Remaining needle for dialysis

Abstract

The utility model provides an indwelling needle for dialysis, which comprises a puncture needle tube, a catheter component and a needle seat matched with the catheter component, and the puncture needle tube is made of polymer plastics; the puncture needle tube comprises a tube body part and a needle head part, the needle head part is provided with a diagonal plane, the diagonal plane is obliquely arranged from the end, away from the tube body part, of the needle head part to the tube body part, the joint of the needle head part and the diagonal plane is of a fillet structure, and the end, away from the needle head part, of the tube body part penetrates through the catheter assembly and then penetrates into and is fixed in the needle base; a plurality of reinforcing ribs are further arranged in the puncture needle tube, each reinforcing rib is arranged in the axial direction of the puncture needle tube, and the reinforcing ribs are evenly arranged in the circumferential direction of the puncture needle tube at intervals. The remaining needle for dialysis can be applied to buttonhole method puncture, puncture application scenes are enriched, stimulation to the blood vessel wall of a patient is small when the remaining needle is used, and the inner wall of the blood vessel can be prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an indwelling needle for dialysis. Background Art

[0002] Hemodialysis is one of the renal replacement therapies for patients with acute and chronic renal failure. In traditional hemodialysis treatment, intravenous fistula needles are commonly used, but with the advancement of modern medical technology, dialysis indwelling needles are being widely used.

[0003] Existing dialysis catheters all use steel needles for auxiliary puncture. The steel needles are made of austenitic stainless steel. However, due to their sharp needle structure and sharp tips, they can easily puncture or pierce the inner wall of blood vessels during actual use, causing swelling of the fistula blood vessels and large-area subcutaneous congestion. As a result, existing dialysis catheters are only suitable for rope-ladder puncture and cannot be used for buttonhole puncture. In addition, the manufacturing cost of steel needles is high, and there is metal stimulation, which can cause certain damage to arteriovenous fistulas and directly affect the service life of vascular access. Utility Model Content

[0004] Based on this, the purpose of the present utility model is to provide a dialysis indwelling needle, which aims to solve the technical problems in the prior art that the dialysis indwelling needle is only suitable for rope ladder puncture and cannot be used for buttonhole puncture, the manufacturing cost of the steel needle is high, there is metal stimulation, and there is certain damage to the arteriovenous fistula, which will directly affect the service life of the vascular access.

[0005] The purpose of the utility model is to provide a dialysis indwelling needle, comprising a puncture needle tube, a catheter assembly and a needle seat adapted to the catheter assembly, wherein the puncture needle tube is made of polymer plastic;

[0006] The puncture needle tube includes a tube body and a needle head integrally connected to the tube body, the needle head is provided with an oblique cut surface, the oblique cut surface is inclined from the end of the needle head away from the tube body toward the tube body, the connection between the needle head and the oblique cut surface is a rounded structure, the end of the tube body away from the needle head passes through the catheter assembly and then penetrates into and is fixed in the needle seat;

[0007] A plurality of reinforcing ribs are further provided in the puncture needle tube, each of the reinforcing ribs is arranged along the axial direction of the puncture needle tube, and a plurality of the reinforcing ribs are evenly spaced along the circumference of the puncture needle tube.

[0008] Compared with the prior art, the beneficial effect of the dialysis indwelling needle of the present invention is that the needle head and the beveled surface are connected by a rounded structure to reduce the sharpness of the needle tip, so that the dialysis indwelling needle in the present application can be used for buttonhole puncture, enriching the puncture application scenarios and avoiding the situation that the sharp needle tip cannot be used for buttonhole puncture; specifically, the puncture needle tube includes a tube body and a needle head integrally connected to the tube body, the needle head is provided with a beveled surface, the beveled surface is inclined from the end of the needle head away from the tube body toward the tube body, and the connection between the needle head and the beveled surface is a rounded structure; further, the material of the puncture needle tube is polymer plastic, which has less irritation to the patient's blood vessel wall during use, can avoid damage to the inner wall of the blood vessel, reduce the incidence of blood vessel swelling and bleeding, and can extend the service life of the patient's arteriovenous fistula. Compared with steel needles, it has better biocompatibility and a lower incidence of allergies in patients.

[0009] In addition, the above-mentioned dialysis indwelling needle according to the present invention may also have the following additional technical features:

[0010] Furthermore, the catheter assembly includes a catheter, a catheter seat connected to one end of the catheter, a hose connected to the catheter seat, and a hose seat connected to the hose. The catheter, the catheter seat, the hose and the hose seat are connected in sequence to form a channel for the puncture needle tube to pass through. After the end of the tube body away from the needle head penetrates from the catheter, it penetrates into the needle seat along the channel and is fixed in the needle seat by bonding.

[0011] Furthermore, the end of the tube body connected to the needle head is provided with at least one side hole, and the end of the tube body fixed in the needle seat is a closed end.

[0012] Furthermore, the dialysis indwelling needle also includes a blood returner, one end of which is connected to the needle seat, and the other end of which is provided with a breathable membrane, and the end of the tube body fixed in the needle seat is connected to the interior of the blood returner.

[0013] Furthermore, the angle between the oblique cutting surface and the axial direction of the puncture needle tube is 20°-25°.

[0014] Furthermore, the puncture needle tube is a solid tube structure.

[0015] Furthermore, the puncture needle tube is a hollow tube structure.

[0016] Furthermore, a connecting portion is provided on the outer wall of one end of the hose seat away from the hose, and a mounting groove is provided at one end of the needle seat, and the mounting groove is adapted to the connecting portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a cross-sectional structural diagram of a dialysis indwelling needle according to the first embodiment of the present invention;

[0018] Figure 2 This is a schematic structural diagram of the puncture needle tube in the dialysis indwelling needle of the first embodiment of the utility model;

[0019] Figure 3 This is a schematic cross-sectional view of the puncture needle tube of the dialysis indwelling needle according to the first embodiment of the present invention along its axial direction;

[0020] Figure 4 This is a schematic structural diagram of the puncture needle tube in the dialysis indwelling needle of the first embodiment of the utility model at a certain viewing angle;

[0021] Figure 5 This is a diagram showing the internal structure of the puncture needle tube in the dialysis indwelling needle of the first embodiment of the utility model;

[0022] Figure 6 This is a schematic structural diagram of a catheter assembly in a dialysis indwelling needle according to a first embodiment of the present invention;

[0023] Figure 7 This is a diagram showing the internal structure of the puncture needle tube in the dialysis indwelling needle according to the second embodiment of the present invention;

[0024] Figure 8 This is a diagram showing the internal structure of the puncture needle tube in the dialysis indwelling needle of the third embodiment of the present utility model;

[0025] Figure 9 This is a cross-sectional structural diagram of a dialysis indwelling needle according to the fourth embodiment of the present invention.

[0026] Among them, the above-mentioned drawings include the following figure marks: 10-puncture needle tube; 11-tube body; 12-needle head; 101-bevel section; 102-reinforcement rib; 103-side hole; 20-catheter assembly; 21-catheter; 22-catheter seat; 23-hose; 24-hose seat; 241-connecting part; 201-channel; 30-needle seat; 301-installation slot; 302-fixing hole; 40-blood returner; 41-breathable membrane.

[0027] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0028] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate several embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Example 1

[0032] See also Figures 1 to 6 , shown is a dialysis indwelling needle in the first embodiment of the present invention, comprising a puncture needle tube 10, a catheter assembly 20 and a needle seat 30 adapted to the catheter assembly 20. The puncture needle tube 10 is made of polymer plastic. During actual use, the puncture needle tube 10 made of polymer plastic has less irritation to the patient's blood vessel wall, which can avoid damaging the inner wall of the blood vessel, thereby reducing the incidence of blood vessel swelling and bleeding.

[0033] Specifically, the puncture needle tube 10 includes a tubular body 11 and a needle head 12 integrally connected to the tubular body 11. The needle head 12 is provided with a beveled surface 101. The beveled surface 101 is inclined toward the tubular body 11 from the end of the needle head 12 away from the tubular body 11. Furthermore, the angle a between the beveled surface 101 and the axial direction of the puncture needle tube 10 is 20°-25°. In this embodiment, the angle a between the beveled surface 101 and the axial direction of the puncture needle tube 10 is 20°. The provision of the beveled surface 101 enables the puncture needle tube 10 to pass through the buttonhole tunnel easily during actual use.

[0034] The connection between the needle head 12 and the beveled surface 101 is a rounded structure. The end of the tube body 11 away from the needle head 12 passes through the catheter assembly 20 and is then inserted into the needle seat 30 and fixed. It should be understood that the provision of the rounded structure can blunt the end of the needle tube and prevent the needle tube from damaging the buttonhole tunnel and blood vessels.

[0035] Furthermore, a plurality of reinforcing ribs 102 are provided in the puncture needle tube 10 to enhance the overall rigidity of the puncture needle tube 10 and prevent the puncture needle tube 10 from bending and deforming when entering the buttonhole tunnel for puncture, thereby affecting the performance of the puncture needle tube 10. In this embodiment, each reinforcing rib 102 is arranged axially along the puncture needle tube 10, and a plurality of reinforcing ribs 102 are evenly spaced along the circumference of the puncture needle tube 10. Specifically, the cross-section of the reinforcing rib 102 is semicircular, and in the circumference of the puncture needle tube 10, both sides of the reinforcing rib 102 are smoothly connected to the inner wall of the puncture needle tube 10. It should be noted that the structural design of the reinforcing rib 102 in the present invention is not limited to the structure in the above embodiment, and can also be other structural designs that can achieve the purpose of the present invention.

[0036] By way of example, the catheter assembly 20 includes a catheter 21, a catheter adapter 22 connected to one end of the catheter 21, a flexible tube 23 connected to the catheter adapter 22, and a flexible tube adapter 24 connected to the flexible tube 23. The catheter 21, the catheter adapter 22, the flexible tube 23, and the flexible tube adapter 24 are sequentially connected to form a passage 201 for the puncture needle 10 to pass through. Specifically, in this embodiment, the inner diameter of the passage 201 formed by the catheter 21, the catheter adapter 22, the flexible tube 23, and the flexible tube adapter 24 is larger than the diameter of the puncture needle 10, and the total length of the catheter 21, the catheter adapter 22, the flexible tube 23, and the flexible tube adapter 24 is smaller than the total length of the puncture needle 10. When the body 11 of the puncture needle 10 passes through the catheter 21 and sequentially passes through the catheter adapter 22, the flexible tube 23, and the flexible tube adapter 24 along the passage 201, the end of the body 11 away from the needle end is located outside the flexible tube adapter 24.

[0037] Furthermore, in this embodiment, the catheter 21 is a transparent tube arrangement, which includes a connecting tube portion, a first limiting tube portion connected to one end of the connecting tube portion, and a second limiting tube portion connected to the other end of the connecting tube portion, wherein the inner diameter of the first limiting tube portion is larger than the inner diameter of the connecting tube portion, and the catheter seat 22 is provided with a limiting through hole adapted to the first limiting tube portion, so that one end of the catheter 21 can be limited and fixed in the catheter seat 22, and the inner diameter of the second limiting tube portion gradually decreases from the connection between the second limiting tube portion and the connecting tube portion toward the direction away from the connecting tube portion, and the inner diameter of the through hole at the end of the second limiting tube portion is adapted to the diameter of the puncture needle tube 10, so that the puncture needle tube 10 can smoothly pass through the catheter 21, and the second limiting tube portion is used to limit the shaking that may occur in the area where the needle head 12 in the puncture needle tube 10 is located.

[0038] A connecting portion 241 is provided on the outer wall of the end of the hose holder 24 away from the hose 23. A mounting groove 301 is provided at one end of the needle holder 30. The connecting portion 241 fits in the mounting groove 301. During assembly, the connecting portion 241 engages with the groove wall of the mounting groove 301 to securely connect the hose holder 24 and the needle holder 30. Furthermore, a fixing hole 302 is provided in the needle holder 30, communicating with the mounting groove 301. This fixing hole 302 fits in with the puncture needle tube 10. After the tube body 11 of the puncture needle tube 10 passes through the catheter 21 and into the needle holder 30 along the passage 201, the tube body 11 is fixed to the fixing hole 302 of the needle holder 30 by adhesive bonding.

[0039] Furthermore, in this embodiment, at least one side hole 103 is provided at the end of the tube body 11 connected to the needle head 12, and the end of the tube body 11 fixed in the needle holder 30, i.e., the tail end of the tube body 11, is a closed end. The provision of the side hole 103 facilitates observation of blood return and can serve as a basis for determining whether the puncture needle tube 10 has entered a blood vessel. The design of the tail end of the tube body 11 as a closed end can prevent blood leakage. In actual use, when the dialysis indwelling needle of the present invention is used for puncture, blood flows along the inner wall of the puncture needle tube 10 and then flows into the catheter assembly 20 through the side hole 103 on the puncture needle tube 10. The design of the catheter 21 as a transparent tube facilitates the operator to observe the blood return.

[0040] In summary, the beneficial effects of the dialysis indwelling needle of the present invention are: the needle head and the beveled surface are connected by a rounded structure to reduce the sharpness of the needle tip, so that the dialysis indwelling needle in this application can be used for buttonhole puncture, enriching the puncture application scenarios; specifically, the puncture needle tube includes a tube body and a needle head integrally connected to the tube body, the needle head is provided with a beveled surface, the beveled surface is inclined from the end of the needle head away from the tube body toward the tube body, and the connection between the needle head and the beveled surface is a rounded structure; further, the puncture needle tube is made of polymer plastic, which has less irritation to the patient's blood vessel wall during use, can avoid damage to the inner wall of the blood vessel, reduce the incidence of blood vessel swelling and bleeding, and can extend the service life of the patient's arteriovenous fistula. Compared with steel needles, it has better biocompatibility and a lower incidence of allergies in patients.

[0041] Example 2

[0042] See also Figure 7 , shown is a dialysis indwelling needle in the second embodiment of the present invention. The difference between the dialysis indwelling needle in this embodiment and the dialysis indwelling needle in the first embodiment is that the puncture needle tube 10 is a solid tube structure.

[0043] Example 3

[0044] See also Figure 8, shown is a dialysis indwelling needle in the third embodiment of the present invention. The difference between the dialysis indwelling needle in this embodiment and the dialysis indwelling needle in the first embodiment is that the puncture needle tube 10 is a hollow tube structure, and the inner wall of the puncture needle tube is smoothly arranged.

[0045] Example 4

[0046] See also Figure 9 , shown is a dialysis catheter in a fourth embodiment of the present invention. The dialysis catheter in this embodiment differs from the dialysis catheter in the first embodiment in that the body portion 11 of the puncture needle tube 10 in this embodiment is not provided with a side hole, and the dialysis catheter in this embodiment also includes a blood return device 40. One end of the blood return device 40 is connected to the needle seat 30, and the other end of the blood return device 40 is provided with a breathable membrane 41. Specifically, the breathable membrane 41 is ultrasonically welded to the interior of the blood return device 40, and the end of the body portion 11 fixed to the needle seat 30 is connected to the interior of the blood return device 40. In actual use, when the dialysis catheter in this embodiment is punctured, blood flows along the inner wall of the puncture needle tube 10 to the blood return device 40. The design of the breathable membrane 41 in the blood return device 40 can block blood, thereby effectively preventing bleeding.

[0047] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0048] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A dialysis indwelling needle, characterized in that: It includes a puncture needle tube, a catheter assembly and a needle seat adapted to the catheter assembly, wherein the puncture needle tube is made of polymer plastic; The puncture needle tube includes a tube body and a needle head integrally connected to the tube body, the needle head is provided with an oblique cut surface, the oblique cut surface is inclined from the end of the needle head away from the tube body toward the tube body, the connection between the needle head and the oblique cut surface is a rounded structure, the end of the tube body away from the needle head passes through the catheter assembly and then penetrates into and is fixed in the needle seat; A plurality of reinforcing ribs are further provided in the puncture needle tube, each of the reinforcing ribs is arranged along the axial direction of the puncture needle tube, and a plurality of the reinforcing ribs are evenly spaced along the circumference of the puncture needle tube.

2. The dialysis indwelling needle according to claim 1, characterized in that: The catheter assembly includes a catheter, a catheter seat connected to one end of the catheter, a hose connected to the catheter seat, and a hose seat connected to the hose. The catheter, the catheter seat, the hose, and the hose seat are sequentially connected to form a channel for the puncture needle tube to pass through. After the end of the tube body away from the needle head penetrates from the catheter, it penetrates into the needle seat along the channel and is fixed in the needle seat by bonding.

3. The dialysis indwelling needle according to claim 1, characterized in that: One end of the tube body connected to the needle head is provided with at least one side hole, and the end of the tube body fixed in the needle seat is a closed end.

4. The dialysis indwelling needle according to claim 1, characterized in that The dialysis indwelling needle also includes a blood returner, one end of which is connected to the needle seat, and the other end of which is provided with a breathable membrane. The end of the tube body fixed in the needle seat is connected to the interior of the blood returner.

5. The dialysis indwelling needle according to claim 1, characterized in that: The angle between the oblique cutting surface and the axial direction of the puncture needle tube is 20°-25°.

6. The dialysis indwelling needle according to claim 1, characterized in that: The puncture needle tube is a solid tube structure.

7. The dialysis indwelling needle according to claim 1, characterized in that: The puncture needle tube is a hollow tube structure.

8. The dialysis indwelling needle according to claim 2, characterized in that: A connecting portion is provided on the outer wall of one end of the hose seat away from the hose, and a mounting groove is provided at one end of the needle seat, and the mounting groove is adapted to the connecting portion.

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