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

Abstract

A spring-strip and stopper-coordinated needle-puncture prevention device 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, and a slot; a stopper, which can be slidably installed in the slide groove, one side of which cooperates with the needle tube, and the other side of which cooperates with the anti-slip structure and the spring-strip; a spring-strip, which is sleeved on the front end of the needle shield; a limit plate, which is installed in the slot and is provided with a stop hole; a needle seat, which sleeves the rear part of the needle shield; a needle tube, which passes through the catheter seat assembly, the spring-strip, the needle shield, and the limit plate, 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 limit plate, the front end of the needle tube retreats and leaves the stopper, and the stopper slides into the slide groove of the needle shield under the action of the spring-strip, 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 spring-piece and stopper-coordinated needle-puncture protection device. 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 combines a spring sheet with a stopper.

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

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

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

[0007] A needle protection sleeve, which is provided with a needle through hole extending along the axis, the front part of which is inserted from the rear end of the catheter seat assembly, the front end of the outer wall of which is provided with a slide groove, the slide groove divides the front end of the needle through hole into two sections, and the rear end of the outer wall of which is provided with a slot, the slot divides 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 spring sheet of the catheter seat assembly;

[0009] The spring piece is sleeved on the front end of the needle protection sleeve and is provided with a through hole corresponding to the needle through hole of the needle protection sleeve. The spring piece is elastically deformed by contacting with the other side of the stopper, thereby providing the stopper with a force to slide into the slide groove of the needle protection sleeve;

[0010] A stopper is installed in the slot of the needle protection sleeve and is provided with a stopper hole corresponding to the needle through hole;

[0011] A needle seat, covering the rear portion of the needle guard;

[0012] The needle tube passes through the catheter seat assembly, the through hole of the spring sheet, the needle through hole of the needle protective sleeve, and the stop hole of the limit plate, and provides support for the stopper. Its rear end is fixed in the needle seat, and a protruding buckle with a size larger than the stop hole of the limit plate is provided near the front end of its outer wall;

[0013] 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 limit plate, 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 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 limit plate shield the front end of the needle tube, and the needle seat continues to be pulled backward, driving the limit plate through the raised buckle of the needle tube, and then driving the needle guard sleeve and the block and spring sheet thereon to move backward together. When the needle guard sleeve is pulled out from the rear end of the catheter seat assembly, it is separated from the catheter seat assembly.

[0014] 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.

[0015] The spring piece includes a positioning sleeve and an elastic arm. The positioning sleeve is sleeved on the front end of the needle shield. The front end of the positioning sleeve is provided with a positioning end face matched with the front end face of the needle shield. The positioning end face is provided with a through hole corresponding to the needle through hole of the needle shield. The side wall of the positioning sleeve is provided with a notch corresponding to the position of the slide groove and the stopper of the needle shield. The elastic arm is arranged in the notch of the positioning sleeve and its front end is connected to the edge of the notch. The elastic arm is elastically deformed by contacting with the other side of the stopper, providing the stopper with a force to slide into the slide groove of the needle shield. The other side of the stopper may be provided with a positioning groove matched with the rear end of the elastic arm of the spring piece.

[0016] 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.

[0017] The slide groove and the slot of the needle protection sleeve may both be arranged along the radial surface.

[0018] The limiting piece may be in an L-shaped sheet shape, one side of the limiting piece is installed in the slot of the needle protection sleeve and is provided with a stop hole, and the other side of the limiting piece is arranged on the outer wall of the needle protection sleeve. The edge of the stop hole of the limiting piece may be provided with a flange.

[0019] 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 spring sheet and is located outside the groove of the needle tube, so that the needle tube retreats smoothly.

[0020] 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 make the needle seat 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 plate, 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 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 inside the needle shield, thereby improving the safety of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the decomposed structure of an embodiment of the present invention.

[0022] Figure 2 It is a full cross-sectional view of an embodiment of the present invention.

[0023] Figure 3 FIG. 4 is a schematic structural diagram of a catheter seat assembly in one embodiment of the present invention.

[0024] Figure 4 The figure is a schematic diagram of the assembly of the needle protection sleeve, the stopper, the spring piece, the limit piece and the needle tube in one embodiment of the present invention.

[0025] Figure 5 Schematic diagram of the structure of a needle protection sleeve in one embodiment of the present invention.

[0026] Figure 6 Schematic diagram of the structure of a stopper in one embodiment of the present invention.

[0027] Figure 7 FIG. 4 is a schematic diagram of the structure of a spring in an embodiment of the present invention.

[0028] Figure 8 It is a partial cross-sectional view of an embodiment of the present invention.

[0029] Fig. 9 Schematic diagram of the structure of a limiting piece in one embodiment of the present invention.

[0030] Fig.10 Schematic diagram of the structure of the needle seat and the needle tube in one embodiment of the present invention.

[0031] Fig.11 It is a partial cross-sectional view of an embodiment of the present invention entering a self-destruct state.

[0032] 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.

[0033] 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.

[0034] The parts in the figure are numbered as follows:

[0035] 1 catheter seat assembly, 101 catheter seat, 1011 slot, 102 metal wedge, 103 catheter, 104 isolation plug;

[0036] 2-pin protective sleeve, 201-pin through hole, 202-slide groove, 203-slot, 204-concave table;

[0037] 3 stopper, 301 positioning groove, 302 stop protrusion, 303 positioning surface, 304 positioning rib, 305 arc;

[0038] 4 spring pieces, 401 positioning sleeve, 4011 notch, 402 elastic arm;

[0039] 5 limiting piece, 501 stop hole, 502 flange;

[0040] 6 needle seat, 601 seat body, 602 handle;

[0041] 7 needle tube, 701 raised buckle, 702 groove. DETAILED DESCRIPTION

[0042] 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.

[0043] See also Figure 1 and Figure 2 A spring-and-block-coordinated needle-puncture prevention device comprises a catheter seat assembly 1, a needle protection sleeve 2, a block 3, a spring 4, a limiting piece 5, a needle seat 6, and a needle tube 7.

[0044] 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 302 of the stopper 3 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 .

[0045] 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 is provided in the needle protection sleeve 2 along the axis. A slide groove 202 is provided along the radial surface at the front end of the outer wall of the needle protection sleeve 2. The slide groove 202 divides the front end of the needle through hole 201 into two sections. The slide groove 202 is used to install the stopper 3. A slot 203 is provided along the radial surface at the rear end of the outer wall of the needle protection sleeve 2. The slot 203 divides the rear end of the needle through hole 201 into two sections. The slot 203 is used to install the limit plate 5.

[0046] See also Figure 4 , Figure 6 and Figure 8 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 7. The other side of the stopper 3 facing the outside of the slide groove 202 is provided with a front and rear arranged positioning groove 301 and a stop protrusion 302, the positioning groove 301 is for the rear end of the elastic arm 402 of the spring sheet 4 to be inserted, and the stop protrusion 302 is used to cooperate with the card groove 1011 of the catheter seat 101, 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 both sides of the stopper 3 are also provided with positioning convex ribs 304 that cooperate with the slide groove 202.

[0047] See also Figure 4 , Figure 7 and Figure 8 The spring piece 4 includes a positioning sleeve portion 401 and an elastic arm portion 402. The positioning sleeve portion 401 is sleeved on the front end of the needle protection sleeve 2. The front end of the positioning sleeve portion 401 is provided with a positioning end face that matches the front end face of the needle protection sleeve 2. The positioning end face is provided with a through hole corresponding to the needle through hole 201 of the needle protection sleeve 2. A notch 4011 corresponding to the position of the slide groove 202 and the stopper 3 is opened on the side wall of the positioning sleeve portion 401. The elastic arm portion 402 is arranged in the notch 4011 of the positioning sleeve portion 401 and its front end is connected to the edge of the notch 4011. The elastic arm portion 402 provides the stopper 3 with a force to slide into the slide groove 202 through elastic deformation, and the rear end of the elastic arm portion 402 matches the positioning groove 301 of the stopper 3.

[0048] See also Figure 4 and Fig. 9 The stopper 5 is in an L-shaped sheet shape, one side of the stopper 5 is installed in the slot 203 of the needle shield 2 with interference fit, and a stopper hole 501 corresponding to the needle through hole 201 of the needle shield 2 is provided on the stopper 501, and a flange 502 may be provided on the edge of the stopper hole 501 to ensure that one side of the stopper 5 is installed in the slot 203 of the needle shield 2 with interference fit. A concave table 204 parallel to the axis of the needle shield 2 and concave inward is also provided at the rear end of the outer wall of the needle shield 2. Figure 5The concave table 204 is arranged corresponding to the notch of the slot 203 to facilitate the assembly and disassembly of the limiting piece 5 , and the other side of the limiting piece 5 is arranged on the concave table 204 of the needle protection sleeve 2 .

[0049] See also Figure 2 and Fig. 9 The needle seat 6 includes a seat body 601 and a handle portion 602. The seat body 601 is provided with an inner hole and a needle fixing hole connected front and back along the axis. The seat body 601 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 7. The handle portion 602 is connected to the side of the seat body 601. The needle tube 7 passes through the inner hole of the catheter 103, the inner hole of the metal wedge 102, the isolation plug 104, the through hole of the spring piece 4, the needle through hole 201 of the needle protective sleeve 2, and the stop hole 501 of the limiting plate 5, and provides support for the stopper 3. The front end of the needle tube 7 is a needle tip and is exposed from the front end of the catheter 103. The rear end of the needle tube 7 is fixed in the needle fixing hole of the seat body 601 fixed to the needle seat 6. A protruding buckle 701 protruding along the circumferential direction is provided on the outer wall of the needle tube 7 near the front end. The outer diameter of the protruding buckle 701 is larger than the stop hole 501 of the limiting plate 5, and smaller than the inner hole of the catheter 103, the inner hole of the metal wedge 102, the through hole of the spring piece 4, and the needle through hole 201 of the needle protective sleeve 2. In addition, the axial distance between the protruding buckle 701 and the front end of the needle tube 7 is slightly smaller than the axial distance between the stopper 3 and the limiting plate 5.

[0050] During assembly, first install the block 3 into the slide groove 202 of the needle shield 2, and install one side of the limit plate 5 into the slot 203 of the needle shield 2. Then, extend the rear end of the needle tube 7 from the front end of the needle through hole 201 of the needle shield 2, and then extend from the rear end of the needle through hole 201 of the needle shield 2 after passing through the stop hole 501 of the limit plate 5. Next, insert the rear end of the needle tube 7 into the needle fixing hole after passing through the inner hole of the needle seat 6, and fix it with environmentally friendly quick-drying glue. Then, install the rear part of the needle shield 2 into the inner hole of the seat body 601 of the needle seat 6, and make the rear end face of the needle shield 2 against the bottom surface of the inner hole of the seat body 601. At the same time or successively, put the spring piece 4 on the front end of the needle shield 2, and the elastic arm 402 of the spring piece 4 contacts the block 3 to produce elastic deformation, and provide the block 3 with a force to slide into the slide groove 202. After that, the front end of the needle tube 7 is inserted into the catheter seat assembly 1, which is an assembled complete set of components. The front end of the needle tube 7 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 601 of the needle seat 6 covers the rear part of the catheter seat 101. At this time, the needle tip of the needle tube 7 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 is set in the card 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. At this point, the assembly of the anti-needlestick device is completed, and the anti-needlestick device is in an unused state.

[0051] When the needle stick prevention device is used clinically for puncture, the handle 602 of the hand-held needle holder 6 drives the needle holder 6 and the needle tube 7 to move backward. Fig.11 When the needle tube 7 retreats to the point where the protruding buckle 701 is blocked by the stop hole 501 of the limiting plate 5, the front end of the needle tube 7 retreats away from the block 3, and the block 3 loses the support of the needle tube 7. Under the elastic restoring force of the elastic arm 402 of the spring 4, the stop protrusion 302 of the block 3 is disengaged from the card slot 1011 of the catheter seat 101, and the block 3 slides inside the slide slot 202 of the needle shield 2, thereby blocking the front end of the needle through hole 201 of the needle shield 2, preventing the front end of the needle tube 7 from extending forward. At this time, the front end of the needle tube 7 is shielded in the needle shield 2 by the block 3 and the limiting plate 5, and the needle tube 7 and the needle shield 2 cannot move relative to each other along the axis, and the anti-needle puncture device enters a self-destructive state. At the same time, since the stop protrusion 302 of the block 3 is disengaged from the card slot 1011 of the catheter seat 101, the anti-detachment function between the block 3 and the catheter seat 101 fails, and the catheter seat assembly 1 can be separated as a whole.

[0052] See also Fig.12, continue to hold the handle portion 602 of the needle seat 6 to drive the needle seat 6 and the needle tube 7 to move backward, and drive the limiting plate 5 through the raised buckle 701 of the needle tube 7, and then drive the needle shield 2 and the block 3 and the spring 4 thereon to move backward together. When the needle shield 2 is pulled out from the rear end of the catheter seat 101, it is separated from the catheter seat assembly 1.

[0053] It should be noted that, for the needle tube 7 with the groove 702 at the front end, it is necessary to consider the situation when the groove 702 of the needle tube 7 passes through the stopper 3 in an extreme case during the needle tube 7 retreating process. For the stopper 3 of this embodiment, since the stopper 3 is a block and the surface that matches the needle tube 7 is a whole surface structure, and the length of this surface is greater than the length of the groove 702 of the needle tube 7, the surface and the front side surface of the stopper 3 are transitioned by an arc 305, see Fig.13 When the groove 702 of the needle tube 7 retreats and passes through the stopper 3, most of the side of the stopper 3 that cooperates with the needle tube 7 is located on the surface of the needle tube 7, and under the action of the spring piece 4, it is tightly attached to the needle tube 7 until the groove 702 of the needle tube 7 completely passes through the arc 305 of the stopper 3. The stopper 3 will not be stuck in the groove 702 of the needle tube 7. In this way, the needle tube 7 can be pulled out smoothly without any sense of frustration, which is convenient for clinical use.

[0054] 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 spring-piece and block-coordinated needle-puncture prevention device, characterized in that: include: The catheter seat assembly has an anti-drop structure at its rear end; A needle protection sleeve, which is provided with a needle through hole extending along the axis, the front part of which is inserted from the rear end of the catheter seat assembly, the front end of the outer wall of which is provided with a slide groove, the slide groove divides the front end of the needle through hole into two sections, and the rear end of the outer wall of which is provided with a slot, the slot divides 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 spring sheet of the catheter seat assembly; The spring piece is sleeved on the front end of the needle protection sleeve and is provided with a through hole corresponding to the needle through hole of the needle protection sleeve. The spring piece is elastically deformed by contacting with the other side of the stopper, thereby providing the stopper with a force to slide into the slide groove of the needle protection sleeve; A stopper is installed in the slot of the needle protection sleeve and is provided with a stopper hole corresponding to the needle through hole; A needle seat, covering the rear portion of the needle guard; The needle tube passes through the catheter seat assembly, the through hole of the spring sheet, the needle through hole of the needle protective sleeve, and the stop hole of the limit plate, and provides support for the stopper. Its rear end is fixed in the needle seat, and a protruding buckle with a size larger than the stop hole of the limit plate is provided near the front end of its outer wall; 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 plate, 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 spring sheet, the block is separated from the anti-detachment structure of the catheter seat assembly and slides into the sliding 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 plate shield the front end of the needle tube. The needle seat continues to be pulled backward, driving the limit plate through the raised buckle of the needle tube, and then driving the needle shield and the block and spring plate thereon to move backward together. When 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 elastic sheet and block cooperation type needle stick prevention 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 elastic sheet and block cooperation type needle stick prevention device according to claim 1 or 2, characterized in that: The spring piece includes a positioning sleeve and an elastic arm portion, the positioning sleeve portion is sleeved on the front end of the needle shield, the front end of the positioning sleeve portion is provided with a positioning end face matching the front end face of the needle shield, the positioning end face is provided with a through hole corresponding to the needle through hole of the needle shield, and the side wall of the positioning sleeve portion is provided with a notch corresponding to the position of the slide groove and the stopper of the needle shield, the elastic arm portion is arranged in the notch of the positioning sleeve portion and its front end is connected to the edge of the notch, the elastic arm portion is elastically deformed by contacting with the other side of the stopper, and provides the stopper with a force to slide into the slide groove of the needle shield.

4. The elastic sheet and block cooperation type needle stick prevention device according to claim 3, characterized in that: A positioning groove matched with the rear end of the elastic arm of the spring sheet is arranged on the other side of the stopper.

5. The elastic sheet and block cooperation type needle stick prevention device according to any one of claims 1, 2 and 4, 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.

6. The elastic sheet and block cooperation type needle stick prevention device according to claim 5, characterized in that: Positioning convex ribs matching with the sliding grooves of the needle protection sleeve are arranged on both sides of the stopper.

7. The elastic sheet and block cooperation type needle stick prevention device according to any one of claims 1, 2, 4 and 6, characterized in that: The slide groove and the slot of the needle protection sleeve are both arranged along the radial surface.

8. The elastic sheet and block cooperation type needle stick prevention device according to any one of claims 1, 2, 4 and 6, characterized in that: The limiting piece is in an L-shaped sheet shape, one side of the limiting piece is installed in the slot of the needle protective sleeve and is provided with a stop hole, and the other side of the limiting piece is arranged on the outer wall of the needle protective sleeve.

9. The elastic sheet and block cooperation type needle stick prevention device according to claim 8, characterized in that: The edge of the stop hole of the limit plate is provided with a flange.

10. The elastic sheet and block cooperation type needle stick prevention device according to claim 1, 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 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 spring sheet and is located outside the groove of the needle tube, so that the needle tube retreats smoothly.

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