A balloon dilatation catheter for intracranial arteries

Abstract

The invention discloses a balloon dilatation catheter for intracranial arteries, comprising a catheter outer tube, a catheter inner tube, a dilatation balloon, a Tip head and a catheter seat, wherein a circulation cavity is provided inside the catheter inner tube at a position corresponding to the dilatation balloon, a liquid inlet connected to the end of the circulation cavity is provided on the outer wall of the Tip head and the catheter inner tube at the connection point, a drainage pipe is fixedly inserted and connected to the outer wall of the catheter inner tube at the outer wall of the dilatation balloon, the inner cavity of the drainage pipe is connected to the circulation cavity, and the outer wall of the drainage pipe is fixedly inserted and connected to the outer wall of the catheter outer tube. The invention provides a liquid inlet between the catheter inner tube and the Tip head, a drainage pipe is provided between the catheter outer tube and the catheter inner tube, and the circulation cavity provided in the catheter inner tube is used to connect the liquid inlet and the drainage pipe, so that the blood in the blood vessel can circulate along the liquid inlet, the circulation cavity and the drainage pipe, and blockage of the blood in the blood vessel is avoided, thereby reducing the risk of using the balloon dilatation catheter.

Description

Technical Field

[0001] The invention relates to the field of medical devices, and in particular to a balloon dilatation catheter for intracranial arteries. Background Art

[0002] Cerebrovascular disease ranks second among the causes of death worldwide, with about 1.73 million people dying from stroke each year. Stroke is a syndrome characterized by acute neurological deficits lasting at least 24 hours, mainly manifested by involvement of central nervous system lesions, and is the result of cerebral circulation disturbances. Traditional treatments use drugs or craniotomy or a combination of the two, but due to the complex structure of intracranial blood vessels, these treatments have great limitations, resulting in poor treatment effects. With the continuous development of minimally invasive interventional treatments, interventional treatment techniques for intracranial vascular diseases are becoming more and more advanced, such as intracranial vascular stenting, intravascular thrombectomy, and aspiration therapy, which have brought great benefits to patients.

[0003] Percutaneous transluminal angioplasty is one of the interventional techniques. It refers to a non-surgical minimally invasive treatment in which balloon catheters, metal stents and other devices are delivered to the lesion site through blood vessels after percutaneous puncture to dilate narrowed and occluded diseased blood vessels to restore their patency.

[0004] The balloon dilatation catheter currently used for intracranial artery treatment will stay in the blood vessel for a period of time when it is inserted into the intracranial artery for vascular treatment, so that the operator can inject normal saline into the balloon to expand the balloon, thereby expanding the narrowed or blocked blood vessel to facilitate treatment or stent installation. However, the expanded balloon will temporarily block the inside of the blood vessel, and the blockage of the blood vessel will cause blood circulation to be obstructed, so that the time for the balloon dilatation catheter to be inserted into the blood vessel is limited, and blood blockage may easily occur for a long time. Therefore, the operator's skills are required to be high, and the risk of using the balloon dilatation catheter is increased. Summary of the invention

[0005] The object of the present invention is to provide a balloon dilatation catheter for intracranial arteries to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a balloon dilatation catheter for intracranial arteries, comprising a catheter outer tube, a catheter inner tube, a dilatation balloon, a Tip head and a catheter seat, wherein the catheter inner tube is placed in the inner cavity of the catheter outer tube, one end of the dilatation balloon is fixedly connected to one end of the catheter outer tube, the other end of the dilatation balloon is fixedly connected to one end of the Tip head, the end of the catheter inner tube passes through the dilatation balloon and is fixedly connected to the inner wall of the Tip head, and the catheter seat is fixedly connected to the other end of the catheter outer tube;

[0007] A flow cavity is provided inside the inner tube of the catheter at a position corresponding to the expansion balloon, a liquid inlet connected to the end of the flow cavity is provided on the outer wall of the connection between the Tip head and the inner tube of the catheter, a drainage tube is fixedly inserted and connected to the outer wall of the inner tube of the catheter at a position on one side of the expansion balloon, the inner cavity of the drainage tube is connected to the flow cavity, and the outer wall of the drainage tube is fixedly inserted and connected to the outer wall of the outer tube of the catheter.

[0008] Preferably, the liquid inlet, the circulation cavity and the discharge pipe are multiple and arranged in a circular array, the liquid inlet is located at the end of the outer wall of the circulation cavity, the discharge pipe is located at the other end of the outer wall of the circulation cavity, and the liquid inlet and the discharge pipe are both inclined and the inclination angle is axially symmetrical.

[0009] Preferably, a guidewire cavity is provided in the middle of the inner cavity of the catheter inner tube, and a fluid guide cavity is provided in the gap between the inner wall of the catheter outer tube and the outer wall of the catheter inner tube, and the fluid guide cavity is communicated with the inner cavity of the expansion balloon.

[0010] Preferably, one end of the catheter seat is fixedly connected to a heat shrink tube, and the heat shrink tube is sleeved on the outside of the catheter outer tube.

[0011] Preferably, a first connector is fixedly provided on the top of the catheter seat, a second connector is fixedly provided on one end of the catheter seat, and the inner cavity of the first connector is connected to the fluid guide cavity, and the inner cavity of the second connector is connected to the guide wire cavity.

[0012] Preferably, a developing ring is fixedly provided on the outer wall of the inner tube of the catheter, and the developing ring is two and symmetrically arranged at the two end positions of the inner cavity of the expansion balloon.

[0013] Preferably, the outer wall of the expansion balloon is coated with a lubricating coating, and the lubricating coating is a super-hydrophilic coating.

[0014] Preferably, a fixing block is fixedly connected between the inner wall of the catheter outer tube and the outer wall of the catheter inner tube, and the fixing block is in the shape of an elongated strip.

[0015] Technical effects and advantages of the present invention:

[0016] (1) The present invention provides a liquid inlet between the inner tube of the catheter and the tip head, and a liquid discharge tube between the outer tube of the catheter and the inner tube of the catheter. The liquid inlet and the liquid discharge tube are connected by a flow cavity provided in the inner tube of the catheter, so that the blood in the blood vessel can flow along the liquid inlet, the flow cavity and the liquid discharge tube, thereby avoiding blockage of the blood in the blood vessel, thereby reducing the risk of using the balloon dilatation catheter;

[0017] (2) The present invention utilizes the arrangement of the first connector and the second connector on the catheter seat, so that the operator can quickly distinguish the connection ports of the liquid guide cavity and the guide wire cavity, so that the operator can quickly inject the drug solution or the guide wire, thereby improving the convenience of using the balloon dilatation catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front cross-sectional structural schematic diagram of the present invention.

[0019] Figure 2 It is a schematic diagram of the partial cross-sectional structure of the inner tube of the present invention from the front.

[0020] Figure 3 It is a schematic diagram of the side sectional structure of the inner tube of the present invention.

[0021] Figure 4 For the present invention Figure 1 Schematic diagram of the local enlarged structure at A.

[0022] Figure 5 For the present invention Figure 1 Schematic diagram of the local enlarged structure at point B.

[0023] Figure 6 It is a schematic diagram of the side cross-sectional structure of the outer tube of the catheter of the present invention.

[0024] In the figure: 1. catheter outer tube; 2. catheter inner tube; 3. balloon; 4. tip head; 5. developing ring; 6. heat shrink tube; 7. catheter seat; 8. first connector; 9. second connector; 10. guide wire cavity; 11. liquid guide cavity; 12. liquid inlet; 13. circulation cavity; 14. drainage pipe; 15. fixing block. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The present invention provides Figure 1-6The balloon dilatation catheter for intracranial arteries shown in the figure comprises an outer catheter tube 1, an inner catheter tube 2, a dilatation balloon 3, a tip head 4 and a catheter seat 7, wherein the inner catheter tube 2 is placed in the inner cavity of the outer catheter tube 1, and a fixing block 15 is fixedly connected between the inner wall of the outer catheter tube 1 and the outer wall of the inner catheter tube 2, and the fixing block 15 is in the shape of an elongated strip. By setting the fixing block 15, the inner catheter tube 2 can be fixedly set in the inner cavity of the outer catheter tube 1, thereby improving the transmission of the pushing force between the outer catheter tube 1 and the inner catheter tube 2 during use, and avoiding the occurrence of friction between the outer catheter tube 1 and the inner catheter tube 2. When pushing, relative deviation occurs and bending occurs, so that the passability of the catheter outer tube 1 and the catheter inner tube 2 is higher, one end of the expansion balloon 3 is fixedly connected to one end of the catheter outer tube 1, and the other end of the expansion balloon 3 is fixedly connected to one end of the Tip head 4, and the end of the Tip head 4 is tapered to improve the passability of the Tip head 4 and reduce damage to the blood vessel. The end of the catheter inner tube 2 passes through the expansion balloon 3 and is fixedly connected to the inner wall of the Tip head 4. The connection between the expansion balloon 3 and the Tip head 4 is a smooth transition, and the catheter seat 7 is fixedly connected to the other end of the catheter outer tube 1;

[0027] A circulation cavity 13 is provided inside the catheter inner tube 2 at a position corresponding to the expansion balloon 3, a liquid inlet 12 connected to the end of the circulation cavity 13 is provided on the outer wall of the connection between the tip head 4 and the catheter inner tube 2, and a drainage tube 14 is fixedly inserted and connected to the outer wall of the catheter inner tube 2 and located on one side of the expansion balloon 3, the inner cavity of the drainage tube 14 is connected to the circulation cavity 13, and the outer wall of the drainage tube 14 is fixedly inserted and connected to the outer wall of the catheter outer tube 1, and the connection between the drainage tube 14 and the catheter outer tube 1 is sealed to improve the sealing performance of the catheter outer tube 1, and multiple circulation cavities 13 can be arranged at annular intervals, and the circulation cavities 13 correspond to the liquid inlet 12 and the drainage tube 14 one by one, so that multiple circulation channels for blood circulation are formed in the catheter inner tube 2, avoiding blood in the blood vessels from being blocked in one place, reducing the damage to the blood vessels caused by blood blockage, and at the same time extending the use time of the balloon dilatation catheter and reducing the skill requirements for operation;

[0028] The liquid inlet 12, the circulation cavity 13 and the liquid discharge pipe 14 are all multiple and arranged in a circular array. The liquid inlet 12 is located at the end of the outer wall of the circulation cavity 13, and the liquid discharge pipe 14 is located at the other end of the outer wall of the circulation cavity 13. The liquid inlet 12 and the liquid discharge pipe 14 are both inclined and the inclination angle is axisymmetric. The liquid inlet 12 and the liquid discharge pipe 14 are symmetrically inclined, which can play a conductive role in the circulation of blood and improve the smoothness of blood circulation.

[0029] A guidewire cavity 10 is provided in the middle of the inner cavity of the catheter inner tube 2, and a liquid guide cavity 11 is provided in the gap between the inner wall of the catheter outer tube 1 and the outer wall of the catheter inner tube 2, and the liquid guide cavity 11 is connected with the inner cavity of the expansion balloon 3. The external liquid medicine is injected into the inner cavity of the catheter outer tube 1 from the first connector 8, and then flows into the inner cavity of the expansion balloon 3 along the liquid guide cavity 11, so that the expansion balloon 3 is propped up by the liquid, and the inner wall of the blood vessel is expanded, so as to improve the quality of the intracranial artery or install the stent;

[0030] One end of the catheter seat 7 is fixedly connected with a heat shrink tube 6, and the heat shrink tube 6 is sleeved on the outside of the catheter outer tube 1. The heat shrink tube 6 can be a metal-based hypotube, so that it has good anti-kink and propulsion and rotation performance. The top of the catheter seat 7 is fixedly provided with a first connector 8 connected thereto, and one end of the catheter seat 7 is fixedly provided with a second connector 9, and the inner cavity of the first connector 8 is connected to the liquid guide cavity 11, and the inner cavity of the second connector 9 is connected to the guide wire cavity 10. The first connector 8 and the second connector 9 are arranged in conjunction with the catheter seat 7, which is convenient for the operator to inject the liquid or insert the guide wire, and plays a good role in classification and division of work, thereby improving the convenience of operation;

[0031] The outer wall of the inner tube 2 of the catheter is fixedly provided with a developing ring 5. There are two developing rings 5 ​​that are symmetrically arranged at the two end positions of the inner cavity of the expansion balloon 3. The setting of the developing ring 5 can contact external equipment to determine the insertion position of the balloon expansion catheter, thereby improving the convenience and accuracy of use. The outer wall of the expansion balloon 3 is coated with a lubricating coating, and the lubricating coating is a super-hydrophilic coating. The setting of the lubricating coating can increase the permeability of the expansion balloon 3 in the blood vessel and reduce damage to the blood vessel.

[0032] The working principle of the present invention is as follows: after the balloon dilatation catheter is inserted into the intracranial artery of the patient, physiological saline is injected into the inner cavity of the dilatation balloon 3 along the liquid guide cavity 11 through the first connector 8, so that the dilatation balloon 3 is deformed and expanded, and the blocked or narrowed area in the blood vessel is expanded. When the dilatation balloon 3 is inflated and expanded, the blood in the blood vessel enters the flow cavity 13 in the catheter inner tube 2 from the liquid inlet 12 on the Tip head 4, and then is discharged from the drainage tube 14, so that the blood in the blood vessel will not be blocked by the inflated dilatation balloon 3, and the blood in the blood vessel can form a flow channel when the balloon dilatation catheter is inserted, avoiding blood accumulation in the blood vessel, thereby reducing the risk for the operator.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", and "fix" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The standard parts used in the present invention can all be purchased from the market, and the special-shaped parts can all be customized according to the description and the drawings.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A balloon dilatation catheter for intracranial arteries, comprising a catheter outer tube (1), a catheter inner tube (2), a dilatation balloon (3), a tip head (4) and a catheter seat (7), characterized in that: The catheter inner tube (2) is placed in the inner cavity of the catheter outer tube (1), one end of the expansion balloon (3) is fixedly connected to one end of the catheter outer tube (1), the other end of the expansion balloon (3) is fixedly connected to one end of the Tip head (4), the end of the catheter inner tube (2) passes through the expansion balloon (3) and is fixedly connected to the inner wall of the Tip head (4), and the catheter seat (7) is fixedly connected to the other end of the catheter outer tube (1); A circulation cavity (13) is provided inside the inner tube of the catheter (2) at a position corresponding to the expansion balloon (3); a liquid inlet (12) connected to the end of the circulation cavity (13) is provided on the outer wall of the connection between the tip head (4) and the inner tube of the catheter (2); a drainage tube (14) is fixedly inserted and connected to the outer wall of the inner tube of the catheter (2) at a position on one side of the expansion balloon (3); the inner cavity of the drainage tube (14) is connected to the circulation cavity (13), and the outer wall of the drainage tube (14) is fixedly inserted and connected to the outer wall of the outer tube of the catheter (1); The liquid inlet (12), the circulation cavity (13) and the liquid discharge pipe (14) are all multiple and arranged in a ring array, the liquid inlet (12) is located at the end of the outer wall of the circulation cavity (13), the liquid discharge pipe (14) is located at the other end of the outer wall of the circulation cavity (13), and the liquid inlet (12) and the liquid discharge pipe (14) are both arranged inclined and the inclination angle is axisymmetric; A guidewire cavity (10) is provided in the middle of the inner cavity of the catheter inner tube (2), and a fluid guide cavity (11) is provided in the gap between the inner wall of the catheter outer tube (1) and the outer wall of the catheter inner tube (2), and the fluid guide cavity (11) is connected to the inner cavity of the expansion balloon (3).

2. A balloon dilatation catheter for intracranial arteries according to claim 1, characterized in that: One end of the catheter seat (7) is fixedly connected to a heat shrink tube (6), and the heat shrink tube (6) is sleeved on the outside of the catheter outer tube (1).

3. A balloon dilatation catheter for intracranial arteries according to claim 1, characterized in that: A first connector (8) is fixedly provided on the top of the catheter seat (7), a second connector (9) is fixedly provided on one end of the catheter seat (7), and the inner cavity of the first connector (8) is connected to the liquid guide cavity (11), and the inner cavity of the second connector (9) is connected to the guide wire cavity (10).

4. A balloon dilatation catheter for intracranial arteries according to claim 1, characterized in that: The outer wall of the inner tube (2) of the catheter is fixedly provided with a developing ring (5), and the developing ring (5) is in two pieces and is symmetrically arranged at the two end positions of the inner cavity of the expansion balloon (3).

5. The intracranial artery balloon dilatation catheter according to claim 1, characterized in that: The outer wall of the expansion balloon (3) is coated with a lubricating coating, and the lubricating coating is a super-hydrophilic coating.

6. The intracranial artery balloon dilatation catheter according to claim 1, characterized in that: A fixing block (15) is fixedly connected between the inner wall of the catheter outer tube (1) and the outer wall of the catheter inner tube (2), and the fixing block (15) is in the shape of a long strip.

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