A temperature-measuring ablation needle

Abstract

The present invention discloses a temperature-measurable ablation needle, which relates to the technical field of medical devices, and comprises a handle, on which a needle rod and a temperature-measuring mechanism are arranged, wherein the needle rod is used to puncture the lesion tissue and release microwaves to the lesion tissue; the temperature-measuring mechanism is arranged on the needle rod to measure the temperature at the center of the lesion tissue. The temperature-measurable ablation needle provided by the present invention can release microwave energy to the lesion tissue after the needle rod punctures the tissue, so as to cause dehydration, coagulation, and protein denaturation of the lesion tissue, leading to irreversible necrosis thereof, thereby achieving the purpose of treatment; at the same time, the temperature at the center of the lesion tissue can be measured by the temperature-measuring mechanism on the needle rod, so that the real temperature at the center of the lesion tissue can be measured without causing secondary damage to the patient.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a temperature-measurable ablation needle. Background Art

[0002] Microwave ablation has now become one of the important means of clinical treatment of solid tumor tissue. Microwave ablation is to apply high-frequency electromagnetic waves such as microwaves to human tumor tissue, and use microwave ablation needles to release microwave energy to tumor tissue. The polar molecules (mostly water) in the tumor tissue rotate at high speed under the action of the microwave field and quickly generate a large amount of heat. When the temperature rises to above 60°C, it causes tissue dehydration, coagulation, and protein denaturation, leading to irreversible necrosis, thus achieving the purpose of treatment.

[0003] For example, the patent document with the authorization announcement number CN101711705B and the authorization announcement date of April 6, 2011, and the name of the patent document is "A microwave ablation needle and a microwave ablation therapeutic device", which includes an ablation needle, an ablation needle tube, a microwave coaxial cable, a capillary, and a handle with a crank. Microwave energy enters the microwave coaxial cable from the high-frequency connector and is radiated through the ablation needle.

[0004] The temperature measuring needle is an important accessory for microwave ablation surgery. Its main purpose is to test the changes in tissue temperature during microwave ablation and provide reliability feedback to doctors. When in use, the temperature measuring needle is generally inserted parallel to the ablation needle at a distance of 1 cm to measure the temperature changes of the lesion tissue and provide a basis for the ablation process of the lesion tissue. Obviously, in actual operation, inserting the temperature measuring needle into the human body will cause secondary damage to the patient, and the temperature of the lesion tissue measured by the temperature measuring needle is generally the edge temperature, and the true temperature of the center of the lesion tissue cannot be measured. Summary of the invention

[0005] The purpose of the present invention is to provide a temperature-measurable ablation needle to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A temperature-measurable ablation needle comprises a handle, on which is provided:

[0008] A needle rod, which is used to puncture the lesion tissue and release microwaves to the lesion tissue;

[0009] The temperature measuring mechanism is arranged on the needle rod to measure the temperature at the center of the lesion tissue.

[0010] The temperature measuring mechanism of the above-mentioned temperature-measurable ablation needle includes a conductive wire arranged in the needle rod and a thermistor arranged at the end of the conductive wire.

[0011] In the above-mentioned temperature-measurable ablation needle, a sleeve is fixed on the handle, a connecting plate is fixed on the needle rod, and the connecting plate is slidably connected to the handle.

[0012] The outer wall of the needle rod of the above-mentioned temperature-measurable ablation needle is configured with a groove, an elastic sheet is fixed in the groove, and the thermistor is fixed at one end of the elastic sheet away from the needle rod.

[0013] The needle rod of the above-mentioned temperature-measurable ablation needle has a first position in which it is retracted into the sleeve and a second position in which it is extended out of the sleeve. The handle is provided with a first elastic member for forcing the needle rod to be in the second position. The handle is also provided with a limiting mechanism for limiting the needle rod to be in the first position.

[0014] The limiting mechanism of the above-mentioned temperature-measurable ablation needle includes a first wedge-shaped block constructed on the connecting plate, a second wedge-shaped block is arranged on the handle, and a second elastic member for forcing the second wedge-shaped block to approach the first wedge-shaped block is also arranged on the handle.

[0015] The handle of the above-mentioned temperature-measurable ablation needle is slidably connected with a button, a trigger plate is fixed on the button, and the handle is also provided with a third elastic member for forcing the button to move away from the handle.

[0016] The above-mentioned temperature-measurable ablation needle also includes a reset mechanism for driving the needle rod to reset from the second position to the first position.

[0017] The reset mechanism of the above-mentioned temperature-measurable ablation needle includes a connecting column fixed on a trigger plate, and the connecting plate is constructed with a first vertical groove, a horizontal groove, a second vertical groove and an oblique groove connected end to end, and the oblique groove extends from one end of the second vertical groove to the first vertical groove, and a connecting groove is constructed in the oblique groove, one end of the connecting groove is smoothly connected to the oblique groove, the end of the connecting column is elastically connected to a wedge-shaped column, and the connecting plate is elastically connected to an arc block.

[0018] The needle rod of the above-mentioned temperature-measurable ablation needle has a third position. During the process of the needle rod extending out of the sleeve, the needle rod is in the third position, the first position and the second position in sequence.

[0019] In the above technical scheme, the present invention provides a temperature-measurable ablation needle, which can release microwave energy to the diseased tissue after the needle rod punctures the tissue, so as to cause dehydration, coagulation, and protein denaturation of the diseased tissue, leading to irreversible necrosis, thereby achieving the purpose of treatment; at the same time, the temperature of the center of the diseased tissue can be measured through the temperature measuring mechanism on the needle rod, so that the actual temperature of the center of the diseased tissue can be measured without causing secondary damage to the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a temperature measuring mechanism provided in yet another embodiment of the present invention;

[0023] Figure 3 A schematic cross-sectional view of a casing provided in yet another embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the expanded structure of a thermistor provided by another embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the structure in the cavity provided by another embodiment of the present invention;

[0026] Figure 6 A front view of a structure in a cavity provided by another embodiment of the present invention;

[0027] Figure 7 A side view of a structure in a cavity provided by another embodiment of the present invention;

[0028] Figure 8 A schematic diagram of the structure of a connecting plate provided in another embodiment of the present invention;

[0029] Fig. 9 A cross-sectional view of a connecting plate and a connecting column provided in another embodiment of the present invention;

[0030] Fig.10 A cross-sectional view of a connecting column provided in another embodiment of the present invention;

[0031] Fig.11 A schematic diagram of a connecting column abutting against an arc-shaped block structure provided by another embodiment of the present invention;

[0032] Fig.12 A schematic diagram of a third vertical slot structure provided in yet another embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Handle; 2. Needle rod; 201. Coaxial cable; 202. Microwave emitting area; 3. Conductive wire; 4. Thermistor; 5. Sleeve; 6. Cavity; 7. Slider; 8. Groove; 9. Elastic sheet; 10. Connecting plate; 11. First spring; 12. First wedge block; 13. Second wedge block; 14. Button; 15. Trigger plate; 16. Second spring; 17. Third spring; 18. Extension; 19. Connecting column; 20. First vertical groove; 21. Horizontal groove; 22. Second vertical groove; 23. Oblique groove; 24. Connecting groove; 25. Wedge column; 26. Arc block; 27. Fourth spring; 28. Fifth spring; 29. ​​Third vertical groove; 30. Third wedge block; 31. Guide rod. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Reference Figure 1-12 An embodiment of the present invention provides a temperature-measurable ablation needle, comprising a handle 1, on which a needle rod 2 and a temperature measuring mechanism are provided. The needle rod 2 is used to puncture the lesion tissue and release microwaves to the lesion tissue; the temperature measuring mechanism is provided on the needle rod 2 to measure the temperature of the center of the lesion tissue.

[0037] Specifically, the handle 1 and the needle rod 2 are the basic structure of the ablation needle. A coaxial cable 201 is generally provided in the needle rod 2. The end of the coaxial cable 201 away from the handle 1 is set as a microwave emitting area 202 (the end of the needle rod 2 away from the handle 1 is constructed as a needle tip to puncture the tissue, and the microwave emitting end is located on the side of the needle tip close to the handle 1). Microwave energy can be emitted to the lesion tissue through the microwave emitting area 202. The other end of the coaxial cable 201 extends to the handle 1 and is provided with a high-frequency connector to connect to an external device through the high-frequency connector. The above are all prior arts and are not repeated here. The innovation of the embodiment of the present invention is that a temperature measuring mechanism is provided on the needle rod 2. The temperature measuring mechanism can use a temperature sensor or other structure in the prior art. The temperature measuring mechanism is located inside or on the outer wall of the needle rod 2, which is close to the microwave emitting end. That is, when microwave energy is emitted to the lesion tissue through the microwave emitting end, the temperature measuring mechanism can measure the real temperature of the center of the lesion tissue, so that the temperature change of the lesion tissue can be fed back in time, thereby providing a real and reliable basis for the ablation process.

[0038] A temperature-measurable ablation needle provided in an embodiment of the present invention can release microwave energy to the lesion tissue after the needle rod 2 punctures the tissue, so as to cause dehydration, coagulation, and protein denaturation of the lesion tissue, resulting in irreversible necrosis thereof, thereby achieving the purpose of treatment; at the same time, the temperature of the center position of the lesion tissue can be measured by the temperature measuring mechanism on the needle rod 2, so that the actual temperature of the center position of the lesion tissue can be measured without causing secondary damage to the patient.

[0039] In another embodiment provided by the present invention, further, the temperature measuring mechanism includes a conductive wire 3 arranged in the needle rod 2 and a thermistor 4 arranged at the end of the conductive wire 3. Specifically, the surface of the needle rod 2 is insulated, and the conductive wire 3 is introduced into the insulating surface to form a path with the thermistor 4. The thermistor 4 senses temperature changes and transmits signals through the conductive wire 3 to feedback the real temperature of the center of the lesion tissue; the thermistor 4 is insulated on the outside, and the insulating material can use one or more of Al2O3 ceramics, Si3N4 ceramics, and TiO2 insulating materials, and the PVD process and spraying process can also be used as the insulation treatment process; the thermistor 4 is preferably made of slurry material, and the thermistor slurry can be a positive temperature coefficient thermistor (PTC) or a negative temperature coefficient thermistor (NTC), and the test range is 0-200°C.

[0040] The present invention also provides a method for preparing a thermistor slurry in an embodiment, comprising the following steps: 1. Weighing and grinding 30-70% RuO2 and 30-70% Bi2O3 by mass, placing them in an environment of 500-650°C, and taking them out after 24 hours; 2. Weighing and grinding 30-70% RuO2 and 30-70% PbO by mass, placing them in an environment of 600-800°C, and taking them out after 24 hours; 3. Weighing and grinding 10-90% RuO2 and 10-90% CuO by mass, placing them in an environment of 700-1000°C, and taking them out after 24 hours; 4. Selecting an inorganic binder. Since most of the thermosensitive slurry binders currently used are polymer additives, the melting point and thermal decomposition temperature are low, and they are easily deactivated under high temperature conditions, and the bonding performance is attenuated under high temperature conditions. In the embodiment of the present invention, a high temperature resistant inorganic material is selected, and borosilicate glass is used as the main body to add an inorganic modifier with a mass fraction of 1% to 10%. Mix the above ingredients in a certain proportion and put them into a crucible, place it in an environment of 1000-1500℃, take it out after 30 minutes, quench it in water, and ball-mill it to an average particle size of <5μm; 5. Mix the above materials, add 10-50% by mass fraction of organic carrier, and prepare it into slurry. According to the screen printing mesh number, choose the appropriate proportion to prepare slurries of different viscosities.

[0041] In another embodiment of the present invention, further, a sleeve 5 is fixed on the handle 1, and a connecting plate 10 is fixed on the needle bar 2, and the connecting plate 10 is slidably connected to the handle 1. Specifically, the inner wall of the sleeve 5 is adapted to the outer wall of the needle bar 2, so that the needle bar 2 can slide in the sleeve 5; a cavity 6 is constructed in the handle 1, and the needle bar 2 passes through the sleeve 5 and extends into the cavity 6. Correspondingly, the coaxial cable 201 in the needle bar 2 is also passed through the cavity 6, so that the needle bar 2 has a certain sliding stroke in the sleeve 5 and the cavity 6; preferably, a sliding groove is constructed on the inner wall of the cavity 6, and a slider 7 is fixed on the outer wall of the connecting plate 10, and the slider 7 is slidably connected in the sliding groove (that is, the connecting plate 1 0 is slidably connected to the cavity 6 of the handle 1 through the slider 7, so as to limit the needle bar 2 through the connecting plate 10 and the slide groove, and try to prevent the needle bar 2 from rotating during the sliding process along the sleeve 5; when the needle bar 2 is retracted into the sleeve 5, the microwave emitting area 202 is inside the sleeve 5, and when the needle bar 2 is extended out of the sleeve 5, the microwave emitting area 202 is outside the sleeve 5; a linear drive structure can be set on the handle 1 to drive the needle bar 2 to slide in the sleeve 5, such as an electric push rod, etc., which is preferably arranged The advantage is that, when in use, the sleeve 5 and the needle rod 2 are relatively still and puncture the lesion position synchronously. Since the area of ​​the lesion to be ablated is uncertain, the needle rod 2 may need to adjust its position for secondary ablation when in use. At this time, the linear drive structure can drive the needle rod 2 to slide relative to the sleeve 5, thereby changing the position of the microwave emission area 202 on the needle rod 2, and then ablating the lesions at other positions; in the process of adjusting the relative position of the needle rod 2 and the sleeve 5, the sleeve 5 and the normal tissue of the human body are in a relatively still state, so as to minimize the damage to the normal tissue of the human body; when the lesion tissue is ablated by the microwave emission area 202, the lesion tissue may adhere to the outer wall of the needle rod 2 (that is, adhere to the outer wall where the microwave emission area 202 is located). When the needle rod 2 is relatively retracted into the sleeve 5, the material adhered to the outer wall of the needle rod 2 can be removed through the end of the sleeve 5, so as to minimize the damage to other parts of the human body caused by the material adhered to the needle rod 2.

[0042] Preferably, the outer wall of the needle rod 2 is configured with a groove 8, an elastic sheet 9 is fixed in the groove 8, and the thermistor 4 is fixed at the end of the elastic sheet 9 away from the needle rod 2. Specifically, in this embodiment, the thermistor 4 is arranged in the groove 8 and connected by the conductive wire 3; the elastic sheet 9 itself has a certain elasticity to force the thermistor 4 at the end of the elastic sheet 9 to be away from the needle rod 2, that is, to force the thermistor 4 to move out of the groove 8; the elastic sheet 9 and other structures are located on the side of the microwave emission area 202 close to the handle 1; when the needle rod 2 is retracted into the sleeve 5, the inner wall of the sleeve 5 can resist the outer wall of the elastic sheet 9 to force the elastic sheet 9 to fit into the groove 8, thereby driving the thermistor 4 to be retracted into the groove 8; when the needle rod 2 extends out of the sleeve 5, the elastic sheet 9 loses the resistance of the inner wall of the sleeve 5, so that the elastic sheet 9 can be ejected under the action of its own elastic force, thereby driving the thermistor 4 to move out of the groove 8. The function is that when the needle rod 2 is retracted into the sleeve 5 and punctured to the lesion position at the same time, the needle rod 2 can be moved out of the sleeve 5 to drive the thermistor 4 to be exposed, so that the thermistor 4 is moved out of the groove 8 under the action of the elastic sheet 9 and hits the center position of the lesion tissue, thereby measuring the real temperature of the center position of the lesion; after the ablation operation is completed, the needle rod 2 is retracted into the sleeve 5 to force the thermistor 4 and the elastic sheet 9 to be retracted into the groove 8 through the inner wall of the sleeve 5, and at the same time, the material attached to the outer wall of the needle rod 2 and the elastic sheet 9 can be removed through the sleeve 5, so as to avoid the ablated material from being brought to other positions of the human body as much as possible.

[0043] When the lesion tissue is attached to the surface of normal tissue and the surface of the lesion tissue is relatively smooth, the needle rod 2 is prone to slip when puncturing the lesion (that is, the lesion tissue will deform to avoid puncture when it is resisted by the needle tip), making it difficult to directly puncture the lesion tissue, which will affect the operation of ablation. As an alternative to the above-mentioned linear drive structure driving the needle rod 2 to slide along the sleeve 5, further, the needle rod 2 has a first position of being retracted into the sleeve 5 and a second position of being extended out of the sleeve 5, and the handle 1 is provided with a first elastic member for forcing the needle rod 2 to be in the second position, and the handle 1 is also provided with a limiting mechanism for limiting the needle rod 2 to be in the first position. Specifically, when the needle rod 2 is in the first position, the microwave emitting area 202 (and the thermistor 4) are correspondingly retracted into the sleeve 5, and when the needle rod 2 is in the second position, the microwave emitting area 202 (and the thermistor 4) are correspondingly extended out of the sleeve 5; the first elastic member can select an elastic structure such as an elastic telescopic rod in the prior art, preferably, the first elastic member is a first spring 11, the first spring 11 is in a compressed state and the two ends are respectively fixed on the connecting plate 10 and the handle 1. The end of the needle rod 2 away from the needle tip is located in the cavity 6, the connecting plate 10 is located in the cavity 6 and fixed to the end of the needle rod 2, the coaxial cable 201 in the needle rod 2 extends to the tail end of the handle 1 and is connected to the high-frequency connector (the coaxial cable 201 in the handle 1 can adapt to the relative displacement of the needle rod 2 and the sleeve 5, such as a flexible cable or a sliding joint, etc., to avoid interference between the coaxial cable 201 and the structure in the cavity 6 as much as possible), the first spring 11 is sleeved on the coaxial cable 201, and is in a compressed state to force the connecting plate 10 and the needle rod 2 away from the cavity 6 (that is, to force the needle rod 2 to extend out of the sleeve). Tube 5); the limiting mechanism can select a sliding block structure in the prior art (not shown). When the needle bar 2 is in the first position, the first spring 11 is compressed by the connecting plate 10. At this time, the position of the connecting plate 10 can be limited by the block structure to force the needle bar 2 to be in the first position. When the block is removed to release the restriction on the connecting plate 10, the needle bar 2 can be instantly popped out under the elastic force of the first spring 11, thereby forcing the needle bar 2 to instantly move out of the sleeve 5 to the second position. At this time, the end of the connecting plate 10 away from the first spring 11 hits the inner wall of the cavity 6 and cannot move further. The effect of such a setting is that, in the present embodiment, the movement of the needle rod 2 from the first position to the second position is elastically driven, and this process is relatively rapid. Accordingly, the movement of the needle rod 2 from the second position to the first position can be completed manually; when the needle rod 2 and the sleeve 5 are synchronously pierced into the human body, the needle rod 2 is in the first position, and when the needle tip moves to the lesion position, the user first adjusts the position of the needle rod 2, and then releases the restriction of the needle rod 2 by the restriction mechanism, so that the needle rod 2 can be quickly extended out of the sleeve 5 under the action of the first elastic member, so that a strong puncture force can be generated instantly to complete the puncture of the lesion tissue and try to avoid the needle tip from moving away from the surface of the lesion tissue.

[0044] Preferably, the limiting mechanism includes a first wedge block 12 constructed on the connecting plate 10, a second wedge block 13 is provided on the handle 1, and a second elastic member for forcing the second wedge block 13 to approach the first wedge block 12 is also provided on the handle 1. A button 14 is slidably connected to the handle 1, a trigger plate 15 is fixed to the button 14, and a third elastic member for forcing the button 14 to move away from the handle 1 is also provided on the handle 1. Specifically, the second wedge block 13 is located in the cavity 6, and a guide rod 31 (such as Figure 7 As shown in the figure, the guide rod 31 is inserted into the inner wall of the cavity 6 (similar to the telescopic rod structure), and the second wedge block 13 slides in the cavity 6 through the guide rod 31, which has a certain sliding stroke; the second elastic member can select an elastic structure such as an elastic telescopic rod in the prior art. Preferably, the second elastic member is a second spring 16, one end of the second spring 16 is fixed to the inner wall of the cavity 6, and the other end is fixed to the bottom of the second wedge block 13, so that the second spring 16 forces the second wedge block 13 to approach the first wedge block 12; when the needle bar 2 is in the first position, the second wedge block 13 is on the side of the first wedge block 12 away from the first spring 11, so as to pass through the second The wedge block 13 contacts the first wedge block 12, thereby limiting the position of the needle rod 2 and the connecting plate 10; a through groove communicating with the cavity 6 is constructed on the handle 1, and the button 14 is slidably connected in the through groove, and the trigger plate 15 is located in the cavity 6 and fixed to the end of the button 14; the third elastic member is a third spring 17, and the two ends of the third spring 17 are respectively fixed to the inner wall of the cavity 6 and the end of the trigger plate 15, so that the trigger plate 15 and the button 14 are forced to move away from the second wedge block 13 through the third spring 17, that is, the button 14 is forced to move away from the handle 1; the connecting plate 10 and the trigger plate 15 are both constructed in a U shape, and the trigger plate 15 is located on the inner side of the connecting plate 10 (such as Figure 5 As shown in the figure, the second wedge block 13 is provided with an extension portion 18, and the end of the extension portion 18 is located on the sliding stroke of the end of the trigger plate 15, that is, when the button 14 is pressed, the trigger plate 15 moves with the button 14 and resists the third spring 17. During the process, the bottom end of the trigger plate 15 presses the end of the extension portion 18 to force the second wedge block 13 to press the second spring 16, so that the second wedge block 13 is separated from the first wedge block 12, thereby releasing the restriction of the second wedge block 13 on the first wedge block 12, so that the connecting plate 10 and the needle rod 2 can be ejected under the action of the first spring 11 ( Figure 5 and Figure 6In the embodiment, the needle rod 2 is in the second position), so the needle rod 2 can be controlled by the button 14 to move quickly from the first position to the second position, thereby increasing the puncture force of the needle rod 2; conversely, when the needle rod 2 is retracted into the sleeve 5, the connecting plate 10 moves into the cavity 6 with the needle rod 2. At this time, the wedge surface of the first wedge block 12 contacts the wedge surface of the second wedge block 13, thereby forcing the second wedge block 13 to squeeze the second spring 16 and be misaligned with the first wedge block 12, until the needle rod 2 moves to the first position, and the second wedge block 13 contacts the first wedge block 12 under the action of the second spring 16, thereby limiting the needle rod 2 to the first position again.

[0045] In another embodiment provided by the present invention, further, a reset mechanism is included for driving the needle bar 2 to reset from the second position to the first position. Specifically, in the above embodiment, after the needle bar 2 moves from the first position to the second position, the reset of the needle bar 2 needs to be completed manually, which is obviously not convenient enough. In this embodiment, the reset mechanism can use an electric push rod structure in the prior art, which is arranged in the cavity 6 and is on the side of the connecting plate 10 away from the first spring 11. When the needle bar 2 moves to the second position, the connecting plate 10 moves to one side of the cavity 6. At this time, the electric push rod structure can push the connecting plate 10 to squeeze the first spring 11, thereby driving the needle bar 2 to reset to the first position, which is convenient for releasing the restriction of the second wedge block 13 on the needle bar 2 through the button 14 next time.

[0046] As an alternative solution for the above-mentioned electric push rod structure to drive the needle bar 2 to reset to the first position. Preferably, the reset mechanism includes a connecting column 19 fixed on the trigger plate 15, and the connecting plate 10 is constructed with a first vertical groove 20, a horizontal groove 21, a second vertical groove 22 and an oblique groove 23 connected end to end, and the oblique groove 23 extends from one end of the second vertical groove 22 to the first vertical groove 20, and a connecting groove 24 is constructed in the oblique groove 23, and one end of the connecting groove 24 is smoothly connected to the oblique groove 23, the end of the connecting column 19 is elastically connected to a wedge column 25, and the connecting plate 10 is elastically connected to an arc block 26. Specifically, as Fig. 9As shown, the first vertical slot 20, the horizontal slot 21 and the second vertical slot 22 are U-shaped as a whole, one end of the inclined slot 23 is connected to the end of the second vertical slot 22, and the other end is connected to the first vertical slot 20, the first vertical slot 20, the horizontal slot 21, the second vertical slot 22 and the inclined slot 23 have the same depth, the connecting slot 24 is constructed along the length direction of the inclined slot 23 and has a depth greater than the depth of the inclined slot 23; the end of the connecting column 19 away from the trigger plate 15 is constructed with a wedge-shaped slot, the wedge column 25 is slidably connected in the wedge-shaped slot, and a fourth elastic member is arranged in the wedge-shaped slot to force the wedge column 25 away from the wedge-shaped slot, and the fourth elastic member is preferably a fourth spring 27 (fourth elastic member). The fourth spring 27 has two ends respectively fixed on the wedge-shaped column 25 and the inner wall of the wedge-shaped groove, so that the wedge-shaped column 25 is forced to move to the side away from the connecting column 19 through the fourth spring 27; a movable groove is constructed on the connecting plate 10, and the arc block 26 is slidably connected in the movable groove. A fifth elastic member is provided on the connecting plate 10 to force the arc block 26 away from the first vertical groove 20. The fifth elastic member is preferably a fifth spring 28 (the fifth elastic member can also be a curved elastic sheet structure), and the two ends of the fifth spring 28 are respectively fixed on the arc block 26 and the inner wall of the movable groove to force the arc block 26 away from the first vertical groove 20. When the needle bar 2 is in the first position, the connecting column 19 is fixed on the outer wall of the trigger plate 15 and is located at the top of the first vertical groove 20. The second wedge block 13 contacts the first wedge block 12 under the action of the second spring 16, thereby limiting the needle bar 2 to the first position. At this time, pressing the button 14 can drive the trigger plate 15 to move in the cavity 6, thereby driving the connecting column 19 to move down along the first vertical groove 20 until the connecting column 19 passes the position where the first vertical groove 20 and the inclined groove 23 are connected (the connecting column 19 is not released from the arc block 26 during the process), and the end of the trigger plate 15 starts to move. The second wedge block 13 releases the restriction on the needle bar 2, so that the needle bar 2 can be ejected and moved to the second position under the action of the first spring 11; in the process of the needle bar 2 moving from the first position to the second position, the connecting column 19 moves relatively in the horizontal groove 21 to the position of the second vertical groove 22. At this time, the button 14 is released, and the button 14 can be forced to reset under the action of the third elastic member and drive the connecting column 19 to move to the top of the second vertical groove 22 (such as Figure 8As shown in the figure, during the above process, the wedge-shaped column 25 squeezes the fourth spring 27 and is received in the wedge-shaped groove, until the connecting column 19 moves relatively to the top of the second vertical groove 22, the wedge-shaped column 25 corresponds to the connecting groove 24 and is inserted into the connecting groove 24 under the action of the fifth spring 28, so that the position of the connecting column 19 can be limited by the wedge-shaped column 25, so that when the button 14 is pressed again, the connecting column 19 can only move along the oblique groove 23 but not along the second vertical groove 22; after the needle rod 2 punctures the lesion tissue, if the needle rod 2 is to be reset to the second position, the button 14 is pressed again, at this time, the outer wall of the wedge-shaped column 25 and the inner wall of the connecting groove 24 conflict with each other, and when the wedge-shaped column 25 and the connecting column 19 move downward with the button 14, the wedge-shaped column 25 can force The connecting plate 10 approaches the first spring 11, thereby squeezing the first spring 11. During the process, the depth of the connecting groove 24 gradually decreases, so that the wedge-shaped column 25 is resisted by the inner wall of the connecting groove 24, until the wedge-shaped column 25 moves to the connecting groove 24 and the oblique groove 23. The wedge-shaped column 25 is resisted again and is received in the wedge-shaped groove; when the connecting column 19 moves to the side of the oblique groove 23 close to the first vertical groove 20, the connecting column 19 resists the arc block 26 to force the arc block 26 to stretch the fifth spring 28, so that the arc block 26 moves synchronously with the connecting column 19 to the side of the first vertical groove 20, until the connecting column 19 moves to the connecting position of the first vertical groove 20 and the oblique groove 23, the arc block 26 moves to the end of the movable groove (such as Fig.11 As shown, at this time the button 14 cannot be pressed further), during the process, the connecting plate 10 drives the needle rod 2 to move to the first position, and the needle rod 2 is again restricted by the second wedge block 13 to remain in the first position. At this time, the button 14 is released, and under the action of the third spring 17, the button 14 can be reset and the connecting column 19 can be driven to move from the arc block 26 to the top of the first vertical groove 20 (the top of the arc block 26 is constructed with an opening, and the connecting column 19 can move up from the opening along the first vertical groove 20), and after the connecting column 19 moves up, the arc block 26 is also reset under the action of the fifth spring 28 (that is, when the button 14 is pressed again, the connecting column 19 will not interfere with the arc block 26), so that the above operation can be repeated when the button 14 is pressed next time.

[0047] The advantage is that, through the above structure, the limiting mechanism and the reset mechanism of the needle bar 2 are integrated into a single button 14, and different functions can be achieved by repeatedly pressing the same button 14; when the needle bar 2 is in the first position, pressing the button 14 can release the restriction of the second wedge block 13 on the needle bar 2, so that the needle bar 2 pops out to the second position, and the lesion tissue can be punctured during the process, and the relative movement of the needle bar 2 and the sleeve 5 can also release the elastic sheet 9, so that the elastic sheet 9 drives the thermistor 4 to move out of the groove 8; when the needle bar 2 is in the first position, the button 14 can release the restriction of the second wedge block 13 on the needle bar 2, so that the needle bar 2 pops out to the second position, and the lesion tissue can be punctured during the process, and the relative movement of the needle bar 2 and the sleeve 5 can also release the elastic sheet 9, so that the elastic sheet 9 drives the thermistor 4 to move out of the groove 8; When the rod 2 is in the second position, pressing the button 14 can adjust the relative position of the needle rod 2 and the sleeve 5, so as to adjust the position of the needle rod 2 without changing the position of the sleeve 5 and the handle 1, which is convenient for ablation operations at different positions of the diseased tissue. At the same time, the needle rod 2 can be retracted into the sleeve 5 to remove the material attached to the outer wall of the needle rod 2, and try to avoid bringing the diseased tissue to other places. The needle rod 2 can also be retracted into the sleeve 5 by pressing this time, which is convenient for the next operation. By repeatedly pressing the button 14, different functions can be achieved.

[0048] In another embodiment provided by the present invention, further, the needle bar 2 has a third position, and in the process of the needle bar 2 extending out of the sleeve 5, the needle bar 2 is in the third position, the first position, and the second position in sequence. Specifically, in the above embodiment, the needle bar 2 is in the first position when it is retracted into the sleeve 5, and is in the second position when it is extended out of the sleeve 5. When the needle tube is retracted into the sleeve 5, the microwave emission area 202 (and the thermistor 4) is also synchronously retracted into the sleeve 5. At this time, the needle bar 2 cannot be used normally. For patients with larger lesion tissues, the user needs to adjust the position of the needle bar 2 and then remove the needle bar 2 from the sleeve 5 again before continuing ablation; in this embodiment, the needle bar 2 can continue to be retracted into the sleeve 5 and moved to the third position when it is in the first position. The movement of the needle bar 2 from the third position to the first position corresponds to the removal of the microwave emission area 202 (and the thermistor 4) from the sleeve 5. Then the movement of the needle bar 2 between the first position and the second position corresponds to the adjustment of the position of the needle bar 2. In this way, the needle bar 2 can be driven to move to different positions to achieve different functions.

[0049] Preferably, the connecting plate 10 is provided with a third vertical groove 29, which is located on a side of the first vertical groove 20 away from the second vertical groove 22, and the horizontal groove 21 extends to the third vertical groove 29. The connecting plate 10 is also provided with a third wedge block 30. Specifically, as Fig.12As shown, the connecting plate 10 is constructed with a first wedge block 12 and a third wedge block 30. The first wedge block 12 is located on the side of the third wedge block 30 close to the first spring 11. When the second wedge block 13 abuts against the first wedge block 12, the needle rod 2 can be restricted to the first position. Accordingly, the connecting column 19 is located in the first vertical groove 20 at this time; when the second wedge block 13 abuts against the third wedge block 30, the needle rod 2 can be restricted to the third position. Accordingly, the connecting column 19 is located in the third vertical groove 29 at this time; no matter whether the needle rod 2 is in the first position or the third position, the end of the trigger plate 15 can abut against the extension portion 18, that is, when the connecting column 19 is located in the first vertical groove 20 or the third vertical groove 29, pressing the button 14 can The trigger plate 15 squeezes the second wedge block 13 to force the second wedge block 13 away from the connecting plate 10, thereby releasing the restriction of the second wedge block 13 on the first wedge block 12 or the third wedge block 30; the effect of such a setting is that when the needle rod 2 is retracted into the sleeve 5, the needle rod 2 is in the third position, at which time the microwave emitting area 202 (and the thermistor 4) are retracted into the sleeve 5, and the needle tip is located outside the sleeve 5, so that the lesion tissue is punctured synchronously by the needle tip and the sleeve 5; when the needle tip moves to the vicinity of the lesion tissue, the positions of the needle rod 2 and the sleeve 5 are adjusted and the button 14 is pressed, so that the connecting column 19 can be moved to the connecting position of the third vertical groove 29 and the horizontal groove 21, at which time the trigger plate 15 can contact the extension portion 18 and The second wedge block 13 is forced to move away from the connecting plate 10, thereby releasing the restriction of the second wedge block 13 on the third wedge block 30, so that the needle rod 2 and the connecting plate 10 can be ejected under the elastic force of the first spring 11. During the process, the connecting column 19 moves relatively to the connecting position of the horizontal groove 21 and the second vertical groove 22. At this time, the button 14 is released, and the connecting column 19 can move up to the top of the second vertical groove 22 with the button 14. This process is the puncture stroke of the lesion tissue by the needle rod 2; after completing the puncture of the lesion tissue, the needle rod 2 can be used normally to ablate the lesion tissue. If the area of ​​the lesion tissue is large, the needle tip can be punctured to the front end of the lesion tissue first (when the lesion tissue is large, the entire lesion tissue can be divided into a front end part and a rear end part The needle rod 2 is moved to the first position, and the second wedge block 13 is used to resist and restrict the first wedge block 12. After the button 14 is released, the connecting column 19 can move to the top of the first vertical groove 20. This process can drive the needle rod 2 to move from the second position to the first position. At this time, the microwave emitting area 202 (and the thermistor 4) extends out of the sleeve 5 to maintain normal use, so as to ablate the lesion tissue at the rear end after the needle rod 2 is retracted.When the lesion tissue needs to be ablated three or more times, the button 14 can be pressed again to squeeze the second wedge block 13 again through the contact plate, thereby forcing the second wedge block 13 to release the restriction on the first wedge block 12, so that the needle rod 2 can puncture the lesion tissue again to puncture and ablate different positions of the lesion tissue, thereby adapting to a larger range of lesions. The advantage is that in this embodiment, three positions of the needle rod 2 are set, and the switching of the three positions is integrated into a single button 14. By pressing the button 14, the needle rod 2 can be repeatedly moved between the three positions, thereby adapting to a larger range of lesions tissue, thereby performing comprehensive puncture and ablation of the lesion tissue. ;

[0050] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A temperature-measurable ablation needle, comprising a handle, characterized in that: The handle is provided with: A needle rod, which is used to puncture the lesion tissue and release microwaves to the lesion tissue; A temperature measuring mechanism, which is arranged on the needle rod to measure the temperature at the center of the lesion tissue; A sleeve is fixed on the handle, a connecting plate is fixed on the needle rod, and the connecting plate is slidably connected to the handle; The needle bar has a first position of being retracted into the sleeve and a second position of being extended out of the sleeve, the handle is provided with a first elastic member for forcing the needle bar to be in the second position, and the handle is also provided with a limiting mechanism for limiting the needle bar to be in the first position; Also includes a reset mechanism for driving the needle bar to reset from the second position to the first position; The reset mechanism includes a connecting column fixed on the trigger plate, and the connecting plate is configured with a first vertical groove, a horizontal groove, a second vertical groove and an oblique groove connected end to end. The oblique groove extends from one end of the second vertical groove to the first vertical groove. A connecting groove is configured in the oblique groove, and one end of the connecting groove is smoothly connected to the oblique groove. The end of the connecting column is elastically connected to a wedge column, and the connecting plate is elastically connected to an arc block.

2. A temperature-measurable ablation needle according to claim 1, characterized in that: The temperature measuring mechanism comprises a conductive wire arranged in the needle rod and a thermistor arranged at the end of the conductive wire.

3. The temperature-measurable ablation needle according to claim 2, characterized in that: The outer wall of the needle rod is configured with a groove, an elastic sheet is fixed in the groove, and the thermistor is fixed at one end of the elastic sheet away from the needle rod.

4. The temperature-measurable ablation needle according to claim 1, characterized in that: The limiting mechanism comprises a first wedge block constructed on the connecting plate, a second wedge block is arranged on the handle, and a second elastic member for forcing the second wedge block to approach the first wedge block is also arranged on the handle.

5. The temperature-measurable ablation needle according to claim 1, characterized in that: A button is slidably connected to the handle, a trigger plate is fixed to the button, and the handle is also provided with a third elastic member for forcing the button to move away from the handle.

6. The temperature-measurable ablation needle according to claim 1, characterized in that: The needle bar has a third position. During the process of the needle bar extending out of the sleeve, the needle bar is in the third position, the first position and the second position in sequence.

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