CN112426615B

CN112426615B - Catheter balloon

Info

Publication number: CN112426615B
Application number: CN202110100744.0A
Authority: CN
Inventors: 许永松; 吴健; 秦川; 穆磊; 唐航
Original assignee: BEIJING TAIJIE WEIYE TECHNOLOGY CO LTD
Current assignee: Beijing Taijieweiye Technology Co.,Ltd.
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-04-16
Anticipated expiration: 2041-01-26
Also published as: CN112426615A

Abstract

The invention discloses a catheter balloon, comprising: core yarn; the outer tube is sleeved outside the core wire and defines a flow passage for fluid to pass through with the core wire; the adjusting mechanism comprises a fixed part and a movable part, the fixed part is attached to the far end of the core wire, the fixed part is provided with a guide hole along the axial direction, and the movable part is provided with a guide post matched with the guide hole; a force application member for applying a force to the movable member so that the guide post can slide toward the hole bottom direction of the guide hole; a trigger mechanism having a locked state for holding the guide post at a position away from the bottom of the guide hole and an unlocked state for allowing the guide post to slide freely; a balloon, both ends of which are respectively attached to the distal end of the outer tube and the movable part in a sealing manner, and the interior of the balloon is communicated with the flow passage; wherein: the trigger mechanism is located inside the balloon, and the trigger mechanism is switched from the locked state to the unlocked state based on the pressure of the fluid supplied inside the balloon.

Description

Catheter balloon

Technical Field

The invention relates to the technical field of medical instruments, in particular to a catheter balloon for interventional operation.

Background

When a vessel in a human body is found to be stenotic during an interventional operation, mechanical dilation and flushing (mechanical dilation of the stenotic region to minimize the degree of stenosis) are generally performed on the stenotic region by means of a catheter balloon. A flow passage for liquid to pass through is defined between the outer tube and the core wire, and the proximal end of the outer tube is communicated with the fluid supply device.

When the balloon is conveyed to the narrow area of the vessel by the outer tube, the fluid supply device supplies fluid to the flow channel, the fluid flows into the balloon at the far end through the flow channel with certain pressure, and the balloon is forced to expand to perform dilation on the narrow area of the vessel.

It is known that a balloon is made of an elastic material and is elastically deformed by a fluid pressure to be inflated, but the balloon has a limited inflation capability due to the elastic deformability of the elastic material, and cannot achieve a sufficient inflated size, thereby achieving a maximum dilation effect on a narrow region.

In the prior art, the expanded size is attempted to be increased by increasing the radial size of the balloon in the free state, however, the larger radial size of the balloon in the free state affects the delivery process of the balloon in the vessel, i.e. makes the delivery process of the balloon difficult.

Disclosure of Invention

In view of the above technical problems in the prior art, embodiments of the present invention provide a catheter balloon.

In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:

a catheter balloon, comprising:

core yarn;

the outer tube is sleeved outside the core wire and defines a flow passage for fluid to pass through with the core wire, and the proximal end of the outer tube is used for being communicated with a fluid supply device;

an adjusting mechanism comprising a fixed part and a movable part, wherein the fixed part is attached to the far end of the core wire, the fixed part is provided with a guide hole along the axial direction, and the movable part is provided with a guide post used for matching with the guide hole;

a biasing member for biasing the movable member so that the guide post can slide in a hole bottom direction of the guide hole;

a trigger mechanism having a locked state for holding the guide post at a position away from a hole bottom of the guide hole and an unlocked state for allowing the guide post to slide freely;

a balloon having both ends sealingly attached to the distal end of the outer tube and the movable member, respectively, and an interior of the balloon communicating with the flow passage; wherein:

the trigger mechanism is located inside the balloon, and the trigger mechanism is switched from a locked state to an unlocked state based on the pressure of the fluid supplied into the inside of the balloon.

Preferably, the trigger mechanism comprises:

the accommodating groove is formed in the area, close to the end, of the guide column;

a guide groove radially opened in the fixing member and penetrating the guide hole;

the elastic arm is obliquely and upwards led out from the accommodating groove, and the end part of the elastic arm is used for abutting against the side wall of the guide groove in a free state;

a ball disposed in the guide groove;

the periphery of the pressing plate is attached with an elastic belt, and the edge of the elastic belt is hermetically attached to the peripheral surface of the fixing part; wherein:

the pressure fluid supplied into the balloon forces the pressure plate to be radially pressed against the ball body so that the ball body radially presses the elastic arm, the elastic arm is bent to be received in the receiving groove, and the trigger mechanism is switched from a locking state to a unlocking state.

Preferably, the force application part comprises permanent magnets respectively arranged at the end part of the guide post and the hole bottom of the guide hole.

Preferably, a compression spring is further disposed in the guide hole, and the compression spring is used for applying a resistance force to the guide column opposite to the force applied by the force application component.

Preferably, an end head is formed at the end part of the guide post, a shaft shoulder is formed at the port of the guide hole, and the end head is limited on the shaft shoulder to limit the guide post to be separated from the guide hole.

Preferably, the accommodating groove has a side wall, the elastic arm has an integrally formed attachment plate, and the attachment plate is attached and fixed to the side wall.

Preferably, the connection between the patch and the resilient arm has a weakened area, and the resilient arm is formed to bend and deform at the weakened area.

Preferably, an expansion sleeve is attached to the proximal end of the outer tube, the fluid supply means being in communication with the expansion sleeve.

Compared with the prior art, the catheter balloon disclosed by the invention has the beneficial effects that:

1. the expansion amount of the balloon can be increased to a greater extent by reducing the distance between the two end parts of the balloon in the expansion process of the balloon, and further the expansion amount of the balloon is prevented from being increased by increasing the radial size of the balloon in a free state.

2. The trigger mechanism allows the balloon to maintain its original length during delivery, and to decrease its length during dilation of the stricture.

3. The triggering mechanism controls the reduction length of the saccule based on the fluid pressure in the saccule, and the design is ingenious.

The summary of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the full scope or all features of the disclosed technology.

Drawings

In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments, by way of example and not by way of limitation, and together with the description and claims, serve to explain the inventive embodiments. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

Fig. 1 is a schematic structural diagram of a catheter balloon provided in an embodiment of the present invention.

Fig. 2 is a schematic structural view of a catheter balloon provided in an embodiment of the present invention in a first stage of inflation.

Fig. 3 is a schematic structural view of a catheter balloon provided in an embodiment of the invention in a second stage of inflation.

Fig. 4 is an enlarged view of a portion a of fig. 2 (a state in which an end portion of the elastic arm is in abutment against a side wall of the guide groove).

Fig. 5 is an enlarged view of a portion a of fig. 2 (the end of the elastic arm is disengaged from the side wall of the guide groove).

Fig. 6 is an enlarged view of a portion B of fig. 3.

Reference numerals:

10-an outer tube; 20-core filament; 30-a flow channel; 40-an adjustment mechanism; 41-a movable part; 411-guide post; 42-a stationary part; 421-a guide hole; 43-end; 44-pressure spring; 50-balloon; 60-a permanent magnet; 70-a trigger mechanism; 71-a holding tank; 72-a resilient arm; 721-pasting a board; 722-a region of weakness; 73-a guide groove; 74-sphere; 75-a platen; 76-an elastic band; 80-expanding sleeve; 81-interface; 100-a vessel; 101-narrow area.

Detailed Description

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.

As shown in fig. 1 to 6, an embodiment of the present invention discloses a catheter balloon, the catheter balloon 50 including: the external tube 10, the core wire 20, the adjusting mechanism 40, the force applying component, the trigger mechanism 70, the balloon 50, the expanding sleeve 80 and the compression spring 44.

As shown in fig. 1, a core wire 20 is inserted into an outer tube 10, a flow passage 30 having a ring-shaped cross section is defined between the outer tube 10 and the core wire 20, an expansion sleeve 80 is attached to a proximal end of the outer tube 10, the expansion sleeve 80 is communicated with the flow passage 30, and the expansion sleeve 80 has a port 81 connected to a fluid supply device (e.g., a syringe, a liquid pump).

The adjusting mechanism 40 is disposed at the distal ends of the outer tube 10 and the core wire 20, and specifically, the adjusting mechanism 40 includes: the fixing component 42 and the moving component 41, the fixing component 42 and the moving component 41 are both in a column shape, the tail of the fixing component 42 is attached to the far end of the core wire 20, the fixing component 42 is provided with a guide hole 421 penetrating through the head of the fixing component, the moving component 41 is provided with a guide column 411, the guide column 411 is used for extending into the guide hole 421, a shaft shoulder is formed at the position of the guide hole 421 close to the end, the end of the guide column 411 is detachably connected with a head 43, and the head 43 is stopped by the shaft shoulder so as to limit the guide column 411 to be separated from the guide hole 421.

It should be noted that:

the distal end of the core wire 20 or the outer tube 10 is an end extending into the vessel 100 of the human body, and the proximal end of the core wire 20 or the outer tube 10 is an end located outside the human body for being held or manipulated by the operator.

The balloon 50 is formed in a substantially sleeve shape before being supplied with the pressure fluid, the balloon 50 is made of an elastic material, one end of the balloon 50 is sealingly attached to the outer periphery of the distal end of the outer tube 10, and the other end of the balloon is sealingly attached to the outer periphery of the movable member 41, so that the balloon 50 is in communication with the flow passage 30, and the fluid supplied from the fluid supply means passes through the flow passage 30 into the balloon 50 to inflate the balloon 50 by elastic deformation, and at the same time, the pressure of the fluid supplied into the balloon 50 is increased.

As shown in fig. 4, a trigger mechanism 70 is provided inside the balloon 50, and the trigger mechanism 70 has a locked state for holding the guide pole 411 at a position away from the bottom of the guide hole 421 and an unlocked state for allowing the guide pole 411 to slide freely. Specifically, the trigger mechanism 70 includes: a receiving groove 71, a guide groove 73, an elastic arm 72, a ball 74, a pressing plate 75, and an elastic band 76. The receiving slot 71 is opened at the position of the guiding column 411 close to the end 43, the receiving slot 71 has a vertical side wall, the elastic arm 72 is made of elastic material with certain rigidity, the root of the elastic arm 72 has a patch 721, the patch 721 is attached to the side wall of the receiving slot 71, the connection part of the elastic arm 72 and the patch 721 is set to be a weak area 722 by removing material, so that the elastic arm 72 deforms at the weak area 722 to generate deflection. The guide groove 73 is opened in the fixing member 42 in the radial direction and is penetrated through the guide hole 421, the outer end of the guide groove 73 in the radial direction is provided as a port having a large cross section, the ball 74 is provided in the guide groove 73, the elastic band 76 is made of an elastic material such as silicone, the elastic band 76 is attached to the outer periphery of the pressing plate 75, and the edge of the elastic band 76 is sealingly attached to the outer periphery of the outer end of the guide groove 73, so that the outer port of the guide groove 73 is blocked by the elastic band 76 and the pressing plate 75.

The elastic arm 72 extends obliquely upward, the end of the elastic arm 72 abuts against the groove wall of the guide groove 73 when not subjected to a radial force, at this time, the guide column 411 is held in a non-slidable state by the engagement of the elastic arm 72 with the groove wall of the guide groove 73, and the trigger mechanism 70 is in a locked state in which the movable member 41 is not retracted.

When the pressure of the pressurized fluid inside the balloon 50 is increased to a certain degree, as shown in fig. 5, the pressurized fluid inside the balloon 50 applies a radially inward pressure to the pressing plate 75, so that the pressing plate 75 presses the ball 74 radially inward, and the ball 74 presses the end of the elastic arm 72, so that the elastic arm 72 is accommodated in the accommodating groove 71 and separated from the groove wall of the guide groove 73, and at this time, the guide post 411 can slide toward the bottom of the guide hole 421, and the trigger mechanism 70 is switched from the locked state to the unlocked state.

The force applying component is used for applying a force to the movable component 41 in a direction towards the hole bottom of the guide hole 421, and preferably, the force applying component is a permanent magnet 60 respectively arranged at the end 43 of the guide column 411 and the hole bottom of the guide hole 421, and the two permanent magnets 60 are oppositely arranged in different poles to form magnetic attraction, when the trigger mechanism 70 is in a locking state, the force applying component cannot force the guide column 411 to slide towards the hole bottom of the guide hole 421, and when the trigger mechanism 70 is switched to a unlocking state due to the fact that the pressure of the fluid in the balloon 50 is increased to a certain degree, the force applying component applies a force to the movable component 41 to enable the guide column 411 to slide towards the hole bottom of the guide hole 421.

Choose the spring that elasticity coefficient is less as pressure spring 44 for use, this pressure spring 44 sets up in guiding hole 421, and this pressure spring 44's effect is: when the trigger mechanism 70 is switched to the unlocked state and the guide column 411 slides toward the bottom of the guide hole 421 by the urging member, the pressing spring 44 serves to slow down the sliding speed of the guide column 411, so that the guide column 411 slides slowly.

The advantages of the catheter balloon 50 provided by the present invention will be described below with reference to the method of use of the catheter balloon described above.

First, as shown in fig. 1, the balloon 50 is transported to the stenotic region 101 of the vessel 100 by the outer tube 10 and the core wire 20, then, a fluid is injected into the balloon 50 through the flow passage 30 by the fluid supply device, as shown in fig. 2 and in combination with fig. 4, the fluid entering the balloon 50 forces the balloon 50 to perform a first stage of inflation, and as the balloon 50 inflates, the pressure of the fluid increases, and when the balloon 50 inflates to a limit close to the elastic deformation of the material thereof, as shown in fig. 2 and in combination with fig. 5, the pressure of the fluid forces the pressure plate 75 to move radially inward, the pressure plate 75 simultaneously forces the ball 74 to move radially inward, the ball 74 presses the end of the elastic arm 72 so that the elastic arm 72 is accommodated in the accommodation groove 71, and at this time, the trigger mechanism 70 is switched to the unlocked state.

Meanwhile, under the force of the force application component, the guide column 411 moves towards the bottom of the guide hole 421, which causes the movable component 41 to move towards the fixed component 42, as shown in fig. 3 in combination with fig. 6, so as to effectively reduce the distance between the two end portions of the balloon 50, i.e. the length dimension of the balloon 50, and the distance between the two end portions of the balloon 50 is reduced so as to enable the balloon 50 to expand to a greater extent, so as to achieve a greater dilation of the stenotic region 101 of the vessel 100.

The catheter balloon 50 provided by the present invention has the advantages that:

1. the amount of inflation of the balloon 50 can be increased to a greater extent by decreasing the distance between the two end portions of the balloon 50 during inflation of the balloon 50, thereby avoiding increasing the amount of inflation of the balloon 50 by increasing the radial dimension of the balloon 50 in the free state.

2. Trigger mechanism 70 allows balloon 50 to maintain its original length during delivery, while reducing the length of balloon 50 while dilating stricture 101.

3. The triggering mechanism 70 controls the reduction length of the balloon 50 based on the fluid pressure inside the balloon 50, and is skillfully designed.

Moreover, although exemplary embodiments have been described herein, the scope of the present invention includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.

The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the above-described embodiments, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, inventive subject matter may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.

Claims

1. A catheter balloon, comprising:

core yarn;

2. The catheter balloon of claim 1, wherein the trigger mechanism comprises:

a ball disposed in the guide groove;

3. The catheter balloon according to claim 1, wherein the force application member includes permanent magnets disposed at the end of the guide post and at the bottom of the guide hole, respectively.

4. The catheter balloon according to claim 1, wherein a compression spring is further provided in the guide hole for applying a resistance force to the guide post opposite to the force applied by the force applying member.

5. The catheter balloon according to claim 1, wherein the end of the guide post is formed with a tip, the port of the guide hole is formed with a shoulder, and the tip is limited by the shoulder to limit the guide post from escaping from the guide hole.

6. The catheter balloon of claim 2, wherein the receptacle has a sidewall, and the spring arm has an integrally formed patch that is affixed to the sidewall.

7. The catheter balloon of claim 6, wherein the connection of the patch to the spring arm has a weakened area where the spring arm forms a bending deformation.

8. The catheter balloon of claim 1, wherein an expansion sleeve is attached to the proximal end of the outer tube, the fluid supply device being in communication with the expansion sleeve.