CN116870340B - Double-cavity cannula - Google Patents

Abstract

The invention provides a double-cavity cannula which comprises a drainage tube and a return tube, wherein the drainage tube is provided with a drainage cavity; the reflux pipe passes through the drainage tube and comprises a first reflux pipe section exposed at the distal end of the drainage tube, a second reflux pipe section arranged in the drainage cavity and a third reflux pipe section exposed at the proximal end of the drainage tube; the first backflow pipe section is in sealing connection with the drainage tube, the proximal end of the second backflow pipe section is in sealing connection with the third backflow pipe section, a fixed part and a free part are arranged on the circumference of the distal end of the second backflow pipe section, the fixed part is connected with the first backflow pipe section, and the free part is in a first state of being attached to the inner wall of the second backflow pipe section and a second state of being detached from the inner wall of the second backflow pipe section. The invention ensures that the drainage tube and the return tube have enough flow cross section area, and ensures the drainage and return effect.

Description

Double lumen cannula

Technical field

The present invention relates to the field of medical devices, and in particular to a double-lumen intubation tube.

Background technique

Intubation is a key component in the extracorporeal membrane oxygenation (ECMO) system that is directly connected to human blood vessels. It is a bridge connecting the ECMO extracorporeal circulation pipeline and human blood vessels, and plays a vital role in the normal function of the ECMO system. An ECMO system contains two cannulae, one cannula is used to draw venous blood from the human body, and the other cannula is used to return the arterial blood that has been oxygenated by the ECMO system back to the human body's blood vessels. The vein-to-vein cannulation method VV-ECMO is an intubation treatment method commonly used by the ECMO system for patients with pulmonary failure. Usually, a single-lumen cannula is used as a drainage tube and is inserted into the inferior vena cava after femoral vein puncture surgery. In the right atrium, venous blood is extracted from the inferior vena cava, oxygenated by the ECMO system, and inserted into the superior vena cava through the internal jugular vein through another single-lumen cannula, and the oxygenated arterial blood is returned to the human body. The existing VV-ECMO requires two intubations, and the cannulation surgery is performed on two different blood vessels through two puncture holes on the body surface. The operation is complex and will also increase the patient's risk of infection.

One solution is to use double-lumen intubation, insert the return tube into the drainage tube, and integrate the drainage tube for transporting venous blood and the return tube for transporting arterial blood into one, which only requires one intubation. Reduce the complexity of surgery and reduce trauma to the body surface and blood vessels. However, in double-lumen intubation, the drainage pipeline and the return pipeline occupy the same vascular route, and the cross-sectional area of the pipeline is limited. It is difficult to ensure that both the drainage pipeline and the return pipeline have sufficient cross-sectional area for flow. Ensure the drainage and return flow effect.

Contents of the invention

In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a double-lumen intubation tube so that both the drainage pipeline and the return pipeline have sufficient flow cross-sectional areas to ensure the drainage and reflux effect.

The present disclosure provides a dual-lumen intubation tube, including:

A drainage tube with a drainage cavity;

A return tube that passes through the drainage tube and includes a first return tube section exposed to the distal end of the drainage tube, a second return tube section built into the drainage cavity, and a third return tube section exposed to the proximal end of the drainage tube. ,

The first return pipe section is sealingly connected to the drainage pipe, the proximal end of the second return pipe section is sealingly connected to the third return pipe section, and the distal end of the second return pipe section has a fixed part and a free part in the circumferential direction. part, the fixed part is connected to the first return pipe section, and the free part has a first state that is close to the inner wall of the first return pipe section and a second state that is separated from the inner wall of the first return pipe section.

Optionally, the proportion of the fixed portion in the circumferential direction of the distal end of the second return pipe section is less than 1/2;

The proportion of the free portion in the circumferential direction of the distal end of the second return pipe section is greater than 1/2.

Optionally, the proximal end of the drainage tube is provided with a drainage joint, and the third return pipe section is provided with a return joint.

Optionally, the second return pipe section is a thin-walled deformable flexible pipe; the wall thickness of the second return pipe section is smaller than the wall thickness of the first return pipe section; the wall thickness of the second return pipe section is smaller than the wall thickness of the first return pipe section. The wall thickness of the drainage tube.

Optionally, there is a gap between the outer wall of the second return pipe section and the inner wall of the drainage pipe;

A drainage hole is provided on the side wall of the distal end of the drainage tube, and a reflux hole is provided on the side wall of the distal end of the first reflux tube section; after the intubation is completed, the drainage hole is located in the inferior vena cava and superior vena cava. or in the right atrium.

Optionally, a first through hole is provided at the distal end of the drainage tube, and the first return pipe section passes through the first through hole and is sealingly connected to the wall of the first through hole.

Optionally, the outer diameter of the first return pipe section is smaller than the outer diameter of the drainage pipe;

The outer wall of the first return pipe section and the outer wall of the drainage pipe have a smooth transition.

Optionally, the first return pipe section and the drainage pipe are integrally formed.

Optionally, a second through hole is provided on the side wall of the proximal end of the drainage tube, and the return tube extends through the second through hole toward the distal end of the drainage tube, and the drainage tube is connected to the The hole walls of the second through hole are sealed and connected.

Optionally, the angle between the second return pipe section and the third return pipe section is greater than 90°.

Optionally, the second return pipe section and the third return pipe section are integrally formed.

Optionally, a first support body is provided in the pipe wall of the first return pipe section; the first support body is used to expand the pipe wall of the first return pipe section and make the first return pipe section bendable. ;

The density of the first support body on the side of the first return pipe section away from the drainage pipe is smaller than the density of the first support body on the side close to the drainage pipe. One side of the tube is more flexible than the side closer to the drainage tube.

Optionally, the length of the return tube is greater than the length of the drainage tube. After intubation is completed, the return hole on the return tube is located in the left atrium, and the drainage hole of the drainage tube is located in the right atrium.

Implementing the above solution will have the following beneficial effects:

The double-lumen intubation provided by the present invention has both a drainage tube and a reflux tube. The drainage tube and the reflux tube are integrated into a single tube. When used, only one puncture hole is formed on the body surface. The risk of bleeding and infection is higher than conventional ones formed on the body surface. Two puncture holes are significantly lowered by the way.

On the return pipe, the second return pipe section is partially connected to the first return pipe section. When placing the pipe, the guide core penetrates the drainage pipe and the first return pipe section, squeezing the second return pipe section to one side, because the guide core does not need to pass through the second return pipe section. Return pipe section, so the second return pipe section does not need to adapt to the size of the guide core. Its diameter and wall thickness can be made smaller, reducing the occupation of the cross-sectional area of the drainage cavity and making the gap between the inner wall of the drainage pipe and the outer wall of the second return pipe section The flow cross-sectional area is larger. Because the blood pressure of arterial blood returned through the return tube is greater than the blood pressure of venous fluid drained through the drainage tube, even if the diameter of the second return tube section is made smaller, the return of arterial blood will not be hindered. The cross-sectional area of the drainage chamber of the present invention is Under certain circumstances, by reducing the cross-sectional proportion of the return tube in the drainage cavity, the flow area of venous blood drainage is expanded, so that both the drainage tube and the return tube have sufficient flow cross-sectional area to ensure the drainage and reflux effect.

Description of the drawings

Figure 1 is a front view of a double-lumen intubation provided by an embodiment of the present application;

Figure 2 is a right view of the double-lumen intubation provided by the embodiment of the present application;

Figure 3 is a cross-sectional view of a double-lumen intubation provided by an embodiment of the present application;

Figure 4 is a partial structural schematic diagram of the structure shown in Figure 3;

Figure 5 is a partial structural schematic diagram of the structure shown in Figure 3;

Figure 6 is an enlarged view of part A in Figure 5;

Figure 7 is a cross-sectional view of the guide core provided by the embodiment of the present application when it is inserted into the dual-lumen cannula;

Figure 8 is a cross-sectional view after the guide core is withdrawn from the dual-lumen intubation provided by the embodiment of the present application;

Figure 9 is a schematic structural diagram of a guide core provided by an embodiment of the present application.

In the picture:

100 drainage tube, 101 drainage chamber, 102 drainage joint, 104 drainage hole, 105 first through hole, 106 second through hole, 107 second support body, 108 drainage tube transition section,

200 return pipe, 201 first return pipe section, 202 second return pipe section, 203 third return pipe section, 204 fixed part, 205 free part, 206 return joint, 207 return hole, 208 first support body, 209 return pipe head end, 210 avoidance channel, 211 overflow channel,

300 guide core, 301 guide core through hole, 302 first guide core section, 303 second guide core section, 304 third guide core section, 305 fourth guide core section, 306 first snap-in part, 307 second snap-in connection Department, 308 docking channel;

400 guide wire.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, rather than all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Therefore, the following detailed description of the embodiments of the invention provided in the appended drawings is not intended to limit the scope of the claimed invention, but rather to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

It should be noted that similar reference numerals and letters represent similar items in the following figures, therefore, once an item is defined in one figure, it does not need further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or The positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is customarily placed when used. It is only for the convenience of describing the invention and simplifying the description, and does not indicate or imply the device referred to. Or elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations on the invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions and shall not be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise stated, "plurality" means two or more.

In the description of the present invention, it should also be noted that, unless otherwise clearly stated and limited, the terms "set" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection, or Integrally connected; either mechanically or electrically. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, unless otherwise expressly provided and limited, the term "above" or "below" a first feature of a second feature may include direct contact between the first and second features, or may also include the first and second features. Not in direct contact but through additional characteristic contact between them. Furthermore, the terms "above", "above" and "above" a first feature on a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is higher in level than the second feature. “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.

The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and cannot be understood as limiting the present invention.

This embodiment provides a dual-lumen intubation, please refer to Figures 1 to 8. The dual-lumen intubation includes a drainage tube 100 and a return tube 200. The drainage tube 100 has a drainage cavity 101 inside, and the return tube 200 passes through the drainage tube 100. The return pipe 200 includes a first return pipe section 201, a second return pipe section 202 and a third return pipe section 203. The first return pipe section 201 is exposed to the distal end of the drainage tube 100, and the third return pipe section 203 is exposed to the proximal end of the drainage tube 100. The second return pipe section 202 is built in the drainage cavity 101, and the two ends of the second return pipe section 202 are respectively connected to the third return pipe section 203 and the first return pipe section 201. The length of the return pipe 200 is greater than the length of the drainage pipe 100 . The proximal end of the drainage tube 100 is provided with a drainage joint 102, and the third return pipe section 203 is provided with a return joint 206. Referring to Figures 4 and 5, a drainage hole 104 is provided on the side wall of the distal end of the drainage tube 100, and a return hole 207 is provided on the side wall of the distal end of the first return pipe section 201. There is a gap between the outer wall of the second return pipe section 202 and the inner wall of the drainage tube 100 to allow the venous blood entering from the drainage hole 104 to flow to the drainage connector 102 through the gap.

It should be noted that the drainage hole 104 on the double-lumen cannula is used to lead the venous blood in the body out of the body, and the return hole 207 is used to return oxygen-rich arterial blood to the body. The positions of the drainage hole 104 and the return hole 207 can be determined according to the specific use. Design according to the location and body size, for example, changing the distance between the drainage hole 104 and the return hole 207 according to the distance between the predetermined position of the venous blood and the predetermined position of the returned arterial blood to ensure that the drainage hole 104 and the return hole 207 can accurately Delivered to designated location.

It should be noted that the drainage hole 104 of the double-lumen cannula is located in the inferior vena cava, the superior vena cava or the right atrium, and is used to suck venous blood into the drainage chamber 101 of the double-lumen cannula and lead it to the outside of the body, and then through the oxygenator Oxygenation and carbon dioxide removal are processed to form oxygen-rich arterial blood, which is finally directly infused into the left atrium by the centrifugal pump through the return joint 206, the third return pipe section 203, the second return pipe section 202 and the first return pipe section 201, which can reduce the burden on the heart and lungs. , for cardiopulmonary support. For example, after the intubation is completed, the return hole 207 on the return tube 200 is located in the left atrium, and the drainage hole 104 of the drainage tube 100 is located in the right atrium.

The first return pipe section 201 is sealingly connected to the drainage tube 100 , and the proximal end of the second return pipe section 202 is sealingly connected to the third return pipe section 203 . The second return pipe section 202 has a fixed part 204 and a free part 205 on the circumference of the distal end. The fixed part 204 is connected to the first return pipe section 201 and the free part 205 has a first state of fitting the inner wall of the first return pipe section 201 and a free part 205 . A second state of the inner wall of the return pipe section 201. When the free part 205 is in the first state, the first return pipe section 201, the second return pipe section 202 and the third return pipe section 203 are connected in sequence to form a flow passage 211 for draining arterial blood, as shown in Figure 8. When the free part is in the second state, an escape passage 210 is formed between the outer wall of the second return pipe section 202 and the inner wall of the first return pipe section 201, allowing the guide core 300 for delivering the dual-lumen cannula to pass, as shown in Figure 7 .

Specifically, the proportion of the fixed part 204 in the circumferential direction of the distal end of the second return pipe section 202 is less than 1/2, and the proportion of the free part 205 in the circumferential direction of the distal end of the second return pipe section 202 is greater than 1/2, so that It is ensured that after the free part 205 is deformed, there is a large enough channel between the outer wall of the second return pipe section 202 and the inner wall of the first return pipe section 201 for the guide core 300 to pass through. In one possible implementation, the proportion of the fixed part 204 in the circumferential direction of the distal end of the second return pipe section 202 is 1/3, and the proportion of the free part 205 in the circumferential direction of the distal end of the second return pipe section 202 is 2/3, the fixing part 204 is bonded to the inner wall of the second return pipe section 202.

The second return pipe section 202 is a thin-walled deformable flexible pipe, and the free part 205 of the second return pipe section 202 can approach the fixed part 204 after being squeezed by the guide core 300 . The wall thickness of the second return pipe section 202 is smaller than the wall thickness of the first return pipe section 201 ; the wall thickness of the second return pipe section 202 is smaller than the wall thickness of the drainage pipe 100 . A first support body 208 is provided in the wall of the first return pipe section 201. The first support body 208 is used to expand the pipe wall of the first return pipe section 201 and make the first return pipe section 201 bendable. A second support body 107 is provided in the wall of the drainage tube 100. The second support body 107 is used to expand the wall of the drainage tube 100 and make the drainage tube 100 bendable. The first support body 208 and the second support body 107 may be support bodies with a spiral structure or a mesh structure, such as support springs.

The first return tube section 201 and the drainage tube 100 are to be inserted into the body. The first return tube section 201 and the drainage tube 100 have certain support strength and flexibility, and can reach a predetermined position along the complete blood vessel pipeline. The second return pipe section 202 is built into the drainage cavity 101 and does not need to directly contact the blood vessel wall. In this embodiment, no support is provided in the second return pipe section 202. When the flow cross-sectional area is the same, the second return pipe section can be The wall of the tube 202 is made thin, reducing the cross-sectional proportion of the return tube 200 in the drainage chamber 101 and expanding the flow area of the venous blood drainage.

In a possible implementation, the density of the first support body 208 on the side of the first return pipe section 201 away from the drainage pipe 100 is smaller than the density of the first support body 208 on the side close to the drainage pipe 100. The first return pipe section 201 The flexibility of the side of 201 away from the drainage tube 100 is greater than the flexibility of the side close to the drainage tube 100 . In this embodiment, by adjusting the density of the second support body 107 at different positions on the second return pipe section 202, different positions of the second return pipe section 202 correspond to different bending strengths. The denser the second support body 107, the higher the bending strength. The bigger. Taking the second support body 107 as a spring as an example, relatively sparse springs are provided on the second return pipe section 202 at a position far away from the drainage pipe 100, and relatively dense springs are provided on the second return pipe section 202 at a position close to the drainage pipe 100, then The bending strength of the second return pipe section 202 on the side close to the drainage pipe 100 is greater than the bending strength of the second return pipe section 202 on the side away from the drainage pipe 100. In this way, the distal end of the second return pipe section 202 can be more flexible and reduce the risk of The distal end of the second reflux tube section 202 passes through the tricuspid valve and the pulmonary valve due to difficulty in placement.

Please refer to Figure 3. The outer diameter of the first return pipe section 201 is smaller than the outer diameter of the drainage tube 100. On the one hand, the first return pipe section 201 serves as the head end of the entire dual-lumen cannula, reducing the diameter of the first return pipe section 201. The outer diameter is conducive to its smooth passage in the blood vessel. At the same time, since the first return pipe section 201 is used to transport arterial blood, the pressure is relatively large when the arterial blood is transported. Even if the outer diameter is reduced and the inner diameter is reduced, the arterial blood can still be transported in the first reflux pipe section 201. The first return pipe section 201 flows smoothly; on the other hand, reducing the outer diameter of the first return pipe section 201 can also reduce the trauma to blood vessel walls, heart valves and other tissues during the insertion process.

The outer wall of the first return tube section 201 has a smooth transition with the outer wall of the drainage tube 100. There is no step surface at the junction of the distal end of the return tube 200 and the drainage tube 100, so the blood vessel wall will not be damaged when the cannula is inserted into the blood vessel.

In a possible implementation, the distal end of the drainage tube 100 is provided with a first through hole 105 , and the first return pipe section 201 passes through the first through hole 105 and is sealingly connected to the wall of the first through hole 105 . In another possible implementation, the first return pipe section 201 and the drainage pipe 100 are integrally formed.

Please refer to Figure 3. A second through hole 106 is also provided on the side wall of the proximal end of the drainage tube 100. The return tube 200 extends through the second through hole 106 to the distal end of the drainage tube 100. The drainage tube 100 and the second through hole 106 hole wall sealing connection. The angle between the second return pipe section 202 and the third return pipe section 203 is greater than 90°. In this embodiment, the return tube 200 is inclined at a certain angle and penetrates into the drainage chamber 101 to prevent blood from rapidly turning in the return tube 200 and causing damage to blood cells. Among them, the second return pipe section 202 and the third return pipe section 203 are integrally formed. Of course, the second return pipe section 202 and the third return pipe section 203 can also be formed separately and then sealed and connected.

The double-lumen intubation provided by the invention has both a drainage tube 100 and a return tube 200. The drainage tube 100 and the return tube 200 are integrated into a single tube. When used, only one puncture hole is formed on the body surface, and the risk of bleeding and infection is higher than that of conventional ones. The formation of two puncture holes on the body surface is significantly reduced.

On the return pipe 200, the second return pipe section 202 is partially connected to the first return pipe section 201. When placing the pipe, the guide core 300 penetrates the drainage pipe 100 and the first return pipe section 201, squeezing the second return pipe section 202 to one side. Since the guide core 300 does not need to pass through the second return pipe section 202, the second return pipe section 202 does not need to adapt to the size of the guide core 300, and its pipe diameter and wall thickness can be made smaller, reducing the cross-sectional area occupied by the drainage cavity 101, so that The flow cross-sectional area between the inner wall of the drainage pipe 100 and the outer wall of the second return pipe section 202 is larger. Because the blood pressure of arterial blood returned through the return tube 200 is greater than the blood pressure of venous fluid drained through the drainage tube 100, even if the diameter of the second return tube section 202 is made smaller, it will not hinder the return of arterial blood. The present invention is effective in drainage. When the cross-sectional area of the cavity 101 is constant, by reducing the cross-sectional proportion of the return pipe 200 in the drainage cavity 101, the flow area of the venous blood drainage is expanded, so that both the drainage pipe 100 and the return pipe 200 have sufficient flow cross-sectional areas. , to ensure the effect of drainage and return flow.

The double-lumen catheter provided in this embodiment uses a guide core to guide its insertion into the body. Please refer to Figure 9. The guide core 300 has a guide core through hole 301 that penetrates both ends of the guide core 300. The guide core through hole 301 is used to pass the guide wire 400. The guide core through hole 301 includes a butt joint. Channel 308, the diameter of the docking channel 308 matches the diameter of the guide wire 400. Optionally, the diameter of the docking channel 308 is slightly larger than the diameter of the guide wire 400 , or the diameter of the docking channel 308 is equal to the diameter of the guide wire 400 . The outer wall of the guide core 300 has a snap-in portion. When the guide core 300 is placed in the dual-lumen cannula, the snap-in portion is connected to the inner wall of the drainage chamber 101 and/or the first return flow. The inner wall of the pipe section 201 fits.

In a possible implementation, the guide core 300 includes a first guide core section 302, a second guide core section 303, a third guide core section 304 and a fourth guide core section 305 that are connected in sequence. The through hole 301 penetrates the first core guide segment 302 , the second core guide segment 303 , the third core guide segment 304 and the fourth core guide segment 305 . The outer diameter of the fourth guide core segment 305 is larger than the outer diameter of the second guide core segment 303 , and the outer diameter of the third guide core segment 304 approaches from the side close to the fourth guide core segment 305 One side of the second guide core section 303 gradually decreases, and the outer diameter of the first guide core section 302 is from the side close to the second guide core section 303 to the side away from the second guide core section 303 Taper off one side. The docking channel 308 is provided in the first guide core section. The latching part includes a first latching part 306 and a second latching part 307. The first latching part 306 is provided on the first guide core section 302, and the second latching part 307 is provided on on the third guide core section 304. For example, the first clamping part 306 may be located at a position on the first guide core segment 302 connected to the second guide core segment 303, and the second clamping part 307 may be located on the third guide core segment 302. The position on the guide core section 304 connected to the fourth guide core section 305.

In a possible implementation, the drainage tube includes a drainage tube transition section 108 , the drainage tube transition section 108 is connected to the first return pipe section 201 , and the outer diameter and inner diameter of the drainage tube transition section 108 They all gradually decrease from the side away from the first return pipe section 201 to the side close to the first return pipe section 201 . Referring to Figures 3 and 4, the side of the first return pipe section 201 away from the second return pipe section 202 has a return pipe head end 209, and the inner diameter of the return pipe head end 209 changes from close to the second return pipe section. One side of 202 gradually decreases toward the side away from the second return pipe section 202 . When the guide core 300 is inserted into the dual-lumen cannula, the first guide core section 302 partially extends out of the first return tube section 201, and the first clamping portion 306 fits the return tube head. The second clamping portion 307 fits the inner wall of the transition section of the drainage tube to position the guide core 300 in the dual-lumen cannula. It should be noted that the fitting surface between the guide core 300 and the double-lumen cannula should not be too large. If the fitting surface is too large, the friction between the double-lumen cannula and the guide core 300 will increase, which is not conducive to the guide core 300. Evacuate.

The insertion process of the cannula in this embodiment includes:

1. Pass the guide core 300 through the drainage joint 102, the drainage cavity 101 and the first return pipe section 201 in sequence. At this time, the guide core 300 squeezes the second return pipe section 303 to one side, and the first guide core section 302 of the guide core 300 is The front end passes through the first return pipe section 201, the first clamping portion 306 at the rear end of the first guide core section 302 fits the inner wall of the return pipe head end 209 on the first return pipe section 201, and the third guide core section 304 has The two clamping parts 307 are in contact with the inner wall of the drainage tube transition section 108 . The first guide core section 302 is located at the head end of the guide core 300, and the fourth guide core section 305 is located at the tail end of the guide core 300. When the guide core 300 moves in the direction pointed by the head end, the guide core 300 is always sleeved on both sides. The guide core 300 can exit the dual-lumen cannula when the guide core 300 moves in the direction pointed by the tail end.

2. Send the head end of the guide wire 400 to a designated location (such as the left atrium) along the blood vessel through the puncture hole on the body surface, and the tail end of the guide wire 400 is exposed outside the body surface.

3. Pass the tail end of the guide wire 400 through the first guide core section 302, the second guide core section 303, the third guide core section 304 and the fourth guide core section 305 of the guide core 300 in sequence, and the outer wall of the guide wire 400 is connected to The inner wall of the docking channel 308 is fitted, the front end of the guide wire 400 extends out of the first guide core section 302, and the tail end of the guide wire 400 extends out of the fourth guide core section 305.

4. Use the guide wire 400 to guide the guide core 300 and the double-lumen cannula into the blood vessel until the return hole 207 and the drainage hole 104 of the double-lumen cannula reach the designated position, and then remove the guide wire 400 and the guide core 300 from the double-lumen cannula. Withdraw and complete the placement of the double-lumen cannula.

When a double-lumen cannula is used to guide blood, since the blood pressure of the arterial blood returned to the body from the return tube 200 is much greater than the blood pressure of the venous blood flowing out of the drainage tube 100, the second return tube section 303 can be used in the arterial blood flow. The second return pipe 303 expands under impact so that the outer wall of the second return pipe 303 is in close contact with the inner wall of the first return pipe section 201 to form an arterial blood overflow channel 211 to ensure that the arterial blood flows smoothly from the return hole 207 .

Note that the above are only the preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the present invention The scope is determined by the scope of the appended claims.

Claims (13)

1. A double-lumen intubation tube, characterized by comprising: A drainage tube (100) has a drainage cavity (101); The return tube (200) passes through the drainage tube (100) and includes a first return tube section (201) exposed to the distal end of the drainage tube (100) and a second return tube section built into the drainage cavity (101). The pipe section (202) and the third return pipe section (203) exposed to the proximal end of the drainage pipe (100); The first return pipe section (201) is sealingly connected to the drainage pipe (100), the proximal end of the second return pipe section (202) is sealingly connected to the third return pipe section (203), and the second return pipe section (202) is sealingly connected to the third return pipe section (203). The distal end of the pipe section (202) has a fixed part (204) and a free part (205) on the circumference. The fixed part (204) is connected to the first return pipe section (201), and the free part (205) has The first state is close to the inner wall of the first return pipe section (201) and the second state is distanced from the inner wall of the first return pipe section (201). 2. The double-lumen cannula according to claim 1, characterized in that, The proportion of the fixed portion (204) in the circumferential direction of the distal end of the second return pipe section (202) is less than 1/2; The proportion of the free portion (205) in the circumferential direction of the distal end of the second return pipe section (202) is greater than 1/2. 3. The double-lumen cannula according to claim 1, characterized in that, The proximal end of the drainage tube (100) is provided with a drainage joint (102), and the third return pipe section (203) is provided with a return joint (206). 4. The double-lumen cannula according to claim 1, characterized in that, The second return pipe section (202) is a thin-walled deformable flexible pipe; the wall thickness of the second return pipe section (202) is smaller than the wall thickness of the first return pipe section (201); the second return pipe section (201) The wall thickness of 202) is smaller than the wall thickness of the drainage tube (100). 5. The double-lumen cannula according to claim 1, characterized in that, There is a gap between the outer wall of the second return pipe section (202) and the inner wall of the drainage pipe (100); A drainage hole (104) is provided on the side wall of the distal end of the drainage tube (100), and a return hole (207) is provided on the side wall of the distal end of the first return pipe section (201); after the intubation is completed, The drainage hole (104) is located in the inferior vena cava, superior vena cava or right atrium. 6. The double-lumen cannula according to claim 1, characterized in that, The distal end of the drainage tube (100) is provided with a first through hole (105), and the first return pipe section (201) passes through the first through hole (105) and is connected with the first through hole (105). ) hole wall sealing connection. 7. The double-lumen cannula according to claim 1, characterized in that, The outer diameter of the first return pipe section (201) is smaller than the outer diameter of the drainage pipe (100); The outer wall of the first return pipe section (201) and the outer wall of the drainage pipe (100) have a smooth transition. 8. The double-lumen cannula according to claim 7, characterized in that, The first return pipe section (201) and the drainage pipe (100) are integrally formed. 9. The double-lumen cannula according to claim 1, characterized in that, A second through hole (106) is provided on the side wall of the proximal end of the drainage tube (100), and the return tube (200) passes through the second through hole (106) toward the end of the drainage tube (100). The distal end extends, and the drainage tube (100) is sealingly connected to the hole wall of the second through hole (106). 10. The double-lumen cannula according to claim 9, characterized in that, The angle between the second return pipe section (202) and the third return pipe section (203) is greater than 90°. 11. The double-lumen cannula according to claim 1, characterized in that, The second return pipe section (202) and the third return pipe section (203) are integrally formed. 12. The double-lumen cannula according to claim 1, characterized in that, A first support body (208) is provided in the pipe wall of the first return pipe section (201); the first support body (208) is used to open the pipe wall of the first return pipe section (201) and make it The first return pipe section (201) is bendable; The density of the first support body (208) on the side of the first return pipe section (201) away from the drainage pipe (100) is smaller than the density of the first support body (208) on the side close to the drainage pipe (100). ) density, the flexibility of the side of the first return pipe section (201) away from the drainage tube (100) is greater than the flexibility of the side close to the drainage tube (100). 13. The double-lumen cannula according to claim 4, characterized in that, The length of the return tube (200) is greater than the length of the drainage tube (100). After intubation is completed, the return hole (207) on the return tube (200) is located in the left atrium, and the drainage tube (100) The drainage hole (104) of 100) is located in the right atrium.