CN114569307A

CN114569307A - Catheter tube

Info

Publication number: CN114569307A
Application number: CN202011380158.8A
Authority: CN
Inventors: 宗玲珑; 王国旭; 赵艺文; 黄珍珍; 谭家宏
Original assignee: Shanghai Microport Longmai Medical Equipment Co ltd
Current assignee: Shanghai Microport Longmai Medical Equipment Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2022-06-03

Abstract

The invention provides a catheter which is used for conveying a balloon and a stent and comprises a catheter body and a supporting component, wherein the supporting component is arranged at the far end of the catheter body and can release or retract a supporting piece, and the supporting piece can be attached to the inner wall of a blood vessel to provide supporting force for the catheter so that the stent can be stably placed. During balloon expansion, the support assembly provides sufficient support force to the catheter to prevent the catheter from shifting during balloon expansion. In addition, the bend-controlling assembly is capable of bending to change the orientation of the distal-most end of the catheter. The catheter can be bent into different angles according to the actual blood vessel condition, the function of repeated bending adjustment can be realized, the operation difficulty of the cardiovascular interventional operation can be reduced, and the time consumed by the catheter reaching the cardiovascular pathological change part is reduced.

Description

Catheter tube

Technical Field

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

Background

Cardiovascular diseases have gradually become a large disease threatening human health, and the incidence and mortality of cardiovascular diseases are high. Cardiovascular diseases include cardiovascular stenosis, and cardiovascular interventional surgery has become an important treatment for cardiovascular stenosis at present. As a key instrument in cardiovascular interventional operations, the catheter provides a channel for conveying other instruments such as a balloon and a stent, and plays an important role in success of the operations.

Because in the process of balloon expansion, the catheter is influenced by the reacting force of the balloon and can be separated from the position, the catheter and the balloon are further caused to slide, the stent cannot be correctly molded at the narrow part of the blood vessel due to the sliding of the balloon, and even the stent falls off, so that great risk is brought to a patient.

In addition, the catheter may be difficult to access the lesion due to cardiovascular variability of the patient, as well as the presence of partially tortuous lesions. Therefore, a catheter which can provide enough supporting force during the operation of the balloon, can be bent according to the actual situation of the cardiovascular system and can realize repeated bending in the cardiovascular system is desired in the industry.

Disclosure of Invention

The invention aims to provide a catheter which can provide enough supporting force during the expansion process of a balloon so as to prevent the catheter from sliding during the expansion process of the balloon.

In order to achieve the above object, the present invention provides a catheter for delivering a balloon and a stent, the catheter comprising a catheter body and a support assembly, the support assembly being disposed at a distal end of the catheter body;

the far end of the supporting component can release or withdraw a supporting piece, and the supporting piece is attached to the inner wall of the blood vessel when in a release state so as to support the catheter.

Optionally, the support member is flared when in the released state, and the support member is cylindrical when in the retracted state.

Optionally, the support member is provided with a through-flow hole.

Optionally, the shape of the through-flow hole is circular or square.

Optionally, the distal end of the catheter body is provided with a protrusion, and the support assembly further comprises:

the first elastic ring is sleeved on the protruding part, the near end of the first elastic ring is fixedly connected with the far end of the catheter body, the inner circumferential surface of the first elastic ring is attached to the outer circumferential surface of the protruding part, the length of the first elastic ring is larger than that of the protruding part, and a first cavity is formed in the side wall of the first elastic ring along the axial direction of the catheter body;

the permanent magnet is accommodated in the first hole cavity and can move in the first hole cavity along the axial direction of the catheter;

the iron ring is fixedly connected with the permanent magnet and arranged at the far end of the first elastic ring, and the permanent magnet drives the iron ring to move so that the first elastic ring can contract or expand along the axial direction of the catheter body;

the electromagnet is arranged in the distal end of the catheter body, at least partially aligns with the proximal end of the first lumen, and can drive the permanent magnet to move;

the proximal end of the support member is fixedly connected with the distal end of the protruding portion and/or the distal end of the catheter body, the distal end of the support member is attached to the distal end of the first elastic ring, when the first elastic ring is in a contracted state, the support member is released, and when the first elastic ring is in an expanded state, the support member is recovered.

Optionally, the number of the first bores is at least two.

Optionally, the electromagnet can be connected to a power supply through a wire, the proximal end of the electromagnet is connected to the distal end of the wire, the proximal end of the wire is connected to the power supply, and the power supply supplies power to the electromagnet through the wire.

Optionally, a second lumen is axially formed in the wall of the catheter body, and the guide wire is accommodated in the second lumen.

Optionally, the iron ring further comprises an elastic cover, the elastic cover is located at the far end of the supporting component and is used for covering the iron ring.

Optionally, the catheter further comprises: accuse curved subassembly, accuse curved subassembly includes:

the bending control knob is arranged at the proximal end of the catheter body and can rotate;

the inner circumferential surface of the far end of the catheter body is provided with a concave ring groove, and the second elastic ring is accommodated in the concave ring groove of the inner circumferential surface;

and the far end of the wire drawing is connected with the far end of the catheter body, the near end of the wire drawing is connected with the bending control knob, the bending control knob rotates to drive the wire drawing, and the wire drawing can drive the second elastic ring to bend so as to bend the far end of the catheter body.

Optionally, a third hole cavity is axially formed in the tube wall of the catheter body, and the drawn wire is accommodated in the third hole cavity.

Optionally, the bending control knob penetrates through a side wall of the sleeve, extends to the third lumen, and is connected with the wire drawing.

Optionally, the support, the first elastic ring, the second elastic ring and the elastic cover are made of TPE.

Optionally, the pipe body includes pipe inlayer and pipe skin, the outer cover of pipe is located outside the pipe inlayer, just the outer inner wall of pipe with the outer wall laminating of pipe inlayer, the second vestibule with the third vestibule set up in the pipe inlayer.

Optionally, the material of the outer conduit layer, the inner conduit layer and the sleeve is polyamide polyether block copolymer.

Optionally, the outer layer of the catheter is a braided tube.

Optionally, a first developing mark and a second developing mark are arranged on the outer layer of the catheter corresponding to the second elastic ring.

Optionally, the first developing mark corresponds to a position where the drawn wire is connected to the catheter body, and an included angle between a virtual connection line between the first developing mark and the center of the catheter body and a virtual connection line between the second developing mark and the center of the catheter body is 90 degrees.

In the catheter provided by the invention, the distal end of the catheter body is connected with the proximal end of the support component, the support component can release or retract a support piece, and the support piece can be attached to the inner wall of the blood vessel when in a release state so as to provide a supporting force for the catheter. The support component can provide enough support force for the catheter during the expansion of the balloon, and the catheter is prevented from sliding during the expansion of the balloon.

In addition, the catheter body further comprises a bending control assembly, and the bending control assembly can be bent to change the orientation of the far end of the catheter body, so that the catheter can be bent into different angles according to actual blood vessel conditions, and the function of repeated bending adjustment can be realized.

In addition, the outer layer of the conduit is provided with a first developing mark and a second developing mark corresponding to the position of the second elastic ring, so that the bending condition of the conduit can be conveniently identified.

Drawings

FIG. 1 is a first schematic view of a catheter in an embodiment of the invention;

FIG. 2 is a second schematic view of a catheter in an embodiment of the invention;

FIG. 3 is a schematic view of a support member in an embodiment of the invention;

FIG. 4 is a cross-sectional view of the proximal end of the catheter body in an embodiment of the present invention;

FIG. 5 is a schematic view of a support member of a catheter in a retracted state according to an embodiment of the present invention;

FIG. 6 is a schematic view of a catheter in an embodiment of the invention with the support member released;

FIG. 7 is a third schematic view of a catheter in an embodiment of the invention;

FIG. 8 is a cross-sectional view of the distal end of the catheter body in an embodiment of the present invention;

FIG. 9 is a schematic representation of a catheter within a blood vessel in an embodiment of the present invention;

wherein the reference numbers are as follows:

1000-a catheter; 1100-a support assembly; 1110-a support member; 1111-through flow holes; 1120-elastic cover; 1130-a first elastic ring; 1140-iron ring; 1150-permanent magnet; 1160-an electromagnet; 1170-conducting wires; 1180-a first bore; 1200-a catheter body; 1210-a projection; 1₂₂₀-a catheter inner layer; 1₂₂₁-a second bore; 1₂₂₂-a third bore; 1₂₃0-the outer layer of the catheter; 1₂₃₁-a first developed mark; 1₂₃₂-a second developed mark; 1300-bending control assembly; 1310-a second elastic ring; 1320-wire drawing; 1330-bending control knob;

2000-power supply;

3000-cannula.

Detailed Description

The following describes in more detail embodiments of the present invention with reference to the schematic drawings. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

The definitions of "proximal" and "distal" herein are: "proximal" generally refers to the end of the medical device that is near the operator during normal operation, while "distal" generally refers to the end of the medical device that first enters the patient during normal operation.

Cardiovascular interventional surgery has become an important treatment for cardiovascular stenosis. As a key instrument in cardiovascular interventional operations, the catheter provides a channel for conveying other instruments such as a balloon and a stent, and plays an important role in success of the operations. After a body surface blood vessel is punctured, the saccule is sent to a lesion part, namely a cardiovascular stenosis part, then the saccule is expanded, the expanded saccule drives the stent sleeved outside the saccule to be opened, and the cardiovascular of the lesion part is stretched by the stent. Then the balloon is contracted, the catheter and the balloon are withdrawn, and the cardiovascular interventional operation is completed.

In the process of balloon expansion, the catheter is affected by the balloon reaction force and can be separated from the position, so that the catheter and the balloon slide, the balloon slides, the stent cannot be correctly molded at the narrow part of the blood vessel, and even the stent falls off, and huge risks are brought to a patient. Meanwhile, due to the cardiovascular variability of patients or the cardiovascular disease of patients with partial tortuous lesions, the catheter needs to be capable of bending according to the actual condition of the cardiovascular disease so as to facilitate the catheter to reach the angiostenosis.

In this regard, the present embodiments provide a catheter that can be steered and provide support for the delivery of balloons as well as stents.

Fig. 1 is a first schematic view of the catheter in this embodiment, and fig. 2 is a second schematic view of the catheter in this embodiment. As shown in fig. 1 and 2, a catheter 1000 that can steer and provide support includes a catheter body 1200 and a support assembly 1100. The distal end of the support member 1100 is capable of releasing or retracting the support member 1110, the support member 1110 is engaged with the inner wall of the blood vessel when in the released state, and the engagement of the support member 1110 with the inner wall of the blood vessel enables the support member 1100 to provide a supporting force to support the catheter 1000. The problem that the catheter 1000 and the balloon slide due to the fact that the catheter 1000 is separated from the position under the influence of the reaction force of the balloon in the balloon inflation process is solved. Thereby, the bracket is stably placed.

Further, the supporting member 1110 is in a horn shape when in a release state, and the supporting member 1110 is in a cylindrical shape when in a retraction state. When the support 1110 is in the released state, the support 1110 is not constrained by the support assembly 1100. The support member 1110 is made of an elastic material, such that the support member 1110 expands in a flared shape (also understood as an umbrella shape) when in a released state. The outer edge of the expanded support member 1110 conforms to the inner wall of the cardiovascular vessel, and the resulting support force keeps the support member 1110 and the support assembly 1100 stationary relative to the cardiovascular vessel. The function of the support 1110 to support the catheter 1000 is achieved.

In the present embodiment, the material of the supporting member 1110 is TPE. The TPE is a thermoplastic elastomer material, has the characteristics of high strength, high resilience and injection molding processing, and is environment-friendly, nontoxic, safe and soft in touch. It should be understood that the material of the supporting member 1110 can be selected from known elastic materials according to the needs of those skilled in the art, and is not limited herein.

Fig. 3 is a schematic view of the supporting member in this embodiment. As shown in fig. 3, the supporting member 1110 is provided with a plurality of through holes 1111. It will be appreciated that the support member 1110, when expanded, will engage the inner wall of the cardiovascular vessel, which may undesirably prevent blood flow within the cardiovascular vessel. Therefore, the supporting member 1110 is provided with a plurality of through-holes 1111 through which blood can flow, and the supporting member 1110 does not block the blood flow in the cardiovascular system even when the supporting member 1110 is in the expanded state.

Further, the through-hole 1111 has a circular or square shape. It should be understood that the shape of the through-flow hole 1111 may be changed according to the experience of those skilled in the art, and is not limited thereto, if the blood flow is facilitated.

Fig. 4 is a cross-sectional view of the proximal end of the catheter body in this embodiment. As shown in fig. 4, the catheter body comprises a catheter inner layer 1220 and a catheter outer layer 1230, the catheter outer layer 1230 is sleeved outside the catheter inner layer 1220, and the inner wall of the catheter outer layer 1230 is attached to the outer wall of the catheter inner layer 1220. It should be appreciated that the catheter outer layer 1230 is an interference fit with the catheter inner layer 1220 such that no slippage occurs between the catheter outer layer 1230 and the catheter inner layer 1220. It will be appreciated by those skilled in the art that the catheter body may be provided in a single layer or multiple layers depending on the stiffness requirements of the catheter 1000.

Optionally, the material of the catheter outer layer 1230 and the catheter inner layer 1220 is polyamide polyether block copolymer.

Further, the catheter outer layer 1230 is a braided tube. The middle of the outer layer 1230 of the catheter is a stainless steel wire double-strand winding woven layer, and the inside and the outside of the woven layer are wrapped with polyamide polyether block copolymer. Based on this, the outer tube has stronger rigidity, is favorable to the operator to promote the pipe 1000 in the process of operation.

Fig. 5 is a schematic view of the support member of the catheter in the present embodiment in a retracted state, and fig. 6 is a schematic view of the support member of the catheter 1000 in the present embodiment in a released state. As shown in fig. 5 and 6, the supporting assembly 1100 includes a first elastic ring 1130, a permanent magnet 1150, an iron ring 1140, an electromagnet 1160 and a supporter 1110. The far end of the catheter body is provided with a ring groove from outside to inside along the radial direction. As such, the distal end of the catheter body forms the projection 1210.

In another embodiment of this embodiment, the catheter body is formed of a catheter inner layer 1220 and a catheter outer layer 1230, and the catheter outer layer 1230 is removed from the distal end of the catheter 1000, leaving a portion of the catheter inner layer 1220 such that the distal end of the catheter inner layer 1220 forms the projection 1210.

The first elastic ring 1130 is sleeved on the protruding portion 1210, a proximal end of the first elastic ring 1130 is fixedly connected with a distal end of the catheter body, an inner circumferential surface of the first elastic ring 1130 is attached to an outer circumferential surface of the protruding portion 1210, the length of the first elastic ring 1130 is greater than that of the protruding portion 1210, and a plurality of first cavities 1180 are formed in a side wall of the first elastic ring 1130 in the axial direction of the catheter 1000. The permanent magnet 1150 is accommodated in the first bore 1180 and can move in the first bore 1180 along the axial direction of the catheter body, the iron ring 1140 is fixedly connected with the permanent magnet 1150 and is arranged at the distal end of the first elastic ring 1130, the electromagnet 1160 can drive the permanent magnet 1150 and the iron ring 1140 to move, so that the first elastic ring 1130 can contract or expand along the axial direction of the catheter body, and the electromagnet 1160 is arranged in the distal end of the catheter body. The distal end of the electromagnet 1160 is at least partially aligned with the proximal end of the first bore 1180, and the distal end of the electromagnet 1160 corresponds to the first bore 1180.

With continued reference to fig. 5 and 6, the proximal end of the support member 1110 is fixedly attached to the distal end of the projection 1210 or the distal end of the catheter body, and in an alternative embodiment, the proximal end of the support member 1110 is fixedly attached to the distal end of the projection 1210 and the distal end of the catheter body, such that the support member 1110 is more securely attached to the catheter body. The distal end of the support 1110 abuts the distal end of the first elastic ring 1130 such that the distal end of the support 1110 is constrained by the distal end of the first elastic ring 1130 and the iron ring 1140. When the first elastic ring 1130 is in an extended state, the distal end of the first elastic ring 1130 and the iron ring 1140 bind the support 1110, and the support 1110 is retracted, and at this time, the support 1110 is cylindrical. Because the length of the first elastic ring 1130 is greater than that of the protruding portion 1210, the first elastic ring 1130 is partially attached to the protruding portion 1210 and partially attached to the supporting member 1110, and the protruding portion 1210 can limit the first elastic ring 1130 from excessively contracting inwards, so that the supporting member 1110 is excessively restrained, and the supporting member 1110 can be prevented from deforming, which is beneficial to the fact that the supporting member 1110 can expand to form an original shape (i.e., a trumpet shape) when not restrained. When the first elastic ring 1130 is in a contracted state, the distal end of the first elastic ring 1130 and the iron ring 1140 do not bind the support member 1110, and the support member 1110 is released, and at this time, the support member 1110 expands to form a trumpet shape (which can also be understood as an umbrella shape).

In one embodiment, the number of the first bores 1180 is one, and the cross section of the first bores 1180 is circular.

In yet another embodiment, the number of the first cavities 1180 is at least two, and the first cavities 1180 are circumferentially and uniformly distributed in the side wall of the first elastic ring 1130.

Further, the catheter 1000 further comprises a guidewire 1170 and a power source 2000.

With continued reference to fig. 1, 5, and 6, the electromagnet 1160 is coupled at a proximal end to the wire 1170, the wire 1170 is coupled at a distal end to the power source 2000, and the power source 2000 provides power to the electromagnet 1160 via the wire 1170. When the electromagnet 1160 is powered on, a magnetic field is generated to drive the permanent magnet 1150 to move. When the electromagnet 1160 is powered off, the magnetic field disappears, the first elastic ring 1130 stretches to restore the original state, and the iron ring 1140 and the permanent magnet 1150 are driven to return to the original position state.

Further, a second bore 1221 is axially formed in a wall of the catheter body 1200, and the wire 1170 is accommodated in the second bore 1221.

Further, the support assembly 1100 further includes an elastic cover 1120.

With reference to fig. 5 or 6, the elastic cover 1120 is located at the distal end of the support assembly 1100 for covering the iron ring 1140. It will be appreciated that as the catheter 1000 is moved within a blood vessel, the iron ring 1140 at the distal end of the support assembly 1100 can snag against the blood vessel, which can lead to injury to the inner wall of the blood vessel, which is undesirable. Thus, a flexible cover 1120 is provided at the distal end of the support member 1100, and the flexible cover 1120 is soft and does not scratch the inner wall of the blood vessel.

Optionally, the material of the first elastic ring 1130 and the elastic cover 1120 is TPE. It should be understood that the materials of the first elastic ring 1130 and the elastic cover 1120 can also be selected from known elastic materials according to the needs of those skilled in the art, and are not limited herein.

Fig. 7 is a third schematic view of the catheter in this embodiment. The catheter 1000 is bent as shown in fig. 7. The catheter 1000 further comprises a bending control assembly 1300, the distal end of the bending control assembly 1300 is connected with the proximal end of the support assembly 1100, and the bending control assembly 1300 can be bent and straightened to adjust the bending angle of the catheter body, so that the catheter 1000 has the function of repeatedly bending and can be adjusted into various forms. In an exemplary embodiment, when the catheter 1000 enters a tortuous cardiovascular condition, the catheter 1000 can be adapted to the tortuous cardiovascular condition by adjusting the bending control assembly 1300 to bend the catheter 1000 into different configurations according to the actual cardiovascular condition of the patient, thereby facilitating the catheter 1000 to enter the cardiovascular condition. It will be appreciated that the bend-controlling assembly 1300 is resilient and bendable, such that the catheter 1000 may be repeatedly bent within a cardiovascular system via the bend-controlling assembly 1300. The difficulty of the cardiovascular intervention operation can be reduced, and the time taken for the catheter 1000 to reach the cardiovascular lesion is reduced.

Further, the bending control assembly 1300 includes a bending control knob 1330, a second elastic ring 1310, and a pull 1320.

Fig. 8 is a sectional view of the distal end of the catheter body in the present embodiment, and fig. 9 is a schematic view of the catheter in the present embodiment inside a blood vessel. As shown in fig. 4, 5, 8 and 9, the bending control knob 1330 is disposed at the proximal end of the catheter body and is capable of rotating. The inner circumferential surface of the distal end of the catheter body is provided with a concave groove, the concave groove is positioned behind the proximal end of the protruding part 1210, and the second elastic ring 1310 is accommodated in the concave groove of the inner circumferential surface. It should be noted that the catheter body itself has a certain elasticity, but the elasticity of the catheter body itself is not enough to support the catheter body to be straightened, and the second elastic ring 1310 has a better elasticity, so that when the distal end of the catheter body is bent, the distal end of the catheter body can be restored to the original shape due to the second elastic ring 1310 to maintain the straightened state. The distal end of the pull wire 1320 is connected to the distal end of the catheter body 1200, the proximal end of the pull wire 1320 is connected to the bending control knob 1330, the bending control knob 1330 rotates to drive the pull wire 1320, and the pull wire 1320 can drive the catheter and the second elastic ring 1310 to bend. The more turns the bend control knob 1330 rotates when the pull wire 1320 pulls the distal end of the catheter body 1200 to compress the second resilient ring 1310 for bending, the greater the angle the catheter body bends. After the bending control knob 1330 is turned, the pull wire 1320 is loosened, the pulling force of the pull wire 1320 on the catheter body 1200 is reduced, and the bent angle of the catheter body 1200 is reduced or even restored to the straightened state due to the resilience of the second elastic ring 1310. Thereby, the function of the catheter 1000 capable of repeated bending is realized.

With continued reference to fig. 4, a third bore 1222 is axially formed in the wall of the catheter body 1200, and the pull wire 1320 is received in the third bore 1222. In another embodiment of this embodiment, the catheter body 1200 is comprised of an inner catheter layer 1220 and an outer catheter layer 1230, with the second lumen 1221 and the third lumen 1222 disposed in the inner catheter layer 1220. It should be understood that the number of the second bore 1221 and the third bore 1222 may be one or more, and is not limited herein.

Further, the angle between the virtual line connecting the second lumen 1221 and the center of the catheter body 1200 and the virtual line connecting the third lumen 1222 and the center of the catheter body 1200 may be any angle, and preferably, the angle is 90 degrees.

Optionally, catheter 1000 further comprises a sleeve 3000.

With continued reference to fig. 4, disposed at the proximal end of the catheter body 1200 and sleeved outside the catheter body 1200, the bending control knob 1330 passes through the sidewall of the sleeve 3000 and extends to the third bore 1222 in the catheter body 1200, and connects to the pull wire 1320. It should be appreciated that the sleeve 3000 can provide a stronger connection between the turn control knob 1330 and the proximal end of the catheter body 1200, and can also facilitate the rotation of the turn control knob 1330. As a preferred embodiment, the material of the sleeve 3000 is a polyamide polyether block copolymer.

With reference to fig. 1, the catheter outer layer 1230 is provided with a first visualized mark 1231 and a second visualized mark 1232 at positions corresponding to the second elastic ring 1310. As an exemplary embodiment, a developing solution is provided in the first and second development marks 1231 and 1232, so that an operator can more clearly recognize the bending of the catheter 1000 through the first and second development marks 1231 and 1232. The operation of the operation is convenient to reduce the operation time.

Further, the first visualization mark 1231 corresponds to a position where the drawing 1320 is connected to the catheter, and an included angle between a virtual connection line between the first visualization mark 1231 and the center of the catheter body and a virtual connection line between the second visualization mark 1232 and the center of the catheter body is 90 degrees. In this manner, the bending of the catheter 1000 can be more easily identified by the operator.

In summary, the catheter provided in the embodiments of the present invention includes a catheter support assembly and a curve control assembly, wherein a distal end of the curve control assembly is connected to a proximal end of the support assembly. The far end of the supporting component can release or withdraw a supporting piece, the supporting piece is attached to the inner wall of the blood vessel when in a release state, and the supporting piece is attached to the inner wall of the blood vessel, so that the supporting component can provide a supporting force to support the catheter. The problem of in the sacculus inflation process, the pipe can break away from the position that locates to the influence of sacculus reaction force, causes pipe and sacculus to appear sliding is solved. Thereby, the bracket is stably placed. The accuse curved subassembly can be crooked and straighten to the adjustment the bend angle of pipe makes the pipe possesses the function of transferring the curve repeatedly, and lets the pipe can be adjusted to multiple form. The operation difficulty of the cardiovascular interventional operation can be reduced, and the time for the catheter to reach the cardiovascular pathological part is reduced.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A catheter for delivering a balloon and a stent, comprising: the catheter comprises a catheter body and a support assembly, wherein the support assembly is arranged at the distal end of the catheter body;

the distal end of the support component can release or retract a support piece, and the support piece is attached to the inner wall of the blood vessel when in a release state so as to support the catheter.

2. The catheter of claim 1, wherein the support member flares when in a released state and the support member is cylindrical when in a retracted state.

3. The catheter of claim 1, wherein the support member defines a flow aperture therein.

4. Catheter according to claim 1, characterized in that the shape of the through-flow hole is circular or square.

5. The catheter of claim 1, wherein the distal end of the catheter body is provided with a projection, the support assembly further comprising:

the first elastic ring is sleeved on the protruding part, the near end of the first elastic ring is fixedly connected with the far end of the catheter body, the inner circumferential surface of the first elastic ring is attached to the outer circumferential surface of the protruding part, the length of the first elastic ring is larger than that of the protruding part, and a first hole cavity is formed in the side wall of the first elastic ring along the axial direction of the catheter body;

a permanent magnet accommodated in the first lumen and movable in the first lumen in an axial direction of the catheter;

6. The catheter of claim 5, wherein the first lumen is at least two in number.

7. The catheter of claim 5, further adapted to be connected to a power source via a wire, wherein the proximal end of the electromagnet is connected to the distal end of the wire, wherein the proximal end of the wire is connected to the power source, and wherein the power source powers the electromagnet via the wire.

8. The catheter as claimed in claim 7, wherein the catheter body has a second lumen axially defined in a wall thereof, and the guide wire is received in the second lumen.

9. The catheter of claim 8, further comprising a resilient cover at the distal end of the support assembly for covering the eyelet.

10. The catheter of claim 1, further comprising: accuse curved subassembly, accuse curved subassembly includes:

11. The catheter as claimed in claim 10, wherein the wall of the catheter body is provided with a third axial hole, and the wire is accommodated in the third axial hole.

12. The catheter of claim 11, further comprising a sleeve disposed at the proximal end of the catheter body and sleeved outside the catheter body, wherein the curve control knob passes through a sidewall of the sleeve and extends to the third lumen to connect with the pull wire.

13. The catheter of claim 1 or claim 5 or claim 9 or claim 10, wherein the material of the support, the first resilient ring, the second resilient ring and the resilient cover is TPE.

14. The catheter of any one of claims 1-12, wherein the catheter body comprises an inner catheter layer and an outer catheter layer, the outer catheter layer is sleeved outside the inner catheter layer, the inner wall of the outer catheter layer is attached to the outer wall of the inner catheter layer, and the second lumen and the third lumen are disposed in the inner catheter layer.

15. Catheter according to claim 14, wherein the material of the outer catheter layer, the inner catheter layer and the sleeve is a polyamide polyether block copolymer.

16. Catheter according to claim 14, wherein the outer catheter layer is a braided tube.

17. The catheter of claim 14, wherein the catheter outer layer is provided with a first visualization mark and a second visualization mark at locations corresponding to the second elastic ring.

18. The catheter of claim 17, wherein the first visualization marker corresponds to a location where the pull wire is attached to the catheter body, and an angle between a virtual line connecting the first visualization marker and a center of the catheter body and a virtual line connecting the second visualization marker and the center of the catheter body is 90 degrees.