CN118383844B - Puncture tube and thrombus inspection method - Google Patents

Abstract

The present application provides a puncture tube and a method for checking thrombus. The puncture tube includes an outer blood drainage tube, an inner blood drainage tube, an outer blood return tube and an inner blood return tube. The outer blood drainage tube includes an outer drainage hole. The inner blood drainage tube and the outer blood drainage tube are pluggably connected. The inner blood drainage tube is arranged in the outer blood drainage tube. The inner blood drainage tube includes an inner drainage hole. The outer drainage hole and the inner drainage hole are connected. The outer drainage hole and the inner drainage hole are used to introduce blood into the central vein. The outer blood return tube includes a reflux outer hole. The outer blood return tube and the outer blood drainage tube are connected. The inner blood return tube and the outer blood return tube are pluggably connected. The inner blood return tube is arranged in the outer blood return tube. The outer blood return tube includes a reflux inner hole. The reflux outer hole and the reflux inner hole are connected. The reflux outer hole and the reflux inner hole are used to return blood to the central vein. The present application solves the problem that the existing puncture tube needs to be repeatedly punctured after checking whether there is thrombus, thereby reducing the risk of frequent punctures and the difficulty of puncture operations, and there is no need to change or terminate the treatment plan.

Description

Puncture tube and thrombus examination method

Technical Field

The present application relates to the technical field of medical equipment, and in particular to a puncture tube and a thrombus inspection method.

Background Art

Currently, patients who receive temporary renal replacement or artificial liver treatment need to use a puncture tube and central vein to establish access. Due to the large individual differences in the puncture technique of the operator who completes the puncture tube, the patient's volume and vascular shape and other anatomical factors, as well as the anticoagulation regimen during renal replacement therapy, different types of alarm prompts may appear on the hemodialysis machine during renal replacement therapy.

The reasons for the alarm may be improper positioning of the puncture tube (such as the side hole of the puncture tube is close to the blood vessel wall), inappropriate anticoagulant dosage, or local thrombosis formed at the head end of the puncture tube or in certain parts of the hemodialysis machine's supporting pipeline.

In order to determine whether the alarm is caused by local thrombosis at the tip of the puncture tube, the central venous puncture tube can be pulled out to check whether there is thrombosis at the tip of the tube. Although this method can check and confirm whether there is thrombosis in the tube, the central venous puncture tube must be reinserted to continue treatment such as renal replacement or artificial liver. Frequent puncture operations on patients may increase a series of puncture-related risks and increase the difficulty of subsequent puncture operations. Since the current puncture tube cannot be checked for thrombosis by a simple direct visual method, repeated punctures are required after checking whether there is thrombosis in the puncture tube in clinical work, which brings a series of problems such as increased puncture risks, difficulty in puncture operations, or the need to change or terminate treatment plans.

Summary of the invention

The purpose of the present application is to provide a puncture tube that avoids repeated punctures after checking for thrombus, which includes a blood drainage outer tube, a blood drainage inner tube, a blood return outer tube and a blood return inner tube. The blood drainage outer tube includes a drainage outer hole. The blood drainage inner tube and the blood drainage outer tube are pluggable and connected, and the blood drainage inner tube is arranged in the blood drainage outer tube. The blood drainage inner tube includes a drainage inner hole, and the drainage outer hole and the drainage inner hole are connected. The drainage outer hole and the drainage inner hole are used to introduce blood into the central vein. The blood return outer tube includes a return outer hole, and the blood return outer tube is connected. The blood return inner tube and the blood return outer tube are pluggable and connected, and the blood return inner tube is arranged in the blood return outer tube. The blood return outer tube includes a return inner hole, and the return outer hole and the return inner hole are connected. The return outer hole and the return inner hole are used to return blood to the central vein.

Optionally, the inner blood-drawing tube includes a first exposed section, and the first exposed section is exposed outside the outer blood-drawing tube.

Optionally, the puncture tube further includes a first buckle and a first protrusion, wherein the first buckle is disposed on the first exposed section, the first protrusion is disposed on the blood drawing outer tube, and the first buckle is snap-connected to the first protrusion.

Optionally, the first buckle and the end surface of the first exposed section are spaced apart, and the first protrusion and the end surface of the blood guide outer tube are spaced apart.

Optionally, the blood return inner tube includes a second exposed section, and the second exposed section is exposed outside the blood return outer tube.

Optionally, the puncture tube further includes a second buckle and a second protrusion, the second buckle is arranged on the second exposed section, the second protrusion is arranged on the blood return outer tube, and the second buckle is snap-connected to the second protrusion.

Optionally, the second buckle and the end surface of the second exposed section are spaced apart, and the second protrusion and the end surface of the blood return outer tube are spaced apart.

Optionally, the outer wall of the inner blood-drawing tube is tangent to the inner wall of the outer blood-drawing tube.

Optionally, the outer wall of the inner blood return tube is tangent to the inner wall of the outer blood return tube.

The present application also provides a thrombus inspection method, which uses a hemodialysis machine and the puncture tube, wherein the hemodialysis machine is connected to the blood introduction inner tube, and the hemodialysis machine is connected to the blood return inner tube, and the method comprises the following steps:

When the hemodialysis machine generates an alarm signal indicating that the pressure in the blood draw tube exceeds the value, the blood draw tube is pulled out and it is determined whether there is a thrombus in the blood draw tube; and

When the hemodialysis machine generates an alarm signal indicating that the pressure in the blood return inner tube exceeds a certain value, the blood return inner tube is pulled out and it is determined whether there is a thrombus in the blood return inner tube.

The beneficial effects of the present application are as follows: by setting a blood drawing outer tube, a blood drawing inner tube, a blood return outer tube and a blood return inner tube. The blood drawing outer tube includes a drainage outer hole. The blood drawing inner tube and the blood drawing outer tube are pluggably connected, the blood drawing inner tube is arranged in the blood drawing outer tube, the blood drawing inner tube includes a drainage inner hole, and the drainage outer hole and the drainage inner hole are connected. The blood return outer tube includes a reflux outer hole, and the blood return outer tube is connected. The blood return inner tube and the blood return outer tube are pluggably connected, the blood return inner tube is arranged in the blood return outer tube, the blood return outer tube includes a reflux inner hole, and the reflux outer hole and the reflux inner hole are connected.

Since the inner blood introduction tube and the outer blood introduction tube are pluggable and connected, and the inner blood return tube and the outer blood return tube are pluggable and connected, when checking whether there is a thrombus in the puncture tube, it is only necessary to remove the inner blood introduction tube and the inner blood return tube to check whether there is a thrombus, and there is no need to remove the outer blood introduction tube and the outer blood return tube, that is, after checking whether there is a thrombus, there is no need to re-puncture the puncture tube, thus avoiding repeated puncture operations.

The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application and implement it according to the contents of the specification, the present application is described in detail below with reference to the preferred embodiments of the present application and the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a cross-sectional view of a puncture tube and a partial enlarged view thereof in the first embodiment of the present application (only one of each of the first buckle, the first protrusion, the second buckle and the second protrusion is shown);

FIG2 is a schematic diagram of the connection between the puncture tube and the hemodialysis machine in the first embodiment of the present application (the blood inlet channel and the return blood channel are drawn after being interrupted, and the number of the first buckle, the first protrusion, the second buckle and the second protrusion is only one each);

3 is a partial cross-sectional view of the blood drawing outer tube and the blood drawing inner tube and a cross-sectional view of the first buckle and the first protrusion in the first embodiment of the present application;

FIG4 is a partial stereoscopic view of the blood drawing outer tube and the blood drawing inner tube and a stereoscopic view of the first buckle and the first protrusion in the first embodiment of the present application;

5 is a partial cross-sectional view of the blood return outer tube and the blood return inner tube and a cross-sectional view of the second buckle and the second protrusion in the first embodiment of the present application;

6 is a partial stereoscopic view of the blood return outer tube and the blood return inner tube, and a stereoscopic view of the second buckle and the second protrusion in the first embodiment of the present application;

FIG. 7 is a flow chart of a thrombus detection method in the second embodiment of the present application.

Wherein, the reference numerals are:

1. Puncture tube

10 Blood drainage tube

100 Drainage hole

11 Blood draw tube

110 Drainage hole

111 First exposure

12 Blood return tube

120 Reflux Outer Hole

13 Blood return inner tube

130 Reflux inner hole

131 Second exposure section

14 First Buckle

140 First horizontal section

141 First vertical part

142 First handle

15 First Bump

16 Second buckle

160 Second horizontal section

161 Second vertical part

162 Second handle

17 Second bulge

2 Hemodialysis Machine

21 Blood flow channel

22 blood vessels

A1 First plane

A2 Second plane

S1-S2: Steps of the thrombus detection method

DETAILED DESCRIPTION

The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the technology can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments. In order to enable those skilled in the art to better understand the present application scheme, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in the field without making creative work should fall within the scope of protection of the present application.

It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

First embodiment

As shown in FIG1 , in the present embodiment, a puncture tube 1 is provided, comprising a blood drainage outer tube 10, a blood drainage inner tube 11, a blood return outer tube 12 and a blood return inner tube 13. The blood drainage outer tube 10 comprises a drainage outer hole 100. The blood drainage inner tube 11 and the blood drainage outer tube 10 are pluggably connected, the blood drainage inner tube 11 is arranged in the blood drainage outer tube 10, the blood drainage inner tube 11 comprises a drainage inner hole 110, the drainage outer hole 100 and the drainage inner hole 110 are connected, and the drainage outer hole 100 and the drainage inner hole 110 are used to introduce blood in the central vein. The blood return outer tube 12 comprises a return outer hole 120, and the blood return outer tube 12 is connected to the blood drainage outer tube 10. The inner blood return tube 13 and the outer blood return tube 12 are pluggably connected. The inner blood return tube 13 is arranged in the outer blood return tube 12. The outer blood return tube 12 includes an inner return hole 130. The outer return hole 120 and the inner return hole 130 are connected. The outer return hole 120 and the inner return hole 130 are used to return blood to the central vein.

Please refer to Figure 1. The puncture tube 1 can be connected to the hemodialysis machine 2 (please refer to Figure 2 for the hemodialysis machine 2, the same below). The upper end of the puncture tube 1 can be punctured into the central vein of the patient. The lower end of the puncture tube 1 can be connected to the hemodialysis machine 2. The blood drawing inner tube 11 can be inserted into the blood drawing outer tube 10 or pulled out from the blood drawing outer tube 10 along the length direction of the blood drawing outer tube 10. The inner wall of the blood drawing outer tube 10 and the inner and outer walls of the blood drawing inner tube 11 can be provided with a heparin coating to reduce the possibility of forming local micro-thrombi. The outer diameter of the blood drawing inner tube 11 can be less than or equal to the inner diameter of the blood drawing outer tube 10.

As shown in FIG1 , the inner blood tube 11 and the outer blood tube 10 can be pluggably connected by hole-axis matching (i.e., the inner blood tube 11 is the axis, the inner wall of the outer blood tube 10 forms a hole, and the inner blood tube 11 is inserted into the hole formed by the inner wall of the outer blood tube 10). When the inner blood tube 11 is pulled out, the position of the outer blood tube 10 remains unchanged.

As shown in Figure 1, the drainage outer hole 100 can be located at the upper side and top of the blood drainage outer tube 10. The drainage inner hole 110 can be located at the upper side and top of the blood drainage inner tube 11. That is, the drainage outer hole 100 and the drainage inner hole 110 can be located in the patient's central vein. After the blood drainage inner tube 11 is pulled out, medical staff can observe whether there is a thrombus at the drainage inner hole 110. The blood in the patient's central vein can enter the blood drainage inner tube 11 through the drainage outer hole 100 and the drainage inner hole 110. The blood drainage inner tube 11 can transport the patient's blood to the hemodialysis machine 2 (please refer to Figure 2 for the hemodialysis machine 2).

As shown in FIG1 , the blood return inner tube 13 can be inserted into the blood return outer tube 12 or pulled out from the blood return outer tube 12 along the length direction of the blood return outer tube 12. The inner wall of the blood return outer tube 12 and the inner and outer walls of the blood return inner tube 13 can be provided with a heparin coating to reduce the possibility of forming local microthrombi. The outer diameter of the blood return inner tube 13 can be less than or equal to the inner diameter of the blood return outer tube 12. The blood return inner tube 13 and the blood return outer tube 12 can be pluggably connected by hole-axis matching (i.e., the blood return inner tube 13 is the axis, the inner wall of the blood return outer tube 12 encloses the hole, and the blood return inner tube 13 is inserted in the hole enclosed by the inner wall of the blood return outer tube 12). The blood refluxed by dialysis from the hemodialysis machine 2 (please refer to FIG2 for the hemodialysis machine 2) can be transported to the patient's central vein through the blood return inner tube 13 and the blood return outer tube 12. When the blood return inner tube 13 is pulled out, the position of the blood return outer tube 12 remains unchanged.

As shown in Fig. 1, the blood-introducing outer tube 10 and the blood-returning outer tube 12 can be connected by sharing a side wall. For example, the blood-introducing outer tube 10 and the blood-returning outer tube 12 can be connected in one piece.

As shown in FIG1 , the reflux outer hole 120 can be located at the upper side end and top end of the blood return outer tube 12. The reflux inner hole 130 can be located at the upper side end and top end of the blood return inner tube 13. That is, the reflux outer hole 120 and the reflux inner hole 130 can be located in the central vein of the patient. After the blood return inner tube 13 is pulled out, the medical staff can observe whether there is a thrombus at the reflux inner hole 130. The blood in the blood return inner tube 13 can flow back to the patient's central vein through the reflux inner hole 130 and the reflux outer hole 120.

As shown in FIG1 , the number of drainage outer holes 100 and drainage inner holes 110 can be multiple, and each drainage outer hole 100 and each drainage inner hole 110 can be arranged in one-to-one correspondence. For example, the drainage outer hole 100 can be coaxially arranged with the corresponding drainage inner hole 110. The number of reflux outer holes 120 and reflux inner holes 130 can be multiple, and each reflux outer hole 120 and each reflux inner hole 130 can be arranged in one-to-one correspondence. For example, the reflux outer hole 120 and the corresponding reflux inner hole 130 can be coaxially arranged.

As shown in FIG1 , since the inner blood introduction tube 11 and the outer blood introduction tube 10 are pluggable and connected, and the inner blood return tube 13 and the outer blood return tube 12 are pluggable and connected, when checking whether there is a thrombus in the puncture tube 1, it is only necessary to remove the inner blood introduction tube 11 and the inner blood return tube 13 to check whether there is a thrombus, and it is not necessary to remove the outer blood introduction tube 10 and the outer blood return tube 12, that is, after checking whether there is a thrombus, it is not necessary to re-puncture the puncture tube 1, thereby avoiding repeated puncture operations.

Please refer to Figures 2 and 3 at the same time. Optionally, the blood guide inner tube 11 includes a first exposed section 111, and the first exposed section 111 is exposed from the blood guide outer tube 10. The first exposed section 111 can be connected to the hemodialysis machine 2. Assuming that the first plane A1 coincides with the end face of the blood guide outer tube 10, the section of the blood guide inner tube 11 located outside the first plane A1 is the first exposed section 111. For example, if the first plane A1 coincides with the left end face of the blood guide outer tube 10, the section of the blood guide inner tube 11 located on the left side of the first plane A1 is the first exposed section 111. The outer wall of the first exposed section 111 can cooperate with the inner wall of the fixed section of the blood guide blood channel 21 of the hemodialysis machine 2, so the provision of the first exposed section 111 can facilitate the connection between the blood guide inner tube 11 and the blood guide blood channel 21 of the hemodialysis machine 2.

Please refer to Figures 3 and 4 at the same time. Optionally, the puncture tube 1 (please refer to Figure 1 for the puncture tube 1, the same below) also includes a first buckle 14 and a first protrusion 15. The first buckle 14 is arranged on the first exposed section 111, the first protrusion 15 is arranged on the blood drawing outer tube 10, and the first buckle 14 is snapped to the first protrusion 15. The first buckle 14 can be integrally formed with the first exposed section 111. The first buckle 14 can be arranged on the outer side wall of the first exposed section 111. The first protrusion 15 can be integrally formed with the blood drawing outer tube 10. The first protrusion 15 can be in the shape of a cuboid. The first protrusion 15 can be arranged on the outer side wall of the blood drawing outer tube 10.

As shown in Fig. 4, the number of the first buckles 14 and the first protrusions 15 can be multiple and arranged in pairs. The multiple first buckles 14 can be evenly distributed with reference to the central axis of the inner blood drawing tube 11. The multiple first protrusions 15 can be evenly distributed with reference to the central axis of the outer blood drawing tube 10.

Please refer to Figures 3 and 4 at the same time. After the first buckle 14 is engaged with the first protrusion 15, it can prevent the blood drawing inner tube 11 from falling out of the blood drawing outer tube 10. The more pairs of first buckles 14 and first protrusions 15 there are, the more reliable the fixation of the blood drawing inner tube 11 is. The first buckle 14 may include a first transverse portion 140 and a first vertical portion 141. The first transverse portion 140 is parallel to the axial direction of the blood drawing inner tube 11. The first vertical portion 141 is parallel to the radial direction of the blood drawing inner tube 11. The first transverse portion 140 and the first vertical portion 141 may be vertically and integrally connected.

Please refer to Figures 2 and 3 at the same time. The right end of the first transverse portion 140 can be hooked on the first protrusion 15. The blood drawing outer tube 10, the blood drawing inner tube 11, the first buckle 14 and the first protrusion 15 can be made of a softer material. For example, the material of the blood drawing outer tube 10, the blood drawing inner tube 11, the first buckle 14 and the first protrusion 15 can be polyurethane, silicone and polyvinyl chloride PVC. The first protrusion 15 can be broken off or scraped off to prevent the first protrusion 15 from obstructing the connection between the blood drawing outer tube 10 and the blood drawing blood channel 21 of the hemodialysis machine 2. Similarly, the first buckle 14 can also be broken off or scraped off.

Please refer to Figures 2 and 3 at the same time. Optionally, the first buckle 14 is spaced apart from the end face of the first exposed section 111, and the first protrusion 15 is spaced apart from the end face of the blood guide outer tube 10. The first buckle 14 can be spaced apart from the left end face of the first exposed section 111. The first vertical portion 141 can be arranged at the right end of the first exposed section 111 and abut against the left end of the blood guide outer tube 10. The first buckle 14 is spaced apart from the end face of the first exposed section 111 to prevent the first buckle 14 from obstructing the connection between the first exposed section 111 and the blood guide blood channel 21 of the hemodialysis machine 2. Because if the first buckle 14 and the end face of the first exposed section 111 are arranged flush, the first buckle 14 will block the connection between the first exposed section 111 and the blood guide blood channel 21 of the hemodialysis machine 2.

Please refer to Figures 2 and 3 at the same time. The first protrusion 15 can be spaced apart from the left end face of the blood drawing outer tube 10. The first protrusion 15 is spaced apart from the end face of the blood drawing outer tube 10 so that when the blood drawing outer tube 10 is used for drawing blood, the first protrusion 15 can be prevented from obstructing the connection between the blood drawing outer tube 10 and the blood drawing blood channel 21 of the hemodialysis machine 2.

Please refer to Figures 2, 5 and 6 at the same time. Optionally, the blood return inner tube 13 includes a second exposed section 131, and the second exposed section 131 is exposed outside the blood return outer tube 12. The second exposed section 131 can be connected to the blood return channel 22 of the hemodialysis machine 2. The second exposed section 131 and the first exposed section 111 can be arranged in a V shape so that the two do not interfere with each other when connected to the hemodialysis machine 2. Assuming that the second plane A2 and the end face of the blood return outer tube 12 coincide with each other, the section of the blood return inner tube 13 located outside the second plane A2 is the second exposed section 131.

For example, the second plane A2 can coincide with the left end face of the blood return outer tube 12, and the section of the blood return inner tube 13 located on the left side of the second plane A2 is the second exposed section 131. The outer wall of the second exposed section 131 can cooperate with the inner wall of the fixed section of the blood return blood channel 22 of the hemodialysis machine 2, so the second exposed section 131 can facilitate the connection between the blood return inner tube 13 and the blood return blood channel 22 of the hemodialysis machine 2.

Please refer to Figures 1 and 5 at the same time. Optionally, the puncture tube 1 also includes a second buckle 16 and a second protrusion 17. The second buckle 16 is arranged on the second exposed section 131, and the second protrusion 17 is arranged on the blood return outer tube 12. The second buckle 16 is clamped to the second protrusion 17. The second buckle 16 can be integrally formed with the second exposed section 131. The second buckle 16 can be arranged on the outer side wall of the second exposed section 131. The second protrusion 17 can be integrally formed with the blood return outer tube 12. The second protrusion 17 can be arranged on the outer side wall of the blood return outer tube 12. The second protrusion 17 can be in the shape of a cuboid.

Please refer to Figures 5 and 6 at the same time. The number of second buckles 16 and second protrusions 17 can be multiple and arranged in pairs. Multiple second buckles 16 can be evenly distributed with reference to the central axis of the blood return inner tube 13. Multiple second protrusions 17 can be evenly distributed with reference to the central axis of the blood return outer tube 12. The second buckle 16 is connected to the second protrusion 17 to prevent the blood return inner tube 13 from escaping from the blood return outer tube 12. The more pairs of second buckles 16 and second protrusions 17, the more reliable the fixation of the blood return inner tube 13.

Please refer to Figures 2 and 5 at the same time. The second buckle 16 may include a second transverse portion 160 and a second vertical portion 161. The second transverse portion 160 is parallel to the axial direction of the blood return inner tube 13, and the second vertical portion 161 is parallel to the radial direction of the blood return inner tube 13. The second transverse portion 160 and the second vertical portion 161 can be vertically and integrally connected. The right end of the second transverse portion 160 can be hooked to the second protrusion 17. The blood return outer tube 12, the blood return inner tube 13, the second buckle 16 and the second protrusion 17 can be made of a material with a softer texture. For example, the materials of the blood return outer tube 12, the blood return inner tube 13, the second buckle 16 and the second protrusion 17 can be polyurethane, silicone and polyvinyl chloride PVC. The second protrusion 17 can be broken off or scraped off to prevent the second protrusion 17 from obstructing the connection between the blood return outer tube 12 and the blood return blood channel 22 of the hemodialysis machine 2. Similarly, the second buckle 16 can also be broken off or scraped off.

Please refer to Figures 2 and 5 at the same time. Optionally, the second buckle 16 and the end face of the second exposed section 131 are spaced apart, and the second protrusion 17 and the end face of the blood return outer tube 12 are spaced apart. The second buckle 16 can be spaced apart from the left end face of the second exposed section 131. The second vertical portion 161 can be arranged at the right end of the second exposed section 131 and abut against the left end of the blood return outer tube 12. The second buckle 16 and the end face of the second exposed section 131 are spaced apart, so that the second buckle 16 can be prevented from obstructing the connection between the second exposed section 131 and the blood return channel 22 of the hemodialysis machine 2. Because if the second buckle 16 and the end face of the second exposed section 131 are arranged flush, the second buckle 16 will block the connection between the second exposed section 131 and the blood return channel 22 of the hemodialysis machine 2.

Please refer to Figures 2 and 5 at the same time. The second protrusion 17 can be spaced apart from the left end face of the blood return outer tube 12. The second protrusion 17 is spaced apart from the end face of the blood return outer tube 12, so that when the blood return outer tube 12 is used to transport the returned blood, the second protrusion 17 can be prevented from obstructing the connection between the blood return outer tube 12 and the blood return channel 22 of the hemodialysis machine 2.

Please refer to FIG. 3 to FIG. 6 at the same time. Optionally, the first buckle 14 includes a first handle portion 142, and the second buckle 16 includes a second handle portion 162. The first handle portion 142 and the second handle portion 162 may be in a cross shape. The first handle portion 142 may be located above the first transverse portion 140. The second handle portion 162 may be located above the second transverse portion 160. The medical staff may pinch the first handle portion 142 to unlock the first buckle 14 and pinch the second handle portion 162 to unlock the second buckle 16, thereby conveniently unlocking the first buckle 14 and the second buckle 16 without the aid of tools.

As shown in FIG1 , optionally, the outer wall of the inner blood tube 11 is tangent to the inner wall of the outer blood tube 10. The outer top wall of the inner blood tube 11 can be tangent to the inner top wall of the outer blood tube 10. The outer side wall of the inner blood tube 11 can be tangent to the inner side wall of the outer blood tube 10. The outer wall of the inner blood tube 11 is tangent to the inner wall of the outer blood tube 10, so that the inner blood tube 11 and the outer blood tube 10 can be closely fitted, avoiding the formation of a gap between the inner blood tube 11 and the outer blood tube 10, thereby preventing the blood from generating eddy currents or stagnation in the gap between the inner blood tube 11 and the outer blood tube 10.

As shown in FIG1 , optionally, the outer wall of the blood return inner tube 13 is tangent to the inner wall of the blood return outer tube 12. The outer top wall of the blood return inner tube 13 can be tangent to the inner top wall of the blood return outer tube 12, and the outer side wall of the blood return inner tube 13 can be tangent to the inner side wall of the blood return outer tube 12. The outer wall of the blood return inner tube 13 is tangent to the inner wall of the blood return outer tube 12, so that the blood return inner tube 13 and the blood return outer tube 12 can be closely fitted, avoiding the formation of a gap between the blood return inner tube 13 and the blood return outer tube 12, thereby preventing the blood from generating eddy currents or being retained in the gap between the blood return inner tube 13 and the blood return outer tube 12, thereby increasing the risk of increased local thrombosis.

As shown in FIG1 , when checking whether there is a thrombus in the blood drawing inner tube 11, the first buckle 14 can be unfastened first, the blood drawing outer tube 10 can be pressed to keep its position in the central vein unchanged, and then the first exposed section 111 can be pinched to pull the blood drawing inner tube 11 out of the blood drawing outer tube 10. After the blood drawing inner tube 11 is pulled out, the blood drawing outer tube 10 can still be used, which completes the inspection of whether there is a thrombus in the blood drawing inner tube 11, and there is no need to re-puncture the blood drawing outer tube 10. The blood drawing outer tube 10 is sleeved on the blood drawing inner tube 11, that is, the blood drawing outer tube 10 can be used as a backup of the blood drawing inner tube 11, and the blood drawing outer tube 10 can be used after the blood drawing inner tube 11 is discarded and not pulled out.

As shown in Figure 1, similarly, when checking whether there is a thrombus in the blood return inner tube 13, you can first unfasten the second buckle 16, press the blood return outer tube 12 to keep its position in the central vein unchanged, and then pinch the second exposed section 131 to pull the blood return inner tube 13 out of the blood return outer tube 12. After the blood return inner tube 13 is pulled out, the blood return outer tube 12 can still be used, which completes the inspection of whether there is a thrombus in the blood return inner tube 13, and there is no need to re-puncture the blood return outer tube 12. The blood return outer tube 12 is sleeved on the blood return inner tube 13, that is, the blood return outer tube 12 can be used as a backup of the blood return inner tube 13, and after the blood return inner tube 13 is discarded and no longer needs to be pulled out, the blood return outer tube 12 can continue to be used. For the single-needle double-lumen puncture tube 1, both the blood introduction inner tube 11 and the blood return inner tube 13 usually need to be pulled out for inspection.

Second embodiment

Please refer to FIG. 1 , FIG. 2 and FIG. 7 simultaneously. In this embodiment, a thrombus inspection method is provided, which uses a hemodialysis machine 2 and the puncture tube 1 in the first embodiment, the hemodialysis machine 2 is connected to the blood introduction inner tube 11, and the hemodialysis machine 2 is connected to the blood return inner tube 13, and includes the following steps:

S1: When the hemodialysis machine 2 generates an alarm signal that the pressure in the blood tube exceeds the value, pull out the inner blood tube 11 and determine whether there is a thrombus in the inner blood tube 11; the alarm signal that the pressure in the blood tube exceeds the value can be a sound signal of different frequencies and/or an image prompt signal of different colors on the display screen of the hemodialysis machine 2. For example, the red-level image is the most urgent alarm signal and must be processed immediately, otherwise the blood pump of the hemodialysis machine 2 may stop operating at any time. The yellow-level image is a general-level alarm signal and can be observed first. When medical staff sense the alarm signal that the pressure in the blood tube exceeds the value, they can unfasten the first buckle 14 and pull out the inner blood tube 11 to observe whether there is a thrombus in the inner blood tube 11.

S2: When the hemodialysis machine 2 generates an alarm signal that the pressure in the blood return tube exceeds a certain value, pull out the blood return tube 13 and determine whether there is a thrombus in the blood return tube 13. The alarm signal that the pressure in the blood return tube exceeds a certain value can be a sound signal of different frequencies and/or an image prompt signal of different colors on the display screen of the hemodialysis machine 2. For example, the red-level image is the most urgent alarm signal and must be processed immediately, otherwise the blood pump of the hemodialysis machine 2 may stop running at any time. The yellow-level image is a general-level alarm signal and can be observed first. When medical staff sense the alarm signal that the pressure in the blood return tube exceeds a certain value, they can unfasten the second buckle 16 and pull out the blood return tube 13 to observe whether there is a thrombus in the blood return tube 13.

The hemodialysis machine 2 is a hemodialysis machine. The hemodialysis machine 2 includes a monitoring alarm system and a dialysate supply system. The monitoring alarm system includes a blood pump, arteriovenous pressure monitoring, and air monitoring. The monitoring alarm system of the hemodialysis machine 2 is connected to the blood introduction inner tube 11 and the blood return inner tube 13, and can monitor the blood pressure in the blood introduction inner tube 11 and the blood return inner tube 13.

When the pressure of the inner blood tube 11 is lower than the normal value (for example, when the pressure value of the inner blood tube 11 is an extremely negative value of -250 mmHg) or the backflow is not smooth, the monitoring alarm system will generate an alarm signal of excessive pressure in the inner blood tube. When the pressure of the inner blood tube 13 exceeds the normal value (for example, when the pressure value of the inner blood tube 13 is 300 mmHg) or the backflow is not smooth, the monitoring alarm system of the hemodialysis machine 2 will generate an alarm signal of excessive pressure in the inner blood tube.

The above is a detailed introduction to the puncture tube and thrombus inspection method provided in the embodiments of the present application. For those skilled in the art, according to the ideas of the embodiments of the present application, there will be some changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation to the present application. All equivalent modifications or changes made according to the spirit and technical ideas of the present application should still be covered by the claims of the present application.

Claims (9)

1. A puncture tube, comprising: an external blood drainage tube, which includes an external drainage hole; An inner blood drainage tube, which is pluggably connected to the outer blood drainage tube, the inner blood drainage tube is arranged inside the outer blood drainage tube, the inner blood drainage tube comprises an inner drainage hole, the outer drainage hole is connected to the inner drainage hole, and the outer drainage hole and the inner drainage hole are used to introduce blood into the central vein; A blood return outer tube, comprising a return outer hole, the blood return outer tube being connected to the blood introduction outer tube; and The inner blood return tube is pluggably connected to the outer blood return tube. The inner blood return tube is arranged inside the outer blood return tube. The outer blood return tube includes an inner return hole. The outer return hole is connected to the inner return hole. The outer return hole and the inner return hole are used to return blood to the central vein. 2 . The puncture tube according to claim 1 , wherein the inner blood-drawing tube comprises a first exposed section, and the first exposed section is exposed outside the outer blood-drawing tube. 3. The puncture tube according to claim 2, characterized in that it also includes a first buckle and a first protrusion, the first buckle is arranged on the first exposed section, the first protrusion is arranged on the blood drawing outer tube, and the first buckle is connected to the first protrusion. 4 . The puncture tube according to claim 3 , wherein the first buckle and the end surface of the first exposed section are spaced apart, and the first protrusion and the end surface of the blood-drawing outer tube are spaced apart. 5 . The puncture tube according to claim 1 , wherein the blood return inner tube comprises a second exposed section, and the second exposed section is exposed outside the blood return outer tube. 6. The puncture tube according to claim 5, characterized in that it further comprises a second buckle and a second protrusion, wherein the second buckle is arranged on the second exposed section, the second protrusion is arranged on the blood return outer tube, and the second buckle is connected to the second protrusion. 7. The puncture tube according to claim 6, characterized in that the second buckle and the end surface of the second exposed section are spaced apart, and the second protrusion and the end surface of the blood return outer tube are spaced apart. 8. The puncture tube according to claim 1, characterized in that the outer wall of the inner blood drawing tube is tangent to the inner wall of the outer blood drawing tube. 9 . The puncture tube according to claim 1 , wherein the outer wall of the blood return inner tube is tangent to the inner wall of the blood return outer tube.