle 1 is subjected to a force in the direction of the syringe 2, the snap-in piece 122 will not be deformed due to too small a force.

[0035] Furthermore, since the locking piece 122 is set to a bent structure, it becomes more laborious to directly pull the needle 1 downward to deform the locking piece 122. To solve this problem, preferably, the needle seat 12 includes a positioning seat 123 and a sliding seat 124, and the positioning seat 123 is slidably connected to the sliding seat 124, and an elastic unit 125 is provided between the positioning seat 123 and the sliding seat 124. In this scheme, since the locking piece 122 is bent, a force is directly applied to the locking piece 122 toward the center direction of the syringe 2. The force required to deform the locking piece 122 is much greater than the force applied to the locking piece 122 away from the center direction of the syringe 2. Therefore, the sliding seat 124 with the locking piece 122 is moved upward by pushing the piston pusher 3, so that the locking piece 122 is first deformed and no longer limited by the locking groove 22, and then the entire needle 1 is pulled into the syringe 2 by the piston pusher 3.

[0036] It should be noted that if Figure 4 and Figure 5 As shown, the engaging groove 22 is enclosed by an upper groove portion 221 and a lower groove portion 222, and the groove corner of the upper groove portion 221 is rounded. By setting the rounded corner, the sliding friction of the engaging piece 122 when it moves upward and deforms can be smoother, and the lower groove portion 222 is an acute-angle protrusion. After the engaging piece 122 is deformed, the needle seat 12 is pulled down, so that the end of the engaging piece 122 does not interfere with the lower groove portion 222, so that the entire needle 1 can be pulled into the syringe 2 more smoothly.

[0037] In this embodiment, the specific use process of the present invention is as follows: in the initial state, like a common syringe, the piston pusher 3 is against the needle 1, and the needle seat 12 of the needle 1 is also fixed to the end of the syringe 2 by the clamping piece 122. After opening the conventional needle 1 cover, pull the piston pusher 3 backward to absorb the injection liquid into the syringe 2; after the injection liquid is absorbed, insert the needle 1 into the target position. At this time, due to the limit of the clamping piece 122 and the pressure of the liquid in the syringe 2 on the needle 1 seat, it is ensured that the needle 1 will not slide during insertion. Figure 1 As shown; then, the injection liquid is pushed out by pressing the piston pusher 3 in a conventional manner. When the piston pusher 3 contacts the sliding seat 124, the injection is completed. While pulling out the needle 1, the piston pusher 3 is continued to be pressed, so that the sliding seat 124 moves upward with the end of the clamping piece 122, the elastic unit 125 is compressed, and the clamping piece 122 is deformed. After the piston pusher 3 is pushed to the bottom, the piston pusher 3 is connected to the needle seat 12 of the needle 1 through the connecting portion 31 as shown in FIG. Figure 2 As shown; finally, Figure 3 As shown, by pulling the piston pusher 3 in the opposite direction, the needle 1 can slide into the syringe 2 along with the piston pusher 3, effectively preventing the needle tip 11 of the needle 1 from accidentally injuring medical personnel. When handling the syringe later, the needle 1 can be directly pulled out of the syringe 2 along with the piston pusher 3 to separate the needle 1, the syringe 2 and the piston pusher 3, and only the needle 1 can be put into the sharps box, and the rest can be put into the medical waste bin or recycled in other ways, which effectively protects and avoids stabbing medical personnel, and greatly facilitates subsequent processing.

[0038] Embodiment 2:

[0039] This embodiment provides a structure of a connecting portion 31 based on the first embodiment, such as Figure 4 and Figure 5As shown, the connection part 31 includes a suction cup structure 311 disposed at the piston end of the piston pusher 3, and an adsorption surface 126 is disposed at the bottom end of the sliding seat 124. After the piston pusher 3 completely pushes out the medicine, the piston end just contacts the adsorption surface 126 disposed at the bottom end of the sliding seat 124 and adsorbs the sliding seat 124. It should be noted that the suction cup structure 311 can be one or more suction cups disposed on the side of the piston end of the piston pusher 3 facing the needle 1, and the adsorption area of ​​the suction cup cannot include the outlet of the needle seat 12 connecting the needle tip 11 and the through hole 129 of the syringe 2, so as to ensure that the suction cup can connect the piston pusher 3 with the needle 1 through negative pressure adsorption.

[0040] However, in order to ensure a simpler structure and reduce manufacturing costs, the suction cup structure 311 on the piston pusher 3 preferably uses a single large suction cup, but this is likely to cover the through hole 129 of the needle 1, resulting in the piston structure being unable to perform negative pressure adsorption. Figure 6 As shown, a blocking column 128 is provided in the liquid channel 121 of the positioning seat 123 through a support rod 127, and a through hole 129 communicating with the liquid channel 121 is provided in the middle of the adsorption surface 126. The diameter of the blocking column 128 is adapted to the aperture of the through hole 129. When the sliding seat 124 slides toward the positioning seat 123, the blocking column 128 can block the through hole 129. After the blocking column 128 can block the through hole 129, a negative pressure structure is formed in the area where the suction cup structure 311 is adsorbed on the adsorption surface 126.

[0041] Embodiment three:

[0042] The difference between this embodiment and the second embodiment is that the connection portion 31 structure used in this embodiment is not a suction cup structure 311, but a Figure 7 As shown, a circle of snap ring 312 protrudes from the end of the piston terminal, and a circle of snap protrusions is arranged on the outer wall of the snap ring 312, and the snap protrusions are semicircular protrusions. The corresponding bottom of the needle seat 12 has an opening 313 adapted to the outer diameter of the snap ring 312, and the inner wall of the opening 313 is provided with a groove adapted to the snap protrusions. The snap ring 312 achieves an interference fit with the opening 313 through the snap protrusions. And the needle seat 12 is slidably arranged on the sliding channel 21 as a whole, and is also fixed to the end of the syringe 2 by the snap sheet 122 on the outer wall of the needle seat 12 and the snap groove 22 at the end of the syringe 2.

[0043] In this embodiment, after the injection of the syringe is completed, the piston pusher 3 contacts the needle seat 12, and after the needle 1 is pulled out, the clamping ring 312 can be pushed into the opening 313 with force, and the clamping protrusion of the clamping ring 312 and the groove on the inner wall of the opening 313 are mutually limited, so that the piston pusher 3 is connected to the needle seat 12. Compared with the second embodiment in which the suction cup is used to connect the piston pusher 3 and the needle seat 12, the arrangement structure in this embodiment is more sophisticated and has lower difficulty in production injection molding.

[0044] It should be noted that a through hole 129 is provided at the connection position between the clamping ring 312 and the end of the piston terminal. The through hole 129 connects the inner side and the outer side of the clamping ring 312 to ensure that when the piston pusher 3 is pushed to inject the medicine, the medicine liquid on the outer side of the clamping ring 312 can be discharged as much as possible, thereby reducing waste and improving injection accuracy.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention.

Claims

1. A stab-proof syringe, comprising a needle (1), a syringe (2) and a piston pusher (3) slidably arranged in the syringe (2), characterized in that: The needle (1) is arranged at the end of the syringe (2) via a limiting structure, and a connecting portion (31) is arranged at one end of the piston pusher (3). The piston pusher (3) can be connected to the needle (1) via the connecting portion (31) and drive the needle (1) to slide in the syringe (2).

2. The stab-proof syringe according to claim 1, characterized in that: The limiting structure comprises a sliding channel (21) with a closed end and a snap-in groove (22) at the end of the syringe (2); the needle (1) comprises a needle tip (11) and a needle seat (12); a liquid channel (121) communicating with the interior of the syringe (2) is provided in the needle seat (12); the needle seat (12) is slidably arranged on the sliding channel (21); and a snap-in piece (122) adapted to the snap-in groove (22) is provided on the needle seat (12).

3. The stab-proof syringe according to claim 2, characterized in that: The clamping pieces (122) are arranged in a circumferential array on the side wall of the sliding seat (124), and the clamping pieces (122) are elastic.

4. The stab-proof syringe according to claim 3, characterized in that: The engaging piece (122) is bent toward the bottom of the needle (1).

5. The stab-proof syringe according to claim 4, characterized in that: The needle seat (12) comprises a positioning seat (123) and a sliding seat (124); the positioning seat (123) is slidably connected to the sliding seat (124); and an elastic unit (125) is provided between the positioning seat (123) and the sliding seat (124).

6. The stab-proof syringe according to claim 5, characterized in that: The connecting portion (31) comprises a suction cup structure (311) arranged at the piston end of the piston pusher (3), and the bottom end of the sliding seat (124) is provided with an adsorption surface (126).

7. The stab-proof syringe according to claim 6, characterized in that: A blocking column (128) is arranged in the liquid channel (121) of the positioning seat (123) through a support rod (127); a through hole (129) connected to the liquid channel (121) is arranged in the middle of the adsorption surface (126); the diameter of the blocking column (128) is adapted to the aperture of the through hole (129); when the sliding seat (124) slides toward the positioning seat (123), the blocking column (128) can block the through hole (129).

8. The stab-proof syringe according to claim 3, characterized in that: The clamping groove (22) is formed by enclosing a groove upper portion (221) and a groove lower portion (222), and the groove corner of the groove upper portion (221) is a rounded corner.

9. The stab-proof syringe according to claim 8, characterized in that: The groove lower portion (222) is an acute-angle protrusion.

10. The stab-proof syringe according to claim 2, characterized in that: A sealing gasket (13) is provided between the needle seat (12) and the closing end of the sliding channel (21).

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