A hemodialysis catheter simulation teaching device

Abstract

The utility model belongs to the technical field of teaching tools, and specifically relates to a hemodialysis catheter simulation teaching device, comprising a human body partial model, a vascular circuit model is embedded and installed inside the human body partial model, two openings of the vascular circuit model extend out of the human body partial model, and a micro pump is connected and fixed between the two openings, a hemodialysis catheter is arranged on the human body partial model, the hemodialysis catheter is in a "Y" shape, wherein the insertion end extends downward into the pipeline of the vascular circuit model inside the human body partial model and is connected to the pipeline of the vascular circuit model (2), a sample adding tube is connected and fixed at the insertion tube facing downward of the hemodialysis catheter, a sealing mechanism is arranged on the sample adding tube, the sample adding tube is located outside the human body partial model, and a soft rubber nozzle is connected and fixed at the outer edge. The utility model allows adding blood clot dummy samples as needed, and maintains a good pulse sense while sampling, which is conducive to quickly practicing catheter function evaluation, flushing or sealing operations during hemodialysis teaching.

Description

Technical Field

[0001] The utility model belongs to the technical field of teaching tools, and specifically relates to a hemodialysis catheter simulation teaching device. Background Art

[0002] Hemodialysis is a common method of blood purification, which involves draining the patient's blood, removing toxins from the body through a blood purifier, and then returning the purified blood to the body. The indwelling hemodialysis catheter needs to undergo a catheter function assessment before use to determine whether it is unobstructed. Although medical staff will inject anticoagulants into the indwelling catheter to seal the catheter to maintain its patency, individual differences, prolonged catheterization, and improper patient activity may still lead to blood clots in the indwelling catheter. In clinical practice, the blood in the indwelling catheter needs to be drawn out and injected onto gauze to observe whether blood clots or blood foam appear to determine whether the patient's indwelling line is unobstructed. In addition, daily maintenance of the catheter also requires flushing and sealing operations.

[0003] However, the teaching and training of this process and the practice of trainees are not suitable for demonstration or operation on real patients. The existing teaching methods are usually oral explanations or the use of saline bags to simulate the suction of catheters. However, saline bags cannot simulate the difference between blocked or unobstructed indwelling catheters, and cannot simulate the blood flow of human blood vessels. When using saline bags for flushing or sealing operations, they cannot simulate the real situation, which is a poor experience and is not conducive to teaching.

[0004] Based on this, we propose a hemodialysis catheter simulation teaching device. Utility Model Content

[0005] The purpose of the utility model is to provide a hemodialysis catheter simulation teaching device, which can add blood clot dummy samples as needed and maintain a good sense of blood flow while sampling, which is conducive to the rapid practice of catheter function evaluation, flushing or sealing operations during hemodialysis teaching.

[0006] The technical solutions adopted in this utility are as follows:

[0007] A hemodialysis catheter simulation teaching device comprises a human body partial model, a vascular circuit model is embedded and installed inside the human body partial model, two openings of the vascular circuit model both extend out of the human body partial model, and a micro pump is connected and fixed between the two openings, a hemodialysis catheter is arranged on the human body partial model, the hemodialysis catheter is in a "Y" shape, wherein the insertion end extends downward into the pipeline of the vascular circuit model inside the human body partial model and is connected with the pipeline of the vascular circuit model, a sample adding tube is connected and fixed at the insertion tube facing downward of the hemodialysis catheter, a sealing mechanism is arranged on the sample adding tube, the sample adding tube is located outside the human body partial model, and a soft rubber nozzle is connected and fixed at the outer edge.

[0008] The sealing mechanism comprises a piston cylinder integrally connected with the sample adding tube, the piston cylinder and the sample adding tube are vertically arranged and communicated with each other, and a plunger is inserted axially inside, and the plunger is a cylindrical structure with a through hole in the middle.

[0009] The side wall of the plunger is interference fit with the piston cylinder.

[0010] A push rod is axially fixed at one end of the plunger, and the other end of the push rod extends axially out of the piston cylinder and is disc-shaped. The plunger can be moved by pushing the push rod outside the piston cylinder by hand, which makes it convenient for the through hole to be aligned with or staggered with the sample tube without inserting the hand into the piston cylinder.

[0011] A return spring is fixed to one end of the plunger away from the push rod. The return spring extends axially inside the piston cylinder and the other end of the return spring is fixed to the inner wall of the piston cylinder.

[0012] The clamping sleeve below the piston cylinder is provided with a concave support which is fixedly connected with the human body partial model.

[0013] The technical effects achieved by this utility model are:

[0014] This is a practical hemodialysis catheter simulation teaching device. During hemodialysis simulation teaching, the blood flow is simulated through a vascular circuit model and a pump. A sample tube is opened on the hemodialysis catheter to add a blood clot pseudo-colloid, so as to simulate the blockage of the hemodialysis catheter due to blood clots. It is used to guide trainees to use a syringe to connect the extracorporeal catheter of the hemodialysis catheter 4 to perform catheter function evaluation, flushing or sealing operations, so as to improve the teaching and practice effects of hemodialysis catheter maintenance operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a hemodialysis catheter simulation teaching device of the present invention;

[0016] Figure 2 is a schematic diagram of the practical vascular circuit model;

[0017] Figure 3 is a schematic diagram of a hemodialysis catheter of the present invention;

[0018] Figure 4 It is a schematic diagram of the practical push rod.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0020] 1. Human body partial model; 2. Vascular circuit model; 3. Micro pump; 4. Hemodialysis catheter; 5. Sample tube; 6. Soft rubber nozzle; 7. Piston cylinder; 8. Through hole; 9. Plunger; 10. Push rod; 11. Return spring; 12. Concave support. DETAILED DESCRIPTION

[0021] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with the embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0022] like Figure 1-4 As shown, a hemodialysis catheter simulation teaching device includes a human body local model 1, the human body local model 1 is used to simulate a human neck or arm, the human body local model 1 is composed of two half models that are mutually clamped, a vascular circuit model 2 is embedded and installed inside the human body local model 1, two openings of the vascular circuit model 2 extend out of the human body local model 1, and a micro pump 3 is connected and fixed between the two openings to simulate the blood flow in the blood vessel, a hemodialysis catheter 4 is arranged on the human body local model 1, and the hemodialysis catheter 4 is in a "Y" shape, wherein the insertion end of the hemodialysis catheter 4 extends downward into the vascular circuit model 2 inside the human body local model 1 The inside of the pipeline is connected with the pipeline of the vascular circuit model 2, which is used to simulate the real scene of the hemodialysis catheter 4 being inserted into the human blood vessel. The other two ends of the hemodialysis catheter 4 are located outside the local human model. The design of the other two ends of the hemodialysis catheter 4 is consistent with the structure of the external end of the existing hemodialysis catheter, and the other two ends of the hemodialysis catheter 4 are provided with liquid stop clamps to facilitate the simulation of flushing and sealing operations. The downward insertion tube of the hemodialysis catheter 4 is connected and fixed with a sample adding tube 5, and a sealing mechanism is provided on the sample adding tube 5. The sample adding tube 5 is located outside the local human model 1 and the outer edge is connected and fixed with a soft rubber nozzle 6.

[0023] like Figure 2 , Figure 3 and Figure 4 As shown, the sealing mechanism includes a piston cylinder 7 integrally connected to the sample tube 5. The piston cylinder 7 and the sample tube 5 are vertically arranged and connected to each other, and a plunger 9 is axially inserted inside. The plunger 9 is a cylindrical structure with a through hole 8 in the middle. The plunger 9 is moved until the through hole 8 partially overlaps with the sample tube 5 to open the sample tube 5. Otherwise, the through hole and the sample tube 5 are offset, and the plunger 8 closes the sample tube 5.

[0024] The plunger 9 is made of rubber material 9 , and the side wall of the plunger 9 is interference fit with the piston cylinder 7 .

[0025] A push rod 10 is axially fixed at one end of the plunger 9, and the other end of the push rod 10 extends axially out of the piston cylinder 7 and is disc-shaped. The plunger 9 can be moved by pushing the push rod 10 outside the piston cylinder 7 by hand, so that the through hole 8 is facing or staggered with the sample tube 5.

[0026] A return spring 11 is fixed to one end of the plunger 9 away from the push rod 10. The return spring 11 can be made of medical grade stainless steel. The return spring 11 extends axially inside the piston cylinder 7 and the other end of the return spring 11 is fixed to the inner wall of the piston cylinder 7. When in use, first push the push rod 10 to drive the plunger 9 to move toward the return spring 11 and compress the return spring 11 until the through hole 8 and the sample tube 5 at least partially overlap, and then the blood clot pseudo-sample colloid can be injected through the soft rubber nozzle 6. Release the push rod 10, the return spring 11 stretches and pushes the plunger 9 to make the through hole 8 offset from the piston cylinder 7, so as to automatically close the sample tube 5.

[0027] like Figure 1 and Figure 3 As shown, there is a concave support 12 fixedly connected to the human body partial model 1 in the clamping sleeve below the piston cylinder 7. The concave support 12 supports the piston cylinder 7 upward, which is convenient for instructors and students to use.

[0028] The working principle of the utility model is as follows: when conducting a hemodialysis teaching simulation, a sufficient amount of a blood sample based on a solution is provided in the vascular circuit model 2, and is fixedly connected to the two openings of the micro pump 3. The micro pump 3 is started to allow the blood sample to circulate unidirectionally along the vascular circuit model 2 to simulate the blood flow of the human body. When it is necessary to simulate the blockage of the hemodialysis catheter 4, a quantitative blood clot dummy sample colloid is sucked with a syringe and then connected to the soft rubber nozzle 6, the sealing mechanism is pressed to open the sample tube 5, and the blood clot dummy sample colloid is injected into the hemodialysis catheter 4 along the sample tube 5, and then the sample tube 5 is closed. In this process, in order to facilitate the injection of the blood clot dummy sample colloid, the liquid stop clamp on the external end of the hemodialysis catheter 4 can be temporarily opened. Instruct the trainees to use a syringe to connect the extracorporeal catheter of the hemodialysis catheter 4 to perform catheter function evaluation, flushing or sealing operations, so as to teach and practice the maintenance operation of the hemodialysis catheter.

[0029] The above is only a preferred embodiment of the present invention. It should be noted that, for ordinary technicians in the field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A hemodialysis catheter simulation teaching device, comprising a human body part model (1), characterized in that: A vascular circuit model (2) is embedded and installed inside the human body partial model (1), two openings of the vascular circuit model (2) both extend out of the human body partial model (1), and a micro pump (3) is connected and fixed between the two openings. A hemodialysis catheter (4) is provided on the human body partial model (1), and the hemodialysis catheter (4) is in a "Y" shape, wherein the insertion end extends downward into the pipeline of the vascular circuit model (2) inside the human body partial model (1) and is connected to the pipeline of the vascular circuit model (2). A sample addition tube (5) is connected and fixed at the insertion tube downward of the hemodialysis catheter (4), and a sealing mechanism is provided on the sample addition tube (5). The sample addition tube (5) is located outside the human body partial model (1), and a soft rubber nozzle (6) is connected and fixed at the outer edge.

2. A hemodialysis catheter simulation teaching device according to claim 1, characterized in that: The sealing mechanism comprises a piston cylinder (7) integrally connected to the sample adding tube (5); the piston cylinder (7) and the sample adding tube (5) are arranged perpendicularly to each other and are in communication with each other, and a plunger (9) is inserted axially inside; the plunger (9) is a cylindrical structure with a through hole (8) in the middle.

3. A hemodialysis catheter simulation teaching device according to claim 2, characterized in that: The side wall of the plunger (9) is interference fit with the piston cylinder (7).

4. A hemodialysis catheter simulation teaching device according to claim 2, characterized in that: A push rod (10) is axially fixed to one end of the plunger (9), and the other end of the push rod (10) extends axially out of the interior of the piston cylinder (7) and is in the shape of a disc.

5. A hemodialysis catheter simulation teaching device according to claim 4, characterized in that: A return spring (11) is fixed to one end of the plunger (9) away from the push rod (10); the return spring (11) extends axially inside the piston cylinder (7) and the other end of the return spring (11) is fixed to the inner wall of the piston cylinder (7).

6. A hemodialysis catheter simulation teaching device according to claim 2, characterized in that: A concave support (12) is provided on the lower sleeve of the piston cylinder (7) and is fixedly connected to the human body partial model (1).

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