Rectal cancer incisal edge accurate positioning device and positioning method thereof

Abstract

The application provides a rectal cancer incisal edge accurate positioning device and a positioning method thereof, and belongs to the technical field of medical instruments. In order to solve the problems that the existing positioning device is difficult to realize, diffusion is easy to occur during micro-injection, and it is difficult to determine the distal incisal edge in the operation for the TaTME operation. The center tube is provided with a visible head at one end, the incisal edge positioning adjusting part is sleeved outside the center tube and can move up and down along the center tube, the outer wall of the center tube is provided with a scale line, a plurality of telescopic adjusting units are arranged in the side wall of the incisal edge positioning adjusting part, the telescopic adjusting units are in the retracted state in the initial state, and the telescopic adjusting units are in the extended state in the marking state. After the tumor position is confirmed, the distal incisal edge can be accurately positioned by adjusting the incisal edge positioning adjusting part and observing the scale of the center tube, the setting of the telescopic adjusting unit can enable the incisal edge position to be observed; the operation process of the device is simple, and the entire positioning time can be completed in only a few minutes; and the device can be used in the TME and TaTME operation modes.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a device and method for precise positioning of rectal cancer resection margins. Background Technology

[0002] In surgical procedures for gastrointestinal malignancies, it is often necessary to ensure that the superior and inferior resection margins are sufficiently far from the tumor to guarantee a negative pathological examination of the resection margins, thereby significantly reducing the probability of tumor recurrence at the anastomosis site. According to the "Guidelines for the Diagnosis and Treatment of Colorectal Cancer in China (2020 Edition)," the distance between the distal resection margin and the tumor is clearly defined for different stages of rectal cancer. However, during rectal cancer surgery, it is necessary to locate the tumor resection margin. This requires laparoscopic resection of the rectal wall, but laparoscopic surgery has significant limitations. Most of the procedure relies on some laparoscopic instruments as reference points to roughly determine the distance, or simply on manual palpation to pinpoint the exact location. Therefore, currently, the determination of the distal resection margin position in laparoscopic surgery is vague and inaccurate.

[0003] An existing patent for a 3D positioning device for the rectum and anal canal (CN201822012594.4) requires a puncture needle to be inserted along a vertical puncture channel into the puncture hole. However, the puncture needle is affected by the elastic deformation of the material, making it difficult to meet small-range vertical turning requirements. Furthermore, the operation is time-consuming due to the need to puncture each puncture hole individually. Additionally, during micro-injection, if the injection dose is too large, it can easily cause diffusion, making it difficult to accurately locate the positioning position. An existing patent for a laser trans-intestinal wall locator and a method for locating low rectal tumors (CN201810125502.5) is only applicable to laparoscopic total mesorectal excision (TME). Marking and excision are performed after the other parts are removed. For TaTME (transanal total mesorectal excision for rectal cancer), which is more difficult and risky but has better surgical outcomes, the resection margin needs to be determined before other operations are performed, making it difficult to determine the distal resection margin during the operation. Summary of the Invention

[0004] The technical problem to be solved by this invention is:

[0005] To address the challenges of existing positioning devices, such as difficulty in achieving precise positioning, the risk of diffusion during micro-injection, and the difficulty in determining the distal resection margin during TaTME procedures.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] This invention provides a device for precise positioning of resection margins in rectal cancer. The positioning device includes a visual head and a main body. The main body has a visual head at one end and includes a central tube and a resection margin positioning adjustment component that is connected to the central tube. The resection margin positioning adjustment component can slide up and down along the central tube. The visual head is used to house an image acquisition device that extends from the central tube to the visual head. The outer wall of the central tube has graduations. The side wall of the resection margin positioning adjustment component has several telescopic channels. One end of the telescopic channel is open on the end face opposite to the visual head, and the other end of the telescopic channel is open on the outer wall of the resection margin positioning adjustment component. The opening on the outer wall is a marking port. Each telescopic channel has a telescopic adjustment unit. In the initial state, all telescopic adjustment units are in the retracted state; in the marking state, all telescopic adjustment units are extended out of the marking port.

[0008] Furthermore, the central tube has a frustum at one end near the visible head, and a number of sliders are provided at the lower edge of the frustum. A number of slider limiting grooves are opened on the surface of the side wall of the cutting edge positioning adjustment component, or a number of slider limiting cavities are opened in the side wall of the cutting edge positioning adjustment component. The position of the slider matches the position of the slider limiting groove or slider limiting cavity. Each slider is set in the corresponding slider limiting groove or slider limiting cavity and can slide along the slider limiting groove or slider limiting cavity.

[0009] Furthermore, each marking port is located between two adjacent slider limiting grooves or between the outer walls of the slider limiting cavity.

[0010] Furthermore, the telescopic adjustment unit includes a telescopic block with a marker, a spring, an adjustment rod, and an adjustment knob. The telescopic channel is an inverted L-shaped channel, comprising a horizontal channel perpendicular to the central tube and a vertical channel parallel to the central tube. The telescopic block is located in the horizontal channel, and the adjustment rod is located in the vertical channel. The telescopic block and the adjustment rod are in contact, and the contact portions are both at matching inclined surfaces. The marker on the telescopic block corresponds to the position of the marking opening. The marker is connected to the inner wall of the marking opening in the telescopic channel by a spring. One end of the inner wall of the cutting edge positioning adjustment component extends out of the lower end face of the cutting edge positioning adjustment component. The tubular structure extending out of the lower end face of the cutting edge positioning adjustment component is a knob adjustment tube. The adjustment knob is sleeved on the knob adjustment tube and connected by a thread. The ends of several adjustment rods are in contact with the upper end face of the adjustment knob. In the initial state, the telescopic block is located in the telescopic channel. In the marked state, rotating the adjustment knob pushes the adjustment rod, thereby pushing the marker on the telescopic block out of the marking opening. At this time, the spring is in a compressed state.

[0011] Furthermore, the marker is a positioning rod with a hemispherical end, or the marker is a marking needle. When the marker is a marking needle, the marking needle is used to store the marker and inject the marker into the intestinal wall for marking through capillary action.

[0012] Furthermore, the telescopic channel is an inverted L-shaped channel, including a horizontal channel perpendicular to the central tube and a vertical channel parallel to the central tube. The telescopic adjustment unit includes a positioning push rod, which is located inside the horizontal channel. The end of the positioning push rod is a circular push plate that matches the shape of the horizontal channel. It is connected to the vertical channels of several telescopic channels through a blow-suction device. In the initial state, the positioning push rod is located inside the horizontal channel; in the marking state, the positioning push rod is pushed out of the marking port by the blow-suction device.

[0013] Furthermore, the visible head is flush with the outside of the cutting edge positioning adjustment member.

[0014] Furthermore, the scale increases sequentially in the opposite direction to the visible head.

[0015] Furthermore, the visible head is a transparent visible head, and an annular image acquisition device placement groove is formed on the inner wall of the visible head, so that the image acquisition device can be inserted into the annular image acquisition device placement groove after passing through the central tube, and the image acquisition device can rotate along the annular image acquisition device placement groove.

[0016] A positioning method for a precise positioning device for rectal cancer resection margins involves inserting the positioning device into the patient's anal canal, rotating and advancing it to locate the tumor lesion. When the image acquisition device in the visual head aligns with the lower distal margin of the tumor, advancement is stopped. The lower end of the image acquisition device is kept aligned with the lower distal margin of the tumor. After confirmation, the resection margin positioning adjustment component is slidably adjusted. At the resection margin position, the telescopic adjustment unit is extended, and the raised marker points around the rectal wall can be observed through the laparoscope. After marking the marker points, the operation is reversed to retract the markers into the resection margin positioning adjustment component, thus completing the positioning process.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention discloses a device for precise positioning of rectal cancer resection margins. A visual head is provided at one end of a central tube. A resection margin positioning adjustment component is sleeved outside the central tube and can move up and down along the central tube. The outer wall of the central tube is provided with scale lines. Several telescopic adjustment units are provided inside the side wall of the resection margin positioning adjustment component. In the initial state, the telescopic adjustment units are in the retracted state; in the marked state, the telescopic adjustment units are in the extended state for positioning the intestinal wall.

[0019] During the surgery, the positioning device can be implanted in the rectum. The size and location of the tumor can be observed in the visual head through the image acquisition device. After confirmation, the position of the cutting edge positioning adjustment component can be adjusted. At this time, the movement distance of the cutting edge positioning adjustment component can be obtained according to the scale line. The movement distance is adjusted according to the size of the tumor. When the cutting edge is in the position, the telescopic adjustment unit is in the extended state. The marking status of the intestinal wall can be observed through the laparoscopy, which improves the accuracy of the distal cutting edge.

[0020] The central tube is equipped with graduations, which can accurately determine the movement distance of the cutting edge positioning adjustment device to avoid the intestinal segment being removed too long or too short. If it is too long, it will affect postoperative recovery; if it is too short, it will lead to incomplete tumor resection, metastasis, or recurrence.

[0021] The device is easy to operate, and the entire positioning process can be completed in just a few minutes; moreover, the device can be used in both TME and TaTME procedures. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a device for precise positioning of rectal cancer resection margins according to an embodiment of the present invention. Figure 1 ;

[0023] Figure 2 This is a three-dimensional structural diagram of a device for precise positioning of rectal cancer resection margins according to an embodiment of the present invention. Figure 2 ;

[0024] Figure 3 This is a three-dimensional structural diagram of a device for precise positioning of rectal cancer resection margins according to an embodiment of the present invention. Figure 3 ;

[0025] Figure 4 This is a top view of the cutting edge positioning adjustment component in an embodiment of the present invention;

[0026] Figure 5 This is a cross-sectional view of a device for precise positioning of rectal cancer resection margins according to an embodiment of the present invention. Figure 1 ;

[0027] Figure 6 for Figure 5 A magnified view of the initial state of part A in the middle section;

[0028] Figure 7 for Figure 5 Enlarged view of the marked state in section A;

[0029] Figure 8 This is an enlarged view of the marked state in an embodiment of the present invention;

[0030] Figure 9 This is a cross-sectional view of a device for precise positioning of rectal cancer resection margins according to an embodiment of the present invention. Figure 2 .

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Visual head; 2. Image acquisition device; 3. Slider; 4. Edge positioning adjustment component; 5. Marking port; 6. Adjusting rod; 7. Knob adjustment tube; 8. Adjusting knob; 9. Center tube; 10. Slider limiting groove; 13. Telescopic channel; 14. Telescopic block; 15. Spring; 16. Marking needle; 17. Positioning push rod; 18. Blowing and suction device; 101. Image acquisition device placement slot; 801. Adjusting rod placement slot; 1301. Horizontal channel; 1302. Vertical channel; 1401. Positioning rod; 1402. Spring mounting slot; 1403. Sloping structure. Detailed Implementation

[0033] In the description of this invention, it should be noted that the terms used in the various embodiments, such as "upper," "lower," "front," "rear," "left," and "right," which indicate orientation, are only used to simplify the description of the positional relationships based on the accompanying drawings and do not mean that the components and devices referred to must be operated in accordance with the specific orientations and defined operations, methods, and structures in the specification. Such directional terms do not constitute a limitation of this invention.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] Specific Implementation Plan 1: Combining Figures 1 to 9 As shown, the present invention provides a device for precise positioning of resection margins in rectal cancer. The positioning device includes a visual head 1 and a device body. The visual head 1 is provided at one end of the device body. The device body includes a central tube 9 and a resection margin positioning adjustment member 4 connected to the central tube 9. The resection margin positioning adjustment member 4 can slide up and down along the central tube 9. The visual head 1 is used to place an image acquisition device 2 that extends from the central tube 9 to the visual head 1. The outer wall of the central tube 9 is provided with a scale. The side wall of the resection margin positioning adjustment member 4 is provided with a plurality of telescopic channels 13. One end of the telescopic channel 13 is open at the end face opposite to the visual head 1 of the resection margin positioning adjustment member 4, and the other end of the telescopic channel 13 is open at the outer wall of the resection margin positioning adjustment member 4. The opening of the outer wall is a marking port 5. Each telescopic channel 13 is provided with a telescopic adjustment unit. In the initial state, the telescopic adjustment units are all in the retracted state; in the marking state, the telescopic adjustment units are all extended out of the marking port 5.

[0036] Positioning Method: During TME surgery, the positioning device can be inserted into the rectum. The device is then inserted into the patient's anal canal and rotated forward to locate the tumor lesion. Advancement is stopped when the image acquisition device 2 in the visual head 1 aligns with the distal lower edge of the tumor. The lower end of the image acquisition device 2 remains aligned with the distal lower edge of the tumor. After confirmation, the cutting edge positioning adjustment component 4 is slidably adjusted. The movement distance of the adjustment component 4 can be determined according to the scale. This distance is adjusted based on the required distance between the lower edge of the tumor and the distal cutting edge, and is determined by the physician based on the patient's condition. At the cutting edge position, the telescopic adjustment unit is extended. Through the laparoscope, raised markers around the intestinal wall can be observed. After marking these points, the operation is reversed to retract the markers into the cutting edge positioning adjustment component 4, completing the positioning process.

[0037] The central tube 9 is equipped with a scale, which can accurately determine the movement distance of the cutting edge positioning adjustment component 4, thereby accurately measuring the distance from the lowest point of the distal lower edge of the tumor to the distal cutting edge.

[0038] Preferably, the image acquisition device 2 is a camera.

[0039] Specific Implementation Plan Two: Combining Figures 1 to 9 As shown, the central tube 9 has a frustum at one end near the visible head 1, and several sliders 3 are provided at the lower edge of the frustum. Several slider limiting grooves 10 are formed on the surface of the sidewall of the edge positioning adjustment component 4, or several slider limiting cavities are formed inside the sidewall of the edge positioning adjustment component 4. The position of the slider 3 matches the position of the slider limiting groove 10 or slider limiting cavity. Each slider 3 is set in a corresponding slider limiting groove 10 or slider limiting cavity and can slide along the slider limiting groove 10 or slider limiting cavity. Other combinations and connections in this embodiment are the same as in specific embodiment one.

[0040] Preferably, each marking port 5 is located between two adjacent slider limiting grooves 10 or between the outer walls of the slider limiting cavity, so as to avoid the slider and the marking part from conflicting.

[0041] Preferably, the marking ports 5 are arranged in a ring and evenly on the outer wall of the main body of the device.

[0042] Specific Implementation Plan Three: Combining Figures 1 to 9As shown, the telescopic adjustment unit includes a telescopic block 14 with a marker, a spring 15, an adjustment rod 6, and an adjustment knob 8. The telescopic channel 13 is an inverted L-shaped channel, including a horizontal channel 1301 perpendicular to the central tube 9 and a vertical channel 1302 parallel to the central tube 9. The telescopic block 14 is located in the horizontal channel 1301, and the adjustment rod 6 is located in the vertical channel 1302. The telescopic block 14 and the adjustment rod 6 contact each other, and the contact parts are both matched with inclined surface structures 1403. The marker on the telescopic block 14 corresponds to the position of the marking opening 5. The marker is provided with a spring mounting groove 1402, and the spring mounting groove 1402 is connected to the inner wall of the marking opening 5 in the telescopic channel 13 by the spring 15. The diameter of the marking opening 5 is smaller than the inner diameter of the transverse channel 1301. One end of the inner wall of the cutting edge positioning adjustment member 4 extends out of the lower end face of the cutting edge positioning adjustment member 4. The tubular structure extending out of the lower end face of the cutting edge positioning adjustment member 4 is a knob adjustment tube 7. The adjustment knob 8 is sleeved on the knob adjustment tube 7 and connected by threads. The ends of several adjustment rods 6 are in contact with the upper end face of the adjustment knob 8. In the initial state, the telescopic block 14 is located in the telescopic channel 13. In the marking state, by rotating the adjustment knob 8, the adjustment rods 6 are pushed, which in turn pushes the marking member on the telescopic block 14 out of the marking opening 5. At this time, the spring 15 is in a compressed state. When it is necessary to retract, the adjustment knob 8 is rotated in the opposite direction, and the marking member retracts into the transverse channel 1301 under the action of the spring 15. Other combinations and connection relationships in this embodiment are the same as in specific embodiment two.

[0043] Preferably, the slider 3 is interference-fitted with the slider limiting groove 10 or the slider limiting cavity. When searching for the distal cutting edge, the fixed central tube 9 remains stationary, and the adjustment knob 8 is pushed or pulled out, thereby driving the cutting edge positioning adjustment component 4 to move. Due to the wrapping of the intestinal wall and the interference-fitted connection between the slider 3 and the slider limiting groove 10 or the slider limiting cavity, the slider 3 will not move relative to the slider limiting groove 10 or the slider limiting cavity after the positioning device is released.

[0044] Preferably, the upper end face of the adjusting knob 8 is provided with an adjusting rod placement groove 801, the upper end face of the adjusting rod placement groove 801 is provided with a limiting boss, the end of the adjusting rod 6 is provided with a limiting block, the adjusting rod 6 is located in the adjusting rod placement groove 801 and is engaged with the limiting boss below by the limiting block, so that the adjusting rod 6 can move up and down when the adjusting knob 8 is rotated, and the adjusting rod 6 can rotate in the adjusting rod placement groove 801.

[0045] Preferably, the marking element is a positioning rod 1401 with a hemispherical end or a marking needle 16. When the marking element is a positioning rod 1401, the hemispherical end has a smooth curved surface to avoid damage to the intestinal wall. When the marking element is a marking needle 16, the marking needle 16 is used to store the marking material and injects the marking material into the intestinal wall for marking through capillary action.

[0046] When the marker is the positioning rod 1401, the positioning rod 1401 protrudes and squeezes the intestinal wall, and the marking point can be clearly observed under laparoscopy. The marking can be done during the operation. When the marker is the marking needle 16, the intestinal wall needs to be stained with the dye in the marking needle 16 before the operation. During the operation, the circular staining mark is observed through laparoscopy to determine the position of the cutting edge.

[0047] Specific Implementation Plan Four: Combining Figures 1 to 9 As shown, the telescopic channel 13 is an inverted L-shaped channel. The telescopic adjustment unit is located within the horizontal channel 1301 of the inverted L-shaped channel, including a positioning push rod 17. The positioning push rod 17 is located within the horizontal channel 1301 of the inverted L-shaped channel. The end of the positioning push rod 17 is a circular push plate that matches the shape of the horizontal channel 1301. It is connected to the vertical channels 1302 of several telescopic channels 13 via a blow-suction device 18. In the initial state, the positioning push rod 17 is located within the horizontal channel 1301. In the marked state, the blow-suction device 18 pushes the positioning push rod 17 out of the marked opening 5. Due to the circular push plate, the gap between the positioning push rod and the inner wall of the horizontal channel 1301 is reduced, facilitating blow-suction. Other combinations and connections in this embodiment are the same as in specific embodiment three.

[0048] Preferably, the blowing and suction device 18 is an air blowing and suction device that can realize the functions of extraction and blowing. The air blowing and suction device is tightly connected to the channel opening of the telescopic channel 13 to facilitate extraction.

[0049] Preferably, the visible head 1 is flush with the outside of the cutting edge positioning adjustment member 4.

[0050] Preferably, the scale increases sequentially in the opposite direction to the visible head 1. The precise sliding distance of the device body, i.e., the distance from the lower edge of the tumor to the marked distal cutting edge, is obtained by reading the scale.

[0051] Specific Implementation Plan Five: Combining Figures 1 to 9 As shown, the visual head 1 is a transparent visual head. An annular image acquisition device placement groove 101 is formed on the inner wall of the visual head 1. The image acquisition device 2, after passing through the central tube 9, is snapped into the annular image acquisition device placement groove 101. The image acquisition device 2 can rotate along the annular image acquisition device placement groove 101, and the lower edge of the annular image acquisition device placement groove 101 can be used as the starting point of the lower edge of the tumor, resulting in more accurate readings. Other combinations and connections in this embodiment are the same as in specific embodiments three or four.

[0052] Preferably, a ring light is provided below the ring image acquisition device placement slot 101, which is used only for illumination. It provides a light source when the camera acquires images in real time.

[0053] When performing the TaTME procedure, the marker is a needle. After the patient is in the lithotomy position, the positioning device is inserted into the patient's anal canal and rotated to advance it to find the location of the tumor lesion. When the lower edge of the ring image acquisition device placement slot 101 is aligned with the lower edge of the distal tumor, the advancement is stopped and the lower edge of the ring image acquisition device placement slot 101 is kept aligned with the lower edge of the distal tumor.

[0054] Slide the cutting edge positioning adjustment piece 4 according to the required distance from the distal cutting edge to the tumor edge, and fix the cutting edge positioning adjustment piece 4 after adjusting it to the corresponding scale.

[0055] By rotating the adjustment knob 8, the marker extends and the needle on the marker pierces the rectal wall. After standing for 5 minutes, the staining agent on the needle will stain the surrounding capillary tissue, and a ring-shaped staining point will be formed on the rectal wall at a precise distance from the edge of the tumor. By rotating the adjustment knob 8 in the opposite direction, the marker retracts into the cutting edge positioning adjustment part 4.

[0056] After completing the positioning, insert a single-port trocar to begin suturing the intestinal wall above the marked point, and then begin freeing the rectum from the marked point.

[0057] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A device for precise positioning of resection margins in rectal cancer, characterized in that: The positioning device includes a visual head (1) and a device body. The device body has a visual head (1) at one end. The device body includes a central tube (9) and a cutting edge positioning adjustment member (4) connected to the central tube (9). The cutting edge positioning adjustment member (4) can slide up and down along the central tube (9). The visual head (1) is used to place an image acquisition device (2) that extends from the central tube (9) to the visual head (1). The outer wall of the central tube (9) is marked. The side wall of the cutting edge positioning adjustment member (4) is provided with several telescopic channels (13). One end of the telescopic channel (13) is open at the end face opposite to the cutting edge positioning adjustment member (4) and the visual head (1). The other end of the telescopic channel (13) is open at the outer wall of the cutting edge positioning adjustment member (4). The opening on the outer wall is a marking port (5). Each telescopic channel (13) is provided with a telescopic adjustment unit. In the initial state, the telescopic adjustment units are all in the retracted state. In the marking state, the telescopic adjustment units are all extended out of the marking port (5). Insert the positioning device into the patient's anal canal, rotate and advance it to find the location of the tumor lesion. When the image acquisition device (2) in the visual head (1) is aligned with the lower edge of the tumor, stop advancing and keep the lower end of the image acquisition device (2) aligned with the lower edge of the tumor. After confirming that it is aligned, slide and adjust the cutting edge positioning adjustment piece (4). When the cutting edge is in the position, make the telescopic adjustment unit extend. The protruding markers around the intestinal wall can be observed through the laparoscope. After marking the markers, reverse the operation to retract the markers into the cutting edge positioning adjustment piece (4) to complete the positioning work.

2. The device for precise positioning of rectal cancer resection margins according to claim 1, characterized in that: The central tube (9) has a frustum at one end near the visible head (1), and a number of sliders (3) are provided at the lower edge of the frustum. A number of slider limiting grooves (10) are opened on the surface of the side wall of the edge positioning adjustment component (4), or a number of slider limiting cavities are opened in the side wall of the edge positioning adjustment component (4). The position of the slider (3) matches the position of the slider limiting groove (10) or the slider limiting cavity. Each slider (3) is set in the corresponding slider limiting groove (10) or slider limiting cavity and can slide along the slider limiting groove (10) or slider limiting cavity.

3. The device for precise positioning of rectal cancer resection margins according to claim 2, characterized in that: Each marking port (5) is located between two adjacent slider limiting grooves (10) or between the outer walls of the slider limiting cavity.

4. The device for precise positioning of rectal cancer resection margins according to claim 3, characterized in that: The telescopic adjustment unit includes a telescopic block (14) with a marker, a spring (15), an adjustment rod (6), and an adjustment knob (8). The telescopic channel (13) is an inverted L-shaped channel, which includes a horizontal channel (1301) perpendicular to the central tube (9) and a vertical channel (1302) parallel to the central tube (9). The telescopic block (14) is located in the horizontal channel (1301), and the adjustment rod (6) is located in the vertical channel (1302). The telescopic block (14) and the adjustment rod (6) are in contact, and the contact parts are both at matching inclined surfaces (1403). The marker on the telescopic block (14) corresponds to the position of the marking port (5). The marker and the telescopic channel (14) are aligned. 3) The inner wall of the inner marking port (5) is connected by a spring (15). One end of the inner wall of the cutting edge positioning adjustment member (4) extends out of the lower end face of the cutting edge positioning adjustment member (4). The tubular structure extending out of the lower end face of the cutting edge positioning adjustment member (4) is a knob adjustment tube (7). The adjustment knob (8) is sleeved on the knob adjustment tube (7) and connected by a thread. The ends of several adjustment rods (6) are in contact with the upper end face of the adjustment knob (8). In the initial state, the telescopic block (14) is located in the telescopic channel (13). In the marking state, by rotating the adjustment knob (8), the adjustment rod (6) is pushed, which in turn pushes the marking member on the telescopic block (14) out of the marking port (5). At this time, the spring (15) is in a compressed state.

5. The device for precise positioning of rectal cancer resection margins according to claim 4, characterized in that: The marker is a positioning rod (1401) with a hemispherical end, or the marker is a marking needle (16). When the marker is a marking needle (16), the marking needle (16) is used to store the marker and inject the marker into the intestinal wall for marking through capillary action.

6. The device for precise positioning of rectal cancer resection margins according to claim 3, characterized in that: The telescopic channel (13) is an inverted L-shaped channel, including a horizontal channel (1301) perpendicular to the central tube (9) and a vertical channel (1302) parallel to the central tube (9). The telescopic adjustment unit includes a positioning push rod (17), which is located in the horizontal channel (1301). The end of the positioning push rod (17) is a circular push plate that matches the shape of the horizontal channel (1301). It is connected to the vertical channels (1302) of several telescopic channels (13) through a blow-suction device (18). In the initial state, the positioning push rod (17) is located in the horizontal channel (1301). In the marking state, the positioning push rod (17) is pushed out of the marking port (5) by the blow-suction device (18).

7. A device for precise positioning of rectal cancer resection margins according to claim 4, 5, or 6, characterized in that: The visible head (1) is flush with the outside of the cutting edge positioning adjustment member (4).

8. The device for precise positioning of rectal cancer resection margins according to claim 7, characterized in that: The scale increases sequentially in the opposite direction to the visible head (1).

9. The device for precise positioning of rectal cancer resection margins according to claim 8, characterized in that: The visible head (1) is a transparent visible head. The inner wall of the visible head (1) is provided with an annular image acquisition device placement groove (101) for the image acquisition device (2) to be inserted into the annular image acquisition device placement groove (101) after passing through the central tube (9), and the image acquisition device (2) can rotate along the annular image acquisition device placement groove (101).

Images