A mucosal incision knife

Abstract

The utility model provides a mucosal incision knife, which relates to the technical field of medical instruments. A locking component is fixed on the injection connecting tube of the disclosed mucosal incision knife, and the locking component comprises a locking structure and a limiting tube, wherein the limiting tube is fixed in the outer tube, and the locking structure can move along its axial direction in the limiting tube, and the locking structure comprises a steel ball, and a plurality of concave notches matched with the steel balls are provided on the inner peripheral wall of the limiting tube. When the control handle controls the cable to move from the proximal end to the distal end, the steel balls in the locking structure are pushed into the concave notches at different positions to complete the locking of different knife extension lengths. The knife extension length is controlled by the cooperation of the steel ball and the concave notches at different positions, and the knife extension length can be controlled according to actual needs without replacing the overall mucosal incision knife instrument, thereby effectively saving operation time and cost.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a mucosal incision knife. Background Art

[0002] Endoscopic technology has been around for more than 50 years and has gone through the stages from disease diagnosis to disease treatment. It has become very effective and reliable for the treatment of some digestive diseases and has even become the first choice for treatment. In recent years, with the development of endoscopic technology, endoscopic tissue biopsy, endoscopic mucosal resection (EMR), and endoscopic submucosal dissection (ESD) have been widely used. They are gradually becoming the first choice for the treatment of gastrointestinal bleeding, polypectomy, and early cancer. Among them, ESD plays a key role in the discovery, diagnosis, and removal of early cancer.

[0003] ESD surgery achieves en bloc resection of larger lesions and provides accurate pathological diagnosis and staging of lesions. Compared with traditional surgical operations, ESD not only cures tumors but also better preserves the physiological functions of the digestive tract, significantly improves the patient's quality of life after surgery, and has become the preferred treatment for early digestive tract cancer and precancerous lesions including the esophagus.

[0004] When performing ESD surgery, mucosal cutters with different blade lengths are required depending on the location of the lesion to be treated. For example, when treating lesions in narrow cavities such as the esophagus and colon, a mucosal cutter with a shorter blade length is required to prevent accidental injury to the patient during the operation; when treating gastric lesions, a mucosal cutter with a longer blade length is required, but the existing mucosal cutter has a fixed blade length and cannot be adjusted according to actual needs. When a mucosal cutter with a different blade length is needed during the operation, the entire mucosal cutter needs to be replaced, which will undoubtedly prolong the operation time and cause waste of the mucosal cutter instrument. Utility Model Content

[0005] The utility model discloses a mucosal incision knife, which solves the problem that the existing mucosal incision knife has a fixed blade extension length and cannot adjust the blade extension length according to actual needs. When a mucosal incision knife with a different blade extension length is needed, the whole mucosal incision knife needs to be replaced, resulting in prolonged operation time and waste of mucosal incision knife instruments. The control of different blade extension lengths can be achieved by cooperation between a steel ball in a locking component and concave notches at different positions on the inner circumferential wall of a limiting tube. There is no need to replace the whole mucosal incision knife instrument, which effectively saves operation time and has a simple structure and is easy to implement.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is specifically implemented as follows:

[0007] The utility model discloses a mucosal incision knife, comprising an outer tube and a control handle connected to the proximal end of the outer tube, wherein an injection knife head, an injection connecting tube and a pull cable are arranged inside the outer tube, the distal end of the injection connecting tube is connected to the injection knife head, the proximal end of the injection connecting tube is connected to the pull cable, an injection inlet is opened on the side wall of the injection connecting tube, an injection port and an electrode plug are arranged on the control handle, the proximal end of the pull cable is connected to the electrode plug, the control handle can control the pull cable to retract or push the injection knife head into or out of the outer tube, an insulating sleeve is arranged at the distal end of the outer tube, the inner wall of the insulating sleeve is in clearance with the injection knife head, and the insulating sleeve is in clearance with the injection knife head. A reverse tooth structure is formed at the proximal end of the edge sleeve, which is characterized in that a locking assembly is fixed on the injection connecting tube, and the locking assembly includes a locking structure and a limiting tube. The limiting tube is fixed in the outer tube, and the locking structure can move along its axial direction in the limiting tube. A first circular groove is formed on the end face of the locking structure facing the limiting tube, and a steel ball is placed in the first circular groove. A plurality of concave notches matching the steel balls are formed on the inner circumferential wall of the limiting tube. When the control handle controls the cable to move from the proximal end to the distal end, the steel balls in the locking structure are pushed into the concave notches at different positions to complete the locking of different knife lengths.

[0008] Further, the locking structure includes a fixed base and a locking bracket, the locking bracket is rotatably mounted on the fixed base, and the fixed base is fixedly mounted on the injection connecting pipe; the locking bracket includes a first supporting arm and a second supporting arm, the first supporting arm includes a first straight portion and a first bent portion, the first bent portion is formed at one end of the first straight portion, and a first groove is provided on the first straight portion, the second supporting arm includes a second straight portion and a second bent portion, the second bent portion is formed at one end of the second straight portion, and a second groove is provided on the second straight portion, the first bent portion and the second bent portion are mirror-symmetrical, the terminal end of the first bent portion and the terminal end of the second bent portion are connected by an elastic member, and in an initial state, the first straight portion and the second straight portion are tightly pressed against each other's end faces, and the first groove and the second groove form a first circular groove; a second circular groove is provided on the fixed base, and the second circular groove is opposite to the first circular groove.

[0009] Furthermore, mounting slots are symmetrically provided on two opposite sides of the injection connecting pipe, mounting arms matching the mounting slots are symmetrically formed on two opposite sides of the fixed base, and the mounting arms are embedded in the mounting slots.

[0010] Furthermore, three concave notches adapted to the steel balls are provided on the inner peripheral wall of the limiting tube, and the three concave notches are dispersedly arranged along the axial direction of the limiting tube.

[0011] Furthermore, the elastic member is a spring.

[0012] Furthermore, one end of the first straight portion away from the first bent portion is rotatably connected to the fixed base via a bolt; and one end of the second straight portion away from the second bent portion is rotatably connected to the fixed base via a bolt.

[0013] Furthermore, the first bending portion and the second bending portion are both arc-shaped.

[0014] Furthermore, the control handle includes a core rod and a slip ring slidably arranged on the core rod, and the injection port and the electrode plug are arranged on the slip ring.

[0015] Beneficial technical effects:

[0016] The utility model discloses a mucosal incision knife, a locking component is fixed on the injection connecting tube of the mucosal incision knife, the locking component comprises a locking structure and a limiting tube, the limiting tube is fixed in the outer tube, the locking structure can move along its axial direction in the limiting tube, a first circular groove is formed on the end surface of the locking structure facing the limiting tube, a steel ball is placed in the first circular groove, a plurality of concave notches matched with the steel balls are formed on the inner peripheral wall of the limiting tube, when the control handle controls the cable to move from the proximal end to the distal end, the steel balls in the locking structure are pushed into the concave notches at different positions to complete the locking of different knife extension lengths, the knife extension length can be controlled according to actual needs, there is no need to replace the overall mucosal incision knife instrument, and the operation time and cost are effectively saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present utility model, the drawings required for describing the embodiments are briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the overall structure of a mucosal incision knife according to the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the control handle portion at the proximal end of a mucosal incision knife according to the utility model;

[0020] Figure 3 This is a schematic structural diagram of the distal end of the blade head of a mucosal incision knife according to the utility model;

[0021] Figure 4 for Figure 3 The enlarged structure diagram of part A in the middle;

[0022] Figure 5 It is a schematic diagram of the structure in which the locking structure is fixed on the injection connecting pipe;

[0023] Figure 6 It is a schematic diagram of the internal structure after the locking structure is fixed on the injection connecting pipe and the limiting pipe is removed;

[0024] Figure 7 is a structural schematic diagram of a locking structure;

[0025] Figure 8 It is a schematic diagram of the structure of the fixed base in the locking structure;

[0026] Fig. 9 It is a structural schematic diagram of the liquid injection connecting pipe;

[0027] Fig.10 It is a structural schematic diagram of a locking bracket in a locking structure;

[0028] Fig.11 It is an enlarged structural diagram when the steel ball in the locking structure is pushed into the first concave notch;

[0029] Fig.12 It is an enlarged structural diagram when the steel ball in the locking structure is pushed into the second concave notch;

[0030] Fig.13 It is an enlarged structural diagram when the steel ball in the locking structure is pushed into the third concave notch;

[0031] Fig.14 This is an enlarged structural diagram of the locking structure when the tool head is retracted after unlocking it.

[0032] Among them, 1-outer tube, 11-liquid injection cutter head, 12-liquid injection connecting tube, 121-liquid injection inlet, 122-installation slot, 13-pull cable, 2-liquid injection port, 3-electrode plug, 4-insulating sleeve, 41-inverted tooth structure, 5-locking assembly, 51-locking structure, 52-limiting tube, 521-concave slot, 53-steel ball, 54-locking bracket, 541-first support arm, 5411-first straight portion, 5412-first bent portion, 5413-first groove, 542-second support arm, 5421-second straight portion, 5422-second bent portion, 5423-second groove, 55-fixed base, 551-second circular groove, 552-installation arm, 6-elastic member, 7-core rod, 8-slip ring. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0035] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0036] Firstly, it should be noted that the terms "proximal" and "distal" used in this article refer to directions closer to and farther from a user of the device, respectively.

[0037] When performing ESD surgery, a mucosal incision knife with different blade extension lengths is required depending on the location of the lesion to be treated. However, the blade extension length of the existing mucosal incision knife is fixed and the blade extension length cannot be controlled according to actual needs. To solve the above problem, the utility model discloses a mucosal incision knife, so that the blade extension length can be controlled as needed during use.

[0038] The mucosal incision knife disclosed in this utility model is shown in FIG. Figure 1-Figure 4 , specifically comprising an outer tube 1, a control handle connected to the proximal end of the outer tube 1, preferably, the control handle comprises a core rod 7 and a slip ring 8 slidably arranged on the core rod 7, an injection cutter head 11, an injection connecting tube 12 and a cable 13 are arranged inside the outer tube 1, the distal end of the injection connecting tube 12 is connected to the injection cutter head 11, the proximal end of the injection connecting tube 12 is connected to the cable 13, an injection inlet 121 is provided on the side wall of the injection connecting tube 12, the injection port 2 and the electrode plug 3 are arranged on the slip ring 8, the proximal end of the cable 13 is connected to the electrode plug 3, the control handle can control the cable 13 to retract or push the injection cutter head 11 into or out of the outer tube 1, an insulating sleeve 4 is arranged at the distal end of the outer tube 1, the inner wall of the insulating sleeve 4 is gap-matched with the injection cutter head 11, and a reverse tooth structure 41 is formed at the proximal end of the insulating sleeve 4.

[0039] As an embodiment of the present utility model, a locking assembly 5 is fixed on the injection connecting pipe 12. Figure 5-6Specifically, the locking assembly includes a locking structure 51 and a limiting tube 52. The limiting tube 52 is fixed in the outer tube 1. The locking structure 51 can move along its axial direction in the limiting tube 52. A first circular groove is formed on the end surface of the locking structure 51 facing the limiting tube 52. A steel ball 53 is placed in the first circular groove. The first circular groove limits the steel ball 53. A plurality of concave notches 521 adapted to the steel ball 53 are provided on the inner circumferential wall of the limiting tube 52. When the control handle controls the cable 13 to move from the proximal end to the distal end, the steel ball in the locking structure 51 is pushed into the concave notches 521 located at different positions. Preferably, three concave notches 521 adapted to the steel ball 53 are provided on the inner circumferential wall of the limiting tube 52. See Figure 9-12 The three concave notches 521 are dispersedly arranged along the axial direction of the limiting tube 52, corresponding to the knife lengths of 2 mm, 3 mm and 4.5 mm in order from the proximal end to the distal end. There is no limitation on the position of the concave notches 521. The position of the concave notches 521 can be adjusted according to actual needs to correspond to different knife lengths to complete the locking of different knife lengths.

[0040] As an embodiment of the present invention, the locking structure 51 is shown in FIG. Figure 7-10, specifically includes a fixed base 55 and a locking bracket 54, the locking bracket 54 is rotatably mounted on the fixed base 55, and the fixed base 55 is fixedly mounted on the injection connecting pipe 12. Preferably, the two opposite sides of the injection connecting pipe 12 are symmetrically provided with mounting slots 122, and the two opposite sides of the fixed base 55 are symmetrically formed with mounting arms 552 adapted to the mounting slots 122, and the mounting arms 552 are embedded in the mounting slots 122; the locking bracket 54 includes a first support arm 541 and a second support arm 542, and the first support arm 541 includes a first The second support arm 542 comprises a straight portion 5411 and a first bent portion 5412, wherein the first bent portion 5412 is formed at one end of the first straight portion 5411, and a first groove 5413 is provided on the first straight portion 5411; the second support arm 542 comprises a second straight portion 5421 and a second bent portion 5422, wherein the second bent portion 5422 is formed at one end of the second straight portion 5421, and a second groove 5423 is provided on the second straight portion 5421; and an end of the first straight portion 5411 away from the first bent portion 5412 is rotatably connected to the fixed base 55 by a bolt; One end of the straight portion 5421 away from the second bent portion 5422 is rotatably connected to the fixed base 55 by a bolt, the first bent portion 5412 and the second bent portion 5422 are mirror-symmetrical, preferably, the first bent portion 5412 and the second bent portion 5422 are both arc-shaped, the terminal end of the first bent portion 5412 and the terminal end of the second bent portion 5422 are connected by an elastic member 6, preferably, the elastic member 6 is a spring, in the initial state, the first straight portion 5411 and the second straight portion 5421 are close to each other's end faces, and the first groove 5413 and the second groove 5423 forms a first circular groove; a second circular groove 551 is opened on the fixed base 55, and the second circular groove 551 is opposite to the first circular groove to ensure that the control handle controls the pull cable 13, and then controls the injection connecting tube 12 to move toward the distal end. When the end of the first straight portion 5411 forming the first bent portion 5412 and the end of the second straight portion 5421 forming the second bent portion 5422 move away from each other, the steel ball 53 loses the limit of the first circular groove and can fall vertically into the second circular groove 211, thereby releasing the lock.

[0041] The specific working process of locking different knife lengths of the mucosal incision knife disclosed in the utility model is as follows:

[0042] The cable 13 is controlled to move by the control handle, thereby causing the injection connecting tube 2 to move along the axial direction of the outer tube 1;

[0043] The slip ring 8 is pushed to move toward the distal end, so that the cable 13 drives the injection connecting tube 12 to move toward the distal end, and the locking mechanism 51 fixed on the injection connecting tube 12 also moves toward the distal end with the injection connecting tube 12. The locking mechanism 51 moves toward the distal end to the inside of the limit tube 52. When the steel ball 53 in the locking mechanism 51 is pushed into the first concave notch at the proximal end, the concave notch 521 cooperates with the steel ball 53 to complete a locking operation. Fig. 9 In this embodiment, the steel ball 53 is pushed into the first concave notch to complete the locking of the knife length of 2 mm;

[0044] When a longer knife extension length is required during surgery, the control slip ring 8 makes the injection connection tube 12 continue to move toward the distal end, and the steel ball 53 is forced to roll out of the first concave notch, so that the knife head continues to move toward the distal end. When the steel ball 53 in the locking mechanism 51 is pushed into the second concave notch close to the first concave notch at the proximal end, the concave notch 521 cooperates with the steel ball 53 to complete a locking operation. Fig.10 In this embodiment, the steel ball 53 is pushed into the second concave notch to complete the locking of the knife length of 3 mm;

[0045] When a longer knife-out length is needed, the control slip ring 8 makes the injection connection tube 12 continue to move toward the distal end, and the steel ball 53 is forced to roll out of the second concave notch, so that the knife head continues to move toward the distal end. When the steel ball 53 in the locking mechanism 51 is pushed into the third concave notch at the distal end, the concave notch 521 cooperates with the steel ball 53 to complete a locking operation. Fig.11 In this embodiment, the steel ball 53 is pushed into the third concave notch to complete the locking of the knife length of 4.5 mm;

[0046] When the cutter head needs to be retracted, the slip ring 8 is first controlled to make the injection connection tube 12 continue to move toward the distal end. Since the distal end of the outer tube 1 is provided with an insulating sleeve 4, and the proximal end of the insulating sleeve 4 is formed with a reverse tooth structure 41 (an outer diameter enlarged portion), the outer diameter of the reverse tooth structure 41 makes the free ends of the first support arm 541 and the second support arm 542 (i.e., the ends formed with the bent portions) move away from each other, and the spring is in a stretched state, so that the steel ball 53 loses the constraint of the first circular groove and vertically falls into the second circular groove 551 on the fixed base 55, see Fig.12 When the steel ball 53 falls into the second circular groove 551, the limit of the steel ball 53 fails, and then the sliding ring 8 is controlled to move the injection connecting tube 12 toward the proximal end, and the spring retracts, so that the cutter head can be retracted smoothly.

[0047] The mucosal incision knife disclosed in the utility model can achieve locking when the knife extension length is 2mm, 3mm and 4.5mm respectively. It can be understood that it is not limited to the locking of these knife extension lengths, and the designer can set the locking of different knife extension lengths according to actual needs.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] The above embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A mucosal incision knife, comprising an outer tube (1), and a control handle connected to the proximal end of the outer tube (1); an injection knife head (11), an injection connecting tube (12) and a pull cable (13) are arranged inside the outer tube (1); the distal end of the injection connecting tube (12) is connected to the injection knife head (11); the proximal end of the injection connecting tube (12) is connected to the pull cable (13); an injection inlet (121) is provided on the side wall of the injection connecting tube (12); and the control handle is provided on the side wall of the outer tube (12). A liquid injection port (2) and an electrode plug (3) are provided on the outer tube (1); the proximal end of the cable (13) is connected to the electrode plug (3); the control handle can control the cable (13) to retract or push the liquid injection blade (11) into or out of the outer tube (1); an insulating sleeve (4) is provided at the distal end of the outer tube (1); the inner wall of the insulating sleeve (4) is gap-matched with the liquid injection blade (11); the proximal end of the insulating sleeve (4) is formed with an inverted tooth structure (41), characterized in that: A locking assembly (5) is fixed on the injection connecting tube (12), and the locking assembly comprises a locking structure (51) and a limiting tube (52). The limiting tube (52) is fixed in the outer tube (1), and the locking structure (51) can move in the limiting tube (52) along its axial direction. A first circular groove is formed on the end surface of the locking structure (51) facing the limiting tube (52), and a steel ball (53) is placed in the first circular groove. A plurality of concave notches (521) adapted to the steel ball (53) are formed on the inner peripheral wall of the limiting tube (52). When the control handle controls the cable (13) to move from the proximal end to the distal end, the steel ball in the locking structure (51) is pushed into the concave notches (521) located at different positions to complete the locking of different knife-out lengths.

2. A mucosal incision knife according to claim 1, characterized in that: The locking structure (51) comprises a fixed base (55) and a locking bracket (54), wherein the locking bracket (54) is rotatably mounted on the fixed base (55), and the fixed base (55) is fixedly mounted on the injection connecting pipe (12); the locking bracket (54) comprises a first supporting arm (541) and a second supporting arm (542), wherein the first supporting arm (541) comprises a first straight portion (5411) and a first bent portion (5412), wherein the first bent portion (5412) is formed at one end of the first straight portion (5411), and a first groove (5413) is provided on the first straight portion (5411); the second supporting arm (542) comprises a second straight portion (5421) and a second bent portion (5422), wherein the second bent portion (5422) is The folded portion (5422) is formed at one end of the second straight portion (5421), and a second groove (5423) is provided on the second straight portion (5421). The first bent portion (5412) and the second bent portion (5422) are mirror-symmetrical, and the terminal end of the first bent portion (5412) and the terminal end of the second bent portion (5422) are connected by an elastic member (6). In an initial state, the first straight portion (5411) and the second straight portion (5421) are closely attached to each other with their end faces facing each other, and the first groove (5413) and the second groove (5423) form a first circular groove; a second circular groove (551) is provided on the fixed base (55), and the second circular groove (551) is opposite to the first circular groove.

3. A mucosal incision knife according to claim 2, characterized in that: The two opposite sides of the injection connection pipe (12) are symmetrically provided with mounting slots (122), and the two opposite sides of the fixed base (55) are symmetrically formed with mounting arms (552) adapted to the mounting slots (122), and the mounting arms (552) are embedded in the mounting slots (122).

4. A mucosal incision knife according to claim 2, characterized in that: The inner circumferential wall of the limiting tube (52) is provided with three concave notches (521) adapted to the steel balls (53), and the three concave notches (521) are dispersedly arranged along the axial direction of the limiting tube (52).

5. A mucosal incision knife according to claim 2, characterized in that: The elastic member (6) is a spring.

6. A mucosal incision knife according to claim 2, characterized in that: One end of the first straight portion (5411) away from the first bent portion (5412) is rotatably connected to the fixed base (55) via a bolt; and one end of the second straight portion (5421) away from the second bent portion (5422) is rotatably connected to the fixed base (55) via a bolt.

7. A mucosal incision knife according to claim 2, characterized in that: The first bending portion (5412) and the second bending portion (5422) are both arc-shaped.

8. The mucosal incision knife according to claim 1, characterized in that: The control handle comprises a core rod (7) and a slip ring (8) slidably arranged on the core rod (7); the liquid injection port (2) and the electrode plug (3) are arranged on the slip ring (8).

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