Retractable arteriovenous fistula puncture needle

Abstract

The utility model discloses a retraction type arteriovenous fistula puncture needle, which relates to the technical field of medical clinic, and comprises a first catheter, a second catheter and a needle tube seat, the top end of the needle tube seat is connected with a puncture needle body, the needle tube body is movably arranged on the outer side of the puncture needle body, and the needle tube body adopts a remaining needle plastic soft needle head. Through the arrangement of the needle tube body, after the puncture needle body carries the needle tube body to be inserted into the blood vessel of a patient, the sliding plate is pulled to slide downwards in the limiting groove formed in the first catheter, so that the puncture needle body is pulled out of the blood vessel of the patient to be stored in the first catheter and the second catheter; the needle tube body is reserved in the blood vessel of a patient, the safety of the arteriovenous fistula puncture needle in the medical process is achieved, the needle tube body adopts the soft needle head of the indwelling needle, the phenomenon that the blood vessel is punctured by moving the arm of the patient in the dialysis process can be avoided when blood filtration is conducted on the dialysis patient, and the comfort of the patient in the dialysis process is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of clinical instruments, in particular to a retractable arteriovenous fistula puncture needle. Background Art

[0002] Dialysis is a medical procedure that helps the body eliminate waste and excess fluid. Dialysis is needed when the kidneys cannot complete these tasks effectively, such as in cases of kidney failure. Hemodialysis is a process that removes waste and excess fluid from the blood through a machine. This process usually needs to be performed three times a week, each time for about three to five hours. During the dialysis process, the patient's blood will pass through a filter that is equivalent to an artificial kidney. This filter can remove excess fluid, chemicals and waste from the blood. The purified blood will be pumped back into the body. In the clinical hemodialysis room, an arteriovenous fistula puncture needle is required.

[0003] Currently, most of the arteriovenous puncture needles used clinically are disposable steel needles. After puncture, the steel needle remains in the blood vessel to perform hemodialysis for the patient. The hemodialysis time is generally 4 hours. After puncture, the puncture needle remains in the patient's upper arm, which can easily lead to restricted patient movement during the hemodialysis process. If the patient moves his upper arm during the hemodialysis process, it is easy to cause bleeding or subcutaneous hematoma, which can easily cause discomfort to the patient.

[0004] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a retractable arteriovenous fistula puncture needle is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a retractable arteriovenous fistula puncture needle to solve the problem proposed in the above-mentioned background technology that most of the arteriovenous puncture needles used clinically are disposable steel needles. After puncture, the steel needle remains in the blood vessel to perform hemodialysis on the patient. The hemodialysis time is generally 4 hours. After puncture, the puncture needle remains in the patient's upper arm, which may easily lead to limited patient activities during the hemodialysis process. If the patient moves his upper arm during the hemodialysis process, it may easily cause bleeding or subcutaneous hematoma, which may easily cause discomfort to the patient.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a retractable arteriovenous fistula puncture needle, comprising a No. 1 catheter, a No. 2 catheter and a needle tube seat, the needle tube seat being movably located inside the No. 1 catheter and the No. 2 catheter, the top of the needle tube seat being connected to a puncture needle body, the outer diameter of the puncture needle body being 1 mm, and the length of the puncture needle body being 28 mm, a needle tube body being movably arranged on the outside of the puncture needle body, and the needle tube body adopts a plastic soft needle head of an indwelling needle, the outer diameter of the needle tube body being 1.6 mm, and the length of the needle tube body being 25 mm, a plurality of groups of No. 2 rubber rings being arranged on the outside of the needle tube seat, and the No. 2 rubber rings being in contact with the inner wall of the No. 1 catheter, a guide hole being opened inside the needle tube seat, and the guide hole being connected with the inside of the needle tube body, and the guide hole being a circular arc hole, a connecting plate being connected to one side of the needle tube seat, and a sliding plate being connected to one side of the connecting plate.

[0007] Furthermore, the No. 2 catheter is detachably connected and installed on the top of the No. 1 catheter, and the No. 2 catheter and the No. 1 catheter are threadedly connected. A connecting tube is connected to the top of the No. 2 catheter, and the connecting tube is connected to the bottom of the needle body.

[0008] Furthermore, a long conduit connection seat is connected to the interior of one side of the No. 2 conduit, and the long conduit connection seat can be connected to the interior of the guide hole, and the other end of the long conduit connection seat is connected to a connecting hose.

[0009] Furthermore, the outer movable assembly of the needle tube body is connected with a protective tube, the inner wall of the protective tube is provided with a No. 1 rubber ring, and the No. 1 rubber ring is in contact with the outer side of the needle tube body.

[0010] Furthermore, a limiting groove is formed through the outer side of the No. 1 conduit, and the limiting groove is located on the outer side of the connecting plate.

[0011] Furthermore, the first rubber ring and the second rubber ring are both made of flexible rubber material.

[0012] Furthermore, the top end of the needle tube seat is conical, and the needle tube seat can be engaged, assembled and movably connected with the top inner wall of the connecting tube.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model adopts the arrangement of the needle tube body. After the puncture needle body carries the needle tube body and is inserted into the patient's blood vessel, the sliding plate is pulled to slide downward in the limiting groove provided in the No. 1 catheter, so that the puncture needle body is drawn out of the patient's blood vessel and stored in the No. 1 catheter and the No. 2 catheter, so that the needle tube body remains in the patient's blood vessel, thereby achieving the safety of the arteriovenous fistula puncture needle in the medical process. By adopting the soft needle of the indwelling needle in the needle tube body, the patient can avoid moving his arm and puncturing the blood vessel during the dialysis process when undergoing blood filtration, thereby effectively improving the patient's comfort during the dialysis process.

[0015] 2. The utility model sets a limit groove, utilizes the No. 1 rubber ring on the inner wall of the protective tube to squeeze and contact with the outer side of the needle tube body, and utilizes the protective tube to protect the needle tube body and the puncture needle body. The limit groove can limit the auxiliary connecting plate to move up and down. The length of the limit groove can ensure that the puncture needle body retracts into the interior of the No. 2 catheter and the No. 1 catheter, and ensures the stability of the needle tube seat moving inside the No. 2 catheter and the No. 1 catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the device body;

[0017] Figure 2 It is a schematic diagram of the cross-section structure of the No. 1 catheter of the device body;

[0018] Figure 3 It is a schematic diagram of the cross-section structure of the No. 2 catheter of the main body of the device;

[0019] Figure 4 It is a schematic diagram of the connecting seat structure of the device body.

[0020] In the figure: 1. No. 1 catheter; 2. No. 2 catheter; 3. Long catheter connecting seat; 4. Connecting hose; 5. Connecting tube; 6. Protective tube; 7. No. 1 rubber ring; 8. Limiting groove; 9. Needle tube seat; 10. Needle tube body; 11. No. 2 rubber ring; 12. Guide hole; 13. Connecting plate; 14. Sliding plate; 15. Puncture needle body. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Embodiment 1

[0023] like Figure 1 - Figure 4As shown, the retractable arteriovenous fistula puncture needle comprises a No. 1 catheter 1, a No. 2 catheter 2 and a needle tube seat 9, wherein the needle tube seat 9 is movably located inside the No. 1 catheter 1 and the No. 2 catheter 2, and the top of the needle tube seat 9 is connected to a puncture needle body 15, wherein the outer diameter of the puncture needle body 15 is 1 mm, and the length of the puncture needle body 15 is 28 mm, and a needle tube body 10 is movably arranged on the outer side of the puncture needle body 15, and the needle tube body 10 adopts a plastic soft needle head of an indwelling needle, and the outer diameter of the needle tube body 10 is 1.6 mm, and the needle tube body 1 0 has a length of 25mm, multiple groups of No. 2 rubber rings 11 are arranged on the outside of the needle tube seat 9, and the No. 2 rubber rings 11 are in contact with the inner wall of the No. 1 catheter 1, a guide hole 12 is opened inside the needle tube seat 9, and the guide hole 12 is connected to the inside of the needle tube body 10, and the guide hole 12 is an arc hole, a connecting plate 13 is connected to one side of the needle tube seat 9, and a sliding plate 14 is connected to one side of the connecting plate 13, the top of the needle tube seat 9 is conical, and the needle tube seat 9 can be engaged with the top inner wall of the connecting tube 5 and movably connected.

[0024] Furthermore, the needle tube seat 9 is movably located inside the No. 1 catheter 1. By utilizing the rubber characteristics of the No. 2 rubber ring 11, the No. 2 rubber ring 11 is squeezed and contacted with the inner wall of the No. 1 catheter 1, so that the needle tube seat 9 can be positioned in the use position inside the No. 1 catheter 1 and the No. 2 catheter 2. The connecting plate 13 plays a connecting role. The connecting plate 13 is used to connect the outer side of the needle tube seat 9 and the sliding plate 14. Through the connecting function of the connecting plate 13, the sliding plate 14 can be located on the outer side of the No. 1 catheter 1. The puncture needle body 15 is a technology in the existing mature technical field.

[0025] Furthermore, by applying an upward pushing force to the sliding plate 14, the connecting plate 13 can push the needle tube seat 9 to move upward from the No. 1 catheter 1 to the inside of the No. 2 catheter 2, so that the needle tube seat 9 is engaged and connected with the top inner wall of the connecting tube 5. At this time, the guide hole 12 opened inside the needle tube seat 9 is located on one side of the long catheter connecting seat 3, and the guide hole 12 and the long catheter connecting seat 3 are in an internal through-state. The needle tube seat 9 can slide inside the No. 1 catheter 1 and the No. 2 catheter 2, and the puncture needle body 15 can be used to store inside the No. 1 catheter 1 and the No. 2 catheter 2. The puncture needle body 15 can be used to pierce the patient's skin, and the puncture needle body 15 is inserted into the patient's blood vessel with the needle tube body 10 movably arranged outside;

[0026] Furthermore, in the same way, after the puncture needle body 15 carrying the needle tube body 10 is inserted into the patient's blood vessel, the operation is reversed, and the sliding plate 14 is pulled downward in the limiting groove 8 opened in the No. 1 catheter 1, so that the puncture needle body 15 is drawn out of the patient's blood vessel and stored in the No. 1 catheter 1 and the No. 2 catheter 2, so that the needle tube body 10 remains in the patient's blood vessel, and the multiple groups of No. 2 rubber rings 11 arranged on the outside of the needle tube seat 9 are squeezed and contacted with the inner wall of the No. 2 catheter 2. At this time, a cavity can be formed inside the No. 2 catheter 2 and the connecting tube 5, and the blood inside the needle tube body 10 can flow to the inside of the connecting hose 4 through the long catheter connecting seat 3, thereby realizing the safety of the arteriovenous fistula puncture needle in the medical process. By using the soft needle tip of the indwelling needle in the needle tube body 10, when the dialysis patient undergoes blood filtration, it can be avoided that the patient moves his arm during the dialysis process to puncture the blood vessel, thereby effectively improving the patient's comfort during the dialysis process.

[0027] Embodiment 2

[0028] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the retractable arteriovenous fistula puncture needle proposed by the utility model is another embodiment of the utility model compared to Example 1. The No. 2 catheter 2 is detachably connected and installed on the top end of the No. 1 catheter 1, and the No. 2 catheter 2 is threadedly connected to the No. 1 catheter 1. The top of the No. 2 catheter 2 is internally connected with a connecting tube 5, and the connecting tube 5 is connected to the bottom end of the needle tube body 10. A long catheter connecting seat 3 is internally connected to one side of the No. 2 catheter 2, and the long catheter connecting seat 3 can be connected to the inside of the guide hole 12. The other end of the long catheter connecting seat 3 is connected to a connecting hose 4. The outer side of the needle tube body 10 is movably combined with a protective tube 6. The inner wall of the protective tube 6 is provided with a No. 1 rubber ring 7, and the No. 1 rubber ring 7 is in contact with the outer side of the needle tube body 10. The outer side of the No. 1 catheter 1 is penetrated by a limiting groove 8, and the limiting groove 8 is located on the outer side of the connecting plate 13. The No. 1 rubber ring 7 and the No. 2 rubber ring 11 are both made of flexible rubber material.

[0029] Furthermore, the inner diameters of the No. 2 catheter 2 and the No. 1 catheter 1 are the same. The No. 2 catheter 2 is detachably connected to the No. 1 catheter 1 through a thread, which facilitates the disassembly and assembly of the needle tube seat 9. The No. 2 catheter 2 is internally connected to the long catheter connecting seat 3 through the connecting hose 4, and external liquid can enter the interior of the long catheter connecting seat 3 through the connecting hose 4.

[0030] Furthermore, by using the No. 1 rubber ring 7 on the inner wall of the protective tube 6 to squeeze and contact the outer side of the needle tube body 10, the protective tube 6 can be movably assembled outside the needle tube body 10, and the protective tube 6 can be used to protect the needle tube body 10 and the puncture needle body 15.

[0031] Furthermore, the limiting groove 8 is provided on the outer side of the No. 1 catheter 1, and then the connecting plate 13 is movable through the inside of the limiting groove 8. The limiting groove 8 can limit the auxiliary connecting plate 13 to move up and down. The opening length of the limiting groove 8 can ensure that the puncture needle body 15 is retracted into the inside of the No. 2 catheter 2 and the No. 1 catheter 1.

[0032] Working principle: when in use, after the puncture needle body 15 carries the needle tube body 10 and is inserted into the patient's blood vessel, the operation is reversed, and the sliding plate 14 is pulled downward in the limiting groove 8 opened in the No. 1 catheter 1, so that the puncture needle body 15 is drawn out of the patient's blood vessel and stored in the No. 1 catheter 1 and the No. 2 catheter 2, so that the needle tube body 10 remains in the patient's blood vessel, and the multiple groups of No. 2 rubber rings 11 arranged on the outside of the needle tube seat 9 are squeezed and contacted with the inner wall of the No. 2 catheter 2. At this time, a cavity can be formed inside the No. 2 catheter 2 and the connecting tube 5, and the blood inside the needle tube body 10 can flow to the inside of the connecting hose 4 through the long catheter connecting seat 3, thereby realizing the safety of the arteriovenous fistula puncture needle in the medical process. By using the soft needle of the indwelling needle in the needle tube body 10, when the dialysis patient is undergoing blood filtration, it can be avoided that the patient moves his arm during the dialysis process to puncture the blood vessel, thereby effectively improving the patient's comfort during the dialysis process;

[0033] The No. 1 rubber ring 7 on the inner wall of the protective tube 6 is squeezed and contacted with the outer side of the needle tube body 10, and the protective tube 6 can protect the needle tube body 10 and the puncture needle body 15. The limiting groove 8 can limit the auxiliary connecting plate 13 to move up and down. The length of the limiting groove 8 can ensure that the puncture needle body 15 is retracted into the inside of the No. 2 catheter 2 and the No. 1 catheter 1, and ensure the stability of the needle tube seat 9 moving inside the No. 2 catheter 2 and the No. 1 catheter 1.

[0034] This is how the retractable arteriovenous fistula puncture needle works.

[0035] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A retractable arteriovenous fistula puncture needle, comprising a No. 1 catheter (1), a No. 2 catheter (2) and a needle holder (9), characterized in that: The needle tube seat (9) is movably located inside the No. 1 catheter (1) and the No. 2 catheter (2). The top end of the needle tube seat (9) is connected to a puncture needle body (15). The puncture needle body (15) has an outer diameter of 1 mm and a length of 28 mm. A needle tube body (10) is movably arranged outside the puncture needle body (15). The needle tube body (10) adopts a plastic soft needle of an indwelling needle. The outer diameter of the needle tube body (10) is 1.6 mm. The needle tube seat (9) has a length of 25 mm, a plurality of groups of No. 2 rubber rings (11) are arranged on the outer side of the needle tube seat (9), and the No. 2 rubber rings (11) are in contact with the inner wall of the No. 1 catheter (1), a guide hole (12) is opened inside the needle tube seat (9), and the guide hole (12) is connected to the inside of the needle tube body (10), and the guide hole (12) is a circular arc hole, one side of the needle tube seat (9) is connected to a connecting plate (13), and one side of the connecting plate (13) is connected to a sliding plate (14).

2. The retractable arteriovenous fistula puncture needle according to claim 1, characterized in that: The second catheter (2) is detachably connected and installed on the top end of the first catheter (1), and the second catheter (2) and the first catheter (1) are threadedly connected. The top end of the second catheter (2) is connected to a connecting tube (5), and the connecting tube (5) is connected to the bottom end of the needle tube body (10).

3. The retractable arteriovenous fistula puncture needle according to claim 1, characterized in that: A long conduit connection seat (3) is connected to the interior of one side of the No. 2 conduit (2), and the long conduit connection seat (3) can be connected to the interior of the guide hole (12), and the other end of the long conduit connection seat (3) is connected to a connecting hose (4).

4. The retractable arteriovenous fistula puncture needle according to claim 2, characterized in that: The outer movable assembly of the needle tube body (10) is connected to a protective tube (6), the inner wall of the protective tube (6) is provided with a No. 1 rubber ring (7), and the No. 1 rubber ring (7) is in contact with the outer side of the needle tube body (10).

5. The retractable arteriovenous fistula puncture needle according to claim 1, characterized in that: A limiting groove (8) is provided through the outer side of the No. 1 conduit (1), and the limiting groove (8) is located on the outer side of the connecting plate (13).

6. The retractable arteriovenous fistula puncture needle according to claim 4, characterized in that: The first rubber ring (7) and the second rubber ring (11) are both made of flexible rubber material.

7. The retractable arteriovenous fistula puncture needle according to claim 1, characterized in that: The top end of the needle tube seat (9) is conical, and the needle tube seat (9) can be engaged, assembled and movably connected with the top inner wall of the connecting tube (5).

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