Novel disposable arteriovenous puncture needle

Abstract

The utility model relates to a novel disposable arteriovenous puncture needle which comprises a needle head assembly and a connector assembly, the needle head assembly and the connector assembly are connected through a catheter, the needle head assembly comprises a needle seat and a puncture needle arranged in the needle seat, a sleeve is arranged at the front end of the needle seat, and an isolation plug is arranged in the needle seat. The needle base is divided into a first cavity and a second cavity through the isolation plug, the puncture needle comprises a needle head and a needle handle, the cannula comprises a connecting part and a needle tube part, the connecting part is connected with the needle base, an expandable bag body is arranged at the end, close to the needle base, of the needle tube part and comprises an expansion part and an extrusion part, the extrusion part is fixed to the connecting part, and the expansion part is connected with the needle tube part. The expansion part is fixed on the needle tube part, and a tightening mechanism used for pressing the extrusion part and enabling fluid in the extrusion part to flow to the expansion part is arranged on the connecting part. After the technical scheme is adopted, the cannula can be prevented from loosening, blood exosmosis is also avoided, and the cannula has the advantage of being simple in structure.

Description

Technical Field

[0001] The utility model relates to a disposable consumable material in the field of hemodialysis, in particular to a novel disposable arteriovenous puncture needle. Background Art

[0002] During the hemodialysis process, a puncture needle is indispensable, and the puncture needle can be connected to the hemodialysis pipeline to establish a temporary vascular access. For example, in the Chinese utility model patent with the authorization announcement number CN207870943U and the name "Disposable Arteriovenous Puncture Needle", a disposable arteriovenous puncture needle is disclosed, including a catheter needle seat, a puncture needle installed inside the catheter needle seat, an isolation plug installed inside the catheter needle seat, and a needle seat installed at the tail of the catheter needle seat; the puncture needle is connected to the needle seat and passes through the isolation plug; the end of the catheter needle seat is provided with a sleeve matching the puncture needle; the side of the catheter needle seat is also connected to a hose, a stopper is installed on the hose, and an inner conical joint is also provided at its tail, and a joint protective cover is installed at the rear of the inner conical joint.

[0003] When the puncture needle of the above patent is in use, a small gap is left between the puncture needle and the puncture point, which will cause the puncture needle to move in the circumferential direction, thereby gradually expanding the puncture point, and may also cause extravasation of body fluids, causing inconvenience to the patient, and may also cause safety hazards and cause the sheath to fall off.

[0004] Based on the above issues, the applicant conducted research on the above issues and resulted in this case. Utility Model Content

[0005] The utility model aims to provide an anti-dropout puncture cannula assembly which is easy to operate and can reduce the risk of blood infiltration and the risk of cannula slippage.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A novel disposable arteriovenous puncture needle comprises a needle assembly and a connector assembly, which are connected by a catheter. The needle assembly comprises a needle seat and a puncture needle arranged in the needle seat. A sleeve is provided at the front end of the needle seat, and an isolation plug is provided in the needle seat. The needle seat is divided into a first chamber and a second chamber by the isolation plug. The puncture needle comprises a needle and a needle handle. The sleeve comprises a connecting part and a needle tube part. The connecting part is connected to the needle seat. An expandable bladder is provided at one end of the needle tube part close to the needle seat. The expandable bladder comprises an expansion part and an extrusion part. The extrusion part is fixed on the connecting part, and the expansion part is fixed on the needle tube part. A tightening mechanism for pressing the extrusion part and making the fluid in the extrusion part flow to the expansion part is provided on the connecting part.

[0008] As a preferred embodiment of the present invention, the tightening mechanism is a cable tie sleeved on the periphery of the extrusion portion.

[0009] As a preferred embodiment of the present invention, the tightening mechanism is a self-adhesive tape, one end of the self-adhesive tape is fixed to the connecting portion, and the other end is provided with an adhesive portion.

[0010] As a preferred embodiment of the present invention, the tightening mechanism is a binding belt having a first connecting end and a second connecting end for tying a knot.

[0011] As a preferred embodiment of the utility model, the connecting portion includes a cylindrical portion and a reduced diameter portion connected to the cylindrical portion, the needle tube portion is arranged on the reduced diameter portion, and the inflatable bladder also includes a connecting portion, which is arranged on the periphery of the reduced diameter portion, and the connecting portion is arranged between the extrusion portion and the expansion portion, and the inner cavity of the extrusion portion, the inner cavity of the connecting portion and the inner cavity of the expansion portion are connected.

[0012] As a preferred embodiment of the present invention, the extrusion portion extends along the circumference of the cylindrical portion.

[0013] As a preferred embodiment of the present invention, the extrusion portion is in an open ring shape, and the tightening mechanism is arranged to be staggered from the extrusion portion.

[0014] As a preferred embodiment of the present invention, the length extending along the cylindrical portion is one third to one half of the circumference of the cylindrical portion.

[0015] As a preferred embodiment of the present invention, the expansion portion and the connection portion are both in a closed loop shape.

[0016] As a preferred embodiment of the present invention, the thickness of the connecting portion is greater than the thickness of the expansion portion.

[0017] After adopting the technical solution of the utility model, by arranging the extrusion part of the expandable bladder on the connecting part of the sleeve, the structure is simple. During operation, the fluid in the extrusion part flows to the expansion part through the tightening mechanism, and the expansion part is expanded to a certain extent to fill the small gap between the puncture point and the sleeve, which can prevent the sleeve from loosening to a certain extent and also reduce the risk of blood extravasation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is a structural schematic diagram of another implementation method of the utility model.

[0020] Figure 3 It is a schematic diagram of the connecting part cooperating with the extruding part in the utility model.

[0021] In the figure:

[0022] Connector assembly 10 Conduit 11

[0023] Puncture needle 20 Needle handle 21

[0024] Needle 22 Needle seat 30

[0025] First chamber 31 Second chamber 32

[0026] Isolation plug 33 Connection part 41

[0027] Needle tube part 42 Cylindrical part 411

[0028] Reduced diameter portion 412 Expandable bladder 50

[0029] Extrusion portion 51 Connection portion 52

[0030] Expansion part 53 Self-adhesive tape 60

[0031] Adhesive part 61 Bandage 70 DETAILED DESCRIPTION

[0032] In order to better understand the technical solution of the present utility model, it is described in more detail below in conjunction with embodiments.

[0033] Reference Figures 1 to 3A novel disposable arteriovenous puncture needle includes a needle assembly 20 and a connector assembly 10, and the needle assembly 20 and the connector assembly 10 are connected by a catheter 11. The needle assembly 20 includes a needle seat 30 and a puncture needle 20 arranged in the needle seat 30, a sleeve is provided at the front end of the needle seat 30, and an isolation plug 33 is provided in the needle seat 30. The needle seat 30 is divided into a first chamber 31 and a second chamber 32 by the isolation plug 33. The puncture needle 20 includes a needle 22 and a needle handle 21, and the sleeve includes a connecting portion 41 and a needle tube portion 42. The needle 22 passes through the isolation plug 33. After the puncture is completed, the needle 22 is removed from the needle tube portion 42 and the isolation plug 33 through the needle handle 21. After the needle 22 is pulled out of the isolation plug 33, the isolation plug 33 can be self-sealed to limit the backflow of blood from the first chamber 31 to the second chamber 32. In the present invention, the connecting portion 41 is fixedly connected to the needle seat 30, and the end of the needle tube portion 42 close to the needle seat 30 is provided with an inflatable bladder 50, and the inflatable bladder 50 is made of existing materials that meet medical standards and can be deformed within a certain range. The inflatable bladder 50 can be made of a transparent material, and a closed cavity is formed in the inflatable bladder 50, and the cavity is filled with air or liquid, for example, a colored liquid can be used to better observe the flow of the fluid. In the present invention, the inflatable bladder 50 includes an expansion portion 53 and an extrusion portion 51, which are integrally formed and interconnected. The extrusion portion 51 is fixed on the connecting portion 41, for example, it can be fixed by gluing or hot pressing, and the expansion portion 53 is fixed on the needle tube portion 42, for example, it can be fixed by gluing or hot pressing, and a tightening mechanism for pressing the extrusion portion 51 and causing the fluid in the extrusion portion 51 to flow to the expansion portion 53 is provided on the connecting portion 41.

[0034] As a preferred embodiment of the utility model, the tightening mechanism is a cable tie (not shown in the figure) which is sleeved on the periphery of the extrusion portion 51. The cable tie can be purchased directly from the market or customized, and the size is adjusted accordingly according to the size of the inflatable bladder 50. It has a self-locking function and can be locked by being tightened to a certain position.

[0035] As another preferred embodiment of the utility model, the tightening mechanism is a self-adhesive tape 60, one end of which is fixed on the connecting portion 41, and the other end is provided with an adhesive portion 61. When in use, the self-adhesive tape 60 is wrapped around the extrusion portion 51. After tightening, the adhesive portion 61 is pasted on other positions of the self-adhesive tape 60 to achieve the extrusion of the extrusion portion 51 and the fixation of the extrusion state.

[0036] As another preferred embodiment of the utility model, the tightening mechanism is a strap 70 having a first connecting end and a second connecting end for tying a knot. When in use, the strap 70 is wrapped around the extrusion portion 51, and the first connecting end and the second connecting end are tied tightly to achieve the extrusion of the extrusion portion 51.

[0037] As a preferred embodiment of the present invention, the connecting portion 41 includes a cylindrical portion 411 and a reduced diameter portion 412 connected to the cylindrical portion 411, the reduced diameter portion 412 is in a conical shape, the cylindrical portion 411 and the connecting portion 52 are integrally formed, and the needle tube portion 42 is arranged on the reduced diameter portion 412. The inflatable bladder 50 also includes a connecting portion 52, which is arranged on the periphery of the reduced diameter portion 412, and the connecting portion 52 is arranged between the extrusion portion 51 and the expansion portion 53, and the inner cavity of the extrusion portion 51, the inner cavity of the connecting portion 52 and the inner cavity of the expansion portion 53 are connected. As a preferred embodiment of the present invention, the thickness of the connecting portion 52 is greater than the thickness of the expansion portion 53. After the extrusion portion 51 is squeezed, the fluid is squeezed toward the connecting portion 52 and the expansion portion 53, and both can be slightly deformed. By controlling the thickness of the connecting portion 52 and the expansion portion 53, the expansion portion 53 can be more easily deformed relative to the connecting portion 52.

[0038] As a preferred embodiment of the present invention, the extrusion portion 51 extends along the circumference of the cylindrical portion 411 .

[0039] As a preferred embodiment of the present invention, the extrusion portion 51 is in an open ring shape, and the tightening mechanism is staggered from the extrusion portion 51. As a preferred embodiment of the present invention, the length extending along the cylindrical portion 411 is one-third to one-half of the circumference of the cylindrical portion 411. With this structure, space can be reserved on the cylindrical portion 411 for installing the tightening mechanism, and it is also easier to squeeze the fluid to the connecting portion 52 and the expansion portion 53. In addition, the present invention can be designed through wall thickness, for example, the side of the expansion portion 53 close to the needle tube portion 42 is thicker, and the side of the expansion portion 53 that expands outwards is thinner, so that the deformation of the expansion portion 53 is basically outward expansion.

[0040] As a preferred embodiment of the present invention, the expansion portion 53 and the connection portion 52 are both in a closed loop shape to enhance the connection strength between the expansion portion 53, the connection portion 52 and the sleeve.

[0041] The protection scope of the present utility model is not limited to this embodiment, and any person making similar changes thereto shall be deemed to be within the protection scope of the present utility model.

Claims

1. A novel disposable arteriovenous puncture needle, comprising a needle assembly and a connector assembly, the needle assembly and the connector assembly are connected by a catheter, the needle assembly comprises a needle seat and a puncture needle arranged in the needle seat, a sleeve is provided at the front end of the needle seat, an isolation plug is provided in the needle seat, the needle seat is divided into a first chamber and a second chamber by the isolation plug, the puncture needle comprises a needle and a needle handle, the sleeve comprises a connecting portion and a needle tube portion, the connecting portion is connected to the needle seat, and is characterized in that: An inflatable bladder is provided at one end of the needle tube part close to the needle seat, and the inflatable bladder includes an expansion part and an extrusion part. The extrusion part is fixed on the connecting part, and the expansion part is fixed on the needle tube part. A tightening mechanism for pressing the extrusion part and making the fluid in the extrusion part flow to the expansion part is provided on the connecting part.

2. A novel disposable arteriovenous puncture needle as claimed in claim 1, characterized in that: The tightening mechanism is a cable tie sleeved on the periphery of the extrusion portion.

3. A novel disposable arteriovenous puncture needle as claimed in claim 1, characterized in that: The tightening mechanism is a self-adhesive tape, one end of which is fixed on the connecting portion, and the other end of which is provided with an adhesive portion.

4. A novel disposable arteriovenous puncture needle as claimed in claim 1, characterized in that: The tightening mechanism is a binding belt having a first connecting end and a second connecting end for tying a knot.

5. A novel disposable arteriovenous puncture needle as claimed in claim 1, characterized in that: The connecting part includes a cylindrical part and a reduced diameter part connected to the cylindrical part, the needle tube part is arranged on the reduced diameter part, and the inflatable bladder also includes a connecting part, which is arranged on the periphery of the reduced diameter part, and the connecting part is arranged between the extrusion part and the expansion part. The inner cavity of the extrusion part, the inner cavity of the connecting part and the inner cavity of the expansion part are connected.

6. A novel disposable arteriovenous puncture needle as claimed in claim 5, characterized in that: The pressing portion extends along the circumference of the cylindrical portion.

7. A novel disposable arteriovenous puncture needle as claimed in claim 6, characterized in that: The extrusion portion is in an open ring shape, and the tightening mechanism is arranged to be staggered from the extrusion portion.

8. A novel disposable arteriovenous puncture needle as claimed in claim 7, characterized in that: The length extending along the cylindrical portion is one third to one half of the circumference of the cylindrical portion.

9. A novel disposable arteriovenous puncture needle as claimed in claim 8, characterized in that: The expansion portion and the connection portion are both in a closed loop shape.

10. A novel disposable arteriovenous puncture needle as claimed in claim 9, characterized in that: The thickness of the connecting portion is greater than the thickness of the expansion portion.

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