Endoscope magnetic positioning clamp for positioning tumor mark in laparoscopic surgery

Abstract

The application discloses a magnetic positioning clamp for positioning tumor marks in laparoscopic surgery, which comprises a clamp body, the outer contour of which is matched with the channel of an endoscope, and part or all of which is made of magnetic material; a clamp head arranged in the clamp body and having a clamping opening at one end, the end of the clamp head with the clamping opening being exposed outside the clamp body; and a pull cable connected to the clamp head in a detachable manner, and the opening and closing of the clamping opening are associated with the control of the pull cable when the pull cable is connected to the clamp head, so that the pull cable can control the opening and closing of the clamping opening of the clamp head. The magnetic positioning clamp for positioning tumor marks in laparoscopic surgery can mark and position the tumor position by using the channel of an endoscope during endoscopy, and the position of the magnetic positioning clamp can be recognized by using the magnetic attraction characteristic outside the intestinal wall of the abdominal cavity of a patient by using any existing iron surgical instrument.

Description

Technical Field

[0001] This invention relates to the technical field of surgical aids used in laparoscopic surgery, specifically an endoscopic magnetic positioning clip for tumor marking and localization in laparoscopic surgery. Background Technology

[0002] Currently, gastrointestinal surgeons have found in clinical practice that the anatomical structure of the gastrointestinal tract differs from the endoscopic landmarks, making it difficult to locate small gastrointestinal lesions during actual surgery. Common methods for locating small gastrointestinal tumors in laparoscopic surgery include submucosal staining and intraoperative gastroscopy / colonoscopy. Submucosal staining has the advantage of easy identification of the stained area, but its disadvantages include more complications, including greater operational difficulty, focal peritonitis, and hematoma or abscess formation at the injection site. Intraoperative gastroscopy / colonoscopy offers the advantage of more accurate localization when combined with laparoscopic positioning, but its disadvantages include cumbersome operation, time-consuming and labor-intensive procedures for medical staff, and gastrointestinal distension after intraoperative gastroscopy / colonoscopy, which affects subsequent surgical procedures and increases the difficulty of the operation.

[0003] Endoscopic submucosal dissection (ESD) can be performed for colorectal carcinoma in situ. For small colorectal tumors that cannot be removed by ESD, patients can undergo laparoscopic resection of the intestinal segment and corresponding mesentery. However, early-stage colorectal tumors are often small, making it extremely difficult to locate the tumor using laparoscopic instruments during laparoscopic resection.

[0004] Therefore, there is a strong demand in existing laparoscopic surgeries for a device that can accurately mark and locate tiny tumors in the gastrointestinal tract without the use of dye injections or additional intraoperative procedures, is convenient and quick to implement, cost-effective, and causes minimal trauma and complications for patients. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art: to provide an endoscopic magnetic positioning clip for tumor marking and localization in laparoscopic surgery, which can mark and locate the tumor position using the endoscopic forceps during endoscopic examination, and can identify the position of the magnetic positioning clip from inside the patient's abdominal cavity using any existing iron surgical instrument by utilizing the magnetic attraction property.

[0006] Therefore, one object of the present invention is to provide an endoscopic magnetic positioning clip for tumor marking and localization in laparoscopic surgery, comprising a clip body whose outer contour is configured to match the forceps channel of the endoscope, and is partially or wholly made of magnetic material.

[0007] A chuck is arranged inside the fixture body and has an opening and closing gripping port at one end, with the end of the chuck with the gripping port protruding outside the fixture body.

[0008] A cable is connected at one end to a clamp in a detachable manner, and the opening and closing action of the clamping opening when the cable is connected to the clamp is associated with the control action of the cable, so that the cable can control the clamping opening of the clamp to open or close.

[0009] Taking intestinal magnetic positioning as an example, the aforementioned magnetic positioning clamp can be inserted directly into the patient's intestine under endoscopic visualization through the clamping channel of the endoscope. The clamp body, along with the clamp head, is then aligned with the tumor location on the intestinal wall. The clamp head is positioned to mark the location of the tumor tissue on the intestinal wall using a controlled pull cable. Finally, the clamp body and clamp head are released via the pull cable. If multiple magnetic positioning clamps are used, they are arranged around the lesion area. Because the clamp body is magnetic, the surgeon can insert any existing iron surgical instrument into the patient's abdominal cavity through an opening in the abdominal wall during laparoscopic surgery. The instrument moves along the intestine for exploration. When the iron surgical instrument approaches the magnetic positioning clamp, the surgeon can sense the magnetic attraction on the instrument, allowing for accurate removal of the marked tumor area.

[0010] Preferably, the clamp body includes a housing whose outer contour matches the endoscope clamp channel, a base block is provided inside the housing, the base block is slidably engaged with the housing, and part or all of the base block is made of magnetic material, one end of the cable extends into the housing through the rear end of the housing and is connected to the base block in a detachable manner, for driving the base block to move axially along the housing, and the opening and closing action of the clamp is associated with the axial movement of the base block.

[0011] In the above scheme, the existence of the base block connects the cable to the base block, and then connects the base block to the clamp. Therefore, the cable and the base block only need to have a release function, while the base block and the clamp only need to realize that the opening and closing action of the clamp is related to the extension and retraction action of the base block.

[0012] Preferably, the base block is made of a permanent magnet material, and the outer shell is made of a non-magnetic material. The entire base block is magnetic, while the outer shell is not magnetic. Therefore, the magnetism of the base block will not affect the relative movement between the base block and the outer shell. At the same time, the base block made of permanent magnet material can have stable and reliable magnetism over a long period of time.

[0013] Preferably, the chuck includes two clamping arms formed by bending a strip-shaped metal substrate along the middle position, the rear ends of the two clamping arms connected together form a groove, a horizontally arranged pin is provided inside the housing near the front end of the housing, the groove on the chuck is fitted over the pin, and the front ends of the two clamping arms extend to the outside of the housing, forming a clamping opening between the front ends of the two clamping arms.

[0014] The front end of the base block has an abutment portion for contacting the chuck. This abutment portion has a groove corresponding to the position of the pin. The abutment portion abuts against the clamping arms, driving the two clamping arms to move relative to or away from each other, thus opening or closing the clamping opening. The chuck adopts a V-shaped self-propelled structure; therefore, the abutment portion at the lower end of the base block can drive the chuck to close or open, thus linking the opening and closing action of the chuck with the axial movement of the base block.

[0015] Preferably, the front end face of the abutment portion is connected to the inner wall of the slot via a rounded surface. This rounded surface makes the swinging of the clamping arm on the chuck smoother during the downward movement of the base block.

[0016] Preferably, the arcuate surface and the inner wall of the slot are connected by a beveled transition. The bevel is configured such that when the outer side of the clamping arm is in contact with the bevel, the projection of the clamping arm on the cross-section of the outer shell is located inside the outer shell. The bevel allows the clamping arm to have an intermediate position, that is, when the clamping arm and the bevel are in contact, the clamping arm can be retracted to allow passage through the endoscopic forceps channel. Therefore, a larger clamp can pass through the forceps channel into the patient's intestine, and the larger clamp can hold more firmly, reducing the risk of accidental clamp dislodgement.

[0017] Preferably, the inner wall of the housing is provided with a limiting member and at least one positioning member. The limiting member is located near the front end face of the housing and is used to limit the forward axial movement of the base block. The positioning member is arranged on the inner side of the limiting member away from the front end face of the housing. When the base block moves forward axially and abuts against the limiting member, the positioning member is located between the outer wall of the base block and the inner wall of the housing, and is used to limit the backward axial movement of the base block. The limiting member limits the downward position of the base block, while the positioning member keeps the base block in its current position after it abuts against the limiting member, avoiding the risk that the base block will move upward on its own after the cable releases the clamp body, thus preventing the clamp from accidentally disengaging.

[0018] Preferably, the base block has a central hole at the position corresponding to the clamp, the central hole extends vertically through the base block, and a core block is embedded in the central hole; the cable is detachably connected to the core block.

[0019] The core block and the base block are configured as follows:

[0020] When the base block moves away from the positioning component, the bonding force between the core block and the base block can drive the core block and the base block to move synchronously.

[0021] When the base block descends to the position between the outer wall of the base block and the inner wall of the outer shell, the tension of the cable acting on the core block can overcome the bonding force between the core block and the base block, so that the core block moves upward relative to the base block along the central hole.

[0022] On the one hand, the binding force between the core block and the base block enables the core block to move synchronously with the base block when it moves along the axial direction. On the other hand, the downward movement of the base block causes the positioning component to be placed between the base block and the outer shell, thus limiting the base block. When the cable pulls the core block upward, the tension breaks through the binding force, causing the core block to move upward relative to the base block. At this time, the base block remains at the front end of the outer shell, while the core block drives the chuck to move upward, ultimately shortening the part of the chuck exposed outside the outer shell, allowing the base block to get closer to the intestinal wall tissue held by the front end of the chuck.

[0023] Preferably, the chuck has a protrusion on the outer side away from the groove, and the core block has a slot that matches the protrusion. When the core block moves the base block downwards to abut against the limiting member, the protrusion inserts into the slot and fits tightly with the slot. Through the insertion and fixing between the protrusion and the slot, the chuck can be moved upwards synchronously during the upward withdrawal of the core block, thus making the connection between the core block and the chuck more secure.

[0024] Preferably, the cable is a slender traction wire, and the rear end of the core block is provided with multiple claws, each claw closing to form a mounting hole that matches the traction wire, into which the traction wire is inserted;

[0025] When the rear end of the core block is placed in the central hole of the base block, the inner wall of the central hole drives each claw to move inward and tighten the traction wire;

[0026] When the mandrel moves upward so that its rear end is exposed outside the central hole, the chuck moves outward under its own elastic restoring force, thereby disengaging the chuck from the traction wire. If other existing general release structures are used between the cable and the mandrel, such as the release structures on existing titanium clips or hemostatic clips, the added release structure itself will be more complex, and the cable will also need to cooperate with the additional control of the release structure, thus making the cable structure more complex as well. However, by designing the rear end of the mandrel, the chuck clamps the traction wire, and once the rear end of the mandrel is freed from the constraint of the central hole, it can automatically disengage from the traction wire. The structure is simple and reliable, and the disengagement of the traction wire from the mandrel can be achieved without additional control actions.

[0027] The above-mentioned technical solution has the following advantages or beneficial effects: First, the magnetic positioning clip can accurately clamp onto the intestinal wall tissue in the tumor area under endoscopic visualization. After the cable and clip are released and detached, the clip and the main body of the clamp can remain in the patient's intestine for marking. In subsequent laparoscopic surgery, the surgeon can find the magnetic positioning clip by simply probing along the intestinal wall with iron surgical instruments inserted into the patient's abdominal cavity, where there is mutual magnetic attraction. Therefore, there is no need to use chemical staining agents to stain the intestinal wall or intraoperative gastroscopy for positioning and confirmation. Second, the cable can be connected to the base block by using a method where the base block can move axially within the outer shell. Therefore, only the release function needs to be considered between the cable and the base block. The opening and closing of the clamp is controlled by the axial movement of the base block, making the overall structure more reliable. Furthermore, the base block has a beveled surface at the contact point. This bevel design allows the longer clamp arm to enter the endoscopic channel when the endoscope probes the patient's intestinal wall. At the same time, the surgeon can intuitively judge the state of the clamping opening on the clamp simply by sensing the change in resistance on the base block. Finally, through the cooperation of the positioning element and the core block, after the clamp is clamped onto the patient's intestinal wall tissue, the base block can be closer to the front end of the clamp, that is, the magnetic base block is closer to the patient's intestinal wall, ensuring that the iron surgical instruments are more easily attracted to the base block magnetically during the exploration of the intestinal wall from the outside.

[0028] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the endoscopic magnetic positioning clip for tumor marking and localization in laparoscopic surgery according to the present invention.

[0030] Figure 2 for Figure 1 A frontal view of the magnetic positioning clip for the endoscope.

[0031] Figure 3 for Figure 2 A cross-sectional view along the "AA" direction when the chuck is in the open position.

[0032] Figure 4 for Figure 3 A magnified view of a portion of region "B".

[0033] Figure 5 for Figure 2 A cross-sectional view along the "AA" direction when the chuck is in a semi-open state.

[0034] Figure 6 for Figure 5 A magnified view of a portion of the "C" region.

[0035] Figure 7 for Figure 2 A cross-sectional view along the "AA" direction when the chuck is in the closed position.

[0036] Figure 8 for Figure 7 A magnified view of a portion of the "D" region.

[0037] Figure 9 for Figure 7 A schematic diagram of the structure in which the central cable drives the core block to move the clamp upward.

[0038] Figure 10 This is a schematic diagram of the internal structure of the clamp body when the chuck is in the closed state.

[0039] Figure 11 for Figure 10 A magnified view of the "E" region in the middle.

[0040] Figure 12 yes Figure 1 A schematic diagram of the explosive disassembly of the magnetic positioning clip for the endoscope.

[0041] Figure 13 This is a schematic diagram of a sample test where an external magnet is suspended on an existing endoscope titanium clip.

[0042] Figure 14 yes Figure 13 A schematic diagram showing the use of iron surgical instruments to explore the intestinal wall after titanium clips are placed on the patient's intestinal wall.

[0043] Among them, 100 is the clamp body; 200 is the chuck; and 300 is the cable.

[0044] 1. Outer shell; 2. Base block; 2.1. Abutting part; 2.2. Arc surface; 2.3. Bevel; 2.4. Center hole; 3. Pin; 4. Clamping arm; 5. Groove; 6. Protrusion; 7. Clamping opening; 8. Slot; 9. Limiting component; 10. Positioning component; 11. Core block; 11.1. Slot; 12. Claw; 13. Mounting hole. Detailed Implementation

[0045] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0046] An endoscopic magnetic positioning clip for tumor marking and localization in laparoscopic surgery according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0047] The term "endoscope" as used below refers to endoscopes used in endoscopic examinations, including but not limited to colonoscopes used for intestinal examinations and gastroscopes used for gastric examinations. Existing endoscopes generally have forceps channels to allow various endoscopic auxiliary instruments to pass through, such as snares and grasping forceps.

[0048] The magnetic materials described below are preferably strongly magnetic materials. Example 1

[0049] The present invention provides an endoscopic magnetic positioning clip for tumor marking and localization in laparoscopic surgery, as shown in the figure, which includes a clip body 100, a clamp head 200 and a cable 300;

[0050] The outer contour of the clamp body 100 is designed to match the clamp channel of the endoscope used in existing laparoscopic surgery, so that the clamp body 100 can enter the diseased area in the patient's body by means of the clamp channel of the endoscope. Part of the clamp body 100 is made of magnetic material or the entire clamp body 100 is made of magnetic material.

[0051] The chuck 200 is arranged inside the clamp body 100 and has an opening 7 at one end. The end of the chuck 200 with the opening 7 is exposed outside the clamp body 100, so that the chuck 200 has at least an open state with the opening 7 expanded and a clamping state with the opening 7 contracted and closed.

[0052] One end of the cable 300 extends through the rear end of the clamp body 100 into the location of the clamp 200 and is detachably connected to the clamp 200. When the cable 300 is connected to the clamp 200, the opening and closing action of the clamping port 7 is associated with the control action of the cable 300, allowing the cable 300 to control the opening or closing of the clamping port 7 of the clamp 200. In this embodiment, the opening and closing action of the clamping port 7 refers to the movement required for the clamping port 7 of the clamp 200 to switch between an open state and a clamping state; that is, the clamping port 7 switches from an open state to a clamping state or vice versa through its own opening and closing action. In this embodiment, when the clamp is in the endoscope channel, the other end of the cable 300 protrudes outside the channel opening of the endoscope handpiece.

[0053] Taking intestinal tumors as an example, in this embodiment, the clamp body 100, together with the clamp head 200 on the clamp body 100, is inserted into the patient's diseased area through the endoscope's channel. Then, a control action is applied by the end of the cable 300 located outside the channel opening, so that the clamp head 200 can synchronously open and close, clamping the clamp head 200 onto the patient's intestinal wall. Since the cable 300 and the clamp head 200 can be detached, the installation and positioning of a single magnetic positioning clamp can be completed simply by detaching the cable 300 from the clamp head 200. Similarly, when multiple magnetic positioning clamps are needed, all magnetic positioning clamps can be installed and positioned sequentially to delineate and mark the entire intestinal tumor location. Finally, during laparoscopic surgery, the surgeon can complete the marking and positioning of the patient's intestinal tumor area inside the patient's abdominal cavity and outside the intestine using only iron surgical instruments. Specifically, the surgeon inserts existing iron surgical instruments into the patient's abdominal cavity through an opening in the abdominal wall. By gently touching along the outer contour of the intestine, the surgeon can accurately locate the magnetic positioning clip that has been pre-clamped in the patient's intestine by the endoscope. Based on the position of the magnetic positioning clip, the lesion area can be precisely removed. Example 2

[0054] Based on the preferred embodiment 1 described above, the clamp body 100 includes a housing 1 whose outer contour matches the endoscope clamp channel. A base block 2 is provided inside the housing 1. The base block 2 is slidably engaged with the housing 1 and is partially or entirely made of magnetic material. One end of the cable 300 extends into the housing 1 through the rear end of the housing 1 and is connected to the base block 2 in a detachable manner, for driving the base block 2 to move along the axial direction of the housing 1. The opening and closing action of the clamp 200 is related to the axial movement of the base block 2.

[0055] Preferably, the outer shell 1 is a cylindrical structure, and both ends of the outer shell 1 along its own axial direction have openings, and the base block 2 is a cylindrical structure that matches the inner cavity of the outer shell 1.

[0056] Preferably, the base block 2 is made of permanent magnet material, and the outer shell 1 is made of non-magnetic material. Alternatively, the base block 2 may contain a magnetic block made of permanent magnet material, and the outer shell 1 may be made of non-magnetic material.

[0057] In this embodiment, since the housing 1 contains a base block 2, the cable 300 and the base block 2 only need to be connected and the cable 300 needs to be detached from the base block 2 when necessary. This type of release and detachment between the cable and the connected component is widely used in various hemostatic clips currently used in clinical practice, such as Anrui Medical Devices' disposable hemostatic clips and Boston Scientific's disposable hemostatic clips with pushers. This type of disposable endoscopic hemostatic clip with release function is a conventional product in the field of hemostatic clips, and this release structure will not be described in detail in this embodiment.

[0058] The opening and closing action of the clamp 200 can be controlled by the axial movement of the base block 2. In this embodiment, the base block 2 has at least two functions: First, it is magnetic, which facilitates the positioning of iron surgical instruments from outside the intestine to the base block 2 through magnetic attraction during subsequent laparoscopic surgery; Second, the axial movement of the base block 2 is related to the opening and closing action of the clamp 200. Specifically, when the base block 2 moves forward, the clamp 200 can close until it is in a clamping state, and when the base block 2 moves backward, the clamp 200 can open until it is in an open state. Example 3

[0059] Based on the preferred embodiment 200 described above, the chuck 200 includes two clamping arms 4 formed by bending a strip-shaped metal substrate along its middle position. The two clamping arms 4 are V-shaped when the chuck 200 is in the open state and U-shaped when in the clamping state. A groove 5 is formed at the connected rear ends of the two clamping arms 4. A horizontally arranged pin 3 is provided inside the outer casing 1 near the front end of the outer casing 1. Both ends of the pin 3 are connected to the side walls of the outer casing 1. Figures 3-9 As shown, the groove 5 on the chuck 200 fits over the pin 3 from top to bottom, and the front ends of the two clamping arms 4 extend to the outside of the outer shell 1, forming a clamping opening 7 between the front ends of the two clamping arms 4.

[0060] The front end of the base block 2 has an abutment portion 2.1 for contacting the chuck 200. The abutment portion 2.1 has a groove 8 corresponding to the position of the pin 3. The abutment portion 2.1 abuts against the clamping arm 4 and drives the two clamping arms 4 to move relative to each other or away from each other, so that the clamping opening 7 opens or closes.

[0061] The metal substrate in this embodiment is made of a non-magnetic or weakly magnetic material, such as titanium.

[0062] The scheme adopted in this embodiment, in which the base block 2 moves forward so that the two clamping arms 4 of the clamp 200 can close together to maintain the clamping state, can, on the one hand, link the opening and closing action of the clamp 200 with the axial movement of the base block 2, making it easier to achieve the closing and clamping of the clamp 200. On the other hand, it can bring the base block 2 closer to the front end of the outer shell. Therefore, when the external iron surgical instruments approach the location of the magnetic positioning clamp in this embodiment from outside the intestinal wall during laparoscopic surgery, the magnetic base block 2 is easier to detect because it is closer to the intestinal wall. Example 4

[0063] Based on the preferred embodiment of the above, such as Figure 3 and Figure 4As shown, the front end face of the abutment 2.1 is connected to the inner wall of the slot 8 via an arc surface 2.2. During the continuous downward movement of the abutment 2.1, it drives the end of the clamping arm 4 away from the pin 3 to swing downwards. When both clamping arms 4 swing downwards, their lower ends close together to clamp the patient's diseased tissue, thus providing a clamping effect. Conversely, when the abutment 2.1 moves upwards, the clamping arms 4, due to their elastic restoring force, tend to move upwards and outwards.

[0064] In this embodiment, the purpose of using a spring-loaded metal substrate for the clamp 200 is to allow the two clamp arms 4 to close to a certain extent when the magnetic positioning clamp passes through the endoscopic forceps channel, so as to facilitate smooth passage through the endoscopic forceps channel. When it exits from the endoscopic forceps channel and is located in the patient's intestine, the clamping opening 7 on the clamp 200 can be opened to the maximum extent, so that when they are completely closed together in the clamping state, they can be clamped and fixed more firmly.

[0065] It should be understood that, without considering the possibility that the clamping fixation is not strong enough, the initial width of the clamping opening 7 of the chuck 200 in the open state may be sufficient to pass through the existing endoscope clamping channel. In this case, the material selected for the chuck 200 may be a metal material that does not have elastic restoring ability. That is, after the two clamping arms 4 of the chuck 200 close from the open state to the clamping state, the chuck 200 undergoes plastic deformation and remains in the current clamping state.

[0066] Preferably, such as Figure 4 and Figure 6 As shown, the arc surface 2.2 and the inner wall of the slot 8 are connected by a slope 2.3. The slope 2.3 is configured such that when the outer side of the clamping arm 4 is in contact with the slope 2.3, the projection of the clamping arm 4 on the cross-section of the outer shell 1 is located inside the outer shell 1. The addition of the slope 2.3 allows the surgeon to push the base block 2 forward using a cable. Figure 6 At the position shown, the upper surface of clamping arm 4 is just in contact with inclined plane 2.3. If the base block 2 is pushed forward further at this point, the change in the force point on clamping arm 4 will increase the resistance acting on base block 2. This creates a sudden increase in resistance and a feeling of jerkiness when the surgeon pushes base block 2 forward. This allows the surgeon to determine the position of the base block simply by observing the movement of the cable. Figure 6 The position of the two clamping arms 4 is such that the clamping arms 4 can pass smoothly through the endoscope channel without the front end of the clamping arms 4 scratching the endoscope channel. Example 5

[0067] Based on the preferred embodiment of the above, the inner wall of the outer shell 1 is provided with a limiting member 9 and at least one positioning member 10. The limiting member 9 is located near the front end face of the outer shell 1 and is used to limit the travel of the base block 2 moving forward along the axial direction. Specifically, the limiting member 9 is an annular protrusion protruding radially inward on the inner wall of the outer shell 1. When the base block 2 moves downward along the axial direction and abuts against the annular protrusion, it limits the base block 2, preventing the base block 2 from continuing to move downward and avoiding the base block 2 from falling out of the outer shell 1.

[0068] The positioning element 10 is arranged on the inner side of the limiting element 9 away from the front end face of the outer shell 1. When the base block 2 moves forward along the axial direction to abut against the limiting element 9, the positioning element 10 is located between the outer side wall of the base block 2 and the inner side wall of the outer shell 1, which is used to restrict the base block 2 from moving backward along the axial direction.

[0069] Preferably, the positioning element 10 is a protruding inverted tooth on the inner sidewall of the outer shell, and the outer sidewall of the base block 2 has a matching inverted tooth groove. As the base block 2 descends to... Figure 8 When the position shown is such that the base block 2 abuts against the limiting member 9, the reverse teeth on the inner side wall of the outer shell engage with the corresponding reverse tooth grooves on the outer side wall of the base block 2, thereby restricting the upward movement of the base block 2 along the axial direction. Example 6

[0070] Based on the preferred embodiment 5 described above, although the magnetic base block 2 can move axially within the outer shell 1, i.e., by moving the base block 2 forward, it can move closer to the patient's intestinal wall tissue held by the clamp 200. However, the length of the clamp arm 4 inevitably results in a large gap between the entire outer shell 1 and the intestinal wall. Since the base block 2 is confined within the outer shell 1, there is a problem that the magnetic attraction between the iron surgical instrument outside the intestinal wall and the base block 2 is weak due to the large gap, making it difficult to detect. Of course, shortening the length of the clamp arm 4 would result in a problem that the clamping opening 7 is too small and the clamping fixation is not secure. The solution in the above embodiment also considered increasing the magnetism of the base block 2, but excessive magnetism would pose a safety risk due to the large instantaneous attraction between the base block 2 and the iron surgical instrument when they approach. Therefore, the magnetic attraction of the base block 2 should not be too large. Therefore, the preferred improvement of this embodiment is: Figures 7-9 As shown, the base block 2 has a central hole 2.4 at the position corresponding to the clamp 200. The central hole 2.4 penetrates the upper and lower end faces of the base block 2 vertically. A core block 11 that matches the cross-section of the central hole 2.4 is embedded in the central hole 2.4. The cable 300 is detachably connected to the upper end of the core block 11. The slot 8 is arranged at the lower end of the core block 11.

[0071] The core block 11 and the base block 2 are configured as follows:

[0072] When the base block 2 moves away from the positioning member 10, the bonding force between the core block 11 and the base block 2 can drive the core block 11 and the base block 2 to move synchronously.

[0073] When the base block 2 descends to the position where the positioning member 10 is located between the outer wall of the base block 2 and the inner wall of the outer shell 1, the tension of the cable 300 acting on the core block 11 can overcome the bonding force between the core block 11 and the base block 2, so that the core block 11 moves upward relative to the base block 2 along the central hole 2.4.

[0074] In this embodiment, the binding force refers to the force exerted by the core block 11 on the base block 2. Preferably, the core block 11 and the base block 2 are tightly fitted together. The binding force between the core block 11 and the base block 2 is the frictional force between the core block 11 and the base block 2. This frictional force is greater than the sum of the sliding friction between the base block 2 and the outer shell 1 and the weight of the base block 2. This allows the core block 11 to drive the base block 2 to move axially within the outer shell 1. Of course, in actual use, the magnetic positioning clip of this embodiment does not necessarily clamp the patient's intestinal wall vertically. It can clamp the patient's intestinal wall tissue in a horizontal, inclined, or inverted direction. Therefore, in actual use, the weight of the base block 2 does not completely become the resistance to the binding force between the core block 11 and the base block 2.

[0075] Furthermore, in order to ensure that the bonding force between the core block 11 and the base block 2 is within the standard numerical range, a friction layer with a relatively accurate coefficient of friction can be coated between the core block 11 and the base block 2, or all of the core block 11 or the part in contact with the base block 2 can be made of an elastic material, thereby ensuring that the friction force between the core block 11 and the base block 2 is within the standard numerical range.

[0076] Furthermore, the bonding force between the core block 11 and the base block 2 is the adhesive force that bonds and fixes the core block 11 and the base block 2 together.

[0077] In this embodiment, when base block 2 moves down to... Figure 7 When the base block 2 abuts against the limiting member 9, the positioning member 10 is tightly fitted between the outer side wall of the base block 2 and the inner side wall of the outer shell 1. Thus, the base block 2 is constrained to its current position by the positioning member 10. At this time, when the cable 300 applies an upward pulling force to the core block 11, this pulling force will overcome the original binding force between the core block 11 and the base block 2, causing the core block 11 to move relative to the base block 2. That is, the core block 11 moves upward relative to the base block 2 to... Figure 9The position is shown. During this process, since the slot 8 is located at the lower end of the core block 11, the upper end of the chuck 200 with the groove 5 is locked within the slot 8. The two clamping arms 4 on the chuck 200 have a gap or are in close contact with the inner wall of the central hole on the base block 2, allowing the core block 11 to drive the chuck 200 to move synchronously relative to the base block 2. This causes the clamping arms of the entire chuck 200 to retract axially into the outer shell 1, ultimately bringing the base block 2 and the outer shell 1 closer to the location of the clamping port 7, and thus closer to the patient's intestinal wall clamped by the clamping port 7. This allows external iron surgical instruments to more easily locate the base block 2 during exploration through magnetic attraction. Example 7

[0078] Based on the preferred embodiment 6 above, in which the chuck 200 moves with the core block 11, the chuck 200 is provided with a protrusion 6 on the outer side away from the groove 5, and the bottom of the slot 8 is provided with a slot 11.1 that matches the protrusion 6. When the core block 11 drives the base block 2 down to abut against the limiting member 9, the protrusion 6 is inserted into the slot 11.1 and tightly fitted with the slot 11.1.

[0079] Specifically, the outer wall of the protruding post 6 is connected to the inner wall of the slot 11.1 by a toothed snap-fit ​​connection. Example 8

[0080] In the above embodiment, the pull cable 300 and the core block 11 need to be disengaged in the end so that the entire magnetic positioning clip in this embodiment can be released and clamped on the lesion area that needs to be marked on the intestinal wall of the patient, so as to play a marking role. For this purpose, the release structure of various existing disposable hemostatic clips can be used between the pull cable 300 and the core block 11. However, the existing release structure is relatively complicated. For the sake of the preferred release structure between the pull cable 300 and the core block 11, the improvement of this embodiment is that: the pull cable 300 is a thin traction wire, and the rear end of the core block 11 is provided with multiple claws 12. Each claw 12 surrounds to form a mounting hole 13 that matches the traction wire, and the traction wire is inserted into the mounting hole 13;

[0081] When the rear end of the core block 11 is placed in the central hole 2.4 of the base block 2, the inner wall of the central hole 2.4 drives each claw 12 to move inward and tighten the traction wire; that is, the inner wall of the central hole 2.4 forms a constraint on the claw 12, and the force exerted by the inner wall of the central hole 2.4 on the claw 12 drives all the claws 12 to close inward, thereby causing the claws 12 to tighten the end of the traction wire located in the mounting hole 13;

[0082] When the core block 11 moves upward so that its rear end is exposed outside the central hole 2.4, the claw 12 moves outward under its own elastic restoring force, thereby disengaging the claw 12 from the traction wire. Figure 7 and Figure 9 As shown, with the pull cable 300 driving, the pull cable 300 can drive the core block 11 to move upward relative to the base block 2. As the core block 11 gradually moves upward, the portion of the rear end of the core block 11 exposed outside the central hole 2.4 increases, and the clamping force of the claw 12 on the traction wire gradually decreases until the traction wire is completely disengaged from the core block 11.

[0083] Preferably, the frictional force on the inner surface of the claw 12 at the location of the mounting hole 13 is greater than the frictional force between the claw 12 and the inner wall of the central hole 2.4. Specifically, the contact area between the claw 12 and the inner wall of the central hole 2.4 is reduced, so that the bonding force between the pull cable 300 and the core block 11 is greater than the bonding force between the core block 11 and the base block 2. Thus, before the clamp holds the patient's tissue, the pull cable 300 can drive the core block 11 and the base block 2 to move synchronously, controlling the opening and closing action of the clamp 200. After the clamp 200 clamps the patient's intestinal wall tissue, the core block 11 can be moved upward by pulling the pull cable 300. Figure 9 When the position is reached, cable 300 disengages from core block 11, completing the release of the entire magnetic positioning clamp.

[0084] In this embodiment, the traction wire is a metal wire.

[0085] It should be understood that a sleeve (not shown in the figure) is also fitted over the pull cable 300. The sleeve is connected to the rear end of the outer shell 1 and is fitted over the pull cable 300. The sleeve can drive the entire clamp body 100 to move within the endoscopic forceps channel. When it moves to the position of the clamp 200 near the lesion tissue on the patient's intestinal wall, the above-mentioned clamping action is completed by the pull cable 300. After the clamping is in place, the sleeve is pulled, and the sleeve is disengaged from the outer shell 1. The disengagement between the sleeve and the outer shell 1 can be achieved by disconnection, elastic deformation of the sleeve to disengage from the groove on the outer shell 1, or the sleeve and the outer shell 1 are first bonded together, and the bonded position is disengaged by the pulling force of the sleeve.

[0086] Preferably, after the clamp 200 is clamped onto the intestinal wall tissue that the patient needs to target, the pull cable 300 is pulled to disengage the pull cable 300 from the core block 11, and then the sleeve is disengaged from the outer shell 1.

[0087] The magnetic positioning clips in the above embodiments are based on the principle of magnetic attraction between two magnetic materials. Since various iron surgical instruments already exist, if a magnetic instrument can be left in the area of ​​the observed tumor tissue before the patient's endoscopic examination, it can serve as a marker. This allows for subsequent laparoscopic surgery, where iron surgical instruments can be used to gently probe along the length of the intestine from outside the abdominal wall. This eliminates the need for intraoperative endoscopy or the use of staining agents, significantly reducing the time spent determining the tumor location and the risks associated with staining agents. Therefore, as... Figures 13-14 As shown, the clinical feasibility of this approach was verified by attaching a ring-shaped magnetic block to an existing hemostatic clip. This method fully utilizes existing endoscopic hemostatic clips, using the additional ring-shaped magnetic block attached as a marker to magnetically attract the iron surgical instruments outside the intestinal wall. Specifically, after the endoscope locates the tumor area in the patient's intestine, it is first removed, and then... Figure 13 The procedure involves extending the tip of the hemostatic clip into the endoscope's clamping channel, then securing a sterilized ring-shaped magnetic block to the clip with surgical sutures. The endoscope tip, carrying the ring-shaped magnetic block, is then re-entered into the patient's intestine. Finally, the hemostatic clip is clamped onto the tumor area on the intestinal wall, completing the release of the clip. This process requires not only additional securing of the ring-shaped magnetic block but also the need to withdraw and re-enter the endoscope, complicating the operation. Crucially, re-entering the patient's intestine with the endoscope tip still attached to the magnetic block adds further difficulty to the endoscope's insertion, and keeping the hemostatic clip exposed poses a risk of scratching the intestinal wall. Therefore, in the above embodiments, the clamp body of the magnetic positioning clip serves as the magnetic block.

[0088] It should be understood that in actual laparoscopic surgery, surgeons can clamp multiple magnetic positioning clips around the tumor tissue on the intestinal wall, or set multiple magnetic positioning clips in the same location. The clamp bodies of adjacent magnetic positioning clips can be attracted and fixed to each other under the action of mutual magnetic attraction, thereby creating a stronger magnetic field in this area, which is beneficial for the iron surgical instruments outside the intestinal wall to be more easily detected.

[0089] It should be noted that in the description of this invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0090] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0091] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0092] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0093] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0094] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0095] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be construed as covering all changes and modifications that encompass the true intent and scope of the invention. Any and all equivalent scope and content within the scope of the claims should be considered to remain within the intent and scope of the invention.

Claims

1. An endoscopic magnetic positioning clip for tumor marking and localization in laparoscopic surgery, characterized in that: Includes the clamp body, the clamps arranged within the clamp body, and the cable; The clamp body includes a shell whose outer contour matches the endoscope clamp channel. Inside the shell, there is a base block that slides with the shell. The base block is made of permanent magnet material, and the shell is made of non-magnetic material. The inner sidewall of the shell is provided with a limiting member and at least one positioning member. The limiting member is located near the front end face of the shell, and the positioning member is arranged on the inner side of the limiting member away from the front end face of the shell. The chuck includes two clamping arms formed by bending a strip of metal substrate along the middle position. The rear ends of the two clamping arms are connected to form a groove. A horizontally arranged pin is provided inside the housing near the front end of the housing. The groove on the chuck is fitted over the pin, and the front ends of the two clamping arms extend to the outside of the housing. A clamping opening is formed between the front ends of the two clamping arms. The front end of the base block has an abutment portion for abutting against the clamp arm. The base block has a central hole at the position corresponding to the clamp head. The central hole penetrates the base block vertically and a core block is embedded in the central hole. One end of the cable extends into the housing through the rear end of the housing and is detachably connected to the core block. The core block and the base block are configured as follows: When the base block moves away from the positioning component, the bonding force between the core block and the base block can drive the core block and the base block to move synchronously. When the base block descends to the point where the positioning element is located between the outer wall of the base block and the inner wall of the outer shell, the tension force exerted by the cable on the core block can overcome the bonding force between the core block and the base block, causing the core block to move upward relative to the base block along the central hole. The abutment part has a slot corresponding to the position of the pin. The slot is arranged at the lower end of the core block, and the upper end of the chuck is locked in the slot, so that the core block can drive the chuck to move synchronously.

2. The endoscopic magnetic positioning clip for tumor marking and localization in laparoscopic surgery according to claim 1, characterized in that: The front end face of the abutting part is connected to the inner wall of the slot through a rounded transition surface.

3. The endoscopic magnetic positioning clip for tumor marking and localization in laparoscopic surgery according to claim 2, characterized in that: The arc surface and the inner wall of the slot are connected by a slope. The slope is configured such that when the outer side of the clamping arm is in contact with the slope, the projection of the clamping arm on the cross-section of the outer shell is located inside the outer shell.

4. The endoscopic magnetic positioning clip for tumor marking and localization in laparoscopic surgery according to claim 1, characterized in that: The chuck has a protrusion on the outside of the groove, and the core block has a slot that matches the protrusion. When the core block drives the base block to move down to abut against the limiting member, the protrusion is inserted into the slot and fits tightly with the slot.

5. The endoscopic magnetic positioning clip for tumor marking and localization in laparoscopic surgery according to claim 1, characterized in that: The cable is a slender traction wire, and the rear end of the core block is provided with multiple claws. The claws close together to form a mounting hole that matches the traction wire, and the traction wire is inserted into the mounting hole. When the rear end of the core block is placed in the central hole of the base block, the inner wall of the central hole drives each claw to move inward and tighten the traction wire; When the core block moves upward so that its rear end is exposed outside the central hole, the claw moves outward under its own elastic restoring force, so that the claw disengages from the traction wire.

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