WO2022111107A1

WO2022111107A1 - Medical catheter and medical device comprising same

Info

Publication number: WO2022111107A1
Application number: PCT/CN2021/123713
Authority: WO
Inventors: 王雄伟; 朱鑫建; 王幸敏
Original assignee: 微创优通医疗科技（上海）有限公司; 微创优通医疗科技(嘉兴)有限公司
Priority date: 2020-11-26
Filing date: 2021-10-14
Publication date: 2022-06-02
Also published as: CN114533209A

Abstract

A medical catheter (3), comprising an outer catheter body section (302), an outer catheter bending section (304), and an outer catheter head section (305), and further comprising a support portion (303) and a passage (3021). A medium is injected into a storage cavity (3032) inside the support portion (303) by means of the passage (3021), so that the support portion (303) expands; or, the medium is extracted out from the storage cavity (3032) by means of the passage (3021), so that the support portion (303) shrinks. Also disclosed is a medical device comprising the medical catheter (3), comprising an inner catheter (2) used in cooperation with the medical catheter (3), and a handle. A distal end of the inner catheter (2) enters the handle from a channel of the handle and passes through the medical catheter (3) to extend out of the distal end of the medical catheter (3). By providing the support portion (303), the stability of the medical device is enhanced; the passage (3021) is used to inject the medium into the storage cavity (3032) inside the support portion (303), so that the support portion (303) expands and drives the entire medical catheter (3) to move and fit an intestinal wall; and the support portion (303) is used to support an intestinal space, so that the distance between the inner catheter (2) and papilla is increased, and both space and stability are provided for the operation of the inner catheter (2).

Description

Medical catheters and medical devices containing the same

technical field

The present invention relates to the technical field of medical devices, and in particular, to a medical catheter and a medical device including the catheter.

Background technique

【Introduction to the technique of peroral choledochoscopy】

Cholangioscopy and choledochoscopy are widely used in clinical practice, and have become one of the most important diagnostic tools and treatment methods for intrahepatic and extrahepatic biliary tract diseases and special circumstances. They have also become the most important minimally invasive techniques for biliary surgery and liver surgery. one. In general, choledochoscopy techniques can be divided into two categories according to the path of the lens, the artificial channel and the natural orifice. The former type of the artificial channel can include T-tube sinus, percutaneous transhepatic and intraoperative choledochoscopy, etc. The latter type of natural orifice access path mainly refers to the technique of transoral choledochoscopy.

【Introduction to bile duct mirror mirror】

Cholangio-motheroscope is the most classic technique of peroral choledochoscopy. The technique is to first perform duodenal papillotomy with the mother scope (duodenoscope), and then insert the daughter scope (about 3.5 mm in diameter through the Oral choledochoscope) is inserted into the common bile duct through the instrument channel of the parent endoscope, and can perform extrahepatic bile duct examination, tissue biopsy and stone removal. The advantage of this technique is that the lens is inserted through the natural channel, no surgery is required, and the trauma is minimal.

The use of the above-mentioned bile duct mirror mirror is as follows:

The mother endoscope (duodenoscope) is inserted through the mouth;

The mirror body of the mother mirror passes through the stomach and through the pylorus to the duodenum;

If the nipple is found in the descending duodenum, use a cutting knife to incise the nipple or dilate the opening of the nipple with a dilation balloon;

Insert the mirror body of the sub mirror (a transoral choledochoscope with a diameter of about 3.5mm) from the instrument channel entrance of the parent mirror;

The sub-lens end protrudes from the outlet of the instrument channel of the parent mirror, and is inserted into the duodenal papilla to enter the bile duct or pancreatic duct;

After the sub-scope finds the tumor or calculus, the biopsy forceps or laser fiber is inserted through the instrument channel of the sub-scope for biopsy or laser lithotripsy.

【Technical Problems Existing in the Prior Art】

The above-mentioned cholangioscopy can realize the inspection and treatment of the biliopancreatic duct under direct vision. However, because of the need to cooperate with each other between two sets of mirrors (sub-mirror and main mirror), the combination of technical principles brings the problem of high operational difficulty. The specific problems are as follows:

(1) Insufficient stability: the distal end of the parent mirror is suspended near the nipple. Since the intersection of the axial direction of the common bile duct and the descending duodenum is at an acute angle, the mirror must be reversed in a J-shape when it reaches the descending duodenum. Only then can the duodenal papilla be aligned, and the distal end of the parent mirror has no support, and the distal position of the parent mirror is prone to move due to the influence of intestinal peristalsis, together with the head end of the mirror body of the child mirror inside the instrument channel of the parent mirror. Displacement will also occur, and the sub-mirror will not be able to continue to advance in the direction of the common bile duct because it has no support, which affects the surgical operation.

(2) Insufficient lighting. The sub-lens end has limited space for light source arrangement, and the light source close to the sub-mirror cannot illuminate the stomach in a large space, making it difficult to use the sub-mirror independently to enter the stomach to find the pylorus.

(3) High difficulty of operation: The handle for operating the sub-mirror and the handle for operating the mother mirror need to be closely coordinated by two senior doctors, so as to realize the adjustment of the distance between the two sets of handles, so the operation is extremely difficult and complicated.

(4) Cross-infection between patients is prone to occur: in order to change the advancing direction of the sub mirror relative to the parent mirror, a forceps lifter is installed at the head end of the existing parent mirror, and the forceps lifter can provide a baffle effect. However, the structure of the above-mentioned forceps lifter is complicated and difficult to sterilize. In order to solve the above problems, a disposable mother mirror has also been designed, but the use cost of this kind of disposable mother mirror is relatively high.

SUMMARY OF THE INVENTION

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a medical catheter and a medical device including the same, so as to solve one or more problems in the prior art.

For achieving the above object, technical scheme of the present invention is as follows:

The medical catheter includes an outer tube main body section, an outer tube curved section and an outer tube head section, the proximal end of the outer tube head section is connected with the distal end of the outer tube curved section, and the proximal section of the outer tube curved section is connected to The distal end of the outer tube main body section is connected, the proximal end of the outer tube main body section is connected with the handle, and further includes a support part, the support part is at least one and is arranged at the distal end of the outer tube main body section; The main body section of the outer tube also has a passage, the distal end of the passage is connected with the support portion, and the proximal end of the passage is connected with the handle.

Further, the first center of the support portion is not concentric with the second center of the outer tube main body segment, and the non-centering causes the support portion to have a channel connected to the passage on the outer tube main body segment. or multiple connections.

Further, an opening is provided on the outer tube head section, and the opening is arranged along the axial direction of the outer tube head section.

The medical device includes the above-mentioned medical catheter, an inner tube and a handle used together with the medical catheter, the proximal end of the medical catheter is connected to the handle, and the proximal end of the inner tube is also connected to the handle, so The distal end of the inner tube enters the handle from the passage of the handle and penetrates the medical catheter to extend from the distal end of the medical catheter.

Further, the handle includes a handle body, the handle body has a channel hole and an inner tube connector, the handle body is used for installing a medical catheter, the distal end of the inner tube is connected with the inner tube connector, and the proximal end of the inner tube is connected to the inner tube connector. Enter the handle body through the passage hole and cooperate with the medical catheter;

Further, an outer tube bending mechanism, the outer tube bending mechanism is arranged inside the handle body, and the outer tube bending mechanism is used to control the curvature of the medical catheter;

Further, an inner tube bending mechanism is also provided inside the handle body, and the inner tube bending mechanism is used to control the curvature of the inner tube.

Further, the outer tube bending control mechanism includes: a first rotating part; a first moving part, the first moving part is connected with the first rotating part, the rotating part is given a rotating pair and passes through the moving part enabling movement between the first position and the second position;

An outer tube pull wire, the distal end of the outer tube pull wire is connected with the movable part, and the proximal end of the outer tube pull wire extends into the medical conduit and is connected with the proximal end of the medical conduit.

Further, the inner tube control bending mechanism includes at least one set of control components, and the control components include:

A second rotating part, the second rotating part is rotatably arranged in the handle body.

the first elastic part is connected with the second rotating part, the rotating part is endowed with a rotating pair and realizes the movement between the third position and the fourth position through the first elastic part;

At least one inner tube pull wire, the proximal end of the inner tube pull wire is connected with the elastic member, and the distal end of the inner tube pull wire extends into the inner tube and is connected with the proximal end of the inner tube.

Further, the handle also includes an outer-control-bend self-locking mechanism, and the outer-control-bend self-locking mechanism includes:

a pressing part, the pressing part is arranged in the handle body;

A third rotating part, the third rotating part is rotatably disposed in the handle body, and when the pressing part is pressed, the third rotating part can rotate relative to the handle body and be connected with the first handle body. The rotating part is snapped.

Further, the inner control and bending mechanism further includes a wheel baffle, the wheel baffle is arranged in the handle body, and the control component is located on one side and/or both sides of the wheel baffle.

Further, the inner control and bending mechanism further includes at least two spring piece positioning plates, and adjacent spring piece positioning plates are spaced apart and fixed on one side and/or both sides of the wheel baffle plate. A spring piece sliding groove for reducing the friction force of the first elastic piece is formed between the adjacent spring piece positioning plates.

Further, the handle also includes an inner control curve self-locking mechanism disposed inside the handle body, and the inner control curve self-locking mechanism includes:

a fourth rotating part, the fourth rotating part is rotatably arranged in the handle body;

axle seat;

A pair of locking pieces, the pair of locking pieces are rotatably arranged on the axle seat, and the proximal end of each locking piece is connected with the fourth rotating part, after the fourth rotating part is given a rotating pair The distal ends of the pair of locking pieces are driven to be closed relative to each other so as to hold the second rotating part.

Further, a second elastic piece is arranged between the distal ends of the pair of locking pieces, and the second elastic piece enables the distal ends of the pair of locking pieces to be relatively open to release the second rotation department.

Further, the handle also includes an inner-control-bend self-locking mechanism disposed outside the handle body, and the inner-control-bend self-locking mechanism includes:

a fixed shaft, the fixed shaft is connected with the second rotating part;

a fifth rotating part, the fifth rotating part is rotatably arranged on the fixed shaft;

a spacer, the spacer is in clearance fit with the second rotating part and is placed inside the fifth rotating part; when the fifth rotating part is applied with a rotating pair, the spacer is rotated by the fifth rotating part The second rotating part is pressed against the second rotating part in the radial direction.

Further, an inner tube locking mechanism disposed outside the handle body is also included, and the inner tube locking mechanism restricts the movement of the inner tube relative to the medical catheter.

The inner tube locking mechanism includes:

a first fixed part and a first rotating part connected with the first fixed part;

A clamping part having a clamping hole through which the inner tube passes and provided between the first fixed part and the first rotating part, when the first rotating part is given a rotating pair The clamping part can be rotated and driven relative to the first fixing part, so that the diameter of the clamping hole can be changed in the radial direction.

Further, the clamping portion is a single and elastic tubular structure, and the clamping hole is provided through the tubular structure.

Further, the clamping part is an adjustable clamping assembly composed of multiple clamping sheets, and the adjustable clamping assembly is driven by the first rotating part to move as a whole to open and close.

Further, the first rotating part has a first connecting part, and one side of each clamping piece is provided with a second connecting part corresponding to the first connecting part. When the first rotating part rotates, The first connecting part drives the second connecting part to move along the moving path of the first connecting part.

Further, the first fixing part has a third connecting part, and the other side of each clamping piece is provided with a fourth connecting part. When the third connecting part rotates, the third connecting part moves along the The moving path of the fourth connection portion moves.

Further, the first connecting portion is a first sliding groove provided on the first fixing portion, and the second connecting portion is a first protrusion extending along one side of the clamping piece.

Further, the third connecting portion is a second protrusion disposed on the clamping piece, and the fourth connecting portion is a second sliding groove corresponding to the second protrusion disposed on the first rotating portion.

Further, the plurality of clamping pieces constituting the adjustable clamping assembly are evenly distributed along the circumferential direction, and the adjacent clamping pieces are partially tangent and form the same angle, so that the adjustable clamping assembly can be radially opened and closed. During movement, there is no gap between each clamping piece.

Further, the inner tube locking mechanism includes:

The second fixed part and the second rotating part hinged with the second fixed part are connected by a fastening device.

Further, the inner tube locking mechanism includes:

a first part, the first part is connected with the handle body, and a hole is opened on the first part;

The second part, the second part covers the moving end of the inner tube and can be clamped with the first part.

Compared with the prior art, the beneficial technical effects of the present invention are as follows

The stability is enhanced. By arranging a support part at the distal end of the main body section of the outer tube, the storage cavity inside the support part is filled with a medium through the passage, so that the support part expands and drives the whole section of the medical catheter to move and stick to the intestinal wall, Using the support part to open the intestinal space increases the distance from the inner tube to the nipple, providing space and stability for the operation of the inner tube.

Further, the head section of the outer tube is provided with a light source, and the medical catheter light source is used in conjunction with the inner tube light source to illuminate the large stomach space, which overcomes the problem of insufficient light in the stomach space without increasing the outer diameter of the inner tube.

Further, without changing the outer diameter of the inner tube, the inner diameter of the first passage is enlarged, and the cross-sectional area of the first passage is doubled, so that a biopsy forceps with an outer diameter of 1.5 mm can be used in the first passage. In this way, the occlusal force of the biopsy forceps is increased, the sampling volume is greatly improved, the sampling frequency is reduced, and the use range of the instrument is expanded.

Further, the second passages serving as the mounting circuit and the medium have independently used cavities, so that the flow rate of the medium passing through is larger, and the passages are not affected by each other.

Further, the operation difficulty is reduced, the handle is reduced from the original two handles to only one handle, and the user can operate it by one person. The caliper lifter turntable is given a rotating pair, and the caliper lifter pull rod converts the rotating pair into a moving pair in which the caliper lifter slider reciprocates in the sliding groove of the caliper lifter slide plate. During the moving process, the slider drives the proximal end of the medical catheter to bend through the pull wire of the outer tube, so that the proximal end of the medical catheter provides a baffle effect when bending, thereby changing the advancing direction of the inner tube matched with the medical catheter, During the process of entering the endoscope into the duodenum, the original direct view direction is changed to the side view direction, so that the inner tube can be aligned with the nipple located on the lateral wall of the descending part of the duodenum and continue to enter the direction of the common bile duct.

Further, an inner tube control bending mechanism is arranged inside the handle, and the inner tube control bending mechanism has two sets of control components, each set of control components respectively controls two pull wires, so that the inner tube bending section of the inner tube can be bent in two directions, and then Two sets of control parts are used to realize the bending of the proximal end of the inner tube in four directions, so that the inner tube can enter the stomach from the esophagus through different bending sections, and then enter the duodenum through the pylorus.

Further, in order to avoid friction between the lower disc spring sheet and the casing or other parts in the inner control bending mechanism, the inner control bending mechanism is also provided with a lower disc spring sheet positioning plate, between the lower disc spring sheet positioning plates. A sliding groove for the spring sheet of the lower wheel disc is formed so that the spring sheet can slide along the sliding groove. At the same time, a wheel baffle is set in the inner control bending mechanism to cover the positioning plate of the upper wheel spring sheet, so as to avoid unnecessary friction caused by the contact of the upper wheel cable with other parts.

Further, an outer tube-controlled bend locking mechanism is set in the handle, and the outer tube-controlled bend self-locking mechanism moves downward when the spring pin is pressed, so that the pin head of the spring pin presses the limit rod, so that the The limit rod rotates along the limit buckle and contacts the forceps lifter turntable, thereby restricting the rotation of the forceps lifter turntable, so as to realize the self-locking of the medical catheter at any bending degree.

Further, an inner tube-controlled bend locking mechanism is also provided inside the handle, and the inner tube can be locked relative to the medical catheter in any direction of up, down, left or right by using the inner tube-controlled bend self-locking mechanism. The inner tube-controlled bending locking mechanism has two structures respectively arranged on the outside or inside of the handle body, one of which is to use the rotating part to make the locking piece of the pressing rod part rotate relative to the axis, so that the adjacent The distal ends of the locking pieces are relatively closed and respectively hold the upper wheel disc and the lower wheel disc, so as to realize the self-locking of the inner tube in any direction. Another structure is to rotate the locking knob to drive the rotation limit block to rotate, and after the rotation limit block rotates along the surface, the fixed limit block is subjected to the pressing force in the axial direction to realize axial movement. A first locking washer is arranged on the back of the device, the first locking washer is squeezed and presses the lower wheel in the axial direction, and the knob of the lower wheel is moved by the squeezing force. The inner diameter of the first locking washer is gradually reduced and holds the shaft end of the lower wheel disc so that it cannot rotate. At the same time, after the knob of the lower wheel is squeezed, the shaft end of the lower wheel moves in the axial direction and contacts the knob of the upper wheel, so that the inner diameter of the second locking washer at the knob of the upper wheel shrinks radially and holds the upper wheel tightly. the shaft end of the disc, thereby locking the upper disc, thereby realizing the locking of the upper disc and the lower disc.

Further, an inner tube locking mechanism is also provided in the handle. The inner tube locking mechanism adopts the clamping part to rotate through the first rotating part and then uses the clamping part to apply pressure to the inner tube. It can also adopt a rotary structure or a sleeve type. The structure locks the inner tube, so that the position of the inner tube relative to the medical catheter is fixed, so as to realize the clamping and loosening of the inner tube.

Further, there is no risk of cross-infection, the product of the present invention can be used as a disposable product, the manufacturing cost of the medical catheter is much lower than that of the traditional structure, and the cost of the entire device is low, and only one set of imaging system and one endoscope image are required. The processor will do.

Description of drawings

FIG. 1 shows a schematic structural diagram of a medical catheter in a medical catheter according to an embodiment of the present invention and a medical device including the same.

FIG. 2 shows a front view of the structure of the outer tube head section in the medical catheter and the medical device including the catheter according to the embodiment of the present invention

FIG. 3 shows a schematic structural diagram of a medical catheter provided with a support part in a medical catheter and a medical device including the catheter according to an embodiment of the present invention.

FIG. 4 shows a schematic cross-sectional view of the connection between the main body section of the outer tube and the support in the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

FIG. 5 shows a schematic structural diagram of a medical catheter in an embodiment of the present invention and a medical device in a medical device including the catheter.

FIG. 6 shows a front view of an inner tube of a medical catheter according to an embodiment of the present invention and a medical device including the catheter.

FIG. 7 shows a schematic structural diagram of an inner tube head section in a medical catheter according to an embodiment of the present invention and a medical device including the catheter.

FIG. 8 is a schematic diagram showing a partial structure of a medical catheter according to an embodiment of the present invention and a head section of an inner tube in a medical device including the catheter.

FIG. 9 shows a cross-sectional view of a main body section of an inner tube in a medical catheter according to an embodiment of the present invention and a medical device including the catheter.

FIG. 10 shows a cross-sectional view of the main body section of the inner tube in another embodiment of the inner tube of the medical catheter according to the embodiment of the present invention and the medical device including the catheter.

FIG. 11 shows a schematic structural diagram of the outside of the handle in the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

FIG. 12 shows a schematic structural diagram of the inner and outer tube bending mechanism of the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

FIG. 13 shows a schematic diagram I of the partial structure of the inner tube bending mechanism in the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

FIG. 14 shows a schematic diagram II of the partial structure of the inner tube control and bending mechanism in the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

FIG. 15 shows a schematic diagram III of the partial structure of the inner tube and the bending mechanism in the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

FIG. 16 shows a schematic structural diagram I of the first embodiment of the inner tube bending mechanism in the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

FIG. 17 shows a schematic structural diagram II of the first embodiment of the inner tube bending mechanism in the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

FIG. 18 is a schematic structural diagram of the second embodiment of the inner tube bending mechanism in the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

FIG. 19 shows a schematic structural diagram of the inner tube locking mechanism in the first embodiment of the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

FIG. 20 shows a schematic structural diagram I of the second embodiment of the inner tube locking mechanism in the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

Fig. 21 shows a schematic view II of the structure of the inner tube locking mechanism in the second embodiment of the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

Fig. 22 shows a schematic view III of the structure of the inner tube locking mechanism in the second embodiment of the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

23 is a schematic structural diagram of the inner tube locking mechanism in the third embodiment of the medical catheter and the medical device including the catheter according to the embodiment of the present invention.

FIG. 24 shows a schematic structural diagram of the inner tube locking mechanism in the fourth embodiment of the medical catheter and the medical device including the catheter according to the embodiment of the present invention

FIG. 25 shows a schematic diagram of the medical catheter inserted into the body through the mouth in the medical device according to the embodiment of the present invention.

Fig. 26 shows a schematic diagram of searching for pylorus in the stomach by a medical catheter in a medical device according to an embodiment of the present invention.

Fig. 27 shows a schematic diagram of the medical catheter passing through the pylorus in the stomach in the medical device according to the embodiment of the present invention.

FIG. 28 shows a schematic diagram of the medical catheter entering the duodenum in the medical device according to the embodiment of the present invention.

Fig. 29 shows a schematic diagram of the support part in the medical device according to the embodiment of the present invention opening the inner space of the intestinal tract.

Fig. 30 shows a schematic diagram of the curved section of the outer tube being bent to find the nipple and inserting the guide wire in the medical device according to the embodiment of the present invention.

Fig. 31 shows a schematic diagram of inserting the head end of the inner tube into the nipple in the medical device according to the embodiment of the present invention.

Fig. 32 shows a schematic diagram of the biopsy forceps protruding through the inner tube instrument channel in the medical device according to the embodiment of the present invention.

Marked in the accompanying drawings: 1. Main body of handle;

101, inner tube locking mechanism; 10100, locking nut; 101001, inner threaded hole; 10101, inner tube locking gasket; 101010, first clamping hole; 10102, locking seat; 101020, outer thread; 10103, The first limit buckle; 10104, the clamping seat; 10105, the rotating plate; 101051, the handle installation port; 101052, the first sliding groove; 101053, the rotating plate through hole; 10106, the anti-rotation buckle groove; ; 10108, fixed plate; 101081, second sliding groove; 101082, fixed plate through hole; 10109, clamping piece; 101091, first protrusion; 101092, second protrusion; 101093, second clamping hole; 10110, Clamping end; 10111, hinge; 10112, fixed end; 10113, clamping handle; 10114, clamping mouth; 10115, sleeve; 10116, sleeve; 10117, first tooth; 10118, second tooth.

102. External control bending self-locking mechanism; 10201, spring pin; 10202, limit rod; 102021, tooth; 10203, second limit buckle;

103, left housing; 104, right housing; 105, lifter handle; 106, lifter turntable; 1061, tooth slot; 107, upper wheel knob; 108, lower wheel knob; 109, locking knob ; 110, three-way piece; 111, balloon valve; 112, clamp lifter pull rod; 113, clamp lifter pull rod; 114, slider buckle; 115, clamp lifter slider; 116, clamp lifter slide plate ;1161, Snap sliding slot; 1162, cable hole; 117, inner tube channel; 118, lower wheel flange; 119, lower wheel; 1191, fixed shaft mounting hole; 120, fixed shaft; 121, lower wheel Spring plate; 122, lower plate spring plate positioning plate; 123, lower plate spring plate sliding groove; 124, lower plate cable; 125, lower plate cable buckle; 126, upper plate flange; 127, upper plate Roulette; 128, upper roulette spring plate; 129, upper roulette spring plate positioning plate; 130, upper roulette spring plate sliding groove; 131, upper roulette cable; 132, upper roulette cable buckle; 133, wheel Disc baffle; 134, Inner pipe connection; 135, Outer pipe transition connection; 136, Cable cover plate; 137, Water injection pipe; 138, Suction port; 139, Lock nut; 140, Rotation limit block; 1401, convex part; 141, fixed limit block; 1411, first surface; 1421, first locking washer; 1422, second locking washer; 143, passage hole; 144, pressing rod; 145, locking Handle; 146, axle seat; 1461, axle; 147, locking piece; 148, spring;

2. Inner tube; 201. Main body section of inner tube; 2011, First hole; 2012, Second hole; 2013, First opening; 2014, Second opening; 2031, the third hole; 2032, the first installation port; 2033, the fourth hole; 2034, the second installation port; 2035, the camera assembly; 2036, the first light source; 204, the first tube; 2041 , first cavity; 2051, second tube; 2052, second cavity; 2053, third tube; 2054, third cavity; 206, fourth tube; 207, first outer layer; 208, second outer layer; 209 , the fifth hole;

3. Medical catheter; 301, outer tube pull wire; 302, main body section of outer tube; 3021, access; 3022, lumen; 3023, second center; 303, support part; 3031, first center; 3032, accumulation cavity; 304 305, the outer tube head section; 3051, the second wire hole; 3052, the second light source; 3053, the inner tube mounting hole; 3054, the opening; 306, the third wire hole.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the following describes the medical catheter and the medical device including the catheter proposed by the present invention in further detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in a very simplified form and all use inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention. For the purpose, features and advantages of the present invention to be more clearly understood, please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc. shown in the drawings in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the implementation of the present invention. Therefore, it does not have technical substantive significance. Any modification of structure, change of proportional relationship or adjustment of size should still fall within the scope of the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. The scope of the disclosed technical content can be covered.

In order to describe the structure of the above-mentioned medical catheter and the medical device containing the same more clearly, the present invention defines the terms "distal end" and "proximal end", which are special terms in the field of medical devices, specifically, "distal end" Indicates the end that enters the human body away from the operator during the operation, and "proximal end" refers to the end that is close to the operator during the operation. Taking Figure 5 as an example, the left side of Figure 5 is the proximal end, and the right side of Figure 5 is the distal end.

The specific structure of the medical catheter 3 is described below:

Referring to FIGS. 1 to 5 , the medical catheter 3 includes an outer tube body section 302 , an outer tube curved section 304 and an outer tube head section 305 , and the proximal end of the outer tube head section 305 is connected to the distal end of the outer tube curved section 304 , the proximal section 304 of the outer tube curved section is connected with the distal end of the outer tube main body section 302, the proximal end of the outer tube main body section 302 is connected with the handle, and the

a support portion 303, at least one support portion 303 is disposed at the distal end of the outer tube main body section 302, and a storage cavity 3032 is provided inside the support portion 303;

A passageway 3021, the passageway 3021 runs through the main body section 302 of the outer tube, the distal end of the passageway 3021 communicates with the storage cavity 3032, and the proximal end of the passageway 3021 is connected with the handle;

The support part 303 is injected with the medium into the storage cavity 3032 through the passage 3021, so that the support part 303 is expanded or the medium is drawn out from the storage cavity 3032 through the passage 3021, so that the support part 303 is contracted. Specifically, the support part 303 in the embodiment of the present invention Choose a balloon.

Please refer to FIG. 11 , the tee 110 is installed on the right casing 104 of the handle main body 1 , and the tee 110 is used to communicate with the water or gas path, so as to facilitate the introduction of liquid or gas into the support portion 303 .

Specifically, please continue to refer to FIGS. 3 to 5 , the first center 3031 of the support portion 303 is not concentric with the second center 3023 of the outer tube main body section 302 . The non-concentricity causes the support portion 303 to have one or more connecting ends connected to the passage 3021 on the outer tube main body section 302, and the connecting ends are sealedly connected to the mouth of the passage 3021. In this embodiment, there is only one connecting end. It can be a connection port to facilitate communication with the passage 3021 . The non-concentricity makes the support portion 303 and the outer tube main body section 302 eccentrically arranged, and the eccentric arrangement enables the support portion 303 to expand and support only from one direction when inflated, and the support portion 303 expands and drives the entire section of the medical catheter to move And close to the intestinal wall, the support part 303 is used to open the intestinal space to increase the distance from the inner tube 2 to the nipple, which provides space and stability for the operation of the inner tube 2 .

Further, please continue to refer to FIG. 4 and FIG. 5 , a third pulling wire hole 306 and a lumen 3022 are opened on the main body section 302 of the outer pipe. The lumen 3022 is used for the passage of the inner pipe 2 and the outer pipe. A second wire hole 3051 is also formed on the head section 305 , and a wire hole is also formed in the curved section 304 of the outer tube corresponding to the third wire hole 306 and the second wire hole 3051 for the outer tube wire 301 to pass through. Please refer to Figure 2. An opening 3054 and an inner tube mounting hole 3053 are provided on the outer tube head section 305. The opening 3054 is opened along the axial direction of the outer tube head section 305. The inner tube mounting hole 3053 and the opening 3054 communicate with each other, and the opening 3054 can be used to make The inner tube 2 can be bent at a larger angle in a certain direction, which is convenient for the user to operate.

Further, please continue to refer to FIG. 4 and FIG. 5 , a second light source 3052 is also provided on the outer tube head section 305 of the medical catheter 3 , the second light source 3052 is preferably an LED or an optical fiber, and the light source makes the inner tube 2 When entering the stomach together with the medical catheter 3, it can illuminate the large space of the stomach. The outer tube bending section 304 and the outer tube main body section 302 are also provided with wire holes through which the power supply wires pass, so as to connect the LEDs or optical fibers to provide electric power for them through the wires. The specific arrangement of the wire holes and the specific structure of the second light source 3052 belong to the well-known technology of those skilled in the art, and will not be described in detail in the present invention.

The specific structure of the inner tube 2 is described below as follows:

Referring to FIGS. 6 to 9 , the inner tube 2 includes an inner tube main body section 201 , an inner tube bending section 202 and an inner tube head section 203 . The distal end of the inner tube main body section 201 is connected to the proximal end of the inner tube bending section 202 . , the distal end of the inner tube bending section 202 is connected with the proximal end of the inner tube head section 203, and the inner tube main body section 201 has:

The first passage is used to configure the medical instrument; it is used for the passage of the medical instrument and can move along the first passage. In the embodiment of the present invention, the medical instrument adopts a biopsy forceps.

and at least one second passage arranged outside the first passage, the second passage is used to configure a medium and pass through the circuit, and the medium is specifically a liquid medium or a gas medium.

Specifically, the inner tube main body section 201 adopts a flexible main body tube, and the inner tube bending section 202 adopts a multi-lumen tube. The flexibility of the multi-lumen tube is softer than that of the flexible main body tube, and the cross-section of the multi-lumen tube is similar to The flexible body tube is the same. In other embodiments of the present invention, the inner tube bending section 202 may also adopt a bending section in which a plurality of bending sections are connected to each other, and the structure of the multi-lumen tube or the bending section adopts the prior art.

Both the first passage and the second passage are arranged along the axial direction of the inner tube main body section 201 . Both the first passage and the second passage are hole structures and/or pipe structures passing through the main body section 201 of the inner pipe.

The specific structure of the first passage is described below as follows:

Referring to FIG. 9 , the first passage is a first hole 2011 penetrating through the main body section 201 of the inner tube in the axial direction. In the embodiment of the present invention, the first hole 2011 is a circular hole, and in other implementations of the present invention In this example, the first hole 2011 can be any shape except the circular hole.

Further, please refer to FIG. 7 , in another optional embodiment of the present invention, the first passage is a first tube 204 disposed through the main body section 201 of the inner tube, wherein the first tube 204 is embedded in the In the first hole 2011, the inside of the first tube 204 forms a first cavity 2041. In this embodiment, the first hole 2011 is used to install the first tube 204, and the first cavity 2041 is used to pass instruments and For equipment activities.

The specific structure of the second passage is described below as follows:

Referring to FIGS. 8 and 9 , the second passage makes the inner tube body section 201 have an open structure, and the open structure has an opening along the outer side of the inner tube body section 201 , and the opening radially faces the inner tube body section 201 center depression. Specifically, in the embodiment of the present invention, there are two openings, namely the first opening 2013 and the second opening 2014 , wherein the first opening enables the second surface 2015 to be formed on the main body section 201 of the inner tube.

The outer side of the main body section 201 of the inner tube is covered with at least one outer layer structure. In the embodiment of the present invention, the outer layer structure is a first outer layer 207 and a second outer layer 208, wherein the first outer layer 207 is a braided layer. , the second outer layer 208 is specifically a skin layer. The first outer layer 207 covers the outer side of the main body section 201 of the inner tube, and the second outer layer 208 covers the first outer layer 207 . When the outer side of the inner tube main section 201 is covered by the first outer layer 207 , the inner side of part of the first outer layer 207 closes the first opening 2013 and the second opening 2014 to form a closed area.

Please continue to refer to FIG. 8 , in another optional embodiment of the present invention, the second passage may also be a third pipe 2053 disposed in the first opening 2013 and a second pipe 2051 disposed in the second opening 2014, The third tube 2053 has a third cavity 2054 for medium circulation, and the second tube 2051 has a second cavity 2052 for setting the circuit.

The second tube 2051 has a side that fits with the recessed portion of the opening and has a matching shape. Specifically, the second tube 2051 and the third tube 2053 are preferably designed in an elliptical shape, so that the second cavity 2052 inside the second tube 2051 and the third cavity 2054 in the third tube 2053 also form elliptical cavities, Therefore, when the second passage is used to introduce gas or liquid, the gas volume and the liquid flow rate are larger.

The above-mentioned first passage and second passage are arranged independently of each other, so that the second passage leading to the circuit, liquid or gas no longer occupies the space where the first passage is opened in the main body section 201 of the inner tube, so that the first passage, namely the first hole 2011, is not located. The inner diameter of the hole or the inner diameter of the first tube 204 can be set larger, and without changing the outer diameter of the main body section 201 of the inner tube, the inner diameter of the first hole 2011 or the inner diameter of the first tube 204 can be enlarged to 1.2mm～2.8mm (the channel in the original traditional structure is only 1.2mm), preferably, the diameter of the first hole 2011 is 1.8mm, and the area is nearly doubled, so that the conventional 1.5mm outer diameter biopsy forceps can be Flexible access to use, and greatly increase the amount of sampling, reduce the number of sampling. And expanded the scope of use of instruments, such as stents, stone baskets and so on.

Further, please refer to FIG. 9 , at least one second hole 2012 is formed on the inner tube main body section 201 , the inner diameter of the second hole 2012 is smaller than the inner diameter of the first hole 2011 , and the second hole 2012 is used to pass through The pull wire that can control the bending of the inner tube bending section 202, in the embodiment of the present invention, the number of the second holes 2012 is four, so that the inner tube bending section 202 of the inner tube 2 can be controlled by the handle and can be controlled along the upper, lower, left, Control is performed on the right. Specifically, the pull wires in the second hole 2012 are configured as the upper wheel pull wire 131 and the lower wheel pull wire 124 . Correspondingly, in another embodiment of the present invention, the second hole 2012 can also be replaced by a fourth tube 206, and a pulling wire is arranged in the tube of the fourth tube 206, so as to also realize the passage of the inner tube bending section 202 through the handle And control along the up, down, left and right.

Further, please refer to FIG. 2 , the inner tube head section 203 defines a third hole 2031 , and the third hole 2031 penetrates through the inner tube head section 203 and communicates with the second passage, specifically, communicates with the second cavity 2052 in the second tube 2051 . The fourth hole 2033 penetrates through the inner pipe head section 203 and is used for communicating with the first passage, specifically, communicating with the first cavity 2041 in the first pipe 204 . A first installation port 2032 and a second installation port 2034 are respectively opened in the inner tube head section 203 , wherein the first installation port 2032 is used for installing the camera assembly 2035 , and the second installation port 2034 is used for installing the first light source 2036 .

Referring to FIG. 10 , in another optional embodiment of the present invention, the second passage is disposed inside the first passage. Specifically, a fifth hole 209 is opened on the main body section 201 of the inner tube, and the first passage is specifically the first tube 204 disposed in the fifth hole 209, and the first tube 204 has a first cavity 2041 for the passage of The second passage is specifically the second tube 2051 disposed in the fifth hole 209 and the inner space of the fifth hole 209 except the first tube 204 and the second tube 2051, wherein the second tube 2051 is used as a second passage for installing circuits/wires, and the space in the hole except the first pipe 204 and the second pipe 2051 is used as another second passage for the delivery of liquid or gaseous media. The space in the hole can be used as a free cavity to improve the space utilization rate of the entire inner tube main section 201, so that the inner diameter of the first tube 204 can be expanded to 1.8 mm without expanding the overall outer diameter of the inner tube 2, so as to obtain The same technical effect as the previous embodiment.

The specific structure of the handle is described below:

Referring to FIG. 11 , the handle according to the embodiment of the present invention includes:

The handle body 1, the handle body 1 has a channel hole 143, the distal end of the medical catheter 3 is connected to the handle body 1 through the outer tube transition connector 135, and the inner tube 2 enters the handle body 1 through the channel hole 143. And enter the medical conduit 3 from the distal end of the medical conduit 3 to be used in cooperation with the medical conduit 3 .

Specifically, please refer to FIG. 10 , the handle body 1 is composed of a left casing 103 and a right casing 104 being fixedly connected.

The specific structure of the outer control bending mechanism is described below:

Please refer to FIG. 11 and FIG. 12 , the handle further includes an outer tube bend control mechanism, the outer tube bend control mechanism is arranged inside the handle body 1 , and the outer tube bend control mechanism is used to control the curvature of the medical catheter 3 , Specifically, the curvature of the proximal end of the medical catheter 3 is controlled.

Please continue to refer to Figure 11 and Figure 12, the outer tube control bending mechanism includes:

the first rotating part;

a first movable part, the first movable part is connected with the first rotating part, the rotating part is given a rotating pair, and the movement between the first position and the second position is realized by the movable part;

The outer tube pulling wire 301, the distal end of the outer tube pulling wire 301 is connected to the movable part, and the proximal end of the outer tube pulling wire 301 extends into the medical catheter 3 and is connected with the proximal end of the medical catheter 3.

The specific structure of the first rotating part in the outer tube bending mechanism is described below:

Please refer to FIG. 16 , specifically, in the handle according to the embodiment of the present invention, the first rotating part specifically adopts a clamp lifter handle 105 and a clamp lifter turntable 106 , wherein the clamp lifter handle 105 and the clamp lifter turntable are 106 snaps in and remains coaxial.

The specific structure of the first movable part in the outer control bending mechanism is described below:

Please continue to refer to FIG. 11 , FIG. 12 and FIG. 16 , the first movable part includes a clamp lifter rod 113 , a clamp lifter slider 115 and a clamp lifter slide 116 , and one end of the clamp lifter rod 113 passes through the clamp lifter The clamp pull rod buckle 112 is connected to the clamp lifter turntable 106 , the other end of the clamp lifter pull rod 113 is connected to the clamp lifter slider 115 through the slider buckle 114 , and the clamp lifter slider 115 It is installed in the snap sliding groove 1161 of the tongs lifter slide 116 , and the tongs lifter slide 116 is fixedly connected to the right housing 104 through a plurality of fasteners.

Further, please refer to FIG. 12 , a wire hole 1162 is opened on one side of the buckle sliding groove 1161 , and the wire hole 1162 is located at the lower part of the caliper lifter slide 116 for the outer tube wire 301 to pass through the hole 1162 . The pulling wire hole 1162 extends into the interior of the medical catheter 3 and is connected to the proximal end of the medical catheter 3 .

The structure of the inner control bending mechanism is described below:

The inner tube bending control mechanism is also arranged inside the handle main body 1, and the inner tube bending control mechanism is used to control the curvature of the inner tube 2. The inner tube bending control mechanism in the handle according to the embodiment of the present invention specifically controls the proximal end of the inner tube 2. The curvature in four directions: up, down, left, and right. However, as understood by those skilled in the art, according to different usage environments, the inner tube bending mechanism can also control the bending degree of only one direction in addition to multiple directions.

The inner tube control bending mechanism includes at least one set of control components, the set of control components is used to control the two directions of the proximal end of the inner tube 2, in order to realize the bending of the proximal end of the inner tube 2 in four directions: up, down, left and right. The inner tube control bending mechanism in the handle of the embodiment of the present invention adopts two sets of control components. In order to realize that the two sets of control components do not interfere with each other during rotation, the inner control and bending mechanism further includes a wheel baffle plate 133, which is fixed in the left housing 103, and the above control components are respectively arranged on the wheel plate The two sides of the baffle 133 are specifically arranged on the upper and lower sides of the roulette baffle 133 .

The control components include:

The second rotating part is rotatably disposed in the handle body 1 .

a first elastic part, the first elastic part is connected with the second rotating part, the rotating part is given a rotating pair and realizes the movement between the third position and the fourth position through the first elastic part;

At least one inner tube pull wire, the proximal end of the inner tube pull wire is connected with the elastic member, and the distal end of the inner tube pull wire extends into the inner tube 2 and is connected with the proximal end of the inner tube 2 .

The specific structure of the first set of control components in the inner tube control bending mechanism is described below:

Please refer to FIG. 13 . Specifically, the second rotating part adopts a lower wheel 119 in the handle according to the embodiment of the present invention, and the lower wheel 119 is rotatably disposed on the left casing 103 . The first elastic member is a lower disc spring 121 , the center of the lower disc spring 121 is fixed to the lower disc 119 by a fastener, and both ends of the lower disc spring 121 They are respectively welded with the distal ends of a lower wheel pull wire 124 , and the proximal end of the lower wheel pull wire 124 extends into the inner tube 2 and extends to connect with the proximal end of the inner tube 2 .

Please refer to FIG. 13 , further, in order to ensure that the lower roulette wire 124 will not bend during the movement, at least one lower roulette wire buckle 125 is provided on the left housing 103 , and the lower roulette wire buckle 125 A positioning opening for positioning the lower wheel pull wire 124 is provided in the middle for the lower wheel pull wire 124 to pass through.

Please continue to refer to FIG. 13 , further, the left housing 103 is further provided with an inner tube connector 134 , the distal end of the inner tube 2 is connected with the inner tube connector 134 , and the inner tube 2 is connected from the inner tube connector 134 It protrudes and enters the passage hole 143 into the interior of the handle body 1 . The tube body of the inner tube 2 between the channel hole 143 and the inner tube connector 134 forms an inner tube ring, and the extension and retraction of the inner tube head section 203 of the inner tube 2 can be controlled by adjusting the size of the inner tube tube ring.

Please continue to refer to FIG. 13 , further, a lower wheel baffle 118 is fixed to the left housing 103 near the lower wheel spring plate 121 , and the lower wheel baffle 118 attaches the lower wheel spring plate 121 is stuck in the gap between the lower rim 118 and the lower rim 119, and the lower rim 121 is limited to the inner side of the lower rim 118 by the There is an error in the spring sheet 121 of the lower roulette.

Please continue to refer to FIG. 13 , further, the inner control and bending mechanism further includes at least two lower disc spring plate positioning plates 122 , preferably, the lower disc spring plate positioning plates 122 in the handle according to the embodiment of the present invention are three There is a space between the adjacent lower disc spring piece positioning plates 122 and is fixed on the lower surface of the wheel disc baffle 133 , and a lower disc spring piece sliding slot 123 is formed between the adjacent lower disc spring piece positioning plates 122 . The sliding slot 123 of the lower disc spring sheet can prevent the lower disc spring sheet 121 from rubbing against the left casing 103 and other parts on the left casing 103 .

The specific structure of the second set of control components in the inner tube control bending mechanism is described below:

The second set of control components has the same structure and arrangement as the first set of control components, except that the installation methods of each structure are as follows:

Please refer to FIG. 14 and FIG. 16 , the second rotating part in the second set of control components is the upper wheel 127 ,

The upper wheel 127 is sleeved on the shaft end of the lower wheel 119 , and the shaft end of the lower wheel 119 protrudes from the shaft end of the upper wheel 127 . The upper roulette baffle 126 , the three upper roulette spring leaf positioning plates 129 and the plurality of upper roulette pull wire buckles 132 are all fixed on the upper surface of the roulette baffle plate 133 , and the upper roulette spring plate 128 is stuck on the upper roulette plate Between the rib 126 and the upper disc 127, the two ends of the upper disc spring 128 respectively extend into the upper disc spring sliding grooves 130 between the adjacent upper disc spring positioning plates 129, and the upper disc springs 128 respectively extend. Both ends of the wheel spring sheet 128 are respectively connected with the distal end of an upper wheel pull wire 131, and the proximal end of each upper wheel pull wire 131 penetrates the upper wheel pull wire buckle 132 and extends into the inner tube 2 and extends to Connect with the proximal end of the inner tube 2 .

Please continue to refer to FIG. 14 , the left housing 103 also has an inner tube channel 117 , the upper end of the inner tube channel 117 communicates with the channel hole 143 , and the lower end of the inner tube channel 117 extends into the outer tube transition connection 135.

Please refer to FIG. 15 , the inner control and bending mechanism further includes a cable cover 136 , the cable cover 136 is fixed to the upper surface of the wheel baffle 133 by fasteners, and the cable cover 136 covers all the The upper surface of the wheel baffle plate 133 is covered with the upper wheel spring plate positioning plate 129 to avoid unnecessary friction caused by the contact between the upper wheel pull wire 131 and other components, and to avoid its wear, so as to improve the upper wheel pull wire 131 service life. In addition, the cable cover plate 136 also has a limiting function, which can limit the upper wheel spring plate 128 to the inner space of the cable cable cover plate 136 .

The outer control bend self-locking mechanism 102 is described below.

In order to realize that the medical catheter 3 can be maintained at the curvature after the curvature is controlled by the outer tube control bending mechanism, the handle is further provided with an outer tube control bending self-locking mechanism 102, and the outer tube control bending self-locking mechanism 102 includes:

a pressing part, the pressing part is arranged in the handle body 1;

The third rotating part is rotatably disposed in the handle body 1 , and when the pressing part is pressed, the third rotating part can rotate relative to the handle body 1 and be engaged with the first rotating part.

Specifically, please refer to FIG. 12 , the pressing portion is specifically a spring pin 10201 , the spring pin 10201 is installed on the upper part of the right housing 104 , wherein the pin portion of the spring pin 10201 extends into the right housing 104 . The third rotating part is specifically a limit rod 10202, a second limit buckle 10203 is fixed on the right housing 104, and the limit rod 10202 is in clearance fit with the second limit buckle 10203, so that the The limit rod 10202 can rotate relative to the second limit buckle 10203 .

The use process of the above-mentioned outer tube-controlled bending self-locking mechanism 102 is as follows. When the spring pin 10201 is pressed, it moves downward, so that the pin head of the spring pin 10201 presses the limit rod 10202 to make the limit rod 10202 rotates along the second limit buckle 10203 and contacts the forceps lifter turntable 106, thereby restricting the rotation of the forceps lifter turntable 106, so as to realize the self-locking of the medical catheter 3 at any bending degree.

Please refer to FIG. 12 , in order to realize the self-locking of the proximal curved portion of the medical catheter 3 at a specific angle, a plurality of locking teeth 102021 are also provided on the side of the limit rod 10202 contacting the forceps lifter turntable 106 , and the The outer side of the clamp lifter turntable 106 contacting the limit rod 10202 is also provided with a plurality of tooth slots 1061 that engage with the locking teeth 102021, and the spacing between each locking tooth 102021 or each tooth slot 1061 can be large or small. , if the distance is large, the bending angle of the proximal end of the medical catheter 3 can be switched between large angles, such as 30°, 60°, 90° and so on. On the contrary, if a small distance is set, the bending angle of the proximal end of the medical catheter 3 can be switched between small angles. For example, 5°, 10°, 15°, etc.

The above-mentioned tooth slot structure on the forceps lifter turntable 106 and the limit rod 10202 can also be changed according to different usage conditions, for example, soft protrusions can be used to abut each other, and the present invention is not limited to The above-mentioned setting of tooth slots 1061 on the clamp lifter turntable 106 or setting of the locking teeth 102021 on the limit rod 10202 is any structure that can realize the clamp connection between the clamp lifter turntable 106 and the limit rod 10202 when they are in contact. Yes, this application does not limit this.

The specific structure of the first embodiment of the inner control bending self-locking mechanism is described below. The inner control bending self-locking mechanism is arranged inside the handle main body 1, which can realize that the inner tube 2 can be placed in any one of the upper, lower, left and right. Orientation lock.

The structure of the first embodiment of the inner control bend self-locking mechanism includes:

The fourth rotating part is rotatably disposed in the handle body 1 . Specifically, please refer to FIG. 18 , the fourth rotating part includes a pressing rod 144 and a locking handle 145 , wherein the locking handle 145 is threadedly connected with the upper end of the pressing rod 144 , and the lower end of the pressing rod 144 is connected to the The threaded holes provided on the upper part of the left housing 103 are screwed together, and the lower ends of the pressing rods 144 are respectively connected with the proximal ends of a locking piece 147. The two adjacent locking pieces 147 are adjacent to each other and pass through the same shaft 1461. The shaft seat 146 is connected, one of the locking pieces 147 is close to the outer side of the lower wheel disc 119 , and the other piece of the locking piece 147 is close to the outer side of the upper wheel disc 127 . A spring 148 is also connected between the pair of locking pieces 147 , and the distal ends of the pair of locking pieces 147 on the spring 148 can be relatively opened to release the upper wheel 127 and the lower wheel 119 .

The working process of the inner control and bending mechanism described in the first embodiment is as follows:

Rotating the locking handle 145, the locking handle 145 rotates and drives the pressing rod 144 to rotate and moves downward in a small range through the thread. The distal ends of the adjacent locking pieces 147 are relatively closed and respectively hold the upper wheel disc 127 and the lower wheel disc 119 , so as to realize the self-locking of the inner tube 2 in any direction. In the non-self-locking state, the distal ends of the adjacent locking pieces 147 can be relatively opened by the spring 148 to release the self-locking of the upper disc 127 and the lower disc 119 .

The specific structure of the second embodiment of the inner control bending self-locking mechanism is described below. The inner control bending self-locking mechanism is provided outside the handle body 1 .

Referring to FIGS. 16 and 17 , the self-locking mechanism of the inner control bend in the second embodiment includes a fixed shaft 120 , one end of the fixed shaft 120 is connected to the fixed shaft installation hole 1191 of the lower wheel 119 , and the lower The wheel 119 is connected to the lower wheel knob 108 , and the upper wheel 127 is connected to the upper wheel knob 107 .

Please refer to FIG. 16 and FIG. 17 , a fifth rotating part is further included, and the fifth rotating part is rotatably disposed on the fixed shaft 120 . Specifically, the fifth rotation part is composed of a rotation limit block 140 and a fixed limit block 141 , the outer part of the rotation limit block 140 is connected to the locking knob 109 , and a convex part is provided on the lower surface of the rotation limit block 140 1401, a first surface 1411 of the fixed limit block 141 opposite to the rotation limit block 140 is incrementally formed from low to high, and the first surface 1411 enables the rotation of the rotation limit block 140 to be converted into a fixed position Axial movement of the limit block 141 . The fixed limit block 141 and the rotation limit block 140 are in clearance fit with one end of the fixed shaft 120 respectively, and the end of the fixed shaft 120 is screwed together by a locking nut 139 to avoid the rotation limit block 140 Detach from the fixed shaft 120 .

Gasket, since there are two sets of control components in the handle of the embodiment of the present invention, the two gaskets used are the first locking gasket 1421 and the second locking gasket 1422, wherein the first locking gasket 1421 is placed In the opening on the back of the fixed stop block 141, the second locking washer 1422 is disposed between the upper wheel knob 107 and the lower wheel knob 108, and the second locking washer 1422 is connected to the lower wheel wheel. The shaft end of 119 is clearance fit, and the outer diameter of the second locking washer is larger than the central hole diameter of the lower wheel knob.

The working process of the inner tube-controlled bending locking mechanism described in the second embodiment is as follows:

Please refer to FIGS. 16 and 17 , the rotation locking knob 109 drives the rotation limit block 140 to rotate, and the rotation limit block 140 rotates along the first surface 1411 , so that the fixed limit block 141 is subjected to a pressing force in the axial direction. Thus, the axial movement is realized. Since the first locking washer 1421 is provided on the back of the fixed stop block 141, the first locking washer 1421 is squeezed and presses the lower wheel circling 108 in the axial direction. The wheel knob 108 is moved by the squeezing force, and the first locking washer 1421 is compressed and deformed during the movement. shaft end so that it cannot turn. At the same time, after the lower roulette knob 108 is squeezed, the shaft end of the lower roulette wheel 119 moves axially and contacts the upper roulette knob 107, so that the inner diameter of the second locking washer 1422 at the upper roulette knob 107 radially shrinks And hold the shaft end of the upper wheel disc 127 tightly, thereby locking the upper wheel disc 127 , thereby realizing the locking of the curvature of the upper wheel disc 127 and the lower wheel disc 119 .

The inner tube locking mechanism 101 is described below.

In order to limit the further movement of the inner tube 2 relative to the medical catheter 3, the handle body 1 is also provided with an inner tube locking mechanism 101, and the inner tube locking mechanism 101 is arranged outside the handle body 1 and is close to the passage hole 143, so The structure of the inner tube locking mechanism 101 in the first embodiment is as follows:

The inner tube locking mechanism 101 includes a first fixed part and a first rotating part rotatably connected with the first fixed part, and the first rotating part is given a rotating pair to rotate relative to the first fixed part;

It also includes a clamping part, the clamping part is arranged between the first fixed part and the first rotating part, the first rotating part presses the clamping part after the rotation, and the clamping part is pressed and presses the inner tube in the radial direction .

Specifically, please refer to FIG. 19 , the first fixing part is a locking seat 10102, the first rotating part is a locking nut 10100, and one end of the locking seat 10102 has an external thread 101020, the lock The lock nut 10100 has an inner threaded hole 101001 that can be threadedly connected with the outer thread 101020, the inner threaded hole 101001 penetrates the lock nut 10100, and a through hole for the inner pipe to pass through is also provided on the lock seat 10102 , an inner tube locking washer 10101 is arranged between the locking seat 10102 and the locking nut 10100, the outer diameter of the inner tube locking washer 10101 can be matched with the diameter of the inner threaded hole 101001, the inner tube The material of the locking gasket 10101 is not limited to silica gel, rubber, etc. The inner tube locking gasket 10101 also defines a first clamping hole 101010 through which the inner tube 2 can pass.

The specific working process of the inner tube locking mechanism 101 described in the first embodiment is as follows:

The locking nut 10100 is screwed into the outer thread 101020 of the locking seat 10102 in a positive direction, and the locking nut 10100 gradually squeezes the inner tube locking washer 10101 during the screwing process, so that the first clamp of the inner tube locking washer 10101 The diameter of the tightening hole 101010 is gradually reduced to hold the outer diameter of the inner tube 2 tightly, so as to realize the locking of the inner tube 2 . On the contrary, when the locking nut 10100 is reversely rotated, the inner tube locking washer 10101 is no longer squeezed and the diameter of the through hole in the inner tube locking washer 101101 is reset, thereby loosening the inner tube 2 and making the inner tube 2 The tube 2 is movable relative to the medical catheter 3 .

The specific structure of the inner tube locking mechanism 101 described in the second embodiment is as follows:

Please refer to FIG. 20 to FIG. 22 , including a clamping seat 10104 and a clamping portion, wherein a rotating disk 10105 and a fixed disk 10108 are arranged in the clamping seat 10104 , and the clamping portion is composed of multiple clamping sheets 10109. Adjustable clamping assembly, a second clamping hole 101093 is formed between each clamping piece 10109, the adjustable clamping assembly is rotated and driven by the rotating disk 10105 to open and close, so that the aperture of the second clamping hole 101093 is along the diameter to change.

Wherein, the rotating disk 10105 has a first connecting portion, the first connecting portion is a first sliding groove 101052 formed on the rotating disk 10105, and one side of each clamping piece 10109 is provided correspondingly connected to the first connecting portion The second connecting portion is specifically a first protrusion 101091 protruding along one side of the clamping piece 10109 .

When the rotating disk 10105 rotates, the first sliding groove 101052 drives the first protrusion 101091 on the clamping piece 10109 to move along the moving path of the first sliding groove 101052 .

Please continue to refer to FIG. 20 to FIG. 22 , the fixing plate 10108 has a third connecting portion, the third connecting portion is a second sliding groove 101081 opened on the fixing plate 10108 , and the other side of the clamping piece 10109 is provided with a second protrusion The protrusion 101092 is connected with the second sliding groove 101081, and moves along the second sliding groove 101081 when the second protrusion 101092 on the clamping piece 10109 rotates.

The above-mentioned multiple clamping pieces 10109 constituting the adjustable clamping assembly are evenly distributed along the circumferential direction, and the adjacent clamping pieces 10109 are partially tangent and form the same angle, so that during the radial opening and closing movement of the adjustable clamping assembly, each There is no gap between the sheet clamping sheets 10109.

A handle mounting port 101051 is also provided on the rotating disk 10105 for inserting the rotating handle 10107, a rotating disk through port 101053 is also opened on the axis of the fixed disk 10108, and a fixed disk through port 101082 is also opened on the axis of the rotating disk. The through hole 101053 and the fixed plate through hole 101082 are used for the inner pipe 2 to pass through. The clamping seat 10104 is sleeved on the outer side of the rotating disk 10105, and there is a first limit buckle 10103 extending in the radial direction on the clamping seat 10104. At least one anti-rotation buckle groove 10106 is defined on the outer side of the rotating disk 10105 and is used for It is clamped with the first limit buckle 10103 to limit the rotation of the rotating disk 10105 .

The specific structure of the inner tube locking mechanism 101 described in the third embodiment is as follows:

The inner tube locking mechanism 101 includes a second fixing part and a second rotating part hinged with the second fixing part, and the second fixing part and the other end of the second rotating part that are not connected through a tight Fixed device connection.

Please refer to FIG. 23 . Specifically, the second fixed part adopts a fixed end 10112 , and the second rotating part adopts a clamping end 10110 . A semicircular clamping port 10114, one end of the fixed end 10112 and one end of the clamping end 10110 are hinged through a hinge 10111, the other end of the fixed end 10112 and the other end of the clamping end 10110 are respectively provided with threaded holes . The above-mentioned tightening device is a threaded clamping handle 10113. By rotating the clamping handle 10113, the clamping end 10110 and the end of the fixed end 10112 with threaded holes are connected, so that the clamping end 10110 is relative to the The fixed end 10112 presses and holds the inner tube 2 tightly.

The specific structure of the inner tube locking mechanism 101 described in the fourth embodiment is as follows:

Please refer to FIG. 24, the first part, the first part is connected with the handle body 1, and a hole is opened on the first part.

The second part, the second part covers the moving end of the inner tube and can be abutted with the first part through a protruding structure or clamped through a tooth slot structure.

Specifically, please refer to FIG. 24 , the first part is specifically a tube sleeve 10116 , the tube sleeve 10116 is disposed on the handle body 1 , and a hole through which the inner tube 2 can be inserted is defined on the tube sleeve 10116 .

The second part is specifically a sleeve 10115 , and the sleeve 10115 covers the moving end of the inner tube 2 .

Specifically, the protruding structure refers to at least one protruding point disposed on the inner wall of the hole and at least another protruding point disposed outside the sleeve 10115, and the protruding points are soft structures. The holes on the sleeve 10116 are matched, so that the convex point on the inner wall of the hole abuts another convex point on the outside of the sleeve 10115, so that the friction force between the sleeve 10115 and the sleeve 10116 is increased to realize the fixation of the inner tube 2.

Specifically, the tooth slot structure refers to at least one second tooth 10118 disposed on the outer side of the sleeve 10115 and at least one groove disposed on the inner wall of the hole of the sleeve 10116 or can also be disposed on the inner wall of the hole of the sleeve 10116 At least one first tooth 10117 and at least one groove disposed on the outer side of the sleeve 10115, the tooth groove structure can also increase the friction between the sleeve 10115 and the sleeve 10116 to achieve the fixation of the inner tube 2.

The specific use process of the medical device is described below:

Step 1: Please refer to FIG. 25 , pass the head end of the inner tube 2 through the inner tube locking mechanism 101 and enter the inner tube channel 117 from the channel hole 143 , slowly push the inner tube 2 until it enters the medical catheter 3 and is removed from the medical catheter 3 The distal end of the inner tube protrudes by 4-5 cm (in this state, the inner tube curved section 202 of the inner tube 2 is fully extended).

Referring to the first embodiment of the inner tube locking mechanism 101, by rotating the locking nut 10100 on the locking seat 10102, the inner tube locking washer 10101 is squeezed, and the first clamping hole 101010 is further clamped in the radial direction the inner tube 2, so that the relative position of the inner tube 2 with respect to the medical catheter 3 is fixed. Turn on the camera assembly 2035 and the first light source 2036 on the inner tube 2 and the second and second light sources 3052 on the medical catheter 3 for illumination and photography. The tube head section 305 is about 20-30 cm, and the medical catheter 3 is inserted from the patient's mouth.

Step 2: Please refer to Figure 26 and Figure 27. During the process of pushing the medical catheter 3 with the right hand, continuously use the fingers of the left hand to turn the upper wheel 127 and the lower wheel 119 to control the curvature of the inner tube 2. The specific process is as follows:

Please refer to FIGS. 13 to 15 , take one set of control components as an example, turn the upper roulette knob 107 , the upper roulette knob 107 drives the upper roulette 127 to rotate, and then controls the upper roulette spring plate 128 to slide on the upper roulette spring plate Moving in the groove 130, the movement of the upper disc spring 128 further drives the upper disc pull wire 131 to move. The inner tube bending section 202 is connected, so that when the upper roulette pull wire 131 moves, the inner tube bending section 202 can be driven to control the bending of the inner tube bending section 202, and the images fed back by the camera assembly 2035 pass through the esophagus and enter the stomach, using the first A light source 2036 and a second light source 3052 illuminate the stomach space and then pass through the pylorus and into the duodenum.

Step 3: Please refer to Figure 11 and Figure 28, use a syringe to inject gas or liquid into the passage 3021 of the medical catheter 3 through the pipeline from the balloon valve 111 at the end of the handle, and the gas or liquid passes through the passage 3021 and enters the support part In the storage cavity 3032 of 303, the support portion 303 is expanded, and after the support portion 303 is expanded, the space inside the duodenum is supported. In other embodiments of the present invention, the water injection and gas injection pipe 137 can also be used to communicate with the passage 3021 through a pipeline, so as to transport gas or liquid into the storage cavity 3032 of the support portion 303 through the passage 3021 .

Step 4: Please refer to 29. The left-hand operation handle is used to control the bending of the medical catheter. The specific process of bending the medical catheter is as follows:

The specific working process of the outer control bending mechanism is as follows:

Please refer to FIGS. 11 and 12 , the user operates the clamp lifter handle 105 , the clamp lifter handle 105 drives the clamp lifter turntable 106 to rotate, and the clamp lifter turntable 106 is given a rotating pair and passes through the clamp lifter pull rod 113 The rotating pair is transformed into a moving pair in which the caliper lifter slider 115 reciprocates in the latching sliding groove 1161 of the caliper lifter slide plate 116 , and the caliper lifter slider 115 pulls the wire through the outer tube during the movement. 301 drives the proximal end of the medical catheter 3 to bend, so that the proximal end of the medical catheter 3 provides a baffle effect when it is bent, thereby changing the advancing direction of the inner tube 2 matched with the medical catheter 3, and entering the lens to ten During the process of the duodenum, the original direct view direction is changed to the side view direction, so that the inner tube 2 can be aligned with the papilla located on the side wall of the descending part of the duodenum and continue to enter the direction of the common bile duct. The inner tube 2 is withdrawn into alignment with the outer tube head section 305 of the medical catheter 3 by means of the control member. The relative positions of the inner tube 2 and the medical catheter 3 are again fixed by the inner tube locking mechanism 101 .

When the bending of the outer tube bending section 304 of the medical conduit 3 is lifted by 90°, since the inner tube 2 is located in the medical conduit 3, the inner tube 2 is also bent by about 90° along with the medical conduit 3. Please refer to FIG. 29 . The viewing direction of the inner tube head section 203 of the inner tube 2 is changed from the same direction as that of the medical catheter 3 to being perpendicular to the medical catheter 3 , forming a side-view observation effect. The user's right hand continues to slowly insert the medical catheter 3 until the nipple structure on the side wall of the twelve straight long descending parts is found.

Please refer to FIG. 31 , loosen the inner tube locking mechanism 101 , so that the inner tube 1 can continue to penetrate and the bending angle of the inner tube bending section 202 of the inner tube 2 can be controlled by the inner tube bending mechanism, so that the nipple appears in the inner tube 2 In view of the pipe head section 203 . The guide wire is inserted from the instrument channel of the handle and sequentially passes through the first lumen 2041 on the inner tube main body section 201 of the inner tube 2 and protrudes from the fourth hole 2033 through the inner tube curved section 202, and is returned by the camera assembly 2035. The guide wire is seen on the image as it enters the bile or pancreatic duct.

If the nipple opening is small, a cutting knife or a nipple expansion balloon can be inserted along the guide wire to dilate the nipple opening. By advancing the inner tube head section 203 of the inner tube 2, the stones or suspicious tumor protrusions are searched in depth step by step.

Step 5: After finding the stone, pull out the guide wire and insert the optical fiber or electrode along the first passage of the inner tube 2, specifically, the optical fiber or the electrode is passed through the inner tube sequentially from the first cavity 2041 in the first tube 204 of the inner tube 2 Bend the segment 202 and protrude from the fourth hole 2033 for laser lithotripsy or hydroelectric lithotripsy.

Please continue to refer to FIG. 32 , when a suspicious tumor protrusion is found, the guide wire can be pulled out, and the biopsy forceps can be inserted. The hole 2033 is extended for tissue biopsy.

After operation, the gas or liquid in the storage cavity 3032 in the support portion 303 is drawn out through the suction port 138 with a syringe, and then the inner tube 2 and the medical catheter 3 are pulled out of the human body together.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are more specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

The medical catheter includes an outer tube main body section, an outer tube curved section and an outer tube head section, the proximal end of the outer tube head section is connected with the distal end of the outer tube curved section, and the proximal section of the outer tube curved section is connected to The distal end of the outer tube main body section is connected, and the proximal end of the outer tube main body section is connected with the handle, and it is characterized in that: it also includes a supporting part, and the supporting part is at least one and is arranged on the outer tube main body section. the distal end; the outer tube body section further has a passage, the distal end of the passage is connected with the support part, and the proximal end of the passage is connected with the handle.
The medical catheter according to claim 1, wherein the first center of the supporting portion is not concentric with the second center of the main body section of the outer tube, and the non-concentricity causes the supporting portion to have the same diameter as the outer tube. One or more connection ends of the passage connection on the pipe body section.
The medical catheter according to claim 2, wherein an opening is provided on the outer tube head section, and the opening is arranged along the axial direction of the outer tube head section.
The medical device is characterized in that it comprises the medical catheter according to any one of claims 1 to 3, an inner tube and a handle which are used together with the medical catheter, and the proximal end of the medical catheter is connected to the handle, The proximal end of the inner tube is also connected to the handle, and the distal end of the inner tube enters the handle from the passage of the handle and penetrates the medical catheter to extend from the distal end of the medical catheter.
The medical device according to claim 4, wherein the handle comprises a handle body, the handle body has a passage hole and an inner tube connecting piece, the handle body is used for installing a medical catheter, and the distal end of the inner tube is connected to the inner tube. The inner tube connector is connected, and the proximal end of the inner tube enters the handle body through the passage hole and is used in cooperation with the medical catheter;

an outer tube bending mechanism, the outer tube bending mechanism is arranged inside the handle body, and the outer tube bending mechanism is used to control the curvature of the medical catheter;

An inner tube bending mechanism is also provided inside the handle body, and the inner tube bending mechanism is used to control the curvature of the inner tube.
The medical device according to claim 5, wherein the outer tube bending control mechanism comprises: a first rotating part; a first movable part, the first movable part is connected with the first rotating part, and the rotating part The part is given a rotating pair and realizes the movement between the first position and the second position through the movable part;

An outer tube pull wire, the distal end of the outer tube pull wire is connected with the movable part, and the proximal end of the outer tube pull wire extends into the medical conduit and is connected with the proximal end of the medical conduit.
The medical device of claim 5, wherein the inner tube control bending mechanism comprises at least one set of control components, the control components comprising:

A second rotating part, the second rotating part is rotatably arranged in the handle body.

a first elastic part, the first elastic part is connected with the second rotating part, the rotating part is endowed with a rotating pair and realizes the movement between the third position and the fourth position through the first elastic part;

At least one inner tube pull wire, the proximal end of the inner tube pull wire is connected with the elastic member, and the distal end of the inner tube pull wire extends into the inner tube and is connected with the proximal end of the inner tube.
The medical device according to claim 6, wherein the handle further comprises an outer control curve self-locking mechanism, and the outer control curve self-locking mechanism comprises:

a pressing part, the pressing part is arranged in the handle body;

A third rotating part, the third rotating part is rotatably disposed in the handle body, and when the pressing part is pressed, the third rotating part can rotate relative to the handle body and be connected with the first handle body. The rotating part is snapped.
The medical device according to claim 7, wherein the inner tube control and bending mechanism further comprises a wheel baffle plate, the wheel plate baffle plate is arranged in the handle body, and the control part is located in the wheel plate One and/or both sides of the baffle.
The medical device according to claim 9, wherein the inner tube control and bending mechanism further comprises at least two spring leaf positioning plates, and adjacent spring leaf positioning plates are spaced apart and fixed on the roulette baffle. On one side and/or both sides, a spring-plate sliding groove for reducing the friction force of the first elastic member is formed between the adjacent spring-plate positioning plates.
The medical device according to claim 10, wherein the handle further comprises an inner control curve self-locking mechanism disposed inside the handle body, the inner control curve self-locking mechanism comprising:

a fourth rotating part, the fourth rotating part is rotatably arranged in the handle body;

axle seat;

A pair of locking pieces, the pair of locking pieces are rotatably arranged on the axle seat, and the proximal end of each locking piece is connected with the fourth rotating part, after the fourth rotating part is given a rotating pair The distal ends of the pair of locking pieces are driven to be closed relative to each other so as to hold the second rotating part.
The medical device according to claim 11, wherein a second elastic member is provided between the distal ends of the pair of locking pieces, and the second elastic piece makes the distal ends of the pair of locking pieces It can be relatively opened to release the second rotating part.
The medical device according to claim 7, wherein the handle further comprises an inner control curved self-locking mechanism disposed outside the handle body, the inner control curved self-locking mechanism comprising:

a fixed shaft, the fixed shaft is connected with the second rotating part;

a fifth rotating part, the fifth rotating part is rotatably arranged on the fixed shaft;

a spacer, the spacer is in clearance fit with the second rotating part and is placed inside the fifth rotating part; when the fifth rotating part is applied with a rotating pair, the spacer is rotated by the fifth rotating part The part presses and presses the second rotating part in the radial direction.
The medical device of claim 7, further comprising an inner tube locking mechanism disposed outside the handle body, the inner tube locking mechanism restricting the movement of the inner tube relative to the medical catheter.
The medical device of claim 14, wherein the inner tube locking mechanism comprises:

a first fixed part and a first rotating part connected with the first fixed part;

A clamping part having a clamping hole through which the inner tube passes and provided between the first fixed part and the first rotating part, when the first rotating part is given a rotating pair The clamping part can be rotated and driven relative to the first fixing part, so that the diameter of the clamping hole can be changed in the radial direction.
The medical device of claim 15, wherein the clamping portion is a single and elastic tubular structure, and the clamping hole is disposed through the tubular structure.
The medical device according to claim 15, wherein the clamping part is an adjustable clamping assembly composed of a plurality of clamping sheets, and the adjustable clamping assembly drives the whole through the first rotating part Do opening and closing movements.
The medical device according to claim 17, wherein the first rotating part has a first connecting part, and one side of each clamping piece is provided with a second connecting part corresponding to the first connecting part , when the first rotating part rotates, the first connecting part drives the second connecting part to move along the moving path of the first connecting part.
The medical device according to claim 17, wherein the first fixing part has a third connecting part, and the other side of each clamping piece is provided with a fourth connecting part, when the third connecting part rotates , the third connecting part moves along the moving path of the fourth connecting part.
The medical device of claim 18, wherein the first connecting portion is a first sliding groove disposed on the first fixing portion, and the second connecting portion extends along one side of the clamping piece the first bulge.
The medical device according to claim 19, wherein the third connecting portion is a second protrusion disposed on the clamping piece, and the fourth connecting portion is disposed on the first rotating portion and is connected to the first rotating portion. The two protrusions correspond to the second sliding grooves.
The medical device according to claim 17, wherein the plurality of clamping pieces constituting the adjustable clamping assembly are evenly distributed along the circumferential direction, and the adjacent clamping pieces are partially tangent and form the same angle, so that the During the radial opening and closing movement of the adjustable clamping assembly, there is no gap between each clamping piece.
The medical device of claim 14, wherein the inner tube locking mechanism comprises:

The second fixed part and the second rotating part hinged with the second fixed part are connected by a fastening device.
The medical device of claim 14, wherein the inner tube locking mechanism comprises:

a first part, the first part is connected with the handle body, and a hole is opened on the first part;

The second part, the second part covers the moving end of the inner tube and can be clamped with the first part.