Disclosure of Invention
The invention provides a monopole adjustable ablation device, which solves the problems that in the background technology, the ablation area of the existing medical instrument is fixed singly and cannot be adjusted in a self-adaptive way according to the size of focal tissues, and simultaneously, when puncture is needed, the problem that blood vessels or normal tissues are punctured is avoided.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a needle core having a distal end and a proximal end, the distal end of the needle core being provided with a first ablation electrode;
a needle cannula having a distal end and a proximal end, the needle cannula having a second insulating layer disposed thereon, the distal end of the needle cannula being exposed to form a second ablation electrode;
The needle core is movably arranged in the needle tube in a penetrating way, the needle core is electrically connected with the needle tube, and the first ablation electrode can extend out of or be contained in the needle tube;
the needle core and the needle tube can synchronously move, and the needle core and the needle tube can relatively move;
the needle tube can move relative to the delivery sheath tube, and the distal end of the needle core and the distal end of the needle tube can be accommodated in or extend out of the delivery sheath tube;
The device further comprises a first push rod, a first sleeve and a second sleeve which are sequentially connected, wherein the first push rod, the first sleeve and the second sleeve are coaxially arranged;
the first push rod is provided with a first handle capable of moving in a reciprocating and linear mode, the first sleeve is provided with a first sliding block capable of moving in a reciprocating and linear mode, and the second sleeve is provided with a second handle capable of moving in a reciprocating and linear mode;
The proximal end of the conveying sheath tube is connected with the first grip, the proximal end of the needle tube is connected with the first sliding block, and the proximal end of the needle core is connected with the second grip;
The first lead is arranged at one end of the second handle, one end of the first lead is electrically connected with the needle core or the needle tube, and a first plug is arranged at the other end of the first lead.
In some embodiments, the distal end of the needle cannula is provided with a piercing tip, the distal end of the needle core is provided with a smooth guiding structure, or the distal end of the needle cannula is provided with a piercing tip.
In some embodiments, the needle comprises a needle body, a needle core and a needle tube, wherein the needle body is provided with a first handle and a first push rod, a part of the first push rod is inserted into the first handle, the first push rod can do reciprocating linear movement relative to the first handle, and the needle core and the needle tube are connected with the first push rod so as to enable the needle core and the needle tube to synchronously move.
In some embodiments, a delivery sheath is sleeved on the needle tube, one end of the delivery sheath is connected with the first grip, and the needle core and the needle tube can be accommodated in or extend out of the other end of the delivery sheath.
In some embodiments, a first limiting block capable of performing reciprocating linear movement is arranged on the first handle, the first limiting block can be fixed relative to the first handle, and one end of the first push rod can be abutted with the first limiting block.
In some embodiments, the handle further comprises a first threaded pipe rotatably arranged relative to the first handle, the first limiting block is provided with a first threaded hole in a matched mode, and the first limiting block is sleeved on the first threaded pipe through the first threaded hole.
In some embodiments, a first limiting structure is arranged between the first handle and the first limiting block, so that the first limiting block can do reciprocating linear movement along the axis direction of the first threaded pipe;
the first limit structure comprises a first limit groove arranged on the first handle and a first limit boss arranged on the first limit block, or a first limit boss arranged on the first handle and a first limit groove arranged on the first limit block, the first limit groove is matched with the first limit boss, and the first limit boss is clamped in the first limit groove.
In some embodiments, the handle further comprises a first knob rotatably arranged on the first handle, and the first knob is connected with the first threaded pipe so as to drive the first threaded pipe to rotate relative to the first handle.
In some embodiments, the first knob is provided with a first annular groove, the first grip is provided with a first annular boss, or the first knob is provided with a first annular boss, the first grip is provided with a first annular groove, the first annular groove is matched with the first annular boss, and the first annular boss is clamped in the first annular groove.
In some embodiments, a first support plate is provided on the first grip, a first support groove is provided on the first support plate, and a portion of the first threaded pipe is rotatably disposed in the first support groove.
In some embodiments, a first fixing slot is formed in the first grip, the first fixing slot is disposed near one end of the first threaded pipe, a first fixing clamping block is disposed on the first fixing slot, and one end of the delivery sheath pipe penetrates out of the first threaded pipe and is connected with the first fixing clamping block.
In some embodiments, the first push rod includes a first abutment section and a first limit section, the first abutment section is offset with respect to the first limit section, the first abutment section may abut against the first limit block, and the first limit section is used for limiting the first push rod to make a reciprocating linear movement.
In some embodiments, the first limiting section is provided with a first limiting plane and a second limiting groove, the first handle is provided with a first baffle, the first limiting section can be in butt joint with the first baffle, the first limiting plane is in butt joint with the first baffle, the first handle is provided with a second limiting boss and a first locking knob, the second limiting boss is clamped in the second limiting groove, and one end of the first locking knob can be in butt joint with the first limiting plane.
In some embodiments, the first stopper is provided with a needle insertion depth marking, the first handle is provided with a first scale marking, and the needle insertion depth marking can be aligned with the first scale marking.
In some embodiments, a needle seat is arranged in the first sleeve, one end of the needle tube is connected with the needle seat, a first connecting block is arranged on the needle seat, an adaptive first notch is arranged on the first sleeve, a preset length is arranged on the first notch, and the first connecting block penetrates out of the first notch to be connected with the first sliding block.
In some embodiments, a first limiting plate is arranged at the joint of the first push rod and the first sleeve, a second limiting plate is arranged at the joint of the first sleeve and the second sleeve, and the first sliding block can be abutted with the first limiting plate or the second limiting plate.
In some embodiments, a second scale mark line is arranged on the first sleeve, a second locking knob is arranged on the first sliding block, the edge line of the first sliding block can be aligned with the second scale mark line, and one end of the second locking knob can be abutted with the first sleeve.
In some embodiments, the second sleeve is provided with a third scale mark, the second handle is provided with a third locking knob, the edge of the second handle can be aligned with the third scale mark, one end of the third locking knob can be abutted with the first sleeve, and the second handle can be abutted with the second limiting plate.
In some embodiments, the second handle further comprises a first wire disposed at one end of the second handle, one end of the first wire is connected with the needle core, and a first plug is disposed at the other end of the first wire.
In some embodiments, the present invention also provides a method of operating a monopolar adjustable ablation device comprising the steps of:
S1, confirming the needle inserting depth, rotating a first knob, driving a first limiting block to a preset position, setting the needle inserting depth, pushing a first push rod, driving a needle core and a needle tube to synchronously move until the first push rod is abutted with the first limiting block, enabling the needle core and the needle tube to synchronously extend out of a conveying sheath tube, and fixing the position of the first push rod;
s2, according to the size and shape of the focus and the primary needle-inserting position, moving the first sliding block to adjust the position of the needle tube or moving the second handle to adjust the position of the needle core, enabling the needle core to extend out of a certain length relative to the needle tube, and fixing the relative position of the needle core and the needle tube;
And S3, switching on a power supply to perform discharging operation.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the needle tube and the needle core are arranged, the needle core is movably penetrated in the needle tube, the second ablation electrode is arranged on the needle tube, the first ablation electrode is arranged on the needle core, and the puncture tip arranged on the needle tube and the smooth guide structure arranged on the needle core are combined, so that the puncture condition can be met, the damage of the puncture tip to normal tissues or blood vessels of a human body in the puncture process can be avoided, and the operation difficulty of a doctor is reduced. In addition, through setting up the first ablation electrode on the nook closing member and the second ablation electrode electricity on the needle tubing and being connected, realize the transmission of ablation energy, can make the second ablation electrode enlarge discharge range with the help of the first ablation electrode that sets up on the nook closing member to increase the ablation area, in order to satisfy the ablation demand of different size focus.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Detailed Description
The present application will be described in further detail with reference to the accompanying drawings. In the description of the present embodiment, unless otherwise indicated, the terms "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the present application must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
As shown in fig. 1-2, a monopole adjustable ablation device according to the present invention mainly includes a needle tube 600 and a needle core 700. Specifically, the needle cannula 600 has a distal end and a proximal end, and a second insulating layer 602 is provided on the needle cannula 600, the distal end of the needle cannula 600 being exposed to form a second ablation electrode 601 for releasing ablation energy, the distal end of the needle cannula 600 being on the left as viewed in fig. 2. In this embodiment, in order to conform to the ablation of focal tissue with a smaller size, the exposed length of the needle tube 600 is relatively smaller, and in this embodiment, the second ablation electrode 601 and the second insulation layer 602 are integrated by means of hot melt cladding or adhesive, etc. of the second ablation electrode 601 and the second insulation layer 602, so that the rigidity and toughness of the needle tube 600 are increased and the pushing capability of the needle tube 600 is improved.
The needle core 700 is provided with a distal end and a proximal end, wherein the proximal end is a connecting end, the distal end is a discharging end, the needle core 700 is movably arranged in the needle tube 600 in a penetrating way, the distal end of the needle core 700 is provided with a first ablation electrode 701, and the first ablation electrode 701 can be accommodated in or extend out of the needle tube 600. In this embodiment, the ablation device has a monopolar ablation structure, and the contact between the needle core 700 and the needle tube 600 is electrically connected, so that ablation energy is transferred, and the external energy generator can be connected with the needle tube 600 or the needle core 700.
It should be noted that, the needle core 700 and the needle tube 600 may move synchronously, and the needle core 700 and the needle tube 600 may move relatively, for example, the needle tube 600 may move alone or the needle core 700 may move alone during actual operation, wherein, as shown in fig. 2, the puncture tip 6011 is disposed at the distal end of the needle tube 600, the smooth guiding structure 7011 is disposed at the distal end of the needle tube 700, or, as shown in fig. 3 and 5, the smooth guiding structure 7011 is disposed at the distal end of the needle tube 600, and the puncture tip 6011 is disposed at the distal end of the needle tube 700. In this embodiment, the puncture tip 6011 has a cutting edge to improve the puncture strength, and the smooth guiding structure 7011 is a rounded structure or a combination structure of a bevel and a rounded corner. Further, since the needle tube 600 moves in the human body cavity, as shown in fig. 4, a plurality of evenly spaced separation grooves 6012 are formed on the surface of the needle tube 600 to ensure flexibility thereof, and the needle tube 600 can be bent in the complete cavity of the human body, and can provide supporting force when the needle tube 600 is penetrated by the needle by arranging the needle core 700, so that the rigidity of the needle tube 600 is improved to facilitate penetration.
Through adopting above-mentioned integrated configuration, on the one hand through setting up puncture pointed end 6011, satisfy and melt the puncture demand, simultaneously, set up smooth guide structure 7011, when carrying out the ablation device transmission to focus department, can avoid human normal tissue to puncture by puncture pointed end 6011 and cause the damage through smooth guide structure 7011, especially when carrying the in-process, when blood vessel is comparatively intensive, can be with the vascular roof-open through smooth guide structure 7011 on the needle core 700 to avoid the blood vessel to be punctured, cause unnecessary damage, reduce doctor's operation degree of difficulty. On the other hand, by movably penetrating the needle core 700 into the needle tube 600, since the needle core 700 is electrically connected with the needle tube 600, when the needle core 700 penetrates out of the needle tube 600, the length of the needle core 700 penetrating out of the needle tube 600 is the length of the first ablation electrode 701, so that the effective ablation length of the second ablation electrode 601 can be enlarged by means of the relative length of the needle core 700 penetrating out of the needle tube 600, the ablation area is further improved, and the ablation requirement of larger focus tissues is met.
In one embodiment, as shown in fig. 6, to realize the synchronous movement of the needle core 700 and the needle tube 600, the device further comprises a first grip 200 and a first push rod 100, wherein a part of the first push rod 100 is inserted into the first grip 200, and the first push rod 100 can reciprocate linearly relative to the first grip 200.
Further, a delivery sheath 500 is provided on the needle cannula 600 to facilitate delivery of the needle cannula 600, the delivery sheath 500 has a distal end and a proximal end, the proximal end of the delivery sheath 500 is fixedly connected to the first grip 200, in an initial state, both the needle cannula 600 and the needle core 700 are accommodated in the delivery sheath 500, and when reaching a target position, the needle cannula 600 and the needle core 700 are pushed out of the other end of the delivery sheath 500 by pushing the first push rod 100 to perform lesion tissue penetration. In this embodiment, the delivery sheath 500 is an insulating tube, for example, made of PTFE/PEBAX/PTFE, PI, or the like.
In one embodiment, as shown in fig. 12 and 13, the end of the first push rod 100 located outside the first grip 200 is further provided with a first sleeve 300 and a second sleeve 400, one end of the first sleeve 300 is connected with the first limiting section 101 of the first push rod 100, and one end of the second sleeve 400 is connected with the other end of the first sleeve 300, wherein, it should be noted that the first abutting section 102 of the first push rod 100, the first sleeve 300 and the second sleeve 400 are coaxially arranged;
The first slide block 301 is arranged on the first sleeve 300, the first slide block 301 can do reciprocating linear movement along the axial direction of the first sleeve 300, one end of the needle tube 600 is connected with the first slide block 301, the second sleeve 400 is provided with a second handle 401, the second handle 401 can do reciprocating linear movement along the axial direction of the second sleeve 400, and one end of the needle core 700 is connected with the second handle 401. In this embodiment, the second grip 401 is divided into two detachably connected two shells, a first clamping groove 4012 is provided at one end of the second grip 401, a first clamping ring 40121 is provided in the first clamping groove 4012, a clamping boss with a guiding surface structure is provided on the first clamping ring 40121, and the clamping boss can be clamped in the first clamping groove 4012, thereby fixing the two shells.
By adopting the above structure, the synchronous movement of the needle tube 600 and the needle core 700 is controlled, and the independent movement of the needle tube 600 and the needle core 700 is also realized.
Further, in order to accurately control the needle insertion depth, a first limiting block 203 capable of moving linearly in a reciprocating manner is arranged on the first handle 200, the first limiting block 203 can be fixed in position relative to the first handle 200, one end of the first push rod 100 located in the first handle 200 can be abutted against the first limiting block 203, and the accurate regulation and control of the puncture depth can be performed before an operation by arranging the first limiting block 203, so that excessive puncture or insufficient puncture can be avoided, and the expected ablation effect can not be achieved.
In one embodiment, in order to facilitate the first limiting block 203 to make a reciprocating rectilinear movement on the first grip 200, the device further comprises a first threaded pipe 202 rotatably disposed on the first grip 200, an external thread is disposed on the first threaded pipe 202, a threaded hole adapted to the first limiting block is disposed on the first limiting block 203, the first limiting block 203 is sleeved on the first threaded pipe 202 through a threaded fit, and further, a first limiting structure is disposed between the first grip 200 and the first limiting block 203, and the first limiting structure is used for making the first limiting block 203 make a reciprocating rectilinear movement.
Specifically, as shown in fig. 8, the first limiting structure includes a first limiting boss disposed on the first limiting block 203 and a first limiting groove 204 disposed on an inner wall of the first grip 200, where the first limiting groove 204 is disposed with a certain length, so as to meet a needle insertion requirement of the needle tube 600, the first limiting boss is slidably clamped in the first limiting groove 204, and a length direction of the first limiting groove 204 is consistent with an axial direction of the first threaded tube 202, and by rotating the first threaded tube 202, under the action of the first limiting structure, the first limiting block 203 is made to reciprocate on the first threaded tube 202.
Alternatively, as another modification of the present embodiment, the first limiting groove 204 may be disposed on the first limiting block 203, and the first limiting boss may be disposed on the inner wall of the first grip 200, which may also achieve the above objective.
Alternatively, the first threaded pipe 202 may be a cylindrical sleeve, the first limiting block 203 is movably sleeved on the cylindrical sleeve, a notch with a certain length is provided on the first handle 200, and a part of the first limiting block 203 extends out of the first handle 200 through the notch to form a pushing structure, so that the reciprocating linear movement of the first limiting block 203 may also be realized.
In one embodiment, to facilitate controlling the first limiting block 203, a first knob 201 is disposed at an end of the first grip 200 near the delivery sheath 500, the first knob 201 is connected to the first threaded tube 202, and the first knob 201 is rotatably disposed relative to the first grip 200, and by rotating the first knob 201, the first threaded tube 202 is driven to rotate, so as to realize the reciprocating movement of the first limiting block 203. In this embodiment, in order to facilitate assembly, the first knob 201 and the first threaded tube 202 are detachably disposed, as shown in fig. 6 and 8, and are fixed by threaded connection, optionally, the first knob 201 and the first threaded tube 202 may be fixed by a clamping manner, or alternatively, the first knob 201 and the first threaded tube 202 may be integrally disposed. Meanwhile, since the first grip 200 is provided as two detachably connected housings, the structure of the first grip 200 formed by the two housings can be further reinforced by providing the first knob 201.
Specifically, as shown in fig. 6, 8 and 17, a first annular groove 2012 is provided on the first knob 201, a first annular boss 211 is provided on the first grip 200, the first annular boss 211 is adapted to the first annular groove 2012, the first annular boss 211 is clamped in the first annular groove 2012, and a plane formed by the contour of the first annular boss 211 is perpendicular to the axial direction of the first threaded tube 202. Alternatively, the first annular boss 211 may be disposed on the first knob 201, and the first annular groove may be disposed on the first grip 200, so that the first knob 201 may be rotatably disposed with respect to the first grip 200.
Further, a first connecting thread 2011 is provided on the first knob 201, the first connecting thread 2011 is connected with an external instrument, in this embodiment, the external instrument is an endoscope, and the first connecting thread 2011 is movably connected with a forceps opening of the endoscope, the connection effect is the same as the luer connector connection effect, and the luer connector is the prior art and is not described in detail herein.
In one embodiment, to support the first threaded tube 202, a first support plate 212 is disposed inside the first grip 200, and as shown in fig. 8 and 9, a first support groove is disposed on the first support plate 212, and the first support groove is adapted to a part of the first threaded tube 202, and a part of the first threaded tube 202 is rotatably disposed in the first support groove.
In one embodiment, to facilitate the fixing of the delivery sheath 500, a first fixing clip groove 208 is provided in the first grip 200, a first fixing clip 207 is provided in the first fixing clip groove 208, the first fixing clip groove 208 is provided near one end of the first threaded tube 202, and one end of the delivery sheath 500 penetrates the first threaded tube 202 to be fixedly connected with the first fixing clip 207, so that the fixing connection of the delivery sheath 500 relative to the first grip 200 is realized. By providing this structure, the delivery sheath 500 is passed through the primary threaded tube 202, thereby further reinforcing the support structure of the primary threaded tube 202.
In one embodiment, as shown in fig. 11, since the first threaded pipe 202 needs to occupy a certain space, and the first limiting block 203 is sleeved on the first threaded pipe 202, in order to facilitate the abutting of the first push rod 100 and the first limiting block 203, and no motion interference occurs between the first push rod 100 and the first threaded pipe 202, the first push rod 100 is configured as a first abutting section 102 and a first limiting section 101, the first abutting section 102 is offset relative to the first limiting section 101, the first abutting section 102 is used for abutting the first limiting block 203, and the first limiting section 101 is used for the first push rod 100 to make a reciprocating linear movement along the axis direction thereof.
Specifically, as shown in fig. 13, in order to ensure stability of the abutting structure, the first abutting section 102 is an arc plate structure with a continuous structure, the arc range of the arc plate is not greater than 180 degrees, a certain gap is reserved between the first abutting section 102 and the first supporting plate 212, so that the first abutting section 102 can smoothly push to abut against the first limiting block 203, the length of the first abutting section 102 with the arc plate structure can cover the thread length of the first threaded tube 202, so that the maximum needle penetration depth of the needle tube 600 can be achieved, and by setting the first abutting section 102 with the arc plate structure, movement interference between the first abutting section 102 and the first threaded tube 202 can be avoided, and the abutting strength between the first push rod 100 and the first limiting block 203 can be further reinforced.
In order to ensure that the first push rod only moves linearly, as shown in fig. 10 and 11, a second limiting groove 1011 is formed on the first limiting section 101, a second limiting boss 206 is formed on the first grip 200, the length direction of the second limiting boss 206 is consistent with the axial direction of the first push rod 100, the second limiting boss 206 is clamped in the second limiting groove 1011, on this basis, a first limiting plane is also formed on the first limiting section 101, as shown in fig. 7 and 12, a first baffle 205 is formed on the first grip 200, the first baffle 205 abuts against the first limiting plane, and further limits the first push rod 100 in the vertical direction, so that the first push rod 100 is prevented from swinging up and down, and the vertical direction is the up and down direction in the direction shown in fig. 6. In the initial position, as shown in fig. 7, the first abutment section 102 of the first push rod 100 abuts against the first shutter 205, and at this time, the needle insertion depth is 0. Further, a first locking knob 210 is disposed on the first grip 200, the first locking knob 210 is disposed on the first grip 200 by threaded engagement, one end of the first locking knob 210 may abut against the first limiting plane, when the first locking knob 210 abuts against the first limiting plane, the first push rod 100 is fixed in position, and when the first locking knob 210 is separated from the first limiting plane, the first push rod 100 may move.
Alternatively, the second limiting boss 206 may be disposed on the first limiting section 101 of the first push rod 100, and the second limiting groove 1011 may be disposed on the inner wall of the first grip 200, so as to achieve the above effect.
Similarly, in order to realize the reciprocating linear movement of the second grip 401 relative to the second sleeve 400, a fourth limit groove 403 is arranged on the second sleeve 400, a fourth limit boss 4014 is arranged on the second grip 401, the fourth limit boss 4014 is clamped in the fourth limit groove 403, and the fourth limit groove 403 is provided with a preset length to meet the requirement that the second grip 401 moves in a reciprocating linear manner relative to the second sleeve 400.
Further, as shown in fig. 8 and 9, in order to fix the first threaded pipe 202, a circular fixing disc 2021 may be disposed at one end of the first threaded pipe 202, the circular fixing disc 2021 and the first threaded pipe 202 are coaxially disposed, an annular supporting surface is disposed on the first abutting section 102, the inner diameter of the annular supporting surface is the same as the outer diameter of the circular fixing disc 2021, and in the initial state, the circular fixing disc 2021 abuts against the annular supporting surface, and it is particularly pointed that the outer diameter of the circular fixing disc 2021 is larger than the outer diameter of the threaded section of the first threaded pipe 202, so that a gap is provided between the first threaded pipe 202 and the annular supporting surface, so that the first abutting section 102 is smoothly pushed to abut against the first limiting block 203.
Further, in order to accurately insert the needle, a first scale mark 209 is provided on the first grip 200, and an insert depth mark is provided on the first stopper 203, and in the initial position, the insert depth mark is aligned with the 0 scale mark of the first scale mark 209. The needle penetration depth gauge is aligned with a numerical gauge of the first scale gauge 209, i.e., is representative of the needle penetration depth of the syringe.
Further, as shown in fig. 13, a needle holder 303 is provided in the first cannula 300, and the outer shape of the needle holder 303 is adapted to the inner structure of the first cannula 300 such that the needle holder 303 can be linearly moved inside the first cannula 300, and one end of the needle cannula 600 is connected to the needle holder 303. A first connection block 3031 is provided on the needle holder 303, the first connection block 3031 protrudes with respect to the needle holder 303, a first notch 302 is provided on a side edge of the first sleeve 300, and the first notch 302 is provided with a preset length, thereby satisfying the adjustment of the moving distance of the needle tube 600. The first connection block 3031 extends out of the first notch 302 to be connected with the first slider 301, in this embodiment, a first connection groove 3011 adapted to the first connection block 3031 is provided on the first slider 301, and a portion of the first connection block 3031 is clamped in the first connection groove 3011, and is fixed by glue bonding, clamping and other manners. In this embodiment, the number of the first slots 302 is two, and the number of the first connection blocks 3031 is two, and it can be appreciated that the number of the first slots 302 and the first connection blocks 3031 is not limited by the present invention, and only the first slider 301 and the needle holder 303 need to be connected.
In one embodiment, to limit the first slider 301, a first limiting plate 304 is disposed at a connection portion between the first sleeve 300 and the first push rod 100, and a second limiting plate 402 is disposed at a connection portion between the first sleeve 300 and the second sleeve 400, where the first slider 301 can abut against the first limiting plate 304 or the second limiting plate 402, so as to avoid over-travel movement of the first slider 301.
In this embodiment, for convenience in assembly, the first sleeve 300 and the first push rod 100 are integrally formed, the first limiting plate 304 is disposed on the first sleeve 300, the second sleeve 400 is detachably connected with the first sleeve 300, in this embodiment, the second limiting plate 402 is disposed on the second sleeve 400 by screw-thread fit and fixed, so that a threaded hole is formed at the second limiting plate 402 conveniently, and an adapted external thread is disposed at the other end of the first sleeve 300.
Alternatively, the first sleeve 300 and the second sleeve 400 may also be connected in a snap-fit manner. A separate structure may be provided between the first push rod 100 and the first sleeve 300, in correspondence with the connection structure of the first sleeve 300 and the second sleeve 400.
Further, in order to accurately control the movement distance of the needle tube 600, as shown in fig. 12, a second scale mark 306 is provided on the first sleeve 300, the edge of the first slider 301 may be aligned with the second scale mark 306, and the number of the alignment between the edge of the first slider 301 and the second scale mark 306 is the movement distance of the needle tube 600 in this embodiment. In order to fix the relative position of the needle tube 600 conveniently, a second locking knob 305 is disposed on the first slider 301, the second locking knob 305 is disposed on the first slider 301 through threaded engagement, one end of the second locking knob 305 can be abutted against or separated from the first sleeve 300, in this embodiment, a planar structure is disposed on the first sleeve 300, so that the second locking knob 305 is abutted against and fixed.
In one embodiment, as shown in fig. 14, a third scale mark 404 is disposed on the second sleeve 400, the edge of the second grip 401 may be aligned with the third scale mark 404, and a third locking knob 4013 is disposed on the second grip 401, where the third scale mark 404 and the third locking knob 4013 are the same as the foregoing principles, and will not be repeated herein. The second grip 401 can abut against the second limiting plate 402, so that the second limiting plate 402 can limit the second grip 401. In this embodiment, a clamping groove is formed on the second grip 401, a first clamping seat 4015 is formed on the clamping groove, the first clamping seat 4015 is detachably arranged in the clamping groove, and one end of the needle core 700 is connected with the first clamping seat 4015, so that the second grip 401 drives the needle core 700 to move.
Further, as shown in fig. 14 and 15, the ablation device further includes a first wire 4011, the first wire 4011 may also be fixedly connected to the first card seat 4015, and the first wire 4011 is electrically connected to the needle core 700, so as to realize that the ablation energy of the external energy generator is transferred to the first ablation electrode 701 through the needle core 700. In order to facilitate the plugging with an external energy generator, a first plug 40111 is provided at one end of the first wire 4011, and the first plug 40111 is plugged to conduct with the external energy generator.
Alternatively, first wire 4011 may be electrically connected to needle cannula 600, as well as achieve the above.
Further, as shown in fig. 15 and 16, a third limiting groove 405 is provided on the first sleeve 300, an adapted third limiting boss 4016 is provided on the inner wall of the second grip 401, and the third limiting boss 4016 can be clamped in the third limiting groove 405, so as to realize limiting between the second grip 401 and the first sleeve 300. By providing the third limit groove 405 and the third limit boss 4016, the second grip 401 can be prevented from moving over the second sleeve 400.
In one embodiment, the present invention further provides a method of operating a monopolar adjustable ablation device, applied to one of the above embodiments, comprising the steps of:
S1, confirming the needle insertion depth, as shown in FIG. 2, the needle core 700 and the needle tube 600 synchronously move and extend out of the delivery sheath 500 to a preset position, and the specific process is as follows:
As shown in fig. 6, the first knob 201 is turned to drive the first threaded tube 202 to rotate, at this time, under the action of the first threaded tube 202, the first limiting block 203 is linearly moved, when moving to a preset position, the first locking knob 210 is unlocked at this time, the first push rod 100 is pushed, the first push rod 100 is linearly moved relative to the first grip 200, the needle tube 600 and the needle core 700 are driven to synchronously move and extend out of the delivery sheath 500, as shown in fig. 18, namely, the moving direction of A1, and when the first abutting section 102 of the first push rod 100 abuts against the first limiting block 203, the first knob 201 is locked at this time, so that the adjustment of the needle penetration depth is completed.
S2, according to the size and shape of the focus and the initial needle insertion position, the relative length of the needle core 700 extending out of the needle tube 600 is adjusted, and the relative position is fixed, and the specific process is as follows:
When the needle tube 600 is only moved backward, i.e. in the right direction as shown in fig. 12 and 15, the second locking knob 305 is unlocked, the first slider 301 is moved backward, the needle tube 600 is driven to move backward, the needle core 700 leaks out relative to the needle tube 600 at this time, the relative length of the needle core 700 extending out of the needle tube 600 is adjusted according to the size of the lesion tissue, so as to ensure that the pulse electric field can cover the lesion tissue, and when the required discharge length is adjusted, the second locking knob 305 is locked at this time. In this embodiment, the distal end portion of the needle core 700 is a bare metal structure, which forms the first ablation electrode 701, and the needle core 700 is electrically connected to the needle tube 600 in contact, and the length of the needle core 700 extending from the needle tube 600 is the effective ablation length increased by the second ablation electrode 601.
It is also possible to simply advance the needle core 700, i.e., in the left direction as shown in fig. 15, unlock the third locking knob 4013, move the second handle 401 to the left in the direction shown in fig. 15, drive the needle core 700 to extend out of the needle tube 600 and adjust to a desired discharge length, and then lock the third locking knob 4013.
If the focal tissue is very large, both the needle core 700 and the needle cannula 600 can be moved and adjusted. The above steps of adjusting the movement of the core 700 and the needle 600 are repeated.
After the above operation is completed, the second ablation electrode 601 and the first ablation electrode 701 are both positioned in the focal tissue, and the positions of the two electrodes are fixed relative to the focal tissue, and at this time, a discharging operation is performed. In this example, the focal tissue is a tumor.
It should be noted that, when the needle tube has the puncture tip 6011, during the puncture process, when hitting a blood vessel, the needle core 700 is extended, and since the head end of the needle core 700 has the round smooth guiding structure 7011, the blood vessel can be ejected, and after the blood vessel is ejected, the needle tube 600 is pushed to continue to puncture along the path of the needle core 700. When the distal end of the needle tube 600 is a round smooth guiding structure 7011, blood vessels are not damaged directly during needle insertion, when the tumor position is reached, a softer tumor can directly pass through due to different hardness of the tumor, when the softer tumor is encountered, the needle core 700 can be extended, and after the puncture tip 6011 arranged on the needle core 700 punctures the tumor, the needle tube 600 is pushed to advance along the path of the needle core 700.
The foregoing is merely a preferred embodiment of the invention, and it should be noted that modifications and enhancements can be made by those skilled in the art without departing from the principles of the present invention. Such modifications and variations are also considered to be a departure from the scope of the invention.