Medical catheter and medical device containing the catheter

Abstract

The present invention relates to a medical catheter and a medical device comprising the catheter. The medical catheter comprises an outer tube main section, an outer tube curved section, and an outer tube head section. The medical catheter also comprises a support portion and a passageway. A medium is injected into the support portion through the passageway into a storage cavity, causing the support portion to expand, or the medium is extracted from the storage cavity through the passageway, causing the support portion to contract. The medical device comprises the above-mentioned medical catheter, and an inner tube and a handle for use with the medical catheter. The distal end of the inner tube enters the handle through the passageway of the handle, penetrates the medical catheter, and extends from the distal end of the medical catheter. The present invention enhances the stability of the medical device by providing a support portion. The passageway is used to fill the storage cavity inside the support portion with a medium, causing the support portion to expand and drive the entire section of the medical catheter to move and adhere to the intestinal wall. The support portion is used to expand the intestinal space, thereby increasing the distance from the inner tube to the nipple, providing space and stability for the operation of the inner tube.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a medical catheter and a medical device comprising the catheter. Background Art

[0002]

Introduction to oral choledochoscopy

[0003] Cholangioscopy and cholangioscopic techniques are widely used clinically and have become one of the most important diagnostic tools and treatments for intrahepatic and extrahepatic biliary tract diseases and special conditions. They have also become one of the most important minimally invasive techniques in biliary surgery and liver surgery. Cholangioscopy is generally divided into two categories based on the endoscopic approach: artificial and natural endoscopic approaches. Artificial approaches can include T-tube sinus, percutaneous transhepatic, and intraoperative cholangioscopy, while natural endoscopic approaches primarily involve transoral cholangioscopy.

[0004]

Introduction to choledochoscope

[0005] The most classic transoral choledochoscopy technique involves first performing a duodenoscope (a mother scope) for duodenal papillomatomy. Then, a daughter scope (a transoral choledochoscope with a diameter of approximately 3.5 mm) is inserted through the mother scope's instrument channel into the common bile duct. This allows for extrahepatic bile duct examination, biopsy, and stone removal. This technique offers the advantages of natural endoscopic insertion, eliminating the need for surgical intervention and minimizing trauma.

[0006] The method of using the above-mentioned choledochoscope is as follows:

[0007] The mother endoscope (duodenoscope) is inserted through the mouth;

[0008] The mother mirror body passes through the stomach through the pylorus to the duodenum;

[0009] The papilla is found in the descending part of the duodenum and is cut open with a cutting knife or the papilla opening is dilated with a dilating balloon.

[0010] Insert the daughter endoscope (oral choledochoscope with a diameter of approximately 3.5 mm) from the instrument channel entrance of the mother endoscope;

[0011] The sub-lens end extends from the instrument channel outlet of the mother endoscope, is inserted into the duodenal papilla, and enters the bile duct or pancreatic duct;

[0012] After the sub-scope finds the tumor or stone, a biopsy forceps or laser fiber is inserted through the instrument channel of the sub-scope for biopsy or laser lithotripsy.

[0013] [Technical problems existing in existing technologies]

[0014] The aforementioned biliary endoscope allows for direct visualization of the bile and pancreatic ducts and is an important minimally invasive procedure that follows the natural pathway, benefiting numerous patients. However, because it requires the coordination of two sets of endoscopes (the daughter endoscope and the mother endoscope), its combined technical principles present significant operational difficulties. Specific issues are as follows:

[0015] (1) Insufficient stability: The distal end of the mother endoscope is suspended near the papilla. Since the common bile duct axis and the descending duodenum intersect at an acute angle, the daughter endoscope must be reversed in a J shape when it reaches the descending duodenum before it can be aligned with the duodenal papilla. The distal end of the mother endoscope has no support and is easily moved by intestinal peristalsis, causing the head end of the daughter endoscope body inside the mother endoscope instrument channel to shift. In addition, the daughter endoscope cannot continue to move toward the common bile duct due to lack of support, thus affecting the surgical operation.

[0016] (2) Insufficient lighting. The space for arranging the light source at the end of the sub-scope is limited. The light source close to the sub-scope cannot illuminate the larger space of the stomach, making it difficult to use the sub-scope independently to enter the stomach and find the pylorus.

[0017] (3) High difficulty in operation: The handles for operating the sub-mirror and the handles for operating the main mirror require close cooperation between two senior doctors to adjust the distance between the two sets of handles. Therefore, the operation is extremely difficult and complicated.

[0018] (4) Cross-infection between patients is a risk: To change the direction of movement of the daughter mirror relative to the mother mirror, existing mother mirrors are equipped with a lifting device at the head end, which acts as a baffle. However, this lifting device is complex and difficult to sterilize. Disposable mother mirrors have also been designed to address this issue, but these are relatively expensive. Summary of the Invention

[0019] 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 comprising the catheter to solve one or more problems in the prior art.

[0020] To achieve the above object, the technical solution of the present invention is as follows:

[0021] A medical catheter comprises an outer tube main section, an outer tube curved section and an outer tube head section, wherein the proximal end of the outer tube head section is connected to the distal end of the outer tube curved section, the proximal section of the outer tube curved section is connected to the distal end of the outer tube main section, and the proximal end of the outer tube main section is connected to a handle. The catheter also comprises a support portion, wherein there is at least one support portion and the support portion is arranged at the distal end of the outer tube main section. The outer tube main section also has a passage, wherein the distal end of the passage is connected to the support portion, and the proximal end of the passage is connected to the handle.

[0022] Furthermore, the first center of the support portion is not concentric with the second center of the outer tube main body segment, and the non-concentricity enables the support portion to have one or more connection ends connected to the passage on the outer tube main body segment.

[0023] Furthermore, 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.

[0024] A medical device includes the above-mentioned medical catheter, and an inner tube and a handle used in conjunction with the medical catheter. 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 through the channel of the handle, penetrates the medical catheter, and extends out from the distal end of the medical catheter.

[0025] Furthermore, the handle includes a handle body having a passage hole and an inner tube connector. The handle body is used to install a medical catheter, the distal end of the inner tube is connected to the inner tube connector, and the proximal end of the inner tube enters the handle body through the passage hole and is used in conjunction with the medical catheter.

[0026] Furthermore, an external bending control mechanism is provided inside the handle body, and is used to control the curvature of the medical catheter;

[0027] Furthermore, an internal bending control mechanism is also provided inside the handle body, and is used to control the curvature of the inner tube.

[0028] Furthermore, the external control bending mechanism includes: a first rotating part; a first movable part, the first movable part is connected to the first rotating part, the rotating part is given a rotating pair and moves between the first position and the second position through the movable part;

[0029] An outer tube pull wire, the distal end of which is connected to the movable part, and the proximal end of which extends into the medical catheter and is connected to the proximal end of the medical catheter.

[0030] Furthermore, the inner control bending mechanism includes at least one set of control components, and the control components include:

[0031] The second rotating part is rotatably disposed in the handle body.

[0032] The first elastic member is connected to the second rotating part, the rotating part is provided with a rotating pair and moves between a third position and a fourth position through the first elastic member;

[0033] At least one inner tube pull wire, the proximal end of the inner tube pull wire is connected to the elastic member, and the distal end of the inner tube pull wire extends into the inner tube and is connected to the proximal end of the inner tube.

[0034] Furthermore, the handle further includes an external control bending self-locking mechanism, and the external control bending self-locking mechanism includes:

[0035] A pressing portion, the pressing portion being provided in the handle body;

[0036] A third rotating portion is rotatably disposed in the handle body. When the pressing portion is pressed, the third rotating portion can be rotated relative to the handle body and engaged with the first rotating portion.

[0037] Furthermore, the inner control bending mechanism also includes a wheel baffle, which is arranged in the handle body, and the control component is located on one side and / or both sides of the wheel baffle.

[0038] Furthermore, the internal control bending mechanism also includes at least two spring leaf positioning plates, adjacent spring leaf positioning plates are spaced apart and are fixed to one side and / or both sides of the wheel disc baffle, and a spring leaf sliding groove is formed between the adjacent spring leaf positioning plates to reduce the friction of the first elastic member.

[0039] Furthermore, the handle further comprises an inner control bending self-locking mechanism provided inside the handle body, and the outer control bending self-locking mechanism comprises:

[0040] a fourth rotating portion, the fourth rotating portion being rotatably disposed in the handle body;

[0041] Axle seat;

[0042] A pair of locking plates are rotatably arranged on the shaft seat, and the proximal end of each locking plate is connected to the fourth rotating part. After the fourth rotating part is given a rotating pair, the distal ends of the pair of locking plates can be relatively closed to hold the second rotating part.

[0043] Furthermore, a second elastic member is provided between the distal ends of the pair of locking pieces, and the second elastic member enables the distal ends of the pair of locking pieces to open relative to each other to release the second rotating part.

[0044] Furthermore, the handle further comprises an internal control bending self-locking mechanism provided on the outside of the handle body, and the internal control bending self-locking mechanism comprises:

[0045] a fixed shaft connected to the second rotating part;

[0046] a fifth rotating portion, the fifth rotating portion being rotatably disposed on the fixed shaft;

[0047] The gasket is in clearance fit with the second rotating part and is disposed on the fifth rotating part.

[0048] Inside, when the fifth rotating part is subjected to the rotation pair, the gasket is pressed by the fifth rotating part and presses the second rotating part in the radial direction.

[0049] Furthermore, it also includes an inner tube locking mechanism arranged outside the handle body, and the inner tube locking mechanism limits the movement of the inner tube relative to the medical catheter.

[0050] The inner tube locking mechanism comprises:

[0051] a first fixing portion and a first rotating portion connected to the first fixing portion;

[0052] The clamping part has a clamping hole for the inner tube to pass through and is arranged between the first fixed part and the first rotating part. When the first rotating part is given a rotating pair, it can rotate relative to the first fixed part and drive the clamping part to achieve radial change of the aperture of the clamping hole.

[0053] Furthermore, the clamping portion is a single elastic tubular structure, and the clamping hole is provided through the tubular structure.

[0054] Furthermore, the clamping portion is an adjustable clamping assembly composed of multiple clamping pieces, and the adjustable clamping assembly is driven by the first rotating portion to perform an opening and closing movement as a whole.

[0055] Furthermore, the first rotating part has a first connecting part, and a second connecting part corresponding to the first connecting part is provided on one side of each clamping piece. 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.

[0056] Furthermore, the first fixing portion has a third connecting portion, and a fourth connecting portion is provided on the other side of each clamping piece. When the third connecting portion rotates, the third connecting portion moves along the moving path of the fourth connecting portion.

[0057] Furthermore, 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.

[0058] Furthermore, the third connecting portion is a second protrusion provided on the clamping piece, and the fourth connecting portion is a second sliding groove provided on the first rotating portion and corresponding to the second protrusion.

[0059] Furthermore, the multiple clamping plates constituting the adjustable clamping assembly are evenly distributed along the circumferential direction, and adjacent clamping plates are partially tangent and form the same angle, so that there is no gap between each clamping plate during the radial opening and closing movement of the adjustable clamping assembly.

[0060] Furthermore, the inner tube locking mechanism includes:

[0061] A second fixing portion and a second rotating portion hinged to the second fixing portion, wherein the second fixing portion and the other unconnected end of the second rotating portion are connected via a fastening device.

[0062] Furthermore, the inner tube locking mechanism includes:

[0063] a first portion, the first portion being connected to the handle body and having a hole formed therein;

[0064] The second part covers the movable end of the inner tube and can be engaged with the first part.

[0065] Compared with the prior art, the beneficial technical effects of the present invention are as follows

[0066] Stability is enhanced by arranging a support portion at the distal end of the outer tube main body, and using a passage to fill the storage cavity inside the support portion with a medium, so that the support portion expands and drives the entire medical catheter to move and adhere to the intestinal wall. The support portion is used to expand the intestinal space so that the distance from the inner tube to the nipple is increased, providing space and stability for the operation of the inner tube.

[0067] Furthermore, a light source is provided at the head section of the outer tube, and the medical catheter light source is used in conjunction with the inner tube light source to illuminate the large stomach space, thereby overcoming the problem of insufficient light in the stomach space without increasing the outer diameter of the inner tube.

[0068] Furthermore, 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 increased by 1 times, so that a biopsy forceps with an outer diameter of 1.5 mm can be used in the first passage, thereby increasing the bite force of the biopsy forceps and achieving a significant increase in the sampling volume, reducing the number of sampling times, and expanding the scope of use of the instrument.

[0069] Furthermore, the second passages for installing the circuit and the medium each have an independent cavity, so that the flow rate of the medium is larger and the passages are not affected by each other.

[0070] Furthermore, the difficulty of operation is reduced, and the handle is reduced from the original two handles to only one handle, so the user can operate it alone. By adding an external control bending mechanism in the handle body, the forceps lifter handle is used to drive the forceps lifter turntable, and the forceps lifter turntable is given a rotating pair and the rotating pair is converted into a moving pair through the forceps lifter pull rod, and the forceps lifter slider moves back and forth in the sliding groove of the forceps lifter slide. During the movement, the forceps lifter slider drives the proximal end of the medical catheter to bend through the external tube pull wire, so that the proximal end of the medical catheter provides a baffle effect when bending, thereby changing the forward direction of the inner tube cooperating with the medical catheter, and changing the original straight viewing direction to the side viewing direction during the process of inserting the endoscope into the duodenum, so that the inner tube can be aligned with the nipple on the side wall of the descending part of the duodenum and continue to enter in the direction of the common bile duct.

[0071] Furthermore, an internal control bending mechanism is provided inside the handle, and the internal control bending mechanism has two sets of control components, and each set of control components controls two pull wires respectively, so that the inner tube bending section of the inner tube can be bent in two directions, and then the two sets of control components 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.

[0072] Furthermore, to prevent friction between the lower wheel disc spring and the housing or other components, the inner control bending mechanism is further provided with lower wheel disc spring positioning plates. Lower wheel disc spring sliding grooves are formed between the positioning plates, allowing the spring to slide along the sliding grooves. A wheel disc baffle is also provided to cover the upper wheel disc spring positioning plates, preventing unnecessary friction caused by contact between the upper wheel disc cable and other components.

[0073] Furthermore, an external control bending locking mechanism is provided in the handle. The external control bending self-locking mechanism utilizes the downward movement of the spring pin when pressed, so that the pin head of the spring pin applies pressure to the limit rod, so that the limit rod rotates along the limit buckle and contacts the forceps lifter turntable, thereby limiting the rotation of the forceps lifter turntable to achieve self-locking of the medical catheter at any curvature.

[0074] Furthermore, an internal control bend locking mechanism is provided within the handle. This self-locking mechanism can lock the inner tube relative to the medical catheter in any of the following directions: up, down, left, or right. The internal control bend locking mechanism has two configurations, one located outside or inside the handle body. One configuration utilizes a rotating portion to cause the locking pieces of the pressure rod portion to rotate relative to each other about an axis, thereby causing the distal ends of adjacent locking pieces to close relative to each other and respectively grip the upper and lower discs, thereby achieving self-locking of the inner tube in any direction. The other configuration utilizes a rotating locking knob to rotate a rotational stop block. Rotation of the rotational stop block along a surface applies axial pressure to the fixed stop block, enabling axial movement. A first locking washer is provided on the back of the fixed stop block. This first locking washer is squeezed and applies axial pressure to the lower disc, causing the lower disc knob to move under this pressure. During this movement, the inner diameter of the first locking washer gradually decreases, gripping the shaft end of the lower disc, preventing it from rotating. At the same time, after the lower wheel disc knob is squeezed, it moves axially at the shaft end of the lower wheel disc and contacts the upper wheel disc knob, causing the inner diameter of the second locking washer at the upper wheel disc knob to shrink radially and hold the shaft end of the upper wheel disc, thereby locking the upper wheel disc, thereby achieving locking of the upper and lower wheel discs.

[0075] Furthermore, an inner tube locking mechanism is also provided in the handle. The inner tube locking mechanism adopts a clamping part that rotates through the first rotating part and uses the clamping part to apply pressure to the inner tube. The inner tube can also be locked by a rotary structure or a sleeve structure, so that the position of the inner tube relative to the medical catheter is fixed to achieve the clamping and loosening of the inner tube.

[0076] Furthermore, 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 imaging system and one endoscopic image processor are required. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1 A schematic structural diagram of a medical catheter in an embodiment of the present invention and a medical device including the catheter is shown.

[0078] Figure 2 A front view showing the structure of the outer tube head section of a medical catheter and a medical device containing the catheter according to an embodiment of the present invention

[0079] Figure 3 A schematic structural diagram of a medical catheter and a supporting portion provided in a medical device including the catheter according to an embodiment of the present invention is shown.

[0080] Figure 4 A cross-sectional schematic diagram showing the connection between the outer tube main body section and the support portion in a medical catheter and a medical device including the catheter according to an embodiment of the present invention is shown.

[0081] Figure 5 A schematic structural diagram of a medical device including a medical catheter according to an embodiment of the present invention is shown.

[0082] Figure 6 A front view of a medical catheter and an inner tube of a medical device including the catheter according to an embodiment of the present invention is shown.

[0083] Figure 7 A schematic structural diagram of an inner tube head section of a medical catheter and a medical device including the catheter according to an embodiment of the present invention is shown.

[0084] Figure 8 A partial structural schematic diagram of an inner tube head section of a medical catheter and a medical device including the catheter according to an embodiment of the present invention is shown.

[0085] Figure 9 A cross-sectional view of an inner tube main body section of a medical catheter and a medical device including the catheter according to an embodiment of the present invention is shown.

[0086] Figure 10 A cross-sectional view of a main section of an inner tube of a medical catheter and a medical device comprising the catheter according to another embodiment of the present invention is shown.

[0087] Figure 11 A schematic structural diagram of the exterior of a handle in a medical catheter and a medical device including the catheter according to an embodiment of the present invention is shown.

[0088] Figure 12 A schematic structural diagram of an external control bend mechanism in a medical catheter and a medical device including the catheter according to an embodiment of the present invention is shown.

[0089] Figure 13 The diagram shows the partial structure of the internal control bending mechanism in the medical catheter and the medical device containing the catheter according to the embodiment of the present invention. Figure I .

[0090] Figure 14 The diagram shows the partial structure of the internal control bending mechanism in the medical catheter and the medical device containing the catheter according to the embodiment of the present invention. Figure II .

[0091] Figure 15 The diagram shows the partial structure of the internal control bending mechanism in the medical catheter and the medical device containing the catheter according to the embodiment of the present invention. Figure III .

[0092] Figure 16 The structure diagram of the internal control bending mechanism in the medical catheter and the medical device containing the catheter in the first embodiment of the present invention is shown. Figure I .

[0093] Figure 17The structure diagram of the internal control bending mechanism in the medical catheter and the medical device containing the catheter in the first embodiment of the present invention is shown. Figure II .

[0094] Figure 18 A schematic structural diagram of a second embodiment of a medical catheter and an internal control bend mechanism in a medical device including the catheter according to an embodiment of the present invention is shown.

[0095] Figure 19 A schematic structural diagram of a first embodiment of an inner tube locking mechanism in a medical catheter and a medical device including the catheter according to an embodiment of the present invention is shown.

[0096] Figure 20 The structure diagram of the inner tube locking mechanism of the medical catheter and the medical device containing the catheter in the second embodiment of the present invention is shown. Figure I .

[0097] Figure 21 The structure diagram of the inner tube locking mechanism of the medical catheter and the medical device containing the catheter in the second embodiment of the present invention is shown. Figure II .

[0098] Figure 22 The schematic diagram of the structure of the inner tube locking mechanism of the medical catheter and the medical device containing the catheter in the second embodiment of the present invention is shown. Figure III .

[0099] Figure 23 A schematic structural diagram of a third embodiment of the inner tube locking mechanism of a medical catheter and a medical device including the catheter according to an embodiment of the present invention is shown.

[0100] Figure 24 A schematic diagram showing the structure of the fourth embodiment of the medical catheter and the inner tube locking mechanism in the medical device containing the catheter according to the present invention

[0101] Figure 25 A schematic diagram showing the insertion of a medical catheter into the body through the mouth in the medical device according to an embodiment of the present invention is shown.

[0102] Figure 26 A schematic diagram showing a medical catheter in the medical device according to an embodiment of the present invention searching for the pylorus in the stomach is shown.

[0103] Figure 27 A schematic diagram showing a medical catheter passing through the pylorus in the stomach in a medical device according to an embodiment of the present invention is shown.

[0104] Figure 28 A schematic diagram showing a medical catheter entering the duodenum in a medical device according to an embodiment of the present invention is shown.

[0105] Figure 29A schematic diagram showing the supporting portion of the medical device according to an embodiment of the present invention expanding the internal space of the intestine is shown.

[0106] Figure 30 A schematic diagram showing the bending of the outer tube curved section in the medical device according to an embodiment of the present invention to find the nipple and insert a guide wire is shown.

[0107] Figure 31 A schematic diagram showing the insertion of the inner tube tip end into the nipple in the medical device according to an embodiment of the present invention is shown.

[0108] Figure 32 A schematic diagram showing the biopsy forceps in the medical device according to an embodiment of the present invention extending through the instrument channel of the inner tube is shown.

[0109] In the accompanying drawings, reference numerals are as follows: 1. handle body;

[0110] 101. Inner tube locking mechanism; 10100. Locking nut; 101001. Internally threaded hole; 10101. Inner tube locking washer; 101010. First clamping hole; 10102. Locking seat; 101020. External thread; 10103. First position-limiting buckle; 10104. Clamping seat; 10105. Rotating disk; 101051. Handle mounting opening; 101052. First sliding slot; 101053. Rotating disk through-opening; 10106. Anti-rotation buckle slot; 10107. Rotating handle; 10108. Fixed disk; 101081. Second sliding groove; 101082. Fixed disk 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. Pipe sleeve; 10117. First tooth; 10118. Second tooth.

[0111] 102. External control bending self-locking mechanism; 10201. Spring pin; 10202. Limit rod; 102021. Clamping tooth; 10203. Second limit buckle;

[0112] 103. Left housing; 104. Right housing; 105. Lifter handle; 106. Lifter turntable; 1061. Tooth groove; 107. Upper wheel knob; 108. Lower wheel knob; 109. Locking knob; 110. Tee; 111. Ball valve; 112. Lifter rod buckle; 113. Lifter rod; 114. Slider buckle; 115. Lifter slider; 116. Lifter slide; 1161. Buckle sliding groove; 1162. Pull wire hole; 117. Inner tube passage; 118. Lower wheel rib; 119. Lower wheel; 1191. Fixed shaft mounting hole; 120. Fixed shaft; 121. Lower wheel spring; 122. Lower wheel spring positioning plate; 123. Lower wheel spring sliding groove; 124. Lower wheel cable; 125. Lower wheel cable buckle; 126. Upper wheel rib; 127. Upper wheel; 128. Upper wheel spring; 129. Upper wheel spring positioning plate; 130. Upper wheel spring sliding groove; 131. Upper wheel cable; 132. Upper wheel cable buckle; 133. Wheel baffle; 134. Inner tube connector; 135. Outer tube transition connector; 136. Cable cover; 137. Water and air injection pipe; 138. Suction port; 139. Locknut; 140. Rotation limit block; 1401. Protrusion; 141. Fixed limit block; 1411. First surface; 1421. First locking washer; 1422. Second locking washer; 143. Passage hole; 144. Pressure rod; 145. Locking handle; 146. Shaft seat; 1461. Shaft; 147. Locking plate; 148. Spring;

[0113] 2. Inner tube; 201. Inner tube main section; 2011. First hole; 2012. Second hole; 2013. First opening; 2014. Second opening; 2015. Second surface; 202. Inner tube bend; 203. Inner tube head section; 2031. Third hole; 2032. First mounting port; 2033. Fourth hole; 2034. Second mounting port; 2035. Camera assembly; 2036. First light source; 204. 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. Fifth hole;

[0114] 3. Medical catheter; 301. Outer tube pull wire; 302. Outer tube main section; 3021. Passage; 3022. Tube cavity; 3023. Second center; 303. Support portion; 3031. First center; 3032. Storage cavity; 304. Outer tube bending section; 305. Outer tube head section; 3051. Second pull wire hole; 3052. Second light source; 3053. Inner tube mounting hole; 3054. Opening; 306. Third pull wire hole. DETAILED DESCRIPTION

[0115] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the following detailed description of the medical catheter and medical device comprising the catheter proposed by the present invention is provided in conjunction with 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 drawings are in a very simplified form and are not in exact proportions. They are only used to conveniently and clearly illustrate the objectives of the embodiments of the present invention. To make the objectives, features, and advantages of the present invention more clearly understood, please refer to the drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in this specification for the understanding and reading of those familiar with the art. They are not intended to limit the implementation conditions of the present invention and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size, without affecting the efficacy and objectives of the present invention, should still fall within the scope of the technical content disclosed by the present invention.

[0116] In order to more clearly describe the structure of the medical catheter and the medical device containing the catheter, the present invention defines the terms "distal end" and "proximal end". The above terms are specialized terms in the field of medical devices. Specifically, the "distal end" refers to the end that enters the human body away from the operator during surgery, and the "proximal end" refers to the end that is close to the operator during surgery. Figure 5 For example, Figure 5 The left side is the proximal end, Figure 5 The right side is the distal end.

[0117] The specific structure of the medical catheter 3 is described below:

[0118] Please refer to Figures 1 to 5 The medical catheter 3 includes an outer tube main section 302, an outer tube curved section 304 and an outer tube head section 305. 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 to the distal end of the outer tube main section 302. The proximal end of the outer tube main section 302 is connected to the handle.

[0119] There is at least one support portion 303 disposed at the distal end of the outer tube main section 302 , and a storage cavity 3032 is defined within the support portion 303 ;

[0120] A passage 3021 extends through the outer tube main section 302 , with the distal end of the passage 3021 communicating with the reservoir 3032 and the proximal end of the passage 3021 connected to the handle;

[0121] The support part 303 is injected with a medium into the storage cavity 3032 through the passage 3021 to expand the support part 303, or the medium is extracted from the storage cavity 3032 through the passage 3021 to shrink the support part 303. Specifically, the support part 303 in the embodiment of the present invention is a balloon.

[0122] Please refer to Figure 11 The tee piece 110 is installed on the right shell 104 of the handle body 1 , and the tee piece 110 is used to connect the water path or the gas path so as to facilitate the introduction of liquid or gas into the support portion 303 .

[0123] For details, please continue to refer to Figures 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 section 302. This non-concentricity enables the support portion 303 to have one or more connection ends connected to the passage 3021 on the outer tube main section 302. The connection ends are sealed with the mouth of the passage 3021. In this embodiment, there is only one connection end, which can be a connection port to facilitate communication with the passage 3021. The non-concentricity enables the support portion 303 to be eccentrically arranged with the outer tube main section 302. The eccentric arrangement allows the support portion 303 to expand and prop up in only one direction when it expands. The expansion of the support portion 303 drives the entire section of the medical catheter to move and adhere to the intestinal wall. The support portion 303 expands the intestinal space, thereby increasing the distance between the inner tube 2 and the nipple, providing space and stability for the operation of the inner tube 2.

[0124] For further information, please refer to Figure 4 and Figure 5 A third wire drawing hole 306 and a lumen 3022 are provided on the outer tube main body section 302. The lumen 3022 is used for the inner tube 2 to pass through. A second wire drawing hole 3051 is also provided on the outer tube head section 305. A wire drawing hole is also provided in the outer tube bending section 304 and corresponds to the third wire drawing hole 306 and the second wire drawing hole 3051, so as to allow the outer tube wire 301 to pass through. Referring to FIG2 , an opening 3054 and an inner tube mounting hole 3053 are provided on the outer tube head section 305. The opening 3054 is provided along the axial direction of the outer tube head section 305. The inner tube mounting hole 3053 and the opening 3054 are connected to each other. By utilizing the opening 3054, the inner tube 2 can be bent at a larger angle in a certain direction, which is convenient for the user to operate.

[0125] For further information, please refer to Figure 4 and Figure 5A second light source 3052 is also provided on the outer tube tip section 305 of the medical catheter 3. This second light source 3052 is preferably an LED or optical fiber. This light source illuminates the large stomach space when the inner tube 2 and medical catheter 3 are inserted together. A wiring hole for power lines is also provided in the outer tube curved section 304 and the outer tube main section 302. This wiring hole connects to the LED or optical fiber to provide power. The specific arrangement of the wiring hole and the specific structure of the second light source 3052 are well known to those skilled in the art and are not described in detail herein.

[0126] The specific structure of the inner tube 2 is described below:

[0127] Please refer to Figures 6 to 9 The inner tube 2 includes an inner tube main section 201, an inner tube curved section 202 and an inner tube head section 203. The distal end of the inner tube main section 201 is connected to the proximal end of the inner tube curved section 202, and the distal end of the inner tube curved section 202 is connected to the proximal end of the inner tube head section 203. The inner tube main section 201 has:

[0128] The first passage is used for disposing a medical device, so that the medical device can pass through and move along the first passage. In the embodiment of the present invention, the medical device is a biopsy forceps.

[0129] and at least one second passage arranged outside the first passage, the second passage being used for configuring a medium and passing into the circuit, wherein the medium is specifically a liquid medium or a gaseous medium.

[0130] Specifically, the inner tube main section 201 is a flexible main tube, and the inner tube curved section 202 is a multi-lumen tube. The multi-lumen tube is softer than the flexible main tube and has the same cross-section as the flexible main tube. In other embodiments of the present invention, the inner tube curved section 202 may also be a curved section comprising multiple interconnected curved sections, with the structure of the multi-lumen tube or the curved section being based on existing technologies.

[0131] The first passage and the second passage are both arranged along the axial direction of the inner tube main section 201. The first passage and the second passage are both hole structures and / or tube structures that penetrate the inner tube main section 201.

[0132] The specific structure of the first channel is described below:

[0133] Please refer to Figure 9 The first channel is a first hole 2011 that penetrates axially on the inner tube main section 201. In the embodiment of the present invention, the first hole 2011 is a circular hole. In other embodiments of the present invention, the first hole 2011 can be any shape other than a circular hole.

[0134] For further information, please refer to Figure 7In another optional embodiment of the present invention, the first channel is a first tube 204 that is arranged through the inner tube main section 201, wherein the first tube 204 is embedded in the first hole 2011, and a first cavity 2041 is formed inside the first tube 204. In this embodiment, the first hole 2011 is used to install the first tube 204, and the first cavity 2041 is used to pass the instrument and allow the instrument to move.

[0135] The specific structure of the second channel is described below:

[0136] Please refer to Figure 8 and Figure 9 The second passage creates an open structure on the inner tube main section 201. This open structure includes an opening along the outer side of the inner tube main section 201, which is radially recessed toward the center of the inner tube main section 201. Specifically, in this embodiment of the present invention, there are two openings: a first opening 2013 and a second opening 2014. The first opening forms a second surface 2015 on the inner tube main section 201.

[0137] The outer side of the inner tube main section 201 is covered with at least one outer layer structure. In this embodiment of the present invention, the outer layer structures are a first outer layer 207 and a second outer layer 208. The first outer layer 207 is specifically a braided layer, and the second outer layer 208 is specifically a skin layer. The first outer layer 207 covers the outer side of the inner tube main section 201, 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, a portion of the inner side of the first outer layer 207 closes the first opening 2013 and the second opening 2014, forming a closed area.

[0138] Please continue to refer to Figure 8 In another optional embodiment of the present invention, the second passage may also be a third tube 2053 provided at the first opening 2013 and a second tube 2051 provided at the second opening 2014, wherein the third tube 2053 has a third cavity 2054 for medium circulation, and the second tube 2051 has a second cavity 2052 for setting up a circuit.

[0139] The second tube 2051 has one side that fits in place with the recessed portion of the opening and has a matching shape. Specifically, the second tube 2051 and the third tube 2053 are preferably elliptical in design, so that the second cavity 2052 inside the second tube 2051 and the third cavity 2054 inside the third tube 2053 also form elliptical cavities, thereby increasing the amount of gas or liquid flow when the second passage is used to pass gas or liquid.

[0140] The first and second passages are independently provided, allowing the second passage, which allows for the passage of an electrical circuit, liquid, or gas, to no longer occupy the space provided by the first passage in the inner tube main section 201. This allows the inner diameter of the first passage, i.e., the first hole 2011 or the inner diameter of the first tube 204, to be larger. Without changing the outer diameter of the inner tube main section 201, the inner diameter of the first hole 2011 or the inner diameter of the first tube 204 can be expanded to 1.2 mm to 2.8 mm (the original conventional structure only has a diameter of 1.2 mm). Preferably, the diameter of the first hole 2011 is 1.8 mm, nearly doubling its area. This allows conventional 1.5 mm outer diameter biopsy forceps to be used flexibly, significantly increasing the sample volume and reducing the number of sampling attempts. This also expands the range of applications for instruments such as stents and stone removal baskets.

[0141] For further information, please refer to Figure 9 At least one second hole 2012 is also defined in the inner tube main section 201. The inner diameter of the second hole 2012 is smaller than that of the first hole 2011. The second hole 2012 is used to pass a pull wire that controls the bending of the inner tube bending section 202. In this embodiment of the present invention, there are four second holes 2012 to correspond to the inner tube bending section 202 of the inner tube 2, which can be controlled by a handle and moved up, down, left, or right. Specifically, the pull wires in the second holes 2012 are configured as an upper wheel pull wire 131 and a lower wheel pull wire 124. Accordingly, in another embodiment of the present invention, the second hole 2012 can also be replaced by a fourth tube 206, with a pull wire disposed within the fourth tube 206, to similarly enable the inner tube bending section 202 to be controlled by a handle and moved up, down, left, or right.

[0142] For further information, please refer to Figure 2 The inner tube head section 203 defines a third hole 2031, which extends through the inner tube head section 203 and communicates with the second passage, specifically, the second cavity 2052 in the second tube 2051. A fourth hole 2033 extends through the inner tube head section 203 and communicates with the first passage, specifically, the first cavity 2041 in the first tube 204. The inner tube head section 203 also defines a first mounting port 2032 and a second mounting port 2034, respectively. The first mounting port 2032 is used to mount a camera assembly 2035, and the second mounting port 2034 is used to mount a first light source 2036.

[0143] Please refer to Figure 10In another optional embodiment of the present invention, a second passage is disposed within the first passage. Specifically, a fifth hole 209 is formed in the inner tube main section 201. The first passage is specifically the first tube 204 disposed within the fifth hole 209. The first tube 204 has a first lumen 2041 for receiving a medical device. The second passage is specifically the second tube 2051 disposed within the fifth hole 209 and the space within the fifth hole 209 excluding the first and second tubes 204 and 2051. The second tube 2051 serves as a second passage for installing circuits / wires, and the space within the hole excluding the first and second tubes 204 and 2051 serves as another second passage for transporting liquid or gaseous media. The space within the hole, as a free cavity, improves the space utilization of the entire inner tube main section 201, allowing the inner diameter of the first tube 204 to be expanded to 1.8 mm without increasing the overall outer diameter of the inner tube 2, thereby achieving the same technical effect as the previous embodiment.

[0144] The specific structure of the handle is described below:

[0145] Please refer to Figure 11 , the handle of the embodiment of the present invention includes:

[0146] 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 an outer tube transition connector 135. The inner tube 2 enters the interior of the handle body 1 through the channel hole 143 and enters the medical catheter 3 from the distal end of the medical catheter 3 for use in conjunction with the medical catheter 3.

[0147] For details, please refer to Figure 10 The handle body 1 is composed of a left shell 103 and a right shell 104 fixedly connected.

[0148] The specific structure of the external control bending mechanism is described below:

[0149] Please refer to Figure 11 and Figure 12 The handle also includes an external control bending mechanism, which is arranged inside the handle body 1. The external control bending mechanism is used to control the curvature of the medical catheter 3, specifically to control the curvature of the proximal end of the medical catheter 3.

[0150] Please continue to refer to Figure 11 and Figure 12 , the external control bending mechanism includes:

[0151] a first rotating portion;

[0152] a first movable portion, the first movable portion being connected to the first rotating portion, the rotating portion being provided with a rotating pair and being movable between a first position and a second position through the movable portion;

[0153] The outer tube pull wire 301 has a distal end connected to the movable portion, and a proximal end of the outer tube pull wire 301 extends into the medical catheter 3 and is connected to the proximal end of the medical catheter 3 .

[0154] The specific structure of the first rotating part in the external control bending mechanism is described below:

[0155] Please refer to Figure 16 Specifically, the first rotating part in the handle of the embodiment of the present invention specifically adopts a forceps lifter handle 105 and a forceps lifter turntable 106, wherein the forceps lifter handle 105 and the forceps lifter turntable 106 are clamped and kept coaxial.

[0156] The specific structure of the first movable part in the external control bending mechanism is described below:

[0157] Please continue to refer to Figure 11 and Figure 12 and Figure 16 The first movable part includes a forceps lifting rod 113, a forceps lifting slider 115 and a forceps lifting slide 116. One end of the forceps lifting rod 113 is connected to the forceps lifting turntable 106 through a forceps lifting rod buckle 112, and the other end of the forceps lifting rod 113 is connected to the forceps lifting slider 115 through a slider buckle 114. The forceps lifting slider 115 is installed in the buckle sliding groove 1161 of the forceps lifting slide 116, and the forceps lifting slide 116 is fixed to the right shell 104 through multiple fasteners.

[0158] For further information, please refer to Figure 12 A pull wire hole 1162 is opened on one side of the buckle sliding groove 1161. The pull wire hole 1162 is located at the lower part of the lifting forceps slide 116, so that the outer tube pull wire 301 passes through the pull wire hole 1162 and extends into the medical catheter 3 to connect with the proximal end of the medical catheter 3.

[0159] The structure of the inner control bending mechanism is described below:

[0160] An internal bending control mechanism is also disposed within the handle body 1 and is used to control the curvature of the inner tube 2. Specifically, the internal bending control mechanism in the handle of the embodiment of the present invention controls the curvature of the proximal end of the inner tube 2 in four directions: upward, downward, left, and right. However, as those skilled in the art will appreciate, depending on different usage environments, the internal bending control mechanism may also control curvature in only one direction, in addition to multiple directions.

[0161] The internal bending control mechanism includes at least one set of control components, each used to control the proximal end of the inner tube 2 in two directions. To achieve bending of the proximal end of the inner tube 2 in four directions (up, down, left, and right), the internal bending control mechanism in the handle of this embodiment of the present invention employs two sets of control components. To prevent the two sets of control components from interfering with each other during rotation, the internal bending control mechanism also includes a wheel baffle 133, which is fixed within the left housing 103. The control components are disposed on either side of the wheel baffle 133, specifically, on the upper and lower sides of the wheel baffle 133.

[0162] The control component includes:

[0163] The second rotating part is rotatably disposed in the handle body 1 .

[0164] a first elastic member, the first elastic member being connected to the second rotating portion, the rotating portion being provided with a rotating pair and being movable between a third position and a fourth position via the first elastic member;

[0165] At least one inner tube pulling wire, the proximal end of the inner tube pulling wire is connected to the elastic member, and the distal end of the inner tube pulling wire extends into the inner tube 2 and is connected to the proximal end of the inner tube 2.

[0166] The following describes the specific structure of the first set of control components in the internal control bending mechanism:

[0167] Please refer to Figure 13 Specifically, the second rotating portion in the handle of the embodiment of the present invention is a lower disc 119, which is rotatably mounted on the left housing 103. The first elastic member is a lower disc spring leaf 121, which is fixedly connected to the lower disc 119 at its center via a fastener. The ends of the lower disc spring leaf 121 are respectively welded to the distal end of a lower disc cable 124, the proximal end of which extends into the inner tube 2 and connects to the proximal end of the inner tube 2.

[0168] Please refer to Figure 13 Furthermore, in order to ensure that the lower wheel cable 124 does not bend during the movement, at least one lower wheel cable buckle 125 is also provided in the left shell body 103, and a positioning port for positioning the lower wheel cable 124 is provided in the lower wheel cable buckle 125 for the lower wheel cable 124 to pass through.

[0169] Please continue to refer to Figure 13Furthermore, the left housing 103 is further provided with an inner tube connector 134, to which the distal end of the inner tube 2 is connected. The inner tube 2 extends from the inner tube connector 134 and enters the passage hole 143 into the interior of the handle body 1. The tube body of the inner tube 2 between the passage hole 143 and the inner tube connector 134 forms an inner tube ring. By adjusting the size of the inner tube ring, the extension and retraction of the inner tube head section 203 of the inner tube 2 can be controlled.

[0170] Please continue to refer to Figure 13 Furthermore, a lower wheel disc rib 118 is fixed to the left housing 103 near the lower wheel disc spring piece 121. The lower wheel disc rib 118 clamps the lower wheel disc spring piece 121 in the gap between the lower wheel disc rib 118 and the lower wheel disc 119. The lower wheel disc rib 118 confines the lower wheel disc spring piece 121 to the inner side of the lower wheel disc rib 118, thereby preventing the lower wheel disc spring piece 121 from bouncing up incorrectly.

[0171] Please continue to refer to Figure 13 Furthermore, the inner control bending mechanism also includes at least two lower wheel disc spring plate positioning plates 122. Preferably, the handle in this embodiment of the present invention includes three lower wheel disc spring plate positioning plates 122. Adjacent lower wheel disc spring plate positioning plates 122 are spaced apart and fixed to the lower surface of the wheel disc baffle 133. Lower wheel disc spring plate sliding grooves 123 are formed between adjacent lower wheel disc spring plate positioning plates 122. These lower wheel disc spring plate sliding grooves 123 prevent friction between the lower wheel disc spring plate 121 and the left housing 103 and other components of the left housing 103.

[0172] The following describes the specific structure of the second set of control components in the internal control bending mechanism:

[0173] The second set of control components has the same structure and arrangement as the first set of control components, except that the installation method of each structure is as follows:

[0174] Please refer to Figure 14 and Figure 16The second rotating part in the second set of control components is the upper wheel disc 127, which is sleeved on the shaft end of the lower wheel disc 119, and the shaft end of the lower wheel disc 119 extends from the shaft end of the upper wheel disc 127. The upper wheel disc rib 126, three upper wheel disc spring sheet positioning plates 129 and multiple upper wheel disc pull wire buckles 132 are all fixed on the upper surface of the wheel disc baffle 133, and the upper wheel disc spring sheet 128 is clamped between the upper wheel disc rib 126 and the upper wheel disc 127. The two ends of the upper wheel disc spring sheet 128 respectively extend into the upper wheel disc spring sheet sliding groove 130 between adjacent upper wheel disc spring sheet positioning plates 129, and the two ends of the upper wheel disc spring sheet 128 are respectively connected to the distal end of an upper wheel disc pull wire 131, and the proximal end of each upper wheel disc pull wire 131 passes through the upper wheel disc pull wire buckle 132 and extends into the inner tube 2 and extends to be connected with the proximal end of the inner tube 2.

[0175] Please continue to refer to Figure 14 An inner tube channel 117 is further provided inside the left housing 103 . The upper end of the inner tube channel 117 is communicated with the channel hole 143 , and the lower end of the inner tube channel 117 extends into the outer tube transition connector 135 .

[0176] Please refer to Figure 15 The internal control bending mechanism also includes a cable cover 136, which is secured to the upper surface of the wheel disc baffle 133 via fasteners. This covers the upper wheel disc spring plate positioning plate 129 on the upper surface of the wheel disc baffle 133, preventing the upper wheel disc cable 131 from contacting other components and causing unnecessary friction. This improves the service life of the upper wheel disc cable 131 and prevents wear. Furthermore, the cable cover 136 also serves as a limiter, confining the upper wheel disc spring plate 128 within the internal space of the cable cover 136.

[0177] The external control bending self-locking mechanism 102 is described below.

[0178] In order to ensure that the curvature of the medical catheter 3 can be maintained at the curvature after being controlled by the external bending control mechanism, the handle is further provided with an external bending control self-locking mechanism 102, and the external bending control self-locking mechanism 102 includes:

[0179] A pressing portion, the pressing portion is provided in the handle body 1;

[0180] The third rotating part is rotatably disposed in the handle body 1 . When the pressing part is pressed, the third rotating part can be rotated relative to the handle body 1 and engaged with the first rotating part.

[0181] For details, please refer to Figure 12The pressing portion is specifically a spring pin 10201, which is mounted on the upper portion of the right housing 104, wherein the pin portion of the spring pin 10201 extends into the right housing 104. The third rotating portion is specifically a limiting rod 10202, and a second limiting buckle 10203 is fixed to the right housing 104. The limiting rod 10202 and the second limiting buckle 10203 are loosely matched, allowing the limiting rod 10202 to rotate relative to the second limiting buckle 10203.

[0182] The usage process of the above-mentioned external control 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 applies pressure to the limit rod 10202, so that the limit rod 10202 rotates along the second limit buckle 10203 and contacts the forceps lifter turntable 106, thereby limiting the rotation of the forceps lifter turntable 106 to achieve self-locking of the medical catheter 3 at any curvature.

[0183] Please refer to Figure 12 To achieve self-locking of the proximal bend of the medical catheter 3 at a specific angle, a plurality of latches 102021 are provided on the side of the limit rod 10202 contacting the forceps elevator rotary disk 106. Furthermore, a plurality of tooth grooves 1061 are provided on the outer side of the forceps elevator rotary disk 106 contacting the limit rod 10202 to engage with the latches 102021. The spacing between each latch 102021 or each tooth groove 1061 can be large or small. A large spacing allows the proximal bend of the medical catheter 3 to be switched between large angles, such as 30°, 60°, and 90°. Conversely, a small spacing allows the proximal bend of the medical catheter 3 to be switched between small angles, such as 5°, 10°, and 15°.

[0184] The tooth-groove structure on the above-mentioned forceps lifter turntable 106 and the limit rod 10202 can also be changed according to different usage scenarios. For example, soft protrusions can be used to abut against each other, and the present invention is not limited to the above-mentioned tooth-groove 1061 on the forceps lifter turntable 106 or the locking tooth 102021 on the limit rod 10202. As long as it is any structure that can achieve the locking connection between the forceps lifter turntable 106 and the limit rod 10202 when in contact, the present application does not impose any restrictions on this.

[0185] 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 body 1, which can realize the locking of the inner tube 2 in any direction of up, down, left or right.

[0186] The structure of the embodiment 1 of the inner control bending self-locking mechanism includes:

[0187] The fourth rotating part is rotatably arranged in the handle body 1. For details, please refer to Figure 18 The fourth rotating portion includes a pressure rod 144 and a locking handle 145. The locking handle 145 is threadedly connected to the upper end of the pressure rod 144. The lower end of the pressure rod 144 is threadedly connected to a threaded hole in the upper portion of the left housing 103. The lower end of the pressure rod 144 is connected to the proximal end of a locking plate 147. Two adjacent locking plates 147 are adjacent to each other and connected to the shaft seat 146 via the same shaft 1461. One locking plate 147 is close to the outer side of the lower wheel disc 119, and the other locking plate 147 is close to the outer side of the upper wheel disc 127. A spring 148 is also connected between the pair of locking plates 147. The distal ends of the pair of locking plates 147 on the spring 148 can be opened relative to each other to loosen the upper wheel disc 127 and the lower wheel disc 119.

[0188] The working process of the internal control bending mechanism described in Example 1 is as follows:

[0189] By turning the locking handle 145, the locking handle 145 rotates the pressure rod 144 and causes the rod 144 to move slightly downward through the thread. During this movement, the adjacent locking pieces 147 rotate about the axis 1461, causing the distal ends of the adjacent locking pieces 147 to close relative to each other and respectively hold the upper wheel disc 127 and the lower wheel disc 119, thereby achieving self-locking of the inner tube 2 in any direction. In the non-self-locking state, the spring 148 allows the distal ends of the adjacent locking pieces 147 to open relative to each other and contact the upper wheel disc 127 and the lower wheel disc 119, thereby achieving self-locking.

[0190] The specific structure of the second embodiment of the internal control bending self-locking mechanism is described below. The internal control bending self-locking mechanism is arranged on the outside of the handle body 1.

[0191] Please refer to Figure 16 and Figure 17 In the second embodiment, the inner control bending self-locking mechanism includes a fixed shaft 120, one end of the fixed shaft 120 is connected to the fixed shaft mounting hole 1191 of the lower wheel disc 119, and the lower wheel disc 119 is connected to the lower wheel disc knob 108, and the upper wheel disc 127 is connected to the upper wheel disc knob 107.

[0192] Please refer to Figure 16 and Figure 17, further comprising a fifth rotating portion, which is rotatably disposed on the fixed shaft 120. Specifically, the fifth rotating portion is composed of a rotation limit block 140 and a fixed limit block 141. The rotation limit block 140 is externally connected to the locking knob 109. A protrusion 1401 is provided on the lower surface of the rotation limit block 140. The fixed limit block 141 has a first surface 1411 that is formed incrementally from low to high, opposite to the rotation limit block 140. The first surface 1411 allows the rotation of the rotation limit block 140 to be converted into axial movement of the fixed limit block 141. The fixed limit block 141 and the rotation limit block 140 are respectively loosely fitted with one end of the fixed shaft 120, and the end of the fixed shaft 120 is screwed via a lock nut 139 to prevent the rotation limit block 140 from detaching from the fixed shaft 120.

[0193] Gasket. Since there are two sets of control components in the handle of the embodiment of the present invention, two gaskets are used, namely the first locking gasket 1421 and the second locking gasket 1422. The first locking gasket 1421 is placed in the opening on the back of the fixed limit block 141, and the second locking gasket 1422 is arranged between the upper wheel knob 107 and the lower wheel knob 108, and the second locking gasket 1422 is clearance-matched with the axial end of the lower wheel 119, and the outer diameter of the second locking gasket is larger than the center hole diameter of the lower wheel knob.

[0194] The working process of the inner control bend locking mechanism described in Example 2 is as follows:

[0195] Please refer to Figure 16 and Figure 17 , the rotating locking knob 109 drives the rotation limit block 140 to rotate. After the rotation limit block 140 rotates along the first surface 1411, the fixed limit block 141 is subjected to an axial extrusion force to achieve axial movement. Since the first locking washer 1421 is provided on the back of the fixed limit block 141, the first locking washer 1421 is squeezed and applies axial pressure to the lower wheel disc 108. The lower wheel disc knob 108 moves under the extrusion force. During the movement, the first locking washer 1421 is compressed and deformed. After the deformation, the first locking washer 1421 increases the damping and holds the shaft end of the lower wheel disc 119, preventing it from rotating. At the same time, after being squeezed, the lower wheel knob 108 moves axially at the axial end of the lower wheel 119 and contacts the upper wheel knob 107, so that the inner diameter of the second locking gasket 1422 at the upper wheel knob 107 shrinks radially and hugs the axial end of the upper wheel 127, thereby locking the upper wheel 127, thereby achieving locking of the curvature of the upper wheel 127 and the lower wheel 119.

[0196] Next, the inner tube locking mechanism 101 will be described.

[0197] In order to limit further movement of the inner tube 2 relative to the medical catheter 3, the handle body 1 is further provided with an inner tube locking mechanism 101. The inner tube locking mechanism 101 is provided on the outside of the handle body 1 and close to the passage hole 143. The structure of the inner tube locking mechanism 101 in the first embodiment is as follows:

[0198] The inner tube locking mechanism 101 has a first fixed portion and a first rotating portion rotatably connected to the first fixed portion, wherein the first rotating portion is provided with a rotating pair so as to rotate relative to the first fixed portion;

[0199] The invention also includes a clamping part, which is arranged between the first fixing part and the first rotating part. After the first rotating part rotates, it applies pressure to the clamping part, and the clamping part is pressed and squeezes the inner tube in the radial direction.

[0200] For details, please refer to Figure 19 The first fixing part is specifically a locking seat 10102, and the first rotating part is specifically a locking nut 10100. One end of the locking seat 10102 has an external thread 101020, and the locking nut 10100 has an internal threaded hole 101001 that can be threadedly connected to the external thread 101020. The internal threaded hole 101001 passes through the locking nut 10100, and a through hole for the inner tube to pass through is also provided on the locking seat 10102. An inner tube locking gasket 10101 is arranged between the locking seat 10102 and the locking nut 10100. The outer diameter of the inner tube locking gasket 10101 can match the aperture of the internal threaded hole 101001. The material of the inner tube locking gasket 10101 is not limited to silicone, rubber, etc. A first clamping hole 101010 for the inner tube 2 to pass through is also provided on the inner tube locking gasket 10101.

[0201] The specific working process of the inner tube locking mechanism 101 described in Example 1 is as follows:

[0202] Locking nut 10100 is screwed forward onto external thread 101020 of locking seat 10102. During this screwing process, locking nut 10100 gradually compresses inner tube locking washer 10101, causing the diameter of first clamping hole 101010 of inner tube locking washer 10101 to gradually decrease, thereby gripping the outer diameter of inner tube 2 and thereby locking inner tube 2. Conversely, when locking nut 10100 is rotated in the reverse direction, inner tube locking washer 10101 is no longer squeezed, and the diameter of the through hole in inner tube locking washer 101101 is reset, thereby loosening inner tube 2 and allowing it to move relative to medical catheter 3.

[0203] The specific structure of the inner tube locking mechanism 101 described in the second embodiment is as follows:

[0204] Please refer to Figures 20 to 22, including a clamping seat 10104 and a clamping part, a rotating disk 10105 and a fixed disk 10108 are set in the clamping seat 10104, and the clamping part is an adjustable clamping assembly composed of multiple clamping plates 10109, and a second clamping hole 101093 is formed between each clamping plate 10109. The adjustable clamping assembly is rotated and driven by the rotating disk 10105 to perform an opening and closing movement, so that the aperture of the second clamping hole 101093 changes radially.

[0205] Among them, the rotating disk 10105 has a first connecting part, which is a first sliding groove 101052 opened on the rotating disk 10105, and a second connecting part corresponding to the first connecting part is set on one side of each clamping piece 10109. The second connecting part is specifically a first protrusion 101091 protruding along one side of the clamping piece 10109.

[0206] 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.

[0207] Please continue to refer to Figures 20 to 22 , there is a third connecting part on the fixed disk 10108, the third connecting part is a second sliding groove 101081 opened on the fixed disk 10108, and a second protrusion 101092 is set on the other side of the clamping plate 10109 to be connected to the second sliding groove 101081. When the second protrusion 101092 on the clamping plate 10109 rotates, it moves along the second sliding groove 101081.

[0208] The multiple clamping pieces 10109 constituting the adjustable clamping assembly are evenly distributed along the circumference, and adjacent clamping pieces 10109 are partially tangent and form the same angle, so that there is no gap between each clamping piece 10109 during the radial opening and closing movement of the adjustable clamping assembly.

[0209] The rotating disk 10105 also has a handle mounting opening 101051 for receiving the rotating handle 10107. A rotating disk through-opening 101053 is also provided at the axis of the fixed disk 10108, and a fixed disk through-opening 101082 is also provided at the axis of the rotating disk. These rotating disk through-openings 101053 and fixed disk through-openings 101082 are used to pass through the inner tube 2. A clamping seat 10104 is sleeved onto the outside of the rotating disk 10105 and has a first radially extending position-limiting buckle 10103 on the clamping seat 10104. At least one anti-rotation buckle groove 10106 is provided on the outside of the rotating disk 10105 and is used to engage with the first position-limiting buckle 10103 to limit the rotation of the rotating disk 10105.

[0210] The specific structure of the inner tube locking mechanism 101 described in the third embodiment is as follows:

[0211] The inner tube locking mechanism 101 includes a second fixing portion and a second rotating portion hinged to the second fixing portion, and the second fixing portion is connected to the other end of the second rotating portion that is not connected via a fastening device.

[0212] Please refer to Figure 23 Specifically, the second fixing portion comprises a fixed end 10112, and the second rotating portion comprises a clamping end 10110. Both the fixed end 10112 and the clamping end 10110 have semicircular clamping openings 10114 adapted to the outer diameter of the inner tube 2. One end of the fixed end 10112 is hingedly connected to one end of the clamping end 10110 via a hinge 10111, and threaded holes are respectively defined at the other ends of the fixed end 10112 and the clamping end 10110. The aforementioned fastening device comprises a threaded clamping handle 10113. By rotating the clamping handle 10113 to connect with the threaded ends of the clamping end 10110 and the fixed end 10112, the clamping end 10110 applies pressure relative to the fixed end 10112 and securely holds the inner tube 2.

[0213] The specific structure of the inner tube locking mechanism 101 described in the fourth embodiment is as follows:

[0214] Please refer to Figure 24 , a first part, the first part is connected to the handle body 1, and a hole is opened on the first part.

[0215] The second part covers the movable end of the inner tube and can be abutted against the first part through a protruding structure or clamped with a tooth-groove structure.

[0216] For details, please refer to Figure 24 The first part is specifically a sleeve 10116, which is arranged on the handle body 1, and a hole is opened on the sleeve 10116 for the inner tube 2 to extend into.

[0217] The second part is specifically a sleeve 10115, and the sleeve 10115 covers the moving end of the inner tube 2.

[0218] Specifically, the protruding structure refers to at least one protrusion arranged on the inner wall of the hole and at least another protrusion arranged on the outside of the sleeve 10115. The protrusion is a soft structure. By matching the sleeve 10115 with the hole on the sleeve 10116, the protrusion on the inner wall of the hole is abutted against the other protrusion on the outside of the sleeve 10115, so that the friction between the sleeve 10115 and the sleeve 10116 is increased to achieve fixation of the inner tube 2.

[0219] Specifically, the tooth-groove structure refers to at least one second tooth 10118 arranged on the outside of the sleeve 10115 and at least one groove arranged on the inner wall of the hole of the sleeve 10116, or it can also be at least one first tooth 10117 arranged on the inner wall of the hole of the sleeve 10116 and at least one groove arranged on the outside of the sleeve 10115. The tooth-groove structure can also increase the friction between the sleeve 10115 and the sleeve 10116 to achieve fixation of the inner tube 2.

[0220] The specific use process of the medical device is described below:

[0221] Step 1: Please refer to Figure 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, and slowly push the inner tube 2 until it enters the medical catheter 3 and extends 4 to 5 cm from the distal end of the medical catheter 3 (in this state, the inner tube curved section 202 of the inner tube 2 is fully extended).

[0222] 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, further causing the first clamping hole 101010 to radially clamp the inner tube 2, thereby fixing the relative position of the inner tube 2 with respect to the medical catheter 3. The camera assembly 2035 and first light source 2036 on the inner tube 2 and the second light source 3052 on the medical catheter 3 are activated for illumination and imaging. The user holds the handle with their left hand and the body of the medical catheter 3 with their right hand, approximately 20 to 30 cm away from the outer tube tip 305 of the medical catheter 3. The medical catheter 3 is then inserted into the patient's mouth.

[0223] Step 2: Please refer to Figure 26 and Figure 27 While pushing the medical catheter 3 with the right hand, the left hand fingers are constantly used to rotate the upper wheel 127 and the lower wheel 119 to control the curvature of the inner tube 2. The specific process is as follows:

[0224] Please refer to Figures 13 to 15 Taking one set of control components as an example, the upper wheel knob 107 is rotated, and the upper wheel knob 107 drives the upper wheel 127 to rotate, thereby controlling the upper wheel spring piece 128 to move in the upper wheel spring piece sliding groove 130. The movement of the upper wheel spring piece 128 further drives the upper wheel pull wire 131 to move. Since the upper wheel pull wire 131 penetrates the first cavity 2041 of the first tube 204 in the inner tube main section 201 of the inner tube 2 and is connected to the inner tube curved section 202, when the upper wheel pull wire 131 moves, it can drive the inner tube curved section 202 to move to control the inner tube curved section 202 to bend. In conjunction with the image feedback from the camera assembly 2035, it passes through the esophagus into the stomach, uses the first light source 2036 and the second second light source 3052 to illuminate the stomach space, and then passes through the pylorus into the duodenum.

[0225] Step 3: Please refer to Figure 11 and Figure 28 Using a syringe, gas or liquid is injected through the balloon valve 111 at the rear of the handle into the passage 3021 of the medical catheter 3 through the tubing. The gas or liquid passes through the passage 3021 and enters the reservoir 3032 of the support portion 303, causing the support portion 303 to expand. After expansion, the support portion 303 props up the space inside the duodenum. In other embodiments of the present invention, a water and gas injection tube 137 can also be connected to the passage 3021 through a tubing to deliver gas or liquid through the passage 3021 into the reservoir 3032 of the support portion 303.

[0226] Step 4: Please refer to 29 and use your left hand to operate the handle to bend the medical catheter. The specific process of bending the medical catheter is as follows:

[0227] The specific working process of the external control bending mechanism is as follows:

[0228] Please refer to Figure 11 and Figure 12 The user operates the forceps lifter handle 105, which drives the forceps lifter turntable 106 to rotate. The forceps lifter turntable 106 is assigned a rotating pair and, through the forceps lifter pull rod 113, the rotating pair is converted into a moving pair, which causes the forceps lifter slider 115 to reciprocate within the snap sliding groove 1161 of the forceps lifter slide 116. During the movement, the forceps lifter slider 115 drives the proximal end of the medical catheter 3 to bend via the outer tube pull wire 301, thereby providing a baffle effect when the proximal end of the medical catheter 3 bends, thereby changing the forward direction of the inner tube 2 that cooperates with the medical catheter 3. During the process of advancing the endoscope into the duodenum, the original direct viewing direction is changed to the side viewing direction, allowing the inner tube 2 to align with the papilla on the side wall of the descending duodenum and continue to advance toward the common bile duct. The inner tube 2 is retracted by the control component until it is aligned with the outer tube head section 305 of the medical catheter 3. The relative positions of the inner tube 2 and the medical catheter 3 are fixed again by the inner tube locking mechanism 101 .

[0229] When the outer tube bending section 304 of the medical catheter 3 is bent by 90 degrees, the inner tube 2 is also bent by about 90 degrees along with the medical catheter 3 because the inner tube 2 is located in the medical catheter 3. Figure 29 The viewing direction of the inner tube head section 203 of the inner tube 2 is changed from being in the same direction as the medical catheter 3 to being perpendicular to the medical catheter 3, forming a side-view observation effect. The user continues to slowly insert the medical catheter 3 with his right hand until he finds the nipple structure on the side wall of the twelve straight descending sections.

[0230] Please refer to Figure 31The inner tube locking mechanism 101 is released, allowing the inner tube 1 to continue to penetrate deeper. The inner tube bending mechanism continues to control the bending angle of the inner tube curved section 202 of the inner tube 2, so that the nipple appears in the field of view of the inner tube head section 203 of the inner tube 2. A guide wire is inserted through the instrument channel of the handle and sequentially passes through the first lumen 2041 of the inner tube main section 201 of the inner tube 2, through the inner tube curved section 202, and out of the fourth hole 2033. The guide wire is observed entering the bile duct or pancreatic duct based on the image transmitted back by the camera assembly 2035.

[0231] If the nipple opening is less, a cutting knife or a nipple expansion balloon can be inserted along the guide wire to expand the nipple opening. The inner tube head section 203 of the inner tube 2 is progressively advanced to search for calculus or suspicious tumor protrusion.

[0232] Step 5: After the stone is found, the guide wire is pulled out and the optical fiber or electrode is inserted along the first passage of the inner tube 2. Specifically, the optical fiber or electrode is sequentially passed through the first cavity 2041 in the first tube 204 of the inner tube 2 through the inner tube bending section 202 and extended from the fourth hole 2033 to perform laser lithotripsy or electrohydraulic lithotripsy.

[0233] Please continue to refer to Figure 32 When a suspicious tumor protrusion is found, the guide wire can be pulled out and the biopsy forceps can be inserted. The biopsy forceps passes through the first cavity 2041 in the first tube 204 of the inner tube 2 through the inner tube curved section 202 and extends from the fourth hole 2033 to perform tissue biopsy.

[0234] After the operation, the gas or liquid in the storage cavity 3032 of the support portion 303 is extracted through the suction port 138 using a syringe, and then the inner tube 2 and the medical catheter 3 are pulled out of the human body together.

[0235] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0236] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A medical catheter comprising an outer tube main section, an outer tube curved section, and an outer tube head section, wherein the proximal end of the outer tube head section is connected to the distal end of the outer tube curved section, the proximal section of the outer tube curved section is connected to the distal end of the outer tube main section, and the proximal end of the outer tube main section is connected to a handle, characterized in that: It also includes a support portion, which is at least one and is arranged at the distal end of the outer tube main body segment; the outer tube main body segment also has a passage, the distal end of the passage is connected to the support portion, and the proximal end of the passage is connected to the handle; the first center of the support portion is not concentric with the second center of the outer tube main body segment, and the non-concentricity enables the support portion to have one or more connecting ends connected to the passage on the outer tube main body segment; and the non-concentricity causes the support portion and the outer tube main body segment to be eccentrically arranged.

2. The medical catheter according to claim 1, 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.

3. A medical device, characterized in that: The medical catheter comprises the medical catheter according to any one of claims 1 to 2, and an inner tube and a handle used in conjunction with the medical catheter, wherein 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 channel of the handle and penetrates the medical catheter and extends from the distal end of the medical catheter.

4. The medical device according to claim 3, wherein: The handle includes a handle body having a passage hole and an inner tube connector. The handle body is used to install a medical catheter. The distal end of the inner tube is connected to the inner tube connector, and the proximal end of the inner tube enters the handle body through the passage hole and is used in conjunction with the medical catheter. an external bending control mechanism, the external bending control mechanism being disposed inside the handle body and being used to control the curvature of the medical catheter; An internal bending control mechanism is also provided inside the handle body and is used to control the curvature of the inner tube.

5. The medical device according to claim 4, wherein: The external control bending mechanism includes: a first rotating part; a first movable part, wherein the first movable part is connected to the first rotating part, and the rotating part is provided with a rotating pair and moves between a first position and a second position through the movable part; An outer tube pull wire, the distal end of which is connected to the movable part, and the proximal end of which extends into the medical catheter and is connected to the proximal end of the medical catheter.

6. The medical device according to claim 4, wherein: The inner control bending mechanism includes at least one set of control components, and the control components include: a second rotating portion, the second rotating portion being rotatably disposed in the handle body; a first elastic member, the first elastic member being connected to the second rotating portion, the rotating portion being provided with a rotating pair and being movable between a third position and a fourth position via the first elastic member; At least one inner tube pull wire, the proximal end of the inner tube pull wire is connected to the elastic member, and the distal end of the inner tube pull wire extends into the inner tube and is connected to the proximal end of the inner tube.

7. The medical device according to claim 5, wherein: The handle further includes an external control bending self-locking mechanism, and the external control bending self-locking mechanism includes: A pressing portion, the pressing portion being provided in the handle body; A third rotating portion is rotatably disposed in the handle body. When the pressing portion is pressed, the third rotating portion can be rotated relative to the handle body and engaged with the first rotating portion.

8. The medical device according to claim 6, wherein: The inner control bending mechanism further includes a wheel baffle, which is arranged in the handle body, and the control component is located on one side and / or both sides of the wheel baffle.

9. The medical device according to claim 8, wherein: The inner control bending mechanism also includes at least two spring leaf positioning plates, adjacent spring leaf positioning plates are spaced apart and fixed to one side and / or both sides of the wheel disc baffle, and a spring leaf sliding groove is formed between the adjacent spring leaf positioning plates to reduce the friction of the first elastic member.

10. The medical device according to claim 9, wherein: The handle further includes an internal control bending self-locking mechanism disposed inside the handle body, and the internal control bending self-locking mechanism includes: a fourth rotating portion, the fourth rotating portion being rotatably disposed in the handle body; Axle seat; A pair of locking plates are rotatably arranged on the shaft seat, and the proximal end of each locking plate is connected to the fourth rotating part. After the fourth rotating part is given a rotating pair, the distal ends of the pair of locking plates can be relatively closed to hold the second rotating part.

11. The medical device according to claim 10, wherein: A second elastic member is provided between the distal ends of the pair of locking pieces. The second elastic member enables the distal ends of the pair of locking pieces to be relatively opened to release the second rotating part.

12. The medical device according to claim 6, wherein: The handle further includes an internal control bending self-locking mechanism disposed outside the handle body, and the internal control bending self-locking mechanism includes: a fixed shaft connected to the second rotating part; a fifth rotating portion, the fifth rotating portion being rotatably disposed on the fixed shaft; A gasket is loosely fitted with the second rotating part and is placed inside the fifth rotating part. When the fifth rotating part is subjected to a rotational pair, the gasket is pressed by the fifth rotating part and radially compresses the second rotating part.

13. The medical device according to claim 6, wherein: The medical catheter further comprises an inner tube locking mechanism disposed outside the handle body, wherein the inner tube locking mechanism limits movement of the inner tube relative to the medical catheter.

14. The medical device according to claim 13, wherein: The inner tube locking mechanism includes: a first fixing portion and a first rotating portion connected to the first fixing portion; The clamping part has a clamping hole for the inner tube to pass through and is arranged between the first fixed part and the first rotating part. When the first rotating part is given a rotating pair, it can rotate relative to the first fixed part and drive the clamping part to achieve radial change of the aperture of the clamping hole.

15. The medical device according to claim 14, wherein: The clamping portion is a single elastic tubular structure, and the clamping hole is penetrated through the tubular structure.

16. The medical device according to claim 14, wherein: The clamping part is an adjustable clamping assembly composed of multiple clamping pieces, and the adjustable clamping assembly is driven by the first rotating part to perform opening and closing movements as a whole.

17. The medical device according to claim 16, wherein: The first rotating part has a first connecting part, and a second connecting part corresponding to the first connecting part is set on one side of each clamping piece. 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.

18. The medical device according to claim 16, wherein: The first fixing portion is provided with a third connecting portion, and a fourth connecting portion is provided on the other side of each clamping piece. When the third connecting portion rotates, the third connecting portion moves along the moving path of the fourth connecting portion.

19. The medical device according to claim 17, wherein: 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.

20. The medical device according to claim 18, wherein: The third connecting portion is a second protrusion provided on the clamping piece, and the fourth connecting portion is a second sliding groove provided on the first rotating portion and corresponding to the second protrusion.

21. The medical device according to claim 16, wherein: The multiple clamping pieces constituting the adjustable clamping assembly are evenly distributed along the circumference, and adjacent clamping pieces are partially tangent and form the same angle, so that there is no gap between each clamping piece during the radial opening and closing movement of the adjustable clamping assembly.

22. The medical device according to claim 13, wherein: The inner tube locking mechanism comprises: A second fixed portion and a second rotating portion hinged to the second fixed portion, wherein the second fixed portion and the other unconnected end of the second rotating portion are connected via a fastening device.

23. The medical device according to claim 13, wherein: The inner tube locking mechanism comprises: a first portion, the first portion being connected to the handle body and having a hole formed therein; The second part covers the movable end of the inner tube and can be engaged with the first part.

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