Limiting spring plate and stop block matched type needling prevention deviceTechnical Field
The invention relates to the technical field of needle protection, in particular to a limit spring and stop block matched type needling prevention device.
Background
The existing product with the needle tube is exposed outside after being used and pulled out, the needle point of the needle tube is easy to stab the person, and particularly the medical needle product has serious potential safety hazard, and the used medical needle product has the possibility of cross infection once stabbing the person.
Disclosure of Invention
The invention aims at the problems and provides a limit spring and stop block matched type needling prevention device.
The aim of the invention can be achieved by the following technical scheme:
A limit spring and stop-fit type needling prevention device, comprising:
The rear end of the catheter seat assembly is provided with an anti-falling structure;
the needle protecting sleeve is internally provided with a needle through hole which runs through along the axis, the front part of the needle protecting sleeve is arranged in the needle protecting sleeve from the rear end of the catheter seat assembly, the front end of the outer wall of the needle protecting sleeve is provided with a sliding groove, the sliding groove divides the front end of the needle through hole into two sections, a first positioning groove parallel to the axis is arranged between the front end and the rear end of the outer wall of the needle protecting sleeve, the rear end of the outer wall of the needle protecting sleeve is provided with a slot, and the slot divides the rear end of the needle through hole into two sections;
The stop block is slidably arranged in the chute of the needle protection sleeve, one surface of the stop block facing the chute of the needle protection sleeve is matched with the needle tube, and the other surface of the stop block facing the chute of the needle protection sleeve is matched with the anti-falling structure and the limiting elastic piece of the catheter seat assembly;
The limiting elastic sheet is arranged in the first positioning groove and the slot of the needle protecting sleeve, the front end of the limiting elastic sheet is matched with the anti-falling structure of the catheter seat assembly and is contacted with the other surface of the stop block, elastic deformation is generated by the contact of the front end with the other surface of the stop block, acting force for sliding towards the inside of the sliding groove of the needle protecting sleeve is provided for the stop block, and a stop hole corresponding to the needle through hole of the needle protecting sleeve is arranged at the rear end of the limiting elastic sheet;
A needle seat sleeved at the rear part of the needle protecting sleeve;
The needle tube passes through the catheter seat assembly, the needle through hole of the needle protecting sleeve and the stop hole of the limit elastic sheet and provides support for the stop block, the rear end of the needle tube is fixed in the needle seat, and a convex buckle with the size larger than that of the stop hole of the limit elastic sheet is arranged at the position, close to the front end, of the outer wall of the needle tube;
The needle seat is pulled backwards to drive the needle tube to move backwards along the axial direction together, when the needle tube moves backwards to the stop position Kong Dangzhu of the protruding buckle by the limiting elastic piece, the front end of the needle tube moves backwards away from the stop block, the stop block loses the support of the needle tube, under the elastic restoring force of the limiting elastic piece, the stop block is separated from the anti-disengaging structure of the catheter seat assembly and slides towards the inside of the sliding groove of the needle protecting sleeve, the stop block blocks the front end of the needle through hole of the needle protecting sleeve, the front end of the needle tube is prevented from extending forwards, the needle protecting sleeve, the stop block and the limiting elastic piece realize shielding of the front end of the needle tube, the needle seat continues to be pulled backwards, the protruding buckle of the needle tube drives the limiting elastic piece, and then drives the needle protecting sleeve and the stop block on the needle protecting sleeve to move backwards together, and when the front end of the limiting elastic piece is separated from the anti-disengaging structure of the catheter seat assembly, and the needle protecting sleeve is pulled out from the rear end of the catheter seat assembly.
According to the technical scheme, the anti-falling structure of the catheter seat assembly can be a clamping groove penetrating through the side wall of the catheter seat, and the back side of the other surface of the stop block is provided with a stop protrusion matched with the clamping groove of the catheter seat.
The limiting elastic piece comprises an elastic arm part and a limiting piece part, the elastic arm part is arranged in a first positioning groove of the needle protecting sleeve, the front end of the elastic arm part is matched with the anti-falling structure of the catheter seat assembly and is contacted with the other surface of the stop block, the elastic arm part is contacted with the other surface of the stop block through the front end to generate elastic deformation, the stop block is provided with an acting force for sliding inside a sliding groove of the needle protecting sleeve, and the limiting piece part is arranged in the slot of the needle protecting sleeve and is provided with a stop hole. The other surface of the stop block can be provided with a second positioning groove for clamping the front end of the elastic arm part of the limiting elastic piece. The edge of the stop hole of the limiting elastic sheet can be provided with a flange.
The front side, the rear side and the two sides of the stop block can be provided with positioning surfaces matched with the sliding grooves of the needle protecting sleeve. The two sides of the stop block can be provided with positioning convex ribs matched with the sliding grooves of the needle protecting sleeve.
The sliding groove and the slot of the needle protecting sleeve can be arranged along the radial surface.
The front end of the needle tube is provided with a groove communicated with the inner hole, one surface of the stop block matched with the needle tube can be in arc transition with the front side surface, when the needle tube retreats to pass through the stop block, one surface of the stop block is tightly attached to the outer wall of the needle tube under the action of the elastic restoring force of the limiting elastic piece and is positioned outside the groove of the needle tube, so that the needle tube retreats smoothly.
Compared with the prior art, the needle holder has the beneficial effects that the whole structure is compact, the operation is simple, the needle holder is pulled backwards, the needle holder drives the needle tube to move backwards along the axial direction, when the needle tube moves backwards to the stop position Kong Dangzhu of the limiting elastic piece of the protruding buckle, the front end of the needle tube moves backwards away from the stop block, the stop block loses the support of the needle tube and slides towards the inside of the chute of the needle protecting sleeve under the elastic restoring force of the limiting elastic piece, so that the front end of the needle through hole of the needle protecting sleeve is blocked, the front end of the needle tube is prevented from extending forwards, the front needle point of the needle tube is shielded in the needle protecting sleeve, and the safety of a product is improved.
Drawings
Fig. 1 is an exploded view of an embodiment of the present invention.
Fig. 2 is a full cross-sectional view of an embodiment of the present invention.
Fig. 3 is a schematic structural view of a catheter hub assembly according to an embodiment of the present invention.
FIG. 4 is a schematic diagram illustrating the assembly of a needle shield, a stopper spring, and a needle tube according to an embodiment of the present invention.
FIG. 5 is a schematic view of a needle shield according to an embodiment of the present invention.
Fig. 6 is a schematic structural view of a stopper according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a limiting spring according to an embodiment of the invention.
Fig. 8 is a schematic diagram of another structure of a limiting spring according to an embodiment of the invention.
Fig. 9 is a partial cross-sectional view of an embodiment of the present invention.
Fig. 10 is a schematic view showing the structure of the needle holder and the needle tube in an embodiment of the present invention.
FIG. 11 is a partial cross-sectional view of an embodiment of the present invention in a self-destructed state.
FIG. 12 is a schematic view of an embodiment of the present invention after entering a self-destruction state and separated from a catheter hub assembly.
FIG. 13 is a schematic view of a process of a slot of a syringe passing a stop in an embodiment of the invention.
The components in the figures are numbered as follows:
1, a catheter seat assembly, a 101 catheter seat, 1011 clamping grooves, 102 metal wedges, 103 catheters and 104 isolation plugs;
A 2-needle protecting sleeve, a 201-needle through hole, a 202 sliding groove, a 203 first positioning groove and a 204 slot;
3a stop block, 301 a second positioning groove, 302 a stop protrusion, 303 a positioning surface, 304 a positioning convex rib and 305 an arc;
4 limiting spring plates, 401 elastic arm parts, 402 limiting plate parts, 4021 positioning holes and 4022 flanges;
A 5 needle seat, a 501 seat body part and a 502 handle part;
6 needle tube, 601 protruding buckle, 602 groove.
Detailed Description
The following detailed description of the invention, taken in conjunction with the accompanying drawings, will provide those skilled in the art with a more readily understood understanding of how the invention may be practiced. While the present invention has been described in connection with the preferred embodiments thereof, these embodiments are set forth only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, a limit spring and stop block matched type anti-needling device comprises a catheter seat assembly 1, a needle protecting sleeve 2, a stop block 3, a limit spring 4, a needle seat 5 and a needle tube 6.
Referring to fig. 2 and 3, the catheter hub assembly 1 includes a catheter hub 101, a metal wedge 102, a catheter 103, and a spacer 104, the metal wedge 102 and the spacer 104 being mounted in a tandem arrangement within the catheter hub 101, the catheter 103 extending from a front end of the catheter hub 101 and being fixed at a rear end thereof to the metal wedge 102. The rear end of the inner wall of the catheter seat 101 is provided with an anti-disengaging structure, which is used for being matched with the retaining protrusion 302302 of the stop block 3 and the front end of the elastic arm 401 of the limiting elastic sheet 4 so as to ensure that the needle protecting sleeve 2 is connected with the catheter seat 101, and the anti-disengaging structure is a clamping groove 1011 penetrating through the side wall of the catheter seat 101, as shown in fig. 3.
Referring to fig. 2, the front portion of the needle shield 2 is fitted into the catheter hub 101 from the rear end of the catheter hub 101. Referring to fig. 4 and 5, the needle protecting sleeve 2 is in a cylindrical shape, a needle through hole 201 penetrating along an axis is arranged in the needle protecting sleeve 2, a sliding groove 202 arranged along a radial surface is arranged at the front end of the outer wall of the needle protecting sleeve 2, the sliding groove 202 divides the front end of the needle through hole 201 into two sections, the sliding groove 202 is used for installing the stop block 3, a first positioning groove 203 parallel to the axis is arranged between the front end and the rear end of the outer wall of the needle protecting sleeve 2, the first positioning groove 203 is used for installing an elastic arm 401 of the limiting elastic sheet 4, a slot 204 arranged along the radial surface is arranged at the rear end of the outer wall of the needle protecting sleeve 2, the slot 204 divides the rear end of the needle through hole 201 into two sections, and the slot 204 is used for installing a limiting sheet 402 of the limiting elastic sheet 4.
Referring to fig. 4, 6 and 9, the stop block 3 is slidably mounted in the chute 202 of the needle protecting sleeve 2, one surface of the stop block 3 facing the chute 202 is matched with the needle tube 6, a second positioning groove 301 and a stop protrusion 302 are disposed on the other surface of the stop block 3 facing the outside of the chute 202, the second positioning groove 301 is used for clamping the front end of the elastic arm 401 of the limit spring 4, the stop protrusion 302 is used for being matched with the clamping groove 1011 of the catheter seat 101 and the front end of the elastic arm 401 of the limit spring 4, the front side, the rear side and the two sides of the stop block 3 are provided with positioning surfaces 303 matched with the chute 202, and the two sides of the stop block 3 are also provided with positioning ribs 304 matched with the chute 202.
Referring to fig. 4 and 7 to 9, the limit spring 4 includes a resilient arm 401 and a limit tab 402. The elastic arm 401 is mounted in the first positioning groove 203 of the needle protecting sleeve 2, the front end of the elastic arm 401 is bent and is matched with the clamping 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 stop block 3, and the elastic arm 401 is contacted with the second positioning groove 301 through the front end to generate elastic deformation, so that the stop block 3 is provided with a force sliding towards the inside of the sliding groove 202 of the needle protecting sleeve 2. The limiting plate 402 is installed in the slot 204 of the needle protection sleeve 2 in an interference manner, a stop hole 4021 corresponding to the needle through hole 201 of the needle protection sleeve 2 is formed in the limiting plate, a flange 4022 can be further arranged at the edge of the stop hole 4021, and the limiting plate 402 is guaranteed to be installed in the slot 204 of the needle protection sleeve 2 in an interference manner.
Referring to fig. 2 and 10, the needle holder 5 includes a holder body 501 and a handle 502, wherein an inner hole and a needle fixing hole are disposed in the holder body 501, which are communicated with each other along the axis, the holder body 501 is sleeved on the rear parts of the needle protecting sleeve 2 and the catheter holder 101 through the inner hole, the needle fixing hole is used for fixing the rear end of the needle tube 6, and the handle 502 is connected to the side of the holder 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 protecting sleeve 2 and the stop hole 4021 of the limiting spring plate 4, and provides support for the stop block 3, the front end of the needle tube 6 is a needle point and is exposed out of 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 of the needle seat 5, a protruding buckle 601 protruding along the circumferential direction is arranged at the position close to the front end of the outer wall of the needle tube 6, the outer diameter of the protruding buckle 601 is larger than the stop hole 4021 of the limiting spring plate 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 protecting sleeve 2, and 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 spring plate 402 of the limiting spring plate 4.
During assembly, the stop block 3 is firstly arranged in the sliding groove 202 of the needle protecting sleeve 2, the limiting piece part 402 of the limiting elastic piece 4 is arranged in the slot 204 of the needle protecting sleeve 2, the front end of the elastic arm part 401 of the limiting elastic piece 4 is clamped into the second positioning groove 301 of the stop block 3, and the acting force for sliding towards the inside of the sliding groove 202 of the needle protecting sleeve 2 is provided for the stop block 3. Then, the elastic arm 401 of the limit spring 4 is lifted, the rear end of the needle tube 6 extends into the front end of the needle through hole 201 of the needle protecting sleeve 2, and after passing through the stop hole 4021 of the limit spring 4, the needle tube 6 extends out of the rear end of the needle through hole 201 of the needle protecting sleeve 2, and the needle tube 6 provides support for the stop block 3. Then, the rear end of the needle tube 6 is inserted into the needle fixing hole after passing through the inner hole of the needle seat 5, and is fixed by environment-friendly quick-drying glue. The rear part of the needle protecting sleeve 2 is then installed into the inner hole of the seat body 501 of the needle seat 5, and the rear end surface of the needle protecting sleeve 2 is propped against the bottom surface of the inner hole of the seat body 501. Thereafter, the forward end of the needle cannula 6 is extended into the catheter hub assembly 1, the catheter hub assembly 1 being an assembled kit, and the forward end of the needle cannula 6 is extended from the rearward end of the catheter hub 101 and forward through the septum 104 and the metal wedge 102 in sequence and into the catheter 103. Finally, the front part of the needle protecting sleeve 2 is arranged in the catheter seat 101 from the rear end of the catheter seat 101, so that the seat body 501 of the needle seat 5 is sleeved on the rear part of the catheter seat 101, at the moment, the needle tip of the needle tube 6 is exposed from the front end of the catheter 103, the exposed length of the needle tip meets the standard requirement, and the front ends of the stopping protrusion 302 of the stop block 3 and the elastic arm 401 of the limiting spring are arranged in the clamping groove 1011 of the catheter seat 101 to axially limit, so that the needle protecting sleeve 2 is well connected with the catheter seat 101 under the condition of no external force. Thus, the assembly of the needling prevention device is completed, and the needling prevention device is in an unused state.
After the puncture preventing device clinically completes the puncture use, the handle part 502 of the hand-held needle seat 5 drives the needle seat 5 and the needle tube 6 to move backwards. Referring to fig. 11, when the needle tube 6 retreats to the protruding buckle 601 and is blocked by the stop hole 4021 of the limit elastic piece 4, the front end of the needle tube 6 retreats away from the stop block 3, the stop block 3 loses the support of the needle tube 6, under the elastic restoring force of the elastic arm 401 of the limit elastic piece 4, the stop protrusion 302 of the stop block 3 is separated from the clamping groove 1011 of the catheter seat 101, the stop block 3 slides inside the sliding groove 202 of the needle shield 2, thereby blocking the front end of the needle through hole 201 of the needle shield 2 and preventing 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 shield 2 by the stop block 3 and the stop piece 402 of the limit elastic piece 4, the needle tube 6 and the needle shield 2 cannot move relatively along the axis, and the needle penetration preventing device enters a self-destruction state. Meanwhile, the retaining protrusion 302 of the stop block 3 is separated from the clamping groove 1011 of the catheter seat 101, and the elastic arm 401 of the limiting elastic sheet 4 can elastically deform, so that the anti-falling function between the stop block 3 and the catheter seat 101 fails, and the whole catheter seat assembly 1 can be separated.
Referring to fig. 12, continuing to hold the handle 502 of the needle holder 5 drives the needle holder 5 and the needle tube 6 to move backward, the protruding buckle 601 of the needle tube 6 drives the limit elastic piece 4, and further drives the needle protecting sleeve 2 and the stop 3 thereon to move backward together, when the front end of the elastic arm 401 of the limit elastic piece 4 breaks away from the clamping groove 1011 of the catheter holder 101 through elastic deformation, the needle protecting sleeve 2 is pulled out from the rear end of the catheter holder 101, and separation from the catheter holder assembly 1 is achieved.
It should be noted that, regarding the needle tube 6 having the groove 602 at the front end, consideration is given to the case where the groove 602 of the needle tube 6 passes the stopper 3 in an extreme case during the retraction of the needle tube 6. For the stopper 3 of this embodiment, since the stopper 3 is a block and the face matching with the needle tube 6 is of a whole face structure, and the length of the face is greater than the length of the groove 602 of the needle tube 6, the face and the front side face of the stopper 3 adopt the arc 305 for transition, see fig. 13, when the groove 602 of the needle tube 6 retreats past the stopper 3, most of the face matching with the needle tube 6 of the stopper 3 is located on the surface of the needle tube 6, and is tightly stuck to the needle tube 6 under the action force of the elastic arm 401 of the limit spring 4 until the groove 602 of the needle tube 6 completely passes through the arc 305 of the stopper 3, the stopper 3 cannot be blocked into the groove 602 of the needle tube 6, so that the needle tube 6 can be smoothly pulled out, no abrupt feeling is generated, and clinical use is facilitated.
It should be noted that numerous variations and modifications are possible in light of the fully described invention, and are not limited to the specific examples of implementation described above. The above-described embodiments are merely illustrative of the present invention and are not intended to be limiting. In general, the scope of the present invention should include those variations or alternatives and modifications apparent to those skilled in the art.