CN116870340B - Double-cavity cannula - Google Patents
Double-cavity cannula Download PDFInfo
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- CN116870340B CN116870340B CN202311085113.1A CN202311085113A CN116870340B CN 116870340 B CN116870340 B CN 116870340B CN 202311085113 A CN202311085113 A CN 202311085113A CN 116870340 B CN116870340 B CN 116870340B
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- tube
- drainage
- section
- backflow
- return
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- 238000010992 reflux Methods 0.000 claims abstract description 55
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 230000009977 dual effect Effects 0.000 claims description 20
- 230000007704 transition Effects 0.000 claims description 9
- 210000005245 right atrium Anatomy 0.000 claims description 7
- 210000005246 left atrium Anatomy 0.000 claims description 5
- 210000001631 vena cava inferior Anatomy 0.000 claims description 5
- 238000002627 tracheal intubation Methods 0.000 claims description 4
- 210000002620 vena cava superior Anatomy 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 210000004369 blood Anatomy 0.000 description 32
- 239000008280 blood Substances 0.000 description 32
- 210000004204 blood vessel Anatomy 0.000 description 7
- 230000036772 blood pressure Effects 0.000 description 6
- 210000001503 joint Anatomy 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 208000015181 infectious disease Diseases 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003032 molecular docking Methods 0.000 description 3
- 238000006213 oxygenation reaction Methods 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000002792 vascular Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 208000032843 Hemorrhage Diseases 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 208000034158 bleeding Diseases 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 230000002612 cardiopulmonary effect Effects 0.000 description 2
- 238000002618 extracorporeal membrane oxygenation Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000008733 trauma Effects 0.000 description 2
- 241001631457 Cannula Species 0.000 description 1
- 210000000601 blood cell Anatomy 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000003191 femoral vein Anatomy 0.000 description 1
- 210000003709 heart valve Anatomy 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 210000004731 jugular vein Anatomy 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002685 pulmonary effect Effects 0.000 description 1
- 210000003102 pulmonary valve Anatomy 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 201000004193 respiratory failure Diseases 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 210000000591 tricuspid valve Anatomy 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
- A61M1/3621—Extra-corporeal blood circuits
- A61M1/367—Circuit parts not covered by the preceding subgroups of group A61M1/3621
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
- A61M25/0068—Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
- A61M25/007—Side holes, e.g. their profiles or arrangements; Provisions to keep side holes unblocked
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/09—Guide wires
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/09—Guide wires
- A61M2025/09175—Guide wires having specific characteristics at the distal tip
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
Technical Field
The invention relates to the field of medical instruments, in particular to a double-cavity cannula.
Background
The intubation tube is a key component in an extracorporeal membrane pulmonary oxygenation (ECMO) system, is directly connected with a human blood vessel, is a bridge for connecting an ECMO extracorporeal circulation pipeline and the human blood vessel, and plays a vital role in normal function of the ECMO system. One ECMO system contains two cannulas, one cannula is for drawing venous blood from the human body and one cannula is for returning arterial blood after oxygenation by the ECMO system to the human body vessel. Vein-to-vein catheterization VV-ECMO is a catheterization method of ECMO systems commonly used for patients with pulmonary failure, and generally uses a single-lumen catheterization as a drainage tube, and inserts the single-lumen catheterization into the right atrium adjacent to the inferior vena cava after femoral vein puncture operation, withdraws venous blood from the inferior vena cava, and inserts the single-lumen catheterization into the superior vena cava through the internal jugular vein after oxygenation of the ECMO system, and returns the oxygenated arterial blood to the human body. The existing VV-ECMO needs to be cannulated twice, and a catheterization operation is performed on two different blood vessels through two body surface puncture holes, so that the operation complexity is high, and the infection risk of a patient is increased.
The solution idea is to use a double-cavity cannula, penetrate a return pipe into a drainage tube, integrate a drainage pipeline for conveying venous blood and a return pipe for conveying arterial blood, only need one cannula, reduce the complexity of operation, and reduce body surface and vascular trauma. However, in the double-cavity cannula, the drainage pipeline and the loop pipeline occupy the same blood pipeline, the cross-sectional area of the pipeline is limited, the drainage pipeline and the return pipeline are difficult to have enough flow cross-sectional areas, and the drainage and return effects cannot be guaranteed.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a double-cavity cannula, so that the drainage pipeline and the reflux pipeline have enough flow cross-section area, and the drainage reflux effect is ensured.
The present disclosure provides a dual lumen cannula comprising:
a drainage tube with a drainage cavity;
a return tube passing through the drainage tube and comprising a first return tube section exposed at the distal end of the drainage tube, a second return tube section arranged in the drainage cavity and a third return tube 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 first backflow pipe section and a second state of being detached from the inner wall of the first backflow pipe section.
Optionally, the fixed portion has a duty cycle of less than 1/2 in a circumferential direction of the distal end of the second return tube segment;
the free portion has a duty cycle of greater than 1/2 in a circumferential direction of the distal end of the second return tube segment.
Optionally, a drainage connector is arranged at the proximal end of the drainage tube, and a reflux connector is arranged on the third reflux tube section.
Optionally, the second backflow pipe section is a thin-wall 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 drainage pipe.
Optionally, a gap is formed between the outer wall of the second backflow pipe section and the inner wall of the drainage pipe;
a drainage hole is formed in the side wall of the distal end of the drainage tube, and a backflow hole is formed in the side wall of the distal end of the first backflow tube section; after cannula is completed, the drainage holes are located in the inferior vena cava, superior vena cava or right atrium.
Optionally, a first through hole is formed at the distal end of the drainage tube, and the first backflow tube section passes through the first through hole and is in sealing connection with the hole wall of the first through hole.
Optionally, the outer diameter of the first backflow pipe section is smaller than the outer diameter of the drainage pipe;
the outer wall of the first backflow pipe section is in smooth transition with the outer wall of the drainage pipe.
Optionally, the first backflow pipe section and the drainage pipe are integrally formed.
Optionally, a second through hole is formed in the side wall of the proximal end of the drainage tube, the return tube penetrates through the second through hole and extends towards the distal end of the drainage tube, and the drainage tube is in sealing connection with the hole wall of the second through hole.
Optionally, an included angle between the second backflow pipe section and the third backflow pipe section is greater than 90 °.
Optionally, the second backflow pipe section and the third backflow pipe section are integrally formed.
Optionally, a first supporting body is arranged in the pipe wall of the first backflow pipe section; the first support body is used for expanding the pipe wall of the first backflow pipe section and enabling the first backflow pipe section to be bendable;
the density of the first supporting body on the side, far away from the drainage tube, of the first backflow tube section is smaller than that of the first supporting body on the side, close to the drainage tube, of the first supporting body, and the flexibility of the side, far away from the drainage tube, of the first backflow tube section is larger than that of the side, close to the drainage tube, of the first backflow tube section.
Optionally, the length of the reflux pipe is greater than that of the drainage tube, after the intubation is completed, the reflux hole on the reflux pipe is positioned in the left atrium, and the drainage hole of the drainage tube is positioned in the right atrium.
By implementing the scheme, the method has the following beneficial effects:
the double-cavity cannula provided by the invention is provided with the drainage tube and the return tube, the drainage tube and the return tube are integrated into a whole to form a single tube, and when the double-cavity cannula is used, only one puncture hole is formed in the body surface, so that the risk of bleeding infection is obviously reduced compared with the conventional mode of forming two puncture holes in the body surface.
On the back flow, the second reflux pipe section is connected with first reflux pipe section part, when putting the pipe, leads the core to penetrate drainage tube and first reflux pipe section, extrudes the second reflux pipe section in one side, because the core need not pass through the second reflux pipe section, so the second reflux pipe section need not adapt to lead the core size, and its pipe diameter and wall thickness can both be made littleer, reduce and occupy drainage cavity cross-sectional area, make the cross-sectional area that overflows between drainage tube inner wall and the second reflux pipe section outer wall bigger. Because the blood pressure of the arterial blood returned by the reflux tube is larger than the blood pressure of the venous fluid drained by the drainage tube, the arterial blood return is not hindered even if the tube diameter of the second reflux tube section is made small.
Drawings
FIG. 1 is a front view of a dual lumen cannula provided in an embodiment of the present application;
FIG. 2 is a right side view of a dual lumen cannula provided by an embodiment of the present application;
FIG. 3 is a cross-sectional view of a dual lumen cannula provided in an embodiment of the present application;
FIG. 4 is a partial schematic view of the structure shown in FIG. 3;
FIG. 5 is a partial schematic view of the structure shown in FIG. 3;
fig. 6 is an enlarged view of a portion a in fig. 5;
FIG. 7 is a cross-sectional view of a guide core provided in an embodiment of the present application as it is being placed into a dual lumen cannula;
FIG. 8 is a cross-sectional view of a guide core provided in an embodiment of the present application after withdrawal of a dual lumen cannula;
fig. 9 is a schematic structural diagram of a guide core according to an embodiment of the present application.
In the figure:
100 drainage tubes, 101 drainage cavities, 102 drainage connectors, 104 drainage holes, 105 first through holes, 106 second through holes, 107 second supporting bodies, 108 drainage tube transition sections,
200 return pipe, 201 first return pipe section, 202 second return pipe section, 203 third return pipe section, 204 fixed portion, 205 free portion, 206 return joint, 207 return hole, 208 first support, 209 return pipe head end, 210 back-off channel, 211 through-flow channel,
300 guide cores, 301 guide core through holes, 302 first guide core sections, 303 second guide core sections, 304 third guide core sections, 305 fourth guide core sections, 306 first clamping parts, 307 second clamping parts and 308 butt joint channels;
400 guide wire.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
1-8, the dual-lumen cannula comprises a drainage tube 100 and a return tube 200, a drainage cavity 101 is formed in the drainage tube 100, the return tube 200 penetrates through the drainage tube 100, the return tube 200 comprises a first return tube section 201, a second return tube section 202 and a third return tube section 203, the first return tube section 201 is exposed to the distal end of the drainage tube 100, the third return tube section 203 is exposed to the proximal end of the drainage tube 100, the second return tube section 202 is arranged in the drainage cavity 101, and two ends of the second return tube section 202 are respectively butted with the third return tube section 203 and the first return tube section 201. The length of return tube 200 is greater than the length of drain tube 100. The proximal end of the drain tube 100 is provided with a drain connector 102 and the third return tube segment 203 is provided with a return connector 206. Referring to fig. 4 and 5, drainage apertures 104 are provided in the distal sidewall of the drainage tube 100 and a return aperture 207 is provided in the distal sidewall of the first return tube segment 201. A space is left between the outer wall of the second return tube segment 202 and the inner wall of the drain tube 100, allowing venous blood entering from the drain hole 104 to flow through the space to the drain connector 102.
It should be noted that, the drainage hole 104 on the dual-cavity cannula is used for guiding in-vivo venous blood out of the body, the backflow hole 207 is used for backflow of oxygen-enriched arterial blood into the body, the positions of the drainage hole 104 and the backflow hole 207 can be designed according to specific use positions and physical sizes, for example, according to the distance between the preset position of venous blood and the preset position of backflow arterial blood, the distance between the drainage hole 104 and the backflow hole 207 is changed, and the drainage hole 104 and the backflow hole 207 can be ensured to be accurately conveyed to the designated positions.
It should be noted that, the drainage hole 104 of the dual-cavity cannula is located in the inferior vena cava, superior vena cava or right atrium, and is used for sucking venous blood into the drainage cavity 101 of the dual-cavity cannula and leading to the outside of the body, then oxidizing and removing carbon dioxide by the oxygenator to form oxygen-enriched arterial blood, and finally directly filling the arterial blood into the left atrium by the centrifugal pump through the reflux joint 206, the third reflux tube segment 203, the second reflux tube segment 202 and the first reflux tube segment 201 in sequence, so as to reduce the cardiopulmonary burden and be used for cardiopulmonary support. Illustratively, after catheterization is completed, the return port 207 on the return tube 200 is located in the left atrium and the drain port 104 of the drain tube 100 is located in the right atrium.
Wherein the first reflux tube segment 201 is sealingly connected to the drain tube 100 and the proximal end of the second reflux tube segment 202 is sealingly connected to the third reflux tube segment 203. The distal end of the second return tube segment 202 has a fixed portion 204 and a free portion 205 in the circumferential direction, the fixed portion 204 being connected to the first return tube segment 201, the free portion 205 having a first state of abutting against the inner wall of the first return tube segment 201 and a second state of being separated from the inner wall of the first return tube segment 201. When the free portion 205 is in the first state, the first reflux tube segment 201, the second reflux tube segment 202, and the third reflux tube segment 203 are sequentially communicated to form a flow passage 211 for draining arterial blood, as shown in fig. 8. In the second state of the free portion, a bypass channel 210 is formed between the outer wall of the second reflux tube segment 202 and the inner wall of the first reflux tube segment 201, allowing passage of a guidewire 300 for delivering a double lumen cannula, as shown in fig. 7.
Specifically, the fixed portion 204 has a ratio of less than 1/2 in the circumferential direction of the distal end of the second return tube segment 202, and the free portion 205 has a ratio of greater than 1/2 in the circumferential direction of the distal end of the second return tube segment 202, so as to ensure that there is a sufficiently large passage between the outer wall of the second return tube segment 202 and the inner wall of the first return tube segment 201 for the catheter 300 to pass through after the deformation of the free portion 205. In one possible implementation, the fixed portion 204 has a 1/3 ratio in the circumferential direction of the distal end of the second backflow pipe section 202, the free portion 205 has a 2/3 ratio in the circumferential direction of the distal end of the second backflow pipe section 202, and the fixed portion 204 is bonded to the inner wall of the second backflow pipe section 202.
The second return tube segment 202 is a thin-walled flexible tube, and the free portion 205 of the second return tube segment 202 can be moved toward the fixed portion 204 after being extruded 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 tube segment 202 is less than the wall thickness of the draft tube 100. The first support 208 is disposed in the pipe wall of the first backflow pipe section 201, and the first support 208 is used for expanding the pipe wall of the first backflow pipe section 201 and enabling the first backflow pipe section 201 to be bendable. A second supporting body 107 is arranged in the tube wall of the drainage tube 100, and the second supporting body 107 is used for expanding the tube wall of the drainage tube 100 and enabling the drainage tube 100 to be bendable. The first supporting body 208 and the second supporting body 107 may be supporting bodies of a spiral structure or a mesh structure, such as supporting springs.
The first reflux tube section 201 and the drainage tube 100 are to be placed in the body, and the first reflux tube section 201 and the drainage tube 100 have a certain supporting strength and flexibility, and can reach a predetermined position along the complete vascular line. The second backflow pipe section 202 is built in the drainage cavity 101, and is not required to be in direct contact with the vessel wall, in this embodiment, a support body is not arranged in the second backflow pipe section 202, and under the condition that the area of the overflowing cross section is the same, the wall of the second backflow pipe section 202 can be thinned, the cross section ratio of the backflow pipe 200 in the drainage cavity 101 is reduced, and the overflowing area of venous blood drainage is enlarged.
In one possible implementation, the density of the first support 208 on the side of the first return tube segment 201 remote from the draft tube 100 is less than the density of the first support 208 on the side proximate to the draft tube 100, and the flexibility of the side of the first return tube segment 201 remote from the draft tube 100 is greater than the flexibility of the side proximate to the draft tube 100. In this embodiment, by adjusting the degree of the density of the second support 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, and the denser the second support 107, the greater the bending strength. Taking the second supporting body 107 as an example of a spring, a sparse spring is arranged at a position, far away from the drainage tube 100, on the second backflow tube section 202, and a dense spring is arranged at a position, close to the drainage tube 100, on the second backflow tube section 202, so that the bending strength of one side, close to the drainage tube 100, on the second backflow tube section 202 is greater than that of one side, far away from the drainage tube 100, on the second backflow tube section 202, and the distal flexibility of the second backflow tube section 202 is better, and the placement difficulty of the distal end of the second backflow tube section 202 penetrating through the tricuspid valve and the pulmonary valve is reduced.
Referring to fig. 3, the outer diameter of the first backflow pipe section 201 is smaller than that of the drainage tube 100, on one hand, the first backflow pipe section 201 is used as the head end part of the whole double-cavity cannula, so that the outer diameter of the first backflow pipe section 201 is reduced, smooth passage in a blood vessel is facilitated, meanwhile, as the first backflow pipe section 201 is used for conveying arterial blood, the pressure is high during arterial blood conveying, and even if the outer diameter of the first backflow pipe section is reduced by small, arterial blood can smoothly flow in the first backflow pipe section 201; on the other hand, reducing the outer diameter of the first return tube segment 201 may also reduce trauma to tissue such as the vessel wall and heart valve during insertion.
The outer wall of the first reflux tube section 201 is in smooth transition with the outer wall of the drainage tube 100, the joint of the reflux tube 200 and the distal end of the drainage tube 100 has no step surface, and the vascular wall is not damaged when the intubation tube is placed into a blood vessel.
In one possible implementation, the distal end of the draft tube 100 is provided with a first through bore 105, and the first return tube segment 201 passes through the first through bore 105 and is sealingly connected to the bore wall of the first through bore 105. In another possible implementation, the first return tube segment 201 is integrally formed with the draft tube 100.
Referring to fig. 3, a second through hole 106 is further provided on a side wall of the proximal end of the drainage tube 100, and the return tube 200 extends to the distal end of the drainage tube 100 through the second through hole 106, and the drainage tube 100 is connected with the wall of the second through hole 106 in a sealing manner. The angle between the second return leg 202 and the third return leg 203 is greater than 90. In this embodiment, the return tube 200 is inclined to penetrate into the drainage cavity 101 at a certain angle, so as to avoid the damage of blood cells caused by rapid steering of blood in the return tube 200. Wherein the second return pipe segment 202 is integrally formed with the third return pipe segment 203. Of course, the second return pipe section 202 and the third return pipe section 203 may be sealed after being formed separately.
The double-cavity cannula provided by the invention is provided with the drainage tube 100 and the return tube 200, the drainage tube 100 and the return tube 200 are integrated into a whole to form a single tube, and when the double-cavity cannula is used, only one puncture hole is formed in the body surface, so that the risk of bleeding infection is obviously reduced compared with the conventional mode of forming two puncture holes in the body surface.
On the reflux pipe 200, the second reflux pipe section 202 is partially connected with the first reflux pipe section 201, when the pipe is placed, the guide core 300 penetrates into the drainage pipe 100 and the first reflux pipe section 201 to squeeze the second reflux pipe section 202 on one side, and the guide core 300 does not need to pass through the second reflux pipe section 202, so that the second reflux pipe section 202 does not need to adapt to the size of the guide core 300, the pipe diameter and the wall thickness can be made smaller, the occupation of the cross-sectional area of the drainage cavity 101 is reduced, and the flow cross-sectional area between the inner wall of the drainage pipe 100 and the outer wall of the second reflux pipe section 202 is larger. Because the blood pressure of the arterial blood returned through the return pipe 200 is larger than the blood pressure of the venous fluid drained through the drainage pipe 100, the arterial blood return is not hindered even if the pipe diameter of the second return pipe section 202 is made small, and under the condition that the cross-sectional area of the drainage cavity 101 is constant, the invention enlarges the overflow area of venous blood drainage by reducing the cross-sectional area of the return pipe 200 in the drainage cavity 101, so that the drainage pipe 100 and the return pipe 200 have enough overflow cross-sectional areas, and the drainage reflux effect is ensured.
The dual lumen catheter provided in this embodiment utilizes a guide core to guide its placement into the body. Referring to fig. 9, a core through hole 301 penetrating through two ends of the core 300 is provided in the core 300, the core through hole 301 is used for penetrating through the guide wire 400, the core through hole 301 includes a butt joint channel 308, and the diameter of the butt joint channel 308 is matched with the diameter of the guide wire 400. Alternatively, the diameter of the docking channel 308 is slightly larger than the diameter of the guidewire 400, or the diameter of the docking channel 308 is equal to the diameter of the guidewire 400. The outer wall of the guide core 300 is provided with a clamping part, and when the guide core 300 is placed in the double-cavity cannula, the clamping part is attached to the inner wall of the drainage cavity 101 and/or the inner wall of the first reflux pipe section 201.
In one possible implementation, the core 300 includes a first core segment 302, a second core segment 303, a third core segment 304, and a fourth core segment 305 that are sequentially connected, and the core through hole 301 penetrates the first core segment 302, the second core segment 303, the third core segment 304, and the fourth core segment 305. The outer diameter of the fourth core segment 305 is larger than the outer diameter of the second core segment 303, the outer diameter of the third core segment 304 gradually decreases from the side close to the fourth core segment 305 to the side close to the second core segment 303, and the outer diameter of the first core segment 302 gradually decreases from the side close to the second core segment 303 to the side far from the second core segment 303. The docking channel 308 is disposed within the first core segment. The clamping portion comprises a first clamping portion 306 and a second clamping portion 307, the first clamping portion 306 is arranged on the first guide core section 302, and the second clamping portion 307 is arranged on the third guide core section 304. Illustratively, the first clamping portion 306 may be located on the first core segment 302 at a position where the first clamping portion is connected to the second core segment 303, and the second clamping portion 307 may be located on the third core segment 304 at a position where the second clamping portion is connected to the fourth core segment 305.
In one possible implementation, the draft tube includes a draft tube transition section 108, the draft tube transition section 108 connects the first return tube section 201, and the outside diameter and inside diameter of the draft tube transition section 108 each taper from a side distal to the first return tube section 201 to a side proximal to the first return tube section 201. Referring to fig. 3 and 4, the side of the first return pipe segment 201 away from the second return pipe segment 202 has a return pipe head end 209, and the inner diameter of the return pipe head end 209 gradually decreases from the side near the second return pipe segment 202 to the side far from the second return pipe segment 202. When the guide core 300 is placed in the dual-cavity cannula, the first guide core section 302 partially extends out of the first backflow pipe section 201, the first clamping portion 306 is attached to the inner wall of the backflow pipe head end, and the second clamping portion 307 is attached to the inner wall of the drainage pipe transition section, so that the guide core 300 is positioned in the dual-cavity cannula. When it should be noted that, the bonding surface between the guide core 300 and the dual-cavity cannula should not be too large, and if the bonding surface is too large, the friction between the dual-cavity cannula and the guide core 300 is increased, which is not beneficial to the evacuation of the guide core 300.
The insertion process of the cannula of the present embodiment includes:
1. the guide core 300 sequentially passes through the drainage connector 102, the drainage cavity 101 and the first backflow pipe section 201, at this time, the guide core 300 extrudes the second backflow pipe section 303 to one side, the front end of the first guide core section 302 of the guide core 300 passes through the first backflow pipe section 201, the first clamping part 306 at the rear end of the first guide core section 302 is attached to the inner wall of the backflow pipe head end 209 on the first backflow pipe section 201, and the second clamping part 307 on the third guide core section 304 is attached to the inner wall of the drainage pipe transition section 108. The first guide core section 302 is located at the head end of the guide core 300, the fourth guide core section 305 is located at the tail end of the guide core 300, when the guide core 300 moves along the direction indicated by the head end, the guide core 300 is always sleeved in the dual-cavity cannula and can drive the dual-cavity cannula to move, and when the guide core 300 moves along the direction indicated by the tail end, the guide core 300 can withdraw from the dual-cavity cannula.
2. The head end of the guide wire 400 is delivered to a designated location (e.g., the left atrium) along the blood vessel through the body surface puncture, and the tail end of the guide wire 400 is exposed outside the body surface.
3. The tail end of the guide wire 400 sequentially passes 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, the outer wall of the guide wire 400 is attached to the inner wall of the butt joint channel 308, 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. The guide wire 400 is used for guiding the guide core 300 and the double-cavity cannula to enter the blood vessel until the reflux hole 207 and the drainage hole 104 of the double-cavity cannula reach the designated positions, and then the guide wire 400 and the guide core 300 are withdrawn from the double-cavity cannula, so that the double-cavity cannula is placed.
When the double-lumen cannula is used for guiding blood, since the blood pressure of arterial blood returned from the return tube 200 to the body is much higher than the blood pressure of venous blood flowing out of the drainage tube 100, the second return tube segment 303 can be spread out under the impact of arterial blood, so that the outer wall of the second return tube segment 303 is tightly attached to the inner wall of the first return tube segment 201, an arterial blood passing channel 211 is formed, and arterial blood is ensured to smoothly flow out of the return hole 207.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (13)
1. A dual lumen cannula comprising:
a drainage tube (100) having a drainage lumen (101);
a return tube (200) passing through the drainage tube (100) and comprising a first return tube section (201) exposed to the distal end of the drainage tube (100), a second return tube section (202) built into the drainage lumen (101) and a third return tube section (203) exposed to the proximal end of the drainage tube (100);
the drainage tube comprises a drainage tube body, a first backflow tube section (201) and a third backflow tube section (203), wherein the first backflow tube section (201) is in sealing connection with the drainage tube body, the proximal end of the second backflow tube section (202) is in sealing connection with the third backflow tube section (203), a fixed portion (204) and a free portion (205) are arranged on the circumference of the distal end of the second backflow tube section (202), the fixed portion (204) is connected with the first backflow tube section (201), and the free portion (205) is provided with a first state attached to the inner wall of the first backflow tube section (201) and a second state detached from the inner wall of the first backflow tube section (201).
2. The dual lumen cannula of claim 1 wherein,
the fixed part (204) has a ratio of less than 1/2 in the circumferential direction of the distal end of the second return pipe section (202);
the free portion (205) has a duty cycle of greater than 1/2 in the circumferential direction of the distal end of the second return tube segment (202).
3. The dual lumen cannula of claim 1 wherein,
the proximal end of the drainage tube (100) is provided with a drainage joint (102), and the third reflux tube section (203) is provided with a reflux joint (206).
4. The dual lumen cannula of claim 1 wherein,
the second backflow pipe section (202) is a thin-wall 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 wall thickness of the second return pipe section (202) is smaller than the wall thickness of the draft tube (100).
5. The dual lumen cannula of claim 1 wherein,
a gap is formed between the outer wall of the second backflow pipe section (202) and the inner wall of the drainage pipe (100);
a drainage hole (104) is formed in the side wall of the distal end of the drainage tube (100), and a return hole (207) is formed in the side wall of the distal end of the first return tube section (201); after cannula completion, the drainage aperture (104) is located in the inferior vena cava, superior vena cava, or right atrium.
6. The dual lumen cannula of claim 1 wherein,
the distal end of the drainage tube (100) is provided with a first through hole (105), and the first reflux tube section (201) penetrates through the first through hole (105) and is in sealing connection with the hole wall of the first through hole (105).
7. The dual lumen cannula of claim 1 wherein,
the outer diameter of the first reflux pipe section (201) is smaller than the outer diameter of the drainage pipe (100);
the outer wall of the first reflux pipe section (201) is in smooth transition with the outer wall of the drainage pipe (100).
8. The dual lumen cannula of claim 7 wherein,
the first backflow pipe section (201) and the drainage pipe (100) are integrally formed.
9. The dual lumen cannula of claim 1 wherein,
the side wall of the proximal end of the drainage tube (100) is provided with a second through hole (106), the return tube (200) penetrates through the second through hole (106) to extend towards the distal end of the drainage tube (100), and the drainage tube (100) is in sealing connection with the hole wall of the second through hole (106).
10. The dual lumen cannula of claim 9 wherein,
the included angle between the second return pipe section (202) and the third return pipe section (203) is greater than 90 degrees.
11. The dual lumen cannula of claim 1 wherein,
the second return pipe section (202) and the third return pipe section (203) are integrally formed.
12. The dual lumen cannula of claim 1 wherein,
a first supporting body (208) is arranged in the pipe wall of the first backflow pipe section (201); the first support body (208) is used for expanding the pipe wall of the first backflow pipe section (201) and enabling the first backflow pipe section (201) to be bendable;
the density of the first supporting body (208) on the side, which is far away from the drainage tube (100), of the first backflow tube section (201) is smaller than that of the first supporting body (208) on the side, which is close to the drainage tube (100), of the first backflow tube section (201), and the flexibility of the side, which is far away from the drainage tube (100), of the first backflow tube section (201) is larger than that of the side, which is close to the drainage tube (100).
13. The dual lumen cannula of claim 4 wherein,
the length of the reflux pipe (200) is larger than that of the drainage pipe (100), after the intubation is completed, a reflux hole (207) on the reflux pipe (200) is positioned in the left atrium, and a drainage hole (104) of the drainage pipe (100) is positioned in the right atrium.
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| CN202311085113.1A CN116870340B (en) | 2023-08-28 | 2023-08-28 | Double-cavity cannula |
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| CN202311085113.1A CN116870340B (en) | 2023-08-28 | 2023-08-28 | Double-cavity cannula |
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| CN116870340B true CN116870340B (en) | 2024-01-30 |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0333308A2 (en) * | 1988-03-17 | 1989-09-20 | Vas-Cath Incorporated | Dual lumen catheter |
| US5106368A (en) * | 1990-04-20 | 1992-04-21 | Cook Incorporated | Collapsible lumen catheter for extracorporeal treatment |
| JPH1057494A (en) * | 1996-08-21 | 1998-03-03 | Buaayu:Kk | Balloon catheter |
| WO1999051153A2 (en) * | 1998-04-02 | 1999-10-14 | Stefanow Alexander R | A cannula of changeable length and shape |
| CN104394785A (en) * | 2012-04-17 | 2015-03-04 | 印第安维尔斯医疗公司 | Steerable endoluminal punch |
| CN105592882A (en) * | 2013-07-18 | 2016-05-18 | 马里兰大学，巴尔的摩 | Self-expanding cannula |
| CN205287209U (en) * | 2016-01-21 | 2016-06-08 | 河南科技大学第一附属医院 | Interior two -chamber gasbag ureter of leading core that is equipped with |
| CN112057728A (en) * | 2020-08-06 | 2020-12-11 | 温州医科大学附属第二医院、温州医科大学附属育英儿童医院 | Intelligent catheter |
| CN113926060A (en) * | 2021-10-27 | 2022-01-14 | 深圳市慧极创新医疗科技有限公司 | Novel ventricular drainage device |
| CN115350349A (en) * | 2022-08-23 | 2022-11-18 | 北京航空航天大学 | ECMO double-cavity cannula |
| WO2022264669A1 (en) * | 2021-06-14 | 2022-12-22 | 朝日インテック株式会社 | Guide wire |
| CN218774140U (en) * | 2022-07-07 | 2023-03-31 | 中国医学科学院阜外医院深圳医院(深圳市孙逸仙心血管医院) | Single double-cavity cannula implanted with ventricular assist system through periphery |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7947012B2 (en) * | 2008-04-24 | 2011-05-24 | Medtronic Vascular, Inc. | Aspiration catheter having selectively deformable tip |
| US20110040241A1 (en) * | 2009-08-11 | 2011-02-17 | Dongfang Wang | Blood access assembly for artificial lung and right ventricular assist device |
| US11406748B2 (en) * | 2020-02-24 | 2022-08-09 | CardiacAssist, Inc | Dual lumen cannula with expandable lumen |
-
2023
- 2023-08-28 CN CN202311085113.1A patent/CN116870340B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0333308A2 (en) * | 1988-03-17 | 1989-09-20 | Vas-Cath Incorporated | Dual lumen catheter |
| JPH01303159A (en) * | 1988-03-17 | 1989-12-07 | Vas Cath Inc | Dual lumen catheter and its production |
| US5106368A (en) * | 1990-04-20 | 1992-04-21 | Cook Incorporated | Collapsible lumen catheter for extracorporeal treatment |
| JPH1057494A (en) * | 1996-08-21 | 1998-03-03 | Buaayu:Kk | Balloon catheter |
| WO1999051153A2 (en) * | 1998-04-02 | 1999-10-14 | Stefanow Alexander R | A cannula of changeable length and shape |
| CN104394785A (en) * | 2012-04-17 | 2015-03-04 | 印第安维尔斯医疗公司 | Steerable endoluminal punch |
| CN105592882A (en) * | 2013-07-18 | 2016-05-18 | 马里兰大学，巴尔的摩 | Self-expanding cannula |
| CN205287209U (en) * | 2016-01-21 | 2016-06-08 | 河南科技大学第一附属医院 | Interior two -chamber gasbag ureter of leading core that is equipped with |
| CN112057728A (en) * | 2020-08-06 | 2020-12-11 | 温州医科大学附属第二医院、温州医科大学附属育英儿童医院 | Intelligent catheter |
| WO2022264669A1 (en) * | 2021-06-14 | 2022-12-22 | 朝日インテック株式会社 | Guide wire |
| CN113926060A (en) * | 2021-10-27 | 2022-01-14 | 深圳市慧极创新医疗科技有限公司 | Novel ventricular drainage device |
| CN218774140U (en) * | 2022-07-07 | 2023-03-31 | 中国医学科学院阜外医院深圳医院(深圳市孙逸仙心血管医院) | Single double-cavity cannula implanted with ventricular assist system through periphery |
| CN115350349A (en) * | 2022-08-23 | 2022-11-18 | 北京航空航天大学 | ECMO double-cavity cannula |
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| Publication number | Publication date |
|---|---|
| CN116870340A (en) | 2023-10-13 |
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