Balloon Dilatation Catheter

Abstract

The present invention relates to the technical field of medical devices and provides a balloon dilation catheter. Among them, the connection seat is axially provided with an installation space, and the installation space sequentially includes a first cavity, a second cavity, and a third cavity along the axial direction. The apertures of the first cavity and the third cavity are larger than the aperture of the second cavity; the catheter assembly includes an outer tube, one end of the outer tube is inserted into the installation space, and a support rod is buried axially in the tube wall of the outer tube; the balloon assembly is fixed to the other end of the outer tube, a medicated area is provided on the outer surface of the balloon assembly, and the balloon assembly can expand or contract along the radial direction of the outer tube; the fixing assembly includes a first limiting block and a second limiting block, which are fixed along the axial direction of the outer tube. The first limiting block is in interference fit with the peripheral side wall of the first cavity, and the second limiting block is in interference fit with the peripheral side wall of the second cavity. With such a setting, the connection seat can drive the balloon assembly to rotate together through the outer tube, so that the medicated area can more accurately align with the lesion position for local drug application.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a balloon dilation catheter. Background Art

[0002] A balloon dilation catheter is a medical interventional device and is widely used in percutaneous transluminal coronary angioplasty (PTCA), that is, the commonly said coronary stent implantation surgery. It is mainly used for the dilation treatment of upper gastrointestinal stenosis.

[0003] A balloon dilation catheter is a flexible catheter with an inflatable balloon at the head end and a connector at the tail end. It is suitable for dilating narrow hollow organs in the human body under image guidance, such as blood vessels, digestive tract, urinary tract, etc. When not inflated, the balloon catheter enters the target lesion site, and after successful treatment, the balloon can be retracted to withdraw the balloon catheter out of the body.

[0004] During use, after the balloon enters the body, the balloon is wrapped by the blood vessel wall and is pressed inward. When the connector is rotated outside the body, relative rotations of varying degrees will occur between the connector and the outer tube, between the outer tube and the balloon, and at both ends of the outer tube itself, resulting in difficulty in synchronously rotating the balloon and the connector. Therefore, in the existing balloon dilation catheter, the drug is coated on the entire circumference of the balloon, so that after the balloon reaches the lesion site and inflates, there will always be some drug that can contact the specific lesion area for drug administration.

[0005] However, when administering drugs to the lesion area in the above manner, drugs will also be administered to some healthy blood vessels, causing irritation and resulting in local inflammation and late adverse vascular morphology in the healthy area.

[0006] Therefore, there is an urgent need for a balloon dilation catheter to solve the above technical problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a balloon dilation catheter, which can enable the connector to drive the balloon assembly to rotate together through the outer tube, so that the drug application area can more accurately align with the lesion position for local drug administration.

[0008] To achieve this purpose, the present invention adopts the following technical solutions:

[0009] A balloon dilation catheter, comprising:

[0010] A connector, the connector is axially provided with an installation space, the installation space axially includes a first cavity, a second cavity and a third cavity in sequence, and the apertures of the first cavity and the third cavity are larger than the aperture of the second cavity;

[0011] Catheter assembly, the above catheter assembly includes an outer tube, one end of the above outer tube penetrates through the above installation space, a support rod is buried axially in the tube wall of the above outer tube, and the above support rod is of the same length as the above outer tube;

[0012] Balloon assembly, the above balloon assembly is fixed to the other end of the above outer tube, a drug application area is arranged on the outer surface of the above balloon assembly for loading drugs, and the above balloon assembly can expand or contract along the radial direction of the above outer tube;

[0013] Fixing assembly, the above fixing assembly includes a first limiting block and a second limiting block, the above outer tube is axially fixed to both of them, the above first limiting block is in interference fit with the peripheral side wall of the above first cavity, and the above second limiting block is in interference fit with the peripheral side wall of the above second cavity.

[0014] As a preferred technical solution of the above balloon dilatation catheter, a first abutting surface is formed at the connection position of the above first cavity and the above second cavity, the above first abutting surface is a conical surface, and one end of the above first limiting block is conical and adapted to the above first abutting surface and abuts against it.

[0015] As a preferred technical solution of the above balloon dilatation catheter, a second abutting surface is formed at the connection position of the above third cavity and the above second cavity, the above second abutting surface is perpendicular to the axial direction of the above second cavity, and one end of the above second limiting block is a plane adapted to the above second abutting surface and abuts against it.

[0016] As a preferred technical solution of the above balloon dilatation catheter, the above connection seat includes a first housing and a second housing, the above installation space is opened in the above first housing, the above second housing is threadedly connected to the above first housing on one side of the above first cavity, and an abutting portion is arranged in the above second housing for axially abutting against the above first limiting block.

[0017] As a preferred technical solution of the above balloon dilatation catheter, a plurality of the above support rods are buried circumferentially in the above outer tube.

[0018] As a preferred technical solution of the above balloon dilatation catheter, the above catheter assembly further includes an inner tube. Axially, the above inner tube includes a first installation section and a second installation section. The above first installation section is coaxially arranged with the above outer tube and penetrates through the above outer tube. The above second installation section is located on the side opposite to the above connection seat with respect to the above first installation section, and the above balloon assembly is sleeved on the above second installation section.

[0019] As a preferred technical solution of the above balloon dilatation catheter, one end of the above balloon assembly is fixed to the above second installation section, and the other end is circumferentially fixed to the inner peripheral wall of the above outer tube. A flow channel communicating with the above balloon assembly is formed between the above outer tube and the above first installation section.

[0020] As a preferred technical solution of the above balloon dilation catheter, a radiopaque ring is provided on the second mounting section, and the radiopaque ring is located within the balloon assembly.

[0021] As a preferred technical solution of the above balloon dilation catheter, two radiopaque rings are axially spaced on the second mounting section, and the medicated area is located between the two radiopaque rings.

[0022] As a preferred technical solution of the above balloon dilation catheter, a plurality of limiting pieces are circumferentially convex on one of the inner peripheral wall of the first cavity and the first limiting block, the limiting pieces extend axially along the mounting space, and the other is provided with a mating insertion groove, and the limiting pieces are inserted into the insertion groove.

[0023] Advantages of the present invention:

[0024] The outer tube axially penetrates through the first cavity, the second cavity and the third cavity in sequence, and the outer tube axially penetrates through the first limiting block and the second limiting block respectively and is fixed to both of them. The first limiting block is located in the first cavity, and its outer peripheral wall is in interference fit with the inner peripheral wall of the first cavity to limit the axial rotation of the outer tube relative to the connecting seat. The second limiting block is in the third cavity, and its outer peripheral wall is in interference fit with the inner peripheral wall of the third cavity to further limit the axial rotation of the outer tube relative to the connecting seat. In this way, when the connecting seat is rotated, the end of the outer tube connected to it can rotate synchronously. Further, a support rod is axially buried in the outer tube, and the support rod connects the two axial ends of the outer tube. In this way, when the outer tube twists around the axis, the relative rotation of its two ends is reduced, and further, the outer tube can drive the balloon assembly to rotate around the axis with the connecting seat more accurately.

[0025] During use, when the balloon assembly in the contracted state and part of the outer tube need to be inserted into the body and reach the lesion position, the operator rotates the connecting seat around the axis outside the body, rotates the balloon assembly through the outer tube, so that the medicated area is aligned with the local lesion, and then the balloon assembly is switched from the contracted state to the expanded state, so that the medicated area can be attached to the local lesion to complete accurate medicating. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0027] Figure 1 is a schematic structural diagram of the balloon dilation catheter provided by the embodiment of the present invention;

[0028] Figure 2 It is a schematic structural diagram of a connection base provided by an embodiment of the present invention;

[0029] Figure 3 It is an assembly schematic diagram of the connection base and an outer tube provided by an embodiment of the present invention;

[0030] Figure 4 It is a schematic cross-sectional structure diagram of the outer tube provided by an embodiment of the present invention;

[0031] Figure 5 It is a schematic structural diagram of the drug application area provided by an embodiment of the present invention Figure 1 ;

[0032] Figure 6 It is a schematic structural diagram of the drug application area provided by an embodiment of the present invention Figure 2 ;

[0033] Figure 7 It is a schematic structural diagram of the drug application area provided by an embodiment of the present invention Figure 3 ;

[0034] Figure 8 It is a schematic structural diagram of the drug application area provided by an embodiment of the present invention Figure 4 。

[0035] In the figure:

[0036] 100, drug;

[0037] 10, connection base; 11, installation space; 111, first cavity; 112, second cavity; 113, third cavity; 114, first abutting surface; 115, second abutting surface; 12, first housing; 13, second housing;

[0038] 21, outer tube; 211, support rod; 212, inner layer; 213, middle layer; 214, outer layer; 22, inner tube; 221, first installation section; 222, second installation section; 23, developing ring;

[0039] 30, balloon assembly;

[0040] 40, fixing assembly; 41, first limiting block; 42, second limiting block. Detailed implementation manners

[0041] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0042] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0044] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0045] As Figures 1 to 4 shown, the present application provides a balloon dilation catheter, which includes a connection seat 10, a catheter assembly, a balloon assembly 30, and a fixing assembly 40. Among them, the connection seat 10 is axially provided with an installation space 11, and the installation space 11 sequentially includes a first cavity 111, a second cavity 112, and a third cavity 113 along the axial direction. The apertures of the first cavity 111 and the third cavity 113 are larger than the aperture of the second cavity 112; the catheter assembly includes an outer tube 21, one end of the outer tube 21 is inserted into the installation space 11, and a support rod 211 is axially embedded in the tube wall of the outer tube 21, and the support rod 211 is as long as the outer tube 21; the balloon assembly 30 is fixed to the other end of the outer tube 21, and a drug application area is provided on the outer surface of the balloon assembly 30 for loading the drug 100, and the balloon assembly 30 can expand or contract radially along the outer tube 21; the fixing assembly 40 includes a first limiting block 41 and a second limiting block 42, and the outer tube 21 is axially fixed to both of them. The first limiting block 41 is in interference fit with the circumferential side wall of the first cavity 111, and the second limiting block 42 is in interference fit with the circumferential side wall of the second cavity 112.

[0046] Specifically, the outer tube 21 axially penetrates through the first cavity 111, the second cavity 112, and the third cavity 113 in sequence, and the outer tube 21 axially penetrates through the first limiting block 41 and the second limiting block 42 respectively and is fixed to both of them. The first limiting block 41 is located in the first cavity 111, and its outer peripheral wall is in interference fit with the inner peripheral wall of the first cavity 111 to limit the axial rotation of the outer tube 21 relative to the connecting seat 10. The second limiting block 42 is in the third cavity 113, and its outer peripheral wall is in interference fit with the inner peripheral wall of the third cavity 113 to further limit the axial rotation of the outer tube 21 relative to the connecting seat 10. In this way, when the connecting seat 10 is rotated, one end of the outer tube 21 connected thereto can rotate synchronously therewith. Further, a support rod 211 is axially buried in the outer tube 21, and the support rod 211 connects the two axial ends of the outer tube 21. In this way, when the outer tube 21 twists around the axis, the relative rotation of its two ends is reduced, and thus, the outer tube 21 can more accurately drive the balloon assembly 30 to rotate around the axis along with the connecting seat 10.

[0047] During use, when the balloon assembly 30 in the contracted state and a part of the outer tube 21 need to extend into the body and reach the lesion site, the operator rotates the connecting seat 10 around the axis outside the body, and rotates the balloon assembly 30 through the outer tube 21 so that the medicated area is aligned with the local lesion. Subsequently, the balloon assembly 30 is switched from the contracted state to the inflated state so that the medicated area can be attached to the local lesion to complete accurate medicating.

[0048] It should be noted that the structure of the balloon assembly 30 is a prior art and will not be elaborated here.

[0049] Moreover, since the apertures of the first cavity 111 and the third cavity 113 are larger than the aperture of the second cavity 112, the first limiting block 41 and the second limiting block 42 cannot pass through the second cavity 112, thereby restricting the axial movement of the outer tube 21 relative to the connecting seat 10.

[0050] Further, the inner peripheral wall of the second cavity 112 provides radial support for the outer tube 21 to protect the outer tube 21 and prevent the outer tube 21 from breaking in the installation space.

[0051] Optionally, a first abutting surface 114 is formed at the connection position between the first cavity 111 and the second cavity 112. The first abutting surface 114 is a conical surface, and one end of the first limiting block 41 is conical and adapted to the first abutting surface 114 and abuts against it. With such a setting, the conical surface forms a guiding surface, making it easier for the outer tube 21 to be aligned when axially inserted from the first cavity 111 into the second cavity 112, and the contact area of the conical surface is relatively large, which can increase the friction between the first limiting block 41 and the side wall of the first cavity 111.

[0052] Optionally, a second abutting surface 115 is formed at the connection position between the third cavity 113 and the second cavity 112. The second abutting surface 115 is perpendicular to the axial direction of the second cavity 112. One end of the second limiting block 42 is a plane adapted to the second abutting surface 115 and abuts against it.

[0053] Optionally, the connecting seat 10 includes a first housing 12 and a second housing 13. The installation space 11 is opened in the first housing 12. The second housing 13 is threadedly connected to the first housing 12 on one side of the first cavity 111. Abutting portions are provided in the second housing 13 for axially abutting against the first limiting block 41.

[0054] Specifically, when installing the outer tube 21 and the connecting seat 10, first insert the outer tube 21 into the installation space 11 of the first housing 12, then sleuth the first limiting block 41 on the outer tube 21 and enter the first cavity 111 along the axial direction of the outer tube 21. One side end surface of the first limiting block 41 abuts against the first abutting surface 114. Fill glue into the gap between the outer tube 21 and the first limiting block 41 to fix the two. Sleeve the second housing 13 on the outer tube 21 and threadedly connect it to the first housing 12 along the axial direction. As it is tightened, the abutting portion extends into the first cavity 111 and presses against the first limiting block 41, so that the first limiting block 41 can further abut against the first abutting surface 114. Finally, on the other side of the first housing 12 in the axial direction, sleeve the second limiting block 42 on the outer tube 21 and enter the second cavity 112. After one side end surface of the second limiting block 42 abuts against the second abutting surface 115, fill glue into the gap between the outer tube 21 and the second limiting block 42.

[0055] Optionally, a plurality of support rods 211 are buried along the circumferential direction of the outer tube 21. With such a setting, by providing a plurality of support rods 211 to jointly support the outer tube 21, the relative torsion at both axial ends of the outer tube 21 during rotation around the axis can be reduced.

[0056] Optionally, the catheter assembly further includes an inner tube 22. Along the axial direction, the inner tube 22 includes a first installation section 221 and a second installation section 222. The first installation section 221 is coaxially arranged with the outer tube 21 and passes through the outer tube 21. The second installation section 222 is located on the side opposite to the connecting seat 10 relative to the first installation section 221. The balloon assembly 30 is sleeved on the second installation section 222. When the balloon assembly 30 is in a contracted state, it wraps around the inner tube 22, and the inner tube 22 axially supports the balloon assembly 30 to extend into the body.

[0057] Optionally, one end of the balloon assembly 30 is fixed to the second mounting section 222, and the other end is circumferentially fixed to the inner peripheral wall of the outer tube 21. A flow channel communicating with the balloon assembly 30 is formed between the outer tube 21 and the first mounting section 221. Gas or liquid is injected into the balloon assembly 30 through the flow channel between the inner tube 22 and the outer tube 21, and its internal space is filled to achieve the inflation effect.

[0058] Optionally, the second mounting section 222 is provided with a radiopaque ring 23, and the radiopaque ring 23 is located inside the balloon assembly 30. In this way, the approximate position of the balloon assembly 30 in the body can be displayed through the radiopaque ring 23.

[0059] Optionally, two radiopaque rings 23 are axially spaced along the second mounting section 222, and the medicated area is located between the two radiopaque rings 23. In this way, the position of the medicated area is located by the two radiopaque rings 23, so that the medicated area can be more accurately aligned with the lesion position for local medication.

[0060] Optionally, one of the inner peripheral wall of the first cavity 111 and the first limiting block 41 is provided with a plurality of limiting pieces protruding circumferentially. The limiting pieces extend along the axial direction of the installation space 11, and the other is provided with a plugging groove adapted thereto, and the limiting pieces are plugged into the plugging groove. Such a setting enables the connecting seat 10 and the first limiting block 41 to achieve synchronous rotation through the plugging relationship, and the reliability is stronger.

[0061] Optionally, the first limiting block 41 and the second limiting block 42 are made of a polymer material.

[0062] Optionally, the outer tube 21 is a braided network tube, which includes an inner layer 212, a middle layer 213 and an outer layer 214 in the radial direction. The support rod 211 is located between the middle layer 213 and the outer layer 214 and is wrapped by the middle layer 213. The middle layer 213 fills the gaps between the circumferentially adjacent support rods 211 and the gaps between the support rods 211 and the outer layer 214.

[0063] Optionally, the inner tube 22 is divided into an inner layer, a middle layer and an outer layer in the radial direction. Among them, the inner layer is made of polytetrafluoroethylene material, and its surface is smooth, which can reduce friction and enable the catheter assembly to rotate fully around the axis smoothly.

[0064] As Figures 5 to 8 shown, in the medicated area of the balloon assembly 30, by using shielding toolings with different hollow shapes, the drug 100 can be sprayed into any pre-set shape in the medicated area, and the shape is adapted to the shape of the lesion area, thereby reducing the contact area between the drug 100 and the normal area.

[0065] Furthermore, a pattern identical to the spraying pattern of the drug 100 in the drug application area is also provided on the connecting seat 10 or the outer tube 21. The two patterns are located on the extension line of the same generatrix of the outer tube 21. In this way, it can not only solve the problem that it is difficult to distinguish the pattern in the drug application area when the balloon assembly 30 is in a contracted state, but also know the specific orientation of the drug 100 in the drug application area through the pattern located outside the body when applying the drug to the lesion location, so as to align it with the specific lesion area by rotation.

[0066] In addition, the above are only the preferred embodiments of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. Balloon dilation catheter, characterized in that, Comprising: A connecting seat (10), the connecting seat (10) being axially provided with an installation space (11), the installation space (11) axially including a first cavity (111), a second cavity (112) and a third cavity (113) in sequence, the apertures of the first cavity (111) and the third cavity (113) being larger than the aperture of the second cavity (112); A catheter assembly, the catheter assembly including an outer tube (21), one end of the outer tube (21) being inserted into the installation space (11), a support rod (211) being axially embedded in the tube wall of the outer tube (21), the support rod (211) being the same length as the outer tube (21); A balloon assembly (30), the balloon assembly (30) being fixed to the other end of the outer tube (21), a medicated area being provided on the outer surface of the balloon assembly (30) for loading a drug (100), the balloon assembly (30) being capable of expanding or contracting radially along the outer tube (21); A fixing assembly (40), the fixing assembly (40) including a first limiting block (41) and a second limiting block (42), the outer tube (21) being axially fixed to both of them, the first limiting block (41) being in interference fit with the circumferential side wall of the first cavity (111), and the second limiting block (42) being in interference fit with the circumferential side wall of the second cavity (112); A plurality of the support rods (211) are circumferentially embedded in the outer tube (21); The catheter assembly further includes an inner tube (22), axially, the inner tube (22) including a first installation section (221) and a second installation section (222), the first installation section (221) being coaxially arranged with the outer tube (21) and inserted into the outer tube (21), the second installation section (222) being located on the side opposite to the connecting seat (10) relative to the first installation section (221), and the balloon assembly (30) being sleeved on the second installation section (222); The second installation section (222) is provided with a developing ring (23), and the developing ring (23) is located inside the balloon assembly (30); Two of the developing rings (23) are axially spaced apart on the second installation section (222), and the medicated area is located between the two developing rings (23).

2. The balloon dilation catheter according to claim 1, characterized in that, A first abutting surface (114) is formed at the connection position between the first cavity (111) and the second cavity (112), the first abutting surface (114) being a conical surface, and one end of the first limiting block (41) being conical and adapted to the first abutting surface (114) and abutting against it.

3. The balloon dilation catheter according to claim 2, wherein A second abutting surface (115) is formed at the connection position between the third cavity (113) and the second cavity (112), the second abutting surface (115) being perpendicular to the axis of the second cavity (112), and one end of the second limiting block (42) being a plane adapted to the second abutting surface (115) and abutting against it.

4. The balloon dilation catheter according to claim 2, wherein The connecting seat (10) includes a first housing (12) and a second housing (13). The installation space (11) is formed inside the first housing (12). The second housing (13) is threadedly connected to the first housing (12) on one side of the first cavity (111). A contact portion is provided inside the second housing (13) for axially contacting the first limiting block (41).

5. The balloon dilation catheter according to claim 1, characterized in that, One end of the balloon assembly (30) is fixed to the second installation section (222), and the other end is circumferentially fixed to the inner peripheral wall of the outer tube (21). A flow channel communicating with the balloon assembly (30) is formed between the outer tube (21) and the first installation section (221).

6. The balloon dilation catheter according to any one of claims 1-5, characterized in that, Multiple limiting pieces are circumferentially protruded on one of the inner peripheral wall of the first cavity (111) and the first limiting block (41). The limiting pieces extend along the axial direction of the installation space (11). The other one is provided with a plugging slot adapted thereto, and the limiting pieces are plugged into the plugging slot.

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