Catheter assembly for interventional operation and display method

Abstract

The invention discloses a catheter assembly for interventional operation, which comprises a tube seat provided with an operation channel and an injection channel; the tube body is provided with a tube cavity, the near end of the tube body is connected with the tube base so that the tube cavity can be communicated with the operation channel, and a flow channel is formed in the tube wall of the tube body and communicated with the injection channel; a cavity is formed in the inner wall of the end cap, the end cap is connected with the far end of the pipe body, so that the flow channel is communicated with the cavity, a plurality of hole sites are formed in the outer wall of the end cap, and the hole sites are communicated with the cavity; the invention further discloses a display method. A bypass injection mode is adopted, the injection channel is arranged in the tube seat, the flow channel is arranged in the tube body and the cavity is arranged in the end cap to form a bypass, and a contrast agent injected by the bypass is slightly released from the hole site in the end cap so as to be continuously distributed around the advancing end cap, so that an image is kept clear and uninterrupted during intubation, and the contrast agent can be accurately injected. And uninterrupted precise intubation operation is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a catheter assembly and a display method for interventional surgery. Background Art

[0002] Interventional surgery is an interventional treatment inside the human body under the guidance of medical imaging equipment, such as guidewires, catheters and other components. The catheter is a component used for interventional operations in interventional surgery, such as inserting stents in blood vessels and injecting embolic agents.

[0003] The catheter intubation operation mainly relies on medical imaging and guidewire guidance. During the insertion of the guidewire, contrast agents are required to improve the clarity of blood vessels. When inserting the catheter, the concentration of the contrast agent decreases as the operation time increases, resulting in reduced blood vessel clarity, which is not conducive to catheter insertion. However, the commonly used catheter components are usually single-channel catheters. In order to improve the clarity of blood vessels, contrast agents are usually injected from the catheter lumen to obtain clear images. Although this method can increase the concentration of contrast agents in blood vessels, it is difficult to control the diffusion amount of contrast agents during the injection process because the catheter tube mouth is forward and the catheter tube mouth has a large diameter. The injected contrast agent is distributed in the blood vessels in front of the catheter and is difficult to distribute in the blood vessels around the end of the catheter. It is necessary to carefully observe the position and status of the catheter in batches, resulting in the need for intermittent injections and intubation, that is, it is difficult to obtain uninterrupted clear images to achieve uninterrupted and accurate intubation.

[0004] Therefore, the existing single-channel catheter assembly adopts a method of pushing the contrast agent forward through the catheter tube orifice. Because the tube orifice is too large, the contrast agent needs to be pushed in several times to control the amount, so as to obtain uninterrupted clear images and realize uninterrupted and accurate intubation. Summary of the invention

[0005] The purpose of the present invention is to provide a catheter assembly and display method for interventional surgery, so as to solve the technical problem in the prior art that the single-channel catheter assembly has a large tube orifice, which requires the contrast agent to be injected in batches and controlled in amount, so as to obtain uninterrupted clear images and realize uninterrupted precise intubation.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] A catheter assembly for interventional surgery, comprising:

[0008] A tube base, wherein the tube base has an operation channel and an injection channel;

[0009] A tube body, wherein the tube body has a tube lumen, the proximal end of the tube body is connected to the tube seat so that the tube lumen is connected to the operation channel, a flow channel is arranged inside the tube wall of the tube body, and the flow channel is connected to the injection channel;

[0010] An end cap, wherein the inner wall of the end cap has a chamber, the end cap is connected to the distal end of the tube body so that the flow channel is connected to the chamber, and a plurality of holes are arranged on the outer wall of the end cap, the holes are connected to the chamber;

[0011] The injection channel is used to inject contrast agent. After the contrast agent is injected into the injection channel, the flow channel guides the contrast agent into the chamber and injects it into the blood vessels from the multiple holes to be distributed around the end cap.

[0012] As a preferred solution of the present invention, a first annular groove is provided at the connecting end of the tube seat and the tube body, the proximal end of the tube body is inserted into the first annular groove for fixing and leaving a first gap, the injection channel is connected to the first gap, and the flow channel passes through the proximal end of the tube body and is connected to the first gap;

[0013] The number of the flow channels is one or more.

[0014] As a preferred solution of the present invention, the tube body comprises an inner tube and an outer tube, the tube cavity is formed on the inner wall of the inner tube, and a woven mesh is provided between the inner tube and the outer tube;

[0015] A film is arranged between the braided mesh and the outer tube, the film is attached to the outer surface of the braided mesh, and the flow channel is located between the film and the outer tube.

[0016] As a preferred solution of the present invention, a groove extending along the axial direction is formed on the inner wall of the outer tube, the film is attached to the inner part of the outer tube, and the film closes the opening of the groove to form the flow channel;

[0017] Wherein, a convex strip is formed on the outer wall of the film, the convex strip is integrally formed with the film, and the convex strip is clamped at the notch of the channel for sealing.

[0018] As a preferred solution of the present invention, a diaphragm is arranged inside the hole, and a cross cut is arranged on the diaphragm, and the cross cut opens when the pressure in the chamber is greater than the pressure outside the diaphragm.

[0019] As a preferred solution of the present invention, the multiple holes on the end cap are evenly distributed at the front end and the circumference of the end cap, the holes located at the front end of the end cap face the front of the end cap, and the holes located at the circumference of the end cap face the rear of the end cap.

[0020] As a preferred solution of the present invention, a metal ring is provided at the connection between the end cap and the tube body, the metal ring is a soft metal foil, and the metal ring is embedded in the outer surface of the end cap.

[0021] As a preferred solution of the present invention, an injection nozzle is provided on the outer side wall of the tube seat, and the injection nozzle is connected to the injection channel;

[0022] Wherein, a one-way valve core is arranged inside the injection nozzle.

[0023] As a preferred solution of the present invention, a second annular groove is provided at the connecting end of the end cap and the tube body, the distal end of the tube body is inserted into the second annular groove and fixed with a second gap, one or more holes are provided in the second annular groove, and the holes communicate with the second gap and the chamber;

[0024] Wherein, the flow channel passes through the distal end of the tube body and is connected to the second gap.

[0025] In order to solve the above technical problems, the present invention further provides the following technical solutions:

[0026] A display method using the above-mentioned catheter assembly for interventional surgery comprises the following steps:

[0027] Step 100, inserting the end cap and the tube body of the catheter into the blood vessel along the guide wire, and performing radiographic imaging of the blood vessel using an imaging instrument to observe the position status of the end cap and the tube body in the blood vessel;

[0028] Step 200, before inserting the operating tube body, injecting contrast agent into the injection channel at a set flow rate;

[0029] Step 300: The contrast agent enters the chamber along the flow channel and flows out from the hole to the blood around the end cap. As the tube body is inserted and the end cap moves forward, the contrast agent is always released in trace amounts and distributed around the end cap. Radiological imaging is observed and uninterrupted intubation operations are performed.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention adopts a bypass injection method, by setting an injection channel in the tube seat, a flow channel in the tube body and a chamber in the end cap to form a bypass, and the bypass injection contrast agent is released in a trace amount from the holes on the end cap to be continuously distributed around the moving end cap, thereby keeping the image clear and uninterrupted during the intubation process and realizing uninterrupted and precise intubation operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0033] Figure 1 A schematic diagram of the structure of a catheter assembly for interventional surgery provided by an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the structure of the injection channel portion of a catheter assembly for interventional surgery provided by an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of the structure of a tube body portion of a catheter assembly for interventional surgery provided by an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of the structure of a flow channel portion of a catheter assembly for interventional surgery provided by an embodiment of the present invention;

[0037] Figure 5 A schematic diagram of the structure of a tube seat portion of a catheter assembly for interventional surgery provided by an embodiment of the present invention;

[0038] Figure 6 A schematic diagram of the structure of an end cap portion of a catheter assembly for interventional surgery provided by an embodiment of the present invention;

[0039] Figure 7 A schematic diagram of the structure of the diaphragm portion of a catheter assembly for interventional surgery provided by an embodiment of the present invention.

[0040] The numbers in the figure represent the following:

[0041] 1-Pipe seat; 2-Pipe body; 3-End cap;

[0042] 11-operation channel; 12-injection channel; 13-first annular groove; 14-injection nozzle; 21-inner tube; 22-outer tube; 23-woven mesh; 24-flow channel; 31-chamber; 32-hole position; 33-metal ring; 34-second annular groove;

[0043] 131 - first gap; 141 - one-way valve core; 211 - lumen; 221 - groove; 231 - film; 232 - convex strip; 321 - diaphragm; 322 - cross cut; 341 - second gap; 342 - hole. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] like Figure 1-3and Figure 5-6 As shown, the present invention provides a catheter assembly for interventional surgery, comprising:

[0046] A tube base 1, the tube base 1 is provided with an operation channel 11 and an injection channel 12;

[0047] The tube body 2 has a tube cavity 211. The proximal end of the tube body 2 is connected to the tube seat 1, so that the tube cavity 211 is connected to the operation channel 11. The tube wall of the tube body 2 is provided with a flow channel 24, and the flow channel 24 is connected to the injection channel 12.

[0048] The end cap 3 has a chamber 31 in its inner wall, and the end cap 3 is connected to the distal end of the tube body 2 so that the flow channel 24 is connected to the chamber 31. The outer wall of the end cap 3 is provided with a plurality of holes 32, and the holes 32 are connected to the chamber 31.

[0049] The injection channel 12 is used to inject contrast agent. After the contrast agent is injected into the injection channel 12 , the flow channel 24 guides the contrast agent into the chamber 31 and injects it into the blood vessels from the multiple holes 32 to be distributed around the end cap 3 .

[0050] The catheter assembly of this embodiment mainly utilizes the injection channel 12, the flow channel 24, the chamber 31 and the hole 32 to form a channel in the catheter assembly composed of the tube seat 1, the tube body 2 and the end cap 3. This channel is used to inject contrast agent, so that after the catheter assembly is inserted into the blood vessel, the contrast agent is injected into the blood vessel along the injection channel 12, the flow channel 24, the chamber 31 and the hole 32 and distributed around the end cap 3, thereby increasing the concentration of contrast agent in the blood around the end cap 3, so as to improve the clarity of radiological imaging, thereby more clearly observing the position of the end cap in the blood vessel and improving the accuracy of the operation.

[0051] Compared with the existing catheter assembly that uses a large-scale contrast agent injection method in the catheter lumen, the catheter assembly of this embodiment uses a bypass injection method to inject the contrast agent from the injection channel 12 of the tube seat 1 through the flow channel 24 of the tube body 2 to the chamber 31 of the end cap 3, and then diffuses it around the end cap through multiple holes 32, forming a bypass injection to make the blood vessels around the end cap 3 clear, thereby obtaining uninterrupted clear images and enabling uninterrupted and accurate intubation.

[0052] Since the injection channel 12 of the tube seat 1 needs to be connected to the flow channel 24 in the tube body 2, based on this, the following preferred embodiments are provided.

[0053] like Figure 5 As shown, the connecting end of the tube seat 1 and the tube body 2 is provided with a first annular groove 13, the proximal end of the tube body 2 is inserted into the first annular groove 13 and fixed with a first gap 131, the injection channel 12 is connected to the first gap 131, and the flow channel 24 passes through the proximal end of the tube body 2 and is connected to the first gap 131;

[0054] The number of the flow channels 24 is one or more.

[0055] Specifically, the proximal end of the tube body 2 has a protrusion, and the tube body 2 is inserted into the first annular groove 13 of the tube seat 1 and connected and fixed through this protrusion, and a first gap 131 is formed between the bottom of the first annular groove 13 and the protrusion of the tube body 2, and the injection channel 12 and the flow channel 24 are both connected to the first gap 131, so that the injection channel 12 is connected to the flow channel 34.

[0056] Similarly, since the flow channel 24 in the tube body 2 needs to be connected to the chamber 31 in the end cap 3, based on this, the following preferred embodiments are provided.

[0057] like Figure 6 As shown, a second annular groove 34 is provided at the connecting end of the end cap 3 and the tube body 2, the distal end of the tube body 2 is inserted into the second annular groove 34 and fixed with a second gap 341, one or more holes 342 are provided in the second annular groove 34, and the holes 342 communicate with the second gap 341 and the chamber 31;

[0058] The flow channel 24 passes through the distal end of the tube body 2 and communicates with the second gap 341 .

[0059] Specifically, the distal end of the tube body 2 has a protrusion, and the tube body 2 is inserted into the second annular groove 34 of the end cap 3 through the protrusion to be connected and fixed, and a second gap 341 is formed between the bottom of the second annular groove 34 and the protrusion of the tube body 2, and the chamber 31 is connected to the second gap 341 through the hole 342, and the flow channel 24 is also connected to the second gap 341, so that the flow channel 24 is connected to the chamber 31.

[0060] In addition, the proximal end of the tube body 2 is inserted into the first annular groove 13 through the protruding portion, and the distal end of the tube body 2 is also inserted into the second annular groove 34 through the protruding portion, which effectively increases the connection contact area, thereby effectively improving the sealing between the tube seat 1 and the tube body 2 and the sealing between the tube body 2 and the end cap 3.

[0061] The tube body 2 is usually required to have a certain torque transmission capability so that it can rotate in the blood vessel to adjust the direction of the end cap 3. Based on this, the following preferred embodiments are provided.

[0062] like Figure 3 As shown, the tube body 2 includes an inner tube 21 and an outer tube 22, a tube cavity 211 is formed on the inner wall of the inner tube 21, and a braided mesh 23 is provided between the inner tube 21 and the outer tube 22;

[0063] A film 231 is disposed between the braided mesh 23 and the outer tube 22 . The film 231 is attached to the outer surface of the braided mesh 23 , and the flow channel 24 is located between the film 231 and the outer tube 22 .

[0064] Specifically, in order to improve the torque transmission capability of the tube body 2, a braided mesh 23 is provided between the inner tube 21 and the outer tube 22, and the flow channel 24 is also located between the inner tube 21 and the outer tube 22. The braided mesh 23 is usually made of metal, so in order to prevent the braided mesh 23 from being corroded by the contrast agent, a film 231 is provided on the braided mesh 23 for protection, so that the flow channel 24 is located between the film 231 and the outer tube 22.

[0065] Of course, the flow channel 24 cannot affect the tight connection between the film 231 and the outer tube 22, so that the film 231 and the outer tube 22 are not separated. Based on this, the following preferred embodiments are provided.

[0066] like Figure 3 , Figure 4 As shown, a groove 221 extending along the axial direction is formed on the inner wall of the outer tube 22, and a film 231 is attached to the inner part of the outer tube 22, and the film 231 closes the opening of the groove 221 to form a flow channel 24;

[0067] A convex strip 232 is formed on the outer wall of the film 231 . The convex strip 232 and the film 231 are integrally formed. The convex strip 232 is clamped at the notch of the groove 221 to seal.

[0068] Specifically, the flow channel 24 is composed of a groove 221 and a film 231 arranged on the inner wall of the outer tube 22, and the film 231 has a convex strip 232 at the groove 221, and the convex strip 232 is inserted into the groove of the groove 221 to form a seal, so that the pressure in the flow channel 24 does not affect the tightness of the fit between the film 231 and the outer tube 22.

[0069] In addition, during the process of contrast agent being injected into the blood vessel, stopping the injection of contrast agent may cause the blood in the blood vessel to flow back into the chamber 31 and mix, thereby causing the contrast agent to gradually diffuse and contaminate the source. Based on this, the following preferred embodiments are provided.

[0070] like Figure 7 As shown, a diaphragm 321 is disposed inside the hole 32 , and a cross cut 322 is disposed on the diaphragm 321 . The cross cut 322 opens when the pressure in the chamber 31 is greater than the pressure outside the diaphragm 321 .

[0071] Specifically, the hole 32 is blocked by the diaphragm 321, and the cross cut 322 set on the diaphragm 321 can be opened after a pressure difference occurs, and the contrast agent is injected into the chamber 31 to increase the internal pressure. Therefore, when the pressure in the chamber 31 is greater than a certain value of the pressure in the blood vessel, the cross cut 322 is opened, allowing the contrast agent to enter the blood vessel.

[0072] When the injection is stopped, the pressure in the chamber 31 no longer increases, but the interior is filled with contrast agent and still has a certain pressure. Therefore, it is difficult for the blood in the blood vessel to open the cross incision 322, thereby making it difficult for the blood in the chamber 31 to contaminate the contrast agent.

[0073] Of course, in order to further avoid blood backflow, such as Figure 1 , Figure 5 As shown, an injection nozzle 14 is provided on the outer wall of the tube base 1, and the injection nozzle 14 is connected to the injection channel 12;

[0074] A one-way valve core 141 is disposed inside the injection nozzle 14 .

[0075] Specifically, the one-way valve core 141 is used to limit the backflow of the contrast agent injected into the injection channel 12, and the one-way valve core 141 cooperates with the diaphragm 321 to form a sealed channel among the injection channel 12, the flow channel 24 and the chamber 31, which has a certain internal pressure after being filled with the injected contrast agent, thereby effectively preventing blood from entering the interior of the channel, and reducing the probability of blood backflow and contaminating the contrast agent.

[0076] Based on the above embodiments, the hole 32 can diffuse the contrast agent in the blood vessels around the end cap 3. Therefore, in order to enable the contrast agent to better surround the end cap 3 to improve the image clarity around the end cap 3, the following preferred embodiments are provided.

[0077] like Figure 6 As shown, the multiple holes 32 on the end cap 3 are evenly distributed at the front end and the circumference of the end cap 3 , the holes 32 located at the front end of the end cap 3 face the front of the end cap 3 , and the holes 32 located at the circumference of the end cap 3 face the rear of the end cap 3 .

[0078] Specifically, the hole positions 32 are divided into backward and forward directions, and the contrast agent in the chamber 31 is distributed in front and behind the end cap 3 after diffusing through the hole positions 32, so that the forward vascular path and the backward vascular path can be clearly observed.

[0079] Of course, after the contrast agent concentration around the end cap 3 is increased, the contrast between the end cap 3 and the blood image is relatively small, which may lead to insufficient clarity through the end cap 3. Based on this, the following preferred embodiments are provided.

[0080] like Figure 6 As shown, a metal ring 33 is provided at the connection between the end cap 3 and the tube body 2 . The metal ring 33 is a soft metal foil and is embedded in the outer surface of the end cap 3 .

[0081] Specifically, a metal ring 33 is provided on the end cap 3, and the imaging instrument usually adopts X-ray transmission. The metal ring 33 can be clearly presented on the image of the imaging instrument to improve the contrast between the end cap 3 and the blood contrast agent, so that both the end cap 3 and the blood vessel can be clearly observed, thereby improving the accuracy of the operation.

[0082] Based on the above-mentioned catheter assembly for interventional surgery, a display method is provided below, comprising the following steps:

[0083] Step 100, inserting the end cap and the tube body of the catheter into the blood vessel along the guide wire, and performing radiographic imaging of the blood vessel using an imaging instrument to observe the position status of the end cap and the tube body in the blood vessel;

[0084] Step 200, before inserting the operating tube body, injecting contrast agent into the injection channel at a set flow rate;

[0085] Step 300: The contrast agent enters the chamber along the flow channel and flows out from the hole to the blood around the end cap. As the tube body is inserted and the end cap moves forward, the contrast agent is always released in trace amounts and distributed around the end cap. Radiological imaging is observed and uninterrupted intubation operations are performed.

[0086] In this display method, after the end cap is inserted into the blood vessel along the guide wire, the blood vessel is radiographed using an imaging instrument, so that the position and status of the end cap and the tube body in the blood vessel can be observed. Before the tube body is delivered, a contrast agent is first injected through the injection channel at a fixed flow rate, so that the contrast agent diffuses from the hole position around the end cap, thereby making the blood vessels around the end cap clearer under the imaging instrument, and facilitating uninterrupted and precise control of the delivery of the tube body and the end cap.

[0087] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A catheter assembly for interventional surgery, characterized in that: include: A tube base (1), wherein the tube base (1) is provided with an operation channel (11) and an injection channel (12); A tube body (2), the tube body (2) having a tube lumen (211), the proximal end of the tube body (2) being connected to the tube seat (1), so that the tube lumen (211) is connected to the operation channel (11), a flow channel (24) is provided inside the tube wall of the tube body (2), and the flow channel (24) is connected to the injection channel (12); An end cap (3), wherein the inner wall of the end cap (3) is provided with a chamber (31), the end cap (3) is connected to the distal end of the tube body (2), so that the flow channel (24) is connected to the chamber (31), and a plurality of holes (32) are arranged on the outer wall of the end cap (3), and the holes (32) are connected to the chamber (31); The injection channel (12) is used to inject contrast agent, and after the contrast agent is injected into the injection channel (12), the flow channel (24) guides the contrast agent into the chamber (31) and injects it into the blood vessels from the plurality of holes (32) to be distributed around the end cap (3).

2. A catheter assembly for interventional surgery according to claim 1, characterized in that: A first annular groove (13) is provided at the connecting end of the tube seat (1) and the tube body (2); the proximal end of the tube body (2) is inserted into the first annular groove (13) and fixed therein, leaving a first gap (131); the injection channel (12) is connected to the first gap (131); and the flow channel (24) passes through the proximal end of the tube body (2) and is connected to the first gap (131); There are one or more flow channels (24).

3. A catheter assembly for interventional surgery according to claim 2, characterized in that: The tube body (2) comprises an inner tube (21) and an outer tube (22); the tube cavity (211) is formed on the inner wall of the inner tube (21); and a woven mesh (23) is provided between the inner tube (21) and the outer tube (22); A film (231) is provided between the woven mesh (23) and the outer tube (22); the film (231) is attached to the outer surface of the woven mesh (23), and the flow channel (24) is located between the film (231) and the outer tube (22).

4. A catheter assembly for interventional surgery according to claim 3, characterized in that: A groove (221) extending along the axial direction of the outer tube (22) is formed on the inner wall of the outer tube (22); the film (231) is arranged in contact with the inside of the outer tube (22), and the film (231) closes the opening of the groove (221) to form the flow channel (24); A convex strip (232) is formed on the outer wall of the film (231), the convex strip (232) and the film (231) are integrally formed, and the convex strip (232) is clamped at the notch of the channel (221) for sealing.

5. A catheter assembly for interventional surgery according to claim 4, characterized in that: A diaphragm (321) is arranged inside the hole (32), and a cross cutout (322) is arranged on the diaphragm (321), and the cross cutout (322) opens when the pressure inside the chamber (31) is greater than the pressure outside the diaphragm (321).

6. A catheter assembly for interventional surgery according to any one of claims 1 to 5, characterized in that: The plurality of hole positions (32) on the end cap (3) are evenly distributed at the front end and the peripheral side of the end cap (3); the hole positions (32) located at the front end of the end cap (3) face the front of the end cap (3), and the hole positions (32) located at the peripheral side of the end cap (3) face the rear of the end cap (3).

7. A catheter assembly for interventional surgery according to claim 6, characterized in that: A metal ring (33) is provided at the connection between the end cap (3) and the tube body (2); the metal ring (33) is a soft metal foil and is embedded in the outer surface of the end cap (3).

8. The catheter assembly for interventional surgery according to claim 2, characterized in that: An injection nozzle (14) is provided on the outer side wall of the tube seat (1), and the injection nozzle (14) is connected to the injection channel (12); Wherein, a one-way valve core (141) is arranged inside the injection nozzle (14).

9. A catheter assembly for interventional surgery according to claim 8, characterized in that: A second annular groove (34) is provided at the connecting end of the end cap (3) and the tube body (2); the distal end of the tube body (2) is inserted into the second annular groove (34) and fixed therein, leaving a second gap (341); one or more holes (342) are provided in the second annular groove (34); the holes (342) communicate with the second gap (341) and the chamber (31); Wherein, the flow channel (24) passes through the distal end of the tube body (2) and is connected to the second gap (341).

10. A method for displaying a catheter assembly for interventional surgery according to any one of claims 1 to 9, characterized in that: The steps include: Step 100, inserting the end cap and the tube body of the catheter into the blood vessel along the guide wire, and performing radiographic imaging of the blood vessel using an imaging instrument to observe the position status of the end cap and the tube body in the blood vessel; Step 200, before inserting the operating tube body, injecting contrast agent into the injection channel at a set flow rate; Step 300: The contrast agent enters the chamber along the flow channel and flows out from the hole to the blood around the end cap. As the tube body is inserted and the end cap moves forward, the contrast agent is always released in trace amounts and distributed around the end cap. Radiological imaging is observed and uninterrupted intubation operations are performed.

Images