Negative pressure rotary cutter for endoscope

Abstract

The endoscope negative pressure rotary cutter comprises a handle, a battery, a motor, a switch, a connecting hole, a square hole and a clamping groove, the battery and the motor are arranged in the handle, the switch is arranged on the surface of the handle, the connecting hole in the end face of one end of the handle is a blind hole, an output shaft of the motor extends into the hole through the bottom of the handle, the square hole is formed in the end of the motor, the blind hole and the clamping groove are in an L shape, and the clamping groove is provided with an inner side wall of the connecting hole; one end of the outer pipe is inserted into the connecting hole and is fixed by the clamping bolt, the branch pipe is arranged on the outer side wall of the outer pipe, the other end of the outer pipe is in movable sealing connection with the cutting head, a pipe cavity of the cutting head is communicated with the pipe cavity of the cutting head, and the cutting head and the fixing rod can rotate relatively; one end of the inner shaft extends out of the outer pipe, the diameter of the inner shaft is increased to form a square shaft head, the square shaft head is inserted into the square hole, and the gap between the inner shaft and the outer pipe is sealed by a shaft sleeve; the invention has the advantages that the cutting head adsorbs and fixes tissues through negative pressure and rotates and cuts to obtain specimens, is suitable for narrow space operation and reduces injury.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an endoscopic negative pressure rotary cutter. Background Technology

[0002] Currently, common methods for obtaining intracavitary pathological tissue specimens via endoscopy for pathological diagnosis include biopsy forceps extraction and cryoprobe extraction. These methods are technically mature, easy to operate, and have been widely used in clinical practice.

[0003] However, in practice, the above-mentioned devices have the following problems: 1. Biopsy forceps require a certain amount of opening space, and operation is restricted in narrow cavities, making it difficult or resulting in small tissue samples, often failing to obtain satisfactory tissue specimens. 2. The operation method of cryoprobe freezing is relatively rough, easily pulling and tearing surrounding tissues, and even causing complications such as massive bleeding. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides an endoscopic negative pressure rotary cutter, which uses a cutting head to adsorb and fix tissues under negative pressure and then rotates to cut and obtain specimens. This allows for operation in confined spaces and avoids damage to surrounding tissues.

[0005] The technical solution adopted by this invention to solve the above-mentioned technical problems is as follows: an endoscopic negative pressure rotary cutter, comprising a handle, a battery, a motor, a switch, a connecting hole, a square hole, and a slot. The handle is a long, box-shaped structure, inside which the battery and the motor are housed. A switch for controlling the motor is mounted on its surface. The connecting hole, which is a blind hole, is located near the motor. The motor output shaft extends into the connecting hole through the bottom of the connecting hole, and the end of the output shaft has the square hole, which is also a blind hole. The slot is L-shaped and located on the inner wall of the connecting hole. The endoscopic negative pressure rotary cutter also includes an outer tube and a slot. The device comprises a bolt, a branch pipe, a cutting head, a fixing rod, an inner shaft, and a bushing. The outer pipe is made of a hard material with lubricating properties. One end of the outer pipe can be inserted into the connecting hole for connection. A retaining bolt is provided on the outer side of the pipe wall at this end for engaging with the retaining groove. When the outer pipe is inserted into the connecting hole, the retaining bolt first engages with the vertical section of the retaining groove. Further insertion and rotation of the outer pipe allow the retaining bolt to enter the horizontal section of the retaining groove and engage, thus fixing the outer pipe within the connecting hole, preventing it from coming out or rotating. A branch pipe communicating with the outer pipe is also provided on the outer side wall. The other end of the outer pipe is sleeved on the... The cutting head, a cylindrical metal tube, is located proximal to the outer end of the cutting head. It communicates with the outer tube cavity via a dynamic seal. This dynamic seal is a contact seal achieved using a medical-grade micro-elastic sealing ring. The two tubes can rotate relative to each other, thus connecting the branch tube, the outer tube, and the cutting head cavity. A negative pressure suction device is connected to the branch tube, and negative pressure sequentially passes through the branch tube and the outer tube to reach the cutting head, achieving tissue adsorption and fixation. The fixing rod is the same length as the inner diameter of the cutting head, with its two ends fixed to the inner walls on both sides proximal to the cutting head. The inner shaft is a flexible metal shaft that passes through... The inner shaft of the outer tube is rotatable, with one end extending out of the outer tube cavity from the connection hole. This inner shaft, with a thickened diameter and a square head, can be inserted into the square hole for drive connection. The gap between the inner shaft and the outer tube is sealed at the outer tube opening by a bushing, restricting the inner shaft from moving laterally or longitudinally. The other end of the inner shaft extends into the cutting head through the outer tube cavity and is fixed at the midpoint of the fixing rod. Thus, when the switch is turned on, the motor output shaft drives the inner shaft, thereby causing the fixing rod and the cutting head to rotate together.

[0006] Furthermore, the cutting head is also equipped with a cutting window, a specimen chamber, a filter, a crossbar, and a cutting blade. The cutting window, with a sharp cutting edge, is located on the side wall of the distal section of the cutting head. The cutting window has sharp cutting edges on both sides and the distal edge, with a blunt-edged guide groove design at the cutting edge. Its outer edge is a smooth rounded corner, and its inner edge is a sharp blade. Inside the cutting head, in the cavity between the cutting window and the fixing rod, the specimen chamber and the filter are sequentially arranged. The specimen chamber is part of the cutting head's tubular cavity. The filter has a star-shaped support structure, fixed to the inner wall of the cutting head on all sides. It consists of a central hub and multiple ribs radiating outwards. Fan-shaped gaps are formed between adjacent ribs to allow fluid passage. These gaps allow blood, mucus, and other fluids to pass through while effectively blocking tissue fragments. The filter has a dynamic self-cleaning function as the cutting head rotates. The crossbar is the same length as the inner diameter of the cutting head, and its two ends are fixed to the cutting head. On the inner walls of both sides of the distal port, the cutter is long and fixedly installed on the section between the midpoint and one end of the crossbar. After the switch is turned on, the motor output shaft drives the inner shaft, which can drive the fixed rod, the cutting head, the filter screen, the cutting window, the crossbar, and the cutter to rotate together. The distal port and side wall of the cutting head are pressed against the tissue. The negative pressure suction device is connected to the branch tube. Under the action of negative pressure suction, the tissue is sucked into the cutting head cavity through the distal port of the cutting head and the cutting window. The cutter and the cutting window can rotate and cut. The cut tissue is recovered into the specimen chamber under the action of negative pressure suction. The filter screen can prevent the tissue in the specimen chamber from entering the outer tube lumen under the action of negative pressure suction. After the negative pressure suction is cut off, physiological saline is injected through the branch tube, and the tissue in the specimen chamber can be discharged through the cutting window and the distal port of the cutting head.

[0007] Compared with the prior art, the advantages of this invention are as follows: the tissue is adsorbed and fixed under negative pressure suction through the distal port of the cutting head and the cutting window, and then the tissue in the cavity of the cutting head is rotated and cut by the cutter and the cutting window to obtain the specimen. This device requires little operating space, has clear cutting boundaries, and avoids strong traction and tearing of surrounding tissues, thereby significantly reducing the risk of complications such as damage to surrounding tissues and bleeding, and greatly improving the safety and success rate of tissue sampling. At the same time, its star-shaped filter structure has self-cleaning ability when rotating, effectively preventing sticky substances from clogging the filter and ensuring the continuity of negative pressure suction. Attached Figure Description

[0008] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2This is a three-dimensional structural diagram of the cutting head and related structures of the present invention; Figure 3 This is a three-dimensional structural diagram of the outer tube of the present invention when it is not inserted into the connection hole. Detailed Implementation

[0009] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but this is not intended to limit the present invention.

[0010] Example 1: As shown in the figure, an endoscopic negative pressure rotary cutter includes a handle 1, a battery 3, a motor 2, a switch 4, a connecting hole 16, a square hole 18, and a slot 15. The handle 1 has a long, box-like structure, inside which the battery 3 and the motor 2 are located. A switch 4 for controlling the motor 2 is mounted on the surface. One end face has a connecting hole 16, which is a blind hole, close to the motor 2. The output shaft of the motor 2 extends into the connecting hole 16 through the bottom of the connecting hole 16, and the end of the output shaft has a square hole 18, which is a blind hole. The slot 15 is L-shaped and located on the inner side wall of the connecting hole 16. The endoscopic negative pressure rotary cutter also includes an outer... The outer tube 6 consists of a pipe 6, a bolt 14, a branch pipe 5, a cutting head 8, a fixing rod 17, an inner shaft 7, and a bushing 19. The outer tube 6 is made of a hard material with lubricating properties. One end of the outer tube 6 can be inserted into the connecting hole 16 for connection. A bolt 14 is provided on the outer side of the pipe wall at this end for engaging with the slot 15 for fixation. When the outer tube 6 is inserted into the connecting hole 16, the bolt 14 first engages with the vertical section of the slot 15. Continuing to insert and rotate the outer tube 6 allows the bolt 14 to enter the horizontal section of the slot 15 and achieve engagement, thereby fixing the outer tube 6 in the connecting hole 16, preventing it from being removed or rotated. A branch pipe communicating with the outer tube 6 is also provided on the outer side wall of the outer tube 6. 5. The other end of the outer tube 6 is fitted onto the proximal end of the cutting head 8. The cutting head 8 is a cylindrical metal tube that communicates with the lumen of the outer tube 6 and is dynamically sealed. This dynamic seal is a contact seal achieved using a medical micro elastic sealing ring. The two can rotate relative to each other, thereby connecting the branch tube 5, the outer tube 6, and the lumen of the cutting head 8. The negative pressure suction device is connected to the branch tube 5, and the negative pressure passes through the branch tube 5 and the outer tube 6 to reach the cutting head 8, so as to achieve the adsorption and fixation of tissue by the cutting head 8. The fixing rod 17 is the same length as the inner diameter of the cutting head 8, and its two ends are respectively fixed to the inner walls on both sides of the proximal end of the cutting head 8. The inner shaft 7 is flexible. The flexible metal shaft is inserted inside the outer tube 6 and can rotate relative to it. One end of the inner shaft 7 extends out of the outer tube 6 through the insertion hole 16 and is enlarged to form a square shaft head, which can be inserted into the square hole 18 to achieve a drive connection. The gap between the inner shaft 7 and the outer tube 6 is sealed at the opening of the outer tube 6 by the bushing 19, which restricts the inner shaft 7 from moving laterally or longitudinally. The other end of the inner shaft 7 extends into the cutting head 8 through the outer tube 6 and is fixed at the midpoint of the fixing rod 17. Thus, after the switch 4 is turned on, the output shaft of the motor 2 drives the inner shaft 7, which in turn drives the fixing rod 17 and the cutting head 8 to rotate together.

[0011] Example 2: As shown in the figure, the other structures are the same as in Example 1, except that the cutting head 8 is further provided with a cutting window 9, a specimen chamber 10, a filter screen 11, a crossbar 12, and a cutter 13. A cutting window 9 with a sharp cutting edge is opened on the side wall of the distal section of the cutting head 8. The cutting window 9 has sharp cutting edges on both sides and the distal edge. The cutting edge adopts a blunt edge guide groove design. Its outer edge is a smooth rounded corner, and its inner edge is a sharp blade. Inside the cutting head 8, from the cutting window 9 to the fixed Within the cavity between the rods 17, a specimen chamber 10 and a filter screen 11 are sequentially arranged. The specimen chamber 10 is part of the cavity of the cutting head 8. The filter screen 11 has a star-shaped support structure, fixed to the inner wall of the cutting head 8 on all sides. It consists of a central hub and multiple ribs radiating outwards. Fan-shaped gaps are formed between adjacent ribs to allow fluid to pass through. The size of these gaps allows fluids such as blood and mucus to pass through while effectively blocking tissue fragments. As the filter screen 11 rotates synchronously with the cutting head 8, centrifugal force is generated on the surface of its ribs, causing the fragments attached to it to be thrown off. The adhesive substance achieves dynamic self-cleaning. The crossbar 12 is the same length as the inner diameter of the cutting head 8, and its two ends are fixed to the inner walls on both sides of the distal port of the cutting head 8. The cutter 13 is long and strip-shaped, and is fixedly installed on the section between the midpoint and one end of the crossbar 12. After the switch 4 is turned on, the output shaft of the motor 2 drives the inner shaft 7, which can drive the fixed rod 17, the cutting head 8, the filter screen 11, the cutting window 9, the crossbar 12 and the cutter 13 to rotate together, pressing the distal port and side wall of the cutting head 8 against the tissue. The negative pressure suction device and the support The tubes 5 are connected. Under the action of negative pressure suction, the tissue is sucked into the cavity of the cutting head 8 through the distal port of the cutting head 8 and the window of the cutting window 9. The cutter 13 and the cutting window 9 can be rotated to cut. The cut tissue is recovered into the specimen chamber 10 under the action of negative pressure suction. The filter screen 11 can prevent the tissue in the specimen chamber 10 from entering the lumen of the outer tube 6 under the action of negative pressure suction. After the negative pressure suction is cut off, physiological saline is injected through the branch tube 5, and the tissue in the specimen chamber 10 can be discharged through the window of the cutting window 9 and the distal port of the cutting head 8.

[0012] Example 3: As shown in the figure, the other structures are the same as in Example 1. The difference is that when the outer tube 6 is inserted into the connecting hole 16, the square shaft head of the inner shaft 7 is first inserted into the square hole 18, and then the bolt 14 is inserted into the vertical section of the slot 15. The outer tube 6 is then inserted and rotated. The bolt 14 enters the horizontal section of the slot 15 and engages to fix the outer tube 6 in place, so that the outer tube 6 is fixed in the connecting hole 16 and cannot be pulled out or rotated. The inner shaft 7 is tightly connected to the output shaft of the motor 2. When the switch 4 is turned on, the output shaft of the motor 2 drives the inner shaft 7, which in turn drives the fixing rod 17, the cutting head 8, the filter screen 11, the cutting window 9, the crossbar 12 and the cutter 13 to rotate together. The cutting window 9 and the cutter 13 can then rotate and cut the tissue that is sucked into the cavity of the cutting head 8 by negative pressure.

[0013] It is worth noting that the above description is only a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. The present invention can also improve the materials and structure of the various components described above, or replace them with technical equivalents. Therefore, all equivalent structural changes made based on the description and illustrations of the present invention, or direct or indirect applications to other related technical fields, are similarly included within the scope of the present invention.

Claims

1. An endoscopic negative pressure rotary cutter, characterized in that: The device includes a handle, battery, motor, switch, connecting hole, square hole, and slot. The handle is a long, box-shaped structure, housing the battery and motor. A switch for controlling the motor is mounted on its surface. One end has the connecting hole, which is a blind hole, located near the motor. The motor output shaft extends into the connecting hole through its bottom, and the end of the output shaft has the square hole, which is also a blind hole. The slot is L-shaped and located on the inner wall of the connecting hole. The endoscopic negative pressure rotary cutter also includes an outer tube, a clasp, a branch tube, a cutting head, a fixing rod, an inner shaft, and a bushing. The outer tube is made of a hard material with lubricating properties. One end of the outer tube can be inserted into the connecting hole for connection. The clasp is located on the outer wall of this end for engaging and fixing with the slot. The branch tube is also located on the outer wall of the outer tube and communicates with it. The other end of the outer tube... The end sleeve is fitted onto the outside of the proximal end of the cutting head. The cutting head is a cylindrical metal tube that communicates with the outer tube cavity and is dynamically sealed. This dynamic seal is a contact seal achieved using a medical micro elastic sealing ring. The two can rotate relative to each other. The fixing rod is the same length as the inner diameter of the cutting head, and its two ends are respectively fixed to the inner walls on both sides of the proximal end of the cutting head. The inner shaft is a flexible metal shaft that passes through the inside of the outer tube and can rotate relative to it. One end of the inner shaft extends out of the outer tube cavity at the end where the outer tube is inserted into the connecting hole, and its diameter is thickened to form a square shaft head, which can be inserted into the square hole to achieve a drive connection. The gap between the inner shaft and the outer tube at this end is sealed at the outer tube opening by the bushing, which restricts the inner shaft from moving laterally or longitudinally. The other end of the inner shaft extends into the cutting head through the outer tube cavity and is fixed at the midpoint of the fixing rod.

2. The endoscopic negative pressure rotary cutter according to claim 1, characterized in that: further, the cutting head is also provided with a cutting window, a specimen compartment, a filter, a crossbar, and a cutter; the cutting window with a sharp cutting edge is provided on the side wall of the distal section of the cutting head; the cutting window has sharp cutting edges on both sides and the distal edge; the cutting edge adopts a blunt edge guide groove design, with a smooth rounded corner on the outer edge and a sharp cutting edge on the inner edge; inside the cutting head, in the cavity between the cutting window and the fixing rod, the specimen compartment and the filter are sequentially arranged; the specimen compartment is the... The cutting head section has a filter screen with a star-shaped support structure, fixed to the inner wall of the cutting head. It consists of a central hub and multiple ribs radiating outwards. Fan-shaped gaps are formed between adjacent ribs to allow fluid to pass through. The size of these gaps allows fluids such as blood and mucus to pass through while effectively blocking tissue fragments. The filter screen has a dynamic self-cleaning function as the cutting head rotates. The crossbar is the same length as the inner diameter of the cutting head, and its two ends are fixed to the inner walls on both sides of the distal port of the cutting head. The cutter is a long strip and is fixedly installed on the section between the midpoint and one end of the crossbar.

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