CN115137446A

CN115137446A - Medical catheter

Info

Publication number: CN115137446A
Application number: CN202210771624.8A
Authority: CN
Inventors: 闫永岗; 李立夫
Original assignee: Shanghai Jiamuyao Medical Technology Co ltd
Current assignee: Shanghai Jiamuyao Medical Technology Co ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-10-04

Abstract

The present invention provides a medical catheter comprising: a balloon catheter assembly and a shock wave generating device; the sacculus catheter component comprises a catheter body and a sacculus arranged on the catheter body, wherein the catheter body is provided with a liquid through cavity extending along the axial direction of the catheter body, and the inner cavity of the sacculus is communicated with the liquid through cavity; the shock wave generating device comprises a shock wave generating element and a circuit control unit, wherein the shock wave generating element is electrically connected with an external high-voltage generator through the circuit control unit; the shock wave generating element is arranged in the saccule, the circuit control unit is arranged at the near end of the catheter body, and the circuit control unit generates deformation based on the change of pressure applied to the shock wave generating element by liquid in the liquid through cavity and is switched between a conduction state and a disconnection state according to the deformation. When the saccule leaks or breaks to cause pressure drop, the circuit control unit is disconnected, so that the shock wave generating element can be prevented from continuously releasing high-voltage pulse to hurt a human body.

Description

Medical catheter

Technical Field

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

Background

Vascular calcification is a disease of stenosis and sclerosis of blood vessels caused by the accumulation of plaque in the blood vessels of the human body, the so-called plaque consisting of fibrous tissue, fat and calcium. The accumulated calcified plaque prevents the normal flow of blood, resulting in insufficient supply of oxygen and nutrients to the body,

arteriosclerosis of lower limbs caused by peripheral blood vessels, coolness, numbness and intermittent claudication of the lower limbs caused by slight occurrence, and pulsation of lower limb arteries, especially dorsum arteries, caused by serious occurrence, even amputation treatment is required. Vascular calcification occurs in coronary arteries and is clinically manifested as atherosclerotic heart disease, myocardial ischemia, angina pectoris, and myocardial infarction.

In recent years, the treatment of calcified vascular diseases mainly includes high-pressure balloons, chocolate balloons, cutting balloons, spinous process balloons, nicking balloons and rotary cutting/rotational grinding of plaques, but these instruments have limitations, high complications, can only treat superficial calcification and are ineffective for severe calcification, eccentric calcification and the like.

Based on the above, a new technology, that is, an extracorporeal lithotripsy is introduced to the field of vascular intervention, a catheter with a balloon at the far end is inserted into a blood vessel, the balloon expands and adheres to the wall at a calcified lesion, at the moment, an electrode in the balloon generates a hydroelectric wave source under the communication of a high-voltage generator, the wave source releases high-voltage pulses after being excited, and shock waves are generated due to a cavitation effect. The shock wave propagates through the liquid medium and strikes and fractures the calcified area in the blood vessel through the balloon wall to crush the calcified substance, restore the elasticity of the blood vessel, remodel the diseased blood vessel, and simultaneously avoid the damage to the inner wall/intima of the blood vessel.

The shock wave technology is applied by both American shock wave medical companies and domestic medical enterprises to provide various technical schemes for treating calcified lesions. However, in the operation process of treating calcification diseases by using the shock wave technology in the prior art, if the saccule or the catheter leaks or breaks, the saccule or the catheter cannot be distinguished or the treatment is interrupted, and the pulse is continuously released at the moment, so that the human body can be fatally injured.

Disclosure of Invention

The invention aims to provide a medical catheter, which solves the problem that when a balloon or a catheter leaks or breaks, the balloon or the catheter cannot be judged or treatment is interrupted.

In order to solve the above technical problems, the present invention provides a medical catheter comprising: a medical catheter, comprising: a balloon catheter assembly and a shock wave generating device;

the balloon catheter assembly comprises a catheter body and a balloon arranged on the catheter body, the catheter body is provided with a liquid through cavity extending along the axial direction of the catheter body, and the inner cavity of the balloon is communicated with the liquid through cavity;

the shock wave generating device comprises a shock wave generating element and a circuit control unit, wherein the shock wave generating element is electrically connected with an external high-voltage generator through the circuit control unit; the shock wave generating element is arranged in the saccule, the circuit control unit is arranged at the near end of the catheter body, and the circuit control unit generates deformation based on the change of pressure applied to the shock wave generating element by liquid in the liquid through cavity and is switched between a conduction state and a disconnection state according to the deformation.

Optionally, in the medical catheter, the circuit control unit includes a pressure sensing element, a first conductive element and a second conductive element, the pressure sensing element covers a proximal end surface of the catheter body, bends with the application of pressure to the catheter body by the liquid in the liquid passing cavity, and drives the first conductive element to move to be connected with the second conductive element, so that the circuit control unit is in a conducting state.

Optionally, in the medical catheter, the first conductive element includes a metal needle, the second conductive element includes a metal needle seat, and the pressure sensing element bends to drive the metal needle to move to and insert into the metal needle seat, so that the circuit control unit is in a conducting state.

Optionally, in the medical catheter, the pressure sensing element includes a sealing element and a spring piece that cover each other and have separable peripheral regions, the first conductive element is disposed on the spring piece, the sealing element seals the proximal end of the catheter body, and an elastic force of the sealing element is greater than an elastic force of the spring piece.

Optionally, in the medical catheter, the circuit control unit further includes a fixing member and a pressure spring, the fixing member is fixed to the proximal end of the catheter body, two ends of the pressure spring are connected to the elastic sheet and the fixing member, respectively, and the second conductive element is disposed on the fixing member and opposite to the first conductive element.

Optionally, in the medical catheter, when the pressure applied to the pressure sensing element by the liquid in the liquid passage chamber reaches a set pressure, the pressure spring reaches a target compression amount, and the first conductive element and the second conductive element are in contact with each other.

Optionally, in the medical catheter, the pressure sensing element includes a spring plate, and the spring plate covers the proximal end of the catheter body;

the circuit control unit also comprises a fixing piece and an elastic tubular structure, the fixing piece is kept relatively fixed with the near end of the catheter body, and the elastic sheet and the fixing piece respectively seal two ends of the elastic tubular structure;

the first conductive element and the second conductive element are oppositely arranged in the inner cavity of the elastic tubular structure, wherein the first conductive element is arranged on the elastic sheet, and the second conductive element is arranged on the fixing piece.

Optionally, in the medical catheter, when the pressure applied to the pressure sensing element by the liquid in the liquid passage cavity reaches a set pressure, the elastic tubular structure reaches a target compression amount, and the first conductive element is in contact with the second conductive element; and/or the presence of a gas in the gas,

the circuit control unit further comprises a pressure spring, two ends of the pressure spring are respectively connected with the elastic sheet and the fixing piece, when the pressure exerted on the pressure sensing element by the liquid in the liquid through cavity reaches a set pressure, the pressure spring reaches a target compression amount, and the first conductive element is in contact with the second conductive element.

Optionally, in the medical catheter, the medical catheter further includes a first mounting seat, the first mounting seat is connected to the proximal end of the catheter body in a sealing manner, a sealed chamber is formed inside the first mounting seat, and the circuit control unit is disposed in the sealed chamber.

Optionally, in the medical catheter, the medical catheter further comprises a second mounting seat for fixing the first mounting seat to the distal end portion of the catheter body; the second mounting seat is arranged around the circumference of the catheter body, a branch is arranged on the side wall of the mounting seat, and the branch is used for introducing liquid into the liquid passing cavity.

Optionally, in the medical catheter, the branches are inclined towards the proximal end of the catheter body.

Optionally, in the medical catheter, the medical catheter further includes a pressure sensor, and the pressure sensor is disposed in the balloon and is configured to sense a pressure change in the balloon.

In summary, the present invention provides a medical catheter, comprising: a balloon catheter assembly and a shock wave generating device; the balloon catheter assembly comprises a catheter body and a balloon arranged on the catheter body, the catheter body is provided with a liquid through cavity extending along the axial direction of the catheter body, and the inner cavity of the balloon is communicated with the liquid through cavity; the shock wave generating device comprises a shock wave generating element and a circuit control unit, wherein the shock wave generating element is electrically connected with an external high-voltage generator through the circuit control unit; the shock wave generating element is arranged in the saccule, the circuit control unit is arranged at the near end of the catheter body, and the circuit control unit generates deformation based on the change of pressure applied to the shock wave generating element by liquid in the liquid through cavity and is switched between a conduction state and a disconnection state according to the deformation. According to the medical catheter provided by the invention, the circuit control unit is switched on or off according to the pressure change applied to the catheter body by liquid in the catheter body, when the saccule is leaked or broken to cause pressure drop, the circuit control unit is switched off, and the shock wave generating element is stopped to release high-voltage pulse, so that the injury to a human body can be avoided.

Drawings

FIG. 1 is a schematic structural view of a medical catheter provided in accordance with an embodiment of the present invention;

FIG. 2 is a schematic structural view of a proximal portion of a medical catheter provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a circuit control unit according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a circuit control unit according to a second embodiment of the present invention;

wherein the reference numerals are as follows:

1-balloon, 2-pressure sensor, 3-shock wave generating element, 4-developing ring, 5-inner tube, 6-outer tube, 71-first wire, 72-second wire; 8-a second connecting seat, 81-a branch, 9-a circuit control unit, 10-a first connecting seat, 11-an external high voltage generator;

91-spring plate, 92-fixing piece, 93-pressure spring, 94-sealing piece, 95-first conductive element and 96-second conductive element; 97-elastic tubular structure; (ii) a

941 peripheral area, 942 middle area.

Detailed Description

To make the objects, advantages and features of the present invention more apparent, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently. It should be further understood that the terms "first," "second," "third," and the like in the description are used for distinguishing between various components, elements, steps, and the like, and are not intended to imply a logical or sequential relationship between various components, elements, steps, or the like, unless otherwise indicated or indicated.

[ EXAMPLES ] A method for producing a semiconductor device

Embodiments of the present invention provide a medical catheter, comprising: a balloon catheter assembly and a shock wave generating device.

Referring to fig. 1 in combination with fig. 2, the balloon catheter assembly includes a catheter body and a balloon 1 disposed on the catheter body, the catheter body has a liquid through cavity 5 extending axially along the catheter body, and an inner cavity of the balloon 1 is communicated with the liquid through cavity 5;

the shock wave generating device comprises a shock wave generating element 3 and a circuit control unit 9, wherein the shock wave generating element 3 is electrically connected with an external high-voltage generator 11 through the circuit control unit 9; the shock wave generating element 3 is arranged in the sacculus 1, the circuit control unit 9 is arranged at the near end of the catheter body, and the circuit control unit 9 generates deformation based on the change of pressure applied to the liquid in the liquid through cavity 5 and switches between a conduction state and a disconnection state according to the deformation.

According to the medical catheter provided by the embodiment of the invention, the circuit control unit 9 is switched on or off according to the pressure change applied to the catheter body by liquid in the catheter body, when the pressure suddenly drops due to the leakage or rupture of the balloon 1, the circuit control unit 9 is switched off, and the shock wave generating element 3 stops releasing high-voltage pulse, so that the injury to a human body can be avoided.

Referring to fig. 3, the circuit control unit 9 includes a pressure sensing element, a first conductive element 95 and a second conductive element 96, the pressure sensing element covers a proximal end surface of the catheter body and bends when the liquid in the liquid passing cavity 5 applies pressure thereto, the first conductive element 95 is disposed on the pressure sensing element, and the first conductive element 95 is driven to contact with the second conductive element 96 when the pressure sensing element bends, so that the circuit control unit 9 is in a conductive state.

According to the medical catheter provided by the embodiment of the invention, when filling liquid is introduced from the liquid passage cavity 5 to fill the whole balloon 1, so that the balloon 1 is expanded and the filling liquid is continuously introduced, the liquid in the liquid passage cavity 5 applies pressure to the pressure sensing element, so that the pressure sensing element is bent towards the direction far away from the catheter body, the first conductive element 95 arranged on the pressure sensing element moves towards the direction far away from the catheter body, when the first conductive element 95 is in contact with the second conductive element 96, the whole circuit is conducted, high-voltage discharge of the external high-voltage generator 11 is transmitted to the shock wave element through the circuit, so that the shock wave element discharges shock waves and transmits the shock waves to the balloon 1, and the balloon 1 impacts an area of a focus, so as to achieve the purpose of treatment. If in the treatment process, the sacculus 1 leaks or breaks, at the moment, the liquid passing cavity 5 suddenly drops the pressure applied by the pressure sensing element, the bending degree of the pressure sensing element is gradually reduced, the first conductive element 95 and the second conductive element 96 are not contacted any more, the whole circuit is disconnected, and the external high-voltage generator 11 stops discharging electricity to the shock wave generating element 3, so that the injury to a human body can be avoided.

With reference to fig. 1, in this embodiment, the catheter body may include an inner tube 5 and an outer tube 6, the inner tube 5 is sleeved with the outer tube 6, a gap between the outer tube 6 and the outer tube 6 forms the fluid passage cavity 5, the proximal end and the distal end of the balloon 1 are both fixed to the outer tube 6, and the inner tube 5 penetrates through the balloon 1. The lumen of the inner tube 5 may be used for the passage of a guide wire, through which the medical catheter is guided to the focal zone before operation and then to start operation.

The medical catheter can further comprise a developing ring 4, the developing ring 4 is sleeved on the inner tube 5 and located in the balloon 1, the number of the developing ring 4 can be two, one is close to the near end of the balloon 1, and the other is close to the far end of the balloon 1 and used for displaying the arrangement of the balloon 1, so that the balloon 1 can reach a focus area under the guidance of a guide wire, but the application is not limited to this.

In addition, in this embodiment, the liquid introduced from the liquid passage cavity 5 to fill the balloon 1 may be saline, contrast agent or a mixed solution of the saline and the contrast agent, for example, the ratio of the saline to the contrast agent is 1:1, which can develop the expansion (profile) of the balloon 1 while serving as a shock wave transmission medium.

In order to make the balloon 1 fully expand before the pressure sensing element starts to bend, the elastic force of the balloon 1 should be larger than that of the pressure sensing element, and since the balloon 1 is generally made of TPU (thermoplastic polyurethane elastomer rubber) or other materials, the rigidity strength of the pressure sensing element should be larger than that of TPU, for example, the pressure sensing element can be made of PET (polyethylene terephthalate), but the present application is not limited thereto, and other materials having hardness larger than that of the balloon 1 and having self-recovery curvature are all within the selectable range of the present application.

Optionally, the first conductive element 95 includes a metal needle, the second conductive element 96 includes a metal needle seat, and when the pressure sensing element bends to drive the metal needle to move until the metal needle seat is inserted, the circuit control unit 9 is in a conducting state. In other embodiments, the first conductive element 95 and the second conductive element 96 may also adopt other elements that can be conducted in a contact conduction manner, and details are not repeated herein. In addition, in addition to the aforementioned, the first conductive element 95 is moved to be conducted with the second conductive element 96, and the first conductive element 95 may be driven to rotate when the pressure sensing element is bent, so as to be conducted with the second conductive element 96.

In this embodiment, referring to fig. 3, the pressure sensing element includes a sealing member 94 and a resilient piece 91 that cover each other and have a separable peripheral region 941, the first conductive element 95 is disposed on the resilient piece 91, the resilient force of the sealing member 94 is greater than the resilient force of the resilient piece 91, for example, the sealing member 94 may be made of TPU, and the resilient piece 91 may be made of PET. The sealing member 94 and the peripheral region 941 of the elastic sheet 91 are separated from each other, the middle region 942 can be relatively fixed or can be separated from each other, and as the liquid in the liquid passing cavity 5 is gradually added, the sealing member 94 is pressed to bend so as to press the elastic sheet 91 and also synchronously bend, so that the first conductive element 95 moves away from the catheter body. Utilize elasticity great the sealing member 94 is right the near end of pipe body seals, and peripheral region 941 with shell fragment 91 is not fixed mutually, makes the marginal area of sealing member 94 difficult with break away from between the pipe body, thereby has the sealed effect of preferred, the liquid that leads to in the sap cavity 5 can not certainly the near end of pipe body flows out, influences lead to the liquid pressure size in the sap cavity 5, and then influences switching on of whole circuit.

Further, in this embodiment, the circuit control unit 9 may further include a fixing element 92 and a pressure spring 93, two ends of the pressure spring 93 are respectively connected to the elastic sheet 91 and the fixing element, and the second conductive element 96 is disposed on the fixing element 92 and opposite to the first conductive element 95. The fixing member 92 is fixed relative to the proximal end of the catheter body, when the elastic sheet 91 is bent, the pressure spring 93 is pressed, the first conductive element 95 is gradually close to the second conductive element 96, and when the bending degree of the elastic sheet 91 is gradually reduced, the pressure spring 93 rebounds, so that the first conductive element 95 is separated from the second conductive element 96, and the whole circuit is broken. Because the pressure spring 93 has certain rigidity, after the first conductive element 95 and the second conductive element 96 are connected through the pressure spring 93, when the bending degree of the elastic sheet 91 is gradually reduced, the first conductive element 95 and the second conductive element 96 can be rapidly separated under the resilience of the pressure spring 93, so that the injury to a human body can be avoided within the first time.

Preferably, the pressure spring 93 is a spring with a predetermined compression amount, and when the pressure of the fluid cavity 5 reaches a predetermined pressure (for example, 3atm or more) and acts on the front elastic sheet 91 during the operation, the spring can be compressed to reach the target compression amount, so as to connect the circuit. If the amount of the liquid to be supplied can be controlled according to the relationship between the target compression amount of the pressure spring and the set pressure, insufficient filling or excessive filling is avoided.

Preferably, referring to fig. 2 in particular, the medical catheter further includes a first mounting seat 10, the first mounting seat 10 is connected to the distal end of the catheter body in a sealing manner, a closed chamber is formed inside the first mounting seat 10, and the circuit control unit 9 is disposed in the inner cavity of the first mounting seat 10. The closed chamber can further prevent the liquid from flowing out too much from the near end and being incapable of reaching the set pressure, and the conduction of the whole circuit is influenced.

The fixing member 92 may be a part of an inner wall of the first mounting seat 10, or the fixing member 92 is fixed to the inner wall of the first mounting seat 10.

The medical catheter may further include a second mounting seat 8, the second mounting seat 8 is used for fixing the first mounting seat 10 to the distal end portion of the catheter body, and the first mounting seat 10 and the second mounting seat 8 are detachably connected, so that the second mounting seat 8 can be detached to facilitate viewing of the condition of the circuit control unit 9 in the second mounting seat 8 when necessary. The first mounting seat 10 and the second mounting seat 8 may be detachably connected by means of a threaded connection or a scarf joint, but the application is not limited thereto.

Second mount pad 8 winds the circumference setting of pipe body, promptly, second mount pad 8 have the internal diameter with the straight type mouth of the external diameter assorted of pipe body, second mount pad 8 still is equipped with branch 81 in the lateral wall, branch 81 is used for external filling equipment, with to let in liquid in the logical liquid chamber 5. Preferably, the branch 81 is inclined towards the proximal end of the catheter body, so that the liquid, after entering the lumen 5, first flows towards the balloon 1, and then continues to fill the proximal end of the catheter body after the balloon 1 has been expanded, so as to apply pressure to the pressure-sensitive element.

In addition, preferably, the medical catheter further comprises a pressure sensor 2, and the pressure sensor 2 is arranged in the balloon 1 and used for sensing pressure change in the balloon 1. During the use of the medical catheter, although the pressure applied to the pressure sensing element by the introduced liquid reaches the set pressure, the pulse is not released all the time, and the monitoring result of the pressure sensor 2 can be combined to judge whether the balloon 1 leaks or the circuit is failed. If the monitoring result of the pressure sensor 2 shows that the pressure is normal, the circuit can be judged to be in fault, and if the monitoring result of the pressure sensor 2 shows that the pressure is abnormal, the balloon 1 can be judged to be leaked.

In the above description, although the circuit relationship between the shock wave generating element 3 and the external high voltage generator 11 is not described in detail, it should be understood that the entire circuit may be constructed using wires, and specifically, a first wire 71 and a second wire 72 may be included, both ends of the first wire 71 are connected to the shock wave generating element 3 and the first conductive element 95, respectively, both ends of the second wire 72 are connected to the second conductive element 96 and the external high voltage generator 11, respectively, and when the first conductive element 95 and the second conductive element 96 are in contact, the entire circuit is conducted.

The number of the pressure sensing elements may be multiple, multiple pressure sensing elements may be connected to the first conductive element 95 in a series or parallel manner, the circuit control unit 9 may also include multiple sets of the first conductive element 95 and the second conductive element 96, each set of the first conductive element 95 and the second conductive element 96 is correspondingly disposed, and when the number of the pressure sensing elements is multiple, the pressure sensing elements may be connected to one of the first conductive elements 95 in a series or parallel manner in a combined manner to form multiple pulse release circuits, so as to meet the requirement for high pulse energy.

The number of the pressure springs 93 may also be multiple, when the number of the pressure springs 93 is only one, preferably, the pressure springs 93 are disposed at the center line position of the pressure sensing element, and when the number of the pressure springs 93 is two, the two pressure springs 93 are symmetrically distributed on both sides of the center line of the pressure sensing element. When the number of the pressure springs 93 is one, two sets of the first conductive elements 95 and the second conductive elements 96 may be disposed, and the two sets of the first conductive elements 95 and the second conductive elements 96 are symmetrically distributed on two sides of the pressure springs 93, and when the number of the pressure springs 93 is two, one set of the first conductive elements 95 and the second conductive elements 96 may be disposed between the two pressure springs 93, which is not limited in the present application.

In this embodiment, optionally, the fixing member 92 and the pressure sensing element (including the sealing member 94 and the elastic sheet 91) may both be made of insulating materials, and the first conducting wire and the second conducting wire are directly connected to the first conducting element 95 and the second conducting element 96 respectively; alternatively, the sealing member 94 is made of an insulating material, but the fixing member 92 and the elastic piece 91 are made of a conductive material, the first conductive wire is connected to the first conductive element 95 through the elastic piece 91, and the second conductive element 96 is connected to the second conductive element 96 through the fixing member 92. When the latter is adopted, other components in contact with the fixing member 92 and the elastic piece 91 are made of insulating materials, so as to avoid interference on a circuit.

[ EXAMPLE II ]

This embodiment is similar to the embodiment, and only the differences will be described below.

Different from the first embodiment, in the present embodiment, the pressure sensing element only includes the elastic sheet 91, and the elastic sheet 91 covers the proximal end of the catheter body. In addition, the circuit control unit 9 further includes an elastic tubular structure 97, the elastic sheet 91 and the fixing member 92 respectively seal two ends of the elastic tubular structure 97, and the first conductive element 95 and the second conductive element 96 are oppositely disposed in an inner cavity of the elastic tubular structure 97.

That is, in this embodiment, the inner cavity of the elastic tubular structure 97 is a closed chamber, and even if a gap is formed between the elastic piece 91 and the catheter body due to bending, liquid does not enter the elastic tubular structure 97, and thus a circuit is not damaged.

In this embodiment, the elastic sheet 91 is directly contacted with the liquid, so that an insulating material should be used to avoid affecting the circuit.

In addition, in this embodiment, when the pressure applied to the pressure sensing element by the liquid in the liquid passing cavity 5 reaches the set pressure, the elastic tubular structure 97 reaches the target compression amount, and the first conductive element 95 is in contact with the second conductive element 96; and/or the circuit control unit further comprises a pressure spring 93, two ends of the pressure spring 93 are respectively connected with the elastic sheet 91 and the fixing member 92, when the pressure applied to the pressure sensing element by the liquid in the liquid passing cavity 5 reaches a set pressure, the pressure spring 93 reaches a target compression amount, and the first conductive element 95 is in contact with the second conductive element 96.

It should be noted that, in this specification, each embodiment is described in a progressive manner, and the emphasis of each embodiment is to be described different from that of other embodiments, and the same and similar parts in each embodiment may be referred to each other, and in addition, different parts in each embodiment may also be used in combination with each other, which is not limited by the present invention.

It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. It will be apparent to those skilled in the art that many changes and modifications can be made, or equivalents employed, to the presently disclosed embodiments without departing from the intended scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical solution of the present invention, unless the content of the technical solution of the present invention is departed from.

Claims

1. A medical catheter, comprising: a balloon catheter assembly and a shock wave generating device;

2. The medical catheter of claim 1, wherein the circuit control unit comprises a pressure sensing element, a first conductive element and a second conductive element, wherein the pressure sensing element covers the proximal end face of the catheter body, bends when the fluid in the fluid cavity applies pressure to the pressure sensing element, and drives the first conductive element to move to be connected with the second conductive element, so that the circuit control unit is in a conducting state.

3. The medical catheter of claim 2, wherein said first conductive element comprises a metal needle and said second conductive element comprises a metal needle hub, and said pressure responsive element bends to drive said metal needle to move into and insert into said metal needle hub, said circuit control unit being in a conductive state.

4. The medical catheter of claim 2, wherein the pressure sensing element comprises a sealing element and a spring piece which are mutually covered and have separable peripheral areas, the first conductive element is arranged on the spring piece, the sealing element seals the proximal end of the catheter body, and the elastic force of the sealing element is greater than that of the spring piece.

5. The medical catheter according to claim 4, wherein the circuit control unit further comprises a fixing member and a pressure spring, the fixing member is kept fixed relative to the proximal end of the catheter body, two ends of the pressure spring are respectively connected with the spring plate and the fixing member, and the second conductive element is arranged on the fixing member and is arranged opposite to the first conductive element.

6. The medical catheter of claim 5, wherein the pressure spring reaches a target amount of compression when the pressure exerted by the fluid in the lumen on the pressure sensing element reaches a set pressure, the first conductive element and the second conductive element contacting each other.

7. The medical catheter of claim 2, wherein the pressure sensing element comprises a spring covering the proximal end of the catheter body;

8. The medical catheter of claim 7, wherein the resilient tubular structure reaches a target amount of compression when the pressure exerted by the fluid in the lumen on the pressure sensing element reaches a set pressure, the first conductive element and the second conductive element contacting; and/or the presence of a gas in the atmosphere,

9. The medical catheter as claimed in any one of claims 1 to 8, further comprising a first mounting seat, wherein the first mounting seat is hermetically connected to the proximal end of the catheter body, a sealed chamber is formed inside the first mounting seat, and the circuit control unit is disposed inside the sealed chamber.

10. The medical catheter of claim 9, further comprising a second mount for securing the first mount to the distal end of the catheter body; the second mounting seat is arranged around the circumference of the catheter body, a branch is arranged on the side wall of the mounting seat, and the branch is used for introducing liquid into the liquid passing cavity.

11. The medical catheter of claim 10, wherein the branches are angled toward the proximal end of the catheter body.

12. The medical catheter of claim 1, further comprising a pressure sensor disposed within the balloon for sensing pressure changes within the balloon.