A needle-puncture prevention device with a limited spring piece and a stopper

Abstract

A needle puncture prevention device with a limiting spring and a stopper comprises: a catheter seat assembly, the rear end of which is provided with an anti-slip structure; a needle shield, which is provided with a needle through hole, a slide groove, a first positioning groove, and a slot; a stopper, which is slidably installed in the slide groove, one side of which cooperates with the needle tube, and the other side cooperates with the anti-slip structure and the limiting spring; the limiting spring is installed in the first positioning groove and the slot, and a stop hole is provided on it; a needle seat, which covers the rear part of the needle shield; the needle tube passes through the catheter seat assembly, the needle shield, and the limiting spring, and provides support for the stopper, and the rear end of the needle seat is fixed in the needle seat, and a protruding buckle is provided near the front end. Pull the needle seat backward to make the needle seat drive the needle tube to retreat, and when the needle tube retreats to the point where the protruding buckle is blocked by the stop hole of the limiting spring, the front end of the needle tube retreats away from the stopper, and the stopper slides into the slide groove of the needle shield under the action of the limiting spring, thereby blocking the front end of the needle tube, and the needle tip is shielded in the needle shield, thereby improving the safety of the product.

Description

Technical Field

[0001] The invention relates to the technical field of needle protection, and in particular to a needle puncture prevention device which cooperates with a limiting spring piece and a stopper. Background Art

[0002] After the existing products with needle tubes are pulled out after use, the needle tip of the needle tube is often exposed to the outside, which can easily cause punctures to people. This is especially true for medical needle products, where the safety hazard is more serious. Once a used medical needle product causes a puncture to a person, there is a possibility of cross infection. Summary of the invention

[0003] In view of the above problems, the present invention provides a needle-puncture prevention device which comprises a limiting spring piece and a stopper.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A needle-puncture prevention device with a limiting spring piece and a stopper, comprising:

[0006] The catheter seat assembly has an anti-drop structure at its rear end;

[0007] A needle protection sleeve, wherein a needle through hole is provided therein and passes through along the axis, wherein the front portion of the needle protection sleeve is inserted from the rear end of the catheter seat assembly, wherein a slide groove is provided at the front end of the outer wall, wherein the slide groove separates the front end of the needle through hole into two sections, wherein a first positioning groove parallel to the axis is provided between the front end and the rear end of the outer wall, wherein a slot is provided at the rear end of the outer wall, wherein the slot separates the rear end of the needle through hole into two sections;

[0008] The stopper is slidably mounted in the slide groove of the needle shield, and the side facing the inside of the slide groove of the needle shield cooperates with the needle tube, and the other side facing the outside of the slide groove of the needle shield cooperates with the anti-drop structure and the limiting spring sheet of the catheter seat assembly;

[0009] The limiting spring piece is installed in the first positioning groove and the slot of the needle protective sleeve, and its front end cooperates with the anti-drop structure of the catheter seat assembly and contacts with the other side of the stopper. The front end of the spring piece contacts with the other side of the stopper to produce elastic deformation, thereby providing the stopper with a force to slide into the slide groove of the needle protective sleeve, and its rear end is provided with a stop hole corresponding to the needle through hole of the needle protective sleeve;

[0010] A needle seat, covering the rear portion of the needle guard;

[0011] The needle tube passes through the catheter seat assembly, the needle through hole of the needle protective sleeve, and the stop hole of the limit spring piece, and provides support for the stopper. Its rear end is fixed in the needle seat, and its outer wall near the front end is provided with a protruding buckle whose size is larger than the stop hole of the limit spring piece;

[0012] The needle seat is pulled backward, driving the needle tube to retreat axially together. When the needle tube retreats to the point where the raised buckle is blocked by the stop hole of the limiting spring sheet, the front end of the needle tube retreats and leaves the block, and the block loses the support of the needle tube. Under the elastic restoring force of the limiting spring sheet, the block is separated from the anti-detachment structure of the catheter seat assembly and slides into the inside of the slide groove of the needle guard sleeve, so that the block blocks the front end of the needle through hole of the needle guard sleeve to prevent the front end of the needle tube from extending forward. The needle guard sleeve, the block and the limiting spring sheet shield the front end of the needle tube, and the needle seat continues to be pulled backward, driving the limiting spring sheet through the raised buckle of the needle tube, and then driving the needle guard sleeve and the block thereon to move backward together. When the front end of the limiting spring sheet is separated from the anti-detachment structure of the catheter seat assembly and the needle guard sleeve is pulled out from the rear end of the catheter seat assembly, it is separated from the catheter seat assembly.

[0013] To further refine the above technical solution, the anti-drop structure of the catheter seat assembly can be a slot penetrating the side wall of the catheter seat, and the rear side of the other side of the stopper is provided with a stop protrusion that matches the slot of the catheter seat.

[0014] The limiting spring piece includes an elastic arm and a limiting piece. The elastic arm is installed in the first positioning groove of the needle shield. The front end of the elastic arm cooperates with the anti-drop structure of the catheter seat assembly and contacts the other side of the stopper. The elastic arm is elastically deformed by the front end contacting the other side of the stopper, providing the stopper with a force to slide into the slide groove of the needle shield. The limiting piece is installed in the slot of the needle shield and is provided with a stop hole. A second positioning groove for the front end of the elastic arm of the limiting spring piece to be inserted can be provided on the other side of the stopper. The edge of the stop hole of the limiting spring piece can be provided with a flange.

[0015] The front side, the rear side and both sides of the stopper may be provided with positioning surfaces matching with the slide groove of the needle protection sleeve. Both sides of the stopper may also be provided with positioning convex ribs matching with the slide groove of the needle protection sleeve.

[0016] The slide groove and the slot of the needle protection sleeve may both be arranged along the radial surface.

[0017] A groove connected to the inner hole is provided at the front end of the needle tube, and the side of the block that cooperates with the needle tube can adopt an arc transition with the front side surface. When the needle tube retreats and passes through the block, one side of the block is tightly attached to the outer wall of the needle tube under the elastic restoring force of the limiting spring sheet and is located outside the groove of the needle tube, so that the needle tube retreats smoothly.

[0018] Compared with the prior art, the present invention has the following beneficial effects: the overall structure is compact and the operation is simple. The needle seat is pulled backward to drive the needle tube to retreat axially. When the needle tube retreats to the point where the protruding buckle is blocked by the stop hole of the limiting spring sheet, the front end of the needle tube retreats and leaves the block. The block loses the support of the needle tube and slides into the slide groove of the needle shield under the elastic restoring force of the limiting spring sheet, thereby blocking the front end of the needle through hole of the needle shield and preventing the front end of the needle tube from extending forward, thereby shielding the front end needle tip of the needle tube within the needle shield, thereby improving the safety of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the decomposed structure of an embodiment of the present invention.

[0020] Figure 2 It is a full cross-sectional view of an embodiment of the present invention.

[0021] Figure 3 FIG. 4 is a schematic structural diagram of a catheter seat assembly in one embodiment of the present invention.

[0022] Figure 4 The figure is a schematic diagram of the assembly of the needle protection sleeve, the stopper, the limiting spring piece and the needle tube in one embodiment of the present invention.

[0023] Figure 5 Schematic diagram of the structure of a needle protection sleeve in one embodiment of the present invention.

[0024] Figure 6 Schematic diagram of the structure of a stopper in one embodiment of the present invention.

[0025] Figure 7 FIG. 1 is a schematic structural diagram of a position-limiting spring in an embodiment of the present invention.

[0026] Figure 8 FIG. 4 is another schematic diagram of the structure of a limiting spring piece in an embodiment of the present invention.

[0027] Fig. 9 It is a partial cross-sectional view of an embodiment of the present invention.

[0028] Fig.10 Schematic diagram of the structure of the needle seat and the needle tube in one embodiment of the present invention.

[0029] Fig.11 It is a partial cross-sectional view of an embodiment of the present invention entering a self-destruct state.

[0030] Fig.12 It is a schematic diagram of the structure of an embodiment of the present invention being separated from the catheter seat assembly after entering the self-destruct state.

[0031] Fig.13 Schematic diagram of the process of the groove of the needle tube passing through the stopper in one embodiment of the present invention.

[0032] The parts in the figure are numbered as follows:

[0033] 1 catheter seat assembly, 101 catheter seat, 1011 slot, 102 metal wedge, 103 catheter, 104 isolation plug;

[0034] 2 needle protection sleeve, 201 needle through hole, 202 slide groove, 203 first positioning groove, 204 slot;

[0035] 3 stopper, 301 second positioning groove, 302 stop protrusion, 303 positioning surface, 304 positioning convex rib, 305 arc;

[0036] 4 limiting spring pieces, 401 elastic arm portion, 402 limiting piece portion, 4021 stop hole, 4022 flange;

[0037] 5 needle seat, 501 seat body, 502 handle;

[0038] 6 needle tube, 601 raised buckle, 602 slot. DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that those skilled in the art can more clearly understand how to practice the present invention. Although the present invention is described in conjunction with its preferred specific embodiments, these embodiments are only illustrative, rather than limiting the scope of the present invention.

[0040] See also Figure 1 and Figure 2 A needle-stick prevention device with a limiting spring piece and a stopper comprises a catheter seat assembly 1, a needle protection sleeve 2, a stopper 3, a limiting spring piece 4, a needle seat 5, and a needle tube 6.

[0041] See also Figure 2 and Figure 3 The catheter seat assembly 1 includes a catheter seat 101, a metal wedge 102, a catheter 103, and an isolation plug 104. The metal wedge 102 and the isolation plug 104 are installed in the catheter seat 101 in a front-to-back arrangement. The catheter 103 extends from the front end of the catheter seat 101, and its rear end is fixed to the metal wedge 102. An anti-slip structure is provided at the rear end of the inner wall of the catheter seat 101, which is used to cooperate with the stop protrusion 302302 of the stopper 3 and the front end of the elastic arm 401 of the limiting spring sheet 4 to ensure that the needle shield 2 is connected to the catheter seat 101, see Figure 3 The anti-drop structure is a slot 1011 that penetrates the side wall of the catheter seat 101 .

[0042] See also Figure 2 The front portion of the needle shield 2 is inserted into the catheter adapter 101 from the rear end of the catheter adapter 101. Figure 4 and Figure 5The needle protection sleeve 2 is cylindrical, and a needle through hole 201 penetrating along the axis is provided in the needle protection sleeve 2; a slide groove 202 arranged along the radial surface is provided at the front end of the outer wall of the needle protection sleeve 2, and the slide groove 202 divides the front end of the needle through hole 201 into two sections, and the slide groove 202 is used to install the stopper 3; a first positioning groove 203 parallel to the axis is provided between the front and rear ends of the outer wall of the needle protection sleeve 2, and the first positioning groove 203 is used to install the elastic arm portion 401 of the limiting spring piece 4; a slot 204 arranged along the radial surface is provided at the rear end of the outer wall of the needle protection sleeve 2, and the slot 204 divides the rear end of the needle through hole 201 into two sections, and the slot 204 is used to install the limiting piece portion 402 of the limiting spring piece 4.

[0043] See also Figure 4 , Figure 6 and Fig. 9 The stopper 3 can be slidably installed in the slide groove 202 of the needle protection sleeve 2, and the side of the stopper 3 facing the slide groove 202 cooperates with the needle tube 6, and the other side of the stopper 3 facing the outside of the slide groove 202 is provided with a second positioning groove 301 and a stop protrusion 302 arranged front and back, and the second positioning groove 301 is for the front end of the elastic arm 401 of the limiting spring sheet 4 to be inserted, and the stop protrusion 302 is used to cooperate with the slot 1011 of the catheter seat 101 and the front end of the elastic arm 401 of the limiting spring sheet 4, and the front side, rear side and both sides of the stopper 3 are provided with positioning surfaces 303 that cooperate with the slide groove 202, and the two sides of the stopper 3 are also provided with positioning convex ribs 304 that cooperate with the slide groove 202.

[0044] See also Figure 4 , Figures 7 to 9 The limiting spring piece 4 includes an elastic arm 401 and a limiting piece 402. The elastic arm 401 is installed in the first positioning groove 203 of the needle shield 2. The front end of the elastic arm 401 is bent and matched with the card groove 1011 of the catheter seat 101. The front end of the elastic arm 401 is matched with the second positioning groove 301 of the stopper 3, and the elastic arm 401 is elastically deformed by contacting the second positioning groove 301 through the front end, providing the stopper 3 with a force to slide into the slide groove 202 of the needle shield 2. The limiting piece 402 is interference-mounted in the slot 204 of the needle shield 2 and is provided with a stop hole 4021 corresponding to the needle through hole 201 of the needle shield 2. The edge of the stop hole 4021 may also be provided with a flange 4022 to ensure that the limiting piece 402 is interference-mounted in the slot 204 of the needle shield 2.

[0045] See also Figure 2 and Fig.10The needle seat 5 includes a seat body 501 and a handle portion 502. The seat body 501 is provided with an inner hole and a needle fixing hole connected front and back along the axis. The seat body 501 covers the needle protection sleeve 2 and the rear part of the catheter seat 101 through the inner hole. The needle fixing hole is used to fix the rear end of the needle tube 6. The handle portion 502 is connected to the side of the seat body 501. The needle tube 6 passes through the inner hole of the catheter 103, the inner hole of the metal wedge 102, the isolation plug 104, the needle through hole 201 of the needle protective sleeve 2, and the stop hole 4021 of the limiting spring piece 4, and provides support for the stop block 3. The front end of the needle tube 6 is a needle tip and is exposed from the front end of the catheter 103. The rear end of the needle tube 6 is fixed in the needle fixing hole of the seat body 501 fixed to the needle seat 5. A protruding buckle 601 protruding along the circumferential direction is provided on the outer wall of the needle tube 6 near the front end. The outer diameter of the protruding buckle 601 is larger than the stop hole 4021 of the limiting spring piece 4, and smaller than the inner hole of the catheter 103, the inner hole of the metal wedge 102, and the needle through hole 201 of the needle protective sleeve 2. In addition, the axial distance between the protruding buckle 601 and the front end of the needle tube 6 is slightly smaller than the axial distance between the stop block 3 and the limiting piece 402 of the limiting spring piece 4.

[0046] During assembly, first install the block 3 into the slide groove 202 of the needle shield 2, install the limiting sheet 402 of the limiting spring sheet 4 into the slot 204 of the needle shield 2, and the front end of the elastic arm 401 of the limiting spring sheet 4 is inserted into the second positioning groove 301 of the block 3, and provides a force for the block 3 to slide into the slide groove 202 of the needle shield 2. Then, lift the elastic arm 401 of the limiting spring sheet 4, extend the rear end of the needle tube 6 from the front end of the needle through hole 201 of the needle shield 2, and then pass through the stop hole 4021 of the limiting spring sheet 4, and then extend from the rear end of the needle through hole 201 of the needle shield 2, and the needle tube 6 provides support for the block 3. Then, insert the rear end of the needle tube 6 into the needle fixing hole after passing through the inner hole of the needle seat 5, and fix it with environmentally friendly quick-drying glue. Then, the rear part of the needle shield 2 is installed into the inner hole of the seat body 501 of the needle seat 5, and the rear end surface of the needle shield 2 is against the bottom surface of the inner hole of the seat body 501. After that, the front end of the needle tube 6 is inserted into the catheter seat assembly 1, which is an assembled complete set of components. The front end of the needle tube 6 is inserted from the rear end of the catheter seat 101, and then passes through the isolation plug 104 and the metal wedge 102 in sequence to the catheter 103. Finally, the front part of the needle shield 2 is installed into the catheter seat 101 from the rear end of the catheter seat 101, so that the seat body 501 of the needle seat 5 covers the rear part of the catheter seat 101. At this time, the needle tip of the needle tube 6 is exposed from the front end of the catheter 103, and the exposed length of the needle tip meets the standard requirements. The stop protrusion 302 of the stopper 3 and the front end of the elastic arm 401 of the limit spring are set in the groove 1011 of the catheter seat 101 and axially limited, so that the needle shield 2 maintains a good connection with the catheter seat 101 without external force. The assembly of the anti-needlestick device is completed, and the anti-needlestick device is in an unused state.

[0047] When the needle stick prevention device is used clinically for puncture, the handle 502 of the hand-held needle holder 5 drives the needle holder 5 and the needle tube 6 to move backward. Fig.11 When the needle tube 6 retreats to the point where the protruding buckle 601 is blocked by the stopping hole 4021 of the limiting spring sheet 4, the front end of the needle tube 6 retreats away from the stop block 3, and the stop block 3 loses the support of the needle tube 6. Under the elastic restoring force of the elastic arm portion 401 of the limiting spring sheet 4, the stopping protrusion 302 of the stop block 3 is disengaged from the card slot 1011 of the catheter seat 101, and the stop block 3 slides into the slide slot 202 of the needle protection sleeve 2, thereby blocking the front end of the needle through hole 201 of the needle protection sleeve 2 to prevent the front end of the needle tube 6 from extending forward. At this time, the front end of the needle tube 6 is shielded in the needle protection sleeve 2 by the stop block 3 and the limiting sheet portion 402 of the limiting spring sheet 4, and the needle tube 6 and the needle protection sleeve 2 cannot move relative to each other along the axis, and the anti-needlestick device enters a self-destructive state. At the same time, since the stop protrusion 302 of the stopper 3 is disengaged from the slot 1011 of the catheter seat 101 and the elastic arm 401 of the limiting spring piece 4 can be elastically deformed, the anti-detachment function between the stopper 3 and the catheter seat 101 fails, and the catheter seat assembly 1 can be separated as a whole.

[0048] See also Fig.12 , continue to hold the handle portion 502 of the needle seat 5 to drive the needle seat 5 and the needle tube 6 to move backward, and drive the limiting spring piece 4 through the protruding buckle 601 of the needle tube 6, and then drive the needle protection sleeve 2 and the block 3 thereon to move backward together. When the front end of the elastic arm portion 401 of the limiting spring piece 4 is elastically deformed and disengaged from the slot 1011 of the catheter seat 101, the needle protection sleeve 2 is pulled out from the rear end of the catheter seat 101, and is separated from the catheter seat assembly 1.

[0049] It should be noted that, for the needle tube 6 with the groove 602 at the front end, it is necessary to consider the situation when the groove 602 of the needle tube 6 passes through the stopper 3 in an extreme case during the needle tube 6 retreating process. For the stopper 3 of this embodiment, since the stopper 3 is a block and the surface that matches the needle tube 6 is a whole surface structure, and the length of this surface is greater than the length of the groove 602 of the needle tube 6, the surface and the front side surface of the stopper 3 are transitioned by an arc 305, see Fig.13 When the groove 602 of the needle tube 6 retreats and passes through the stopper 3, most of the side of the stopper 3 that cooperates with the needle tube 6 is located on the surface of the needle tube 6, and under the action of the elastic arm 401 of the limiting spring piece 4, it is tightly attached to the needle tube 6 until the groove 602 of the needle tube 6 completely passes through the arc 305 of the stopper 3. The stopper 3 will not be stuck in the groove 602 of the needle tube 6. In this way, the needle tube 6 can be pulled out smoothly without any sense of frustration, which is convenient for clinical use.

[0050] It should be noted that the fully described invention may also have a variety of variations and modifications, and is not limited to the specific embodiments described above. The above embodiments are merely illustrative of the invention, not limiting thereof. In short, the scope of protection of the invention should include those variations or substitutions and modifications that are obvious to a person of ordinary skill in the art.

Claims

1. A needle-stick prevention device with a limit spring and a stopper, characterized in that: include: The catheter seat assembly has an anti-drop structure at its rear end; A needle protection sleeve, wherein a needle through hole is provided therein and passes through along the axis, wherein the front portion of the needle protection sleeve is inserted from the rear end of the catheter seat assembly, wherein a slide groove is provided at the front end of the outer wall, wherein the slide groove separates the front end of the needle through hole into two sections, wherein a first positioning groove parallel to the axis is provided between the front end and the rear end of the outer wall, wherein a slot is provided at the rear end of the outer wall, wherein the slot separates the rear end of the needle through hole into two sections; The stopper is slidably mounted in the slide groove of the needle shield, and the side facing the inside of the slide groove of the needle shield cooperates with the needle tube, and the other side facing the outside of the slide groove of the needle shield cooperates with the anti-drop structure and the limiting spring sheet of the catheter seat assembly; The limiting spring piece is installed in the first positioning groove and the slot of the needle protective sleeve, and its front end cooperates with the anti-drop structure of the catheter seat assembly and contacts with the other side of the stopper. The front end of the spring piece contacts with the other side of the stopper to produce elastic deformation, thereby providing the stopper with a force to slide into the slide groove of the needle protective sleeve, and its rear end is provided with a stop hole corresponding to the needle through hole of the needle protective sleeve; A needle seat, covering the rear portion of the needle guard; The needle tube passes through the catheter seat assembly, the needle through hole of the needle protective sleeve, and the stop hole of the limit spring piece, and provides support for the stopper. Its rear end is fixed in the needle seat, and its outer wall near the front end is provided with a protruding buckle whose size is larger than the stop hole of the limit spring piece; The needle seat is pulled backwards, driving the needle tube to retreat axially together. When the needle tube retreats to the point where the protruding buckle is blocked by the stop hole of the limiting spring sheet, the front end of the needle tube retreats and leaves the block. The block loses the support of the needle tube, and under the elastic restoring force of the limiting spring sheet, the block is separated from the anti-detachment structure of the catheter seat assembly and slides into the slide groove of the needle shield, so that the block blocks the front end of the needle through hole of the needle shield to prevent the front end of the needle tube from extending forward. The needle shield, the block and the limiting spring sheet shield the front end of the needle tube. The needle seat continues to be pulled backward, driving the limiting spring piece through the raised buckle of the needle tube, and then driving the needle shield and the block thereon to move backward together. When the front end of the limiting spring piece is separated from the anti-detachment structure of the catheter seat assembly and the needle shield is pulled out from the rear end of the catheter seat assembly, it is separated from the catheter seat assembly.

2. The position-limiting spring piece and block-coordinated anti-needle puncture device according to claim 1, characterized in that: The anti-drop structure of the catheter seat assembly is a slot penetrating the side wall of the catheter seat, and the rear side of the other side of the stopper is provided with a stop protrusion matched with the slot of the catheter seat.

3. The anti-needle puncture device according to claim 1 or 2, characterized in that: The limiting spring piece includes an elastic arm portion and a limiting piece portion, the elastic arm portion is installed in the first positioning groove of the needle guard sleeve, the front end of the elastic arm portion cooperates with the anti-detachment structure of the catheter seat assembly and contacts with the other side of the stopper, and the elastic arm portion is elastically deformed by contacting the other side of the stopper through the front end, providing the stopper with a force to slide into the slide groove of the needle guard sleeve, and the limiting piece portion is installed in the slot of the needle guard sleeve and is provided with a stop hole.

4. The anti-needle puncture device of the position-limiting spring piece and the stopper cooperation type according to claim 3 is characterized in that: A second positioning groove is provided on the other side of the stopper for the front end of the elastic arm of the limiting spring to be inserted into.

5. The anti-needle puncture device of the position-limiting spring piece and the stopper cooperation type according to claim 3 is characterized in that: The edge of the stop hole of the limit spring is provided with a flange.

6. The anti-needle puncture device according to any one of claims 1, 2, 4 and 5, characterized in that: The front side, the rear side and both sides of the stopper are provided with positioning surfaces matched with the sliding groove of the needle protection sleeve.

7. The anti-needle puncture device of the position-limiting spring piece and the stopper cooperation type according to claim 6 is characterized in that: Positioning convex ribs matching with the sliding grooves of the needle protection sleeve are arranged on both sides of the stopper.

8. The needle-stick prevention device according to any one of claims 1, 2, 4, 5, and 7, characterized in that: The slide groove and the slot of the needle protection sleeve are both arranged along the radial surface.

9. The needle-stick prevention device according to any one of claims 1, 2, 4, 5, and 7, characterized in that: A groove connected to the inner hole is provided at the front end of the needle tube, and a side of the block that cooperates with the needle tube adopts an arc transition with the front side surface. When the needle tube retreats and passes through the block, one side of the block is tightly attached to the outer wall of the needle tube under the elastic restoring force of the limiting spring sheet and is located outside the groove of the needle tube, so that the needle tube retreats smoothly.

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