CN110974406A

CN110974406A - Detection mechanism, radiofrequency ablation catheter and radiofrequency ablation system

Info

Publication number: CN110974406A
Application number: CN201911405072.3A
Authority: CN
Inventors: 王礼明; 徐宏; 周华珍
Original assignee: Hangzhou Kunbo Biotechnology Co Ltd
Current assignee: Hangzhou Kunbo Biotechnology Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-10

Abstract

The embodiment of the invention discloses a detection mechanism, a radio frequency ablation catheter and a radio frequency ablation system, which comprise: handle portion, syringe section, central electrode and detection mechanism. Wherein, needle tubing portion includes: a first shroud and a second shroud, the handle portion including: barrel casing and slide button, central electrode includes: electrode body, electrode wire and electrode joint, detection mechanism includes: the device comprises a fixed seat, a traction wire, a connecting seat and a plurality of claw-shaped electrodes. The distal end of the traction wire is fixed on the fixing seat, the proximal end of the traction wire is fixed on the sliding button, and the claw-shaped electrode is fixed on the fixing seat and can be slidably arranged in the connecting seat in a penetrating mode. Finally, the traction wire is pulled through the sliding button to drive the fixing seat to help the claw-shaped electrode to be pushed in and out of the connecting seat, so that the claw-shaped electrode is conveniently controlled by a user in the operation process to detect the temperature or impedance at the claw-shaped electrode, and further the ablation progress is judged.

Description

Detection mechanism, radiofrequency ablation catheter and radiofrequency ablation system

Technical Field

The embodiment of the invention relates to the field of medical instruments, in particular to a detection mechanism, a radio frequency ablation catheter and a radio frequency ablation system.

Background

Radio frequency ablation techniques are widely used in pulmonary treatment surgery. Radio frequency refers to radio frequency, but it does not belong to the division of bands in radio communications. The effect on the organism is mainly a thermal effect. When the current frequency of the radio frequency is high to a certain value (>100kHz), the movement of the charged ions in the tissue, namely, the frictional heating is caused (60 ℃ to 100 ℃). The frequency of the common use of the radiofrequency ablation equipment is 200-500 kHz, and the output power is 100-400 kHz. The ablation electrode is a core component of the radiofrequency ablation system, as it directly affects the size and shape of coagulation necrosis. The ideal shape of the coagulated region should be spherical or oblate spherical. Under the guidance of B-ultrasonic or CT, the multiple needle electrodes are directly pricked into a lesion tissue tumor mass, the temperature in the tissue can exceed 60 ℃ by the radio-frequency electrode needle, cells die, and a necrotic region is generated; if the local tissue temperature exceeds 100 ℃, the tumor tissue and the parenchyma surrounding the organ are subjected to coagulation necrosis, a large spherical coagulation necrosis area can be generated during treatment, and a heat treatment area of 43-60 ℃ is arranged outside the coagulation necrosis area, so that cancer cells can be killed in the area, and normal cells can be recovered.

During the treatment process, the radio frequency electrode is inserted into the human tissue, the current enters the focus through the radio frequency electrode, and a large amount of heat is generated at the radio frequency electrode, for example, when the temperature of the focus reaches 40-60 ℃ and is maintained for a period of time, the ablation operation of the focus is completed. However, the radio frequency ablation system in the prior art cannot judge the working state information of the radio frequency electrode, for example, cannot judge the temperature near the radio frequency electrode, so that the progress of the ablation operation can be judged and the adjustment operation can be performed only by the experience of a doctor in the operation process, and the operation difficulty and precision are increased. Therefore, how to provide a radio frequency ablation system which can accurately judge whether ablation is completed is a problem to be solved in the field.

Disclosure of Invention

The invention aims to provide a detection mechanism, a radio frequency ablation catheter and a radio frequency ablation system.

The embodiment of the invention provides a detection mechanism applied to a radio frequency ablation catheter, which comprises: the device comprises a fixed seat, a traction wire, a connecting seat and a plurality of claw-shaped electrodes;

the fixed seat is used for being arranged in the radiofrequency ablation catheter in a sliding mode;

the fixed seat is provided with a plurality of mounting holes, and each claw-shaped electrode respectively penetrates through the mounting holes and is fixedly connected with the fixed seat;

the far end of the traction wire is fixedly arranged on the fixed seat, and the near end of the traction wire is used for being fixed on a slide button of the radio frequency ablation catheter;

the connecting seat is used for being fixedly arranged in the radio frequency ablation catheter;

the connecting seat is provided with a plurality of guide holes, the extending directions of the openings of the adjacent guide holes are different, each claw-shaped electrode respectively passes through the guide hole, and the guide holes are used for enabling the claw-shaped electrodes to dispersedly extend out of the connecting seat;

each of the claw electrodes includes: the claw-shaped electrodes are distributed in an open type manner when extending out of the connecting seat in a distributed manner, and the far ends of the claw-shaped electrodes are located at different latitudes.

In one possible solution, the detection mechanism further comprises: and the far end of the fixing ring is fixedly arranged on the claw-shaped electrode, and the lead is electrically connected with the claw-shaped electrode.

In one possible embodiment, the adjacent guide holes of the detection mechanism are equally spaced.

In one possible embodiment, the distance between the opposite guide holes of the detection device is different.

An embodiment of the present invention provides a radio frequency ablation catheter, including: a handle portion, a needle tube portion, a central electrode, and a detection mechanism as described in any of the above;

the needle tube unit includes: a first pipe sleeve and a second pipe sleeve;

the connecting seat is specifically installed between the first pipe sleeve and the second pipe sleeve, the fixing seat is specifically installed in the first pipe sleeve in a sliding mode, and the fixing ring and the claw-shaped electrodes are located in the first pipe sleeve;

the handle portion includes: a barrel sleeve and a slide button;

the slide button is slidably mounted on the sleeve;

the near end of the traction wire is fixedly arranged on the slide button;

the center electrode includes: the electrode comprises an electrode body, an electrode lead and an electrode joint;

the electrode body is arranged at the far end of the second pipe sleeve, the far end of the electrode lead is electrically conducted with the electrode body, the electrode lead penetrates through the barrel sleeve, the first pipe sleeve and the second pipe sleeve, the near end of the electrode lead is electrically conducted with the electrode joint, and the electrode joint is positioned outside the barrel sleeve.

In one possible implementation, the rf ablation catheter further includes: the liquid injection joint and the liquid injection pipe;

the liquid injection pipe penetrates through the barrel sleeve, the fixed seat and the connecting seat, the electrode body is provided with a liquid inlet hole, and the far end of the liquid injection pipe is communicated with the liquid inlet hole;

the liquid injection joint is arranged at the near end of the liquid injection pipe and is positioned outside the barrel sleeve.

In a feasible scheme, a hole spraying channel is arranged in the electrode body of the radiofrequency ablation catheter and is communicated with the liquid inlet hole, and the hole spraying channel is used for dispersedly sending out liquid at the liquid inlet hole.

In a feasible scheme, an infiltration cover is arranged outside the electrode body of the radiofrequency ablation catheter, the infiltration cover comprises a plurality of infiltration holes distributed in a rectangular array, and the aperture of each row of infiltration holes is reduced from the near end to the far end in sequence.

In one possible embodiment, the infiltration holes of the radiofrequency ablation catheter are arranged in a staggered manner with respect to the sprinkling channel.

In one possible approach, the electrode body of the radiofrequency ablation catheter includes: the wetting cover is sleeved on the cylindrical part.

In a feasible scheme, a temperature sensor and a signal conduit are arranged in the electrode body of the radio frequency ablation catheter;

the electrode body is provided with a wire hole, the temperature sensor is positioned in the conical part, the signal conduit penetrates through the wire hole, an insulating layer is arranged outside the signal conduit, the far end of the signal conduit is electrically conducted with the temperature sensor, and the near end of the signal conduit is electrically conducted with the electrode joint.

In a feasible scheme, a clamping groove is formed in the electrode body of the radiofrequency ablation catheter, and the distal end of the second pipe sleeve is clamped on the clamping groove.

In one possible solution, the infiltration cover of the radiofrequency ablation catheter is made of an insulating high-temperature resistant material.

In one possible scheme, the material fiber material of the electrode body of the radio frequency ablation catheter is made of a fiber material.

In a feasible scheme, the second pipe sleeve of the radiofrequency ablation catheter is provided with internal threads, the connecting seat is provided with external threads, and the second pipe sleeve is in threaded connection with the connecting seat.

In a feasible scheme, the first pipe sleeve of the radiofrequency ablation catheter is provided with a countersunk hole, the near end of the connecting seat is provided with a threaded hole, and the first pipe sleeve and the connecting seat are fixed through bolts.

In one possible solution, the connection socket comprises: annotate the liquid hole, it is located to annotate the liquid hole on the central line of connecting seat, it is used for supplying to annotate the liquid hole the notes liquid pipe passes, the guiding hole with annotate the liquid hole and distribute as central symmetry, the guiding hole includes: a straight segment and an arcuate segment, the arcuate segment being located at a distal end of the straight segment.

In a feasible scheme, the inner side wall of the straight section of the guide hole of the radiofrequency ablation catheter is provided with anti-slip lines.

In a feasible scheme, an anti-abrasion cushion layer is arranged on the inner side wall of each arc-shaped section of the radiofrequency ablation catheter, and the anti-abrasion cushion layer is made of rubber.

In one possible embodiment, the connecting hub of the radiofrequency ablation catheter is made of a fiberglass material.

In a feasible scheme, a mounting column is arranged at the near end of the connecting seat of the radiofrequency ablation catheter, and a spring is arranged on the mounting column, so that when the fixing seat moves towards the connecting seat, the far end of the spring abuts against the connecting column, and the near end of the spring abuts against the fixing seat.

In one possible approach, the plurality of claw electrodes of the radiofrequency ablation catheter are hollow tubing.

In a feasible scheme, the outer side of the first section of each claw-shaped electrode of the radio frequency ablation catheter is sleeved with an insulating layer.

In a feasible scheme, the second section of each claw-shaped electrode of the radio frequency ablation catheter is sleeved with an insulating layer.

In one possible embodiment, the first section and the second section of the radiofrequency ablation catheter are straight sections, and the third section is an arc section.

In a feasible scheme, first grooves are formed in two sides of the fixed seat of the radiofrequency ablation catheter, and a clamping block is arranged at the distal end of the traction wire and embedded in the first grooves to fixedly connect the traction wire with the fixed seat.

In a possible scheme, the fixing seat of the radiofrequency ablation catheter is made of an electrical ceramic material.

In one possible scheme, the fixing ring of the radiofrequency ablation catheter is in interference fit with the fixing seat so as to limit the extending length of the claw-shaped electrode.

In a possible scheme, the fixing ring of the radiofrequency ablation catheter is made of silicon rubber.

In one possible solution, the fixing ring of the radiofrequency ablation catheter is a hollow cylinder, and the fixing ring is provided with a split.

In one possible scheme, cushion pads are arranged at two ends of the fixing ring of the radiofrequency ablation catheter.

In one possible solution, said cushion of the radiofrequency ablation catheter is made of an elastic rubber material.

In one possible solution, the holder of the rf ablation catheter includes: female fixed ring and the public fixed ring of concatenation each other.

In one possible approach, the female fixation ring and the male fixation ring of the radiofrequency ablation catheter are hinged by a hinge shaft.

The embodiment of the invention also provides a radio frequency ablation system, which comprises the radio frequency ablation catheter in any one of the feasible schemes.

Based on the above scheme, the detection mechanism, the rf ablation catheter and the rf ablation system of the present invention include: handle portion, syringe section, central electrode and detection mechanism. Wherein, needle tubing portion includes: a first shroud and a second shroud, the handle portion including: barrel casing and slide button, central electrode includes: electrode body, electrode wire and electrode joint, detection mechanism includes: the fixed ring, fixing base, pull wire, connecting seat and a plurality of claw shape electrodes. The detection mechanism, the radio frequency ablation catheter and the radio frequency ablation system of the invention take a user as a standard, one end close to the user is a near end, and the other end far away from the user is a far end. The connecting seat is installed between first pipe box and second pipe box, and the fixing base is located the near-end of connecting seat, and fixing base, solid fixed ring and a plurality of claw shape electrodes all set up in first pipe box, and the fixing base can slide in first pipe box, and solid fixed ring installs the near-end at the fixing base, and solid fixed ring fixes on claw shape electrode, and claw shape electrode wears to establish in the fixing base. The claw-shaped electrode can slide in the connecting seat, and when the claw-shaped electrode extends out of the connecting seat, the claw-shaped electrode is distributed in an open mode and is positioned on different latitudes. The sliding button can slide on the surface of the sleeve, the near end of the traction wire is fixed on the sliding button, and the far end of the traction wire is fixed on the fixed seat. The electrode body is located at the far end of the second pipe sleeve, the far end of the electrode lead is fixed in the electrode body and is electrically conducted, the near end of the electrode lead is electrically conducted with the electrode joint, and the electrode joint is located on the outer side of the barrel sleeve. A plurality of claw shape electrodes pass through the connecting seat, fixing base and pull wire can impel and the release motion in needle tubing portion, when needs push out needle tubing portion with claw shape electrode and examine time measuring, can be with smooth button toward distal end propelling movement, thereby smooth button drives the pull wire and drives the fixing base toward distal end propelling movement, at this moment, fix claw shape electrode on the fixing base because the fixing base is toward the distal end and is gone, so claw shape electrode is also toward distal end propelling movement equally, thereby will originally receive claw shape electrode in the connecting seat and has pushed out needle tubing portion. When the claw-shaped electrode is not needed to be used for detection, the sliding button is only needed to be retracted towards the near end, the sliding button drives the traction wire, the traction wire pulls the fixing seat to pull back the claw-shaped electrode on the fixing seat, and at the moment, the claw-shaped electrode which is originally positioned on the outer side of the needle tube portion can be retracted into the connecting seat again. The traction wire and the fixing seat are driven by the sliding button, so that the claw-shaped electrode is finally pushed out and retracted, and a user can conveniently control the claw-shaped electrode in the operation process. In the process of radiofrequency ablation, the claw-shaped electrode can be pushed forwards and backwards through the handle sliding button to control the claw-shaped electrode to expand and contract, so that the auxiliary positioning of the position of the electrode body is realized, the conditions around the electrode body are obtained through the claw-shaped electrode, and the ablation progress is judged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic overall structure diagram of a radio frequency ablation catheter in accordance with a first embodiment of the present invention;

FIG. 2 is an enlarged partial view of a needle portion of a radio frequency ablation catheter in accordance with a first embodiment of the present invention;

FIG. 3 is a view of the connection between the fixing base and the fixing ring of the RF ablation catheter in accordance with the first embodiment of the present invention;

fig. 4 is a schematic view of a fixing base structure of a radio frequency ablation catheter in accordance with a first embodiment of the present invention;

fig. 5 is a schematic position diagram of the connection seat and the spring of the rf ablation catheter according to the first embodiment of the invention;

FIG. 6 is a first cross-sectional view of a coupling hub of a RF ablation catheter in accordance with a first embodiment of the present invention;

FIG. 7 is a second cross-sectional view of the coupling hub of the RF ablation catheter in accordance with one embodiment of the present invention;

FIG. 8 is a schematic view of the overall structure of the infiltration cover of the RF ablation catheter in accordance with the first embodiment of the present invention;

FIG. 9 is a cross-sectional view of an infiltration cover of the RF ablation catheter in accordance with one embodiment of the present invention;

FIG. 10 is a schematic view of the connection between the second sheath and the infiltration cover of the RF ablation catheter in accordance with the first embodiment of the present invention;

FIG. 11 is a left side view of the holder of the RF ablation catheter in accordance with the first embodiment of the present invention;

fig. 12 is a schematic view of a claw electrode structure of the rf ablation catheter in accordance with the first embodiment of the present invention.

Reference numbers in the figures:

1. a needle tube portion; 11. a first pipe sleeve; 111. a countersunk hole; 12. a second pipe sleeve; 121. an internal thread; 2. a handle portion; 21. a barrel sleeve; 22. a slide button; 23. an electrode tab; 24. a liquid injection joint; 25. a liquid injection pipe; 26. an electrode lead; 3. a center electrode; 31. an electrode body; 311. a liquid inlet hole; 312. a hole sprinkling channel; 32. soaking the cover; 321. infiltrating the pores; 33. a temperature sensor; 34. a wiring hole; 35. a card slot; 4. a fixing ring; 41. a breach; 42. a cushion pad; 5. a fixed seat; 51. mounting holes; 52. passing through the aperture; 53. a first groove; 54. a clamping block; 55. a male retaining ring; 551. a bump; 56. a female retaining ring; 561. a second groove; 57. hinging a shaft; 6. a connecting seat; 61. a guide hole; 611. a straight line segment; 6111. anti-skid lines; 612. an arc-shaped section; 6121. an anti-wear cushion layer; 62. a liquid injection hole; 63. an external thread; 64. a threaded hole; 65. mounting a column; 7. a claw-shaped electrode; 71. a first stage; 72. a second stage; 73. a third stage; 8. a spring; 9. an insulating layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the indicated orientations and positional relationships based on the drawings for convenience in describing and simplifying the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication connection; either directly or indirectly through intervening media, either internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 1 is a schematic overall structure diagram of a radio frequency ablation catheter in accordance with a first embodiment of the present invention; FIG. 2 is an enlarged partial view of a needle portion of a radio frequency ablation catheter in accordance with a first embodiment of the present invention; FIG. 3 is a view of the connection between the fixing base and the fixing ring of the RF ablation catheter in accordance with the first embodiment of the present invention; fig. 4 is a schematic view of a fixing base structure of a radio frequency ablation catheter in accordance with a first embodiment of the present invention; fig. 5 is a schematic position diagram of the connection seat and the spring of the rf ablation catheter according to the first embodiment of the invention; FIG. 6 is a first cross-sectional view of a coupling hub of a RF ablation catheter in accordance with a first embodiment of the present invention; FIG. 7 is a second cross-sectional view of the coupling hub of the RF ablation catheter in accordance with one embodiment of the present invention; FIG. 8 is a schematic view of the overall structure of the infiltration cover of the RF ablation catheter in accordance with the first embodiment of the present invention; FIG. 9 is a cross-sectional view of an infiltration cover of the RF ablation catheter in accordance with one embodiment of the present invention; FIG. 10 is a schematic view of the connection between the second sheath and the infiltration cover of the RF ablation catheter in accordance with the first embodiment of the present invention; FIG. 11 is a left side view of the holder of the RF ablation catheter in accordance with the first embodiment of the present invention; fig. 12 is a schematic view of a claw electrode structure of the rf ablation catheter in accordance with the first embodiment of the present invention.

The radio frequency ablation catheter in the present embodiment as shown in fig. 1 comprises: handle 2, needle tube 1, center electrode 3 and detection mechanism. Wherein, needle tubing portion 1 includes: a first sleeve 11 and a second sleeve 12, the handle portion 2 including a sleeve 21 and a slide button 22, the center electrode 3 including: electrode body 31, electrode wire 26 and electrode joint 23, the detection mechanism includes: a fixed ring 4, a fixed seat 5, a traction wire (not shown), a connecting seat 6 and a plurality of claw-shaped electrodes 7. Based on the user, the end close to the user is the near end, and the end far away from the user is the far end. The radiofrequency ablation catheter comprises a barrel sleeve 21, a first pipe sleeve 11, a fixing ring 4, a fixing seat 5, a connecting seat 6, a second pipe sleeve 12 and a center electrode 3 from near to far in sequence.

The barrel sleeve 21 is located at the proximal end of the needle tube part 1, the first tube sleeve 11 is sleeved at the distal end of the barrel sleeve 21, the electrode connector 23 is located at the proximal end of the barrel sleeve 21, the proximal end of the electrode lead 26 is electrically connected with the electrode connector 23, and the distal end of the electrode lead 26 is inserted into the electrode body 31 and is electrically connected with the electrode body 31. The electrode body 31 is located at the distal end of the needle cannula part 1 and fixed at the distal end of the second hub 12. The electrode body 31 is made of a fiber material. The electrode lead 26 passes through the barrel housing 21, the first pipe housing 11, the fixing base 5, the connecting base 6, the second pipe housing 12 and the electrode body 31, respectively.

As shown in fig. 12, the claw electrode 7 includes: a first section 71, a second section 72 and a third section 73. The first section 71 is proximal, the second section 72 is intermediate, the third section 73 is distal, the first section 71 and the second section 72 form an obtuse angle, and the second section 72 and the third section 73 form an obtuse angle. The claw electrode may acquire an impedance value of a contact position, or the claw electrode itself may be made of a thermosensitive material for acquiring a maximum temperature around the claw electrode. That is, with the claw electrode, the detection device can detect the temperature or impedance at the claw electrode to determine the progress of ablation.

Referring to fig. 4, the fixing base 5 is located in the first pipe sleeve 11, and the fixing base 5 can slide in the first pipe sleeve 11. Four mounting holes 51 are formed in the holder 5, and the four mounting holes 51 are used to fix the claw-shaped electrode 7. Alternatively, the claw-shaped electrode 7 is fixed in the mounting hole 51 by means of dispensing, that is, the claw-shaped electrode 7 is fixedly arranged in the mounting hole 51 by an adhesive. Alternatively, the claw electrode 7 is fixed in the mounting hole 51 by welding, that is, the claw electrode 7 is welded to the mounting hole 51. A through hole 52 is provided on the center line of the fixed base 5, and four mounting holes 51 are symmetrically distributed with the through hole 52 as the center. Through the aperture 52 for the signal conduit and the infusion tubing 25. A pull wire (not shown) is fixed to the distal end of the anchor block 5.

Referring to fig. 3, the fixing ring 4 is located in the first sleeve 11, the fixing ring 4 is located at the proximal end of the fixing base 5, the distal end of the fixing ring 4 is fixed on the claw electrode 7, and the proximal end of the fixing ring 4 is used for fixing an external lead and electrically connecting the lead and the claw electrode. An external lead passes through the barrel sleeve 21 and the first barrel sleeve 11, the near end of the external lead is fixed on the electrode joint 23, the far end of the external lead is fixed on the fixing ring 4, the first section 71 of the claw-shaped electrode 7 penetrates out of the fixing seat 5 and enters the fixing ring 4, and the far end of the external lead enters the fixing ring 4 from the near end of the fixing ring 4. In the fixing ring 4, the first section 71 of the claw electrode 7 is in contact with the distal end of the external lead to form an electrical connection. The electrode joint 23 is externally connected with a radio frequency ablation system, and current is transmitted to the claw-shaped electrode 7 through an external lead and then is released to human tissues through the claw-shaped electrode 7.

A slide button 22 is mounted on the surface of the sleeve 21, and the slide button 22 is slidable on the surface of the sleeve 21. The distal end of the pull wire (not shown) is fixed on the fixed base 5, and the proximal end of the pull wire (not shown) is fixed on the slide button 22. The slide button 22 is pushed forward and backward to drive the traction wire forward or backward, and one end of the traction wire is fixed on the fixing base 5, so that the traction wire (not shown) can drive the fixing base 5 to slide in the first pipe sleeve 11. The claw-shaped electrode 7 is fixed in the fixing seat 5, and the claw-shaped electrode 7 fixed in the fixing seat 5 can move forwards or backwards along with the fixing seat 5 because the fixing seat 5 slides forwards or backwards. Optionally, the claw-shaped electrode 7 is fixedly connected with the fixed seat 5 through an adhesive and is a moving whole.

As shown in fig. 7, the connecting socket 6 is located between the first socket 11 and the second socket 12, and the first socket 11 and the second socket 12 are fixed at the proximal end and the distal end of the connecting socket 6, respectively. Four guide holes 61 are formed in the connecting base 6, and the opening extending directions of every two adjacent guide holes 61 are different. The four guide holes 61 are respectively located in four directions of the connecting seat 6, and the four guide holes 61 are circumferentially distributed in an array with the central axis of the connecting seat 6 as the center, so that the distance between every two adjacent guide holes 61 in the four guide holes 61 is the same. The distance between two pairs of opposing guide holes 61 is the same. The claw-shaped electrodes 7 are slidably inserted through guide holes 61 in the connecting socket 6, and these guide holes 61 allow the claw-shaped electrodes 7 to be extended out of the connecting socket 6 in a distributed manner. The four claw-shaped electrodes 7 are independent from each other and do not interfere with each other. Since the claw-shaped electrode 7 is divided into the first section 71, the second section 72 and the third section 73, when the claw-shaped electrode 7 extends out of the connecting seat 6, the first section 71 is still positioned inside the guide hole 61, the second section 72 and the third section 73 extend out of the guide hole 61 of the connecting seat 6 by the thrust of the fixing seat 5, and the first section 71, the second section 72 and the third section 73 respectively form an obtuse angle, so that the claw-shaped electrode 7 extends out of the connecting seat 6 in an opening-type distribution, and the lengths of the claw-shaped electrode 7 extending out of the needle tube part 1 are different, and since the positions of the four guide holes 61 in the connecting seat 6 are corresponding, and the positions of the distal openings of the guide holes 61 are the same relative to the connecting seat 6, when the claw-shaped electrode 7 extends out of the guide holes 61, the distal ends of the claw-shaped electrode 7 are positioned at different latitudes, so as to enrich the working range.

The radiofrequency ablation catheter is applied to a radiofrequency ablation system, and the radiofrequency ablation system comprises a radiofrequency generator (ablator), wherein the radiofrequency generator (ablator) is used for being connected with the radiofrequency ablation catheter and providing an electric signal for an electrode joint of the radiofrequency ablation catheter, so that the central electrode and the claw-shaped electrode work.

From the above, it can be seen that the rf ablation catheter of the present invention comprises: handle 2, needle tube 1, center electrode 3 and detection mechanism. Wherein, needle tubing portion 1 includes: a first sleeve 11 and a second sleeve 12, the handle portion 2 comprising: a sleeve 21 and a slide button 22, the center electrode 3 includes: electrode body 31, electrode wire 26 and electrode joint 23, the detection mechanism includes: the fixed ring 4, the fixing seat 5, the traction wire, the connecting seat 6 and a plurality of claw-shaped electrodes 7. The detection mechanism, the radio frequency ablation catheter and the radio frequency ablation system of the invention take a user as a standard, one end close to the user is a near end, and the other end far away from the user is a far end. Connecting seat 6 is installed between first pipe box 11 and second pipe box 12, and fixing base 5 is located the near-end of connecting seat 6, and fixing base 5, solid fixed ring 4 and a plurality of claw shape electrode 7 all set up in first pipe box 11, and fixing base 5 can slide in first pipe box 11, and solid fixed ring 4 is installed at the near-end of fixing base 5, and solid fixed ring 4 is fixed on claw shape electrode 7, and claw shape electrode 7 wears to establish in fixing base 5. The claw-shaped electrode 7 can slide in the connecting seat 6, and when the claw-shaped electrode 7 extends out of the connecting seat 6, the claw-shaped electrode 7 is distributed in an open manner and is positioned at different latitudes. The slide button 22 can slide on the surface of the sleeve 21, the proximal end of the traction wire is fixed on the slide button 22, and the distal end of the traction wire is fixed on the fixed seat 5. The electrode body 31 is located at the distal end of the second sleeve 12, the distal end of the electrode lead 26 is fixed in the electrode body 31 and electrically connected, the proximal end of the electrode lead 26 is electrically connected with the electrode connector 23, and the electrode connector 23 is located at the outer side of the sleeve 21. A plurality of claw shape electrodes 7 pass through connecting seat 6, fixing base 5 and pull wire can impel and the release motion at needle tubing portion 1, when needs push away claw shape electrode 7 needle tubing portion 1 and examine time measuring, can be with smooth button 22 toward distal end propelling movement, thereby smooth button 22 drives the pull wire and drives fixing base 5 toward distal end propelling movement, at this moment, fix claw shape electrode 7 on fixing base 5 because fixing base 5 travels toward the distal end, so claw shape electrode 7 is also toward distal end propelling movement equally, thereby will originally receive claw shape electrode 7 in connecting seat 6 and have pushed away needle tubing portion 1. When the claw-shaped electrode 7 is not needed to be used for detection, the sliding button 22 is only needed to be retracted towards the near end, the sliding button 22 drives the traction wire, the traction wire pulls the fixing seat 5 to pull back the claw-shaped electrode 7 on the fixing seat 5, and at the moment, the claw-shaped electrode 7 which is originally positioned on the outer side of the needle tube part 1 can be retracted into the connecting seat 6 again. The slide button 22 drives the traction wire and the fixing seat 5, so that the claw-shaped electrode 7 is finally pushed out and retracted, and a user can conveniently control the claw-shaped electrode 7 in the operation process. When the detection device is used for surgery, the needle tube part is stretched into a human body, for example, the needle tube part is stretched into a human trachea, when the claw-shaped electrode is opened through the slide button, the claw-shaped electrode can be supported on the inner wall of the human trachea, a stabilizing effect is achieved on the central electrode, and meanwhile, the claw-shaped electrode can also acquire the temperature or impedance data of the human trachea, so that the surgery condition of the central electrode is obtained.

Optionally, in this embodiment, the rf ablation catheter further includes: a liquid injection joint 24 and a liquid injection pipe 25. A priming connector 24 is located at the proximal end of the cartridge 21, the priming connector 24 being for external connection to a syringe. The proximal end of the liquid injection tube 25 is connected with the liquid injection joint 24, and the distal end of the liquid injection tube 25 is inserted into the electrode body 31. The liquid injection pipe 25 penetrates through the barrel sleeve 21, the first pipe sleeve 11 and the second pipe sleeve 12, and the liquid injection pipe 25 passes through the barrel sleeve 21, the fixed seat 5 and the connecting seat 6 respectively. The liquid inlet hole 311 is arranged on the electrode body 31, the liquid inlet hole 311 is positioned in the middle of the electrode body 31, and the liquid inlet hole 311 is connected with the far end of the liquid injection pipe 25. The brine pushed from the liquid injector finally enters the electrode body 31 through the liquid injection joint 24, the liquid injection pipe 25 and the liquid inlet hole 311.

As shown in fig. 9, optionally, in the present embodiment, the electrode body 31 includes: a cylindrical portion and a tapered portion. The tapered portion is located at a distal end of the cylindrical portion. A wetting cover 32 is provided outside the electrode body 31. The infiltration cover 32 is made of a high temperature resistant insulating material. The immersion cover 32 is fitted over the cylindrical portion of the electrode body 31. The inside of the electrode body 31 is provided with two groups of sprinkling hole channels 312 which are distributed in a cross shape and are communicated with the liquid inlet hole 311. The brine flowing through the liquid injection pipe 25 is dispersed into the sprinkling hole passage 312 by the brine concentrated in the liquid inlet hole 311. On the surface of the infiltration cover 32, there are a plurality of infiltration holes 321 distributed in a rectangular shape, and the aperture of each row of infiltration holes 321 decreases from the proximal end to the distal end. The plurality of wetting holes 321 are in communication with the sprinkler channel 312 and are staggered from the sprinkler channel 312. The surfaces of the infiltration cover 32 and the electrode body 31 are provided with certain gaps, the saline in the sprinkling channel 312 can flow through the infiltration cover 32 through the gaps, and the saline flows out through the infiltration holes 321 due to the plurality of infiltration holes 321 arranged on the surface of the infiltration cover 32, so that the saline is dispersed in the human tissues.

Optionally, in the present embodiment, a temperature sensor 33 and a signal conduit are further disposed in the electrode body 31. A wiring hole 34 is formed in the electrode body 31, the wiring hole 34 is located at one side of the liquid inlet hole 311, and a signal conduit is inserted into the wiring hole 34. The temperature sensor 33 is located on the surface of the tapered portion of the electrode body 31, the temperature sensor 33 is electrically connected to the distal end of the signal conduit, and the proximal end of the signal conduit is fixed to the electrode connector 23 and is electrically connected to the electrode connector 23. A rubber insulating layer 9 is arranged outside the signal conduit. The temperature sensor 33 may be a thermistor which is sensitive to temperature and exhibits different resistance values at different temperatures, the resistance value being lower at higher temperatures. After the infiltration holes 321 infiltrate saline into the tissue of the human body, the ablation process is started, and the temperature of the ablation area is continuously changed along with the continuous increase of the ablation saline. When the temperature is higher and higher, the resistance value of the thermistor in the local range is reduced along with the increase of the temperature, and the thermistor is electrically conducted with the signal conduit. When the resistance value of the thermistor changes, the change of the resistance value is transmitted to the radiofrequency ablation system through a signal conduit (not shown), the far end of the signal conduit is connected with the thermistor, and the near end of the signal conduit is fixed on the electrode joint 23. The local temperature variation range of the resistance value is calculated according to the variation of the resistance value on the radio frequency ablation system, so that the temperature can be further controlled through the flow of saline water, and the temperature variation in the human tissue can be visually observed on the radio frequency ablation system.

As shown in fig. 8, optionally, in this embodiment, there is a locking slot 35 at the proximal end of the electrode body 31, and the outer wall of the second sleeve 12 is inserted into the locking slot 35, so that the electrode body 31 and the second sleeve 12 can be fixed. The second socket 12 has an internal thread 121 at a proximal end thereof and an external thread 63 at a distal end thereof, and the coupling holder 6 is threadedly coupled with the second socket 12.

Optionally, in this embodiment, a threaded hole 64 is formed at the proximal end of the connecting seat 6, a countersunk hole 111 is formed at the distal end of the first socket 11, a bolt is inserted into the countersunk hole 111 and the threaded hole 64 to fix the connecting seat 6 and the first socket 11, the connecting seat 6 and the first socket 11 are fastened during the continuous tightening process of the bolt, when the bolt is screwed into the threaded hole 64 completely, the surface of the bolt is parallel to the surface of the connecting seat 6, and the bolt is hidden in the countersunk hole 111.

Alternatively, in the present embodiment, a liquid injection hole 62 is provided on the center line of the connecting base 6. The injection tube 25 and the signal conduit are arranged in the injection hole 62 in a penetrating way. The four guide holes 61 on the connecting base 6 are symmetrically distributed with the liquid injection hole 62 as the center. The pouring hole 62 is used to fix the position of the pouring spout 25 so that the sliding path of the pouring spout 25 does not deviate. The guide hole 61 includes: straight segment 611 and arcuate segment 612, straight segment 611 being located at a proximal end of arcuate segment 612. Since the first, second and

third segments

71, 72 and 73 of the claw-shaped electrode 7 are connected to each other at an obtuse angle, the connection between the straight segment 611 and the arc-shaped segment 612 of the guide hole 61 can help the claw-shaped electrode 7 to slide. The arc-shaped section 612 facilitates the independent and smooth expansion and contraction of the claw-shaped electrode 7, and increases the supporting force and the expansion range of the claw-shaped electrode 7. The inner side wall of the straight line segment 611 of the guide hole 61 is provided with anti-slip lines 6111. The non-slip pattern 6111 in the straight section 611 helps the claw electrode 7 to be fixed in position and remain stationary when the claw electrode 7 is extended out of the needle cannula portion 1. An anti-abrasion cushion layer 6121 made of silica gel is arranged on the inner side wall of each arc-shaped section 612, and the anti-abrasion cushion layer 6121 is positioned between the arc-shaped section 612 and the claw-shaped electrode 7. When the claw-shaped electrode 7 is pushed out or pulled into the connecting seat 6, friction force is generated between the claw-shaped electrode 7 and the surface of the arc-shaped section 612, so that the surface of the claw-shaped electrode 7 can be damaged, and after the abrasion-proof cushion layer 6121 is added, abrasion on the surface of the claw-shaped electrode 7 can be reduced.

As shown in fig. 5, optionally, in the present embodiment, the proximal end of the connecting base 6 is provided with a mounting post 65, and the mounting post 65 is sleeved with a spring 8. When the claw-shaped electrode 7 extends out of the needle tube part 1, the fixing seat 5 can move towards the connecting seat 6, when the fixing seat 5 moves towards the connecting seat 6, the far end of the spring 8 is propped against the near end of the connecting seat 6, and the near end of the spring 8 is propped against the fixing seat 5. The spring 8 is added, so that the buffer force when the claw-shaped electrode 7 is extended out of the connecting seat 6 can be increased, and the claw-shaped electrode 7 is kept still.

As shown in fig. 12, alternatively, in this embodiment, the claw electrode 7 is hollow, the insulating layers 9 made of rubber material are disposed on the surfaces of the first section 71 and the second section 72 of the claw electrode 7, the current is transmitted to the claw electrode 7 through the conductive tube, which may cause signal interference, and a layer of rubber is disposed on the surface of the claw electrode 7, which may reduce the signal interference and shield the signal. The first section 71 and the second section 72 of the claw electrode 7 are both straight line sections 611, and the third section 73 is an arc section.

Referring to fig. 4, in the present embodiment, two first grooves 53 are optionally formed on the surface of the fixing base 5, and a latch 54 is disposed at the distal end of the pulling wire. The first groove 53 is used to fix the traction wire. When the pull wire needs to be clamped into the first groove 53, the clamping block 54 on the pull wire can be directly pushed into the first groove 53, so that the clamping block 54 on the pull wire is just clamped on the first groove 53, and the pull wire is fixed on the fixing seat 5 through the matching of the clamping block 54 and the first groove 53.

As shown in fig. 3, in the present embodiment, the fixing ring 4 is designed as a hollow ring, and a slit 41 is provided on the fixing ring 4, through which slit 41 the claw electrode 7 and the external lead can be placed, and the claw electrode 7 and the external lead can be placed. The fixed ring 4 is in interference fit with the claw-shaped electrode 7, the diameter of the fixed ring 4 is larger than that of the mounting hole 51 on the fixed seat 5, so that the fixed seat 5 cannot fall off from the claw-shaped electrode 7 because the diameter of the fixed ring 4 is larger than that of the mounting hole 51 when the traction wire pulls the fixed seat 5 back. Cushions 42 made of an elastic rubber material are provided at both ends of the fixing ring 4. Because the fixed ring 4 is in interference fit with the claw-shaped electrode 7 and the external lead, the claw-shaped electrode 7 and the external lead are greatly abraded at the places where the pressures of the two ends of the fixed ring 4 to the claw-shaped electrode 7 and the external lead are the maximum respectively, after the cushion pad 42 is added, the stress concentration phenomenon at the two ends of the fixed ring 4 can be reduced, and the service lives of the claw-shaped electrode 7 and the external lead are prolonged.

As shown in fig. 11, optionally, in this embodiment, the fixing base 5 includes: a male retaining ring 554 and a female retaining ring 564. The retaining bracket 5 is divided into a front retaining ring 4 and a rear retaining ring 4, and the male retaining ring 554 and the female retaining ring 564 are closed to form a complete retaining bracket 5. One ends of the male fixing ring 554 and the female fixing ring 564 are hinged by a hinge shaft 57, a second groove 561 is provided on the other end of the female fixing ring 564, a projection 551 is provided on the other end of the male fixing ring 554, and the other ends of the male fixing ring 554 and the female fixing ring 564 are inserted into the second groove 561 through the projection 551 for clamping connection.

The second embodiment is an alternative of the first embodiment, and is characterized in that the connecting seat 6 is made of glass fiber. The glass fiber has good insulativity, strong heat resistance, corrosion resistance and high mechanical strength.

The third embodiment is an alternative of the first embodiment, and is characterized in that the fixing base 5 is made of an electrical ceramic material. The electrical ceramic is a ceramic insulating material, has good insulativity and mechanical strength, and has good mechanical property, electrical property and environmental resistance.

The fourth embodiment is an alternative of the first embodiment, and is characterized in that the fixing ring 4 is made of silicon rubber. The silicon rubber has high-temperature stability and can still keep certain flexibility and elasticity in a high-temperature environment.

In the present invention, unless otherwise explicitly specified or limited, the first feature "on" or "under" the second feature may be directly contacting the first feature and the second feature or indirectly contacting the first feature and the second feature through an intermediate.

Also, a first feature "on," "above," and "over" a second feature may mean that the first feature is directly above or obliquely above the second feature, or that only the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lower level than the second feature.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A detection mechanism applied to a radio frequency ablation catheter is characterized by comprising: the device comprises a fixed seat, a traction wire, a connecting seat and a plurality of claw-shaped electrodes;

the far end of the traction wire is fixedly arranged on the fixed seat;

2. The detection mechanism of claim 1, further comprising: the far end of the fixing ring is fixedly arranged on the claw-shaped electrode, and the near end of the fixing ring is used for being externally connected with a lead and enabling the lead to be electrically connected with the claw-shaped electrode.

3. The sensing mechanism of claim 1, wherein the spacing between adjacent ones of said guide holes is the same.

4. The sensing mechanism of claim 1, wherein the spacing between opposing guide holes is different.

5. A radio frequency ablation catheter, comprising: a handle portion, a needle cannula portion, a central electrode, and the detection mechanism of any one of claims 1 to 4;

the needle tube unit includes: a first pipe sleeve and a second pipe sleeve;

the handle portion includes: a barrel sleeve and a slide button;

the slide button is slidably mounted on the sleeve;

the near end of the traction wire is fixedly arranged on the slide button;

6. The radiofrequency ablation catheter of claim 5, further comprising: the liquid injection joint and the liquid injection pipe;

7. The rf ablation catheter of claim 6, wherein a plurality of hole-sprinkling channels are provided in the electrode body, the hole-sprinkling channels being in communication with the fluid inlet holes, the hole-sprinkling channels being adapted to distribute fluid away from the fluid inlet holes.

8. The radiofrequency ablation catheter of claim 7, wherein a infiltration cover is disposed outside the electrode body, the infiltration cover includes a plurality of infiltration holes distributed in a rectangular array, and the aperture of each row of infiltration holes decreases from the proximal end to the distal end.

9. The rf ablation catheter of claim 8, wherein the infiltration holes are offset from the nozzle channel.

10. The radiofrequency ablation catheter of claim 8, wherein the electrode body comprises: the wetting cover is sleeved on the cylindrical part.

11. The rf ablation catheter of claim 10, wherein a temperature sensor and a signal conduit are provided in the electrode body;

12. The rf ablation catheter of claim 10, wherein the electrode body has a notch, and the distal end of the second sleeve is engaged with the notch.

13. The rf ablation catheter of any of claims 8-12, wherein the infiltration cover is made of an insulating refractory material.

14. The radiofrequency ablation catheter of claim 5, wherein the second sleeve is internally threaded and the connecting hub is externally threaded, the second sleeve and the connecting hub being threadably connected.

15. The radiofrequency ablation catheter of claim 5, wherein the first sleeve is provided with a counter bore, the proximal end of the connecting base is provided with a threaded bore, and the first sleeve and the connecting base are secured by a bolt.

16. The radiofrequency ablation catheter of claim 5, wherein the attachment hub comprises: annotate the liquid hole, it is located to annotate the liquid hole on the central line of connecting seat, it is used for supplying to annotate the liquid hole the notes liquid pipe passes, the guiding hole with annotate the liquid hole and distribute as central symmetry, the guiding hole includes: a straight segment and an arcuate segment, the arcuate segment being located at a distal end of the straight segment.

17. The rf ablation catheter of claim 16, wherein the inner side wall of the straight section of the guide hole is provided with an anti-slip texture.

18. The rf ablation catheter of claim 16, wherein an anti-wear pad layer is disposed on an inner sidewall of each arcuate segment, the anti-wear pad layer being made of rubber.

19. The rf ablation catheter of claim 16, wherein the attachment hub is made of fiberglass material.

20. The rf ablation catheter of claim 16, wherein the proximal end of the connecting hub defines a post, the post defining a spring, such that when the retaining hub is moved toward the connecting hub, the distal end of the spring abuts the post, and the proximal end of the spring abuts the retaining hub.

21. The radiofrequency ablation catheter of claim 5, wherein the plurality of claw electrodes are hollow tubing.

22. The rf ablation catheter of claim 5, wherein an insulating layer is disposed over the first section of each of the claw electrodes.

23. The radio frequency ablation catheter of claim 5, wherein an insulating layer is sheathed on the outside of the second section of each claw electrode.

24. The radiofrequency ablation catheter of claim 5 wherein the first and second segments are both straight segments and the third segment is an arc segment.

25. The radiofrequency ablation catheter of claim 5, wherein the holder has first grooves on both sides thereof, and the distal end of the pull wire has a latch embedded in the first grooves for fixedly connecting the pull wire to the holder.

26. The rf ablation catheter of claim 5, wherein the holder is an electro-ceramic material.

27. The rf ablation catheter of claim 5, wherein the retaining ring is in interference fit with the anchor block to limit the extension of the claw electrode.

28. The radiofrequency ablation catheter of claim 5, wherein the retaining ring is a silicone rubber material.

29. The rf ablation catheter of claim 28, wherein the retaining ring is a hollow cylinder and the retaining ring is split.

30. The radiofrequency ablation catheter of claim 5, wherein the retaining ring has cushions at both ends.

31. The rf ablation catheter of claim 30, wherein the cushion is made of a resilient rubber material.

32. The rf ablation catheter of claim 5, wherein the holder comprises: female fixed ring and the public fixed ring of concatenation each other.

33. The rf ablation catheter of claim 32, wherein the female fixation ring and the male fixation ring are hinged by a hinge shaft.

34. A radio frequency ablation system comprising a radio frequency ablation catheter as claimed in claims 5 to 33.