Biopsy needle based on electrode cutting

Abstract

The invention discloses a biopsy needle based on electrode cutting, and belongs to the field of medical equipment, the biopsy needle comprises a cable, a handle, a needle rod and a needle head which are connected in sequence, and the handle is connected with a first negative pressure suction tube and a second negative pressure suction tube; a first negative pressure channel tube, a second negative pressure channel tube, a screw rod and an inner needle tube are arranged in the handle, an electrode tip is adopted on the inner needle tube for cutting, and living tissue sampling is completed through movement and cutting of the first negative pressure channel tube, the second negative pressure channel tube, the screw rod and the inner needle tube. The electrode tip is adopted for electrode cutting instead of a rotary cutting blade, rotary motion does not exist, noise is lower, cutting and coagulation can be achieved at the same time, bleeding is reduced, meanwhile, the situation that skin is planed due to the fact that the skin prolapses into a sample groove before the cutter advances into tissue is avoided, and pain and scars caused by sampling are reduced.

Description

Technical Field

[0001] The invention belongs to the field of medical equipment, and in particular relates to a rotary biopsy needle for cutting tissue. Background Art

[0002] The commonly used means of detecting tissue lesions at present is to obtain tissue samples for subsequent pathological testing, usually vacuum-assisted core biopsy, in which a larger sample is sucked in with vacuum assistance and cut by a cutter. Known biopsy devices can obtain multiple samples without removing the probe, which shortens the operation time and reduces the sampling procedures. In addition, this is also conducive to obtaining enough samples to completely remove the suspicious lesion.

[0003] The wide side opening of the biopsy device probe combined with vacuum assistance, particularly with a separate vacuum chamber, has many advantageous features. However, there are also situations where lesions near the skin are difficult to biopsy with a core biopsy probe, which is more often a challenge when sampling smaller breasts, especially when compressed in a positioning fixture that limits the choice of contact direction. If the side opening of the probe is partially exposed, the vacuum assistance will fail when the sample slot in the probe is exposed to atmospheric pressure. Moreover, the skin may prolapse into the sample slot before the cutter advances into the tissue, resulting in shaving of the skin, increasing the pain and scarring of the subsequent procedure.

[0004] In addition, the conventional biopsy device relies on the high-speed rotation of the inner needle tube to perform reciprocating cutting, which generates some noise and disturbs both doctors and patients. Therefore, there is a great need for a needle core biopsy device that can perform biopsy on suspicious lesions close to the skin while reducing unnecessary noise. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a biopsy needle based on electrode cutting, which solves the problems of noise during biopsy and skin shaving during cutting, which causes pain and scars.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is: a biopsy needle based on electrode cutting, comprising a cable, a handle, a needle rod and a needle connected in sequence, wherein the handle is connected to a first negative pressure suction tube and a second negative pressure suction tube;

[0007] The cable is used to connect to an external power source;

[0008] The handle comprises a motor assembly, an upper shell and a lower shell which are sequentially connected from top to bottom; the motor assembly is connected to a cable;

[0009] The needle rod comprises an outer needle tube, a cutting edge arranged at one end of the outer needle tube, and a third negative pressure channel tube arranged under the outer needle tube and in contact with the outer needle tube; one end of the outer needle tube and the third negative pressure channel tube are both connected to the handle;

[0010] The needle head is connected to one end of the cutting edge of the outer needle tube.

[0011] The beneficial effects of the present invention are as follows: the present invention designs a biopsy needle based on electrode cutting, which uses an electrode head for electrode cutting instead of a rotating cutting blade, does not have a rotating motion, has less noise, and can achieve cutting and coagulation at the same time, reducing bleeding, while avoiding skin prolapse into the sample groove before the cutter moves into the tissue, resulting in skin shaving, thereby reducing subsequent pain and scars.

[0012] Furthermore: the motor assembly is provided with a button, which is used to start and shut down the motor assembly; the upper shell is provided with a sampling slot, which is used to store biopsy tissue.

[0013] Furthermore: a screw, an inner needle tube, a first negative pressure channel tube, a first negative pressure interface and a second negative pressure interface are arranged between the upper shell and the lower shell of the handle;

[0014] The screw is provided with threads, which are loosely arranged at one end of the screw and densely arranged at the other end of the screw, a connector and a gear are provided at the loose end of the thread, the connector connects the screw and the inner needle tube, the gear is connected to the motor assembly, one end of the inner needle tube is connected to one end of the second negative pressure interface, the other end of the inner needle tube is connected to the needle rod, one end of the first negative pressure channel tube is connected to one end of the first negative pressure interface, the other end of the first negative pressure channel tube is connected to the needle rod, the other end of the first negative pressure interface is connected to the first negative pressure suction tube, and the other end of the second negative pressure interface is connected to the second negative pressure suction tube;

[0015] When the screw rotates, the connector moves forward and backward along the thread, moving faster where the thread is loose and slower where the thread is dense. When the connector moves, it drives the inner needle tube to move along the needle rod; the motor assembly drives the screw to rotate through the gear.

[0016] The beneficial effect of the above further scheme is that by arranging loose and dense threads on the screw, the travel speed of the inner needle tube can be controlled, and when cutting tissue, the inner needle tube is kept moving forward slowly, thereby improving the accuracy of tissue biopsy.

[0017] Further: the inner needle tube is specifically connected with a second negative pressure channel tube, an electrode head and a sealing sleeve;

[0018] One end of the inner needle tube is connected to the electrode head, and the electrode head is placed inside the outer needle tube of the needle rod. The other end of the inner needle tube is connected to one end of the second negative pressure channel tube, and is slidably sealed through the sealing sleeve and the second negative pressure channel tube. The other end of the second negative pressure channel tube is connected to the second negative pressure interface.

[0019] The electrode head comprises a semi-annular electrode wire and an insulating layer; the insulating layer is connected to both ends of the semi-annular electrode wire;

[0020] The sealing sleeve is used to enable the inner needle tube to slide along the second negative pressure channel tube;

[0021] The semi-annular electrode wire is the positive electrode, the inner needle tube is the negative electrode, and the semi-annular electrode wire and the inner needle tube form a plasma excitation bipolar structure for cutting tissue.

[0022] The beneficial effect of the above further solution is that by using an electrode head on the inner needle tube instead of a cutting blade, compared with cutting living tissue with a rotating blade, there is less noise, and coagulation is achieved while cutting, thereby reducing bleeding.

[0023] Furthermore: one end of the inner needle tube connected to the electrode head passes through the sampling slot of the upper shell and is connected to one end of the outer needle tube, one end of the third negative pressure channel tube is connected to the other end of the inner needle tube, the other ends of the outer needle tube and the third negative pressure channel tube are both connected to the needle head, a cutting edge is provided on the side of the outer needle tube close to the needle head, and a plurality of suction holes are provided inside the needle rod corresponding to the cutting edge, so that the outer needle tube is connected to the third negative pressure channel tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a biopsy needle based on electrode cutting according to the present invention;

[0025] Figure 2 It is a schematic diagram of the exploded structure of the handle in the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the inner needle tube and the electrode head in the present invention;

[0027] Figure 4 The needle structure and cross-sectional schematic diagram of the present invention;

[0028] Wherein: 1-cable, 2-handle, 3-needle rod, 4-needle, 5-first negative pressure suction tube, 6-second negative pressure suction tube, 7-motor assembly, 8-upper shell, 9-lower shell, 10-outer needle tube, 11-blade, 12-third negative pressure channel tube, 13-screw, 14-inner needle tube, 15-first negative pressure channel tube, 16-thread, 17-connector, 18-first negative pressure interface, 19-gear, 20-second negative pressure channel tube, 21-electrode head, 22-second negative pressure interface, 23-sealing sleeve, 24-sampling slot, 25-semi-annular electrode wire, 26-insulating layer, 27-suction hole, 28-button. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0030] like Figure 1 As shown, it is a schematic diagram of a biopsy needle based on electrode cutting of the present invention, comprising a cable 1, a handle 2, a needle rod 3 and a needle 4 connected in sequence; wherein the handle 2 is also connected to a first negative pressure suction tube 5 and a second negative pressure suction tube 6; the cable 1 is used to connect to an external power source;

[0031] like Figure 2 As shown, it is a schematic diagram of the exploded structure of the handle in the invention, such as Figure 3 As shown in FIG. 1 , it is a schematic diagram of the structure of the inner needle tube and the electrode head in the present invention. Figure 4 As shown, it is a schematic diagram of the needle structure and cross-section of the present invention; Figure 2 , Figure 3 and Figure 4 A biopsy needle based on electrode cutting of the present invention is specifically described as follows:

[0032] like Figure 2 As shown, the handle 2 includes a motor assembly 7, an upper shell 8 and a lower shell 9 which are sequentially snap-connected from top to bottom; the motor assembly 7 is connected to the cable 1; the needle rod 3 includes an outer needle tube 10, a cutting edge 11 arranged at one end of the outer needle tube 10, and a third negative pressure channel tube 12 arranged under the outer needle tube 10 and in contact with the outer needle tube 10; one end of the outer needle tube 10 and the third negative pressure channel tube 12 are both connected to the handle 2; the needle 4 is connected to one end of the cutting edge 11 of the outer needle tube 10; the needle 4 is used to pierce living tissue.

[0033] A screw 13, an inner needle tube 14, a first negative pressure channel tube 15, a first negative pressure interface 18 and a second negative pressure interface 22 are arranged between the upper shell 8 and the lower shell 9 of the handle 2; a thread 16 is arranged on the screw 13, and the thread 16 is loosely arranged at one end of the screw 13 and densely arranged at the other end of the screw 13. A connector 17 and a gear 19 are arranged at the loose end of the thread 16, the connector 17 connects the screw 13 and the inner needle tube 14, the gear 19 is connected to the motor assembly 7, one end of the inner needle tube 14 is connected to one end of the second negative pressure interface 22, the other end of the inner needle tube 14 is connected to the needle rod 3, one end of the first negative pressure channel tube 15 is connected to one end of the first negative pressure interface 18, the other end of the first negative pressure channel tube 15 is connected to the needle rod 3, the other end of the first negative pressure interface 18 is connected to the first negative pressure suction tube 5, and the other end of the second negative pressure interface 22 is connected to the second negative pressure suction tube 6;

[0034] Meanwhile, the motor assembly 7 is provided with a button 28, and the upper shell 8 is provided with a sampling slot 24. The button 28 is used to start and stop the motor assembly 7, and the sampling slot 24 is used to store biopsy tissue.

[0035] Specifically: when the screw 13 rotates, the connector 17 moves back and forth along the thread 16, moving faster in the loose part of the thread 16 and slower in the dense part of the thread 16. When the connector 17 moves, it drives the inner needle tube 14 to move along the needle rod 3; the motor assembly 7 drives the screw 13 to rotate through the gear 19.

[0036] like Figure 3 As shown, the inner needle tube 14 is specifically connected to the second negative pressure channel tube 20, the electrode head 21 and the sealing sleeve 23; one end of the inner needle tube 14 is connected to the electrode head 21, and the electrode head 21 is placed inside the outer needle tube 10 of the needle rod 3, and the other end of the inner needle tube 14 is connected to one end of the second negative pressure channel tube 20, and slidingly sealed with the sealing sleeve 23 and the second negative pressure channel tube 20, and the other end of the second negative pressure channel tube 20 is connected to the second negative pressure interface 22;

[0037] The electrode head 21 includes a semi-circular electrode wire 25 and an insulating layer 26; the insulating layer 26 is connected to both ends of the semi-circular electrode wire 25; the semi-circular electrode wire 25 is a positive electrode, the inner needle tube 14 is a negative electrode, and the semi-circular electrode wire 25 and the inner needle tube 14 form a plasma excitation bipolar structure for cutting tissue;

[0038] The sealing sleeve 23 is used to allow the inner needle tube 14 to slide along the second negative pressure channel tube 20;

[0039] like Figure 4As shown, one end of the inner needle tube 14 connected to the electrode head 21 passes through the sampling slot 24 of the upper shell 8, and is connected to one end of the outer needle tube 10, one end of the third negative pressure channel tube 12 is connected to the other end of the first negative pressure channel tube 15, and the other ends of the outer needle tube 10 and the third negative pressure channel tube 12 are both connected to the needle 4. A cutting edge 11 is provided on the side of the outer needle tube 10 close to the needle 4, and a plurality of suction holes 27 are provided inside the needle rod 3 corresponding to the cutting edge 11, so that the outer needle tube 10 is connected to the third negative pressure channel tube 12.

[0040] The working principle of a biopsy needle based on electrode cutting of the present invention is described below:

[0041] When in use, the button 28 on the handle 2 is used to start the motor assembly 7, and the motor assembly 7 rotates the gear 19 through the internal motor, and the gear 19 drives the screw 13 to rotate. When the screw 13 rotates, the inner needle tube 14 is pushed forward through the connector 17, so that the inner needle tube 14 passes through the outer needle tube 10 from the handle 2 through the sampling slot 24, and finally reaches the cutting edge 11, and the cutting edge 11 is blocked. In this process, the connector 17 drives the inner needle tube 14 to quickly reach the cutting edge 11 at the loose thread 16 on the screw 13. When reaching the cutting edge 11, due to the dense thread 16, the inner needle tube 14 will slowly move forward, which can improve the accuracy of tissue biopsy. With the assistance of images, the biopsy needle is used for breast puncture to reach the biopsy position directly;

[0042] When the biopsy position is reached, the motor assembly 7 is used to control the inner needle tube 14 to withdraw from the cutting edge 11, and negative pressure suction is started. The first negative pressure suction tube 5 passes through the first negative pressure interface 18, the first negative pressure channel tube 15, the third negative pressure channel tube 12 and the suction hole 27 to reach the cutting edge 11. Under the first negative pressure path, the tissue to be biopsied is sucked into the cutting edge 11 at the cutting edge 11. At this time, the motor assembly 7 is started to push the electrode head 21 of the inner needle tube 14 into the cutting edge 11 to cut the tissue. The cut tissue will enter the end of the inner needle tube 14. After the cutting is completed, the first negative pressure path is closed, and the second negative pressure path is started at the same time. The second negative pressure suction tube 6 passes through the second negative pressure interface 22 and The second negative pressure channel tube 20, at the same time, driven by the motor assembly 7, the inner needle tube 14 withdraws from the cutting edge 11 and the outer needle tube 10, and returns to the handle 2 through the sampling slot 24. The second negative pressure path is started to attract the cut tissue to prevent the tissue from falling when the inner needle tube 14 withdraws from the cutting edge 11. When the inner needle tube 14 passes through the sampling slot 24, the end of the second negative pressure channel tube 20 pushes out the tissue at the position of the electrode head 21, and the tissue will stay in the sampling slot 24. At this time, the inner needle tube 14 enters the handle 2 to complete tissue sampling, close the second negative pressure path, and use tweezers to take out the biopsy tissue in the sampling slot 24 to complete a sampling operation. Repeat the operation to perform multiple samplings.

[0043] The beneficial effects of the present invention are as follows: the present invention designs a biopsy needle based on electrode cutting, which uses an electrode head for electrode cutting instead of a rotating cutting blade, does not have a rotating motion, has less noise, and can achieve cutting and coagulation at the same time, reducing bleeding, while avoiding skin prolapse into the sample groove before the cutter moves into the tissue, resulting in skin shaving, thereby reducing subsequent pain and scars.

Claims

1. A biopsy needle based on electrode cutting, characterized in that: It comprises a cable (1), a handle (2), a needle rod (3) and a needle (4) which are connected in sequence, wherein the handle (2) is connected to a first negative pressure suction tube (5) and a second negative pressure suction tube (6); The cable (1) is used to connect to an external power source; The handle (2) comprises a motor assembly (7), an upper shell (8) and a lower shell (9) which are sequentially clamped from top to bottom; the motor assembly (7) is connected to the cable (1); The needle rod (3) comprises an outer needle tube (10), a cutting edge (11) arranged at one end of the outer needle tube (10), and a third negative pressure channel tube (12) arranged under the outer needle tube (10) and in contact with the outer needle tube (10); one end of each of the outer needle tube (10) and the third negative pressure channel tube (12) is connected to the handle (2); The needle head (4) is connected to one end of the cutting edge (11) of the outer needle tube (10).

2. The rotary biopsy needle according to claim 1, characterized in that: The motor assembly (7) is provided with a button (28), and the button (28) is used to start and shut down the motor assembly (7); The upper shell (8) is provided with a sampling groove (24), and the sampling groove (24) is used for storing biopsy tissue.

3. The rotary biopsy needle according to claim 1, characterized in that: A screw rod (13), an inner needle tube (14), a first negative pressure channel tube (15), a first negative pressure interface (18) and a second negative pressure interface (22) are arranged between the upper shell (8) and the lower shell (9) of the handle (2); The screw rod (13) is provided with a thread (16), the thread (16) is loosely arranged at one end of the screw rod (13), and densely arranged at the other end of the screw rod (13), the end of the loose thread (16) is provided with a connector (17) and a gear (19), the connector (17) connects the screw rod (13) and the inner needle tube (14), the gear (19) is connected to the motor assembly (7), one end of the inner needle tube (14) is connected to one end of the second negative pressure interface (22), the other end of the inner needle tube (14) is connected to the needle rod (3), one end of the first negative pressure channel tube (15) is connected to one end of the first negative pressure interface (18), the other end of the first negative pressure channel tube (15) is connected to the needle rod (3), the other end of the first negative pressure interface (18) is connected to the first negative pressure suction tube (5), and the other end of the second negative pressure interface (22) is connected to the second negative pressure suction tube (6); When the screw (13) rotates, the connector (17) moves forward and backward along the thread (16), moving faster at a sparse position of the thread (16) and slower at a dense position of the thread (16). When the connector (17) moves, it drives the inner needle tube (14) to move along the needle rod (3); the motor assembly (7) drives the screw (13) to rotate via the gear (19).

4. The rotary biopsy needle according to claim 3, characterized in that: The inner needle tube (14) is connected to a second negative pressure channel tube (20), an electrode head (21) and a sealing sleeve (23); One end of the inner needle tube (14) is connected to the electrode head (21), and the electrode head (21) is placed inside the outer needle tube (10) of the needle rod (3); the other end of the inner needle tube (14) is connected to one end of the second negative pressure channel tube (20), and is slidably sealed with the second negative pressure channel tube (20) through a sealing sleeve (23); the other end of the second negative pressure channel tube (20) is connected to the second negative pressure interface (22); The electrode head (21) comprises a semi-annular electrode wire (25) and an insulating layer (26); the insulating layer (26) is connected to both ends of the semi-annular electrode wire (25); The sealing sleeve (23) is used to enable the inner needle tube (14) to slide along the second negative pressure channel tube (20); The semi-annular electrode wire (25) is a positive electrode, the inner needle tube (14) is a negative electrode, and the semi-annular electrode wire (25) and the inner needle tube (14) form a plasma excitation bipolar structure for cutting tissue.

5. The rotary biopsy needle according to claim 4, characterized in that: One end of the inner needle tube (14) connected to the electrode head (21) passes through the sampling slot (24) of the upper shell (8) and is connected to one end of the outer needle tube (10). One end of the third negative pressure channel tube (12) is connected to the other end of the first negative pressure channel tube (15). The other ends of the outer needle tube (10) and the third negative pressure channel tube (12) are both connected to the needle head (4). A cutting edge (11) is provided on the side of the outer needle tube (10) close to the needle head (4), and a plurality of suction holes (27) are provided inside the needle rod (3) corresponding to the cutting edge (11), so that the outer needle tube (10) is connected to the third negative pressure channel tube (12).

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