A medical safety self-retracting puncture needle

Abstract

The present invention discloses a medical safety self-retracting puncture needle, which solves the problem that the existing puncture needle is equipped with a separate needle cap, the needle cap is easy to lose, the needle tip is unprotected after the puncture is completed, and it is easy to cause clinical puncture injuries. In addition, when recycling, the puncture needle needs to be collected separately, which increases the burden and cost of medical device recycling. The present invention includes a sheath, a needle seat and a needle tube. Through holes are opened at both ends of the sheath. The needle seat is located in the sheath and one end of the needle seat extends out of the sheath. The other end of the needle seat is connected to the needle tube. An elastic member is arranged between the needle seat and the sheath. The elastic member is arranged in parallel and in the same direction as the needle tube. When the elastic member is in a natural state, the needle tube is located in the sheath. When the elastic member is in a compressed state, the needle tube extends out of the sheath. The present invention has the advantages of preventing clinical puncture injuries, convenient puncture needle recycling, and labor-saving operation.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a medical safety self-retracting puncture needle. Background Art

[0002] In clinical medicine, puncture needles are often used for dispensing medicines or puncturing. However, most of the commonly used puncture needles now have a needle cap on the puncture end of the puncture needle. When puncture is needed, the needle cap is removed and separated from the puncture needle, which is easy to lose. Moreover, after the puncture is completed, the needle tip may accidentally injure the patient or medical staff. When the puncture needle is recovered, it is also necessary to remove the puncture needle separately and recover it separately, which brings trouble to the handling of the medical device and may cause the risk of being stabbed.

[0003] It is necessary to improve the problems existing in the current puncture needles. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing puncture needle is equipped with a separate needle cap, which is easy to lose. After the puncture is completed, the needle tip is unprotected and can easily cause clinical puncture injuries. Moreover, when recycling, the puncture needle needs to be collected separately, which increases the burden and cost of medical device recycling.

[0005] The present invention provides a medical safety self-retracting puncture needle for solving the above-mentioned problem.

[0006] The present invention is achieved through the following technical solutions:

[0007] A medical safety self-retracting puncture needle comprises a sheath, a needle seat and a needle tube, through holes are provided at both ends of the sheath, the needle seat is located in the sheath and one end of the needle seat extends out of the sheath, the other end of the needle seat is connected to the needle tube, an elastic member is provided between the needle seat and the sheath, the elastic member is arranged parallel to and in the same direction as the needle tube and is limited between the needle seat and the sheath, when the elastic member is in a natural state, the needle tube is located in the sheath, and when the elastic member is in a compressed state, the needle tube can extend out of the sheath.

[0008] The present invention arranges the needle tube and the needle seat in the sheath. When not in use, the needle tube is located in the sheath for protection and will not injure the human body. When in use, the needle seat is pushed to move in the sheath to drive the needle tube to extend out of the sheath for puncture. In the process of pushing the needle seat, the elastic member is compressed, and the elastic member generates a restoring force accordingly. As the needle seat continues to advance, the elastic member is compressed more strongly, and the restoring force generated is greater. After the puncture is completed, the operator stops applying thrust to the needle seat, and the needle seat and the needle tube automatically rebound under the action of the restoring force of the elastic member, thereby achieving self-retraction after the puncture is completed. The puncture needle is always protected by the sheath when not in puncture, thereby avoiding clinical punctures. During recycling, there is no need to handle the needle tube separately.

[0009] The present invention preferably provides a medical safety self-retracting puncture needle, wherein the elastic member is a spring, the spring coaxially surrounds the needle tube and one end of the spring is fixed to the needle seat, the diameter of the spring is larger than the size of the through hole of the sheath close to the puncture end, when the needle seat is pushed to move in the sheath, the spring is compressed in the limited space between the needle seat and the sheath, and the needle tube passes through the spring, so the operator's force is not easily offset, and the operation is easier.

[0010] The preferred medical safety self-retracting puncture needle of the present invention has a magnet disposed on the side wall of the sheath, the magnet being close to the puncture end, and a magnetized body magnetically attracted to the magnet being disposed on the needle seat.

[0011] When the needle seat is pushed to move in the sheath, the elastic part is gradually compressed in the limited space between the needle seat and the sheath, and the restoring force generated is gradually increased. In addition, as the needle tube enters the puncture body, puncture resistance is generated. Therefore, as the needle seat continues to be pushed forward, the operator is required to do more work and apply greater force to overcome the increase in the restoring force of the elastic part and the puncture resistance. The distance between the magnet provided in the present invention and the magnetized body is gradually reduced during the advancement of the needle seat, and the magnetic force is increased, which helps the operator save effort and facilitates the puncture operation.

[0012] The present invention is preferably a medical safety self-retracting puncture needle, wherein an elastic step is provided at one end of the sheath contacting the elastic member, the elastic step and the sheath side wall connected to the elastic step are provided with a cavity, a magnet is provided in the cavity of the sheath side wall, the magnet separates the cavity into cavity one and cavity two, the cavity one is filled with a hard filler, the cavity two is filled with an elastic filler, and a magnet is provided on the needle seat that is magnetically attracted to the magnet.

[0013] When the needle seat is pushed in, the spring will gradually squeeze the elastic step, and the cavity one will be squeezed, so that the internal hard filler moves into the cavity of the side wall of the sheath, squeezing the magnet, and the magnet moves in the direction of the magnet, while squeezing the elastic filler at the other end of the magnet. Since the distance between the magnet and the magnet gradually decreases, the magnetic force of mutual attraction increases, and there is a pulling force in the puncture direction on the needle seat, which is beneficial to the advancement of the needle seat and saves the force used by people to push the needle seat. When the puncture is completed, the thrust on the needle seat is stopped, and the needle seat will rebound quickly under the action of the restoring force of the elastic part, and the squeezing of the elastic step by the spring is released, the elastic step rebounds, the space of cavity one increases, and the magnet moves back in the direction of the elastic step under the action of the resilience of the elastic filler in cavity two, and pushes the hard filler in cavity one to move, and finally the magnet and the filler return to their initial positions.

[0014] Furthermore, an inclined surface is provided on one side of the cavity close to the sleeve port, and the inclined surface is an arc surface. When the spring squeezes the elastic step, the hard filler can move better along the inclined surface under the action of the squeezing force, which facilitates the movement of the magnet.

[0015] The present invention is preferably a medical safety self-retracting puncture needle, wherein a spring ring with a variable diameter is arranged at the proximal puncture end of the spring, and the diameter of the spring ring gradually increases from close to the puncture end to away from the puncture end. In the process of advancing the needle seat, the small-diameter spring ring at the end of the spring first squeezes the end of the elastic step of the sheath, and then the gradually variable-diameter spring ring gradually squeezes the elastic step toward the side wall of the sheath, thereby making it easier for the hard filler in the cavity of the elastic step to move toward the cavity of the side wall, so that the hard filler can more smoothly push the magnet to move.

[0016] The present invention preferably provides a medical safety self-retracting puncture needle, wherein an annular protrusion is provided on the needle seat, one end of the elastic member is provided on one side of the annular protrusion, and the other end of the elastic member extends along the needle tube direction, and the annular protrusion serves to limit the elastic member.

[0017] The present invention is preferably a medical safety self-retracting puncture needle, wherein a magnet is arranged on the annular protrusion, so that the lateral distance between the magnet and the magnet can be reduced, which is beneficial to increase the suction force between the two and saves the operator's force in pushing the needle seat.

[0018] Furthermore, the magnets are distributed in a ring shape in the side wall of the sheath, and the magnetized body is distributed in a ring shape at the end of the annular protrusion. The magnetic force between the magnets and the magnetized body helps the needle seat to always be located in the middle of the sheath, reducing or eliminating the friction generated by the inclination of the needle seat and the sheath, which is beneficial to the smooth and continuous advancement of the needle seat.

[0019] Furthermore, the spring is made of iron, so that the magnet has magnetic force on the spring. The spring surrounds the needle tube and is distributed in the middle of the sheath. The magnetic force of the magnet on the spring helps the spring to always be in the middle of the sheath, reducing the possibility of its deflection, which is conducive to smooth and accurate puncture of the needle tube.

[0020] The present invention is preferably a medical safety self-retracting puncture needle, wherein the magnet is iron or magnet 2.

[0021] The preferred medical safety self-retracting puncture needle of the present invention has the hard filler being polytetrafluoroethylene balls.

[0022] The preferred medical safety self-retracting puncture needle of the present invention has the elastic filler being silica gel particles or polyurethane particles.

[0023] In a preferred medical safety self-retracting puncture needle of the present invention, the elastic step is made of rubber or thermoplastic elastic material.

[0024] The present invention preferably provides a medical safety self-retracting puncture needle, wherein the proximal puncture end of the sheath is configured as a cone with a hole in the middle, the elastic member is in a natural state, the needle tube is located in the cone, and when the needle seat is pushed, the needle tube extends out of the cone and the elastic member is compressed.

[0025] The present invention has the following beneficial effects:

[0026] 1. The present invention provides an elastic member in the same direction as the needle tube between the needle seat and the sheath. In a normal state, the needle tube is located in the sheath. In a puncture state, the needle tube extends out of the sheath and performs puncture. After the puncture is completed, the needle tube automatically retracts under the action of the restoring force of the elastic member, thereby effectively avoiding clinical puncture injuries and facilitating the recovery and disposal of the puncture needle.

[0027] 2. The present invention arranges a magnet on the side wall of the sheath near the puncture end, and arranges a magnetized body that attracts each other on the needle seat. During the process of pushing the needle seat, the force between the magnet and the magnetized body gradually increases, which is beneficial to overcome the restoring force of the spring and the resistance generated by the puncture, saving manpower and facilitating operation.

[0028] 3. The magnet of the present invention is arranged in a cavity, and the displacement of the magnet is achieved by squeezing the filler in the cavity, so that the distance between the magnet and the magnetized object is reduced faster, and the speed of increasing the magnetic force is also accelerated, which is beneficial to overcome the restoring force of the spring and the resistance generated by puncture during the advancement of the needle seat, saving manpower and facilitating operation.

[0029] 4. A spring ring with a variable diameter is arranged at the near puncture end of the spring of the present invention, and the diameter of the spring ring gradually increases from the direction close to the puncture end to the direction away from the puncture end. In the process of pushing the needle seat, the small-diameter spring ring at the end of the spring first squeezes the end of the elastic step of the sheath, and then the spring ring with a gradually variable diameter gradually squeezes the elastic step toward the side wall of the sheath, thereby making it easier for the filler in the cavity of the elastic step to move toward the cavity of the side wall, so that the movement of the magnet is smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of Example 1 of the present invention under normal conditions.

[0032] Figure 2 This is a schematic diagram of the structure of Example 1 of the present invention in the puncture state.

[0033] Figure 3 This is a schematic diagram of the structure of Example 3 of the present invention in a normal state.

[0034] Figure 4 This is a schematic diagram of the structure of Example 3 of the present invention in the puncture state.

[0035] Marks and corresponding parts names in the attached drawings:

[0036] 1-sheath, 2-needle seat, 3-needle tube, 4-spring, 5-puncture body, 6-elastic step, 7-cavity one, 8-cavity two, 9-magnet, 10-hard filler, 11-elastic filler, 12-annular protrusion, 13-magnetized body, 14-convex ring, 15-pressing seat, 16-inclined surface, 17-cone. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0038] Example 1

[0039] like Figure 1 and Figure 2 As shown, a medical safety self-retracting puncture needle comprises a sheath 1, a needle seat 2 and a needle tube 3, through holes are opened at both ends of the sheath 1, the needle seat 2 is located in the sheath 1 and one end of the needle seat 2 extends out of the sheath 1, and the other end of the needle seat 2 is connected to the needle tube 3, an elastic member is arranged between the needle seat 2 and the sheath 1, and the elastic member is arranged parallel to and in the same direction as the needle tube 3, when the elastic member is in a natural state, the needle tube 3 is located in the sheath 1, and when the elastic member is in a compressed state, the needle tube 3 extends out of the sheath 1.

[0040] The present invention arranges the needle tube 3 and the needle seat 2 in the sheath 1. When not in use, the needle tube 3 is located in the sheath 1 for protection and will not injure the human body. When puncturing the puncture body 5, the needle seat 2 is pushed to move in the sheath 1, thereby driving the needle tube 3 to extend out of the sheath 1 for puncturing. In the process of pushing the needle seat 2, the elastic member is compressed, and the elastic member generates a restoring force accordingly. As the needle seat 2 continues to advance, the elastic member is compressed more severely, and the restoring force generated is greater. After the puncture is completed, the operator stops applying thrust to the needle seat 2, and the needle seat 2 and the needle tube 3 automatically rebound under the action of the restoring force of the elastic member, thereby achieving self-retraction when the puncture is completed. The puncture needle is always protected by the sheath 1 when not puncturing, avoiding clinical punctures. During the recycling process, there is no need to handle the needle tube 3 separately.

[0041] The elastic member is a spring 4, which coaxially surrounds the needle tube 3 and one end of the spring 4 is fixed to the needle seat 2. The diameter of the spring 4 is larger than the through hole size of the sheath 1 close to the puncture end. When the needle seat 2 is pushed to move in the sheath 1, the spring 4 is compressed in the limited space between the needle seat 2 and the sheath 1, and the needle tube 3 passes through the spring 4. It is not easy for the operator to deviate when applying force, and it is easier to operate.

[0042] The needle seat 2 is provided with an annular protrusion 12, one end of the elastic member is arranged on one side of the annular protrusion 12, and the other end of the elastic member extends along the direction of the needle tube 3. The annular protrusion 12 has a limiting effect on the elastic member.

[0043] An annular step is provided at one end of the sheath 1 close to the puncture, and the annular step serves to limit the spring 4, and the needle tube 3 can pass through the through hole formed by the annular step.

[0044] A cone 17 with a hole in the middle is provided on the annular step. When the elastic member is in a natural state, the needle tube 3 is located in the cone 17 . When the needle seat 2 is pushed in, the elastic member is compressed and the needle tube 3 extends out of the cone 17 .

[0045] The end of the sheath 1 away from the puncture is provided with a convex ring 14 perpendicular to the side wall thereof, and the convex ring 14 serves to limit the annular protrusion 12 to prevent the needle seat 2 from being separated from the sheath 1 .

[0046] A pressing seat 15 is provided at one end of the needle seat 2 extending out of the sheath 1. The diameter of the pressing seat 15 is larger than the diameter of the through hole formed by the convex ring 14 of the sheath 1, so as to limit the advancement of the needle seat 2 and prevent the needle seat 2 from being excessively advanced.

[0047] Example 2

[0048] The difference between this embodiment and embodiment 1 is that a magnet 9 is provided on the side wall of the sheath 1 , the magnet 9 is close to the puncture end, and a magnetized body 13 magnetically attracted to the magnet 9 is provided on the needle seat 2 .

[0049] When the needle seat 2 is pushed to move in the sheath 1, the elastic member is gradually compressed in the limited space between the needle seat 2 and the sheath 1, and the restoring force generated is gradually increased. In addition, as the needle tube 3 enters the puncture body 5, resistance is generated. Therefore, as the needle seat 2 continues to be pushed forward, the operator is required to do more work and apply more force to overcome the increase in the restoring force of the elastic member and the increase in puncture resistance. The distance between the magnet 9 and the magnetized body 13 provided in the present invention gradually decreases during the advancement of the needle seat 2, and the magnetic force is increased, which helps the operator save effort and facilitates the puncture operation.

[0050] The magnets 9 are distributed in a ring shape in the side wall of the sheath 1, and the magnetized body 13 is distributed in a ring shape at the end of the annular protrusion 12. The magnetic force of the magnets 9 and the magnetized body 13 helps the needle seat 2 to always be located in the middle of the sheath 1, reducing or eliminating the friction force generated by the inclination of the needle seat 2 and the sheath 1, which is beneficial to the smooth and continuous advancement of the needle seat 2.

[0051] The magnetized body 13 is a second magnet 9 , and the facing ends of the magnet 9 and the second magnet 9 have different polarities, so that the two generate a mutual attraction rather than a repulsive force.

[0052] The hard filler 10 is a polytetrafluoroethylene ball. The surface of polytetrafluoroethylene is smooth and can be easily moved due to extrusion.

[0053] The elastic filler 11 is silica gel particles or polyurethane particles.

[0054] The elastic step 6 is made of a thermoplastic elastic material, and the thermoplastic elastic material is polyurethane.

[0055] Example 3

[0056] like Figure 3 and Figure 4 As shown, the difference between this embodiment and embodiment 2 is that an elastic step 6 is provided at one end of the sheath 1 contacting the elastic member, and a cavity is provided on the elastic step 6 and the side wall of the sheath 1 connected to the elastic step 6, and a magnet 9 is provided in the cavity of the side wall of the sheath 1, and the magnet 9 divides the cavity into cavity one 7 and cavity two 8, the cavity one 7 is filled with a hard filler 10, and the cavity two 8 is filled with an elastic filler 11, and a magnet 13 magnetically attracted to the magnet 9 is provided on the needle seat 2.

[0057] When the needle seat 2 is pushed forward, the spring 4 will gradually squeeze the elastic step 6, and the cavity 1 7 will be squeezed, so that the internal hard filler 10 moves into the cavity of the side wall of the sheath 1, squeezing the magnet 9. The magnet 9 moves toward the magnetized body 13 and squeezes the elastic filler 11 at the other end of the magnet 9. Since the distance between the magnet 9 and the magnetized body 13 gradually decreases, the magnetic force of mutual attraction increases, and there is a force in the puncture direction on the needle seat 2, which is beneficial to the advancement of the needle seat 2 and saves the force used by people to push the needle seat 2. When the puncture is completed, the thrust applied to the needle seat 2 is stopped, and the needle seat 2 will rebound quickly under the action of the restoring force of the elastic member, and the squeezing of the elastic step 6 by the spring 4 is released, the elastic step 6 rebounds, and the space of the cavity 1 7 increases. Under the action of the resilience of the elastic filler 11 in the cavity 2 8, the magnet 9 moves back in the direction of the elastic step 6 and pushes the hard filler 10 in the cavity 1 7 to move, and finally the magnet 9 and the filler return to their initial positions.

[0058] During the advancement of the needle seat 2, the distance between the magnet 9 and the magnetized body 13 is always kept within the distance range where the magnetic force increases, so as to prevent the two magnets from being too close to cause the magnetic force to disappear or to generate a magnetic force in the opposite direction.

[0059] An inclined surface 16 is provided on one side of the cavity 7 close to the end of the sheath 1. The inclined surface 16 is an arc surface. When the spring 4 squeezes the elastic step 6, the hard filler 10 can move better along the inclined surface 16 under the action of the squeezing force, so as to facilitate the movement of the magnet 9.

[0060] A spring 4 ring of variable diameter is provided at the puncture end near the spring 4, and the diameter of the spring 4 ring gradually increases from the puncture end to the direction away from the puncture end. In the process of advancing the needle seat 2, the small-diameter spring 4 ring at the end of the spring 4 first squeezes the end of the elastic step 6 of the sheath 1, and then the spring 4 ring of gradually variable diameter gradually squeezes the elastic step 6 toward the side wall of the sheath 1, thereby making it more conducive to the filler in the cavity of the elastic step 6 to move toward the cavity of the side wall, so that the movement of the magnet 9 is smoother.

[0061] The annular protrusion 12 is provided with a magnetized body 13 , which can reduce the lateral distance between the magnetized body 13 and the magnet 9 , thereby increasing the suction force between the two and saving the operator's force in pushing the needle seat 2 .

[0062] Example 4

[0063] The difference between this embodiment and embodiment 3 is that the spring 4 is made of iron, so that the magnet 9 has a magnetic force on the spring 4. The spring 4 surrounds the needle tube 3 and is distributed in the middle of the sheath 1. The magnetic force of the magnet 9 on the spring 4 helps the spring 4 to always be in the middle of the sheath 1, reducing the possibility of its deflection, which is beneficial to the smooth and accurate puncture of the needle tube 3.

[0064] Example 5

[0065] The difference between this embodiment and embodiment 3 is that a cavity three is arranged at the free end of the annular protrusion 12, a magnet 9 is arranged in the cavity three, the free end of the annular protrusion 12 is arranged as a structure with a hole, and the side wall of the sheath 1 provided with the magnet 9 is also provided with a hole, so that the barrier layer can reduce the resistance to the magnetic force.

[0066] Example 6

[0067] The difference between this embodiment and embodiment 3 is that the annular protrusion 12 is made of iron, which is conducive to the magnet 9 generating magnetic force thereon.

[0068] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A medical safety self-retracting puncture needle, It is characterized in that The invention comprises a sheath (1), a needle seat (2) and a needle tube (3), wherein through holes are provided at both ends of the sheath (1), the needle seat (2) is located in the sheath (1) and one end of the needle seat (2) extends out of the sheath (1), and the other end of the needle seat (2) is connected to the needle tube (3), an elastic member is arranged between the needle seat (2) and the sheath (1), the elastic member and the needle tube (3) are arranged in parallel and in the same direction and are limited between the needle seat (2) and the sheath (1), when the elastic member is in a natural state, the needle tube (3) is located in the sheath (1), and when the elastic member is in a compressed state, the needle tube (3) can extend out of the sheath (1); An elastic step (6) is provided at one end of the sheath (1) contacting the elastic member, the elastic step (6) and the side wall of the sheath (1) connected to the elastic step (6) are provided with a cavity, a magnet (9) is provided in the cavity of the side wall of the sheath (1), the magnet (9) divides the cavity into a first cavity (7) and a second cavity (8), the first cavity (7) is filled with a hard filler (10), the second cavity (8) is filled with an elastic filler (11), and a magnet (13) that is magnetically attracted to the magnet (9) is provided on the needle seat (2); The elastic member is a spring (4), and the spring (4) is made of iron.

2. A medical safety self-retracting puncture needle according to claim 1, It is characterized in that The spring (4) coaxially surrounds the needle tube (3) and one end of the spring (4) is fixed on the needle seat (2). The diameter of the spring (4) is larger than the size of the through hole of the sheath (1) close to the puncture end.

3. A medical safety self-retracting puncture needle according to claim 1 or 2, It is characterized in that The side wall of the sheath (1) is provided with a magnet (9), the magnet (9) is close to the puncture end, and the needle seat (2) is provided with a magnetized body (13) magnetically attracted to the magnet (9).

4. A medical safety self-retracting puncture needle according to claim 2, It is characterized in that A spring (4) ring with a variable diameter is arranged near the puncture end of the spring (4), and the diameter of the spring (4) ring gradually increases from the direction close to the puncture end to the direction away from the puncture end.

5. A medical safety self-retracting puncture needle according to any one of claims 1, 2 or 4, It is characterized in that An annular protrusion (12) is provided on the needle seat (2), one end of the elastic member is provided on one side of the annular protrusion (12), and the other end of the elastic member extends along the direction of the needle tube (3).

6. A medical safety self-retracting puncture needle according to claim 5, It is characterized in that A magnet (13) is provided on the annular protrusion (12).

7. A medical safety self-retracting puncture needle according to claim 3, It is characterized in that The magnetized body (13) is iron or a second magnet.

8. A medical safety self-retracting puncture needle according to claim 1, It is characterized in that The hard filler (10) is polytetrafluoroethylene balls, and the elastic filler (11) is silica gel particles or polyurethane particles.

9. A medical safety self-retracting puncture needle according to claim 1, It is characterized in that The material of the elastic step (6) is rubber or thermoplastic elastic material.

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