Multifunctional puncture positioning and fixing device for liver tissue radiofrequency ablation

Abstract

The application discloses a multifunctional puncture positioning and fixing device for liver tissue radiofrequency ablation, and relates to the technical field of medical devices.The device comprises a belt, a positioning assembly for fixing effect, and a puncture assembly for puncture action.The two sides of the belt are provided with side belts, and the top end of the belt is provided with an abdominal belt.The two ends of the belt and the abdominal belt are both provided with elastic ropes, and the two elastic ropes are both provided with the side belts at corresponding positions.The surface of the abdominal belt is provided with a window.The application effectively reduces the respiratory displacement of liver tissue by setting a winding mechanism, supports independent and fine adjustment of the puncture point and the puncture angle by setting a distance adjusting mechanism, accurately controls the puncture depth of the needle tip by setting the puncture assembly, and realizes flexible mechanical interlocking between the needle body and the liver tissue after reaching the target position, further limits the respiratory displacement amplitude of the liver tissue, and thus guarantees the complete form of the ablation zone.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a multifunctional puncture positioning and fixation device for radiofrequency ablation of liver tissue. Background Technology

[0002] Radiofrequency ablation of liver tissue is a minimally invasive interventional treatment technique. It involves precisely inserting a radiofrequency puncture needle into the liver tumor and using high-frequency current to generate high temperatures, causing coagulative necrosis of the tumor tissue, thereby achieving local tumor inactivation. During this procedure, the liver is prone to displacement due to respiratory movements, and the tumor is located deep within the body with complex surrounding blood vessels and bile ducts, requiring extremely high puncture precision. Therefore, a puncture positioning and fixation device is essential to ensure the needle path perfectly matches the preoperative plan. A search revealed Chinese patent CN121015308A, which includes a handle with a depth adjustment block at the top, a trigger on one side of the handle, an extension rod at the top of the trigger, an adjustable bend fixedly connected to one side of the extension rod, and a cutting electrode mounted on one side of the adjustable bend. The above-mentioned scheme, through the design of an adjustable bendable tube and a snake-bone cutting structure, allows the instrument tip to bend flexibly at multiple angles, significantly expanding the surgical operating range. It is especially suitable for areas that are difficult to directly access, such as the back of the liver, reducing reliance on other auxiliary instruments and improving the flexibility and operability of the surgery. The depth limiting head is linked to the trigger, and with the seven-level design of the depth adjustment block, the depth of the cutting electrode inserted into the liver can be precisely controlled, avoiding over-puncture or insufficient ablation, thus improving the safety and effectiveness of the surgery.

[0003] However, during puncture and ablation, the patient's breathing causes displacement of the liver tissue due to the contraction and relaxation of the diaphragm. At this time, the liver will move up and down as a whole with the dome-shaped movement of the diaphragm. Under calm breathing, the displacement in the head-to-feet direction can reach 1-2 cm. The above-mentioned method does not take into account the impact of liver displacement deviation on the operation, and thus it is difficult to avoid the risks of target drift and ablation zone deformation. In addition, the above-mentioned method lacks the effect of fixing the puncture point, and relying on manual holding poses a risk of needle tract deviation. Summary of the Invention

[0004] The purpose of this invention is to provide a multifunctional puncture positioning and fixation device for radiofrequency ablation of liver tissue, which has the advantages of positioning puncture and displacement restriction, and solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multifunctional puncture positioning and fixation device for radiofrequency ablation of liver tissue, comprising a shoulder strap, a positioning component for achieving fixation, and a puncture component for achieving insertion. Side straps are provided on both sides of the shoulder strap, and an abdominal band is provided at the top of the shoulder strap. Elastic cords are threaded through both ends of the shoulder strap and the abdominal band, and each elastic cord passes through a corresponding side strap. A window is provided on the surface of the abdominal band. The positioning component includes a winding mechanism for controlling the degree of restraint and an adjusting mechanism for achieving rigidity and stability. The winding mechanism includes a base plate disposed within the shoulder strap, and the adjusting mechanism includes a fixed platform fixedly connected to the upper surface of the abdominal belt.

[0006] Preferably, a fixing pin is fixedly connected to the top of the base plate, a ratchet is fixedly connected to the outer contour of the middle section of the fixing pin, a cover plate is limited and connected to the top of the fixing pin through a spline engagement, a gear ring is meshed and driven on the outer contour of the ratchet, and spur gears are meshed and driven on the outer contours of both sides of the gear ring, and a positioning pin is penetrated through the center of each spur gear.

[0007] Preferably, the base plate is movably connected to the shoulder strap, the cover plate is fixedly connected to the center of the shoulder strap, the positioning pin is fixedly connected to the shoulder strap through it, and the elastic cords are all wound around the middle section of the corresponding spur gear.

[0008] Preferably, a reciprocating lead screw is passed through the middle section of the fixed platform, one end of the reciprocating lead screw extends out of the fixed platform and is fixedly connected to a knob, and a threaded ring is engaged with the outer contour of the middle section of the reciprocating lead screw, and a bracket is fixedly connected to the top of the threaded ring.

[0009] Preferably, the adjusting mechanism further includes a fixing ring fixedly connected to the bottom of the bracket at the end away from the threaded ring. A side plate is fixedly connected to one side of the fixing ring, and a compression spring is fixedly connected to the surface of the side plate pointing towards the fixing ring. A bevel gear is fixedly connected to the end of the compression spring away from the side plate.

[0010] Preferably, a second side plate is fixedly connected to the other side of the fixed ring, and the second bevel gear is meshed and driven at the end of the first bevel gear away from the compression spring. The second bevel gear is fixedly connected to the second side plate, and a connecting shaft is fixedly connected at the end of the first bevel gear away from the compression spring. The connecting shaft passes through the second bevel gear and the second side plate in sequence and extends out of the outside of the fixed ring. An adjusting ring is fixedly connected at the end of the connecting shaft away from the second bevel gear.

[0011] Preferably, the puncture assembly includes a fixed seat fixedly connected to the outer surface of the end of the adjusting ring away from the connecting shaft, a fixed cylinder fixedly connected to the end of the fixed seat away from the adjusting ring, a threaded portion provided on the outer contour of the top end of the fixed cylinder, and a threaded sleeve screwed to the top end of the fixed cylinder through the threaded portion.

[0012] Preferably, a puncture needle is inserted through the interior of the fixed cylinder, a push plate is fixedly connected to the top of the puncture needle, a needle tip is provided at the bottom of the puncture needle, an injection tube is inserted through the interior of the puncture needle, the top of the injection tube passes through the push plate and extends out of the outside of the push plate, and a capsule is fixedly connected to the bottom of the puncture needle near the needle tip, and the capsule is in communication with the injection tube.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention, by setting up a winding mechanism that wraps around the patient's chest and abdomen, applies pressure to the patient's chest and abdomen to limit the range of motion of the diaphragm during breathing, thereby effectively reducing the respiratory displacement of liver tissue and effectively compressing the dynamic range of motion of the target area, thus expanding the safe time window for puncture and ablation.

[0014] 2. This invention, by setting up an adjustment mechanism and adopting a multi-degree-of-freedom mechanical structure, supports independent and precise adjustment of the puncture point and puncture angle; and after the adjustment is completed, the joint of the adjustment mechanism is locked, providing a stable support platform for the puncture component, thereby fundamentally eliminating the initial deviation caused by the doctor's hand tremor or the patient's slight movement, and ensuring that the puncture trajectory is completely consistent with the virtual planned path.

[0015] 3. By setting up a puncture component, the doctor can precisely control the insertion depth of the needle tip through external adjustments of the component. After reaching the target position, physiological saline is injected to allow the capsule to safely expand within the liver parenchyma, achieving a flexible mechanical interlock between the needle body and the liver tissue. This further restricts the respiratory displacement of the liver tissue, thereby ensuring the integrity of the ablation zone. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a cross-sectional view of the main structure of the present invention; Figure 3 This is a schematic diagram of the binding steel strap of the present invention; Figure 4 This is a schematic diagram of the winding mechanism of the present invention; Figure 5 This is a schematic diagram of the positioning component of the present invention; Figure 6 This is a schematic diagram of the adjusting mechanism of the present invention; Figure 7 This is a schematic diagram of the adjusting mechanism of the present invention; Figure 8 This is a partial schematic diagram of the puncture component of the present invention; Figure 9 This is a schematic diagram of the puncture component of the present invention.

[0017] In the diagram: 1. Carrying strap; 11. Side straps; 12. Abdominal strap; 13. Elastic cord; 14. Window; 2. Base plate; 21. Fixing pin; 22. Ratchet; 23. Cover plate; 24. Gear ring; 25. Spur gear; 26. Positioning pin; 3. Fixing platform; 31. Reciprocating screw; 32. Knob; 33. Threaded ring; 34. Bracket; 4. Fixing ring; 41. Side plate one; 42. Compression spring; 43. Bevel gear one; 44. Side plate two; 45. Bevel gear two; 46. Connecting shaft; 47. Adjusting ring; 5. Fixing seat; 51. Fixing cylinder; 52. Threaded part; 53. Threaded sleeve; 6. Puncture needle; 61. Push plate; 62. Needle tip; 63. Injection tube; 64. Bag. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1:

[0020] Please see Figures 1 to 9 This invention provides a technical solution: a multifunctional puncture positioning and fixation device for radiofrequency ablation of liver tissue, including a shoulder strap 1, a positioning component for achieving fixation, and a puncture component for achieving insertion. Side straps 11 are provided on both sides of the shoulder strap 1, and an abdominal band 12 is provided at the top of the shoulder strap 1. Elastic ropes 13 are threaded through both ends of the shoulder strap 1 and the abdominal band 12, with each elastic rope 13 passing through a corresponding side strap 11. A window 14 is provided on the surface of the abdominal band 12.

[0021] The positioning component includes a winding mechanism for controlling the degree of restraint and an adjusting mechanism for achieving rigidity and stability. The winding mechanism includes a base plate 2 disposed within the shoulder strap 1, and the adjusting mechanism includes a fixed platform 3 fixedly connected to the upper surface of the abdominal belt 12.

[0022] In this scheme, a restraint steel belt structure is formed by the back strap 1, side straps 11, abdominal strap 12 and elastic rope 13. The patient wears it on the chest and abdomen, and the tightness of the restraint steel belt is controlled by the winding mechanism, thereby compressing the patient's chest and abdomen, gently restricting the range of diaphragmatic movement in a non-invasive manner, thereby reducing the respiratory displacement of liver tissue and compressing the dynamic range of movement of the target area.

[0023] The tightness of the restraint strap is controlled by real-time respiratory monitoring data from preoperative imaging. During the preoperative planning process, the doctor performs three-dimensional reconstruction on the imaging workstation to virtually plan the optimal puncture path, needle entry point, and ablation range. After determining the needle entry point, it is projected and marked on the patient's skin surface. The doctor then puts the restraint strap on the patient's chest and abdomen, ensuring that the preset needle entry point on the patient's skin surface can be observed through window 14. After anesthesia, the puncture procedure is performed.

[0024] Example 2:

[0025] Please see Figure 3 and Figure 4 This embodiment further illustrates the following based on Embodiment 1: A fixing pin 21 is fixedly connected to the top of the base plate 2. A ratchet 22 is fixedly connected to the outer contour of the middle section of the fixing pin 21. A cover plate 23 is limited and connected to the top of the fixing pin 21 through a spline engagement. A gear ring 24 is meshed and driven on the outer contour of the ratchet 22. Spur gears 25 are meshed and driven on the outer contours of both sides of the gear ring 24. A positioning pin 26 is penetrated through the center of each spur gear 25.

[0026] The base plate 2 is movably connected to the shoulder strap 1, the cover plate 23 is fixedly connected to the center of the shoulder strap 1, the positioning pin 26 is fixedly connected to the shoulder strap 1 through, and the elastic ropes 13 are all wound around the middle section of the corresponding spur gear 25.

[0027] When it is necessary to adjust the tightness of the binding steel belt, the base plate 2 is pulled out manually. At this time, the fixing pin 21 is pulled out synchronously with the base plate 2, and the spline engagement between the top of the fixing pin 21 and the cover plate 23 is released. At this time, the fixing pin 21 and the base plate 2 can rotate normally. Then, the base plate 2 is rotated manually, and the base plate 2 drives the fixing pin 21 and the ratchet 22 to rotate synchronously.

[0028] Furthermore, due to the meshing effect between the gear ring 24 and the ratchet 22, when the ratchet 22 rotates clockwise, the meshing surface between it and the gear ring 24 is smaller, and when the ratchet 22 rotates counterclockwise, the meshing surface between it and the gear ring 24 is larger. The gear ring 24 also meshes with the spur gear 25. When the gear ring 24 rotates along with the ratchet 22, the spur gear 25 rotates synchronously, thereby gradually winding up the elastic rope 13.

[0029] At the same time, the elastic cord 13 is rolled up, causing its effective length to shorten. At this time, the internal space of the restraint steel belt composed of the back strap 1, side strap 11, abdominal strap 12 and elastic cord 13 is reduced synchronously to compress the patient's chest and abdomen, thereby limiting the patient's breathing amplitude. By suppressing the movement amplitude of the diaphragm during the patient's breathing, the respiratory displacement of the liver tissue is reduced, thereby compressing the dynamic movement range of the target area and expanding the safe time window for puncture and ablation.

[0030] It should be noted that as the elastic cord 13 continues to be wound up, the pressure of the restraint steel belt on the patient's chest and abdomen gradually increases. When the pressure reaches the limit, due to the influence of the patient's body shape, the elastic cord 13 cannot be wound up further. At this time, because the meshing surface between the ratchet 22 and the toothed ring 24 is small when the ratchet 22 rotates clockwise, the elastic cord 13 cannot be wound up, causing the spur gear 25 and the toothed ring 24 to be unable to rotate. At this time, the continued rotation of the ratchet 22 will cause the teeth between the ratchet 22 and the toothed ring 24 to slip, thereby avoiding the ratchet 22 from rotating excessively and causing the patient to be excessively compressed and uncomfortable.

[0031] On the other hand, since the meshing surface between the ratchet 22 and the gear ring 24 is large when the ratchet 22 rotates counterclockwise, the gear ring 24 cannot rotate counterclockwise when the ratchet 22 does not rotate counterclockwise. This effectively counteracts the tendency of the elastic rope 13 to pull the spur gear 25 to rotate in the opposite direction due to being wound up. That is, the clockwise rotation of the base plate 2 achieves the tightening of the restraint steel belt, and the maximum tightening degree is controlled by the patient's body shape, thereby ensuring that the maximum pressure on patients of different body shapes is consistent. The counterclockwise rotation of the base plate 2 achieves the expansion of the restraint steel belt, enabling the removal of the restraint steel belt after surgery.

[0032] In summary, when the base plate 2 is manually pulled outward and rotated clockwise, the ratchet 22 drives the gear ring 24 to rotate clockwise simultaneously. The gear ring 24 further drives the spur gear 25 to rotate counterclockwise. At this time, the spur gear 25 drives the elastic rope 13 to wind up, and the two side straps 11 move closer to the back strap 1 and the abdominal strap 12. The abdominal strap 12 is pulled downward by the elastic rope 13, thus compressing the patient's chest and abdomen to restrict the patient's breathing range. When the elastic rope 13 is wound up to its maximum extent, the base plate 2 is manually pressed inward. At this time, the spline of the fixing pin 21 and the cover plate 23 engages again. The base plate 2 and the fixing pin 21 are restricted by the fixing effect of the cover plate 23 and the back strap 1 and cannot rotate, thus achieving self-locking of the tightness of the restraint steel belt.

[0033] Example 3:

[0034] Please see Figure 5 , Figure 6 as well as Figure 7This embodiment further illustrates the following based on Embodiment 2: A reciprocating lead screw 31 is passed through the middle section of the fixed platform 3. One end of the reciprocating lead screw 31 extends out of the fixed platform 3 and is fixedly connected to a knob 32. A threaded ring 33 is meshed and driven on the outer contour of the middle section of the reciprocating lead screw 31. A bracket 34 is fixedly connected to the top end of the threaded ring 33.

[0035] The adjusting mechanism also includes a fixing ring 4 fixedly connected to the bottom of the bracket 34 away from the threaded ring 33. A side plate 41 is fixedly connected to one side of the fixing ring 4. A compression spring 42 is fixedly connected to the surface of the side plate 41 pointing towards the fixing ring 4. A bevel gear 43 is fixedly connected to the end of the compression spring 42 away from the side plate 41.

[0036] A side plate 44 is fixedly connected to the other side of the fixed ring 4. A bevel gear 45 is meshed and driven at the end of the bevel gear 43 away from the compression spring 42. The bevel gear 45 is fixedly connected to the side plate 44. A connecting shaft 46 is fixedly connected to the end of the bevel gear 43 away from the compression spring 42. The connecting shaft 46 passes through the bevel gear 45 and the side plate 44 in sequence and extends out of the fixed ring 4. An adjusting ring 47 is fixedly connected to the end of the connecting shaft 46 away from the bevel gear 45.

[0037] As can be seen from Examples 1 and 2, after the patient's chest and abdomen are restrained, the doctor controls the position of the puncture component by controlling the distance adjustment mechanism, and moves the puncture component to the preset needle insertion point position on the patient's skin surface.

[0038] First, manually turn the knob 32, which drives the reciprocating screw 31 to rotate. At this time, the threaded ring 33 tends to rotate synchronously with the reciprocating screw 31. However, the threaded ring 33 is simultaneously limited by the fixed platform 3 and cannot rotate. Therefore, the rotation of the reciprocating screw 31 will cause the threaded ring 33 to move along the axial direction of the reciprocating screw 31, and the bracket 34 will move synchronously with the reciprocating screw 31.

[0039] Furthermore, due to the threaded design of the reciprocating screw 31, the threaded ring 33 will automatically reverse after moving to the axial end of the reciprocating screw 31, thereby realizing the reciprocating movement of the threaded ring 33 and the bracket 34 along the axial direction of the reciprocating screw 31. That is, the reciprocating screw 31 can rotate clockwise or counterclockwise in one direction to realize the bidirectional horizontal movement of the threaded ring 33 on the reciprocating screw 31. Moreover, the change of the rotation direction of the reciprocating screw 31 and the knob 32 can also control the horizontal reverse movement of the threaded ring 33. Therefore, medical staff can turn the knob 32 at will to adjust and control the horizontal position of the threaded ring 33 and the bracket 34.

[0040] Furthermore, the bracket 34 drives the puncture assembly to move synchronously until the puncture assembly is aligned with the preset needle insertion point. At this point, the knob 32 is stopped from being rotated, so that the puncture assembly is rigidly and stably positioned above the preset needle insertion point. Then, the puncture angle adjustment process begins.

[0041] At this time, the adjusting ring 47 is pressed inward by the operator. The adjusting ring 47 drives the connecting shaft 46 to move towards the side plate 41 inside the fixed ring 4. The fixed ring 4, side plate 41, side plate 44 and bevel gear 45 remain fixed under the constraint of the bracket 34. The connecting shaft 46 further drives the bevel gear 43 to move synchronously. During this process, the compression spring 42 is compressed and the bevel gear 43 and bevel gear 45 are in meshing contact.

[0042] Once the bevel gear 43 is no longer engaged with the second bevel gear 45, it is no longer limited by the second bevel gear 45. At this time, manually rotating the adjusting ring 47 will cause the connecting shaft 46 and the first bevel gear 43 to rotate synchronously. During this process, the compression spring 42 is twisted synchronously, and the adjusting ring 47 further drives the puncture assembly to rotate synchronously, thereby realizing the adjustment of the puncture angle.

[0043] After the puncture angle is adjusted to the preset angle, the rotational tendency of the adjusting ring 47 is manually countered and the adjusting ring 47 is pulled outward. At this time, due to the rebound effect of the compression spring 42, the bevel gear 43, the connecting shaft 46 and the adjusting ring 47 have the tendency to move outward. When the adjusting ring 47 is manually pulled outward, the bevel gear 43 moves outward synchronously and meshes with the bevel gear 45 again. Since the bevel gear 45 is always fixed, it limits the bevel gear 43 so that the bevel gear 43 cannot rotate. At this time, the compression spring 42 remains in a torsional state and cannot rotate.

[0044] In summary, the operator manually adjusts the position of the puncture assembly by rotating knob 32 to move the threaded ring 33 and the bracket 34 horizontally until the current puncture point of the puncture assembly coincides with the preset puncture point, at which point the rotation of knob 32 is stopped. Then, the operator presses and rotates the adjusting ring 47 to adjust the puncture angle. When the puncture angle reaches the preset angle, the operator counteracts the rotational tendency of the adjusting ring 47 and pulls the adjusting ring 47 outward to lock the puncture angle. After the operation, the operator presses the adjusting ring 47 to disengage the bevel gear 1 43 from the bevel gear 2 45. At this time, the compression spring 42 rotates, causing the bevel gear 1 43, the connecting shaft 46, the adjusting ring 47, and the entire puncture assembly to rotate synchronously, thus resetting the puncture assembly.

[0045] Example 4:

[0046] Please see Figure 8 and Figure 9This embodiment further illustrates the following based on implementation three: The puncture assembly includes a fixed seat 5 fixedly connected to the outer surface of the end of the adjusting ring 47 away from the connecting shaft 46. A fixed cylinder 51 is fixedly connected to the end of the fixed seat 5 away from the adjusting ring 47. A threaded portion 52 is provided on the outer contour of the top end of the fixed cylinder 51. A threaded sleeve 53 is screwed to the top end of the fixed cylinder 51 through the threaded portion 52.

[0047] The fixed cylinder 51 is penetrated by a puncture needle 6. A push plate 61 is fixedly connected to the top of the puncture needle 6. A needle tip 62 is provided at the bottom of the puncture needle 6. An injection tube 63 is penetrated by the inside of the puncture needle 6. The top of the injection tube 63 penetrates the push plate 61 and extends out of the outside of the push plate 61. A capsule 64 is fixedly connected to the bottom of the puncture needle 6 near the needle tip 62. The capsule 64 is in communication with the injection tube 63.

[0048] As can be seen from Example 3, after the positioning and angle adjustment are completed, the puncture operation begins. At this time, according to the puncture depth planned before the operation, the threaded sleeve 53 is manually rotated. Since the threaded part 52 and the fixed cylinder 51 are kept in a fixed state along with the fixed seat 5 and the adjusting ring 47, the rotation of the threaded sleeve 53 will cause it to move axially along the fixed cylinder 51 under the screw action of the threaded part 52. The distance between the bottom end of the push plate 61 and the top end of the threaded sleeve 53 is the maximum depth to which the puncture needle 6 penetrates the patient's skin. By rotating the threaded sleeve 53, the distance between it and the bottom end of the push plate 61 changes, thereby adjusting the depth of the puncture operation.

[0049] It should be noted that, due to the high number of turns in the threaded part 52, the axial travel of the threaded sleeve 53 is minimal when it rotates one revolution, thus achieving precise control over the puncture depth. When the puncture depth needs to be reduced, the threaded sleeve 53 is rotated clockwise to rise along the fixed cylinder 51. At this time, the distance between the top of the threaded sleeve 53 and the bottom of the push plate 61 is shortened, and the puncture depth is shortened accordingly. When the puncture depth needs to be increased, the threaded sleeve 53 is rotated counterclockwise to descend along the fixed cylinder 51. At this time, the distance between the top of the threaded sleeve 53 and the bottom of the push plate 61 is increased, and the puncture depth is increased accordingly.

[0050] Furthermore, the push plate 61 is manually pushed downwards, which causes the puncture needle 6 and the needle tip 62 to descend synchronously. The needle tip 62 pierces the patient's skin and continues to penetrate deeper until it reaches the liver tissue and the lesion area. This process occurs at the end of the patient's expiration phase, when the patient's diaphragm and lung muscles are at their highest level of relaxation, the lung volume is at its smallest, the diaphragm is at its highest and most static position, the displacement of the liver tissue is minimal, and the target area is most stable.

[0051] After the puncture is completed, a small amount of saline is injected into the cyst 64 through the injection tube 63. The cyst 64 begins to swell. At this time, since the needle tip 62 has already penetrated the liver tissue, the cyst 64 is also located inside the liver tissue. As a result, the swelling of the cyst 64 forms an anchor ball inside the liver tissue and gets stuck inside the liver tissue.

[0052] At this time, under the anchoring effect of the capsule 64, the liver tissue is anchored and limited by the capsule 64 and the puncture needle 6, and the degree of displacement caused by the patient's breathing is reduced to a minimum. Moreover, the flexible expansion of the capsule 64 minimizes the damage to the liver tissue.

[0053] After the anchoring operation is completed, radiofrequency ablation is performed on the lesion area of ​​the liver tissue through the puncture needle 6 and the needle tip 62. After the ablation operation is completed, the saline in the capsule 64 is aspirated through the injection tube 63 to shrink it, thereby releasing the flexible anchoring effect between it and the liver tissue. Then, the push plate 61 is manually pushed upward to withdraw the puncture needle 6 and the needle tip 62 from the patient's body.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multifunctional puncture positioning and fixation device for radiofrequency ablation of liver tissue, comprising a shoulder strap (1), characterized in that: It also includes a positioning component for achieving a fixing effect and a piercing component for achieving an insertion action. Side straps (11) are provided on both sides of the back strap (1), and an abdominal belt (12) is provided at the top of the back strap (1). Elastic ropes (13) are connected through both ends of the back strap (1) and the abdominal belt (12). Both elastic ropes (13) pass through the side straps (11) at corresponding positions. A window (14) is opened on the surface of the abdominal belt (12). The positioning component includes a winding mechanism for controlling the degree of restraint and an adjustment mechanism for achieving rigid stability. The winding mechanism includes a base plate (2) disposed in the back strap (1), and the adjustment mechanism includes a fixed platform (3) fixedly connected to the upper surface of the abdominal belt (12).

2. The multifunctional puncture positioning and fixation device for radiofrequency ablation of liver tissue according to claim 1, characterized in that: A fixing pin (21) is fixedly connected to the top of the base plate (2). A ratchet (22) is fixedly connected to the outer contour of the middle section of the fixing pin (21). A cover plate (23) is fixedly connected to the top of the fixing pin (21) through a spline engagement. A gear ring (24) is meshed and driven on the outer contour of the ratchet (22). Spur gears (25) are meshed and driven on the outer contours of both sides of the gear ring (24). A positioning pin (26) is penetrated through the center of each spur gear (25).

3. The multifunctional puncture positioning and fixation device for radiofrequency ablation of liver tissue according to claim 2, characterized in that: The base plate (2) is movably connected to the shoulder strap (1), the cover plate (23) is fixedly connected to the center of the shoulder strap (1), the positioning pin (26) is fixedly connected to the shoulder strap (1) through, and the elastic rope (13) is wound around the middle section of the corresponding spur gear (25).

4. The multifunctional puncture positioning and fixation device for radiofrequency ablation of liver tissue according to claim 1, characterized in that: The middle section of the fixed platform (3) is penetrated by a reciprocating lead screw (31). One end of the reciprocating lead screw (31) extends out of the fixed platform (3) and is fixedly connected to a knob (32). A threaded ring (33) is meshed and driven on the outer contour of the middle section of the reciprocating lead screw (31). A bracket (34) is fixedly connected to the top of the threaded ring (33).

5. The multifunctional puncture positioning and fixation device for radiofrequency ablation of liver tissue according to claim 4, characterized in that: The adjusting mechanism also includes a fixing ring (4) fixedly connected to the bottom of the bracket (34) away from the threaded ring (33). A side plate (41) is fixedly connected to one side of the fixing ring (4). A compression spring (42) is fixedly connected to the surface of the side plate (41) pointing to the end of the fixing ring (4). A bevel gear (43) is fixedly connected to the end of the compression spring (42) away from the side plate (41).

6. The multifunctional puncture positioning and fixation device for radiofrequency ablation of liver tissue according to claim 5, characterized in that: A side plate (44) is fixedly connected to the other side of the fixed ring (4). The bevel gear (43) is meshed with the bevel gear (45) at the end away from the compression spring (42). The bevel gear (45) is fixedly connected to the side plate (44). A connecting shaft (46) is fixedly connected to the end of the bevel gear (43) away from the compression spring (42). The connecting shaft (46) passes through the bevel gear (45) and the side plate (44) in sequence and extends out of the fixed ring (4). An adjusting ring (47) is fixedly connected to the end of the connecting shaft (46) away from the bevel gear (45).

7. A multifunctional puncture positioning and fixation device for radiofrequency ablation of liver tissue according to claim 6, characterized in that: The puncture assembly includes a fixed seat (5) fixedly connected to the outer surface of the end of the adjusting ring (47) away from the connecting shaft (46). A fixed cylinder (51) is fixedly connected to the end of the fixed seat (5) away from the adjusting ring (47). A threaded part (52) is provided on the outer contour of the top end of the fixed cylinder (51). A threaded sleeve (53) is screwed to the top end of the fixed cylinder (51) through the threaded part (52).

8. A multifunctional puncture positioning and fixation device for radiofrequency ablation of liver tissue according to claim 7, characterized in that: The fixed cylinder (51) is penetrated by a puncture needle (6), and a push plate (61) is fixedly connected to the top of the puncture needle (6). The bottom end of the puncture needle (6) is provided with a needle tip (62). The inside of the puncture needle (6) is penetrated by an injection tube (63). The top end of the injection tube (63) penetrates the push plate (61) and extends out of the outside of the push plate (61). A capsule (64) is fixedly connected to the bottom end of the puncture needle (6) near the needle tip (62). The capsule (64) is connected to the injection tube (63).

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