CN111227929A

Movatterモバイル変換

Info

Publication number: CN111227929A
Application number: CN201811445303.9A
Authority: CN
Inventors: 汪宇; 秦杰; 汪虔; 金伟
Original assignee: Shanghai Anzhen Medical Technology Co ltd
Current assignee: Shanghai Anzhen Medical Technology Co ltd
Priority date: 2018-11-29
Filing date: 2018-11-29
Publication date: 2020-06-05

Abstract

The invention discloses an adjustable bronchus thermoforming catheter which comprises an electrode section, a main body tube and a handle, wherein the electrode section comprises an electrode, a positioning tube, a metal end cap, a metal tube, a temperature detection line, a pull wire, an adjusting wire and a spring; one end of the electrode and one end of the stay wire are fixed at the metal end cap, the other end of the electrode is fixed in the metal tube, the other end of the stay wire penetrates through the positioning tube to be connected with the extension knob on the handle, one end of the adjusting wire is fixed with the metal tube, the other end of the adjusting wire is connected with the extension knob on the handle, the far end of the spring is fixed with the adjusting wire, and the electrodes are distributed around the stay wire; the adjustable bronchus thermal forming catheter sub-needle is not easy to deform, and can be suitable for smaller bronchus and adjustable electrode length.

Description

Adjustable bronchus thermoforming pipe

Technical Field

The invention belongs to the field of medical instruments, and particularly relates to an adjustable bronchial tube thermal forming catheter.

Background

Radio frequency refers to radio frequency, but it does not belong to the division of bands in radio communication, and is less used in communication devices because of the low radiation performance in such a frequency range, and the effect on living organisms is mainly thermal effect. When the current frequency of radio frequency is higher than a certain value (>100kHz), the movement of ions with charges in tissues, namely, frictional heat generation (60-100 ℃) is caused. The frequency of the radio frequency ablation equipment is 200-500 kHz, the output power is determined according to different ablation tissues, and the frequency is about 20W for a bronchus generally.

Bronchial thermoplasty, an innovative asthma treatment technique, is to introduce an end cap through a bronchoscope, and thin the Airway Smooth Muscle (ASM) proliferated on the airway wall by using radio frequency energy (or heat), thereby reducing the contraction amplitude of the airway at the onset of asthma symptoms and reducing the frequency and severity of the attack.

The products in this field are currently mainly the Alair series products produced by boston technologies. The bronchus thermoforming catheter of the Alair series product is easy to deform in the using process, so that the service life is influenced, the operation treatment effect is influenced, the bronchus thermoforming catheter cannot act on an air passage with the diameter smaller than 3mm, the working surface of the bronchus thermoforming catheter is smaller, and the adjustable bending angle of the bronchus thermoforming catheter is also smaller.

Disclosure of Invention

The invention aims to solve the technical problem of providing an adjustable bronchus thermal forming catheter which is not easy to deform and can be suitable for smaller bronchus and adjustable electrode length.

In order to solve the problems, the invention adopts the following technical scheme:

an adjustable bronchus thermoforming catheter comprises an electrode section, a main body tube and a handle, wherein the electrode section comprises an electrode, a positioning tube, a metal end cap, a metal tube, a temperature detection line, a pull wire, an adjusting wire and a spring; the electrode and one end of the stay wire are fixed at the metal end cap, the other end of the electrode is fixed in the metal tube, the other end of the stay wire penetrates through the positioning tube to be connected with the extension knob on the handle, one end of the adjusting wire is fixed with the metal tube, the other end of the adjusting wire is connected with the extension knob on the handle, the far end of the spring is fixed with the adjusting wire, and the electrodes are distributed around the stay wire.

Furthermore, more than one electrode is distributed on the electrode section, and each electrode is arranged on the periphery of the stay wire.

Further, the electrode section further comprises a temperature detection line, the temperature detection line comprises a first end and a second end, the first end of the temperature detection line is arranged on any one of the electrodes, and the second end penetrates through the main body pipe and is connected with the handle; the surface of the temperature detection line except the first end part is coated with an insulating layer.

Further, the pull wire is connected with a stretching torsion on the handle to realize stretching and a ground state of the electrode relative to the pull wire.

Further, the adjusting wire is connected with a telescopic torque on the handle to realize the retraction and the ground state of the electrode relative to the main body.

Further, the adjusting wire realizes the extension of the electrode relative to the main body and the ground state through the connection with the spring.

Furthermore, the pull wire is made of stainless steel or nickel-titanium alloy, the adjusting wire is made of stainless steel or nickel-titanium alloy, and the spring is made of stainless steel or nickel-titanium alloy.

Further, the adjustable bronchial thermoplasty catheter is provided with a pull wire connected to the handle through the main tube, and the pull wire is under corresponding tension under corresponding control of the handle, so that the ground state and stretching are realized.

Further, the adjustable bronchial thermoplasty catheter is provided with an adjusting wire connected to the handle through the main tube, and the adjusting wire is under corresponding tension under corresponding control of the handle, so that the ground state and the extension and contraction are realized.

The invention has the beneficial effects that: the adjustable bronchus thermal forming catheter has the advantages that the length of the electrode can be adjusted, and the length of the electrode can be adjusted according to the size of the actual ablation area in the operation process; the length of the electrode of the like product in the prior art is fixed by 5mm, and if the ablation area is larger than 5mm in the operation process, the ablation times are required to be increased, and the operation time is increased; the scheme can greatly reduce the ablation times by utilizing the adjustable electrode, reduce the operation difficulty of an operator, shorten the operation time and reduce the pain of a patient.

Drawings

FIG. 1 is a schematic diagram of an adjustable bronchial thermoformed catheter in accordance with the present invention;

FIG. 2 is a schematic view of a sub-needle segment of an adjustable bronchial thermoformed catheter in accordance with the present invention;

FIG. 3 is a schematic view of a main tube of an adjustable bronchial thermoformed catheter in accordance with the present invention;

FIG. 4 is a schematic view of the structure of the proximal end of the electrode segment and the adjustment wire in the sub-needle segment of the adjustable bronchial thermoplasty catheter of the present invention;

FIG. 5 is a schematic view of the internal spring of the main tube of an adjustable bronchial thermoformed catheter in accordance with the present invention;

FIG. 6 is a schematic view of a handle structure of an adjustable bronchial thermoformed catheter of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in order to make the technical solution of the present invention easier to understand and understand.

As shown in fig. 1, an adjustable bronchial thermoplasty catheter comprises amain tube 2, an electrode segment 1, apull wire 104 connected to an electrode to transmit radio frequency energy and adjust the shape, atemperature detection wire 106 and anadjustment wire 107 to adjust the size of the electrode, a handle 3 for stretching the electrode and adjusting the size of the electrode, themain tube 2 comprising aflexible segment 201 at the distal end and a main segment connected to the handle 3, the electrode comprising a basket electrode. Thepull wire 104 is passed through themain tube 2 into the handle 3 to extend the electrode and is connected to the cable 4 to receive radio frequency energy. Thetemperature detection line 106 is transmitted into the handle 3 via themain body tube 2 to be connected to the cable 4 inside the handle 3 to output a temperature signal. The adjustingwire 107 and the proximal end of the electrode segment are fixedly transmitted into the handle 3 through themain tube 2 to stretch the electrode.

As shown in fig. 2, the electrode segment 1 is composed of a plurality ofelectrodes 103, wherein theelectrodes 103 are distributed around thepositioning tube 102 at the distal end of the electrodes by using thepositioning tube 102, theelectrodes 103 and thepull wires 104 are fixedly connected by using themetal end caps 101, such as resistance welding, tin welding, glue bonding, etc., an insulating layer is fixed on the surfaces of the metal end caps, and theelectrodes 102 and thepull wires 104 are fixedly connected by using themetal tubes 105 at the proximal end of the electrodes, such as resistance welding, tin welding, glue bonding, etc.

Theelectrode 102 is made of stainless steel, nickel-titanium alloy, platinum alloy and other metals, is flat and has a width of 1-0.3mm, and is preferably 304 stainless steel. Thepositioning tube 102 is made of a medical grade polymer material including, but not limited to, polyurethane, polypropylene, polycarbonate, modified nylon, and the like, preferably nylon; themetal end cap 101 andmetal tube 105 are stainless steel, nitinol, or the like, preferably 304 stainless steel. The insulating layer is PET, FEP, PTEF and the like, and preferably PET; thewire 104 is made of stainless steel, nickel titanium alloy, etc., and has an insulating layer on its surface, such as ETFE, PEA, FEP, PTFE, etc., preferably PTFE.

As shown in fig. 3, themain tube 2 is made of medical grade high molecular material including, but not limited to, polyurethane, polypropylene, polycarbonate, modified nylon, etc., preferably nylon.

The ground state and extension of the electrode 1 relative to thepuller wire 104 can be achieved by a control handle 3. When thecatheter 201 is not used, theelectrode 103 is in a ground state relative to thepull wire 104, so that the catheter can enter a bronchus or enter a corresponding bronchoscope, and for the ablation application of the bronchus, the catheter can be conveniently retracted into the bronchoscope and smoothly matched with the bronchoscope to be delivered to the vicinity of an ablation point of a complex structure in the bronchus, and the operation safety is improved. Under the state of stretching, the diameter of the electrode section 1 is increased, theelectrodes 103 are attached to the wall of the bronchus, the stretching degree of the electrode section 1 can be controlled by the handle 3, so that theelectrodes 103 can be effectively attached to the position of an ablation point, and the catheter can be kept to be effectively and moderately stretched in the bronchus, so that the bronchus can be prevented from being damaged due to excessive or local stimulation of radio frequency ablation while sufficient attachment force is ensured to perform sufficient radio frequency ablation on the bronchus.

The control handle 3 can be implemented using various mechanisms to switch between a ground state and an extended state of theelectrode 103 relative to thepuller wire 104. This can be achieved, for example, by using a pullingwire 104 which is connected to the handle 3 after passing through themain body tube 2, and switching between the ground state and the extended state is achieved by the degree of tension of thepulling wire 104.

As shown in fig. 4, theadjustment wire 107 is fixed to themetal tube 105 at the proximal end of the electrode segment 1, e.g. by resistance welding, tin welding, laser welding, etc.

The adjustingwire 107 is made of metal such as stainless steel, nickel-titanium alloy, platinum alloy and the like, and preferably stainless steel. Themetal tube 105 is made of metal such as stainless steel, nickel-titanium alloy and the like, and preferably stainless steel.

The electrode 1 can be extended and retracted relative to themain tube 2 by a control handle 3. When thecatheter 201 is not used, theelectrode 103 is in a ground state with respect to themain body tube 2. In the telescopic process, the length of the electrode section 1 can be changed in length, the length of the electrode section 1 can be controlled through the handle 3, the size of the adherence between eachelectrode 103 and the bronchial wall can be adjusted, the ablation times can be effectively reduced under the same ablation area, and the operation time can be shortened.

The control handle 3 can be implemented using a variety of mechanisms to switch between the ground and retracted states of the electrode segments 1 relative to themain tube 2. For example, the state can be switched between the ground state and the telescopic state by pushing and pulling the adjustingwire 107, which is connected to the handle 3 after passing through themain tube 2, using the adjustingwire 107.

As shown in fig. 5, the distal end of thespring 204 is secured to theadjustment wire 107, such as by resistance welding, laser welding, or the like.

Thespring 204 is made of metal such as stainless steel, nickel-titanium alloy and the like, and preferably stainless steel.

The electrode 1 can be extended and retracted relative to themain tube 2 by a control handle 3. When the adjustingwire 107 is understood, thespring 204 is pushed to generate a compression force. When the adjustingwire 107 is pushed, thespring 204 releases the compression force generated by the extrusion and returns to the original state. Releasing the compressive force better pushes the adjustingwire 107 distally.

As shown in fig. 6, the handle 3 includes ahandle head end 301, anextension knob 302, atelescopic knob 303, and a handlemain body 304. Thehandle head end 301 is fixedly connected with the main tube 3, the temperature monitoring wire, thepull wire 104 and the adjustingwire 107 in the catheter are transmitted into the handle 3, thepull wire 104 and thetemperature monitoring wire 106 are connected to the cable 4 at the proximal end of the handle, then the catheter is connected with a corresponding radio frequency instrument, so that the temperature signal acquired by the catheter is transmitted to the radio frequency instrument, and the radio frequency instrument transmits radio frequency energy to an ablation position through thepull wire 104 via themetal end cap 101 and eachelectrode 103.

The specific operation can be as follows:

ablation therapy of the location of the ablation point in the bronchus is carried out by the control handle 3: the catheter enters the ablation site of the bronchus via the bronchoscope; the length of the electrode section 1 is adjusted by pushing and pulling thetelescopic button 303 through the proximal end of the catheter, and the ablation area of theelectrode 102 is controlled. Theextension button 302 is pulled by the proximal end of the catheter, so that each electrode in the electrode section 1 is in an unfolded state and is attached to the ablation position, and the confirmation process can be finely adjusted according to the actual situation; then the quantity of the radio frequency instrument is transmitted to the position of an ablation point through a cable and a catheter, and the tissue ablation is realized.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention.

Claims

1. The utility model provides an adjustable bronchus thermoforming pipe, includes electrode segment, main part pipe and handle, its characterized in that: the electrode section comprises an electrode, a positioning tube, a metal end cap, a metal tube, a temperature detection line, a pull line, an adjusting wire and a spring; the electrode and one end of the stay wire are fixed at the metal end cap, the other end of the electrode is fixed in the metal tube, the other end of the stay wire penetrates through the positioning tube to be connected with the extension knob on the handle, one end of the adjusting wire is fixed with the metal tube, the other end of the adjusting wire is connected with the extension knob on the handle, the far end of the spring is fixed with the adjusting wire, and the electrodes are distributed around the stay wire.

2. The adjustable bronchial thermoformed catheter of claim 1, wherein: more than one electrode is distributed on the electrode section, and each electrode is arranged on the periphery of the stay wire.

3. The adjustable bronchial thermoformed catheter of claim 2, wherein: the electrode section further comprises a temperature detection line, the temperature detection line comprises a first end part and a second end part, the first end part of the temperature detection line is arranged on any one of the electrodes, and the second end part penetrates through the main body tube and is connected with the handle; the surface of the temperature detection line except the first end part is coated with an insulating layer.

4. The adjustable bronchial thermoformed catheter of claim 1, wherein: the pull wire is connected with a stretching torsion on the handle to realize the stretching and the ground state of the electrode relative to the pull wire.

5. The adjustable bronchial thermoformed catheter of claim 1, wherein: the adjusting wire is connected with a telescopic torque on the handle to realize the retraction and the ground state of the electrode relative to the main body.

6. The adjustable bronchial thermoformed catheter of claim 1, wherein: the adjusting wire realizes the extension and the ground state of the electrode relative to the main body through the connection with the spring.

7. An adjustable bronchial thermoformed catheter according to any one of claims 4-6, wherein: the pull wire is made of stainless steel or nickel-titanium alloy, the adjusting wire is made of stainless steel or nickel-titanium alloy, and the spring is made of stainless steel or nickel-titanium alloy.