Spring-type vein puncture needle

Abstract

A spring-type vein puncture needle capable of retracting a needle head (1) after use to avoid exposure of the needle head (1), comprising a needle component and a needle housing. The needle component comprises a needle head (1) and a needle holder (2) fixedly connected, and the needle holder (2) is provided with a first elastic cantilever (21) and a second elastic cantilever (22). The needle component is axially and movably disposed inside the needle housing, the needle housing is provided with a first step (82) and a second step (71), and a button (6) and a button cover (9) are connected to the needle housing. A spring (5) is provided between the needle component and the needle housing. When in use, the first elastic cantilever (21) is restricted by the first step (82), so that the needle component is fastened onto one end of the needle housing and the needle head (1) is exposed out of the needle housing. After use, the button (6) is triggered so as to release the restriction of the first step (82) to the first elastic cantilever (21), so that the needle component is pushed by the spring (5) to move to the other end of the needle housing to drive the needle head (1) to retract back into the needle housing, and the second elastic cantilever (22) is restricted by the second step (71) so as to prevent the needle component from moving reversely. According to the spring-type vein puncture needle, the retraction of the needle head (1) can be stably and reliably implemented, so as to prevent the needle head (1) from moving back and out of the needle housing after retracting.

Description

A spring-loaded venipuncture needle Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a spring-loaded venous puncture needle whose needle can be retracted after use to prevent it from being exposed. Background Art

[0002] Venipuncture needles are disposable items widely used in medical practice, often used for injections and blood collection. After use, the needle tip is exposed and may accidentally puncture or scratch the human skin, posing a risk of infection and causing great inconvenience in recycling and disposal. Technical issues

[0003] The patent with publication number CN106540353A discloses a butterfly needle assembly with a safety mechanism that can retract the needle. The butterfly needle assembly includes a needle seat provided with a needle, a hose connected to the needle seat and connected to the needle through the needle seat, a protective member provided outside the needle seat for axial sliding of the needle seat, a butterfly wing fixed to the protective member, and an actuator for engaging with a corresponding engagement structure on the needle seat or the protective member. When in use, one hand presses the butterfly wing, and the fingers of the other hand press the actuator to deform it, so that the actuator is out of contact with the engagement structure on the needle seat or the protective member, and at the same time, the other finger is used to pull the hose, so that the needle seat in an axially active state drives the needle to move to the inside of the protective member to prevent the needle from being exposed. When using this type of structure, one hand needs to press the actuator and pull the hose at the same time, which is relatively complicated to operate.

[0004] Patent publication number CN115299942A discloses a safe, spring-retractable butterfly needle with simpler operation, which includes butterfly wings, a compression spring, a needle seat, a needle housing, a needle head, and a locking ring. The needle housing is axially through-set, the tail end of the needle head is connected to the needle seat, the needle seat is slidably accommodated in the needle housing, the needle head extends from the front end of the needle housing, the spring is accommodated in the needle housing, and is axially compressed between the needle housing and the needle seat. The needle seat is suspended with an elastic arm extending in the opposite direction of the needle seat sliding direction, one end of the elastic arm is provided with an elastic locking head, the rear edge of the needle housing opening is provided with an activation limit step, and the elastic locking head is hooked on the lower edge of the activation limit step. The butterfly wings extend to suspend an elastic activation button, which abuts against the activation limit step. A locking ring is floatingly arranged in an annular groove at the rear end of the needle housing cavity. When in use, first push the elastic excitation button above the elastic locking head forward to make it slide off the edge of the needle shell opening of the needle shell, and then press it down to touch the elastic locking head on the needle seat to make it disengage from the excitation limit step. The needle seat will drive the needle to retract into the needle shell under the action of the compression spring. During the retraction process of the needle seat, the tail of the needle seat is stuck in the floating locking ring, and the locking ring falls to the bottom of the annular groove of the needle shell, so that the needle can no longer move back and be exposed outside the needle shell.

[0005] With such a structure, the needle can be retracted by simply pressing the elastic excitation button, which is easy to operate. However, since the internal volume of the butterfly needle shell will limit the size of the elastic locking buckle head extending outward from the end of the elastic arm, the contact area between the elastic arm and the excitation limit step hook is limited, and the elastic arm extends from the position connected to the needle seat toward the direction where the needle is located. When the needle is squeezed by external force without the action of the button and tends to retract into the needle shell, the elastic arm will be stretched and tend to shrink inward, which can easily cause the elastic locking buckle head with an insufficient hook contact surface to detach from the excitation limit step, causing the needle to retract by mistake. In addition, using a floating lock ring to clamp the tail of the needle seat requires a large spring thrust and a high concentricity requirement between the needle seat and the needle shell. There is a risk that the lock ring cannot lock the tail of the needle seat, causing the needle to slip back and expose itself outside the needle shell again, which is not reliable enough. Technical Solutions

[0006] The technical problem to be solved by the present application is to provide a spring-loaded intravenous puncture needle to solve the problem that the existing butterfly needle with retractable needle head is prone to accidental retraction of the needle head and the needle head is prone to back-moving after retraction.

[0007] In order to solve the above technical problems, the technical solutions provided by this application are as follows:

[0008] A spring-loaded venipuncture needle comprising at least:

[0009] A needle housing is provided with an axially extending inner cavity, and a button mounting hole is provided near the distal end of the needle housing and radially extends through the inner cavity;

[0010] a button, the button being installed in the button installation hole;

[0011] Butterfly wings, the butterfly wings are fixedly mounted on the needle housing;

[0012] A needle assembly, the needle assembly comprising a needle seat axially movably connected to the inner cavity and a needle head, the needle head being fixedly connected to the distal end of the needle seat;

[0013] a compression spring disposed between the needle seat and the distal end of the inner cavity;

[0014] The needle seat is provided with a first elastic cantilever and at least one second elastic cantilever, the first elastic cantilever extends obliquely from the position connected to the needle seat to the proximal end, and the second elastic cantilever extends obliquely from the position connected to the needle seat to the distal end; a first step and a second step are provided in the inner cavity, and the first step is located on the proximal side of the button mounting hole; the spring-loaded venous puncture needle includes at least a use state and a non-return state, in which the needle assembly is located at the distal end of the inner cavity, the free end of the first elastic cantilever abuts against the first step, and the free end of the first elastic cantilever is located below the button, and in the non-return state, the needle assembly is located at the proximal end of the inner cavity, and the free end of the second elastic cantilever abuts against the second step.

[0015] In a preferred embodiment, the first elastic cantilever and the second elastic cantilever are staggered in the circumferential direction of the needle seat.

[0016] In a preferred embodiment, the needle housing includes a first needle housing and a second needle housing that are fixedly connected, the second step is provided at the proximal end of the first needle housing, and the button mounting hole is provided at the distal side of the second needle housing.

[0017] In a preferred embodiment, a button cover is fixedly connected to the button mounting hole of the second needle housing, and the button is axially movably connected in the button cover.

[0018] In a preferred embodiment, the first needle housing is provided with a needle housing opening. In the use state, the free end of the second elastic cantilever is located at the needle housing opening, and the second elastic cantilever is in a free state.

[0019] In a preferred embodiment, a catheter communicating with the needle head is connected to the proximal end of the needle seat, and the catheter extends through the inner cavity to the outside of the needle housing.

[0020] In a preferred embodiment, the needle is covered with a needle shield.

[0021] In a preferred embodiment, the butterfly wing is a single butterfly wing or a double butterfly wing.

[0022] After adopting such a structure, the free end of the first elastic cantilever directly abuts against the first step, and there is no need to set up an additional elastic locking head, which increases the contact area between the first elastic cantilever and the first step, and the limiting is more reliable. In addition, the first elastic cantilever extends obliquely from the position connected to the needle seat to the proximal end. When the needle is squeezed by external force without the action of the button and tends to retract into the needle shell, the first elastic cantilever will be squeezed inward by the needle head and the first step, thereby tending to expand outward, making it less likely to lose contact with the first step and cause the needle to retract accidentally. After the needle retracts, the spring only needs to push the needle seat to the specified position, and the second elastic cantilever on the needle seat will spontaneously expand and abut against the second step of the needle shell, preventing the needle from returning to the use state, and the structure is more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic diagram of the three-dimensional structure of the spring-loaded venipuncture needle of this embodiment;

[0024] FIG2 is a schematic cross-sectional view of the spring-loaded venipuncture needle according to the embodiment of the present invention when in use, from the perspective of the first elastic cantilever;

[0025] FIG3 is a partial enlarged schematic diagram of portion A shown in FIG2 ;

[0026] FIG4 is a schematic cross-sectional view of the spring-loaded venipuncture needle according to the embodiment of the present invention when in use, from the perspective of the second elastic cantilever;

[0027] FIG5 is a schematic cross-sectional view of the spring-loaded venipuncture needle in the non-return state from the perspective of the second elastic cantilever of this embodiment;

[0028] FIG6 is a schematic diagram of the three-dimensional structure of the needle seat in the spring-loaded venipuncture needle of this embodiment;

[0029] FIG7 is a schematic diagram of the three-dimensional structure of the button in the spring-loaded venipuncture needle of this embodiment;

[0030] FIG8 is a schematic diagram of the three-dimensional structure of the first needle housing in the spring-loaded venipuncture needle of this embodiment;

[0031] FIG9 is a schematic diagram of the three-dimensional structure of the second needle housing in the spring-loaded venipuncture needle of this embodiment;

[0032] FIG10 is a schematic perspective cross-sectional view of the second needle housing of the spring-loaded venipuncture needle of this embodiment;

[0033] FIG11 is a schematic diagram of the three-dimensional structure of the button cover in the spring-loaded venipuncture needle of this embodiment.

[0034] Explanation of the accompanying drawings: 1-needle, 2-needle seat, 3-catheter, 4-butterfly wing, 5-compression spring, 6-button, 7-first needle shell, 8-second needle shell, 9-button cover, 10-needle sheath, 21-first elastic cantilever, 22-second elastic cantilever, 23-main body, 61-button end, 62-button flange, 63-contact surface, 71-second step, 72-needle shell opening, 73-positioning hole, 74-groove, 81-button mounting hole, 82-first step, 83-positioning pin, 84-second needle shell flange, 85-slot, 86-button cover mounting seat, 91-button cover step, 92-card column, 93-button cover flange, 94-button cover opening, 100-inner cavity. Best Mode for Carrying Out the Invention

[0035] Type here the best mode description paragraph of the invention. Modes for Carrying Out the Invention

[0036] The following further describes the specific embodiments of the present application in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0037] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0038] In this embodiment, the end of the butterfly needle facing the patient is defined as the distal end, and the end facing the user is defined as the proximal end.

[0039] As shown in Figures 1 and 2, the spring-loaded venous puncture needle of this embodiment includes a first needle housing 7 and a second needle housing 8, each of which is fixedly connected together. The first and second needle housings 7 and 8 are provided with an axially extending inner cavity 100, within which a needle hub 2 is disposed. The needle hub 2 is axially slidable along the inner cavity 100. The interior of the needle hub 2 is continuous, with the distal end of the needle hub 2 connected to the needle 1 and the proximal end connected to the catheter 3. The needle 1 is covered with a needle sheath 10, which is connected to the needle 1 through the needle hub 2 and extends through the inner cavity 100 to the exterior of the second needle housing 8. The distal end of the first needle housing 7 is fixedly connected to a butterfly wing 4. In this embodiment, the butterfly wing 4 is a pair of butterfly wings, but a single butterfly wing can also be used depending on the actual situation. A button 6 and a button cover 9 are mounted above the distal end of the second needle housing 8. A compression spring 5 is disposed at the distal end of the inner cavity 100, which is mounted on the needle hub 2.

[0040] As shown in Figure 6, the needle seat 2 is provided with a main body 23, and a first elastic cantilever 21 is provided above the needle seat 2 and extends obliquely toward the proximal end of the needle seat 2. Second elastic cantilevers 22 are symmetrically provided on the front and rear sides of the needle seat 2 and extend toward the distal end of the needle seat 2. The compression spring 5 is mounted on the main body 23 of the needle seat 2.

[0041] As shown in FIG. 7 , the button 6 is provided with a cylindrical button end 61 , an annular button flange 62 and a contact surface 63 for pressing in sequence from bottom to top.

[0042] As shown in Figure 8, the distal end of the first needle housing 7 is provided with a front-to-back symmetrical needle housing opening 72, the proximal end is provided with a second step 71 along the circumferential direction, the root of the second step 71 is provided with an annular groove 74, and the bottom surface of the second step 71 is provided with a positioning hole 73.

[0043] As shown in Figures 9 and 10, a positioning pin 83 and a second needle housing flange 84 extending inwardly along the circumferential direction are provided on the distal end surface of the second needle housing 8. A button cover mounting seat 86 is provided above the distal end of the second needle housing 8. A button mounting hole 81 extending through the inner cavity 100 is provided inside the button cover mounting seat 86. Slots 85 are symmetrically provided on the front and rear sides of the button cover mounting seat 86. A first step 82 is provided inwardly extending from the proximal side edge of the button mounting hole 81.

[0044] As shown in Figure 11, the button cover 9 is provided with a button cover opening 9, and a button cover step 91 is provided at the button cover opening 9. A clamping column 92 is symmetrically extended from the edge of the button cover 9, and a button cover flange 93 extends inward from the free end of the clamping column 92.

[0045] The first needle shell 7 and the second needle shell 8 are clamped with the second needle shell flange 84 through the groove 74 to limit the axial displacement of the two, and are clamped with the positioning hole 73 through the positioning pin 83 to limit the radial displacement of the two, thereby achieving complete fixation. The button cover 9 is installed on the button cover mounting seat 86 of the second needle shell 8, and is clamped and fixed with the button cover flange 93 through the clamping groove 85. The button end 61 of the button 6 extends to the inner cavity 100 through the button mounting hole 81, and the contact surface 63 is exposed through the button cover opening 94 of the button cover 9. The button 6 can move axially in the button cover 9, and the button cover flange 93 restricts the button flange 62 to prevent the button 6 from detaching from the button mounting hole 81.

[0046] When the spring-loaded venous puncture needle of this embodiment is in use, as shown in Figures 2 and 3, the needle seat 2 is located at the distal end of the butterfly needle, the button end 61 of the button 6 abuts against the upper side of the free end of the first elastic cantilever 21 of the needle seat 2, and the right side of the free end of the first elastic cantilever 21 of the needle seat 2 abuts against the first step 82 of the second needle housing 8. The spring 5 is in a compressed state, and the first step 82 limits the axial displacement of the needle seat 2. At this time, as shown in Figure 4, the free end of the second elastic cantilever 22 of the needle seat 2 is located within the needle housing opening 72 of the first needle housing 7, and the second elastic cantilever 22 is in a free state. The advantage of this arrangement is to prevent the second elastic cantilever 22 from being weakened or even losing its elasticity due to being compressed inside the inner cavity 100 for a long time.

[0047] When using the spring-loaded venous puncture needle of this embodiment, first remove the needle sheath 10, insert the needle 1 into the patient's skin, and secure the butterfly wings 4 with tape. After use, press the button 6 through the contact surface 63, and the button end 61 drives the free end of the first elastic cantilever 21 to move downward. The first elastic cantilever 21 disengages from the first step 82, and the needle seat 2 drives the needle 1 proximally under the thrust of the compression spring 5 until the needle 1 is completely retracted into the inner cavity 100. During the proximal movement of the needle seat 2, the second elastic cantilever 22 will shrink and deform inward under the pressure of the inner wall of the first needle housing 7 until the second elastic cantilever 22 completely passes through the second step 71 and enters the interior of the second needle housing 8. At this point, the second elastic cantilever 22, no longer pressed by the inner wall of the first needle housing 7, will expand outward, and the needle 1 will be completely retracted into the inner cavity 100. The spring-loaded venous puncture needle enters a non-return state, as shown in Figure 5. In the non-return state, even if the needle seat 2 tends to move distally, the free end of the second elastic cantilever 22 will abut against the end of the second step 71 to limit the axial movement of the needle seat 2 and prevent the needle seat 2 from moving back, thereby stably achieving the retraction of the needle 1 and preventing the needle 1 from being exposed.

[0048] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the scope of protection of the present application. Industrial Applicability

[0049] Type your industrial applicability description paragraph here. Sequence Listing Free Content

[0050] Type your sequence listing free description paragraph here.

Claims

1. A spring-loaded venous puncture needle, comprising at least: A needle housing, wherein an axially penetrating inner cavity (100) is provided in the needle housing, and a button mounting hole (81) is provided near the distal end of the needle housing and radially penetrates the inner cavity (100); A button (6), the button (6) being mounted in the button mounting hole (81); A butterfly wing (4), wherein the butterfly wing (4) is fixedly mounted on the needle housing; A needle assembly, the needle assembly comprising a needle seat (2) and a needle head (1) axially movably connected in the inner cavity (100), the needle head (1) being fixedly connected to the distal end of the needle seat (2); A compression spring (5), the compression spring (5) being arranged between the needle seat (2) and the distal end of the inner cavity (100); Features: The needle seat (2) is provided with a first elastic cantilever (21) and at least one second elastic cantilever (22), the first elastic cantilever (21) extending obliquely from a position connected to the needle seat (2) toward the proximal end, and the second elastic cantilever (22) extending obliquely from a position connected to the needle seat (2) toward the distal end; a first step (82) and a second step (71) are provided in the inner cavity (100), the first step (82) being located at the proximal side of the button mounting hole (81); the spring-loaded venous puncture needle comprises at least a use state and a non-return state, in which the needle assembly is located at the distal end of the inner cavity (100), the free end of the first elastic cantilever (21) abuts against the first step (82), and the free end of the first elastic cantilever (21) is located below the button (6); in the non-return state, the needle assembly is located at the proximal end of the inner cavity (100), and the free end of the second elastic cantilever (22) abuts against the second step (71).

2. The spring-loaded venous puncture needle according to claim 1, characterized in that: The first elastic cantilever (21) and the second elastic cantilever (22) are arranged in a staggered manner in the circumferential direction of the needle seat (2).

3. The spring-loaded venous puncture needle according to claim 1 or 2, characterized in that: The needle housing comprises a first needle housing (7) and a second needle housing (8) which are fixedly connected, the second step (71) is arranged at the proximal end of the first needle housing (7), and the button mounting hole (81) is arranged at the distal side of the second needle housing (8).

4. The spring-loaded venous puncture needle according to claim 3, characterized in that: A button cover (9) is fixedly connected to the button mounting hole (81) of the second needle housing (8), and the button (6) is axially movably connected inside the button cover (9).

5. The spring-loaded venous puncture needle according to claim 4, characterized in that: The first needle housing (7) is provided with a needle housing opening (72), and in the use state, the free end of the second elastic cantilever (22) is located at the needle housing opening (72), and the second elastic cantilever (22) is in a free state.

6. The spring-loaded venous puncture needle according to claim 1, characterized in that: The proximal end side of the needle seat (2) is connected to a catheter (3) that is in communication with the needle head (1), and the catheter (3) passes through the inner cavity (100) and extends to the outside of the needle housing.

7. The spring-loaded venous puncture needle according to claim 1, characterized in that: The needle (1) is provided with a needle sheath (10).

8. The spring-loaded venous puncture needle according to claim 1, characterized in that: The butterfly wing (4) is a single butterfly wing or a double butterfly wing.

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