A hemodialysis arteriovenous indwelling needle

Abstract

The application relates to the technical field of indwelling needle, in particular to a blood dialysis arteriovenous indwelling needle which comprises an outer needle assembly and an inner needle assembly, the outer needle assembly comprises a sleeve and a sleeve connected with the sleeve, the inner needle assembly comprises a steel needle and a needle seat connected with the steel needle, the sleeve is configured to pass through the steel needle, and the sleeve is configured to be connected with the needle seat in a gap mode; the steel needle is further provided with a protective sleeve which is arranged in a relatively slidable mode, the protective sleeve is in a one-side opening structure arranged towards a needle tip, the protective sleeve comprises a hollow protective tube and a base arranged at one end of the protective tube, and the base is provided with a through hole; wherein the front end of the steel needle is provided with a deformation part, the maximum distance of the deformation part in the radial direction of the steel needle is greater than the inner diameter of the through hole, so that when the inner needle assembly is pulled out of the outer needle assembly, the protective sleeve is clamped at the front end of the steel needle and covers the needle tip of the steel needle. Through the above arrangement, the protection of the needle tip is realized, the structure of the protective sleeve is simple, the production and manufacturing are facilitated, and the cost of the safe indwelling needle is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of indwelling needle, in particular to a hemodialysis arteriovenous indwelling needle. BACKGROUND

[0002] Hemodialysis is the main treatment method for end-stage renal patients to maintain life, and patients need to undergo hemodialysis two to three times a week. When hemodialysis is performed, two thick steel needles are inserted into the arteriovenous of the patient to establish a hemodialysis channel, and then connected with a hemodialysis instrument to realize hemodialysis. In order to reduce the pain of patients, the existing technology adopts the method of indwelling needle, that is, the needle tube is pre-stored on the patient's body to reduce the number of needle pricking of the patient.

[0003] However, after the indwelling needle is pricked, the inner needle needs to be taken out of the indwelling needle. During the process of taking out the inner needle, there is a possibility that the medical staff will be pricked and even infected by mistake. In order to protect the medical staff, some safety indwelling needles are disclosed in the related art, which mainly cover the front end of the inner needle by the spring type needle tip protection mechanism through the action of the spring when the inner needle is pulled out, or realize the protection of the needle tip by the sliding type sleeve extension, or realize the protection of the needle tip by the magnetic attraction structure.

[0004] However, the inventors found that the structure of the above-mentioned safety indwelling needle is relatively complex, and the manufacturing difficulty is large and the cost is high. SUMMARY

[0005] In view of at least one of the above technical problems, the present application provides a hemodialysis arteriovenous indwelling needle which improves the structure to reduce the protection cost of the inner needle of the indwelling needle.

[0006] According to a first aspect of the present application, a hemodialysis arteriovenous indwelling needle is provided, comprising an outer needle assembly and an inner needle assembly, the outer needle assembly comprising a sleeve and a sleeve connected with the sleeve, the inner needle assembly comprising a steel needle and a needle seat connected with the steel needle, the sleeve being configured to pass through the steel needle, and the sleeve being configured to be connected with the needle seat in a gap.

[0007] The steel needle further has a protection sleeve which is arranged to be relatively slidable, the protection sleeve has a one-sided opening structure arranged towards the needle tip, the protection sleeve comprises a hollow protection tube and a base arranged at one end of the protection tube, and the base has a through hole;

[0008] The front end of the steel needle has a deformation part, the maximum distance of the deformation part in the radial direction of the steel needle is greater than the inner diameter of the through hole, so that when the inner needle assembly is pulled out of the outer needle assembly, the protection sleeve is clamped at the front end of the steel needle and covers the needle tip of the steel needle.

[0009] In some embodiments of the present application, the front end of the sleeve is in a conical structure.

[0010] In some embodiments of the present application, the front end of the sleeve has a side hole in communication with the interior.

[0011] In some embodiments of the present application, the sleeve is in a hard structure, and the bottom of the sleeve has a connecting part for connecting with a dialysis instrument.

[0012] In some embodiments of the present application, the side wall of the sleeve is further provided with reinforcing ribs in a circumferential direction.

[0013] In some embodiments of the present application, the outer needle assembly further comprises a reinforcing sleeve and a connecting hose connected with the reinforcing sleeve, the reinforcing sleeve is connected with the sleeve, and the connecting hose is connected with the sleeve.

[0014] In some embodiments of the present application, the outer needle assembly is in a transparent material.

[0015] In some embodiments of the present application, the protective sleeve is configured to be relatively slidably arranged inside the sleeve, and a separation plug is further arranged on the steel needle between the protective sleeve and the needle seat, and the separation plug is in sealing contact with the steel needle and the inner wall of the sleeve.

[0016] In some embodiments of the present application, the needle seat further has a water-blocking and air-permeable film.

[0017] In some embodiments of the present application, the water-blocking and air-permeable film is fixed in the needle seat in a manner of welding or clearance fit connection.

[0018] The present application has the following beneficial effects: by arranging the protective sleeve on the steel needle and by arranging the deformed part at the front end of the steel needle, when the inner needle assembly is pulled out of the outer needle assembly, the protective sleeve is clamped at the position of the deformed part at the front end of the steel needle, and the protective sleeve covers the front end of the steel needle, thereby achieving protection of the needle tip of the steel needle. Compared with the prior art, the structure of the protective sleeve is simple, and it is convenient for production and manufacturing, thereby reducing the cost of the safety indwelling needle. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Figure 1It is an exploded structural schematic view of the hemodialysis arteriovenous indwelling needle in the embodiment of the present application;

[0021] Figure 2 It is a partial enlarged view of A in Figure 1

[0022] Figure 3 It is a sectional structural schematic view of the steel needle and the protective sleeve in the embodiment of the present application;

[0023] Figure 4 It is a structural schematic view of the outer needle assembly in the embodiment of the present application;

[0024] Figure 5 It is a whole sectional view of the hemodialysis arteriovenous indwelling needle in the embodiment of the present application;

[0025] Figure 6 It is a partial enlarged view of B in Figure 5

[0026] Figure 7 It is a step schematic view when the hemodialysis indwelling needle is extracted in the embodiment of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0028] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being “connected” to another element, it can be directly connected to the other element or intervening elements can be present. The terms “vertical”, “horizontal”, “left”, “right” and similar expressions as used herein are for illustrative purposes only and are not intended to be limiting.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0030] As shown in Figures 1 to 7 ​​The hemodialysis arteriovenous indwelling needle shown includes an outer needle assembly 1 and an inner needle assembly 2, the outer needle assembly 1 includes a sleeve 11 and a sleeve 12 connected with the sleeve 11, the inner needle assembly 2 includes a steel needle 21 and a needle seat 22 connected with the steel needle 21, the sleeve 11 is configured to pass through the steel needle 21, and the sleeve 12 is configured to be connected with the needle seat 22 in a gap fit; it should be pointed out here that in some embodiments of the present application, the outer diameter of the steel needle 21 is slightly smaller than the inner diameter of the sleeve 12, on the one hand, it is convenient for the steel needle 21 to be extracted, and on the other hand, it is convenient for the sleeve 11 to enter into the blood vessel together with the steel needle 21.

[0031] The steel needle 21 also has a protective sleeve 3 which is arranged to be relatively slidable, the protective sleeve 3 is a one-side opening structure arranged towards the needle tip, the protective sleeve 3 includes a hollow protective tube 31 and a base 32 arranged at one end of the protective tube 31, and the base 32 has a through hole 32a; it should be pointed out here that in the embodiment of the present application, the protective sleeve 3 is configured to be arranged inside the sleeve 12, so that the protective sleeve 3 is not in contact with the outside world before use, which can prevent the protective sleeve 3 from being contaminated and improve its cleanliness, on the other hand, it can also reduce the volume of the indwelling needle as a whole and improve the space utilization rate;

[0032] Among them, the front end of the steel needle 21 has a deformation part 21a, the maximum distance of the deformation part 21a in the radial direction of the steel needle 21 is greater than the inner diameter of the through hole 32a, so that when the inner needle assembly 2 is extracted from the outer needle assembly 1, the protective sleeve 3 is clamped at the front end of the steel needle 21 and covers the needle tip of the steel needle 21.

[0033] In specific use, please refer to Figure 7 , first, the inner needle assembly 2 is arranged in the outer needle assembly 1 and is inserted into the blood vessel of the patient together, then the inner needle assembly 2 is extracted, the protective sleeve 3 is slid forward under the action of external force when extracted, and finally stops at the front end of the steel needle 21, the temporary fixation of the protective sleeve 3 is realized through the cooperation of the deformation part 21a and the through hole 32a of the protective sleeve 3, so as to realize the effect shown in Figure 1 , the protective sleeve 3 covers the tip position of the steel needle 21, preventing the medical staff from being injured by mistake during operation.

[0034] In the above embodiment, by arranging the protective sleeve 3 on the steel needle 21 and arranging the deformation part 21a at the front end of the steel needle 21, when the inner needle assembly 2 is extracted from the outer needle assembly 1, the protective sleeve 3 is clamped at the deformation part 21a position at the front end of the steel needle 21, and the protective sleeve 3 covers the front end of the steel needle 21, so as to realize the protection of the needle tip of the steel needle 21, compared with the prior art, the structure of the protective sleeve 3 is simple, which is convenient for production and manufacturing, and further reduces the cost of the safety indwelling needle.

[0035] On the basis of the above embodiment, in the embodiment of the present application, as shown in Figure 4As shown in the figure, in order to further reduce the resistance of the sleeve 11 following the steel needle 21 into the skin, the front end of the sleeve 11 is in a tapered structure. In order to further improve the convenience of the needle, in some embodiments of the present application, the inclination angle of the tapered structure can be similar to the inclination of the needle tip of the steel needle 21.

[0036] Please continue to refer to Figure 4 In some embodiments of the present application, the front end of the sleeve 11 has a side hole 11a in communication with the inside. It should be pointed out here that the front end of the sleeve 11 refers to the vicinity of the tapered structure, which can be provided on the tapered structure, or separately or simultaneously provided on the sleeve 11 body near the tapered structure. By providing the side hole 11a, the area of blood entering the inside of the sleeve 11 can be increased, the occurrence of blockage can be reduced, and the diffusion rate of the drug can also be improved.

[0037] In some embodiments of the present application, the sleeve 12 is a hard structure, and the bottom of the sleeve 12 has a connecting part 12a for connecting with the dialysis instrument. It should be pointed out here that the hard structure here is a conventional existing material, such as plastic, etc.; the connecting part 12a has various forms in the embodiments of the present application, which can be, for example Figure 4 The buckle structure shown in the figure, or an external thread can be provided on the sleeve 12, which is connected with the dialysis instrument by means of threaded connection. At the same time, in the embodiments of the present application, the sleeve 12 is used as a holding part of the plug-in inner needle, which improves the convenience and reliability of operation by being provided as a hard material.

[0038] In order to further improve the reliability of operation, for example, when the inner needle assembly 2 is extracted or connected with the dialysis instrument, in order to ensure the reliability of holding, in some embodiments of the present application, as shown in Figure 4 The side wall of the sleeve 12 is also provided with reinforcing ribs 12b uniformly distributed in the circumferential direction. The reinforcing ribs 12b here can be strip-shaped protruding structures provided on the outer wall of the sleeve 12.

[0039] Please continue to refer to Figure 4 In the embodiments of the present application, in order to reduce the loss of blood in the outer needle assembly 1 when the inner needle is extracted, the outer needle assembly 1 further comprises a reinforcing sleeve and a connecting hose connected with the reinforcing sleeve, the reinforcing sleeve is connected with the sleeve 11, and the connecting hose is connected with the sleeve 12. By providing the connecting hose, the blood flow passage of the outer needle assembly 1 can be temporarily closed by deforming the connecting hose, for example, by folding or clamping with a clamp to block the blood flow, and after the sleeve 12 is connected with the dialysis instrument, the connecting hose is restored to its original state.

[0040] In the embodiments of the present application, in order to facilitate the observation of the blood return after the needle, the outer needle assembly 1 is made of transparent material. Similarly, in the embodiments of the present application, in order to facilitate the observation during the needle, the needle seat 22 can also be made of transparent material.

[0041] In the embodiment of the present application, in order to prevent blood from leaking out of the inner needle assembly 2 and the outer needle assembly 1, a separation plug 4 is also provided as shown in Figure 6 The protective sleeve 3 is configured to be arranged in the sleeve 12 in a relatively slidable manner, the steel needle 21 is sleeved with the separation plug 4 between the protective sleeve 3 and the needle seat 22, and the separation plug 4 is in sealing contact with the steel needle 21 and the inner wall of the sleeve 12. In the embodiment of the present application, by arranging the separation plug 4, not only the sealing performance between the outer needle assembly 1 and the inner needle assembly 2 is improved, but also the separation plug 4 can serve as an external force to move the protective sleeve 3 towards the needle tip when the steel needle 21 is withdrawn, thereby further simplifying the operation difficulty. In addition, it should be pointed out here that in the embodiment of the present application, the protective sleeve 3 is installed by first penetrating from the bottom of the steel needle 21, then penetrating the separation plug 4, and finally fixedly connecting the steel needle 21 and the needle seat 22; of course, the separation plug 4 can also be provided with a mounting slot in the radial direction, and the steel needle 21 is directly sleeved on the steel needle 21 from the side of the steel needle 21 after the steel needle 21 and the needle seat 22 are fixed.

[0042] In some embodiments of the present application, in order to reduce the air mixed in the outer needle assembly 1 during hemodialysis, the needle seat 22 also has a water-blocking and air-permeable film 5 in the embodiment of the present application. The water-blocking and air-permeable film 5 has the characteristics of allowing air to pass through and blocking blood flow, and is provided with small-diameter holes through which blood cannot pass. After the inner needle penetrates into the inside of the blood vessel, the blood pressure will press the blood into the inner needle assembly 2 under the action of the blood pressure, thereby expelling the air. When the inner needle assembly 2 is withdrawn, the air in the outer needle assembly 1 is also taken away. In this way, the reliability when connected to the dialysis instrument is improved.

[0043] In some embodiments of the present application, as to the connection mode of the water-blocking and air-permeable film 5 in the needle seat 22, the water-blocking and air-permeable film 5 can be fixed in the needle seat 22 by welding, or as shown in Figure 5 , the water-blocking and air-permeable film 5 is fixed at the front end of a wedge-shaped cap, and the wedge-shaped cap is fixed in the needle seat 22 by gap fitting. Those skilled in the art can select the specific fixing mode according to the needs.

[0044] Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A hemodialysis arteriovenous indwelling needle, characterized by, The outer needle assembly comprises a sleeve and a sleeve connected with the sleeve, and the inner needle assembly comprises a steel needle and a needle seat connected with the steel needle, the sleeve is configured to pass through the steel needle, and the sleeve is configured to be connected with the needle seat in a clearance fit; The steel needle also has a protective sleeve that can be relatively slidably arranged, the protective sleeve has a one-sided opening structure arranged towards the needle tip, the protective sleeve comprises a hollow protective tube and a base arranged at one end of the protective tube, and the base has a through hole; The front end of the steel needle has a deformation part, the maximum distance of the deformation part in the radial direction of the steel needle is greater than the inner diameter of the through hole, so that when the inner needle assembly is pulled out of the outer needle assembly, the protective sleeve is clamped at the front end of the steel needle and covers the needle tip of the steel needle; The protective sleeve is configured to be relatively slidably arranged inside the sleeve, and a separation plug is further sleeved on the steel needle between the protective sleeve and the needle seat, the separation plug is in sealing contact with the steel needle and the inner wall of the sleeve, and the separation plug provides an external force for moving the protective sleeve to the needle tip when the steel needle is pulled out; The needle seat also has a water-blocking and air-permeable film, which, after the steel needle penetrates into the blood vessel, under the action of blood pressure, presses the blood into the inner needle assembly, and at the same time when the steel needle is pulled out, also carries away the air inside the outer needle assembly; The front end of the sleeve has a tapered structure, and the front end of the sleeve has a side hole in communication with the inside, and the outer needle assembly is made of transparent material; The sleeve is a hard structure, and the bottom of the sleeve has a connecting part for connecting with a dialysis instrument; The water-blocking and air-permeable film is fixed in the needle seat in a welding or clearance fit connection manner.

2. The hemodialysis A-V indwelling needle according to claim 1, wherein The side wall of the sleeve is also uniformly provided with reinforcing ribs in the circumferential direction.

3. The hemodialysis A-V indwelling needle according to claim 1, wherein The outer needle assembly further comprises a reinforcing sleeve and a connecting hose connected with the reinforcing sleeve, the reinforcing sleeve is connected with the sleeve, and the connecting hose is connected with the sleeve.

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