Single-tube double-cavity catheter

Abstract

The single-tube double-cavity catheter comprises an input cavity tube and a drainage cavity tube, the input cavity tube comprises an input outer tube and an input inner tube, the head end of the input outer tube is provided with an opening, the input outer tube is provided with a plurality of input side holes, the input side holes are close to the head end of the input outer tube, and the drainage cavity tube is provided with a drainage cavity. The tail end of the input outer pipe is communicated with the input inner pipe; the drainage cavity tube surrounds the periphery of the input inner tube, the input outer tube is located outside the drainage cavity tube, the connecting position of the drainage cavity tube and the input outer tube and the connecting position of the drainage cavity tube and the input inner tube are closed, a plurality of sets of drainage side holes are formed in the drainage cavity tube, and the drainage efficiency of the drainage cavity tube and the input efficiency of the input cavity tube are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of catheter, especially a single tube double cavity catheter. BACKGROUND

[0002] For the patients with right heart failure and respiratory failure who are invalid for traditional treatment methods (drugs, respirators, CRRT, etc.), extracorporeal life support is needed to further check, diagnose and implement follow-up treatment methods.

[0003] The current right heart failure auxiliary method includes V-A ECMO and V-PA auxiliary circulation. V-A ECMO is a whole heart auxiliary device, which cannot directly assist the right ventricle, and must be connected with a membrane lung. The most commonly used V-PA auxiliary circulation needs to be inserted through bilateral femoral veins, and there are two cannulas in the right atrium and inferior vena cava.

[0004] The traditional respiratory failure auxiliary circulation method needs to be double-cannulated through the internal jugular vein and the femoral vein, and blood convection is easy to occur, which leads to recirculation and affects the auxiliary effect, and increases the infection and bleeding probability. Therefore, the publication number CN107684659A discloses a double-cavity cannula, which has only one puncture point, effectively reducing the damage to the patient's tissue. The existing cannula has low use efficiency and limited use scene. UTILITY MODEL CONTENT

[0005] The utility model aims at the deficiency in the prior art, and provides a single tube double cavity auxiliary circulation catheter which effectively improves the use efficiency.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A single tube double cavity catheter, comprising:

[0008] An input cavity tube, the input cavity tube comprises an input outer tube and an input inner tube, an opening is formed at the head end of the input outer tube, a plurality of input side holes are formed on the input outer tube, the input side holes are close to the head end of the input outer tube, and the tail end of the input outer tube is in communication with the input inner tube.

[0009] A drainage cavity tube, the drainage cavity tube surrounds the periphery of the input inner tube, the input outer tube is located outside the drainage cavity tube, the connection part of the drainage cavity tube, the input outer tube and the input inner tube is closed, and a plurality of groups of drainage side holes are formed on the drainage cavity tube.

[0010] As a preferred embodiment, the plurality of input side holes are divided into a plurality of circles along the length direction of the input outer tube, the number of input side holes in each circle is a plurality, and the input side holes in adjacent two circles are arranged in a staggered manner.

[0011] As a preferred embodiment, the plurality of drainage side holes are divided into a first group of drainage side holes and a second group of drainage side holes along the length direction of the drainage lumen tube, the second group of drainage side holes is arranged away from the head end of the input outer tube relative to the first group of drainage side holes, and the first group of drainage side holes and the second group of drainage side holes each include a plurality of turns of drainage side holes, the turns of drainage side holes are arranged at intervals along the length direction of the drainage lumen tube, the number of turns of drainage side holes in each group is a plurality, and the turns of drainage side holes are arranged at intervals along the circumferential direction of the drainage lumen tube.

[0012] As a preferred embodiment, the spacing between the first group of drainage side holes and the second group of drainage side holes is greater than the spacing between adjacent turns of drainage side holes in each group.

[0013] As a preferred embodiment, adjacent turns of drainage side holes are staggered.

[0014] As a preferred embodiment, the sum of the cross-sectional areas of all the drainage side holes is greater than the cross-sectional area of the drainage lumen tube.

[0015] As a preferred embodiment, the edges of the input side hole and the drainage side hole are respectively provided with a marker point.

[0016] As a preferred embodiment, a wire mesh is arranged in the input lumen tube and the drainage lumen tube, respectively.

[0017] As a preferred embodiment, the technical scheme further comprises:

[0018] An input tail tube in communication with the tail end of the input inner tube, the input tail tube and the input inner tube being coaxial;

[0019] A drainage tail tube in communication with the tail end of the drainage lumen tube, and the drainage tail tube being arranged obliquely relative to the input tail tube.

[0020] As a preferred embodiment, the technical scheme further comprises:

[0021] A guide core penetrating the input outer tube and the input inner tube, and the tip of the guide core extending beyond the head end of the input outer tube, the inside of the guide core being used for guiding a wire to pass through.

[0022] Compared with the prior art, the technical scheme has the following advantages:

[0023] The input lumen is used for delivering blood to the pulmonary artery trunk, the drainage lumen is used for draining blood of the vena cava, the right atrium and the right ventricle, the drainage side holes are divided into groups, one group of drainage side holes drains blood of the right ventricle, another group of drainage side holes drains blood in the vena cava and the right atrium, the drainage lumen surrounds the periphery of the input inner tube of the input lumen, the drainage cavity defined between the drainage lumen and the input inner tube surrounds the periphery of the input inner tube, and a plurality of drainage side holes are arranged in the circumferential direction of the drainage lumen, so as to ensure the drainage efficiency of the drainage lumen, and the input outer tube is arranged outside the drainage lumen, thereby improving the use efficiency.

[0024] The utility model is further illustrated below in combination with the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic view of the single-tube double-lumen catheter of the utility model;

[0026] Figure 2 It is a structural schematic view of the head end of the input outer tube of the utility model;

[0027] Figure 3 It is a structural schematic view of the drainage lumen of the utility model;

[0028] Figure 4 It is a structural schematic view of the wire mesh of the utility model;

[0029] Figure 5 It is an assembly schematic view of the single-tube double-lumen catheter, the guide core and the guide wire of the utility model;

[0030] Figure 6 And Figure 7 It is a use schematic view of the single-tube double-lumen catheter of the utility model.

[0031] In the drawing: 100 input lumen, 110 input outer tube, 111 opening, 112 input side hole, 120 input inner tube, 200 drainage lumen, 210 drainage side hole, 210a first group of drainage side holes, 210b second group of drainage side holes, 300 mark point, 400 wire mesh, 500 input tail tube, 600 drainage tail tube, 700 guide core, 800 guide wire. DETAILED DESCRIPTION

[0032] The following description is used to disclose the utility model so that those skilled in the art can realize the utility model. The preferred embodiments in the following description are only as examples, and other obvious modifications can be thought of by those skilled in the art. The basic principles of the utility model defined in the following description can be applied to other implementation schemes, modification schemes, improvement schemes, equivalent schemes and other technical schemes without departing from the spirit and scope of the utility model.

[0033] As Figures 1 to 3 shown, the single-tube double-lumen catheter comprises:

[0034] an input lumen 100, the input lumen 100 comprising an input outer tube 110 and an input inner tube 120, the input outer tube 110 having an opening 111 at a head end, the input outer tube 110 having a plurality of input side holes 112, the input side holes 112 being close to the head end of the input outer tube 110, the tail end of the input outer tube 110 being in communication with the input inner tube 120;

[0035] a drainage lumen 200, the drainage lumen 200 surrounding the periphery of the input inner tube 120, the input outer tube 110 being located outside the drainage lumen 200, the drainage lumen 200 being closed at the connection with the input outer tube 110 and the input inner tube 120, the drainage lumen 200 having a plurality of groups of drainage side holes 210.

[0036] The input lumen 100 is used to deliver blood to the main trunk of the pulmonary artery, the drainage lumen 200 is used to drain blood from the vena cava, the right atrium and the right ventricle, the drainage side holes 210 are divided into groups, one group of drainage side holes 210 drains blood from the right ventricle, another group of drainage side holes 210 drains blood from the vena cava and the right atrium, and the drainage lumen 200 surrounds the periphery of the input inner tube 120 of the input lumen 100, the drainage lumen 200 and the input inner tube 120 define a drainage lumen that surrounds the periphery of the input inner tube 120, and the drainage lumen 200 has a plurality of drainage side holes 210 in the circumferential direction, which ensures the drainage efficiency of the drainage lumen 200, and the input outer tube 110 remains outside the drainage lumen 200, which is reasonably arranged to improve the use efficiency.

[0037] As Figure 1 shown, the input outer tube 110 and the input inner tube 120 are integrally connected and in communication with each other, wherein the head end of the input outer tube 110 is located in the main trunk of the pulmonary artery, the tail end of the input inner tube 120 can be located outside the body and connected to drive the blood pump through an external pipeline, so that blood is delivered to the input outer tube 110 through the input inner tube 120, and enters the main trunk of the pulmonary artery through the opening 111 and the input side holes 112 of the front segment of the input outer tube 110.

[0038] Referring to Figure 1 and Figure 2The plurality of input side holes 112 are divided into multiple turns along the length direction of the input outer tube 110, the number of input side holes 112 in each turn is multiple, and the input side holes 112 in adjacent turns are arranged at intervals along the circumferential direction of the input outer tube 110, and the input side holes 112 in adjacent turns are arranged staggered, which effectively improves the blood delivery efficiency compared with the single side hole.

[0039] In the embodiment, the input side holes 112 are two turns, and the number of input side holes 112 in each turn is two, and the input side holes 112 in one turn are located between the two input side holes 112 in the other turn, thereby forming the input side holes 112 in adjacent turns arranged staggered.

[0040] The input side holes 112 in adjacent turns are close to each other, so that the input side holes 112 can be arranged concentratedly in the front section of the input outer tube 110 to deliver blood to the main trunk of the pulmonary artery.

[0041] As preferred, the edge of the input side hole 112 is provided with a mark point 300 for facilitating display under X-ray.

[0042] As shown in Figure 1 The length of the drainage lumen tube 200 is much smaller than the length of the input lumen tube 100, so that the input inner tube 120 of the input lumen tube 100 is located inside the drainage lumen tube 200, and the input outer tube 110 of the input lumen tube 100 is located outside the drainage lumen tube 200, so that the delivery lumen in the input lumen tube 100 is completely separated from the drainage lumen defined between the drainage lumen tube 200 and the input inner tube 120, so that the delivered blood and the drained blood do not contact each other.

[0043] The drainage lumen tube 200 and the input inner tube 120 are coaxial, the input outer tube 110 is coaxially extended from the input inner tube 120, and the input outer tube 110 can be made of flexible material, such as plastic.

[0044] As shown in Figure 1 and Figure 3 The plurality of groups of drainage side holes 210 are divided into a first group of drainage side holes 210a and a second group of drainage side holes 210b along the length direction of the drainage lumen tube 200, the second group of drainage side holes 210b is arranged away from the head end of the input outer tube 110 relative to the first group of drainage side holes 210a, and the first group of drainage side holes 210a and the second group of drainage side holes 210b each include multiple turns of drainage side holes, the multiple turns of drainage side holes are arranged at intervals along the length direction of the drainage lumen tube 200, and the number of drainage side holes in each turn is multiple and arranged at intervals along the circumferential direction of the drainage lumen tube 200.

[0045] The first group of drainage side holes 210a and the second group of drainage side holes 210b are closely arranged, and the distance between the first group of drainage side holes 210a and the second group of drainage side holes 210b is greater than the distance between two adjacent circles of drainage side holes in each group. This is because the first group of drainage side holes 210a and the second group of drainage side holes 210b are spaced apart, which can avoid the tricuspid valve leaflets.

[0046] The first group of drainage side holes 210a drains blood from the right ventricle, and the second group of drainage side holes 210b drains blood in the vena cava and right atrium.

[0047] In this embodiment, the first group of drainage side holes 210a has four circles of drainage side holes 210, each circle having four drainage side holes 210, and each circle of drainage side holes 210 of the first group of drainage side holes 210a is closely arranged. The second group of drainage side holes 210b has six circles of drainage side holes 210, each circle having four drainage side holes 210, and each circle of drainage side holes 210 of the second group of drainage side holes 210b is closely arranged.

[0048] Further, two adjacent circles of drainage side holes 210 are arranged staggered. Compared with the single side hole of the prior art, the multi-side hole design effectively drains, even if an individual side hole is adsorbed by the heart tissue, it does not affect the reflux.

[0049] Reference Figure 3 The edges of the drainage side holes 210 are respectively provided with mark points 300, which are convenient for display under X-ray.

[0050] As preferred, the sum of the cross-sectional areas of all the drainage side holes 210 is greater than the cross-sectional area of the drainage lumen tube 200. This reduces the occurrence of adverse pressure drop in the drainage lumen tube 200, so as to ensure the flow in the drainage lumen tube 200 and the efficiency of the drainage lumen tube.

[0051] As shown in Figure 1 and Figure 4 The delivery lumen in the input lumen tube 100 is completely separated from the drainage lumen defined between the drainage lumen tube 200 and the input inner tube 120. The input lumen tube 100 and the drainage lumen tube 200 are respectively provided with a wire mesh 400, which reduces the deformation of the lumen.

[0052] Further, the input lumen tube 100 and the drainage lumen tube 200 are made of medical materials and can be manufactured by dipping, extrusion, co-molding and other manufacturing processes, and the wire mesh 400 in the tube wall is supported by metal, the wire mesh 400 can be in a spiral shape, and the side holes are supported by metal wires around the side holes to prevent the side holes from collapsing.

[0053] As shown in Figure 1 The single-tube double-lumen catheter further comprises:

[0054] an input tail tube 500, which communicates with the tail end of the input inner tube 120, the input tail tube 500 and the input inner tube 120 being coaxial;

[0055] a drainage tail tube 600, which communicates with the tail end of the drainage lumen tube 200, and the drainage tail tube 600 is arranged obliquely relative to the input tail tube 500.

[0056] The input lumen tube 100 is connected to an external pipeline through the input tail tube 500. The drainage lumen tube 200 is connected to an external pipeline through the drainage tail tube 600, and since the drainage tail tube 600 is arranged obliquely relative to the input tail tube 500, the external pipeline is connected to the blood pump.

[0057] As shown in Figure 5 the single-tube double-lumen catheter further comprises:

[0058] a guide core 700, which is arranged through the input outer tube 110 and the input inner tube 120, and the tip of the guide core 700 is arranged outside the head end of the input outer tube 110, and the inside of the guide core 700 is used for the guide wire 800 to pass through.

[0059] The tip of the guide core 700 is arranged to facilitate insertion into the patient's body, and the tip of the guide core 700 can be made of medical-grade material and has a certain hardness, but not too hard to prevent damage to the patient's tissue.

[0060] The maximum diameter of the guide wire 800 is 0.038 inches (0.965 mm), and the length is 200 cm. The guide wire 800 is preferably inserted into the pulmonary artery branch to prevent the guide wire from slipping into the right ventricle when the pulmonary artery floating catheter is withdrawn.

[0061] Heparin is given before the catheter is inserted. This operation is usually carried out in specific medical procedures, such as hemodialysis, extracorporeal circulation, etc. ACT (Activated Clotting Time) is maintained at 180-200 s, which can ensure the anticoagulation effect while reducing the risk of bleeding. However, the ACT value and bleeding of the patient need to be closely monitored during use, and the anticoagulation scheme needs to be adjusted according to the specific situation of the patient and the requirements of the medical procedure.

[0062] X-ray and transesophageal echocardiography are required for the placement of the catheter. X-ray can be provided by a C-arm machine or a digital subtraction angiography X-ray machine, etc. The method for using the single-tube double-lumen auxiliary circulation catheter is as follows:

[0063] First step, puncture femoral vein under ultrasound guidance, left and right femoral vein, right femoral vein is better. After puncture, indwelling vascular sheath, through the vascular sheath to place the guide wire 800, can use X-ray and esophageal heart ultrasound to confirm the position of the guide wire 800, reference Figure 6 .

[0064] Generally, the guide wire 800 can smoothly enter the pulmonary artery branch (left and right pulmonary artery). If the guide wire is not placed smoothly, the pulmonary artery floating catheter can be placed through the vascular sheath, and the floating catheter is confirmed to enter the pulmonary artery branch through pressure monitoring, esophageal heart ultrasound and X-ray. The guide wire is placed along the pulmonary artery floating catheter, and the esophageal heart ultrasound and X-ray are used to confirm that the guide wire enters the pulmonary artery branch, and the pulmonary artery floating catheter is withdrawn. The percutaneous dilatation sheath is placed along the guide wire, and the skin and subcutaneous tissue are fully expanded, and attention is paid to pressing the skin entrance to reduce bleeding. After expansion, the esophageal heart ultrasound and X-ray are used to confirm that the guide wire is in the pulmonary artery branch.

[0065] Second step, flush the catheter and guide core 700 with normal saline. Insert the guide core 700 into the input chamber of the catheter to become a combination, reference Figure 5 .

[0066] Third step, place the flushed and assembled catheter and guide core combination along the guide wire, and use esophageal heart ultrasound and X-ray to confirm that the catheter enters the main trunk of the pulmonary artery. Attention should be paid to that the guide core 700 should not be inserted too deep to avoid damaging the blood vessels and tissues of the patient. After confirming the position of the catheter, withdraw the guide core 700 and the guide wire 800, and pay attention to the backflow of blood in the catheter. Fix the catheter on the skin of the patient, connect the blood pump and or membrane lung after the catheter lumen is exhausted, and implement mechanical assistance.

[0067] Fourth step, use X-ray to expose the marker point 300 to confirm the position of each side hole to ensure that the front end of the input outer tube 110 is located in the main trunk of the pulmonary artery, and the drainage side hole 210 of the drainage lumen tube 200 is located in the right ventricle and right atrium, respectively, reference Figure 7 .

[0068] According to the needs, determine the connection mode of the catheter. If only right heart assistance is needed, only the blood pump needs to be connected. If respiratory assistance is needed, an oxygenator also needs to be used. It can also be combined with other assisted circulation.

[0069] In summary, the catheter is specially designed for right heart assistance and respiratory assistance, overcomes the defects of current auxiliary circulation, and fills the domestic blank in the field. The catheter adopts a single tube double cavity design, the input cavity tube 100 is an input cavity, and the drainage cavity tube 200 is a drainage cavity between the input cavity tube 100 and the drainage cavity tube 200. The front opening 111 of the input cavity tube 100 and the input side hole 112 can input blood into the main trunk of the pulmonary artery. Two groups of drainage side holes 210 are arranged on the drainage cavity tube 200, which respectively drain the blood of the vena cava, the right atrium and the right ventricle. The catheter can be connected with a blood pump to drive the blood flow. In the respiratory support, a membrane lung can be connected in series, that is, ECMO. The designed catheter has the advantages of single tube catheterization, direct right heart assistance and direct respiratory assistance, and has the advantages of simple structure and convenient operation.

[0070] The above-described embodiments are only used to illustrate the technical ideas and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot be limited to the patent application range of the present application only by the above-described embodiments, that is, any equivalent changes or modifications made according to the spirit disclosed by the present application still fall within the patent range of the present application.

Claims

1. A single-tube double-lumen catheter, characterized in that, include: An input cavity tube (100) is provided, comprising an input outer tube (110) and an input inner tube (120). The input outer tube (110) has an opening (111) at its head end and multiple input side holes (112) on it. The input side holes (112) are located near the head end of the input outer tube (110), and the tail end of the input outer tube (110) is connected to the input inner tube (120). A drainage cavity (200) surrounds the inner input tube (120), and an outer input tube (110) is located outside the drainage cavity (200). The drainage cavity (200) is closed at the connection between the outer input tube (110) and the inner input tube (120). The drainage cavity (200) has multiple sets of drainage side holes (210).

2. The single-tube double-lumen catheter as described in claim 1, characterized in that, The plurality of input side holes (112) are divided into multiple rings along the length direction of the input outer tube (110). Each ring has a plurality of input side holes (112) and they are spaced apart along the circumference of the input outer tube (110). The input side holes (112) of adjacent rings are staggered.

3. The single-tube double-lumen catheter as described in claim 1, characterized in that, The multiple sets of drainage side holes (210) are divided into a first set of drainage side holes (210a) and a second set of drainage side holes (210b) along the length direction of the drainage cavity (200). The second set of drainage side holes (210b) is located away from the head end of the input outer tube (110) relative to the first set of drainage side holes (210a). The first set of drainage side holes (210a) and the second set of drainage side holes (210b) each include multiple rings of drainage side holes. The multiple rings of drainage side holes are spaced apart along the length direction of the drainage cavity (200). The number of drainage side holes in each ring is multiple, and they are spaced apart along the circumferential direction of the drainage cavity (200).

4. The single-tube double-lumen catheter as described in claim 3, characterized in that, The distance between the first group of drainage side holes (210a) and the second group of drainage side holes (210b) is greater than the distance between two adjacent rings of drainage side holes in each group.

5. The single-tube double-lumen catheter as described in claim 3, characterized in that, The drainage side holes (210) of two adjacent rings are staggered.

6. The single-tube double-lumen catheter as described in claim 3, characterized in that, The sum of the cross-sectional areas of all the drainage side holes (210) is greater than the cross-sectional area of ​​the drainage cavity (200).

7. The single-tube double-lumen catheter as described in claim 1, characterized in that, Marking points (300) are respectively provided on the edges of the input side hole (112) and the drainage side hole (210).

8. The single-tube double-lumen catheter as described in claim 1, characterized in that, The inlet cavity (100) and the drainage cavity (200) are respectively provided with wire mesh (400).

9. The single-tube double-lumen catheter as described in claim 1, characterized in that, Also includes: An input tail tube (500) is connected to the tail end of the input inner tube (120), and the input tail tube (500) and the input inner tube (120) are coaxial; A drainage tail tube (600) is connected to the tail end of the drainage cavity tube (200), and the drainage tail tube (600) is inclined relative to the input tail tube (500).

10. The single-tube double-lumen catheter as described in claim 1, characterized in that, Also includes: A guide core (700) passes through the input outer tube (110) and the input inner tube (120), and the tip of the guide core (700) extends beyond the head end of the input outer tube (110). The interior of the guide core (700) is used for the passage of the guide wire (800).

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