CN219126662U - Venous radio frequency ablation device - Google Patents

Abstract

The utility model discloses a venous radio frequency ablation device, which comprises: the pushing rod is a hollow pipe fitting, a threading channel is formed in the pushing rod, and two axial ends of the pushing rod are opposite far ends and near ends; the handle is fixedly connected to the proximal end of the pushing rod; the heating element is located the distal end of push rod, the heating element is the heater strip, the heater strip adopts electrically conductive memory material and spiral to coil into primary spring, primary spring has: the primary spring is spirally wound into a secondary spring as a whole in a preset state; and in a stretched state, the secondary springs are relatively straightened. The diameter of this application one-level spring under tensile state is less, can put into less blood vessel, can be in addition according to the size of the adaptive selection heating element of blood vessel's diameter, can closely laminate with the blood vessel wall after making it release, adopts lower temperature can treat varicose vein, has reduced the risk of blood vessel burn.

Description

Venous radio frequency ablation device

Technical Field

The application relates to the technical field of medical equipment, in particular to a venous radio frequency ablation device.

Background

Varicose veins are a common disease of the venous system, and the main reason is that congenital vascular wall membranes are weak or maintain the same posture for a long time, blood is accumulated in lower limbs, and the daily accumulation and the monthly accumulation destroy venous valves to generate venous pressure which is too high, so that blood vessels protrude from the skin surface.

The operation for treating varicose veins comprises the traditional saphenous vein high ligation and stripping operation, laser treatment, radio frequency ablation, microwave treatment, electrocoagulation treatment and photopheresis. These procedures have advantages and disadvantages and, in combination, are best treated with radiofrequency ablation. During radio frequency ablation treatment, a radio frequency catheter is inserted into a great saphenous vein through puncture near a knee joint, radio frequency energy is released through the catheter, and the vein is damaged by high temperature generated by heat energy to cause vascular contracture, so that the vein wall is thickened, the lumen is contracted to form fibrosis, and finally the vein wall is closed, thereby solving the problem of varicose veins.

The common products used for radio frequency ablation in the market at present are combined with a radio frequency generator through a special electrode catheter, and heat energy is generated at a heating element at the distal end of the electrode catheter, so that varicose veins are treated. However, the diameters of the electrode catheters are 6F and 7F, so that the diameter of an invasive blood vessel is large and cannot be in close contact with the wall of the blood vessel, and the electrode catheter has a high temperature, so that the problem of burning the blood vessel exists.

Disclosure of Invention

The utility model provides a venous radio frequency ablation device, which solves the problems of large diameter and vessel burning of invasive blood vessels in the prior art.

A venous radiofrequency ablation device comprising:

the pushing rod is a hollow pipe fitting, a threading channel is formed in the pushing rod, and two axial ends of the pushing rod are opposite far ends and near ends;

the handle is fixedly connected to the proximal end of the pushing rod;

the heating element is located the distal end of push rod, the heating element is the heater strip, the heater strip adopts electrically conductive memory material and spiral to coil into primary spring, primary spring has:

the primary spring is spirally wound into a secondary spring as a whole in a preset state;

and in a stretched state, the secondary springs are relatively straightened.

The following provides several alternatives, but not as additional limitations to the above-described overall scheme, and only further additions or preferences, each of which may be individually combined for the above-described overall scheme, or may be combined among multiple alternatives, without technical or logical contradictions.

Optionally, the inside of primary spring is first chamber way be fixed with the thermocouple in the first chamber way, the thermocouple is connected with first wire, this first wire is in proper order via first chamber way with in the push rod extend to the proximal end the handle.

Optionally, an axial distance of 6-20 mm is left between the distal end of the thermocouple and the distal end of the primary spring.

Optionally, the proximal end of the primary spring is inserted into and fixed to the push rod, and the heating wire is connected to a second wire, and the second wire extends proximally to the handle through the push rod.

Optionally, the proximal end of the handle further has a circuit connector, and the first wire and the second wire are connected to the circuit connector.

Optionally, at the proximal end of the primary spring, the heating wire has two straight sections, wherein one straight section is a portion of the proximal end of the primary spring that straightens, and the other straight section is a portion of the distal end of the primary spring that is folded back through the first cavity and extends out of the first cavity;

the number of the second wires is two, the two second wires are respectively welded to the corresponding straight sections, and welding spots are arranged in a staggered mode.

Optionally, a switch connected with the second wire and controlling the on-off of the second wire is installed on the handle.

Optionally, the outer surface of the heating wire is provided with an insulating layer.

Optionally, the diameter of the heating wire is 0.1-0.2 mm, and the diameter of the primary spring is 0.6-1.0 mm.

Optionally, the diameter of the secondary spring is 2-20 mm, and the length of the secondary spring is 3-20 cm.

The application has the following technical effects:

1. the diameter of the primary spring in the stretched state is smaller, and the primary spring can be placed in a catheter with smaller diameter compared with the prior art, namely, can be placed in a smaller blood vessel.

2. The diameter and the length of the secondary spring are selected multiply, and the size of the heating element can be selected according to the diameter adaptability of the blood vessel, so that the heating element can be tightly attached to the wall of the blood vessel after being released, varicose veins can be treated by adopting lower temperature, and the risk of blood vessel burn is reduced.

Drawings

Fig. 1 is a schematic structural view of a venous radiofrequency ablation device according to an embodiment of the present application;

FIG. 2 is a schematic view of the structure of the thermocouple of the present application extending into the heating element in a stretched state;

FIG. 3 is a schematic view of the heating element of FIG. 1 in a pre-molded state;

FIG. 4 is a schematic view of a structure in which a heating element is fixedly connected to a push rod;

FIG. 5 is a schematic diagram of a circuit board;

FIG. 6 is a schematic diagram of a venous RF ablation system;

fig. 7 is a schematic view of the structure of the catheter fitting with the catheter hub.

Reference numerals in the drawings are described as follows:

10. a venous radiofrequency ablation device;

100. a push rod; 110. a threading channel;

200. a handle; 210. a circuit connector; 211. a circuit board; 212. an electronic component; 220. a switch;

300. a heating wire; 310. a primary spring; 311. a first channel; 312. a thermocouple; 313. a first wire; 314. a second wire; 315. welding spots; 320. a secondary spring; 321. ball head; 330. a straight section; 331. a straight section;

400. a conduit; 401. a catheter holder; 402. a guiding part.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In this application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number, order of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

Referring to fig. 1-5, an embodiment of the present application provides a venous radiofrequency ablation device 10 including a push rod 100, a handle 200, and a heating element.

For ease of understanding, the distal and proximal ends in the following embodiments are distance relative to the operator, and reference is specifically made to X and Y in fig. 1-3, where X is the proximal end and Y is the distal end.

The push rod 100 is a hollow pipe, a threading channel 110 is arranged inside the push rod 100, two axial ends of the push rod 100 are opposite distal ends and proximal ends, and specific materials can be selected from stainless steel, nickel titanium, PEEK, PI, PA and the like. The handle 200 is used for manipulating the push rod 100 and is fixedly connected to the proximal end of the push rod 100. The heating element is located at the distal end of the push rod 100, specifically, the heating element is a heating wire 300, and the heating wire 300 is made of a conductive memory material, such as a nickel-iron alloy wire, a stainless steel wire, or a nickel-titanium alloy wire. The heating wire 300 is spirally wound as a primary spring 310.

The primary spring 310 has two opposite states, including:

as shown in fig. 3, in a pre-formed state, the primary spring 310 is spirally wound as a secondary spring 320 as a whole;

as shown in fig. 2, in the stretched state, the secondary springs 320 are relatively straightened.

The pre-shaping state can be realized by heat treatment, specifically, the primary spring 310 is wound on the secondary shaping mandrel to be closely arranged, and is put into a heat shaping furnace to be shaped for 10-20 min, the shaping temperature is 400-800 ℃, and in order to avoid the problem that the distal end part of the secondary spring 320 scratches the vessel wall when being put into the vessel after shaping is finished, the distal end of the secondary spring 320 is subjected to bulb 321 treatment, the bulb 321 treatment can be realized by adopting technology, and the UV glue solidification molding or the laser welding machine molding can be selected.

The heating element of the venous radiofrequency ablation device adopts a memory material, has two states of presetting and stretching, and is converted into the preset state from the stretching state when released in a blood vessel, so that the heating element can be tightly attached to the wall of the blood vessel.

The inside of primary spring 310 is first passageway 311, is fixed with thermocouple 312 (can directly adopt the sticky fixed) in first passageway 311, and thermocouple 312 can accurately detect heating element's temperature, makes its operator accurate control heating element's temperature range, avoids the too high burning blood vessel of temperature, the too low effect that does not reach vein wall closure. The specific material of the thermocouple 312 is not limited, and nickel-chromium, nickel-aluminum alloy wire and other materials can be used. The thermocouple 312 is connected to a first lead 313, which first lead 313 extends proximally through the first lumen 311 and the push rod 100, in turn, to the handle 200.

The first conductive wire 313 is disposed in the first cavity 311, so as to avoid interference and winding with the outside of the primary spring 310, and enable the primary spring 310 to be smoothly changed from a stretched state to a pre-molded state.

The thermocouple 312 may be fixed at any location within the first channel 311, leaving an axial spacing of 6-20 mm between the distal tip of the thermocouple 312 and the distal tip of the primary spring 310. Preferably, the axial spacing between the two is 10mm.

Alternatively, the thermocouple may have 1 or more.

The proximal end of the primary spring 310 is inserted and secured within the push rod 100, and the heater wire 300 is connected to a second wire 314, which second wire 314 extends proximally through the push rod 100 to the handle 200.

The proximal end of the primary spring 310 is specifically a proximal end in a stretched state, as shown in fig. 4, and the proximal end of the primary spring 310 in a stretched state extends into the push rod 100, where the second wire 314 and the first wire 313 are both in the threading channel 110. When the push rod 100 is fixed, the outer periphery of the primary spring 310 extending into the push rod 100 is coated with UV adhesive, and then the primary spring 310 is bonded and fixed with the inner wall of the push rod 100, so that the bonding strength of the primary spring 310 and the push rod 100 is ensured, and the length of the primary spring extending into the push rod 100 is more than 5mm.

The proximal end of the handle 200 also has a circuit connector 210 for connection to an external circuit, and the first wire 313 and the second wire 314 are connected to the circuit connector 210 in a direct or indirect connection, in this embodiment an indirect connection, and the first wire 313 and the second wire 314 are connected to the circuit connector 210 through the handle 200.

To reduce interference to the state change of the primary spring 310, at the proximal end of the primary spring 310, the heating wire 300 has two straight sections, wherein one straight section 330 straightens the proximal end of the primary spring 310, and the other straight section 331 is a portion where the distal end of the primary spring 310 is folded back through the first channel 311 and extends out of the first channel 311;

the number of the second wires 314 is two, the two wires are respectively welded to the corresponding straight sections, and the welding spots 315 are arranged in a staggered manner.

The dislocation arrangement of the two welding spots 315 can prevent the risk of short circuit caused by too close distance between the two welding spots, and further, the welded welding spots 315 can be coated with UV glue for insulation.

The handle 200 includes a driving board for driving the operation of the venous radiofrequency ablation device 10, as shown in fig. 5, the driving board includes a circuit board 211 and electronic components 212 disposed on the circuit board 211, two first wires 313 are provided, one of which is used for connecting the positive electrode, the other is used for connecting the negative electrode, two second wires 314 have no positive and negative electrode requirements, in this embodiment, two positions E-and e+ are used for connecting the second wires 314 (one of which can be selected optionally), the first wires 313 used for connecting the positive electrode are welded with the RD positions, and the first wires 313 used for connecting the negative electrode are welded with the YE.

To start and stop the heating, a switch 220 connected to the second wire 314 to control the on/off of the second wire 314 is installed on the handle 200. The heating element can be controlled to start or stop heating accordingly by operating the switch 220.

The outer surface of the heating wire 300 is provided with an insulating layer in consideration of safety. Of course, in order to enhance the insulation effect, the heating wire 300 may be sleeved into an insulation heat shrinkage tube for double insulation protection.

In this embodiment, the diameter of the heating wire 300 is 0.1 to 0.2mm, and preferably, the diameter of the heating wire 300 is 0.12mm. The diameter of the primary spring 310 is 0.6 to 1.0mm, and preferably, the diameter of the primary spring 310 is 0.7mm.

The diameter of the secondary spring 320 is 2 to 20mm, and preferably, the diameter of the secondary spring 320 is 4mm.

The length of the secondary spring 320 is 3 to 20cm, and preferably, the lengths of the secondary spring 320 are 3cm, 5cm, and 10cm.

Referring to fig. 6-7, the venous radio frequency ablation device 10 may be used in combination with a catheter 400 to form a venous radio frequency ablation system, wherein the catheter 400 has a diameter of 4F and a catheter hub 401 at one end, and the heating element is passed into the interior of the catheter 400 via the catheter hub 401 in a stretched state.

The inner diameter of the catheter hub 401 is larger than the diameter of the catheter 400, and in order to facilitate penetration of the heating element, a guide portion 402 having a gradually decreasing inner diameter is provided at one side near the catheter 400 so that the heating element can be smoothly penetrated into the catheter 400 from a larger inner diameter portion.

Specifically, the heating element in the stretched state is first inserted into the catheter 400 from the catheter holder 401, when the heating element needs to be released, the catheter 400 moves proximally relative to the heating element, at this time, the heating element is sequentially released from the distal end to the proximal end (in a preset state at this time) to be closely attached to the vessel wall, and of course, the contact area of the heating element and the vessel wall can be controlled by an operator according to actual needs, when the contact area needs to be increased, the catheter 400 moves proximally relative to the heating element, and at this time, the heating element in the catheter 400 penetrates out of the catheter 400 and is released, i.e., the contact area with the vessel wall is increased, and when the contact area needs to be reduced, the catheter 400 moves distally relative to the heating element, at this time, the heating element released in the vessel returns to the catheter 400, i.e., the contact area with the vessel wall is reduced.

The venous radio frequency ablation device and the venous radio frequency ablation system formed by the venous radio frequency ablation device have the following technical effects:

1. the catheter diameter is 4F, and the catheter is smaller than the catheter diameters of 6F and 7F in the prior art, and can be placed into smaller blood vessels.

2. The diameter and the length of the secondary spring are selected multiply, and the size of the heating element can be selected according to the diameter adaptability of the blood vessel, so that the heating element can be tightly attached to the wall of the blood vessel after being released, varicose veins can be treated by adopting lower temperature, and the risk of blood vessel burn is reduced.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. When technical features of different embodiments are embodied in the same drawing, the drawing can be regarded as a combination of the embodiments concerned also being disclosed at the same time.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application.

Claims (10)

1. A venous radio frequency ablation device, comprising:

the pushing rod is a hollow pipe fitting, a threading channel is formed in the pushing rod, and two axial ends of the pushing rod are opposite far ends and near ends;

the handle is fixedly connected to the proximal end of the pushing rod;

the heating element is located the distal end of push rod, the heating element is the heater strip, the heater strip adopts electrically conductive memory material and spiral to coil into primary spring, primary spring has:

the primary spring is spirally wound into a secondary spring as a whole in a preset state;

and in a stretched state, the secondary springs are relatively straightened.

2. The intravenous radio frequency ablation device of claim 1, wherein the primary spring is internally provided with a first channel, a thermocouple is fixed in the first channel, and the thermocouple is connected with a first wire which extends proximally to the handle sequentially through the first channel and the push rod.

3. The venous radio frequency ablation device of claim 2, wherein an axial spacing of 6-20 mm is left between the distal tip of the thermocouple and the distal tip of the primary spring.

4. The intravenous radio frequency ablation device of claim 2, wherein the proximal end of the primary spring is inserted into and secured within the push rod, and wherein the heater wire is connected to a second wire that extends proximally through the push rod to the handle.

5. The intravenous radio frequency ablation device of claim 4, wherein the proximal end of the handle further carries a circuit connector, the first and second leads each being connected to the circuit connector.

6. The intravenous radio frequency ablation device of claim 4, wherein at the proximal end of the primary spring, the heating wire has two straight sections, wherein one straight section is the proximal end of the primary spring straightened out and the other straight section is the portion of the distal end of the primary spring that is folded back through and out of the first lumen;

the number of the second wires is two, the two second wires are respectively welded to the corresponding straight sections, and welding spots are arranged in a staggered mode.

7. The intravenous radio frequency ablation device of claim 4, wherein the handle is provided with a switch connected to the second wire for controlling the on/off of the second wire.

8. The venous radio frequency ablation device of claim 1, wherein the heater wire has an outer surface with an insulating layer.

9. The venous radio frequency ablation device of claim 1, wherein the heating wire has a diameter of 0.1-0.2 mm and the primary spring has a diameter of 0.6-1.0 mm.

10. The venous radio frequency ablation device of claim 1, wherein the secondary spring has a diameter of 2-20 mm and a length of 3-20 cm.

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