Auxiliary measurement component and auxiliary measurement method thereof

Abstract

The present invention discloses an auxiliary measurement component and an auxiliary measurement method, belonging to the technical field of medical devices, the auxiliary measurement component comprises a first marking clip, the first marking clip comprises a first clamping part and a second clamping part, the first end of the first clamping part is arranged at the first end of the second clamping part, the second end of the first clamping part is provided with a first hook, the second end of the second clamping part is provided with a second hook, when the first hook is engaged with the second hook, a first clamping hole is formed between the first clamping part and the second clamping part, the first clamping hole comprises: a first section on its second end side; a second section on its first end side; when the guide wire enters the second section from the first section, the first marking clip can be fixed on the guide wire; auxiliary measurement method. The first marking clip of the present invention can mark the guide wire insertion entrance position, the length of the insertion section in the catheter body can be calculated through a single chest anteroposterior X-ray film, and then the length of the subcutaneous tunnel section can be determined to ensure that the tip of the catheter is located at the junction of the superior vena cava and the right atrium.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to an auxiliary measurement component and an auxiliary measurement method thereof. Background Art

[0002] The semi-permanent hemodialysis catheter of the internal jugular vein (hereinafter referred to as the "catheter") is an important dialysis access for hemodialysis treatment. From the distal end to the tip, the semi-permanent hemodialysis catheter of the internal jugular vein includes: the extracorporeal segment of the double-lumen tube, the subcutaneous tunnel segment, and the intracorporeal insertion segment. Among them, the total length of the catheter = the length of the extracorporeal segment + the length of the subcutaneous tunnel segment + the length of the intracorporeal insertion segment. The tip of the intracorporeal insertion segment of the catheter should be located at the junction of the superior vena cava and the right atrium, which can ensure the dialysis blood flow and reduce the impact of the catheter on the heart.

[0003] During the semi-permanent catheterization of the internal jugular vein, the length of the in-vivo insertion segment is often determined by surface positioning. The junction of the superior vena cava and the right atrium is usually projected on the third rib or the third and fourth intercostal spaces. However, the error of the in-vivo insertion segment length determined by the surface positioning method is large. Conventional postoperative chest X-rays usually find that the tip of the in-vivo insertion segment is too deep or too shallow. However, at this time, the subcutaneous tunnel segment of the hemodialysis tube has been established, and it is difficult to adjust the catheter position.

[0004] Surgical operation under DSA can effectively solve this problem. However, DSA has high requirements for medical equipment and high operating costs. If multiple dynamic fluoroscopy operations are performed, patients and medical staff will be exposed to large doses of radiation. Therefore, there is an urgent need for a safe and effective operation method that can ensure the insertion depth and final position of the tip of the internal jugular vein hemodialysis tube. Summary of the invention

[0005] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide an auxiliary measurement component. The first marking clip can mark the position of the guide wire insertion entrance. The length of the insertion section in the catheter body can be calculated through a single chest anteroposterior X-ray film, and then the length of the subcutaneous tunnel section can be determined to ensure that the tip of the catheter is located at the junction of the superior vena cava and the right atrium.

[0006] A second objective of the present invention is to provide an auxiliary measurement method of an auxiliary measurement component.

[0007] To achieve the above object, the technical solution of the present invention provides an auxiliary measurement assembly. The auxiliary measurement assembly includes a first marker clip for fixing to a guide wire. The first marker clip is made of a metal material. The first marker clip includes a first end and a second end along its length direction. The first marker clip includes a first clamping portion and a second clamping portion arranged opposite to each other. The first end of the first clamping portion is provided at the first end of the second clamping portion. A first hook is provided at the second end of the first clamping portion. A second hook capable of engaging or disengaging with the first hook is provided at the second end of the second clamping portion. When the first hook engages with the second hook, a first clamping hole is formed between the first clamping portion and the second clamping portion. The first clamping hole includes: a first section on the second end side thereof, the width of the first section being a; a second section on the first end side of the first clamping hole, the width of the second section being b, where b < a; a third section between the second end side and the first end side of the first clamping hole, the width of the third section gradually decreasing from its second end side to its first end side. When the guide wire enters the second section from the first section, the first marker clip can be fixed to the guide wire.

[0008] Further, the auxiliary measurement assembly further includes a scale device, and the scale device includes:

[0009] A scale, on one side wall of the scale, there is a first scale line along its length direction, and the zero scale line of the first scale line is provided at one end of the scale;

[0010] A sliding seat, which is slidably mounted on the scale along the length direction of the scale;

[0011] A second marker clip for fixing to a catheter, the second marker clip is detachably mounted on the sliding seat. The second marker clip includes a third end and a fourth end along its length direction. The second marker clip includes a third clamping portion and a fourth clamping portion arranged opposite to each other. The third end of the third clamping portion is provided at the third end of the fourth clamping portion. A third hook is provided at the fourth end of the third clamping portion. A fourth hook capable of engaging or disengaging with the third hook is provided at the fourth end of the fourth clamping portion. When the third hook engages with the fourth hook, a second clamping hole is formed between the third clamping portion and the fourth clamping portion. The second clamping hole includes: a fourth section on the fourth end side thereof, the width of the fourth section being c; a fifth section on the third end side of the second clamping hole, the width of the fifth section being d, where d < c; a sixth section between the fourth end side and the third end side of the second clamping hole, the width of the sixth section gradually decreasing from its fourth end side to its third end side. When the catheter enters the fifth section from the fourth section, the second marker clip can be fixed to the catheter.

[0012] Further, a silica gel layer is provided on the inner walls of the fourth section, the fifth section and the sixth section.

[0013] Furthermore, the outer surface of one end of the sliding seat is provided with a card seat or a card joint;

[0014] The outer surface of the third end of the second marking clip is provided with a card connector or a card connector seat.

[0015] Furthermore, the side wall where the first scale line is located on the ruler is also provided with a second scale line along its length direction, and the zero scale line of the second scale line is provided at the other end of the ruler.

[0016] Furthermore, the sliding seat is provided with a through hole matching the cross-section of the ruler, the ruler is slidably installed in the through hole, the side wall of the sliding seat corresponding to the first scale line of the ruler is provided with an indicator line, the indicator line is arranged colinearly with the axis of the catheter fixed by the second marking clamp, and the middle part of the side wall is provided with an opening passing through it along its length direction.

[0017] Furthermore, the sliding seat is made of a transparent hard material, and the ruler is made of a hard material.

[0018] In order to achieve the above object, a second aspect of the present invention provides an auxiliary measurement method of an auxiliary measurement component, wherein the auxiliary measurement component described in any one of the above technical solutions is used for measurement, and the auxiliary measurement method comprises the following steps:

[0019] The first marker clip is fixed, and when the patient is in a supine position, the internal jugular vein is punctured, a guide wire is inserted through the neck skin insertion port, and the first marker clip is fixed to the neck skin insertion port of the guide wire;

[0020] The in vivo insertion length of the semi-permanent hemodialysis tube of the internal jugular vein is obtained, a chest AP X-ray is performed, and the X-ray image is retrieved to calculate the in vivo insertion length, which is the length of the guidewire from the first marker clip to the superior vena cava atrium junction.

[0021] Further, after obtaining the length of the in vivo implantation section of the internal jugular vein semi-permanent hemodialysis tube, the method further includes:

[0022] Determine the intravital insertion section position of the internal jugular vein semi-permanent hemodialysis tube, align the zero scale line of the first scale line of the ruler with the tip of the subcutaneous tunnel section of the internal jugular vein semi-permanent hemodialysis tube, slide the sliding seat of the ruler device to a fixed position according to the intravital insertion section length, fix the second marking clip on the internal jugular vein semi-permanent hemodialysis tube, and the intravital insertion section length is equal to the scale value corresponding to the first scale line at the fixed position.

[0023] Further, after determining the in vivo placement position of the semi-permanent hemodialysis tube of the internal jugular vein, the method further includes:

[0024] Obtain the subcutaneous tunnel section length of the internal jugular vein semi-permanent hemodialysis tube, slide the ruler toward the distal end of the internal jugular vein semi-permanent hemodialysis tube, align the zero scale line of the second scale line of the ruler with the proximal end of the double-lumen tube fixed wing of the internal jugular vein semi-permanent hemodialysis tube, and read the subcutaneous tunnel section length, which is the scale value of the second scale line of the ruler corresponding to the position of the second marking clip.

[0025] In the present invention, the first marker clip is made of metal material, which can display a metal shadow in an X-ray film, providing a basis for measuring the length of the in-vivo insertion section of the catheter, and at the same time, the first marker clip can be firmly fixed on the guide wire to prevent the guide wire from accidentally slipping into the blood vessel. When the first marker clip is fixed on the guide wire, the first marker clip can mark the guide wire insertion entrance position. Through a single chest anteroposterior X-ray film, the guide wire length between the two positions can be determined according to the first marker clip position and the junction of the superior vena cava and the right atrium, and the length is the in-vivo insertion section length of the catheter; the in-vivo section length of the tube can be measured by a measuring tool outside the patient's body; according to the in-vivo insertion section length, the second marker clip of the ruler device can slide along the ruler and be fixed to the distal end of the in-vivo insertion section on the catheter, and the second scale line of the ruler can be used to measure the distance between the second marker clip and the proximal end of the fixed wing of the double-lumen tube, that is, the subcutaneous tunnel section length; according to the subcutaneous tunnel section length, the subcutaneous tunnel path is designed, and the in-vivo insertion section length can be accurately controlled, thereby ensuring that the catheter tip is located at the junction of the superior vena cava and the right atrium after surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a first marking clip of an auxiliary measurement assembly provided by an embodiment of the present invention;

[0027] Figure 2 is a structural schematic diagram of a scale device of an auxiliary measurement assembly provided in an embodiment of the present invention;

[0028] Figure 3 yes Figure 2 Structural schematic diagram of the middle sliding seat;

[0029] Figure 4 yes Figure 2 A schematic diagram of the structure of the second marking clip;

[0030] Figure 5 It is a flow chart of the auxiliary measurement method provided by an embodiment of the present invention.

[0031] Wherein: 1. First marker clip; 11. First clamping part; 12. Second clamping part; 13. First hook; 14. Second hook; 15. First clamping hole; 151. First section; 152. Second section; 153. Third section; 2. Scale device; 21. Scale; 211. First scale line; 212. Second scale line; 22. Sliding seat; 221. Clamping seat; 222. Through hole; 223. Indicator line; 224. Opening; 23. Second marker clip; 231. Third clamping part; 232. Fourth clamping part; 233. Third hook; 234. Fourth hook; 235. Second clamping hole; 2351. Fourth section; 2352. Fifth section; 2353. Sixth section; 236. Clamping head; 237. Silicone layer;

[0032] In the figure, the width of the first section is a, the width of the second section is b, the width of the fourth section is c, and the width of the fifth section is d. Specific implementation mode

[0033] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0034] Embodiment 1: The embodiment of the present invention provides an auxiliary measurement component, as Figure 1 shown, the auxiliary measurement component includes a first marker clip 1 for fixing to a guide wire. The first marker clip is made of a metal material. The first marker clip includes a first end and a second end along its length direction. The first marker clip 1 includes a first clamping part 11 and a second clamping part 12 which are oppositely arranged. The first end of the first clamping part 11 is arranged at the first end of the second clamping part 12. The first clamping part 11 and the second clamping part 12 can be integrally formed. A first hook 13 is arranged at the second end of the first clamping part 11, and a second hook 14 capable of engaging or disengaging with the first hook 13 is arranged at the second end of the second clamping part 12. When the first hook 13 engages with the second hook 14, a first clamping hole 15 is formed between the first clamping part 11 and the second clamping part 12. The first clamping hole includes: a first section 151 on the second end side thereof, the width of the first section is a; a second section 152 on the first end side of the first clamping hole 15, the width of the second section is b, where b < a; a third section 153 between the second end side and the first end side of the first clamping hole 15, the width of the third section gradually decreases from its second end side to its first end side. The third section 153 has a guiding function, enabling the guide wire to easily enter the second section 152 from the first section 151 or enter the first section 151 from the second section 152. When the guide wire enters the second section 152 from the first section 151, the first marker clip 1 can be fixed to the outside of the skin insertion port on the guide wire.

[0035] The first marker clip 1 is made of metal materials such as iron and stainless steel, and can display a metal shadow in an X-ray film, providing a basis for measuring the length of the catheter's in vivo insertion section. At the same time, the first marker clip 1 can be firmly fixed on the guide wire to prevent the guide wire from accidentally slipping into the blood vessel. When the first marker clip 1 is fixed on the guide wire, the first marker clip 1 can mark the guide wire entry position. Through a single chest anteroposterior X-ray film, the guide wire length between the two positions can be determined based on the position of the first marker clip 1 and the junction of the superior vena cava and the right atrium. This length is the in vivo insertion section length of the catheter. Since the extracorporeal section length of the catheter can be measured by a measuring tool outside the patient's body, the subcutaneous tunnel section length of the catheter can be determined to ensure that the tip of the catheter is located at the junction of the superior vena cava and the right atrium.

[0036] In this embodiment, Figures 2 to 4As shown in the figure, the auxiliary measurement assembly further includes a scale device 2, and the scale device 2 includes a scale 21, a sliding seat 22, and a second marker clip 23 for fixing to the catheter. On one side wall of the scale 21, there is a first scale line 211 along its length direction, and the zero scale line of the first scale line is provided at one end of the scale 21; the sliding seat 22 is slidably mounted on the scale 21 along the length direction of the scale; the second marker clip 23 is detachably mounted on the sliding seat 22. The second marker clip 23 includes a third end and a fourth end along its length direction. The second marker clip includes a third clamping portion 231 and a fourth clamping portion 232 arranged oppositely. The third end of the third clamping portion is connected to the third end of the fourth clamping portion. A third hook 233 is provided at the fourth end of the third clamping portion, and a fourth hook 234 capable of engaging or disengaging with the third hook 233 is provided at the fourth end of the fourth clamping portion. When the third hook 233 engages with the fourth hook 234, a second clamping hole 235 is formed between the third clamping portion 231 and the fourth clamping portion 232. The second clamping hole 235 includes: a fourth section 2351 on the fourth end side thereof, and the width of the fourth section is c; a fifth section 2352 on the third end side of the second clamping hole 235, and the width of the fifth section is d, where d < c; a sixth section 2353 between the fourth end side and the third end side of the second clamping hole 235, and the width of the sixth section gradually decreases from its own fourth end side to its third end side. When the catheter enters the fifth section 2352 from the fourth section 2351, the second marker clip 23 can be fixed to the catheter. Before establishing the subcutaneous tunnel, the zero scale line of the first scale line 211 of the scale 21 can be aligned with the tip of the semi-permanent hemodialysis catheter of the internal jugular vein in the subcutaneous tunnel section. Slide the second marker clip 23 along the scale 21 and fix it at the position corresponding to the length of the in-vivo insertion section on the first scale line 211. The distance between the second marker clip 23 and the proximal end of the fixed wing of the double-lumen tube is the length of the subcutaneous tunnel section. By accurately planning the length of the external section and the accurately measurable length of the subcutaneous tunnel section, the length of the in-vivo insertion section can be accurately controlled, thereby ensuring that the catheter tip is located at the junction of the superior vena cava and the right atrium after the operation. Specifically, the sliding seat 22 can be made of transparent rigid materials such as plastic and acrylic, which is convenient for observing the scale lines on the scale 21. The scale 21 can be made of rigid materials such as metal, wood, plastic, and acrylic.

[0037] Further, as Figures 2 to 4 shown in the figure, one of a clamping seat 221 or a clamping head 236 is provided on the outer surface of one end of the sliding seat 22; the other of the clamping head 236 or the clamping seat 221 is provided on the outer surface of the third end of the second marker clip 23, so that the second marker clip 23 is detachably mounted on the sliding seat 22. When the second marker clip 23 is mounted on the sliding seat 22, it is convenient to use the scale 21 for measurement; when the sliding seat 22 and the second marker clip 23 are disassembled, the catheter can be conveniently bent so that the subcutaneous tunnel section on the catheter matches the tunnel needle, thereby assisting in planning the length of the subcutaneous tunnel, and then establishing a subcutaneous tunnel with an appropriate length to ensure that the catheter tip is located at the junction of the superior vena cava and the right atrium after the operation.

[0038] Further, if Figure 4 As shown, the inner walls of the fourth section 2351 , the fifth section 2352 and the sixth section 2353 are provided with a silicone layer 237 . The silicone layer is soft and will not damage the catheter. It is also non-slip and can fix the catheter to the fifth section 2352 .

[0039] Further, if Figure 2 As shown, the side wall where the first scale line 211 of the ruler 21 is located is also provided with a second scale line 212 along its length direction, and the zero scale line of the second scale line is provided at the other end of the ruler 21. The second marking clip 23 can slide along the ruler 21, so that the zero scale line of the first scale line 211 of the ruler 21 can be aligned with the tip of the catheter, and the second marking clip 23 can be fixed to the catheter according to the measured length of the intracorporeal insertion section; the zero scale line of the second scale line 212 can be aligned with the proximal end of the double-lumen fixing wing of the catheter, and the subcutaneous tunnel section length of the catheter can be read by the scale value of the second scale line 212 corresponding to the position of the second marking clip 23.

[0040] Further, if Figure 2 , Figure 3 As shown, the sliding seat 22 is provided with a through hole 222 matching the cross section of the ruler 21, and the ruler 21 is slidably installed in the through hole. The side wall of the sliding seat 22 corresponding to the first scale line 211 of the ruler 21 is provided with an indicator line 223, and the indicator line is colinearly arranged with the axis of the catheter fixed in the second marking clamp 23, and the scale value of the sliding seat 22 corresponding to the first scale line 211 or the second scale line 212 can be accurately read through the indicator line; the middle part of the side wall is provided with an opening 224 running through it along its length direction, and the sliding seat 22 can be conveniently installed on the ruler 21 by adjusting the opening, and it is convenient to replace the ruler 21 or the sliding seat 22.

[0041] Embodiment 2: The present invention provides an auxiliary measurement method of an auxiliary measurement component, using the auxiliary measurement component described in any one of the above technical solutions to perform measurement, such as Figure 5 As shown, the auxiliary measurement method includes the following steps:

[0042] Step S1, fix the first marker clip 1, when the patient is in a supine position, puncture the internal jugular vein, insert a guide wire through the neck skin insertion port, and fix the first marker clip 1 to the neck skin insertion port of the guide wire.

[0043] Step S2, obtaining the in vivo insertion length of the semi-permanent hemodialysis tube of the internal jugular vein, completing a chest AP X-ray, retrieving the X-ray image to calculate the in vivo insertion length, which is the length of the guidewire from the first marking clip 1 to the superior vena cava atrium junction.

[0044] Furthermore, step S2 also includes step S3, determining the intravital insertion section position of the internal jugular vein semi-permanent hemodialysis tube, aligning the zero scale line of the first scale line 211 of the ruler 21 with the tip of the subcutaneous tunnel section of the internal jugular vein semi-permanent hemodialysis tube, sliding the sliding seat 22 of the ruler device 2 to a fixed position according to the intravital insertion section length, fixing the second marking clip 23 on the internal jugular vein semi-permanent hemodialysis tube, and the intravital insertion section length is equal to the scale value corresponding to the first scale line 211 at the fixed position.

[0045] Furthermore, step S3 also includes step S4, obtaining the length of the subcutaneous tunnel section of the internal jugular vein semi-permanent hemodialysis tube, sliding the ruler 21 toward the distal side of the internal jugular vein semi-permanent hemodialysis tube, aligning the zero scale line of the second scale line 212 of the ruler 21 with the proximal end of the double-lumen tube fixed wing of the internal jugular vein semi-permanent hemodialysis tube, and reading the length of the subcutaneous tunnel section, which is the scale value of the second scale line 212 of the ruler 21 corresponding to the position of the second marking clip 23.

[0046] During the operation, when the catheter is inserted into the human body, the subcutaneous tunnel path can be designed according to the length of the subcutaneous tunnel section, and a subcutaneous tunnel can be established between the neck incision and the chest wall exit. The subcutaneous tissue is first expanded along the guide wire twice with a dilator tube, and a detachable dilator catheter is inserted along the steel wire. The guide wire is withdrawn, and the catheter is inserted as usual. After the operation, the routine fixation and bandage are performed to complete the operation.

[0047] The auxiliary measurement method of the auxiliary measurement component uses the auxiliary measurement component of any of the above technical solutions, and thus has all the above beneficial effects, which will not be described in detail here.

[0048] In the auxiliary measurement method of the auxiliary measurement component, before the catheter is placed in the human body, the in vivo insertion section length of the catheter can be determined according to the guide wire length from the first marking clip 1 to the superior vena cava atrium junction in a single chest anteroposterior X-ray film, and then the subcutaneous tunnel section length can be accurately measured using the ruler device 2 according to the in vivo insertion section length and the extracorporeal section length, so that when the catheter is placed in the human body, the extracorporeal section length and the subcutaneous tunnel length can be accurately controlled to ensure that the tip of the catheter is located at the junction of the superior vena cava and the right atrium.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An auxiliary measurement component, characterized in that, the auxiliary measurement component includes a first marker clip for fixing to a guide wire. The first marker clip is made of a metal material. The first marker clip includes a first end and a second end along its length direction. The first marker clip includes a first clamping portion and a second clamping portion arranged oppositely. The first end of the first clamping portion is provided at the first end of the second clamping portion. A first hook is provided at the second end of the first clamping portion. A second hook capable of engaging or disengaging with the first hook is provided at the second end of the second clamping portion. When the first hook engages with the second hook, a first clamping hole is formed between the first clamping portion and the second clamping portion. The first clamping hole includes: a first section on the second end side thereof, the width of the first section being a; a second section on the first end side of the first clamping hole, the width of the second section being b, where b < a; a third section between the second end side and the first end side of the first clamping hole, the width of the third section gradually decreasing from its own second end side to its first end side. When the guide wire enters the second section from the first section, the first marker clip can be fixed to the guide wire; the auxiliary measurement component further includes a scale device, and the scale device includes: a scale, on one side wall of the scale, a first scale line is provided along its length direction, and the zero scale line of the first scale line is provided at one end of the scale; a sliding seat, the sliding seat is slidably mounted on the scale along the length direction of the scale; a second marker clip for fixing to a catheter, the second marker clip is detachably mounted on the sliding seat. The second marker clip includes a third end and a fourth end along its length direction. The second marker clip includes a third clamping portion and a fourth clamping portion arranged oppositely. The third end of the third clamping portion is provided at the third end of the fourth clamping portion. A third hook is provided at the fourth end of the third clamping portion. A fourth hook capable of engaging or disengaging with the third hook is provided at the fourth end of the fourth clamping portion. When the third hook engages with the fourth hook, a second clamping hole is formed between the third clamping portion and the fourth clamping portion. The second clamping hole includes: a fourth section on the fourth end side thereof, the width of the fourth section being c; a fifth section on the third end side of the second clamping hole, the width of the fifth section being d, where d < c; a sixth section between the fourth end side and the third end side of the second clamping hole, the width of the sixth section gradually decreasing from its own fourth end side to its third end side. When the catheter enters the fifth section from the fourth section, the second marker clip can be fixed to the catheter; silica gel layers are provided on the inner walls of the fourth section, the fifth section and the sixth section; either a clamping seat or a clamping head is provided on the outer surface of one end of the sliding seat; the other of the clamping head or the clamping seat is provided on the outer surface of the third end of the second marker clip; when using the described auxiliary measurement component for measurement, the specific steps are as follows: Fix the first marker clip. When the patient takes a supine position, puncture through the internal jugular vein, insert the guide wire through the skin entrance in the neck, and fix the first marker clip at the skin entrance in the neck of the guide wire; The in vivo insertion length of the semi-permanent hemodialysis tube of the internal jugular vein is obtained, a chest AP X-ray is performed, and the X-ray image is retrieved to calculate the in vivo insertion length, which is the length of the guidewire from the first marker clip to the superior vena cava atrium junction.

2. The auxiliary measurement assembly according to claim 1, It is characterized in that The side wall where the first scale line is located on the ruler is also provided with a second scale line along its length direction, and the zero scale line of the second scale line is arranged at the other end of the ruler.

3. The auxiliary measurement assembly according to claim 2, It is characterized in that The sliding seat is provided with a through hole matching the cross-section of the ruler, and the ruler is slidably installed in the through hole. The side wall of the sliding seat corresponding to the first scale line of the ruler is provided with an indicator line, and the indicator line is arranged colinearly with the axis of the catheter fixed by the second marking clamp. The middle part of the side wall is provided with an opening penetrating therein along its length direction.

4. The auxiliary measurement assembly as claimed in claim 3, It is characterized in that The sliding seat is made of transparent hard material, and the ruler is made of hard material.

5. The auxiliary measurement assembly according to claim 1, It is characterized in that When the auxiliary measurement component is used to measure, after obtaining the in vivo insertion length of the semi-permanent hemodialysis tube of the internal jugular vein, the method further includes: Determine the intravital insertion section position of the internal jugular vein semi-permanent hemodialysis tube, align the zero scale line of the first scale line of the ruler with the tip of the subcutaneous tunnel section of the internal jugular vein semi-permanent hemodialysis tube, slide the sliding seat of the ruler device to a fixed position according to the length of the intravital insertion section, fix the second marking clip on the internal jugular vein semi-permanent hemodialysis tube, and the length of the intravital insertion section is equal to the scale value corresponding to the first scale line at the fixed position.

6. The auxiliary measurement assembly according to claim 5, It is characterized in that When the auxiliary measurement component is used to perform measurement, after determining the in vivo insertion section position of the internal jugular vein semi-permanent hemodialysis tube, the method further includes: Obtain the subcutaneous tunnel section length of the internal jugular vein semi-permanent hemodialysis tube, slide the ruler toward the distal end of the internal jugular vein semi-permanent hemodialysis tube, align the zero scale line of the second scale line of the ruler with the proximal end of the double-lumen tube fixed wing of the internal jugular vein semi-permanent hemodialysis tube, and read the subcutaneous tunnel section length, which is the scale value of the second scale line of the ruler corresponding to the position of the second marking clip.

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