Remaining needle with all-plastic needle tip stopping structure
Through the fully plastic needle tip stop structure, the combination of micro flanges, connectors, stop eccentric blocks and stop lock blocks is solved, and the operation inconvenience caused by bare needle tips in the prior art is achieved, and the safe covering of the needle tip and Improved operation accuracy and stability.
Patent Information
- Application Number
- CN202420556071.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-03-21
AI Technical Summary
After puncture, the needle tip exposed in the existing safety indwelling needle will cause inconvenient operation and difficult to accurately control, affecting the safety of medical staff.
A fully plastic needle tip stop structure is designed, including micro flanges, connectors, stop eccentric blocks and stop lock blocks, which enable complete coverage of the needle tip through these components, ensuring that the needle tip is not exposed and simplifying the operating handle. design to improve operational accuracy and stability.
The safe cover of the needle tip is achieved to avoid harm to medical staff, and improve operational convenience and accuracy by simplifying the appearance size and length.
Smart Images
Figure CN222304523U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a needle device for introducing a medium into a blood vessel, in particular to an indwelling needle with a full-plastic needle tip stop structure. Background Art
[0002] In the prior art, the safety indwelling needle is composed of a hose assembly and a puncture assembly. Figure 1 As shown, when performing puncture with a safety indwelling needle, the needle seat (as an operating handle) needs to be pinched to perform the puncture operation. After the puncture is completed, the needle tube needs to be withdrawn, the puncture assembly and the hose assembly need to be separated, and the hose part needs to be left in the blood vessel, and the puncture assembly needs to be discarded. At this time, in order to prevent the needle tip of the needle tube in the puncture assembly from being exposed to the outside and causing harm to medical staff, a series of protective measures are required, such as the use of multi-layer telescopic protective covers, sliding rods, etc., which make the needle seat part of the puncture assembly longer and larger in appearance, and the needle tube is wrapped layer by layer, which makes it difficult to accurately and stably control the force and direction of the puncture when pinching the needle seat, and the operation is inconvenient. Summary of the invention
[0003] The utility model aims to provide an indwelling needle with a full-plastic needle tip stop structure which has small appearance size, short length and convenient operation according to the shortcomings of the prior art.
[0004] The purpose of the utility model is achieved through the following ways:
[0005] An indwelling needle with a full plastic needle tip stop structure includes a hose assembly and a puncture assembly. The hose assembly includes a hose and a hose fixing seat. The puncture assembly includes a needle tube, a connector, a stop eccentric block and a needle seat. One end of the needle tube is fixed to the needle seat. The needle tube body is sleeved in the hose. The needle tube tip passes through the puncture cone section at the front end of the hose and is exposed. The stop eccentric block has a needle hole A. The main structural features are:
[0006] The front end of the needle tube is provided with a micro-flange, the width of which is 2-6µm larger than the outer diameter of the needle tube, and the micro-flange is located in the inner cavity of the front end of the hose; the connector includes a conical boss at the front and a hollow cylindrical structure at the rear, the conical boss is inserted into the inner cavity of the rear part of the hose fixing seat and connected thereto, a needle hole B is provided at the axis of the conical boss, the inner cavity of the cylindrical structure can accommodate the eccentric stop block to flip therein, and at least two convex cards are provided along the inner side of the rear end of the cylindrical structure;
[0007] The needle seat is a stepped structure, the front part is a large diameter hollow section, which can accommodate the connector, and the connector can pass through the front opening of the large diameter hollow section, the rear part of the needle seat is a small diameter hollow section, and the connection between the large diameter hollow section and the small diameter hollow section is the fixed end surface of the needle tube; the outer peripheral surface of the large diameter hollow section is symmetrically provided with anti-slip gripping surfaces as an operating handle;
[0008] It also includes a stop-out locking block, which is installed in the inner cavity of the cylindrical structure. A stepped needle hole is arranged at the axis of the stop-out locking block, wherein the stepped large hole is at the front side, the diameter of the stepped small hole is larger than the needle tube diameter and smaller than the micro-flange width, and the rear end face of the stepped small hole is stopped in front of the convex clamp at the rear end of the cylindrical structure; the stop-out eccentric block is located in the inner cavity of the cylindrical structure in front of the front end of the stepped large hole; when the needle is withdrawn after puncture, the operating handle part on the outer peripheral surface of the large-diameter hollow section is pinched to pull the needle seat backward, at this time, the large-diameter hollow section outside the connector slides away from and moves away from the connector, and the needle tip part of the needle tube passes through the needle hole B of the conical boss and the needle hole A of the stop-out eccentric block in sequence until it is completely separated from the stop-out eccentric block, and the micro-flange of the needle tube is just stopped in front of the stepped small hole.
[0009] In this way, after the needle is removed, the connector is removed from the hose seat. At this time, the needle tip of the needle tube is completely located in the connector, with an eccentric stop block in front to prevent it from penetrating, and a stepped small hole of the locking block at the back to clamp the micro-flange of the needle tube to prevent it from slipping out. Therefore, the needle tip of the needle tube is completely covered and will not cause harm to medical staff. Therefore, the needle tip stop structure described in the utility model is only composed of the connector and the eccentric stop block and the locking block located in the inner cavity thereof. The needle seat directly wraps the connector, has a short length and a small appearance size, so it is easy to pinch and operate, and the accuracy and stability of the operation are improved.
[0010] The utility model can be further specified as follows:
[0011] Two symmetrical tangential side surfaces are arranged on the outer peripheral surface of the cylindrical structure of the connector, and the extending direction of the tangential side surfaces is the same as the axial direction of the cylindrical structure.
[0012] The chord-cut side surface can further reduce the wall thickness of part of the connector, while also increasing the elastic deformation range of the inner cavity of the cylindrical structure, thereby improving the tightness of the over-tight fit between the connector and the stop locking block. When the connector and the stop locking block are both made of hard plastic, the smaller wall thickness can also provide a more convenient installation operation.
[0013] The eccentric stop block is a conical body whose bottom surface is not perpendicular to the axis, and the pinhole A is arranged on the axis.
[0014] In this way, the center of gravity of the stop eccentric block is not on the axis. Therefore, when it freely falls and contacts the plane or the inner concave surface, the large surface always contacts other surfaces, so that the axis is always not parallel to the axis of the plane or the inner concave surface, and the needle hole A never overlaps with the needle hole B of the conical boss, avoiding the formation of a needle channel, ensuring that the needle tip can be blocked by the stop eccentric block and will not pass through the connector.
[0015] The length of the stepped large hole on the locking block is greater than the distance from the micro flange at the front end of the needle tube to the needle tip.
[0016] Like this, the leading end portion of needle tube is almost contained in the stepped macropore that stops going out the locking block, and is stuck in the stepped micropore by the micro-flange and is locked in the locking block that stops going out.
[0017] The micro flange on the needle tube is either a rotating body or a flat structure.
[0018] The body of revolution is cylindrical, that is, the same as the needle tube, but with a slightly larger outer diameter, and the flat structure can be regarded as micro-wing-shaped protrusions on both sides of the needle tube. Since the micro-flange is contained in the puncture cone section lumen at the front end of the hose, it will not affect the puncture operation.
[0019] The needle seat is made of transparent plastic, and an open groove is provided on one side of the large-diameter hollow section perpendicular to the protective gripping surface. The open groove extends along the axial direction to the fixed end face of the needle tube.
[0020] The provision of the open groove allows the operating handle to be elastically fitted to the outer peripheral surface of the connector when pinched during operation, further ensuring accurate and stable operation; on the other hand, it facilitates the insertion of the needle tube end and glue curing during production.
[0021] The small diameter hollow section of the needle seat is a blood return cavity, and the opening of the inner cavity is plugged with an exhaust tail plug.
[0022] The setting of the blood return chamber is to facilitate the observation of blood return during puncture.
[0023] A circular boss is arranged on the fixed end face of the needle tube in the needle seat, the outer diameter of which is smaller than the maximum spacing of the convex cards arranged on the inner side of the rear end of the connector, and a pin insertion hole and a pin insertion hole are arranged in the middle cavity of the boss, and the pin insertion hole is connected to the inner cavity of the small-diameter hollow section.
[0024] The annular boss can be inserted into the rear end of the connector so that the needle seat can be positioned relative to the connector.
[0025] In summary, the utility model provides an indwelling needle with a fully plastic needle tip stop structure, wherein the connector, stop eccentric block, stop locking block and needle seat are all made of hard plastic, which not only reduces weight but also facilitates plasticity and assembly. The needle tip stop structure is composed of only a connector and a stop eccentric block and a stop locking block located in its inner cavity, and the needle seat directly wraps the connector, has a short length and a small appearance, and is therefore easy to pinch and operate, thereby improving the accuracy and stability of the operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is a schematic structural diagram of a safety indwelling needle with a telescopic protective sleeve as described in the background technology of the utility model;
[0027] Figure 2 This is a schematic diagram of the appearance of the indwelling needle with a full plastic needle tip stop structure of the utility model; Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of;
[0028] Figure 4 It is a structural schematic diagram of the needle tube in the needle tip stop structure of the utility model;
[0029] Figure 5 This is a schematic diagram of the appearance structure of the connector in the needle tip stop structure of the utility model; Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure of;
[0030] Figure 7 This is a schematic diagram of the appearance structure of the eccentric block in the needle tip stopping structure of the utility model; Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure of;
[0031] Fig. 9 It is a structural schematic diagram of a locking block in the needle tip stopping structure of the utility model;
[0032] Fig.10 It is a structural schematic diagram of the needle seat in the needle tip stop structure of the utility model; Fig.11 It is a structural schematic diagram from the perspective of the needle seat opening slot direction; Fig.12 is a schematic diagram of the cross-sectional structure of the needle seat;
[0033] Fig.13 It is a schematic diagram of the separation structure of the indwelling needle with a full plastic needle tip stop structure after puncture is completed.
[0034] The utility model is further described below in conjunction with embodiments. DETAILED DESCRIPTION
[0035] Best Mode
[0036] See attached Figure 2-13 The indwelling needle with a full plastic needle tip stop structure includes a hose assembly and a puncture assembly. The hose assembly includes a hose 7 and a hose fixing seat 8. The puncture assembly includes a needle tube 1, a connector 2, a stop eccentric block 3, a stop locking block 4 and a needle seat 5.
[0037] See attached Figure 4 One end of the needle tube 1 is fixed to the needle seat 5, the needle tube 1 is inserted into the hose, the needle tip passes through the puncture cone section at the front end of the hose and is exposed, and a micro-flange 1.1 is provided at the front end of the needle tube 1, which can be a rotary shape or a flat shape (flat structure), and its width is 2~6µm larger than the outer diameter of the needle tube itself, and the micro-flange 1.1 is located in the inner cavity of the front end of the hose, specifically at the junction of the puncture cone section of the hose and the straight section of the hose and close to the straight section.
[0038] See attached Figure 5-6 The connector 2 is made of a plastic with a certain elasticity, and includes a conical boss 2.1 at the front and a hollow cylindrical structure 2.2 at the rear. The conical boss 2.1 has a certain length, and the outer circumference size is adapted to and transitionally matched with the inner cavity of the hose fixing seat, and is used to be inserted into the inner cavity of the rear part of the hose fixing seat and connected thereto. A pinhole B is provided at the axis of the conical boss 2.1; two symmetrical chord-cut side surfaces 2.3 are provided on the outer circumference of the cylindrical structure 2.2, and the extension direction of the chord-cut side surfaces 2.3 is the same as the axial direction of the cylindrical structure. The two chord side surfaces are used to reduce the wall thickness on both sides and increase the elastic deformation amplitude of the inner cavity of the cylindrical structure 2.2; the inner cavity of the cylindrical structure 2.2 can accommodate the stop eccentric block 4 to flip freely therein, and at least two convex cards 2.4 are provided along the inner side of the rear end of the cylindrical structure, and the present embodiment has two symmetrical convex cards.
[0039] See attached Figure 7-8 , there is a pinhole A on the stop eccentric block 3; the stop eccentric block 3 is made of hard plastic, is a cone whose conical bottom plane is not perpendicular to the axis, and constitutes an eccentric block whose center of gravity is not on the axis. The stop eccentric block 3 freely falls and contacts the plane or the inner concave surface, or shakes and contacts it, and the large surface always contacts other surfaces, so that the axis of the cone is always not parallel to the axis of the plane or the inner concave surface, and no matter what state the stop eccentric block is in, it can block the pinhole B of the conical boss 2.1.
[0040] See attached Fig. 9 The locking block 4 is made of hard plastic and is a cylindrical rotating body. It is installed in the inner cavity of the cylindrical structure. The outer circumference of the cylinder is slightly smaller than the inner cavity of the cylindrical structure 2.2 of the connector 2 and can slide in it. The axis of the locking block 4 is provided with a stepped needle hole, wherein the stepped large hole 4.2 is at the front side and its length is sufficient to cover the needle tip after the needle tube is locked. The diameter of the stepped small hole 4.1 is larger than the diameter of the needle tube and smaller than the width of the micro flange 1.1, so that the micro flange of the needle tube cannot pass through the stepped small hole 4.1. The rear end face of the stepped small hole 4.1 is stuck in front of the convex clamp 2.4 at the rear end of the cylindrical structure; the eccentric stop block 4 is located in the inner cavity of the cylindrical structure in front of the front end of the stepped large hole 4.2.
[0041] See attached Figure 10-12The needle seat 5 is made of transparent plastic and has a stepped structure. The front part is a large-diameter hollow section 5.1, which can accommodate the connector 2. The connector 2 can pass through the front opening of the large-diameter hollow section 5.1. The outer circumferential surface of the large-diameter hollow section 5.1 is symmetrically provided with anti-slip gripping surfaces as an operating handle portion 5.3. At the same time, the corresponding position of the inner cavity of the large-diameter hollow section is also an inner chord plane 5.4. When the connector is inserted into it, its chord-cut side surface 2.3 corresponds to the position of the operating handle portion 5.3 and the inner chord plane 5.4; an open groove 5.8 is opened on one side of the large-diameter hollow section 5.1 perpendicular to the protective gripping surface, and the open groove 5.8 extends along the axial direction to the fixed end face of the needle tube.
[0042] The rear part of the needle seat 5 is a small diameter hollow section 5.2, the inner cavity of the small diameter hollow section 5.2 is a blood return cavity 5.6, and the opening of the inner cavity is plugged with an exhaust tail plug 6. The connection between the large diameter hollow section 5.1 and the small diameter hollow section 5.2 is the needle tube fixed end face; the needle tube fixed end face is provided with a circular boss, the outer diameter of the circular boss is smaller than the distance between the two convex cards provided on the inner side of the rear end of the connector, and the middle cavity of the boss is provided with a needle insertion glue hole 5.7 and a needle insertion hole 5.5, and the needle insertion hole 5.5 is connected with the inner cavity of the small diameter hollow section 5.2.
[0043] See attached Fig.13 After the indwelling needle punctures the blood vessel successfully, blood flows into the blood return cavity through the inner cavity channel of the needle tube, and blood return is seen. Then the hose is pushed into the blood vessel. After the catheter is successfully placed, the operating handle is pinched and the punctured needle tube is slowly withdrawn in the direction away from the hose fixing seat. At this time, the large-diameter hollow section on the outer periphery of the connector slides away from and away from the connector, and the needle tip of the needle tube passes through the needle hole B of the conical boss and the needle hole A of the stop eccentric block in sequence, until the needle tip of the needle tube is retracted into the connector, and the micro-flange on the needle tube is locked with the stepped small hole on the stop locking block. At this time, the stop eccentric block is separated from the needle tube and falls into the connector cavity at the front end of the stop locking block. Continue to pull the needle tube, and the needle tube drives the stop locking block to slide in the inner cavity of the connector until the stop locking block touches the convex card of the inner cavity at the rear of the connector and stops. Then pull the needle tube, and the stop locking block drives the connector to separate from the indwelling catheter assembly, and the indwelling needle operation is completed.
[0044] The parts not described in the present invention are the same as those in the prior art.
Claims
1. An indwelling needle with a full plastic needle tip stop structure, comprising a hose assembly and a puncture assembly, the hose assembly comprising a hose and a hose fixing seat, the puncture assembly comprising a needle tube, a connector, a stop eccentric block and a needle seat, one end of the needle tube is fixed to the needle seat, the needle tube body is sleeved in the hose, the needle tube tip passes through the puncture cone section at the front end of the hose and is exposed, and the stop eccentric block has a needle hole A; characterized in that: The front end of the needle tube is provided with a micro-flange, the width of which is 2-6µm larger than the outer diameter of the needle tube, and the micro-flange is located in the inner cavity of the front end of the hose; the connector includes a conical boss at the front and a hollow cylindrical structure at the rear, the conical boss is inserted into the inner cavity of the rear part of the hose fixing seat and connected thereto, a needle hole B is provided at the axis of the conical boss, the inner cavity of the cylindrical structure can accommodate the eccentric stop block to flip therein, and at least two convex cards are provided along the inner side of the rear end of the cylindrical structure; The needle seat is a stepped structure, the front part is a large diameter hollow section, which can accommodate the connector, and the connector can pass through the front opening of the large diameter hollow section, the rear part of the needle seat is a small diameter hollow section, and the connection between the large diameter hollow section and the small diameter hollow section is the fixed end surface of the needle tube; the outer peripheral surface of the large diameter hollow section is symmetrically provided with anti-slip gripping surfaces as an operating handle; It also includes a stop-out locking block, which is installed in the inner cavity of the cylindrical structure. A stepped needle hole is arranged at the axis of the stop-out locking block, wherein the stepped large hole is at the front side, the diameter of the stepped small hole is larger than the needle tube diameter and smaller than the micro-flange width, and the rear end face of the stepped small hole is stopped in front of the convex clamp at the rear end of the cylindrical structure; the stop-out eccentric block is located in the inner cavity of the cylindrical structure in front of the front end of the stepped large hole; when the needle is withdrawn after puncture, the operating handle part on the outer peripheral surface of the large-diameter hollow section is pinched to pull the needle seat backward, at this time, the large-diameter hollow section outside the connector slides away from and moves away from the connector, and the needle tip part of the needle tube passes through the needle hole B of the conical boss and the needle hole A of the stop-out eccentric block in sequence until it is completely separated from the stop-out eccentric block, and the micro-flange of the needle tube is just stopped in front of the stepped small hole.
2. The indwelling needle with a fully plastic needle tip stop structure according to claim 1, characterized in that: Two symmetrical tangential side surfaces are arranged on the outer peripheral surface of the cylindrical structure of the connector, and the extending direction of the tangential side surfaces is the same as the axial direction of the cylindrical structure.
3. The indwelling needle with a fully plastic needle tip stop structure according to claim 1, characterized in that: The eccentric stop block is a conical body whose bottom surface is not perpendicular to the axis, and the pinhole A is arranged on the axis.
4. The indwelling needle with a fully plastic needle tip stop structure according to claim 1, characterized in that: The length of the stepped large hole on the locking block is greater than the distance from the micro flange at the front end of the needle tube to the needle tip.
5. The indwelling needle with a fully plastic needle tip stop structure according to claim 1, characterized in that: The micro flange on the needle tube is either a rotating body or a flat structure.
6. The indwelling needle with a fully plastic needle tip stop structure according to claim 1, characterized in that: The needle seat is made of transparent plastic, and an open groove is provided on one side of the large-diameter hollow section perpendicular to the protective gripping surface. The open groove extends along the axial direction to the fixed end face of the needle tube.
7. The indwelling needle with a fully plastic needle tip stop structure according to claim 1, characterized in that: The small diameter hollow section of the needle seat is a blood return cavity, and the opening of the inner cavity is plugged with an exhaust tail plug.
8. The indwelling needle with a fully plastic needle tip stop structure according to claim 1, characterized in that: A circular boss is arranged on the fixed end face of the needle tube in the needle seat, the outer diameter of which is smaller than the maximum spacing of the convex cards arranged on the inner side of the rear end of the connector, and a pin insertion hole and a pin insertion hole are arranged in the middle cavity of the boss, and the pin insertion hole is connected to the inner cavity of the small-diameter hollow section.