Mucosa incision knife with switchable head state

Abstract

The utility model discloses a mucous membrane incision knife of switchable tool bit state, including handle, control rod, linkage sliding block, outer tube, first inner tube, second inner tube, non -ceramic tool bit and ceramic tool bit, one end of first inner tube is connected non -ceramic tool bit, and the other end is connected control rod, one end of second inner tube is connected ceramic tool bit, and the other end is connected linkage sliding block, and control rod is through the rotation movement and is in abutment or misregistration with linkage sliding block, when control rod and linkage sliding block abut, non -ceramic tool bit is located the rear of ceramic tool bit, and control rod promotes non -ceramic tool bit and ceramic tool bit simultaneously, when control rod and linkage sliding block misregistration, control rod only promotes non -ceramic tool bit, the utility model discloses can realize two kinds of tool bits can all stretch out and select different tool bits work according to different conditions operation, avoid frequently switching tool bits, shorten the operation time.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a mucosal incision knife with switchable blade head states. Background Technology

[0002] The mucosal incision knife is the core tool of endoscopic mucosal dissection (ESD), used to treat lesions such as early gastrointestinal cancer, large polyps, and submucosal tumors. Traditional ESD surgery requires frequent changes of the injection needle (submucosal water injection to form a "water cushion" to prevent perforation) and the incision knife, making the operation cumbersome and prolonging the operation time (average 30-60 minutes). Intraoperative saline loss requires repeated water injection, increasing the risk of perforation (occurrence rate 5-10%) and bleeding. Therefore, multifunctional integrated design has become the core driving force for technological iteration.

[0003] In current endoscopic submucosal dissection (ESD) procedures, surgeons need to frequently switch instruments depending on the stage of the surgery: non-ceramic tips (such as hook knives and needle knives) are suitable for quickly cutting superficial tissues, but the fully conductive properties of metal can easily lead to thermal damage to the muscle layer (perforation rate 5-10%); ceramic tips (such as zirconia insulated knives) can precisely control the cutting depth, but they have low toughness, are prone to breakage, and cannot handle hard tissues or withstand impact. Traditional split-type operation not only prolongs the operation time (average 30-60 minutes), but also increases the risk of endoscopic forceps channel injury due to instrument changes.

[0004] Patent number CN223126627U discloses a plasma electrode containing two blades. This patent simply installs the two blades in the same blade tube. The first blade is used for cutting operations and does not need to be retracted, so it can be in a fixed state. Only the second blade needs to be extended and retracted. This invention is not applicable to the two blades used for precision operations.

[0005] Therefore, integrating the functions of two precision cutting heads into a single instrument has become a direction for technological breakthrough. Utility Model Content

[0006] To address the technical problems of existing mucosal incision knives that can only perform single-instrument operations, require frequent instrument switching, and result in cumbersome operation and long operation time, this utility model provides a mucosal incision knife with switchable blade states to solve the above problems.

[0007] The technical solution adopted by this utility model to solve its technical problem is: a mucosal incision knife with switchable blade state, including a handle, a control rod, a linkage slider, an outer tube, a first inner tube, a second inner tube, a non-ceramic blade head, and a ceramic blade head. The first inner tube, the second inner tube, and the outer tube are arranged sequentially from the inside to the outside. The outer tube is connected to the handle. One end of the first inner tube is connected to the non-ceramic blade head, and the other end is connected to the control rod. One end of the second inner tube is connected to the ceramic blade head, and the other end is connected to the linkage slider. The control rod can rotate or slide relative to the handle. The control rod abuts or misaligns with the linkage slider through rotational movement. When the control rod abuts with the linkage slider, the non-ceramic blade head is located behind the ceramic blade head, and the control rod pushes both the non-ceramic blade head and the ceramic blade head simultaneously. When the control rod misaligns with the linkage slider, the control rod only pushes the non-ceramic blade head.

[0008] In an optional embodiment of this utility model, the control lever includes a lever body, a sliding knob, and a limiting block. The surface of the handle has a sliding groove. The limiting block is fixed to the side wall of the lever body. One end of the sliding knob is rotatably sleeved on the outer periphery of the lever body, and the other end of the sliding knob extends out of the sliding groove. The control lever abuts against the linkage slider through the limiting block.

[0009] In an optional embodiment of this utility model, the end of the sliding knob extending out of the sliding groove is provided with an operating head, the width of which is greater than the width of the sliding groove.

[0010] In an optional embodiment of this utility model, the ceramic cutter head has a support surface inside, and the outer surface of the support surface forms a groove with the ceramic cutter head that can accommodate a non-ceramic cutter head. The second inner tube is connected to the support surface through a support rod.

[0011] In an optional embodiment of this utility model, the linkage slider includes a long strip plate extending axially along the outer tube. When the limiting block is directly opposite the long strip plate, the control rod can push the linkage slider.

[0012] In an optional embodiment of this utility model, the linkage slider further includes a transition ring connected to a long strip plate at one end and an abutment ring connected to the other end of the transition ring, wherein the abutment ring is located inside the transition ring.

[0013] In an optional embodiment of this utility model, the handle has a plurality of support rings inside, the outer periphery of the transition ring is provided with an axially extending limiting rib, and the support ring located on the outer periphery of the transition ring has a limiting groove for the limiting rib to pass through axially.

[0014] In an optional embodiment of this utility model, the handle is provided with two opposing first limiting plates, and a first limiting channel is formed between the two first limiting plates. The long strip moves back and forth along the first limiting channel.

[0015] In an optional embodiment of this utility model, the handle is further provided with two opposing second limiting plates, and a second limiting channel is formed between the two second limiting plates. The first limiting plate and the second limiting plate are arranged symmetrically, and the end of the control rod is provided with an arrow mark.

[0016] In an optional embodiment of this utility model, the two first limiting plates have different lengths. When the control lever moves to the rear limit position, the limiting block is located outside one of the first limiting plates.

[0017] The beneficial effects of this utility model are: (1) This utility model controls the extension of the ceramic blade by rotating the control lever. At the same time, the non-ceramic blade can be located behind the ceramic blade when the ceramic blade is extended, so that both blades can be extended and different blades can be selected for operation according to different situations, avoiding frequent switching of blades and shortening the operation time.

[0018] (2) In this utility model, the non-ceramic cutter head is set inside the ceramic cutter head. When the ceramic cutter head is extended, the non-ceramic cutter head moves synchronously, but is hidden inside the ceramic cutter head.

[0019] (3) The linkage slider in this utility model is axially fixed to the handle by the limiting ring to ensure the stability of linear motion.

[0020] (4) The present invention limits the rotation angle position of the control rod within the two sets of limit plates by setting two sets of limit plates. The working state of the cutter head can be distinguished by the arrow marking at the end of the control rod. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a front view of a specific embodiment of the mucosal cutting knife with switchable blade states described in this utility model; Figure 2 yes Figure 1 Sectional view along axis AA; Figure 3 yes Figure 1 BB-direction sectional view; Figure 4 When the cutter head is in the retracted state, Figure 1 CC-direction sectional view; Figure 5 yes Figure 4 DD section view; Figure 6 yes Figure 4 Enlarged view of point a in the middle; Figure 7 When the ceramic blade extends, Figure 5 Schematic diagram of the section; Figure 8 yes Figure 7 Enlarged view at point b in the middle; Figure 9 This is a schematic diagram showing the relationship between the limiting block and the outer tube when the ceramic cutter head extends. Figure 10 This is a diagram showing the state indicated by the arrow at the end of the control lever when the ceramic cutter head is extended. Figure 11 When the non-ceramic cutter head extends, Figure 5 Schematic diagram of the section; Figure 12 This is a schematic diagram showing the relationship between the limiting block and the outer tube when the non-ceramic cutter head extends. Figure 13 This is a diagram showing the state indicated by the arrow at the end of the control lever when the non-ceramic cutter head is extended.

[0023] In the diagram, 1. Handle, 101. Sliding groove, 2. Control lever, 201. Lever body, 202. Sliding knob, 203. Limiting block, 204. Operating head, 3. Linkage slider, 301. Long strip plate, 302. Transition ring, 303. Abutment ring, 4. Outer tube, 5. First inner tube, 6. Second inner tube, 7. Non-ceramic cutter head, 8. Ceramic cutter head, 9. Electrode head, 10. Support ring, 11. Limiting rib, 12. Limiting groove, 13. Support surface, 14. Groove, 15. Support rod, 16. Rod part, 17. Head, 18. First limiting plate, 19. First limiting channel, 20. Arrow mark, 21. Second limiting plate, 22. Second limiting channel. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In this utility model, the term "front" refers to the direction in which the blade extends, and conversely, "rear" refers to the direction in which the blade extends.

[0026] Example 1 like Figures 1-6As shown, a mucosal incision knife with switchable blade states includes a handle 1, a control lever 2, a linkage slider 3, an outer tube 4, a first inner tube 5, a second inner tube 6, a non-ceramic blade 7, and a ceramic blade 8. The first inner tube 5, the second inner tube 6, and the outer tube 4 are arranged sequentially from the inside to the outside. The outer tube 4 is connected to the handle 1 to form the complete shell of the mucosal incision knife. One end of the first inner tube 5 is connected to the non-ceramic blade 7, and the other end is connected to the control lever 2. One end of the second inner tube 6 is connected to the ceramic blade 8, and the other end is connected to the linkage slider 3. The non-ceramic blade 7 is electrically connected to an electrode head 9. The control lever 2 can rotate or slide relative to the handle 1. The control lever 2 controls the back-and-forth movement of the first inner tube 5 and the second inner tube 6, and also switches the working states of different blades through rotation. The second inner tube 6 is a simple tubular structure, while the linkage slider 3 can be set as an irregular structure, serving as an intermediate connector between the second inner tube 6 and the control lever 2. Control lever 2 rotates to abut or displace the linkage slider 3. When control lever 2 abuts the linkage slider 3, the non-ceramic cutter head 7 is located behind the ceramic cutter head 8, and control lever 2 pushes both the non-ceramic cutter head 7 and the ceramic cutter head 8 at the same time. When control lever 2 displaces the linkage slider 3, control lever 2 only pushes the non-ceramic cutter head 7.

[0027] In this invention, the non-ceramic cutter head 7 extends and retracts synchronously with the control rod 2, while the ceramic cutter head 8 achieves synchronous movement through the cooperation of the linkage slider 3 and the control rod 2. When the control rod 2 rotates to a position misaligned with the linkage slider 3, there is no cooperation between the two, and the control rod 2 cannot drive the linkage slider 3 to move. Simultaneously, when the control rod 2 pushes the linkage slider 3, thereby pushing the ceramic cutter head 8 to extend, the non-ceramic cutter head 7 also moves with the control rod 2. By positioning the non-ceramic cutter head 7 behind the ceramic cutter head 8, the ceramic cutter head 8 is in a working state, while the non-ceramic cutter head 7, located behind it, is in a non-working state. When the control rod 2 only pushes the non-ceramic cutter head 7, the non-ceramic cutter head 7 is in front of the ceramic cutter head 8, the non-ceramic cutter head 7 is in a working state, and the ceramic cutter head 8 is in a non-working state.

[0028] Because the ceramic cutter head 8 is relatively large, the non-ceramic cutter head 7 can be hidden behind the ceramic cutter head 8 when the ceramic cutter head 8 is in operation.

[0029] Control lever 2: like Figure 4 and Figure 5As shown, the control lever 2 includes a rod 201, a sliding knob 202, and a limiting block 203. The handle 1 has a sliding groove 101 on its surface. The limiting block 203 is fixed to the side wall of the rod 201. One end of the sliding knob 202 is rotatably fitted onto the outer circumference of the rod 201, and the other end extends out of the sliding groove 101. The control lever 2 abuts against the linkage slider 3 via the limiting block 203. The rod 201 has a cylindrical structure. During axial reciprocating motion, the rod 201 itself does not contact the linkage slider 3, but rather through the laterally protruding limiting block 203. When the rod 201 rotates, the circumferential position of the limiting block 203 changes, shifting away from the linkage slider 3, thus preventing it from contacting the linkage slider 3. The sliding knob 202 rotates with the rod 201 to control the forward and backward movement of the lever 2, but does not rotate with the rod 201.

[0030] In a further design, the end of the sliding knob 202 extending out of the sliding groove 101 is provided with an operating head 204. The width of the operating head 204 is greater than the width of the sliding groove 101, and the cross-sectional dimension of the operating head 204 is greater than the cross-sectional dimension of the sliding knob 202, making operation easier. The design that the width of the operating head 204 is greater than the width of the sliding groove 101 also serves to limit the sliding knob 202.

[0031] Linked slider 3: The linkage slider 3 includes a long strip plate 301 extending along the axial direction of the outer tube 4. When the limiting block 203 is aligned with the long strip plate 301, the control rod 2 can push the linkage slider 3.

[0032] To improve the structural strength of the handle 1 and to limit the linear motion of the control lever 2, it is preferable to provide several support rings 10 on the inner surface of the handle 1.

[0033] Example 2 Based on Example 1, such as Figure 5 As shown, the linkage slider 3 also includes a transition ring 302 connected to the long strip plate 301 at one end and an abutment ring 303 connected to the other end of the transition ring 302. The abutment ring 303 is located inside the transition ring 302. Since the outer diameter of the second inner tube 6 is small and the distance between the long strip plate 301 and the center of the handle 1 is large, the transition ring 302 and the abutment ring 303 are used for transitional connection. The inner diameter of the transition ring 302 is larger than the outer diameter of the control rod 2. When the limit block 203 does not abut against the long strip plate 301, the control rod 2 can independently push the first inner tube 5. During this process, the control rod 2 can enter the interior of the transition ring 302. Before reaching the abutment ring 303, the first cutter head reaches the working position.

[0034] To prevent the circumferential position of the long strip 301 from changing due to the rotation of the sliding knob 202, further design considerations include... Figure 2 and Figure 3As shown, the outer periphery of the transition ring 302 is provided with an axially extending limiting rib 11, and the support ring 10 located on the outer periphery of the transition ring 302 has a limiting groove 12 for the limiting rib 11 to pass through axially. The limiting rib 11 is preferably in the same plane as the long strip plate 301. During the sliding of the sliding knob 202, the long strip plate 301 can also enter the limiting groove 12. Of course, the limiting rib 11 may not be in the same plane as the long strip plate 301. In this case, other groove structures need to be opened for the long strip plate 301 to pass through.

[0035] Example 3 Based on the above embodiments, the ceramic cutter head 8 has a support surface 13 inside, and the outer surface of the support surface 13 forms a groove 14 with the ceramic cutter head 8 to accommodate the head 17 of the non-ceramic cutter head 7. The second inner tube 6 is connected to the support surface 13 through a support rod 15. Figure 6 and Figure 8 As shown, both the non-ceramic cutter head 7 and the ceramic cutter head 8 include a rod 16 and a head 17. The support surface 13 has a hole through which the rod 16 of the non-ceramic cutter head 7 passes. The rod 16 of the non-ceramic cutter head 7 is connected to the first inner tube 5. The rod 16 of the ceramic cutter head 8 is also the support rod 15. The support surface 13 is located inside the head 17 of the ceramic cutter head 8. When the ceramic cutter head 8 is in operation, the non-ceramic cutter head 7 is hidden inside the ceramic cutter head 8 (e.g., ...). Figure 8 As shown), when the non-ceramic cutter head 7 is in the working state, the ceramic cutter head 8 retracts to abut against the end of the outer tube 4 (as shown). Figure 11 (As shown).

[0036] Example 4 Based on the above embodiment, the handle 1 is provided with two opposing first limiting plates 18, and a first limiting channel 19 is formed between the two first limiting plates 18. The elongated plate 301 reciprocates along the first limiting channel 19. The setting of the first limiting plates 18 can limit the movement range of the limiting block 203 and the elongated plate 301, and prevent the control lever 2 from shaking during the sliding process.

[0037] In a further design, the handle 1 is further provided with two opposing second limiting plates 21, forming a second limiting channel 22 between the two second limiting plates 21. The first limiting plate 18 and the second limiting plate 21 are arranged symmetrically, and the end of the control lever 2 is provided with an arrow mark 20. Figure 7 As shown, when using the ceramic cutter head 8, first pull the control lever 2 backward to disengage the limit block 203 from the two limit plates, then rotate the lever 201 until the arrow mark 20 faces downward (as shown). Figure 9 and Figure 10 As shown, at this time, the limiting block 203 is located within the first limiting channel 19), and the sliding button is pushed back and forth. At this time, the cutter head is in the state of ceramic cutter head 8; as shown Figure 11As shown, when using the non-ceramic cutter head 7, first pull the control lever 2 backward to disengage the limit block 203 from the two limit plates, then rotate the lever 201 until the arrow mark 20 faces upward (as shown). Figure 12 and Figure 13 As shown, at this time, the limiting block 203 is located in the second limiting channel 22). Push the sliding button back and forth, and the blade head is in the non-ceramic blade head 7 state. Connect the high-frequency electrosurgical unit to the electrode head 9, and perform electrosurgical cutting on the lesion after power is applied.

[0038] In a further design, the two first limiting plates 18 are of unequal length. When the control lever 2 moves to its rearmost position, the limiting block 203 is located outside one of the first limiting plates 18. Figure 3 As shown, the left extension length of the upper first limiting plate 18 is greater than the left extension length of the lower first limiting plate 18. When the control lever 2 moves to the rear limit position, the limiting block 203 is still below the upper first limiting plate 18, but has exceeded the lower first limiting plate 18. Therefore, the limiting block 203 can rotate downwards, while the upper first limiting plate 18 can limit the limiting block 203. Similarly, the lengths of the two second limiting plates 21 can also be unequal, and the longer second limiting plate 21 and the longer first limiting plate 18 are located on the same side, that is, the two limiting plates are symmetrically arranged. Thus, the rotation angle limit of the limiting block 203 can be limited by the two longer first limiting plates 18 and the second limiting plate 21.

[0039] In the description of this utility model, it should be understood that the terms "center", "length", "front", "rear", "left", "inner", "outer", "axial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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 utility model.

[0040] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0041] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0042] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A mucosal incision knife with switchable blade head states, characterized in that: The device includes a handle (1), a control lever (2), a linkage slider (3), an outer tube (4), a first inner tube (5), a second inner tube (6), a non-ceramic cutter head (7), and a ceramic cutter head (8). The first inner tube (5), the second inner tube (6), and the outer tube (4) are arranged sequentially from the inside to the outside. The outer tube (4) is connected to the handle (1). One end of the first inner tube (5) is connected to the non-ceramic cutter head (7), and the other end is connected to the control lever (2). One end of the second inner tube (6) is connected to the ceramic cutter head (8), and the other end is connected to the control lever (2). One end is connected to the linkage slider (3), and the control rod (2) can rotate or slide relative to the handle (1); the control rod (2) abuts or misaligns with the linkage slider (3) through rotational movement. When the control rod (2) abuts with the linkage slider (3), the non-ceramic cutter head (7) is located behind the ceramic cutter head (8), and the control rod (2) pushes the non-ceramic cutter head (7) and the ceramic cutter head (8) at the same time. When the control rod (2) misaligns with the linkage slider (3), the control rod (2) only pushes the non-ceramic cutter head (7).

2. The mucosal incision knife with switchable blade state according to claim 1, characterized in that: The control lever (2) includes a lever body (201), a sliding knob (202), and a limiting block (203). The handle (1) has a sliding groove (101) on its surface. The limiting block (203) is fixed to the side wall of the lever body (201). One end of the sliding knob (202) is rotatably sleeved on the outer periphery of the lever body (201), and the other end of the sliding knob (202) extends out of the sliding groove (101). The control lever (2) abuts against the linkage slider (3) through the limiting block (203).

3. The mucosal incision knife with switchable blade state according to claim 2, characterized in that: The sliding knob (202) has an operating head (204) at one end extending out of the sliding groove (101), and the width of the operating head (204) is greater than the width of the sliding groove (101).

4. The mucosal incision knife with switchable blade state according to claim 2, characterized in that: The ceramic cutter head (8) has a support surface (13) inside. The outer surface of the support surface (13) and the ceramic cutter head (8) form a groove (14) that can accommodate the head of the non-ceramic cutter head (7). The second inner tube (6) is connected to the support surface (13) through a support rod (15).

5. The mucosal incision knife with switchable blade state according to claim 2, characterized in that: The linkage slider (3) includes a long strip plate (301) extending axially along the outer tube (4). When the limiting block (203) is facing the long strip plate (301), the control rod (2) can push the linkage slider (3).

6. The mucosal incision knife with switchable blade state according to claim 2, characterized in that: The linkage slider (3) also includes a transition ring (302) connected to the long strip plate (301) at one end and an abutment ring (303) connected to the other end of the transition ring (302), wherein the abutment ring (303) is located inside the transition ring (302).

7. The mucosal incision knife with switchable blade state according to claim 6, characterized in that: The handle (1) has several support rings (10) inside, and the outer periphery of the transition ring (302) is provided with an axially extending limiting rib (11). The support ring (10) located on the outer periphery of the transition ring (302) has a limiting groove (12) for the limiting rib (11) to pass through axially.

8. The mucosal incision knife with switchable blade state according to claim 5, characterized in that: The handle (1) has two opposing first limiting plates (18) inside, and a first limiting channel (19) is formed between the two first limiting plates (18). The long strip (301) moves back and forth along the first limiting channel (19).

9. The mucosal incision knife with switchable blade state according to claim 8, characterized in that: The handle (1) is also provided with two opposing second limiting plates (21), and a second limiting channel (22) is formed between the two second limiting plates (21). The first limiting plate (18) and the second limiting plate (21) are arranged symmetrically, and the end of the control rod (2) is provided with an arrow mark (20).

10. The mucosal incision knife with switchable blade state according to claim 8, characterized in that: The two first limiting plates (18) are of different lengths. When the control lever (2) moves to the rear limit position, the limiting block (203) is located outside one of the first limiting plates (18).

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