CN118593878A - A multifunctional balloon dilatation catheter - Google Patents

Abstract

The present invention relates to the field of medical device technology, specifically a multifunctional balloon dilatation catheter, comprising a tip and a catheter; the tip is arranged at the end of the catheter, a balloon is wrapped on the outer side of the catheter near the tip, a plurality of balloon limiting mechanisms for sealing and segmenting the balloon are arranged at intervals along the axial direction of the catheter on the inner side of the balloon to form a multi-segment structure with adjustable length, a balloon dilatation inlet and outlet trachea is connected to the catheter corresponding to the inside of the balloon away from the tip, a group of filter capsules are wrapped on the outer side of the catheter between the balloon and the tip, a filter cover is connected to the catheter corresponding to the inside of the filter capsule, the vertical section of the expanded filter capsule is a horizontal V-shaped structure, a layer of filter screen is arranged on the outer surface of the filter capsule, and the filter screen filters the blood passing through and adsorbs impurities. The catheter is flexible to adjust, automatically operated, and has the advantages of a wide range of uses.

Description

A multifunctional balloon dilatation catheter

Technical Field

The invention relates to the technical field of medical devices, in particular to a multifunctional balloon dilatation catheter.

Background Art

The balloon dilatation catheter is an interventional cardiac surgical instrument, mainly used in the fields of cardiology, cardiac surgery and interventional cardiology. It is mainly composed of a balloon, a catheter and a dilator. The balloon is the expanded part at the end of the catheter, which is inflated to dilate the blood vessels or valves. The catheter is a tubular device that guides the balloon to the area that needs treatment. It is classified into balloon dilatation catheters (including directional catheters, balloon catheters, vascular stent catheters, atrection catheters, etc.) and hook-end interventional catheters. The use of balloon dilatation catheters can be used for coronary artery intervention, valve treatment and structural heart disease treatment, such as compressing hemangiomas, dilating narrowed blood vessels, and expanding valve caliber. Balloon dilatation catheter operation has the advantages of minimally invasive, less traumatic, and quick recovery, and has been widely used in the cardiovascular field.

The specific method of using a balloon dilatation catheter is as follows: Before using the balloon dilatation catheter, it is necessary to check whether the assembly, disinfection and aseptic operation of the instrument and accessories meet the requirements, and the balloon, catheter, dilator and other parts must ensure integrity and correctness. Then the patient's whole body is cleaned and disinfected, and fasting or oral medication is required as required by the doctor. During surgery, the catheter is introduced into the blood vessel or heart cavity through a puncture method, and the balloon is guided to the location that needs treatment using a guide wire. After scientific measurement, the balloon is inflated at the prescribed time to expand the balloon, thereby expanding the narrowed blood vessels or valves; however, the existing balloons still have the following problems during expansion and use: When dilating a blood vessel, the length of the expansion is generally predicted by observing in advance before surgery, and then a balloon of the appropriate length is selected for use, resulting in the balloon length in the existing balloon dilatation catheters being fixed in size, lacking flexible and effective automatic adjustment capabilities, because according to the existing advance observation of the blood vessels In terms of detection technology, although in most cases, thrombus can be effectively detected, inaccurate detection cannot be ruled out. That is, when using a balloon for expansion, the expansion distance is insufficient, and it is difficult to fully expand the squeezed blood vessel. At this time, the balloon length is fixed and cannot be adjusted, which affects the accuracy of surgical treatment. In addition, when using a balloon to expand the blood vessel, the thrombus and other impurities attached to the blood vessel will fall off when the balloon contacts and squeezes, and then mix into the blood. If it is not collected and processed in time, it is easy to cause harm to the human body according to the blood flow.

Therefore, in view of the above-mentioned problems, the present technical solution designs a multifunctional balloon dilatation catheter to solve them.

Summary of the invention

The object of the present invention is to provide a multifunctional balloon dilatation catheter to solve the problems raised in the above background technology.

To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multifunctional balloon dilatation catheter, comprising a tip and a catheter; the tip is arranged at the end of the catheter, the tip being arranged with a balloon to help guide the catheter through the tortuous part of the vascular system and enable it to be accurately positioned at the part that needs to be treated, a balloon is arranged in a wrapped manner on the outer side of the catheter near the tip, the balloon is expanded under force to expand the blood vessel wall to achieve the effect of clearing the blood vessel, a plurality of groups of balloon limiting mechanisms are arranged in an interval manner on the inner side of the balloon along the axial direction of the catheter, the balloon limiting mechanisms are used to seal and segment the balloon to form a multi-segment structure with adjustable length, so as to fully and accurately expand and dilate the blood vessels with different distances of clearing and dilation requirements, thereby improving the flexibility and adjustability of the balloon, a balloon expansion inlet and outlet trachea is connected to the corresponding catheter inside the balloon away from the tip, and gas is input into the balloon by using the balloon expansion inlet and outlet trachea, thereby expanding and dilating the balloon;

The balloon limiting mechanism includes a radial telescopic member connected between the inner side of the balloon and the catheter, a power air ring is arranged inside the catheter corresponding to the inner side of the radial telescopic member, and the power air ring is connected to the inner side of the catheter away from the tip and is provided with a balloon extension inlet and outlet trachea, and air is transported to the power air ring through the balloon extension inlet and outlet trachea, and then the radial telescopic member is controlled to release the connection position restriction on the inner side of the balloon, and then the balloon in the connected state is controlled to expand at various positions under the air intake of the balloon expansion inlet and outlet trachea;

A group of filter capsules are wrapped around the outside of the catheter between the balloon and the tip, and a filter cover expansion inlet and outlet trachea are connected to the corresponding catheter inside the filter capsule. Gas is input into the filter capsule through the filter cover expansion inlet and outlet trachea, driving the filter capsule to tilt and expand outward. The vertical cross-section of the expanded filter capsule presents a horizontal V-shaped structure, and the oblique outer arc surface of the filter capsule is used to filter impurities such as thrombus in the flowing blood. A layer of filter screen is provided on the outer surface of the filter capsule, and the filter screen filters and adsorbs impurities in the passing blood. A flow channel is opened on the filter capsule corresponding to the inner side of the filter screen, and the end of the flow channel away from the catheter is set to an opening shape, which is used for blood to enter the flow channel after being filtered by the filter screen, and then automatically flow out along the opening end. The setting of the flow channel is used to prevent the filter screen from directly contacting the outer surface of the filter capsule, which affects the smooth passage of blood through the filter screen.

Compared with the prior art, the present invention has the following beneficial effects: by arranging a filter capsule that is expanded by inflation at a position near the tip of the catheter, and then using the filter screen on the filter capsule to cooperate with the flow channel, the impurities such as thrombus that fall from the blood vessel in the expanded state are filtered and processed, and to a certain extent, the impurities such as thrombus that fall due to the expansion of the blood vessel are reduced to follow the blood flow and cause subsequent harm;

By arranging multiple groups of balloon limiting mechanisms at intervals on the inner side of the balloon in cooperation with the power air ring, that is, utilizing the method of air inlet and outlet, the length of the balloon during expansion is controlled, that is, when dilating the blood vessel, the use length of the balloon can be instantly adjusted according to the required expansion length, thereby fully improving the controllability, adjustability and use range of the catheter during operation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the partial structure of a multifunctional balloon dilatation catheter.

FIG. 2 is a schematic diagram of the enlarged structure of A in FIG. 1 .

FIG. 3 is a schematic diagram of the enlarged structure of B in FIG. 1 .

FIG. 4 is a schematic diagram of the enlarged structure of C in FIG. 1 .

FIG. 5 is an enlarged structural schematic diagram of D in FIG. 1 .

FIG. 6 is a schematic diagram of the three-dimensional structure of a power gas ring in a multifunctional balloon dilatation catheter.

FIG. 7 is a schematic structural diagram of a balloon limiting mechanism in a multifunctional balloon dilatation catheter.

Wherein: tip 10, catheter 11, balloon 12, air pump control valve 13, filter cover expansion inlet and outlet pipe 14, balloon extension inlet and outlet pipe 15, balloon expansion inlet and outlet pipe 17, balloon expansion air inlet and outlet port 18, filter cover expansion air inlet and outlet port 19, filter capsule 20, filter screen 22, flow channel 23, connecting strip 24, sealing separation strip 25, sealing strip 26, telescopic card strip 27, positioning card block 28, positioning card hole 29, power air ring 30, branch inlet pipe 31, expansion airbag compartment 32, expansion airbag 33, L-shaped positioning rod 34, force-bearing arc groove 35, connecting rod 36, elastic telescopic cylinder 37, fixing rod 38, limit block 39, spring 40.

DETAILED DESCRIPTION

It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

Please refer to Figures 1 to 7, a multifunctional balloon dilatation catheter includes a tip 10 and a catheter 11; the tip 10 is arranged at the end of the catheter 11, and the tip 10 is provided with a balloon to help guide the catheter 11 through the tortuous parts of the vascular system and enable it to be accurately positioned at the part that needs to be treated. A balloon 12 is wrapped around the outer side of the catheter 11 near the tip 10, and the balloon 12 is expanded by force to expand the blood vessel wall to achieve the effect of clearing the blood vessels. A plurality of groups of balloon limiting mechanisms are arranged at intervals along the axial direction of the catheter 11 on the inner side of the balloon 12, and the balloon limiting mechanisms are used to seal and segment the balloon 12 to form a multi-segment structure with adjustable length, so as to fully and accurately expand and dilate the blood vessels with different distances of clearing and dilation requirements, thereby improving the flexibility and adjustability of the balloon 12, and a balloon expansion inlet and outlet trachea 17 is connected to the corresponding catheter 11 inside the balloon 12 away from the tip 10, and gas is input into the balloon 12 by using the balloon expansion inlet and outlet trachea 17, thereby expanding and dilating the balloon 12;

The balloon limiting mechanism includes a radial telescopic member connected between the inner side of the balloon 12 and the catheter 11, and a power air ring 30 is arranged inside the catheter 11 corresponding to the inner side of the radial telescopic member. The power air ring 30 is connected to the inner side of the catheter 11 away from the tip 10 and is provided with a balloon extension inlet and outlet trachea 15. The balloon extension inlet and outlet trachea 15 is used to transport air to the power air ring 30, and then the radial telescopic member is controlled to release the connection position restriction on the inner side of the balloon 12, and then the balloon 12 in the connected state is controlled to expand at various positions under the air intake of the balloon expansion inlet and outlet trachea 17;

It should be noted that when the radial telescopic member is in the positioning state, the inside of the balloon 12 on the outside is controlled to be sealed and connected with the outside of the catheter 11. At this time, the insides of the balloons 12 on both sides of the radial telescopic member are sealed and separated, and the inside of the balloon 12 on one side of the balloon expansion inlet and outlet trachea 17 can be driven by the air intake of the balloon expansion inlet and outlet trachea 17 to expand outward, and the inside of the balloon 12 on the other side is fully attached to the outside of the catheter 11 and maintained in a static standby state, that is, through the cooperation between the power air ring 30 and the radial telescopic member, a balloon 12 of a suitable length is selected for expansion and use, that is, the adjustability of the catheter 11 during use is improved and the scope of use is expanded;

A group of filter capsules 20 are wrapped around the outside of the catheter 11 between the balloon 12 and the tip 10. A filter cover expansion inlet and outlet duct 14 is connected to the corresponding catheter 11 inside the filter capsule 20. Gas is input into the filter capsule 20 through the filter cover expansion inlet and outlet duct 14, driving the filter capsule 20 to expand outward. The vertical cross-section of the expanded filter capsule 20 presents a horizontal V-shaped structure. The oblique outer arc surface of the filter capsule 20 is used to filter impurities such as thrombus in the flowing blood. A layer of filter screen 22 is provided on the outer surface of the filter capsule 20. The filter screen 22 filters and adsorbs impurities on the passing blood. A flow channel 23 is opened on the filter capsule 20 corresponding to the inner side of the filter screen 22. The end of the flow channel 23 away from the catheter 11 is set in an open shape, so that the blood enters the flow channel 23 after being filtered by the filter screen 22, and then automatically flows out along the open end. The setting of the flow channel 23 is used to prevent the filter screen 22 from directly contacting the outer surface of the filter capsule 20, which affects the smooth passage of the blood through the filter screen 22.

In the embodiment of the present invention, the tip 10 is rounded and small in size to reduce damage or friction to the inner wall of the blood vessel and can pass through narrow or curved blood vessel sections; the balloon 12 is made of polymer materials, such as polyethylene, polyurethane or polypropylene, etc. Such materials have good elasticity and wear resistance, can withstand the pressure when inflated, and have less friction on the blood vessel wall to reduce blood vessel damage;

At the same time, in order to prevent the space of the flow channel 23 from being overly compressed when the filter capsule 20 and the filter screen 22 expand, thereby affecting the normal flow of blood through the filter screen 22, evenly distributed arc-shaped protrusions are provided on the inner side of the filter screen 22 to prevent the filter screen 22 from directly contacting the outer surface of the filter capsule 20. The material of the arc-shaped protrusions is the same as that of the filter capsule 20 and the filter screen 22.

Among them, it should be noted that the materials of the filter 22, the flow channel 23, and the filter capsule 20 are the same as those of the balloon 12, ensuring that after the gas is input into the filter capsule 20 through the filter cover expansion inlet and outlet trachea 14, the filter capsule 20 can be fully expanded, and then the filter 22 and the flow channel 23 expand synchronously with the filter capsule 20 to expand the interception area of the flowing blood, thereby improving the filtering and cleaning effect of the blood. At the same time, since the filter 22 and the flow channel 23 are arranged on the outside of the filter capsule 20, the structure of the filter 22 is relatively simple. When filtering the blood, it only increases the filtering and cleaning of impurities generated when the blood flow expands at the thrombus blockage to a certain extent, and cannot fully guarantee the high-quality treatment of the blood.

In one embodiment of the present invention, the ends of the filter cover expansion inlet and outlet pipe 14, the balloon extension inlet and outlet pipe 15, and the balloon expansion inlet and outlet pipe 17 away from the tip 10 are connected to a group of air pump control valves 13, and the outside of the air pump control valve 13 is connected to an air intake source. An electromagnetic control valve is provided on the air pump control valve 13, which is used to control the entry and output of gas in the filter cover expansion inlet and outlet pipe 14, the balloon extension inlet and outlet pipe 15, and the balloon expansion inlet and outlet pipe 17, respectively, that is, to ensure that the balloon 12 and the power air ring 30 can be controlled under the connection of the filter cover expansion inlet and outlet pipe 14, the balloon extension inlet and outlet pipe 15, and the balloon expansion inlet and outlet pipe 17. The filter capsule 20 can be inflated and expanded while also being inhaled and contracted. The ends of the filter cover expansion inlet and outlet pipe 14, the balloon extension inlet and outlet pipe 15, and the balloon expansion inlet and outlet pipe 17 away from the air pump control valve 13 are respectively connected to a filter cover expansion inlet and outlet port 19 provided on the internal conduit 11 of the filter capsule 20, a transfer pipe provided inside the power air ring 30, and a balloon expansion inlet and outlet port 18 provided on the internal conduit 11 of the balloon 12. When the filter cover expansion inlet and outlet port 19, the transfer pipe, and the balloon expansion inlet and outlet port 18 are connected, the expansion and contraction of the filter capsule 20 and the balloon 12 are controlled, and the gas entering and exiting the power air ring 30 is controlled.

As a preferred embodiment of the present invention, the power air ring 30 is vertically arranged inside the catheter 11, and the axis of the power air ring 30 coincides with the axis of the catheter 11. The transfer tube located on the inner side of the power air ring 30 is connected to four groups of branch air intake pipes 31 at equal intervals in a ring shape on the inner wall of the power air ring 30. An expansion air bag warehouse 32 is opened inside the power air ring 30 corresponding to the end of the branch air intake pipe 31. The expansion air bag warehouse 32 is set to an opening shape on the side facing the tip 10, and an expansion air bag 33 is connected to the opening. Under the intake of the balloon extended inlet and outlet pipes 15, the air is transferred to the expansion air bag warehouse 32 through the transfer tube and the branch air intake pipe 31, and then the expansion air bag 33 is pushed outward by the gas, and the expansion air bag 33 gradually expands and contacts with the radial telescopic member on the outside.

The radial telescopic member includes a connecting strip 24 connected to the inner wall of the balloon 12 in an annular shape, a sealing separation strip 25 is connected to the inner side of the connecting strip 24, and four radially distributed telescopic clips 27 are installed in an annular manner at equal intervals on the inner side of the sealing separation strip 25. A radial telescopic hole is opened on the tube wall of the catheter 11 corresponding to the telescopic clip 27, and the telescopic clip 27 moves along the radial telescopic hole. A positioning card block 28 is installed at the inner end of the telescopic clip 27, and a positioning card hole 29 is opened on the side of the positioning card block 28 facing the tip 10, and a L is plug-in connected to one side of the positioning card hole 29. The L-shaped positioning rod 34, the other end of the L-shaped positioning rod 34 extends to the outside of the corresponding expansion airbag compartment 32, and a connecting rod 36 is connected to the L-shaped positioning rod 34 on the side of the expansion airbag compartment 32. The end of the connecting rod 36 is telescopically connected to an elastic telescopic cylinder 37, and the top of the elastic telescopic cylinder 37 is installed on the inner wall of the catheter 11 through a fixing rod 38. A limit block 39 is installed at the end of the connecting rod 36 located inside the elastic telescopic cylinder 37. A spring 40 is elastically connected between the limit block 39 and the inner wall of the elastic telescopic cylinder 37. When the spring 40 is in a free state , control the end of the L-shaped positioning rod 34 to be inserted into the positioning card hole 29, at this time, the L-shaped positioning rod 34 is used to be inserted into the positioning card hole 29 to limit the radial movement of the telescopic card strip 27, and then cooperate with the insertion of the four groups of L-shaped positioning rods 34 and the positioning card hole 29 to tightly attach the sealing separation belt 25 and the connecting strip 24 to the outer wall of the catheter 11. When it is necessary to extend the use length of the balloon 12, the air pump control valve 13 is controlled to use the balloon to extend the air inlet and outlet pipes 15 to input gas into the transfer tube, and then drive the inflated air bag 33 to expand outward The expansion pushes the L-shaped positioning rod 34 to move laterally, and then separates the top end of the L-shaped positioning rod 34 from the positioning card hole 29. At this time, under the condition of continuous air intake in the balloon expansion inlet and outlet 18, the balloon 12 is controlled to expand outward. Since the inner end of the telescopic card strip 27 loses its restriction, the telescopic card strip 27 moves outward under the condition of increasing gas in the balloon 12, and then separates the bottom of the sealing separation zone 25 from the outer wall of the catheter 11. At this time, the balloons 12 on both sides of the sealing separation zone 25 expand outward synchronously, that is, the expansion length of the balloon 12 is increased;

Specifically, in order to keep the inflation airbag 33 in full contact with the bottom of the L-shaped positioning rod 34 when it expands and moves outward, a force-bearing arc groove 35 is opened on the side of the L-shaped positioning rod 34 facing the inflation airbag chamber 32. The force-bearing arc groove 35 is used to contact the inflated inflation airbag 33, thereby keeping the L-shaped positioning rod 34 under stable thrust.

It should be noted that when the telescopic strip 27 moves outward along the radial telescopic hole, the circumference of the sealing dividing strip 25 and the sealing dividing strip 25 will also expand synchronously. In order to maintain the smooth expansion and contraction of the connecting strip 24 and the sealing dividing strip 25, a telescopic folding section is provided on the connecting strip 24 and the sealing dividing strip 25 between adjacent telescopic strips 27. The telescopic folding section is used in conjunction with the movement and expansion of the telescopic strip 27 and the balloon 12.

Specifically, sealing strips 26 are provided between the sealing strip 25, the telescopic strip 27, the outer wall of the catheter 11, and the radial telescopic hole to maintain the sealing between the sealing strip 25 and the catheter 11, that is, to control the balloons 12 located on both sides of the sealing strip 25 to be in a fully sealed and separated state;

After the L-shaped positioning rod 34 is separated from the positioning card hole 29, the balloon 12 is forced to expand outward, and the telescopic card strip 27 moves outward along the radial telescopic hole. At the same time, under the resilience of the spring 40, the balloon extends the inlet and outlet trachea 15 and the air inhaled in the balloon 12, and the telescopic card strip 27 is controlled to move back freely along the radial telescopic hole. When it moves back to the maximum position, the L-shaped positioning rod 34 is inserted into the positioning card hole 29 and reset;

At the same time, in order to prevent the telescopic clamping strip 27 from escaping from the radial telescopic hole, a limiting plate is provided at the inner end of the telescopic clamping strip 27 .

The working principle of the present invention is: in the idle position of the device, all the driving parts mentioned above, which refer to power elements, electrical components and adapted power supplies, are connected through wires, and the electrical connections are completed in a sequential working order. The detailed connection means are well-known technologies in the art. The following mainly introduces the working principle and process, and no longer explains the electrical control. When in use, according to the position to be treated, a slender guide wire is inserted from the catheter 11, gradually passes through the narrow part, and is guided to the position to be treated, and the balloon 12 is guided through the narrow section, and then the air pump control valve 13 is controlled to first introduce gas into the balloon expansion inlet and outlet 17, and under the release of the filter cover expansion inlet and outlet 19, the filter capsule 20 is expanded to form a horizontal funnel-shaped structure, and then the filter screen 22 on the outside of the filter capsule 20 cooperates with the flow channel 23 to filter impurities from the flowing blood, and then the length of the position to be expanded is judged by observation, and then the air pump control valve 13 is used again to pass the air into the balloon. Gas is introduced into the balloon extension inlet and outlet pipe 15, and gas is input toward the power air ring 30 according to the length of the position to be expanded. Then, under the connection of the branch inlet pipe 31, the expansion air bag 33 is controlled to expand outward and contact the stressed arc groove 35, and then the L-shaped positioning rod 34 is driven to separate from the positioning card hole 29. At this time, gas is input toward the balloon 12 through the balloon expansion inlet and outlet port 18 again by controlling the air pump control valve 13, and then the balloons 12 located on both sides of the connecting strip 24 are in a connected state. Then, as the gas continues to increase, the balloon 12 expands the inside of the blood vessel. During the expansion, impurities such as thrombi that fall follow the blood to flow toward the filter screen 22, and are filtered and adsorbed by the filter screen 22. After a period of time, the blood vessel is fully expanded, and then the air pump control valve 13 is controlled to use the filter cover expansion inlet and outlet pipe 14, the balloon extension inlet and outlet pipe 15, and the balloon expansion inlet and outlet pipe 17 to inhale, and then the balloon 12 and the filter capsule 20 are adsorbed on the outside of the catheter 11, and then the catheter 11 can be taken out.

Since the focus of the present technical solution is on how to increase the length adjustability of the balloon 12 when in use and how to use the filter capsule 20 to filter and adsorb impurities in the blood, the coordination and distribution relationship between the tip 10, the catheter 11, the balloon 12 and the guide wire are not elaborated in detail. The above-mentioned components are all existing technologies and do not affect the integrity of the present technical solution.

The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims (9)

1. A multifunctional balloon dilation catheter, which is characterized by comprising a tip (10) and a catheter (11); the tip (10) is arranged at the end part of the catheter (11), a balloon (12) is wrapped outside the catheter (11) close to one side of the tip (10), a plurality of groups of balloon limiting mechanisms used for sealing and segmenting the balloon (12) are arranged at intervals along the axial direction of the catheter (11) on the inner side of the balloon (12), a length-adjustable multi-section structure balloon limiting mechanism is formed, and a balloon expanding air inlet and outlet pipe (17) is communicated with the corresponding catheter (11) inside the balloon (12) far away from one side of the tip (10);

The balloon limiting mechanism comprises a radial expansion piece connected between the inner side of the balloon (12) and the catheter (11), a power gas ring (30) is arranged in the catheter (11) corresponding to the inner side of the radial expansion piece, the power gas ring (30) is communicated with the inner side of the catheter (11) far away from the tip (10) and is provided with a balloon extension gas inlet and outlet pipe (15), when the radial expansion piece is in a positioning state, the inner side of the balloon (12) on the outer side of the radial expansion piece is controlled to be in sealing connection with the outer side of the catheter (11), the inner side of the balloon (12) on one side of the balloon extension gas inlet and outlet pipe (17) can be driven by the air inlet of the balloon extension gas inlet and outlet pipe (17) to expand outwards, and the inner side of the balloon (12) on the other side is fully attached to the outer side of the catheter (11) and kept in a standing state for standby;

The utility model discloses a blood filtering device, including sacculus (12) and tip (10), pipe (11) outside parcel that is located between sacculus (12) and tip (10) is provided with a set of filter bag (20), and the intercommunication is provided with filter mantle expansion business turn over trachea (14) on pipe (11) that the inside corresponds of filter bag (20), and the vertical cross-section of filter bag (20) after the expansion is the V type structure of horizontal, filter bag (20) surface is provided with one deck filter screen (22), and filter screen (22) carries out filtering impurity adsorption treatment to the blood of process, has seted up flow channel (23) on filter bag (20) that the filter screen (22) inboard corresponds, and the tip that flow channel (23) kept away from pipe (11) sets up to the opening form.

2. The multifunctional balloon dilation catheter according to claim 1 wherein the inner side of the filter screen (22) is provided with arc-shaped protrusions which are uniformly distributed, and the arc-shaped protrusions are made of the same material as the filter bag (20) and the filter screen (22).

3. The multifunctional balloon dilation catheter according to claim 2, wherein a group of air pump control valves (13) are communicated together at the end parts of the filter cover dilation air inlet and outlet pipe (14), the balloon dilation air inlet and outlet pipe (15) and the balloon dilation air inlet and outlet pipe (17) far away from the tip (10), an air inlet source is communicated outside the air pump control valves (13), electromagnetic control valves are arranged on the air pump control valves (13), the filter cover dilation air inlet and outlet pipe (14), the balloon dilation air inlet and outlet pipe (15) and the end parts of the balloon dilation air inlet and outlet pipe (17) far away from the air pump control valves (13) are respectively communicated with a filter cover dilation air inlet and outlet (19) arranged on an inner catheter (11) of a filter bag (20), a transfer pipe arranged inside a power gas ring (30) and a balloon dilation air inlet and outlet (18) arranged on the inner catheter (11) of the balloon (12).

4. A multifunctional balloon dilation catheter according to claim 3, characterized in that the power gas ring (30) is vertically arranged inside the catheter (11), the axis of the power gas ring (30) coincides with the axis of the catheter (11), four groups of air inlet pipes (31) are communicated with a transit pipe located at the inner side of the power gas ring (30) towards the inner wall of the power gas ring (30) at equal intervals in a ring shape, an inflatable balloon bin (32) is formed in the power gas ring (30) corresponding to the end part of the air inlet pipe (31), one side of the inflatable balloon bin (32) towards the tip (10) is provided with an opening shape, and an inflatable balloon (33) is connected at the opening.

5. The multifunctional balloon dilation catheter according to claim 4, wherein the radial telescopic piece comprises a connecting strip (24) which is connected to the inner wall of the balloon (12) in a ring shape, the inner side of the connecting strip (24) is connected with a sealing separation strip (25), four radially distributed telescopic clamping strips (27) are installed at equal intervals on the inner side of the sealing separation strip (25), radial telescopic holes are formed in the tube wall of a catheter (11) corresponding to the telescopic clamping strips (27), the telescopic clamping strips (27) move along the radial telescopic holes, a positioning clamping block (28) is installed at the inner end of the telescopic clamping strips (27), a positioning clamping hole (29) is formed in one side of the positioning clamping block (28) facing to a tip (10), an L-shaped positioning rod (34) is connected to one side of the positioning clamping hole (29) in a plug-in manner, the other end of the L-shaped positioning rod (34) extends to the outer side of an expansion balloon bin (32) at the corresponding position, a connecting rod (36) is connected to the L-shaped positioning rod (34) on one side of the opposite expansion balloon bin (32), an elastic tube (37) is connected with an elastic tube (37) at the end part of the connecting rod (36), the elastic tube (37) is connected with the elastic tube (37) at the end part, the elastic tube (37) is installed at the end part of the elastic tube (37) through the elastic tube (37), a spring (40) is elastically connected between the limiting block (39) and the inner wall of the elastic telescopic cylinder (37), and when the spring (40) is in a free state, the end part of the control L-shaped positioning rod (34) is inserted into the positioning clamping hole (29).

6. The multifunctional balloon dilation catheter according to claim 5 wherein the L-shaped locating bar (34) is provided with a force-bearing arcuate slot (35) on a side facing the inflation balloon chamber (32).

7. A multifunctional balloon dilation catheter according to claim 6 wherein connecting strips (24) between adjacent telescopic clamping strips (27) and sealing separation strips (25) are provided with telescopic folding sections.

8. The multifunctional balloon dilation catheter according to claim 7 wherein sealing strips (26) are arranged between the sealing separation strips (25) and the telescopic clamping strips (27) and the outer wall and radial telescopic holes of the catheter (11).

9. A multifunctional balloon dilation catheter according to claim 8 wherein the inner end of the telescoping clip strip (27) is provided with a stop plate.