Liquid circulation shock wave catheter with mechanical pressure stabilizing valve

Abstract

The utility model relates to a liquid circulation shock wave catheter with a mechanical pressure stabilizing valve, which comprises a four-way needle seat, an outer tube, a far-end thin-walled tube, a connecting plug and a shock wave emitting electrode, the four-way needle seat is provided with a wire connecting port, a liquid inlet, a waste liquid outlet and an outer tube connecting port, and two ends of the outer tube are respectively communicated with the outer tube connecting port and the far-end thin-walled tube. The shock wave emitting electrode is arranged in the far-end thin-walled tube, the connecting plug is fixed in the wire connecting port and connected with the shock wave emitting electrode through an emitting electrode wire, a liquid inlet tube is further arranged in the outer tube, one end of the liquid inlet tube extends to the end of the far-end thin-walled tube, and the other end of the liquid inlet tube extends to the liquid inlet. The outer wall of the liquid inlet pipe and the inner wall of the outer pipe form a liquid outlet cavity channel, the liquid outlet cavity channel is communicated with the waste liquid outlet, a liquid inlet of the four-way needle seat is connected with a liquid filling device, and a pressure stabilizing valve is further arranged between the liquid inlet and the liquid filling device. The device is simple in structure, convenient to operate, low in cost, high in safety and good in treatment effect.

Description

Technical Field

[0001] This utility model relates to a medical device, and more particularly to a liquid circulation shock wave duct with a mechanical pressure regulating valve. Background Technology

[0002] Shockwave catheterization is an innovative medical technology designed to treat intravascular calcification, particularly in severely calcified areas that are difficult to access with traditional methods. The core principle of this technology is to release high-energy shockwaves to break up calcified plaques within the blood vessel, reshaping the vascular pathway and thus resolving coronary artery calcification. The successful application of shockwave catheterization technology has provided new treatment options for patients with coronary artery calcification, demonstrating significant advantages, especially in treating severely calcified lesions that are difficult to manage with traditional methods.

[0003] Existing shockwave catheters on the market consist of an electrical connector, needle hub, catheter shaft, guidewire channel, liquid channel, balloon, shockwave emitting electrode, and connecting cable. The technical principle is to connect the cable plug to the shockwave generating device, use the balloon inflation device to expel the air from the catheter, and fill the balloon with a mixture of physiological saline and contrast agent (hereinafter referred to as "conductive fluid") through the liquid channel and maintain a certain pressure. The balloon is equipped with a shockwave emitting electrode. The shockwave generator delivers high voltage to the shockwave emitting electrode through the connecting cable. Under the action of the conductive fluid, a shock wave is generated, thereby achieving the purpose of fragmenting calcified lesions in blood vessels.

[0004] The existing method has only one liquid cavity, which requires the use of negative pressure to purge the air from the liquid cavity and balloon. During surgical preparation, a lot of time is spent purging the air from the liquid cavity and balloon to ensure that the electrolyte can fully fill the balloon, which increases the operation time. Moreover, it is almost impossible to completely purge the air from the cavity with this method. If a large amount of gas is present in the cavity, once the balloon ruptures, the gas will enter the blood vessels, which will pose certain risks to the operation and may even endanger life.

[0005] Shockwave emitters continuously generate bubbles and solid deposits during operation. The current approach requires doctors to aspirate negative pressure every 10 cycles to empty the gas and solid deposits from the cavity before refilling the balloon. If the balloon ruptures during operation, the gas and solid deposits generated by the shockwave generator can enter the blood vessels, posing a certain risk. Even if the balloon remains intact, the accumulation of bubbles can weaken the shockwave energy and affect the treatment effect. Utility Model Content

[0006] To address the aforementioned technical problems, the present invention aims to provide a liquid circulation shockwave conduit with a mechanical pressure regulating valve. This conduit is convenient for venting, less prone to breakage, and can provide better treatment results and lower risks.

[0007] To achieve the above-mentioned objectives, this utility model adopts the following technical solution:

[0008] A liquid circulation shock wave duct with a mechanical pressure regulating valve includes a four-way connector, an outer tube, a distal thin-walled tube, a connector, and a shock wave emitting electrode. The four-way connector has a wire connection port, a liquid inlet, a waste liquid outlet, and an outer tube connection port. One end of the outer tube is connected and sealed to the outer tube connection port, and the other end is connected and sealed to the distal thin-walled tube. The distal thin-walled tube is closed at its end. The shock wave emitting electrode is disposed inside the distal thin-walled tube. The connector is fixed in the wire connection port on the four-way connector. The connector connects to the shock wave emitting electrode. The emitting electrode is connected by an emitting electrode wire, and the emitting electrode wire and the wire connection port are sealed and fixed. The outer tube is also provided with a liquid inlet pipe. One end of the liquid inlet pipe extends to the end of the distal thin-walled tube, and the other end extends to the liquid inlet. The outer wall of the liquid inlet pipe and the inner wall of the liquid inlet are sealed together. The outer wall of the liquid inlet pipe and the inner wall of the outer tube form a liquid outlet channel, which is connected to the waste liquid outlet. The liquid inlet of the four-way needle seat is connected to a liquid filling device, and a pressure stabilizing valve is provided between the liquid inlet and the liquid filling device to keep the hydraulic pressure at the distal thin-walled tube constant.

[0009] As a preferred embodiment, the pressure regulating valve includes a valve body, spring A, spring B, and valve core; the two ends of the valve body are respectively connected to a liquid inlet and a liquid filling device, a baffle is provided in the middle of the valve body, and a through hole is provided in the middle of the baffle, the valve core is inserted in the through hole, and the two ends of the valve core are connected to the valve body through spring A and spring B respectively, so that there is a gap between the valve core and the baffle, and the through hole is in the open state.

[0010] As a preferred embodiment, the valve body is further provided with a deformation plate, and the valve core is connected to the deformation plate.

[0011] As a preferred embodiment, the movement direction of the valve core is perpendicular to the liquid flow direction generated by the liquid filling device.

[0012] As a preferred embodiment, the farthest end of the inlet pipe forms a far-end gap with the inner wall of the front end of the far-end thin-walled pipe, and the far-end gap is less than or equal to 0.5 mm.

[0013] As a preferred embodiment, the outer tube is further provided with a guide wire inner tube, one end of which protrudes from the side wall of the outer tube and the other end protrudes from the distal thin-walled tube. The outer wall of the guide wire inner tube, the outer wall of the inlet tube, and the inner wall of the outer tube form an outlet cavity, which is connected to the waste liquid outlet.

[0014] As a preferred embodiment, the outer wall of the guidewire inner tube, the outer wall of the inlet tube, and the inner wall of the distal thin-walled tube form a pressure-holding cavity, and the shock wave emitting electrode is fixed inside the pressure-holding cavity.

[0015] As a preferred embodiment, the liquid inlet pipe is sealed to the liquid inlet by adhesive A, and the emitting electrode wire is sealed and fixed to the wire connection port by adhesive B.

[0016] As a preferred embodiment, the distal thin-walled tube is made of PA12 material and has a wall thickness ≤0.05mm, while the outer tube has a wall thickness greater than that of the distal thin-walled tube.

[0017] As a preferred embodiment, the connector is connected to a shock wave generating device.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This invention also includes an inlet pipe within the outer tube. The outer wall of the inlet pipe and the inner wall of the outer tube form an outlet cavity, allowing the conductive liquid to enter the inlet pipe through the liquid inlet and reach the distal thin-walled tube where the shock wave emitting electrode is located. Under the action of the inlet pressure, the conductive liquid continuously flows from the outlet cavity to the waste liquid outlet and is finally discharged from the catheter. This structure can expel the air in the catheter during the initial filling of conductive liquid and is easy to operate. At the same time, after the shock wave is generated by the interaction of the electrodes, the waste gas and solid residue can be promptly discharged through the outlet cavity and the waste liquid outlet, improving the treatment effect. Furthermore, the pressure stabilizing valve at the liquid inlet further reduces the risk of catheter rupture. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 yes Figure 1 AA section view in the middle;

[0023] Figure 3 This is a schematic diagram of the structure of the components of this utility model, including the distal thin-walled tube, the shock wave emitting electrode, the liquid inlet tube, and the inner tube of the guide wire.

[0024] Figure 4 This is a cross-sectional structural diagram of the pressure regulating valve of this utility model (valve core open);

[0025] Figure 5 This is a cross-sectional structural diagram of the pressure regulating valve of this utility model (valve core closed).

[0026] The attached figures are labeled as follows: 1. Liquid filling device; 2. Shock wave generating device; 31. Connecting plug; 32. Emitting electrode wire; 33. Shock wave emitting electrode; 41. Valve body; 42. Spring A; 43. Spring B; 44. Valve core (44); 5. Four-way needle seat; 50. Wire connection port; 51. Liquid inlet; 52. Waste liquid outlet; 53. Fixing block A; 54. Fixing block B; 6. Liquid inlet pipe; 7. Outer pipe; 71. Liquid outlet channel; 8. Guide wire inner tube; 9. Pressure holding chamber; 10. Distal thin-walled tube; 101. Distal gap. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] like Figures 1 to 3 As shown, a liquid circulation shock wave duct with a mechanical pressure regulating valve includes a four-way needle seat 5, an outer tube 7, a distal thin-walled tube 10, a connector 31, and a shock wave emitting electrode 33. The outer tube 7 is sealed to the four-way needle seat 5 with glue, and the distal thin-walled tube 10 is welded and sealed to the outer tube. The four-way needle seat 5 is provided with a wire connection port 50, a liquid inlet 51, a waste liquid outlet 52, and an outer tube connection port. One end of the outer tube 7 is connected and sealed to the outer tube connection port, and the other end is connected and sealed to the distal thin-walled tube 10. The end of the distal thin-walled tube 10 is closed. The shock wave emitting electrode 33 is disposed inside the distal thin-walled tube 10. The connector 31 is fixed in the wire connection port 50 on the four-way needle seat 5. The connector 31 and the shock wave emitting electrode 33 are connected through an emitting electrode wire 32. The connector 31 is connected to a shock wave generating device 2. The transmitting electrode wire 32 is sealed and fixed to the wire connection port 50 by adhesive B54, so that liquid can only flow out from the waste liquid outlet and prevent liquid from entering the plug.

[0029] The distal thin-walled tube 10 is made of PA12 material with a wall thickness ≤0.05mm to achieve better shock wave transmission. The outer tube 7 has a greater wall thickness than the distal thin-walled tube 10. The outer tube uses a thicker wall to provide better support for the entire conduit and is not limited to a single material; it can be a combination of several materials.

[0030] The outer tube 7 is also equipped with a liquid inlet pipe 6. One end of the liquid inlet pipe 6 extends to the end of the distal thin-walled tube 10, and the other end extends to the liquid inlet 51. The outer wall of the liquid inlet pipe 6 is sealed to the inner wall of the liquid inlet 51 by adhesive A53, so that liquid can only flow into the distal thin-walled tube through the liquid inlet pipe. The outer wall of the liquid inlet pipe 6 and the inner wall of the outer tube 7 form a liquid outlet channel 71, which is connected to the waste liquid outlet 52. The liquid inlet 51 of the four-way needle seat 5 is connected to the liquid filling device 1, which can use a peristaltic pump to achieve liquid filling. A pressure stabilizing valve is also provided between the liquid inlet 51 and the liquid filling device 1 to keep the hydraulic pressure at the distal thin-walled tube 10 constant.

[0031] The outer tube 7 is also provided with a guide wire inner tube 8 to facilitate the passage of the guide wire. One end of the guide wire inner tube 8 passes through the side wall of the outer tube 7, and the other end passes through the distal thin-walled tube 10. The guide wire inner tube 8 and the distal thin-walled tube 10 are welded and sealed together. The outer wall of the guide wire inner tube 8, the outer wall of the liquid inlet tube 6 and the inner wall of the outer tube 7 form a liquid outlet channel 71. The liquid outlet channel 71 is connected to the waste liquid outlet 52.

[0032] The outer wall of the inner tube 8 of the guidewire, the outer wall of the inlet tube 6, and the inner wall of the distal thin-walled tube 10 form a pressure-holding cavity 9, and the shock wave emitting electrode 33 is fixed in the pressure-holding cavity 9. The farthest end of the inlet tube 6 and the inner wall of the front end of the distal thin-walled tube 10 form a distal gap 101, which is less than or equal to 0.5 mm. At the same time, the cross-sectional area of ​​the inner cavity of the inlet tube 6 is larger than the cross-sectional area of ​​the inner cavity of the outlet channel 71, so that the flow rate at the outlet is less than the flow rate at the inlet. There will be a certain amount of hydraulic pressure in the pressure-holding cavity. The conductive liquid flows through the liquid inlet into the inlet tube and then into the pressure-holding cavity. After the shock wave is generated by the interaction of the electrodes, the waste gas and solid residue flow through the outlet channel and are discharged through the waste liquid outlet.

[0033] like Figure 4 and Figure 5 As shown, the pressure regulating valve includes a valve body 41, spring A42, spring B43, and valve core 44. The two ends of the valve body 41 are respectively connected to the liquid inlet 51 and the liquid filling device 1. A baffle is provided in the middle of the valve body 41, and a through hole is provided in the middle of the baffle. The valve core 44 passes through the through hole. The two ends of the valve core 44 are connected to the valve body 41 through spring A42 and spring B43 respectively, so that there is a gap between the valve core 44 and the baffle, and the through hole is in the open state.

[0034] The valve body 41 is also equipped with a deformation plate, and the valve core 44 is connected to the deformation plate. The deformation plate can increase the contact area between the liquid and the valve core, increase the force, and improve the sensitivity of the pressure regulating valve. The movement direction of the valve core 44 is perpendicular to the liquid flow direction generated by the liquid filling device 1. This arrangement can ensure that the normal filling of the conductive liquid is not affected, and at the same time, the valve core can respond quickly and cut off the inflow of conductive liquid when the pressure is too high.

[0035] The working principle of this utility model is as follows:

[0036] The conductive liquid is drawn into the liquid filling device to purge air, and then sealed to the pressure regulating valve body. Pressure is applied to the liquid filling device to allow the conductive liquid to enter the pressure regulating valve. The valve core of the pressure regulating valve is initially in the open state under the combined force of springs A and B. The conductive liquid enters the liquid inlet of the four-way needle seat through the valve body. Due to the sealing of other paths, the conductive liquid can only flow into the inlet pipe. From the farthest end of the inlet pipe, it flows into the pressure holding chamber through the far end gap 101, and then enters the outlet chamber and flows out through the waste liquid outlet. At this time, under the action of pressure, the liquid can discharge all the gas in the chamber through the waste liquid outlet, so that the chamber is completely filled with conductive liquid.

[0037] By designing the inlet pipe 6 to have a larger cross-sectional area than the outlet pipe 71, and when the outlet flow rate is less than the inlet flow rate, a certain amount of hydraulic pressure will exist in the pressure holding chamber. At this time, if the filling pressure of the liquid filling device is increased, the pressure in the liquid circuit of the shock wave guide will continue to rise, and the hydraulic pressure will also push the valve core of the pressure stabilizing valve to rise. When the pressure value designed for the pressure stabilizing valve is reached, the liquid pressure will just push the valve core to close. If the filling device pressure is increased further, the hydraulic pressure in the inlet pipe will no longer increase, thus maintaining the set hydraulic pressure in the pressure holding chamber. As the liquid continuously flows out from the waste liquid outlet of the four-way needle seat, the pressure of the pressure stabilizing valve will continuously decrease after the valve core closes and the liquid flows out. At this time, spring A pushes the valve core to move downward. At this time, as long as the hydraulic pressure in the liquid filling device is always greater than the hydraulic pressure in the shock wave guide, the liquid will refill the pressure holding chamber after the valve opens to reach the set pressure. This process is repeated to maintain a constant hydraulic pressure in the pressure holding chamber during the continuous flow of liquid. Once the required hydraulic pressure is reached, the connector plug is used to connect to the shock wave generator. Energy is transmitted to the shock wave emitting electrode through the emitting electrode wire, generating a shock wave under the condition that the conductive liquid serves as the medium.

[0038] In summary, the structure of this invention allows the operator to easily vent gas from the cavity before surgery, preventing gas from entering the blood vessels due to misoperation or product-related risks. Furthermore, during surgery, this invention can expel gas and solid deposits generated by the shock wave from the catheter in real time, providing better treatment results and lower risks. Compared with existing technologies, this patented solution saves surgical time and reduces surgical risks.

[0039] This invention has a simple structure, is easy to operate without a particularly complex operating system, and uses mechanical stabilization without electronic sensors, resulting in lower cost, simple design, and ease of implementation. In this invention, gas is vented by filling with liquid rather than by drawing negative pressure, making it more reliable.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A liquid circulating shock wave guide tube with mechanical pressure stabilizing valve, comprising a four-way needle seat (5), an outer tube (7), a distal thin-walled tube (10), a connecting plug (31) and a shock wave emitting electrode (33), the four-way needle seat (5) is provided with a wire connection port (50), a liquid inlet (51), a waste liquid outlet (52) and an outer tube connection port, one end of the outer tube (7) is in communication and sealing connection with the outer tube connection port, the other end is in communication and sealing connection with the distal thin-walled tube (10), the end of the distal thin-walled tube (10) is closed, the shock wave emitting electrode (33) is arranged in the distal thin-walled tube (10), the connecting plug (31) is fixed in the wire connection port (50) on the four-way needle seat (5), the connecting plug (31) is connected with the shock wave emitting electrode (33) through an emitting electrode wire (32), and the emitting electrode wire (32) is sealingly fixed with the wire connection port (50), characterized in that: The outer tube (7) is also provided with a liquid inlet pipe (6), one end of the liquid inlet pipe (6) extends to the end of the distal thin-walled pipe (10), the other end extends to the liquid inlet (51), and the outer wall of the liquid inlet pipe (6) is sealingly connected with the inner wall of the liquid inlet (51); the outer wall of the liquid inlet pipe (6) and the inner wall of the outer tube (7) form a liquid outlet channel (71), the liquid outlet channel (71) is communicated with the waste liquid outlet (52), the liquid inlet (51) of the four-way needle seat (5) is connected with the liquid filling device (1), and a pressure stabilizing valve is further arranged between the liquid inlet (51) and the liquid filling device (1) to make the liquid pressure at the distal thin-walled pipe (10) constant.

2. A liquid circulating shock waveguide with a mechanical pressure stabilizing valve according to claim 1, characterized in that, The pressure stabilizing valve comprises a valve body (41), a spring A (42), a spring B (43) and a valve core (44); the two ends of the valve body (41) are communicated with the liquid inlet (51) and the liquid filling device (1) respectively, the middle part of the valve body (41) is provided with a baffle, and the middle part of the baffle is provided with a through hole, the valve core (44) is arranged in the through hole, the two ends of the valve core (44) are connected with the valve body (41) through the spring A (42) and the spring B (43) respectively, and a gap is left between the valve core (44) and the baffle, and the through hole is in an open state.

3. A liquid circulating shock waveguide with a mechanical pressure stabilizing valve according to claim 2, characterized in that, The valve body (41) is further provided with a deformation sheet, and the valve core (44) is connected with the deformation sheet.

4. A liquid circulating shock waveguide with a mechanical pressure stabilizing valve according to claim 2, characterized in that, The movement direction of the valve core (44) is perpendicular to the liquid flow direction generated by the liquid filling device (1).

5. A liquid circulating shock waveguide with a mechanical pressure stabilizing valve according to claim 1, characterized in that, The most distal end of the liquid inlet pipe (6) and the inner wall of the front end of the distal thin-walled pipe (10) form a distal end gap (101), and the distal end gap (101) is less than or equal to 0.5mm.

6. A liquid circulating shock waveguide with a mechanical pressure stabilizing valve according to claim 1, characterized in that, The outer tube (7) is also provided with a guide wire inner tube (8), one end of the guide wire inner tube (8) penetrates out of the side wall of the outer tube (7), the other end penetrates out of the distal thin-walled pipe (10), the outer wall of the guide wire inner tube (8), the outer wall of the liquid inlet pipe (6) and the inner wall of the outer tube (7) form a liquid outlet channel (71), and the liquid outlet channel (71) is communicated with the waste liquid outlet (52).

7. A liquid circulating shock waveguide with a mechanical pressure stabilizing valve according to claim 6, characterized in that, The outer wall of the guide wire inner tube (8), the outer wall of the liquid inlet pipe (6) and the inner wall of the distal thin-walled pipe (10) form a pressure maintaining cavity (9), and the shock wave emitting electrode (33) is fixed in the pressure maintaining cavity (9).

8. A liquid circulating shock waveguide with a mechanical pressure stabilizing valve according to claim 1, characterized in that, The liquid inlet pipe (6) is sealingly connected with the liquid inlet (51) through glue A (53), and the emitting electrode lead wire (32) is sealingly fixed with the lead wire connecting port (50) through glue B (54).

9. A liquid circulating shock waveguide with a mechanical pressure stabilizing valve according to claim 1, characterized in that, The distal thin-walled pipe (10) is made of PA12 material, and the wall thickness is less than or equal to 0.05mm, and the wall thickness of the outer tube (7) is greater than that of the distal thin-walled pipe (10).

10. A liquid circulating shock waveguide with a mechanical pressure stabilizing valve according to claim 1, characterized in that, The connecting plug (31) is connected with the shock wave generating device (2).

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