Balloon dilatation catheter

Abstract

The invention relates to the technical field of medical apparatus and instruments, and discloses a balloon dilatation catheter which comprises an inner tube, an outer tube, a balloon and a rotating adapter. And the outer pipe sleeves the outer side of the inner pipe. The balloon sleeves the outer side of the far end of the inner tube, the far end of the balloon is connected and sealed with the far end of the inner tube, and the near end of the balloon is connected with the far end of the outer tube. The rotating adapter sleeves the outer side of the near end of the inner tube, the far end of the rotating adapter is connected with the near end of the outer tube, the rotating adapter is used for driving the outer tube to rotate relative to the inner tube, and the balloon is suitable for rotating relative to the inner tube under the driving of the outer tube and forming a torsional folding state. After pressure relief of the balloon is completed, the near end of the balloon can be driven to rotate relative to the far end by rotating the adapter and the outer tube until the balloon is in a twisted folded state, the balloon in the twisted folded state can reduce the outer diameter of the balloon to a great extent, the operation difficulty of withdrawing the balloon is reduced, and damage to the blood vessel wall when the balloon is withdrawn is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a balloon dilatation catheter. BACKGROUND

[0002] The balloon dilatation catheter is a medical interventional device composed of a balloon, a catheter, a catheter seat and a guide wire, and is widely used in interventional surgeries such as cardiovascular intervention, digestive tract stenosis treatment and peripheral vascular intervention. In the related technology, the balloon is inflated and expanded after being placed and reaching the target position of the blood vessel, so as to dilate the stenosis. After the balloon completes the expansion, it needs to be deflated and contracted, and then withdrawn out of the body. However, the shape of the balloon after deflation is irregular, and the balloon cannot be contracted to the state before expansion. The deflated balloon is usually a two-piece structure, so that the overall outer diameter of the balloon is relatively large, which is not conducive to withdrawing the balloon, and the withdrawal of the balloon in this state can easily damage the blood vessel wall. SUMMARY

[0003] Therefore, the present application provides a balloon dilatation catheter to reduce the outer diameter of the balloon after deflation, reduce the operation difficulty of withdrawing the balloon, and avoid damaging the blood vessel wall when the balloon is withdrawn.

[0004] The present application provides a balloon dilatation catheter, comprising:

[0005] an inner tube;

[0006] an outer tube sleeved outside the inner tube;

[0007] a balloon sleeved outside the distal end of the inner tube, the distal end of the balloon being connected and sealed with the distal end of the inner tube, the proximal end of the balloon being connected with the distal end of the outer tube, the inner wall of the balloon and the outer wall of the inner tube having a filling cavity therebetween, and the inner wall of the outer tube and the outer wall of the inner tube having a filling cavity in communication with the filling cavity;

[0008] a rotating adapter sleeved outside the proximal end of the inner tube, the distal end of the rotating adapter being connected with the proximal end of the outer tube, the rotating adapter being used to drive the outer tube to rotate relative to the inner tube, and the balloon being adapted to rotate relative to the inner tube under the driving of the outer tube and form a twisted and folded state.

[0009] Optionally, the balloon dilatation catheter further comprises:

[0010] a catheter seat provided with a guide wire cavity and a first mounting hole, the inner tube passing through the first mounting hole and being in communication with the guide wire cavity, and the outer wall of the inner tube being fixedly connected with the first mounting hole.

[0011] Optionally, the rotating adapter comprises:

[0012] The connecting sleeve is provided with a connecting hole, and a proximal end of the connecting hole is sleeved on a distal end of the catheter seat;

[0013] The rotating member is provided with a through hole, the rotating member is sleeved on an outer side of the proximal end of the inner tube through the through hole, a distal end of the rotating member is fixedly connected with the proxal end of the outer tube, a proximal end of the rotating member is rotationally arranged at the distal end of the connecting hole, and an axial limiting structure is arranged between the proximal end of the rotating member and the distal end of the connecting hole, the axial limiting structure is used for limiting relative movement of the rotating member and the connecting portion in an axial direction.

[0014] Optionally, the connecting hole is a stepped hole, including a first inner hole and a second inner hole, an inner diameter of the first inner hole is greater than an inner diameter of the second inner hole, the first inner hole is located at the proximal end of the connecting hole and is sleeved on the distal end of the catheter seat, and the second inner hole is located at the distal end of the connecting hole.

[0015] The proximal end of the rotating member is provided with a first core body, the through hole penetrates the first core body, the first core body passes through the second inner hole and extends into the first inner hole, and the rotating member abuts against the distal end of the connecting sleeve.

[0016] The axial limiting structure includes a stepped surface between the first inner hole and the second inner hole, and a protrusion arranged on an outer wall of the first core body, and the protrusion abuts against the stepped surface.

[0017] Optionally, the distal end of the rotating member is provided with a second core body, the through hole penetrates the second core body, the second core body extends into a space between an outer wall of the proximal end of the inner tube and an inner wall of the proximal end of the outer tube, and the second core body is connected with the inner wall of the proximal end of the outer tube.

[0018] The outer wall of the first core body is in abutment with the second inner hole; and / or,

[0019] A sealing ring is arranged between the outer wall of the first core body and the second inner hole.

[0020] Optionally, the catheter seat includes a first inner cavity arranged at a distal end of the guide wire cavity, a side wall of the catheter seat is provided with a filling port in communication with the first inner cavity, and the first mounting hole is located between the first inner cavity and a second inner cavity; the catheter seat further includes a second mounting hole, the second mounting hole penetrates the distal end of the catheter seat and the first inner cavity, the inner tube passes through the second mounting hole, the first inner cavity and the first mounting hole and is in communication with the guide wire cavity, the second mounting hole is in communication with the through hole, an inner diameter of the second mounting hole is greater than an outer diameter of the inner tube, and an inner diameter of the through hole is greater than the outer diameter of the inner tube.

[0021] Optionally, the distal end of the catheter seat is provided with a convex part, the first inner hole sleeve is sleeved on the convex part, the convex part is provided with a necked part in communication with the second mounting hole, and the outer wall of the proximal end of the first core body is matched with the shape of the necked part.

[0022] Optionally, the outer wall of the balloon is a smooth arc surface, or a plurality of score members are uniformly arranged on the outer wall of the balloon in the circumferential direction, and the score members extend in the axial direction of the balloon.

[0023] Optionally, one end of the score member away from the balloon is a pointed end, and first and second elastic walls are arranged on the opposite sides of the score member, respectively, one end of each of the first and second elastic walls is connected to the balloon, and the other end of each of the first and second elastic walls is slidably attached to the surface of the opposite side of the score member.

[0024] In the inflated state of the balloon, the other end of each of the first and second elastic walls moves away from the pointed end, and in the deflated state of the balloon, the other end of each of the first and second elastic walls moves towards the pointed end.

[0025] Optionally, a first channel is formed between the surface of the first elastic wall and the side wall of the score member, and a second channel is formed between the surface of the second elastic wall and the side wall of the score member.

[0026] Advantages:

[0027] The balloon dilatation catheter provided by the application comprises an inner tube, an outer tube, a balloon and a rotating adapter. The outer tube is sleeved outside the inner tube. The balloon is sleeved outside the distal end of the inner tube, the distal end of the balloon is connected to and sealed with the distal end of the inner tube, the proximal end of the balloon is connected to the distal end of the outer tube, a filling cavity is formed between the inner wall of the balloon and the outer wall of the inner tube, and a filling cavity in communication with the filling cavity is formed between the inner wall of the outer tube and the outer wall of the inner tube. The rotating adapter is sleeved outside the proximal end of the inner tube, the distal end of the rotating adapter is connected to the proximal end of the outer tube, the rotating adapter is used to drive the outer tube to rotate relative to the inner tube, and the balloon is adapted to rotate relative to the inner tube under the driving of the outer tube and form a twisted and folded state.

[0028] During use, the balloon is pushed to the target location on the blood vessel through the outer and inner tubes. Then, the inflation chamber is inflated through the filling chamber, causing the balloon to expand and dilate the narrowed area of ​​the blood vessel. After the balloon has fully expanded, the pressure in the inflation chamber is released through the filling chamber, causing the balloon to contract. After decompression, the outer tube can be rotated relative to the inner tube by rotating the adapter. Because the proximal end of the balloon is connected to the distal end of the outer tube, and the distal end of the balloon is connected to the distal end of the inner tube, the outer tube can rotate the proximal end of the balloon relative to the distal end until the balloon forms a torsional fold. This torsional fold significantly reduces the outer diameter of the balloon, making balloon withdrawal easier and preventing damage to the blood vessel wall during withdrawal. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the balloon dilation catheter according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the balloon in a twisted and folded state according to an embodiment of the present invention;

[0032] Figure 3 This is a side view of the balloon dilation catheter according to an embodiment of the present invention;

[0033] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of a medium-sized balloon dilation catheter;

[0034] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0035] Figure 6 This is a schematic diagram showing the connection relationship between the balloon, inner tube, and outer tube according to an embodiment of the present invention;

[0036] Figure 7 This is a cross-sectional structural diagram of the catheter seat according to an embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of another embodiment of the balloon dilation catheter of the present invention;

[0038] Figure 9 This is a schematic diagram of another embodiment of the balloon of the present invention;

[0039] Figure 10 Structure diagram of the scoring member, the first elastic wall and the second elastic wall in another state of the embodiment of the present application.

[0040] Figure 11 Structure diagram of the scoring member, the first elastic wall and the second elastic wall in another state of the embodiment of the present application.

[0041] Legend of reference signs:

[0042] 1, inner tube; 11, tube head; 2, outer tube; 3, balloon; 31, inflation cavity; 32, filling cavity; 33, scoring member; 331, first elastic wall; 3311, first channel; 332, second elastic wall; 3321, second channel; 4, rotating adapter; 41, connecting sleeve; 411, first inner hole; 412, second inner hole; 413, step surface; 42, rotating member; 421, through hole; 422, first core; 4221, protrusion; 423, second core; 43, sealing ring; 5, catheter seat; 51, guide wire cavity; 511, first mounting hole; 52, first inner cavity; 521, inflation port; 522, second mounting hole; 53, convex part; 531, necked part; 54, inflation connector. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0044] As shown in FIGS. Figure 1 , Figure 2 , Figure 3 and Figure 4 , the present embodiment provides a balloon dilatation catheter, which comprises:

[0045] an inner tube 1;

[0046] an outer tube 2 sleeved outside the inner tube 1;

[0047] a balloon 3 sleeved outside the distal end of the inner tube 1, the distal end of the balloon 3 being connected and sealed with the distal end of the inner tube 1, the proximal end of the balloon 3 being connected with the distal end of the outer tube 2, the inner wall of the balloon 3 and the outer wall of the inner tube 1 having an inflation cavity 31 therebetween, the inner wall of the outer tube 2 and the outer wall of the inner tube 1 having a filling cavity 32 in communication with the inflation cavity 31;

[0048] The rotating adapter 4 is sleeved on the outer side of the proximal end of the inner tube 1, the distal end of the rotating adapter 4 is connected with the proximal end of the outer tube 2, the rotating adapter 4 is used to drive the outer tube 2 to rotate relative to the inner tube 1, and the balloon 3 is adapted to rotate relative to the inner tube 1 under the driving of the outer tube 2 and form a twisted and folded state.

[0049] In use, the balloon 3 can be pushed to a target position in a blood vessel through the outer tube 2 and the inner tube 1, then the inflation cavity 31 is pressurized through the filling cavity 32, so that the balloon 3 expands and dilates a stenosis of the blood vessel. After the balloon 3 completes the dilation, the balloon 3 can be deflated by depressurizing the inflation cavity 31 through the filling cavity 32, so that the balloon 3 shrinks. After the deflation of the balloon 3 is completed, the outer tube 2 can be driven to rotate relative to the inner tube 1 through the rotating adapter 4. Since the proximal end of the balloon 3 is connected with the distal end of the outer tube 2 and the distal end of the balloon 3 is connected with the distal end of the inner tube 1, the outer tube 2 can drive the proximal end of the balloon 3 to rotate relative to the distal end until the balloon 3 forms a twisted and folded state. The balloon 3 in the twisted and folded state can greatly reduce the outer diameter of the balloon 3, reduce the difficulty of the operation of withdrawing the balloon 3, and avoid damaging the blood vessel wall when the balloon 3 is withdrawn.

[0050] It should be noted that the proximal end and the distal end in the embodiment are defined according to the distance between the corresponding structure and the operator, the end close to the operator is defined as the proximal end, and the end away from the operator is defined as the distal end. In addition, the twisted and folded state refers to a spiral posture formed by rotating the proximal end of the balloon 3 relative to the distal end of the balloon 3 under the driving of the outer tube 2, for example, the rotating adapter 4 can be rotated in a clockwise or counterclockwise direction around the axis of the inner tube 1, and the outer tube 2 is synchronously rotated with the rotating adapter 4, so that the deflated and shrunk balloon 3 is gradually twisted into a spiral posture. Compared with the posture of the balloon in the related art after being shrunk, the spiral posture makes the posture of the balloon after being shrunk controllable, so as to reduce the difficulty of the operation of withdrawing the balloon 3 and avoid damaging the blood vessel wall when the balloon 3 is withdrawn.

[0051] As shown in Figure 6 In the embodiment, the distal end of the inner tube 1 is provided with a tube head 11, the tube head 11 is a tapered structure, the tube head 11 has a tube opening in communication with the inner tube 1, and the distal end of the inner tube 1 and the balloon 3 foot at the distal end of the balloon 3 are connected with the proximal end of the tube head 11 to fix the distal end of the inner tube 1 and the balloon 3 and seal the distal end of the inflation cavity 31. As an alternative embodiment, the balloon 3 foot at the distal end of the balloon 3 can be connected on the outer wall of the distal end of the inner tube 1, which can also fix and seal the distal end of the balloon 3 and the inner tube 1.

[0052] As shown in Figure 6As shown in the figure, in the embodiment, the inner diameter of the outer tube 2 is larger than the outer diameter of the inner tube 1, so as to form the inflation cavity 32 between the outer tube 2 and the inner tube 1. The distal end of the outer tube 2 is connected with the balloon tube of the proximal end of the balloon 3, and the balloon tube of the proximal end of the balloon 3 has the same outer diameter and wall thickness as the outer tube 2, so as to ensure the smoothness of the inflation cavity 32.

[0053] The connection between the inner tube 1, the outer tube 2, the balloon 3 and the tube head 11 can be glue jointing or welding, which is not limited here.

[0054] As shown in the figure, Figure 4 and Figure 7 As shown in the figure, in the embodiment, the balloon dilatation catheter further comprises:

[0055] The catheter seat 5 is provided with a guide wire cavity 51 and a first mounting hole 511, the inner tube 1 passes through the first mounting hole 511 and communicates with the guide wire cavity 51, and the outer wall of the inner tube 1 is fixedly connected with the first mounting hole 511. In this way, the inner tube 1 can be fixed with the catheter seat 5, so as to facilitate the rotation of the adapter 4 to drive the outer tube 2 to rotate relative to the inner tube 1, and facilitate the insertion of the guide wire into the inner tube 1 from the guide wire cavity 51.

[0056] As shown in the figure, Figure 5 and Figure 7 As shown in the figure, in the embodiment, the rotating adapter 4 comprises:

[0057] The connecting sleeve 41 is provided with a connecting hole, and the proximal end of the connecting hole is sleeved on the distal end of the catheter seat 5.

[0058] The rotating member 42 is provided with a through hole 421, the rotating member 42 is sleeved on the outer side of the proximal end of the inner tube 1 through the through hole 421, the distal end of the rotating member 42 is fixedly connected with the proximal end of the outer tube 2, the proximal end of the rotating member 42 is rotationally arranged at the distal end of the connecting hole, and an axial limiting structure is arranged between the proximal end of the rotating member 42 and the distal end of the connecting hole, which is used for limiting the relative movement of the rotating member 42 and the connecting part in the axial direction.

[0059] The rotating member 42 can rotate relative to the inner tube 1 through the through hole 421 and drive the outer tube 2 to rotate. The connecting sleeve 41 is connected with the catheter seat 5, and the rotating member 42 can rotate relative to the connecting sleeve 41, so as to improve the stability of the rotation of the rotating member 42. The axial limiting structure can prevent the rotating member 42 from being pulled out of the connecting sleeve 41.

[0060] As shown in the figure, Figure 5As shown, in the embodiment, the connecting hole is a stepped hole, including a first inner hole 411 and a second inner hole 412, the inner diameter of the first inner hole 411 is larger than that of the second inner hole 412, the first inner hole 411 is located at the proximal end of the connecting hole and is sleeved with the distal end of the catheter seat 5, and the second inner hole 412 is located at the distal end of the connecting hole. The proximal end of the rotating piece 42 is provided with a first core 422, the through hole 421 penetrates the first core 422, the first core 422 passes through the second inner hole 412 and extends into the first inner hole 411, and the rotating piece 42 abuts against the distal end of the connecting sleeve 41. The rotating piece 42 can be a cylindrical structure, the first core 422 extends from the proximal end of the rotating piece 42 into the connecting hole, and the rotating piece 42 rotates relative to the connecting sleeve 41 through the first core 422.

[0061] The axial limiting structure includes a step surface 413 between the first inner hole 411 and the second inner hole 412, and a protrusion 4221 arranged on the outer wall of the first core 422, the protrusion 4221 abuts against the step surface 413. The cooperation of the protrusion 4221 and the step surface 413 can prevent the first core 422 from moving to the distal end relative to the connecting sleeve 41, thereby avoiding the first core 422 from being pulled out of the connecting sleeve 41.

[0062] As shown in the drawings, Figure 5 As shown, in the embodiment, the distal end of the rotating piece 42 is provided with a second core 423, the through hole 421 penetrates the second core 423, the second core 423 extends between the outer wall of the proximal end of the inner tube 1 and the inner wall of the proximal end of the outer tube 2, and the second core 423 is connected with the inner wall of the proximal end of the outer tube 2. The second core 423 can increase the connection area between the rotating piece 42 and the outer tube 2, thereby improving the stability of the connection between the rotating piece 42 and the outer tube 2.

[0063] The outer wall of the first core 422 is attached to the first inner hole 411. Such arrangement can improve the stability of the rotation of the first core 422 and the first inner hole 411.

[0064] As shown in the drawings, Figure 5As shown, in this embodiment, the catheter seat 5 includes a first inner cavity 52 disposed at the distal end of the guidewire cavity 51. The side wall of the catheter seat 5 is provided with an injection port 521 communicating with the first inner cavity 52. ​​The first mounting hole 511 is located between the first inner cavity 52 and the second inner cavity. The catheter seat 5 also includes a second mounting hole 522, which penetrates the distal end of the catheter seat 5 and the first inner cavity 52. ​​The inner tube 1 passes through the second mounting hole 522, the first inner cavity 52 and the first mounting hole 511 and communicates with the guidewire cavity 51. The second mounting hole 522 communicates with the through hole 421. The inner diameter of the second mounting hole 522 is larger than the outer diameter of the inner tube 1, and the inner diameter of the through hole 421 is larger than the outer diameter of the inner tube 1. Liquid can be injected into the inflation cavity 32 through the inflation port 521, the first inner cavity 52, the first mounting hole 511, and the through hole 421, causing the balloon 3 to inflate and expand. Alternatively, liquid can be drawn out of the inflation cavity 32 through the inflation port 521, the first inner cavity 52, the first mounting hole 511, and the through hole 421, causing the balloon 3 to depressurize and contract. This also improves the compactness of the structure.

[0065] like Figure 5 As shown, in this embodiment, a sealing ring 43 is provided between the outer wall of the first core 422 and the second inner hole 412. The sealing ring 43 can prevent liquid from leaking out from the gap between the first core 422 and the second inner hole 412.

[0066] like Figure 5 As shown, in this embodiment, the distal end of the conduit seat 5 is provided with a protrusion 53, and the first inner hole 411 is sleeved on the protrusion 53. The protrusion 53 is provided with a constriction 531 communicating with the second mounting hole 522. The outer wall of the proximal end of the first core 422 is adapted to the shape of the constriction 531. The outer wall of the proximal end of the first core 422 can fit together with the constriction 531 to seal the through hole 421 and the second mounting hole 522.

[0067] like Figure 5 As shown, in one specific embodiment of this example, the first inner hole 411 can be threadedly connected to the protrusion 53.

[0068] like Figure 1 As shown, in one embodiment of this invention, the outer wall of the balloon 3 is a smooth arc surface. This allows the balloon 3 to dilate narrowed sections of the blood vessel.

[0069] like Figure 8 As shown, in another embodiment of this invention, a plurality of scoring elements 33 are uniformly arranged circumferentially on the outer wall of the balloon 3, and the scoring elements 33 extend along the axial direction of the balloon 3. The scoring elements 33 can be used to remove lesions within blood vessels. For example, n scoring elements 33 can be arranged circumferentially on the outer wall of the balloon 3, where n is a positive integer, and the angle between two adjacent scoring elements 33 and the central axis of the balloon 3 can be... When n is 4, the angle between the two adjacent notched members 33 and the central axis of the balloon 3 is 90°.

[0070] As shown in Figure 8 , Figure 9 and Figure 10 , in the present embodiment, a plurality of notched members 33 are arranged on the outer wall of the balloon 3 in the axial direction, for example, a plurality of notched members 33 in the circumferential direction are defined as a group of notched members 33, and a plurality of groups of notched members 33 are arranged in the axial direction on the outer wall of the balloon 3. Optionally, three groups of notched members 33 are arranged on the outer wall of the balloon 3.

[0071] As shown in Figure 10 and Figure 11 , in the present embodiment, the end of the notched member 33 away from the balloon 3 is a pointed end, and the opposite sides of the notched member 33 are respectively provided with a first elastic wall 331 and a second elastic wall 332. One end of the first elastic wall 331 and the second elastic wall 332 is connected to the balloon 3, and the other end of the first elastic wall 331 and the second elastic wall 332 is slidably attached to the opposite side surfaces of the notched member 33. One end of the first elastic wall 331 and the second elastic wall 332 can support the notched member 33 to keep the notched member 33 perpendicular to the outer wall of the balloon 3.

[0072] When the balloon 3 is in an inflated state, the other end of the first elastic wall 331 and the second elastic wall 332 moves away from the pointed end, and when the balloon 3 is in a deflated state, the other end of the first elastic wall 331 and the second elastic wall 332 moves towards the pointed end. The length of the pointed end of the notched member 33 is related to the degree of inflation of the balloon 3, and as the degree of inflation of the balloon 3 increases, the length of the pointed end of the notched member 33 increases, so as to facilitate cutting of lesions in the blood vessel.

[0073] As shown in Figure 11 , in the present embodiment, the surface of the first elastic wall 331 and the side wall of the notched member 33 have a first channel 3311, and the surface of the second elastic wall 332 and the side wall of the notched member 33 have a second channel 3321. The first channel 3311 and the second channel 3321 can facilitate blood flow, avoiding obstruction of the blood flow passage after the balloon 3 is inflated.

[0074] Although embodiments of the present application have been described in conjunction with the accompanying drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A balloon dilatation catheter characterized by, The utility model relates to a kind of medical devices, including: Inner tube (1); Outer tube (2), is sleeved in the outside of the inner tube (1); Balloon (3), is sleeved in the outside of the inner tube (1) far end, the far end of the balloon (3) is connected with the far end of the inner tube (1) and seal, the proximal end of the balloon (3) is connected with the far end of the outer tube (2), the inner wall of the balloon (3) and the outer wall between the inner tube (1) have filling cavity (31), the inner wall of the outer tube (2) and the outer wall between the inner tube (1) have with the filling cavity (31) communication filling cavity (32); Rotary adapter (4), is sleeved in the outside of the inner tube (1) proximal end, the far end of the rotary adapter (4) is connected with the proximal end of the outer tube (2), the rotary adapter (4) is used to drive the outer tube (2) relative rotation of the inner tube (1), the balloon (3) is suitable for being driven relative rotation of the outer tube (2) and the inner tube (1) and forms torsional folding state.

2. The balloon dilation catheter of claim 1, wherein, Also including: Catheter seat (5) is provided with guide wire cavity (51) and first mounting hole (511), the inner tube (1) passes through the first mounting hole (511) and is communicated with the guide wire cavity (51), the outer wall of the inner tube (1) and the first mounting hole (511) fixed connection.

3. The balloon dilation catheter of claim 2, wherein, The rotary adapter (4) includes: Connecting sleeve (41) is provided with connecting hole, the proximal end of the connecting hole is sleeved in the far end of the catheter seat (5); Rotary piece (42) is provided with through hole (421), the rotary piece (42) is sleeved in the outside of the inner tube (1) proximal end by the through hole (421), the far end of the rotary piece (42) is fixedly connected with the proximal end of the outer tube (2), the proximal end of the rotary piece (42) is rotationally arranged in the far end of the connecting hole, the proximal end of the rotary piece (42) and the far end of the connecting hole are provided with axial limit structure, and the axial limit structure is used to limit the relative movement of the rotary piece (42) and connecting portion along the axial direction.

4. The balloon dilatation catheter of claim 3, wherein, The connecting hole is a stepped hole, including first inner hole (411) and second inner hole (412), the inner diameter of the first inner hole (411) is greater than the inner diameter of the second inner hole (412), the first inner hole (411) is located in the proximal end of the connecting hole and is sleeved in the far end of the catheter seat (5), the second inner hole (412) is located in the distal end of the connecting hole; The proximal end of the rotary piece (42) is provided with first core body (422), the through hole (421) penetrates the first core body (422), the first core body (422) passes through the second inner hole (412) and extends into the first inner hole (411), and the rotary piece (42) is butted against the far end of the connecting sleeve (41); The axial limit structure includes the stepped surface (413) between the first inner hole (411) and second inner hole (412), and the protrusion (4221) arranged on the outer wall of the first core body (422), and the protrusion (4221) is butted against the stepped surface (413).

5. The balloon dilation catheter of claim 4, wherein, The distal end of the rotating member (42) is provided with a second core (423), the through hole (421) penetrates the second core (423), the second core (423) extends into the space between the outer wall of the proximal end of the inner tube (1) and the inner wall of the proximal end of the outer tube (2), and the second core (423) is connected with the inner wall of the proximal end of the outer tube (2); The outer wall of the first core (422) is attached to the second inner hole (412); and / or, A sealing ring (43) is arranged between the outer wall of the first core (422) and the second inner hole (412).

6. The balloon dilation catheter of claim 5, wherein, The catheter seat (5) comprises a first inner cavity (52) arranged at the distal end of the guide wire cavity (51), the side wall of the catheter seat (5) is provided with a filling port (521) in communication with the first inner cavity (52), and the first mounting hole (511) is located between the first inner cavity (52) and the second inner cavity; the catheter seat (5) further comprises a second mounting hole (522), the second mounting hole (522) penetrates the distal end of the catheter seat (5) and the first inner cavity (52), the inner tube (1) passes through the second mounting hole (522), the first inner cavity (52) and the first mounting hole (511) and communicates with the guide wire cavity (51), the second mounting hole (522) communicates with the through hole (421), the inner diameter of the second mounting hole (522) is greater than the outer diameter of the inner tube (1), and the inner diameter of the through hole (421) is greater than the outer diameter of the inner tube (1).

7. The balloon dilatation catheter of claim 6, wherein, The distal end of the catheter seat (5) is provided with a convex part (53), the first inner hole (411) is sleeved on the convex part (53), and the convex part (53) is provided with a necked part (531) in communication with the second mounting hole (522), and the outer wall of the proximal end of the first core (422) is matched with the shape of the necked part (531).

8. The balloon dilation catheter of any of claims 1-7, wherein, The outer wall of the balloon (3) is a smooth curved surface; or a plurality of score members (33) are uniformly arranged on the outer wall of the balloon (3) in the circumferential direction, and the score members (33) extend in the axial direction of the balloon (3).

9. The balloon dilation catheter of claim 8, wherein, The end of the score member (33) away from the balloon (3) is a pointed end, first and second elastic walls (331) and (332) are respectively arranged on the opposite sides of the score member (33), one end of each of the first and second elastic walls (331) and (332) is connected to the balloon (3), and the other end of each of the first and second elastic walls (331) and (332) is slidably attached to the surface of the opposite side of the score member (33); In the inflated state of the balloon (3), the other end of each of the first and second elastic walls (331) and (332) moves away from the pointed end, and in the deflated state of the balloon (3), the other end of each of the first and second elastic walls (331) and (332) moves towards the pointed end.

10. The balloon dilatation catheter of claim 9, wherein, The surface of the first elastic wall (331) and the side wall of the score member (33) have a first channel (3311), and the surface of the second elastic wall (332) and the side wall of the score member (33) have a second channel (3321).

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