CN114533209A

CN114533209A - Medical catheter and medical device comprising same

Info

Publication number: CN114533209A
Application number: CN202011346979.XA
Authority: CN
Inventors: 王雄伟; 朱鑫建; 王幸敏
Original assignee: Microport Urocare Jiaxing Co Ltd; Microport Urocare Shanghai Co Ltd
Current assignee: Microport Urocare Jiaxing Co Ltd; Microport Urocare Shanghai Co Ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2022-05-27
Also published as: WO2022111107A1

Abstract

The invention relates to a medical catheter and a medical device comprising the same, wherein the medical catheter comprises an outer tube main body section, an outer tube bending section and an outer tube head section, and further comprises a supporting part and a passage, the supporting part is injected with a medium to a storage cavity through the passage, the supporting part is expanded or the medium is extracted from the storage cavity through the passage, and the supporting part is contracted. The medical device comprises the medical catheter, an inner tube and a handle, wherein the inner tube and the handle are matched with the medical catheter, and the far end of the inner tube enters the handle from a channel of the handle and penetrates into the medical catheter to extend out from the far end of the medical catheter. The medical device has the advantages that the stability of the medical device is enhanced by arranging the supporting part, the medium is filled into the storage cavity in the supporting part by using the passage, the supporting part is expanded and drives the whole section of medical catheter to move and cling to the intestinal wall, the intestinal space is expanded by using the supporting part, so that the distance from the inner tube to the nipple is increased, and the space and the stability are provided for the operation of the inner tube.

Description

Medical catheter and medical device comprising same

Technical Field

The invention relates to the technical field of medical instruments, in particular to a medical catheter and a medical device comprising the same.

Background

[ introduction to the technique of Via-mouth choledochoscope ]

Cholecystoscope (cholecystoscope) and cholecystoscope technology are widely applied clinically, become one of the most important diagnostic tools and treatment methods for liver and biliary tract diseases and special conditions, and become one of the most important minimally invasive technical means for biliary surgery, namely liver surgery. Generally, the choledochoscope technology can be divided into two types, namely artificial channel and natural cavity channel, according to the endoscope advancing path, the former type of artificial channel endoscope advancing path can comprise T-tube sinus, percutaneous transhepatic and intraoperative choledochoscope, and the latter type of natural cavity endoscope advancing path mainly refers to the oral choledochoscope technology.

[ introduction to Primary and secondary biliary tract mirror ]

The choledochoscope is the most classical technique of the oral choledochoscope, and the technique is that firstly, a duodenoscope is used for performing duodenal papillary incision, and then a son scope (the diameter of the oral choledochoscope is about 3.5 mm) is inserted into a common bile duct from an instrument channel of the mother scope, so that examination, tissue biopsy and stone removal treatment of an extrahepatic bile duct can be performed. The technique has the advantages of entering the endoscope along a natural channel, no need of operation, minimal trauma and the like.

The use method of the biliary tract primary-secondary endoscope comprises the following steps:

the body of the mother endoscope (duodenoscope) is inserted through the mouth;

the scope body of the mother endoscope passes through the stomach and then passes through the pylorus to reach the duodenum;

finding the nipple in the descending part of the duodenum, and cutting the nipple with a cutting knife or expanding the opening of the nipple with an expansion balloon;

inserting a sub endoscope body (an oral choledochoscope with the diameter of about 3.5 mm) from an instrument channel inlet of a main endoscope;

the head end of the secondary endoscope extends out of the instrument channel outlet of the primary endoscope, is inserted into the duodenal papilla and enters the bile duct or pancreatic duct;

after the sub-scope finds out the tumor or the calculus, a biopsy forceps or a laser optical fiber is inserted from the instrument channel of the sub-scope for biopsy or laser lithotripsy.

[ problem ] technical problem in the prior art

The choledochoscope can realize the examination and treatment of the cholepancreatic duct under direct vision, is an important minimally invasive operation which can be completed by following a natural channel, and benefits a large number of patients. However, because two sets of mirrors (a secondary mirror and a primary mirror) need to be matched with each other, the technical principle is combined to cause the problem of high operation difficulty, and the specific problems are as follows:

(I) insufficient stability: the distal end of primary mirror hangs near the nipple, because common bile duct axial and the crossing department of duodenum descending part section are the acute angle, the distal end position that the secondary mirror arrived the duodenum descending part must become just can aim at the duodenum nipple after the J type reversal, and the primary mirror distal end does not have the support, influence such as by intestinal peristalsis makes the distal end position of primary mirror easily take place to remove, the head end of the secondary mirror body of taking primary mirror apparatus passageway inside also can shift, and the secondary mirror also can not continue to advance to common bile duct direction because of not having the support, influence operation.

And (II) the illumination is insufficient, the space for arranging the light source at the end of the sub-lens is limited, and the light source close to the sub-lens cannot illuminate the stomach in a larger space, so that the operation of independently using the sub-lens to enter the stomach to search pylorus and the like is difficult.

(III) the operation difficulty is high: the handle for operating the secondary endoscope and the handle for operating the primary endoscope need to be closely matched by two doctors with high qualification, so that the distance between the two handles can be adjusted, and the operation difficulty is extremely high and the operation is complex.

(IV) susceptibility to cross-infection between patients: in order to change the advancing direction of the secondary mirror relative to the primary mirror, the head end of the existing primary mirror is provided with a clamp lifter, and the clamp lifter can provide a baffle effect. However, the structure of the forceps lifter is complex and difficult to sterilize. In order to solve the above problems, a disposable mother endoscope has been designed, but the disposable mother endoscope has a high use cost.

Disclosure of Invention

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

In order to achieve the purpose, the technical scheme of the invention is as follows:

the medical catheter comprises an outer tube main body section, an outer tube bending section and an outer tube head section, wherein the near end of the outer tube head section is connected with the far end of the outer tube bending section, the near section of the outer tube bending section is connected with the far end of the outer tube main body section, the near end of the outer tube main body section is connected with a handle, and the medical catheter further comprises at least one supporting part which is arranged at the far end of the outer tube main body section; the outer tube main body section is also provided with a passage, the far end of the passage is connected with the supporting part, and the near end of the passage is connected with a handle.

Further, the first center of the support portion is not concentric with the second center of the outer tube body section, and the non-concentricity provides the support portion with one or more connection ends that connect with the passageway in the outer tube body section.

Furthermore, an opening is formed in the head section of the outer pipe, and the opening is arranged along the axial direction of the head section of the outer pipe.

The medical device comprises the medical catheter, an inner tube and a handle, wherein the inner tube and the handle are matched with the medical catheter for use, the near end of the medical catheter is connected with the handle, the near end of the inner tube is also connected with the handle, and the far end of the inner tube enters the handle from a channel of the handle and penetrates into the medical catheter to extend out of the far end of the medical catheter.

Further, the handle comprises a handle body, the handle body is provided with a passage hole and an inner tube connecting piece, the handle body is used for installing a medical catheter, the far end of the inner tube is connected with the inner tube connecting piece, and the near end of the inner tube enters the handle body through the passage hole and is matched with the medical catheter for use;

further, the outer pipe bending control mechanism is arranged inside the handle main body and is used for controlling the bending degree of the medical catheter;

furthermore, the inner pipe bending control mechanism is also arranged inside the handle main body and is used for controlling the bending degree of the inner pipe.

Further, the outer tube bending control mechanism comprises: a first rotating section; a first movable portion connected to the first rotating portion, the rotating portion being provided with a revolute pair and being movable between a first position and a second position by the movable portion;

the far end of the outer tube pulling wire is connected with the movable part, and the near end of the outer tube pulling wire extends into the medical catheter and is connected with the near end of the medical catheter.

Further, the inner pipe bending control mechanism comprises at least one set of control components, and the control components comprise:

the second rotating part is rotatably arranged in the handle main body.

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

the near end of the inner tube pull wire is connected with the elastic piece, and the far end of the inner tube pull wire extends into the inner tube and is connected with the near end of the inner tube.

Further, the handle still includes the curved self-locking mechanism of outer management and control, the curved self-locking mechanism of outer management and control includes:

a pressing part provided in the handle body;

the third rotating part is rotatably arranged in the handle main body, and the pressing part can be pressed to enable the third rotating part to rotate relative to the handle main body and be clamped with the first rotating part.

Furthermore, the inner pipe bending control mechanism further comprises a wheel disc baffle, the wheel disc baffle is arranged in the handle body, and the control part is located on one side and/or two sides of the wheel disc baffle.

Furthermore, the inner pipe bending control mechanism further comprises at least two spring piece positioning plates, a distance is reserved between every two adjacent spring piece positioning plates, the adjacent spring piece positioning plates are fixed on one side and/or two sides of the wheel disc baffle, and a spring piece sliding groove used for reducing the friction force of the first elastic piece is formed between the adjacent spring piece positioning plates.

Further, the handle is still including setting up in the curved self-locking mechanism of inner tube accuse inside the handle main part, the curved self-locking mechanism of outer management and control includes:

the fourth rotating part is rotatably arranged in the handle main body;

a shaft seat;

the pair of locking sheets are rotatably arranged on the shaft seat, the near end of each locking sheet is connected with the fourth rotating part, and the fourth rotating part is endowed with a revolute pair to drive the far ends of the pair of locking sheets to be oppositely closed so as to hold the second rotating part tightly.

Further, a second elastic member is disposed between distal ends of the pair of locking tabs, and the second elastic member allows the distal ends of the pair of locking tabs to be relatively spread apart to release the second rotating portion.

Further, the handle is still including setting up in the outside curved self-locking mechanism of inner tube accuse of handle main part, the curved self-locking mechanism of interior management and control includes:

a fixed shaft connected with the second rotating part;

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

a spacer which is in clearance fit with the second rotating part and is arranged on the fifth rotating part

And the gasket is pressed by the fifth rotating part and presses the second rotating part in the radial direction when the fifth rotating part is provided with a revolute pair.

Furthermore, the medical catheter further comprises 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.

The inner tube locking mechanism includes:

the first rotating part is connected with the first fixed part;

the clamping part is provided with a clamping hole for the inner pipe to pass through and is arranged between the first fixing part and the first rotating part, and the first rotating part can rotate relative to the first fixing part when a revolute pair is endowed with the first rotating part and drives the clamping part so as to realize the radial change of the aperture of the clamping hole.

Furthermore, the clamping part is a single and elastic tubular structure, and the clamping hole penetrates through the tubular structure.

Furthermore, the clamping part is an adjustable clamping assembly consisting of a plurality of clamping pieces, and the adjustable clamping assembly is driven by the first rotating part to integrally move in an opening and closing manner.

Furthermore, the first rotating part is provided with a first connecting part, one side of each clamping piece is provided with a second connecting part correspondingly connected with the first connecting part, and 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.

Furthermore, the first fixing part is provided with a third connecting part, the other side of each clamping piece is provided with a fourth connecting part, and when the third connecting part rotates, the third connecting part moves along the moving path of the fourth connecting part.

Furthermore, the first connecting portion is a first sliding groove formed in the first fixing portion, and the second connecting portion is a first protrusion extending along one side of the clamping piece.

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

Furthermore, a plurality of clamping sheets forming the adjustable clamping assembly are uniformly distributed along the circumferential direction, and parts between adjacent clamping sheets are tangent and form the same included angle, so that no gap exists between every two adjacent clamping sheets in the radial opening and closing movement of the adjustable clamping assembly.

Further, the inner tube locking mechanism includes:

the second fixed part and with the articulated second rotating part of second fixed part, connect through fastener between the other end that second fixed part and second rotating part are not connected.

Further, the inner tube locking mechanism includes:

the first part is connected with the handle main body, and a hole is formed in the first part;

and the second part covers the moving end of the inner pipe and can be clamped with the first part.

Compared with the prior art, the invention has the following beneficial technical effects

Stability reinforcing, through set up the supporting part in the distal end of outer tube main part section, it is right to utilize the passageway the inside chamber that piles up of supporting part fills into the medium, makes the supporting part inflation and drive whole section medical catheter and remove and paste the intestinal wall, utilizes the supporting part to strut the intestinal space and make inner tube to papillary distance increase, provides space and stability for the operation of inner tube.

Furthermore, the head section of the outer tube is provided with a light source, the large stomach space is illuminated by utilizing the medical catheter light source and matching with the inner tube light source, and the problem of insufficient illumination of the stomach space is solved under the condition of not increasing the outer diameter of the inner tube.

Furthermore, under the condition that the outer diameter size of the inner tube is not changed, the inner diameter of the first passage is enlarged, the sectional area of the first passage is increased by 1 time, so that the biopsy forceps with the outer diameter of 1.5mm can be used in the first passage, the biting force of the biopsy forceps is increased, the sampling amount is greatly increased, the sampling frequency is reduced, and the application range of the instrument is enlarged.

Furthermore, the second passages used as the mounting circuit and the medium are provided with independently used cavities, so that the medium is introduced into the second passages at a larger flow rate, and the passages are not affected mutually.

Furthermore, the operation difficulty is reduced, the number of the handles is reduced from two original handles to only one handle, a user can operate the handle by one person, the outer pipe bending control mechanism is added in the handle main body, the handle of the forceps lifting device is utilized to drive the rotating disc of the forceps lifting device, the clamp lifting device turntable is endowed with a rotating pair and converts the rotating pair into a moving pair in which a clamp lifting device sliding block moves in a reciprocating manner in a sliding groove of a clamp lifting device sliding plate through a clamp lifting device pull rod, the forceps lifter sliding block drives the near end of the medical catheter to bend through the outer tube pull wire in the moving process, therefore, the proximal end of the medical catheter provides a baffle effect when being bent, the advancing direction of the inner tube matched with the medical catheter is changed, the original direct viewing direction is changed into the side viewing direction in the process of entering the endoscope to the duodenum, and the inner tube can be aligned to the nipple on the side wall of the descending part of the duodenum and continuously enters the common bile duct.

Furthermore, an inner tube bending control mechanism is arranged in the handle, the inner tube bending control mechanism is provided with two sets of control components, each set of control component respectively controls two pull wires, so that the bending section of the inner tube can be bent in two directions, and the near end of the inner tube can be bent in four directions by utilizing the two sets of control components, so that the inner tube can enter the stomach from the esophagus through different bending sections and then enter the duodenum through the pylorus.

Furthermore, in the inner pipe bending control mechanism, in order to avoid friction between the lower wheel disc spring piece and the shell or other parts, the inner pipe bending control mechanism is also provided with lower wheel disc spring piece positioning plates, and lower wheel disc spring piece sliding grooves are formed between the lower wheel disc spring piece positioning plates, so that the spring pieces can slide along the sliding grooves. Meanwhile, a wheel disc baffle is further arranged in the inner pipe bending control mechanism to cover the upper wheel disc spring piece positioning plate, so that unnecessary friction caused by contact of an upper wheel disc pull wire and other parts is avoided.

Furthermore, an outer control bending locking mechanism is arranged in the handle, and the outer control bending self-locking mechanism utilizes the downward movement of the spring pin when being pressed, so that the pin head of the spring pin applies pressure to the limiting rod, the limiting rod rotates along the limiting buckle and contacts the forceps lifting device turntable, the rotation of the forceps lifting device turntable is limited, and the self-locking of the medical catheter at any bending degree is realized.

Furthermore, an inner pipe control bending locking mechanism is further arranged inside the handle, and the inner pipe can be locked in any one direction of the upper direction, the lower direction, the left direction and the right direction relative to the medical catheter by the inner pipe control bending self-locking mechanism. The inner pipe bending control locking mechanism is provided with two structures which are respectively arranged outside or inside the handle main body, wherein one structure utilizes a rotating part to enable the locking sheets of the pressure rod part to do relative rotation motion by taking the shaft as the center, so that the far ends of the adjacent locking sheets are relatively closed and respectively hold the upper wheel disc and the lower wheel disc tightly, and the self-locking of the inner pipe in any direction is realized. The other structure is that the rotatory locking knob drives and rotates the stopper rotatory, rotates the stopper and makes after the face rotates thereby fixed stopper receives and realizes axial displacement at the ascending extrusion force of axial, because the back of fixed stopper sets up first locking gasket, and first locking gasket receives the extrusion and is right along the axial the rim plate exerts pressure soon down, the rim plate knob receives the extrusion force to remove down, is removing the in-process first locking gasket internal diameter reduces gradually and embraces the axle head of rim plate tightly down, makes it unable rotation. And meanwhile, the lower wheel disc knob is extruded and then moves along the axial direction at the shaft end of the lower wheel disc and contacts with the upper wheel disc knob, so that the inner diameter of a second locking gasket at the upper wheel disc knob contracts along the radial direction and holds the shaft end of the upper wheel disc tightly, the upper wheel disc is locked, and the upper wheel disc and the lower wheel disc are locked.

Furthermore, an inner tube locking mechanism is further arranged in the handle, the inner tube locking mechanism adopts a clamping part to apply pressure to the inner tube through the clamping part after the clamping part rotates through the first rotating part, and can also adopt a rotary structure or a sleeve type structure to lock the inner tube, so that the position of the inner tube relative to the medical catheter is fixed, and the clamping and the releasing of the inner tube are realized.

Furthermore, the medical catheter has no cross infection risk, can be used as a disposable product, the manufacturing cost of the medical catheter is greatly lower than that of the traditional structure, the cost of the whole device is low, and only one set of imaging system and one endoscope image processor are matched for use.

Drawings

Fig. 1 is a schematic structural view of a medical catheter and a medical device including the medical catheter according to an embodiment of the present invention.

FIG. 2 is a front view showing the structure of a catheter head section in a medical catheter and a medical device comprising the same according to an embodiment of the present invention

Fig. 3 is a schematic structural view showing a medical catheter and a medical device including the medical catheter according to an embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view illustrating a connection between a main tube segment and a support portion in a medical catheter and a medical device including the medical catheter according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a medical catheter and a medical device including the medical catheter according to an embodiment of the present invention.

Fig. 6 shows a front view of an inner tube of a medical catheter and a medical device incorporating the catheter in accordance with an embodiment of the present invention.

Fig. 7 is a schematic structural view of an inner tube head section of a medical catheter and a medical device including the medical catheter according to an embodiment of the present invention.

Fig. 8 is a partial structural view of an inner tube head section of a medical catheter and a medical device including the medical catheter according to an embodiment of the present invention.

FIG. 9 is a cross-sectional view of an inner tubular body segment of a medical catheter and medical device incorporating the same, in accordance with an embodiment of the present invention.

FIG. 10 is a cross-sectional view of a main body segment of an inner tubing of another embodiment of a medical catheter and a medical device incorporating the catheter according to embodiments of the present invention.

Fig. 11 is a schematic view showing the structure of the outer part of the handle in the medical catheter and the medical device including the medical catheter according to the embodiment of the present invention.

Fig. 12 is a schematic structural view of an outer tube bending mechanism in a medical catheter and a medical device including the medical catheter according to an embodiment of the present invention.

Fig. 13 is a partial schematic structural view i of an inner tube bending mechanism in a medical catheter and a medical device including the same according to an embodiment of the present invention.

Fig. 14 is a partial schematic structural view ii of the inner tube bending mechanism in the medical catheter and the medical device including the medical catheter according to the embodiment of the invention.

Fig. 15 shows a schematic partial structural view iii of an inner tube bending mechanism in a medical catheter and a medical device including the medical catheter according to an embodiment of the invention.

Fig. 16 is a schematic structural view i of a first embodiment of an inner tube bending mechanism in a medical catheter and a medical device including the medical catheter according to an embodiment of the present invention.

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

Fig. 18 is a schematic structural view showing a second embodiment of an inner tube bending mechanism in a medical catheter and a medical device including the same according to an embodiment of the present invention.

Fig. 19 is a schematic structural view showing a first embodiment of an inner tube locking mechanism in a medical catheter and a medical device comprising the medical catheter according to the embodiment of the invention.

Fig. 20 is a schematic structural view I of a medical catheter and a medical device comprising the medical catheter according to the embodiment of the invention, wherein the inner tube locking mechanism is a second embodiment.

FIG. 21 is a second embodiment of a locking mechanism for an inner tube of a medical catheter and a medical device incorporating the catheter, according to an embodiment of the present invention, shown schematically in FIG. II.

Fig. 22 is a schematic structural view iii of a second embodiment of an inner tube locking mechanism in a medical catheter and a medical device comprising the same according to an embodiment of the present invention.

Fig. 23 is a schematic structural view showing a third embodiment of an inner tube locking mechanism in a medical catheter and a medical device comprising the same according to an embodiment of the present invention.

FIG. 24 is a schematic structural view showing a fourth embodiment of an inner tube locking mechanism in a medical catheter and a medical device comprising the same according to an embodiment of the present invention

FIG. 25 is a schematic view of a medical device in accordance with an embodiment of the present invention inserted into a body via the mouth of a medical catheter.

FIG. 26 is a schematic view of a medical device of an embodiment of the present invention showing a medical catheter looking for the pylorus in the stomach.

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

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

Fig. 29 is a schematic view showing the supporting part expanding the inner space of the intestinal tract in the medical device according to the embodiment of the invention.

FIG. 30 shows a schematic view of a bending segment of a tube in a medical device looking for a nipple and inserting a guidewire in accordance with an embodiment of the present invention.

FIG. 31 is a schematic view of the insertion of the tip of the inner tube into the nipple in a medical device according to an embodiment of the present invention.

FIG. 32 is a schematic view of a biopsy forceps extending through an inner tube instrument channel in a medical device according to an embodiment of the invention.

In the drawings, the reference numbers: 1. a handle body;

101. an inner tube locking mechanism; 10100. locking the nut; 101001, an internal threaded hole; 10101. an inner tube locking washer; 101010, a first clamping hole; 10102. a locking seat; 101020, external threads; 10103. a first limit buckle; 10104. a clamping seat; 10105. rotating the disc; 101051, a handle mounting opening; 101052, a first sliding groove; 101053, a through opening of the rotating disc; 10106. an anti-rotation buckle groove; 10107. rotating the handle; 10108, fixing the disc; 101081, a second sliding groove; 101082, a fixed disc through hole; 10109. a clamping piece; 101091, a first protrusion; 101092, a second protrusion; 101093, a second clamping hole; 10110. a clamping end; 10111. a hinge; 10112. a fixed end; 10113. clamping the handle; 10114. a clamping opening; 10115. a sleeve; 10116. pipe sleeve; 10117. a first tooth; 10118. a second tooth.

102. An outer pipe control bending self-locking mechanism; 10201. a spring pin; 10202. a limiting rod; 102021, latch; 10203, a second limit buckle;

103. a left housing; 104. a right housing; 105. lifting a handle of the pincer; 106. a clamp lifting device turntable; 1061. a tooth socket; 107. an upper wheel disc knob; 108. a lower wheel knob; 109. locking the knob; 110. a tee fitting; 111. A balloon valve; 112. a clamp lifter pull rod is buckled; 113. a pulling rod of the forceps lifting device; 114. a slide block is buckled; 115. a clamp lifter sliding block; 116. a sliding plate of the clamp lifting device; 1161. a buckle sliding groove; 1162. a pull wire hole; 117. an inner tube passage; 118. a lower wheel disc flange; 119. a lower wheel disc; 1191. a fixed shaft mounting hole; 120. a fixed shaft; 121. A lower wheel disc spring leaf; 122. a lower wheel disc spring piece positioning plate; 123. a lower wheel disc spring piece sliding groove; 124. Pulling a wire of the lower wheel disc; 125. a pull wire buckle of the lower wheel disc; 126. the upper wheel disc is provided with a flange; 127. an upper wheel disc; 128. An upper rim plate spring leaf; 129. an upper wheel disc spring piece positioning plate; 130. an upper wheel disc spring piece sliding groove; 131. Pulling the wire by the upper wheel disc; 132. an upper wheel disc stay wire buckle; 133. a wheel disc baffle plate; 134. an inner tube connector; 135. An outer tube transition piece; 136. a cover plate of a pull line; 137. a water and gas injection pipe; 138. a suction port; 139. a locknut; 140. rotating the limiting block; 1401. a convex portion; 141. fixing a limiting block; 1411. a first side; 1421. A first locking washer; 1422. a second locking washer; 143. a passage hole; 144. a pressure lever; 145. locking the handle; 146. a shaft seat; 1461. a shaft; 147. a locking sheet; 148. a spring;

2. an inner tube; 201. an inner tubular body section; 2011. a first hole; 2012. a second hole; 2013. a first opening; 2014. a second opening; 2015. a second face; 202. an inner tube curved section; 203. an inner tubular head section; 2031. A third aperture; 2032. a first mounting port; 2033. a fourth aperture; 2034. a second mounting opening; 2035. a camera assembly; 2036. a first light source; 204. a first tube; 2041. a first chamber; 2051. a second tube; 2052. a second chamber; 2053. a third tube; 2054. a third chamber; 206. a fourth tube; 207. a first outer layer; 208. a second outer layer; 209. a fifth aperture;

3. a medical catheter; 301. an outer tube pull wire; 302. an outer tube body section; 3021. a passage; 3022. a lumen; 3023. a second center; 303. a support portion; 3031. a first center; 3032. a reservoir chamber; 304. an outer tube bending section; 305. an outer tube head section; 3051. a second pull wire hole; 3052. a second light source; 3053. an inner pipe mounting hole; 3054. an opening; 306. and a third pull wire hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the medical catheter and the medical device including the same according to the present invention will be described in detail with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.

In order to more clearly describe the structure of the medical catheter and the medical device comprising the medical catheter, the invention defines the terms "distal end" and "proximal end", the terms are special terms in the field of medical instruments, specifically, the term "distal end" refers to the end far away from the operator and entering the human body during the operation, the term "proximal end" refers to the end close to the operator during the operation, taking fig. 5 as an example, the left side of fig. 5 is the proximal end, and the right side of fig. 5 is the distal end.

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

referring to fig. 1 to 5, the medical catheter 3 includes an outer tube main body section 302, an outer tube bending section 304, an outer tube head section 305, a proximal end of the outer tube head section 305 is connected to a distal end of the outer tube bending section 304, a proximal end of the outer tube bending section 304 is connected to a distal end of the outer tube main body section 302, a proximal end of the outer tube main body section 302 is connected to a handle, and the medical catheter further includes

At least one supporting part 303, wherein the supporting part 303 is arranged at the far end of the outer tube main body section 302, and a storage cavity 3032 is arranged inside the supporting part 303;

a passage 3021, the passage 3021 extending through the outer tube body section 302, a distal end of the passage 3021 communicating with the reservoir 3032, and a proximal end of the passage 3021 connected to the handle;

the support 303 is filled with a medium into the reservoir chamber 3032 through the passage 3021, and the support 303 is expanded or withdrawn from the reservoir chamber 3032 through the passage 3021 to contract the support 303, specifically, the support 303 is a balloon in the embodiment of the present invention.

Referring to fig. 11, the tee 110 is installed on the right housing 104 of the handle body 1, and the tee 110 is used for communicating a water path or an air path so as to introduce liquid or gas into the supporting portion 303.

Specifically, with continued reference to fig. 3-5, the first center 3031 of the support portion 303 is not concentric with the second center 3023 of the outer tube main body segment 302. The support 303 is made non-concentric with one or more connection ends to the passage 3021 of the outer tube body section 302, which are sealingly connected to the mouth of the passage 3021, in this embodiment only one connection end, which may be a connection port to communicate with the passage 3021. The decentered supporting part 303 and the outer tube main body section 302 are eccentrically arranged, the eccentric arrangement enables the supporting part 303 to expand and support from one direction only when expanding, the supporting part 303 expands and drives the whole section of medical catheter to move and cling to the intestinal wall, the supporting part 303 is utilized to support the intestinal space so that the distance from the inner tube 2 to the nipple is increased, and space and stability are provided for the operation of the inner tube 2.

Further, with continuing reference to fig. 4 and 5, a third wire hole 306 and a lumen 3022 are formed in the outer tube main body section 302, the lumen 3022 is used for the inner tube 2 to pass through, a second wire hole 3051 is also formed in the outer tube head section 305, and a wire hole is also formed in the outer tube bending section 304 and corresponds to the third wire hole 306 and the second wire hole 3051, so as to allow the outer tube wire 301 to pass through. Referring to fig. 2, an opening 3054 and an inner tube mounting hole 3053 are formed in the outer tube head 305, the opening 3054 is formed along the axial direction of the outer tube head 305, the inner tube mounting hole 3053 and the opening 3054 are communicated with each other, and an angle at which the inner tube 2 can be bent in one direction is made larger by the opening 3054, which is convenient for a user to operate.

Further, with continued reference to fig. 4 and 5, a second light source 3052 is further disposed on the outer tubular head section 305 of the medical catheter 3, wherein the second light source 3052 is preferably an LED or an optical fiber, and the light source can illuminate a large space in the stomach when the inner tube 2 and the medical catheter 3 enter the stomach together. The outer tube bending section 304 and the outer tube main body section 302 are also provided with wire holes through which power supply wires penetrate for connecting LEDs or optical fibers through the wires to provide electric energy for the LEDs or the optical fibers. The specific arrangement form of the wire hole path and the specific structure of the second light source 3052 belong to the known technologies of those skilled in the art, and the detailed description of the present invention is omitted.

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

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

a first passageway for deploying a medical instrument; for passage and movement along a first path of a medical instrument, which in an embodiment of the invention is a biopsy forceps.

And at least one second passage arranged outside the first passage, wherein the second passage is used for configuring a medium and leading in the circuit, and the medium is a liquid medium or a gas medium.

Specifically, above-mentioned inner tube main part section 201 adopts flexible main part pipe, and the crooked section 202 of inner tube adopts the multi-chamber pipe, the compliance of multi-chamber pipe is softer than flexible main part pipe, just the section of multi-chamber pipe with flexible main part pipe is the same. In other embodiments of the present invention, the inner tube curved section 202 may also be formed as a plurality of curved segments interconnected by a plurality of curved segments, the multi-lumen tube or the curved segments being constructed as known in the art.

The first and second passages are both disposed along the axial direction of the inner tubular body section 201. The first and second passageways are both hole and/or tube structures that extend through the inner tubular body section 201.

The specific structure of the first channel is described below:

referring to fig. 9, the first passage is a first hole 2011 axially penetrating through the inner tube main body segment 201, in an embodiment of the present invention, the first hole 2011 is a circular hole, and in other embodiments of the present invention, the first hole 2011 may have any shape other than a circular hole.

Further, referring to fig. 7, in another alternative embodiment of the present invention, the first channel is a first tube 204 penetrating through the inner tube main body section 201, wherein the first tube 204 is embedded in the first hole 2011, a first cavity 2041 is formed inside the first tube 204, in this embodiment, the first hole 2011 is used for installing the first tube 204, and the first cavity 2041 is used for accessing and moving an instrument.

The specific structure of the second channel is described below:

referring to fig. 8 and 9, the second passage provides the inner tubular body section 201 with an open structure having an opening along the outside of the inner tubular body section 201, the opening being radially recessed toward the center of the inner tubular body section 201. Specifically, the two openings in the present embodiment are the first opening 2013 and the second opening 2014, wherein the first opening forms the second surface 2015 on the inner main tube body segment 201.

At least one outer layer structure is wrapped outside the inner tube main body section 201, and in the embodiment of the present invention, the outer layer structure is a first outer layer 207 and a second outer layer 208, wherein the first outer layer 207 is specifically a woven layer, and the second outer layer 208 is specifically a skin layer. The first outer layer 207 covers the outer side of the inner tubular main body section 201, and the second outer layer 208 covers the first outer layer 207. When the outside of the inner tubular body section 201 is covered by the first outer layer 207, the inside of a portion of the first outer layer 207 closes the first opening 2013 and the second opening 2014 to form an enclosed area.

With continued reference to fig. 8, in another alternative embodiment of the present invention, the second passage may also be a third tube 2053 disposed at the first opening 2013 and a second tube 2051 disposed at the second opening 2014, the third tube 2053 having a third cavity 2054 for medium circulation, the second tube 2051 having a second cavity 2052 for disposing the circuit.

The second tube 2051 has one side fitted to the recessed portion of the opening and adapted in shape. Specifically, the second tube 2051 and the third tube 2053 are preferably designed to have an elliptical shape, so that the second cavity 2052 inside the second tube 2051 and the third cavity 2054 in the third tube 2053 also form an elliptical cavity, thereby increasing the gas volume and the liquid flow rate when the second passage is used for introducing gas or liquid.

The first passage and the second passage are independently arranged, so that the second passage into which a circuit, liquid or gas is introduced does not occupy the space of the inner tube main body section 201 where the first passage is formed, and thus the inner diameter of the first passage, i.e., the first hole 2011 or the inner diameter of the first tube 204 can be set to be larger, and under the condition that the outer diameter of the inner tube main body section 201 is not changed, the inner diameter of the first hole 2011 or the inner diameter of the first tube 204 can be enlarged to 1.2 mm-2.8 mm (the passage is only 1.2mm in the original traditional structure), preferably, the diameter of the first hole 2011 is 1.8mm, the area is increased by nearly one time, so that the conventional biopsy forceps with the outer diameter of 1.5mm can be flexibly used, the sampling amount is greatly increased, and the sampling frequency is reduced. And the application range of the apparatus, such as a bracket, a stone-taking basket and the like, is expanded.

Further, referring to fig. 9, at least one second hole 2012 is further formed in the inner tube main body section 201, an inner diameter of the second hole 2012 is smaller than an inner diameter of the first hole 2011, the second hole 2012 is used for passing a pull wire capable of controlling bending of the inner tube bending section 202, in an embodiment of the present invention, the number of the second holes 2012 is four, so that the second holes 2012 correspond to the inner tube bending section 202 of the inner tube 2 and can be controlled by the handle and controlled along the upper, lower, left, and right directions, and specifically, the pull wires in the second hole 2012 are configured as the upper roulette pull wire 131 and the lower roulette pull wire 124. Accordingly, in another embodiment of the present invention, the second hole 2012 can be replaced by a fourth tube 206, and a pull wire is disposed in the tube of the fourth tube 206 to also control the inner tube bending section 202 passing through the handle and along the upper, lower, left and right directions.

Further, referring to fig. 2, the inner tubular head section 203 is provided with a third bore 2031, the third bore 2031 extends through the inner tubular head section 203 and communicates with the second passage, in particular with the second cavity 2052 of the second tube 2051. A fourth bore 2033 extends through the inner head section 203 and is in communication with the first passage, specifically the first cavity 2041 in the first tube 204. The inner tube head section 203 is further provided with a first mounting port 2032 and a second mounting port 2034, respectively, wherein the first mounting port 2032 is used for mounting the image pickup assembly 2035, and the second mounting port 2034 is used for mounting the first light source 2036.

Referring to fig. 10, in another alternative embodiment of the present invention, the second channel is disposed inside the first channel. Specifically, a fifth hole 209 is formed in the inner tube main body segment 201, the first passage is specifically a first tube 204 arranged in the fifth hole 209, the first tube 204 has a first cavity 2041 for introducing medical instruments, the second passage is specifically a second tube 2051 arranged in the fifth hole 209 and a hole inner space except the first tube 204 and the second tube 2051 in the fifth hole 209, wherein the second tube 2051 is used as a second passage for installing circuits/wires, and the hole inner space except the first tube 204 and the second tube 2051 is used as another second passage for conveying liquid or gas media. The inner space of the hole is used as a free cavity, which can improve the space utilization rate of the whole inner tube main body section 201, and the inner diameter of the first tube 204 can be enlarged to 1.8mm under the condition that the whole outer diameter of the inner tube 2 is not enlarged, so as to obtain the same technical effect as the previous embodiment.

The specific structure of the handle is described below:

referring to fig. 11, the handle according to the embodiment of the present invention includes:

the medical catheter comprises a handle body 1, wherein the handle body 1 is provided with a passage hole 143, the distal end of a medical catheter 3 is connected with the handle body 1 through an outer tube transition connecting piece 135, and an inner tube 2 enters the interior of the handle body 1 through the passage hole 143 and enters the medical catheter 3 from the distal end of the medical catheter 3 so as to be matched with the medical catheter 3.

Specifically, referring to fig. 10, the handle body 1 is formed by fixedly connecting a left housing 103 and a right housing 104.

The specific structure of the outer pipe bending control mechanism is described as follows:

referring to fig. 11 and 12, the handle further includes an outer tube bending control mechanism, the outer tube bending control mechanism is disposed inside the handle body 1, and the outer tube bending control mechanism is configured to control bending of the medical catheter 3, specifically, bending of the proximal end of the medical catheter 3.

With continued reference to fig. 11 and 12, the outer tube bending control mechanism includes:

a first rotating section;

a first movable portion connected to a first rotating portion, the rotating portion being provided with a revolute pair and moving between a first position and a second position by the movable portion;

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

The following describes a specific structure of the first rotating portion in the outer tube bending control mechanism:

referring to fig. 16, in particular, the first rotating portion of the handle according to the embodiment of the present invention specifically adopts a forceps-lifting handle 105 and a forceps-lifting turntable 106, wherein the forceps-lifting handle 105 is clamped with and kept coaxial with the forceps-lifting turntable 106.

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

with continued reference to fig. 11, 12 and 16, the first movable portion includes a caliper lifting lever 113, a caliper lifting slider 115 and a caliper lifting slider 116, one end of the caliper lifting lever 113 is connected to the caliper lifting turntable 106 through a caliper lifting lever buckle 112, the other end of the caliper lifting lever 113 is connected to the caliper lifting slider 115 through a slider buckle 114, the caliper lifting slider 115 is installed in a buckle sliding groove 1161 of the caliper lifting slider 116, and the caliper lifting slider 116 is fixedly connected to the right housing 104 through a plurality of fasteners.

Further, referring to fig. 12, a pull wire hole 1162 is formed on one side of the buckle sliding groove 1161, and the pull wire hole 1162 is located at the lower portion of the forceps holder sliding plate 116, so that the outer tube pull wire 301 passes through the pull wire hole 1162 and extends into the medical catheter 3 to be connected with the proximal end of the medical catheter 3.

The structure of the inner pipe bending control mechanism is described as follows:

the inner pipe bending control mechanism is also arranged inside the handle main body 1 and is used for controlling the bending degree of the inner pipe 2. However, as will be appreciated by those skilled in the art, the inner tube bending control mechanism may control bending in only one direction in addition to multiple directions, depending on the environment of use.

The inner pipe bending control mechanism comprises at least one set of control parts, the set of control parts is used for controlling two directions of the near end of the inner pipe 2, and in order to realize the bending degree of the near end of the inner pipe 2 in four directions, namely the upper direction, the lower direction, the left direction and the right direction, the inner pipe bending control mechanism in the handle provided by the embodiment of the invention adopts two sets of control parts. In order to realize that the two sets of control components do not interfere with each other when rotating, the inner pipe bending control mechanism further comprises a wheel disc baffle 133, the wheel disc baffle 133 is fixed in the left shell 103, and the control components are respectively arranged on two sides of the wheel disc baffle 133, specifically on the upper side and the lower side of the wheel disc baffle 133.

The control part includes:

and the second rotating part is rotatably arranged in the handle main body 1.

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

and the near end of the inner tube pull wire is connected with the elastic part, and the far end of the inner tube pull wire extends into the inner tube 2 and is connected with the near end of the inner tube 2.

The specific structure of the first set of control components in the inner pipe bending control mechanism is described as follows:

referring to fig. 13, in particular, the second rotating portion adopts a lower wheel 119 in the handle according to the embodiment of the present invention, and the lower wheel 119 is rotatably disposed on the left housing 103. The first elastic piece is a lower wheel disc spring leaf 121, the center of the lower wheel disc spring leaf 121 is fixedly connected with the lower wheel disc 119 through a fastener, two ends of the lower wheel disc spring leaf 121 are respectively welded with the far end of a lower wheel disc pull wire 124, and the near end of the lower wheel disc pull wire 124 extends into the inner tube 2 and extends to be connected with the near end of the inner tube 2.

Referring to fig. 13, in order to ensure that the lower sheave stay 124 is not bent during the movement, at least one lower sheave stay buckle 125 is further disposed on the left housing 103, and a positioning hole for positioning the lower sheave stay 124 is disposed in the lower sheave stay buckle 125 to allow the lower sheave stay 124 to pass through.

With continued reference to fig. 13, further, the left housing 103 is further provided with an inner tube connecting member 134, the distal end of the inner tube 2 is connected to the inner tube connecting member 134, and the inner tube 2 extends from the inner tube connecting member 134 and enters the passage hole 143 to enter 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 loop, and the extension and retraction of the inner tube head section 203 of the inner tube 2 can be controlled by adjusting the size of the inner tube loop.

With reference to fig. 13, further, a lower wheel disc rib 118 is fixedly connected to the left shell 103 near the lower wheel disc spring leaf 121, the lower wheel disc rib 118 clamps the lower wheel disc spring leaf 121 in a gap between the lower wheel disc rib 118 and the lower wheel disc 119, and the lower wheel disc spring leaf 121 is limited to the inner side of the lower wheel disc rib 118 by the lower wheel disc rib 118, so that the lower wheel disc spring leaf 121 is prevented from being bounced up by mistake.

With continued reference to fig. 13, the inner tube bending control mechanism further includes at least two lower wheel spring plate positioning plates 122, preferably, three lower wheel spring plate positioning plates 122 are provided in the handle according to the embodiment of the present invention, a space is provided between adjacent lower wheel spring plate positioning plates 122 and fixed to the lower surface of the wheel retainer 133, and a lower wheel spring plate sliding groove 123 is formed between adjacent lower wheel spring plate positioning plates 122. The lower wheel spring piece sliding groove 123 can prevent the lower wheel spring piece 121 from rubbing against the left shell 103 and other parts on the left shell 103.

The specific structure of the second set of control members in the inner tube bending control mechanism is described as follows:

the second set of control members is identical to the first set of control members in structure and arrangement, except that the structures are mounted as follows:

referring to fig. 14 and 16, the second rotating portion of the second set of control members is an upper wheel disc 127, the upper wheel disc 127 is sleeved on the axial end of the lower wheel disc 119, and the axial end of the lower wheel disc 119 extends from the axial end of the upper wheel disc 127. The upper wheel disc rib 126, the three upper wheel disc spring piece positioning plates 129 and the plurality of upper wheel disc pull wire buckles 132 are all fixed on the upper surface of the wheel disc baffle 133, the upper wheel disc spring piece 128 is clamped between the upper wheel disc rib 126 and the upper wheel disc 127, two ends of the upper wheel disc spring piece 128 extend into an upper wheel disc spring piece sliding groove 130 between the adjacent upper wheel disc spring piece positioning plates 129 respectively, two ends of the upper wheel disc spring piece 128 are connected with the far end of an upper wheel disc pull wire 131 respectively, and the near end of each upper wheel disc pull wire 131 penetrates through the upper wheel disc pull wire buckle 132 and extends into the inner tube 2 and extends to be connected with the near end of the inner tube 2.

With continued reference to fig. 14, an inner tube channel 117 is further provided inside the left housing 103, an upper end of the inner tube channel 117 communicates with the channel hole 143, and a lower end of the inner tube channel 117 extends into the outer tube transition piece 135.

Referring to fig. 15, the inner pipe bending control mechanism further includes a wire pulling cover plate 136, the wire pulling cover plate 136 is fixedly connected to the upper surface of the wheel disc baffle 133 through a fastener, and the wire pulling cover plate 136 covers the upper wheel disc spring leaf positioning plate 129 on the upper surface of the wheel disc baffle 133, so as to prevent unnecessary friction caused by contact between the upper wheel disc pull wire 131 and other parts, so as to prolong the service life of the upper wheel disc pull wire 131 and prevent abrasion thereof. In addition, the cable cover 136 also has a limiting function, which can limit the upper wheel spring plate 128 to the inner space of the cable cover 136.

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

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

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

the third rotating part is rotatably arranged in the handle main body 1, and when the pressing part is pressed, the third rotating part can rotate relative to the handle main body 1 and is clamped with the first rotating part.

Specifically, referring to fig. 12, the pressing portion is a spring pin 10201, the spring pin 10201 is mounted on an upper portion of the right housing 104, and a pin portion of the spring pin 10201 extends into the right housing 104. The third rotating part is specifically a limiting rod 10202, the second limiting buckle 10203 is fixed on the right housing 104, and the limiting rod 10202 is in clearance fit with the second limiting buckle 10203, so that the limiting rod 10202 can rotate relative to the second limiting buckle 10203.

The outer tube control bending self-locking mechanism 102 is used as follows, the spring pin 10201 moves downwards when being pressed, so that the pin head of the spring pin 10201 presses the limiting rod 10202, the limiting rod 10202 rotates along the second limiting buckle 10203 and contacts the forceps raising rotating disc 106, and the rotation of the forceps raising rotating disc 106 is limited, so that the self-locking of the medical catheter 3 at any bending degree is realized.

Referring to fig. 12, in order to realize the self-locking of the proximal bending portion of the medical catheter 3 at a specific angle, a plurality of latches 102021 are further disposed on the side of the limiting rod 10202 contacting the forceps holder rotating disk 106, and a plurality of tooth sockets 1061 engaged with the latches 102021 are also disposed on the outer side of the forceps holder rotating disk 106 contacting the limiting rod 10202, the distance between each latch 102021 or each tooth socket 1061 may be large or small, and if the distance is large, the proximal bending angle of the medical catheter 3 is switched between large angles, such as 30 °, 60 °, 90 °, and the like. Conversely, if a small distance is provided, the proximal bending angle of the medical catheter 3 can be switched between small angles. E.g., 5 °, 10 °, 15 °, etc.

The tooth socket structures on the forceps raising device rotating disc 106 and the limiting rod 10202 can also be changed according to different use conditions, for example, flexible protrusions can be used for contact, and the invention is not limited to the tooth socket 1061 arranged on the forceps raising device rotating disc 106 or the latch 102021 arranged on the limiting rod 10202, and any structure can be used as long as the structure can realize the clamping connection between the forceps raising device rotating disc 106 and the limiting rod 10202 when in contact, and the invention is not limited thereto.

The specific structure of the first embodiment of the inner pipe bending control self-locking mechanism is described below, and the inner pipe bending control self-locking mechanism is arranged inside the handle body 1 and can lock the inner pipe 2 in any one direction of up, down, left and right.

The structure of the first embodiment of the inner pipe control bending self-locking mechanism comprises:

a fourth rotating part rotatably disposed in the handle body 1. Specifically, referring to fig. 18, the fourth rotating portion includes a pressing rod 144 and a locking handle 145, wherein the locking handle 145 is in threaded connection with an upper end of the pressing rod 144, a lower end of the pressing rod 144 is in threaded connection with a threaded hole formed in an upper portion of the left housing 103, a lower end of the pressing rod 144 is respectively connected with a proximal end of one locking plate 147, two adjacent locking plates 147 are adjacent to each other and connected with the shaft seat 146 through the same shaft 1461, one locking plate 147 is close to an outer side of the lower wheel disc 119, and the other locking plate 147 is close to an outer side of the upper wheel disc 127. A spring 148 is also connected between the pair of locking tabs 147, and the distal ends of the pair of locking tabs 147 on the spring 148 can be spread apart to release the upper disc 127 and the lower disc 119.

Embodiment one the working process of the inner pipe bending control mechanism is as follows:

and when the locking handle 145 is rotated, the locking handle 145 rotates to drive the compression rod 144 to rotate and move downwards in a small amplitude through the threads, and in the action process, the adjacent locking sheets 147 rotate by taking the shaft 1461 as a rotation point, so that the far ends of the adjacent locking sheets 147 are relatively closed and respectively hug the upper wheel disc 127 and the lower wheel disc 119 tightly, and the self-locking of the inner pipe 2 in any direction is realized. And in the non-self-locking state, the distal ends of the adjacent locking sheets 147 can be relatively opened and contact self-locking of the upper wheel disc 127 and the lower wheel disc 119 through the spring 148.

Next, a specific structure of the second embodiment of the inner pipe bending control self-locking mechanism is described, and the inner pipe bending control self-locking mechanism is disposed outside the handle body 1.

Referring to fig. 16 and 17, in the second embodiment, the inner tube bending self-locking mechanism includes a fixing shaft 120, one end of the fixing shaft 120 is connected to a fixing shaft mounting hole 1191 of the lower wheel disc 119, 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.

Referring to fig. 16 and 17, the device further includes a fifth rotating portion, and the fifth rotating portion is rotatably disposed on the fixed shaft 120. Specifically, the fifth rotating portion is composed of a rotating limit block 140 and a fixed limit block 141, the locking knob 109 is connected to the outside of the rotating limit block 140, a protrusion 1401 is disposed on the lower surface of the rotating limit block 140, a first surface 1411 of the fixed limit block 141 opposite to the rotating limit block 140 is formed in a gradually increasing manner from low to high, and the first surface 1411 enables the rotation of the rotating limit block 140 to be converted into the axial movement of the fixed limit block 141. The fixed limiting block 141 and the rotating limiting block 140 are in clearance fit with one end of the fixed shaft 120 respectively, and the end of the fixed shaft 120 is screwed through the locknut 139, so that the rotating limiting block 140 is prevented from being separated from the fixed shaft 120.

The two control components are adopted in the handle of the embodiment of the invention, the two control components are respectively a first locking gasket 1421 and a second locking gasket 1422, wherein the first locking gasket 1421 is arranged in the opening on the back of the fixed limiting block 141, the second locking gasket 1422 is arranged between the upper wheel disc knob 107 and the lower wheel disc knob 108, the second locking gasket 1422 is in clearance fit with the shaft end of the lower wheel disc 119, and the outer diameter of the second locking gasket is larger than the central aperture of the lower wheel disc knob.

Second embodiment the operation of the inner tube bending locking mechanism is as follows:

referring to fig. 16 and 17, the rotation locking knob 109 drives the rotation limiting block 140 to rotate, the rotation limiting block 140 rotates along the first surface 1411, and then the fixed limiting block 141 is subjected to an axial extrusion force, so as to achieve axial movement, because the first locking washer 1421 is disposed on the back surface of the fixed limiting block 141, the first locking washer 1421 is extruded and applies a pressure to the lower wheel disc 108 in the axial direction, the lower wheel disc knob 108 moves under the extrusion force, the first locking washer 1421 is pressed to deform during the movement, and the first locking washer 1421 deforms to increase the damping and hugs the shaft end of the lower wheel disc 119 tightly, so that the first locking washer 1421 cannot rotate. Meanwhile, the lower wheel disc knob 108 moves axially at the shaft end of the lower wheel disc 119 after being pressed and contacts the upper wheel disc knob 107, so that the inner diameter of the second locking washer 1422 at the upper wheel disc knob 107 is contracted radially and clasps the shaft end of the upper wheel disc 127, thereby locking the upper wheel disc 127, and thus locking the bending degree of the upper wheel disc 127 and the lower wheel disc 119.

The inner tube locking mechanism 101 is described below.

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

the inner tube locking mechanism 101 includes a first fixed portion and a first rotating portion rotatably connected to the first fixed portion, the first rotating portion being provided with a revolute pair to rotate relative to the first fixed portion;

the clamping portion is arranged between the first fixing portion and the first rotating portion, the first rotating portion rotates to apply pressure to the clamping portion, and the clamping portion is applied pressure and extrudes the inner pipe along the radial direction.

Specifically, please refer to fig. 19, the first fixing portion is a locking seat 10102, the first rotating portion is a locking nut 10100, one end of the locking seat 10102 has an external thread 101020, the locking nut 10100 has an internal thread hole 101001 capable of being connected with the external thread 101020, the internal thread hole 101001 runs through the locking nut 10100, a through hole for the inner tube to run through is also formed in 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 be matched with the aperture of the internal thread hole 101001, the material of the inner tube locking gasket 10101 is not limited to silica gel, rubber and the like, and a first clamping hole 101010 capable of allowing the inner tube 2 to pass through is also formed in the inner tube locking gasket 10101.

Embodiment one the specific working process of the inner tube locking mechanism 101 is as follows:

on the external screw thread 101020 of lock nut 10100 forward screw in locking seat 10102, lock nut 10100 extrudees inner tube locking gasket 10101 at the screw in-process gradually, makes the aperture of the first clamp hole 101010 of inner tube locking gasket 10101 reduce gradually in order to hold tightly the external diameter of inner tube 2 to realize the locking of inner tube 2. Conversely, when the lock nut 10100 is rotated in the reverse direction, the inner tube lock washer 10101 is not pressed any more and the restoration of the through hole diameter in the inner tube lock washer 101101 is achieved, thereby releasing the inner tube 2 so that the inner tube 2 can move relative to the medical catheter 3.

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

referring to fig. 20 to 22, the clamp includes a clamping seat 10104 and a clamping portion, a rotating disc 10105 and a fixed disc 10108 are disposed in the clamping seat 10104, the clamping portion is an adjustable clamping assembly formed by a plurality of clamping pieces 10109, a second clamping hole 101093 is formed between each clamping piece 10109, and the adjustable clamping assembly is driven to open and close by the rotation of the rotating disc 10105, so that the diameter of the second clamping hole 101093 is changed in the radial direction.

Wherein, have first connecting portion on the rolling disc 10105, this first connecting portion is for offering the first sliding tray 101052 on rolling disc 10105, one side setting of every clamping piece 10109 with first connecting portion corresponds the second connecting portion of being connected, the second connecting portion specifically be along clamping piece 10109 convex first arch 101091 in one side.

When the rotating disc 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.

With continued reference to fig. 20 to 22, the fixed tray 10108 is provided with a third connecting portion, the third connecting portion is a second sliding groove 101081 opened on the fixed tray 10108, the other side of the clamping piece 10109 is provided with a second protrusion 101092 connected with the second sliding groove 101081, and the second protrusion 101092 on the clamping piece 10109 moves along the second sliding groove 101081 when rotating.

The clamping pieces 10109 forming the adjustable clamping assembly are uniformly distributed along the circumferential direction, and parts of the adjacent clamping pieces 10109 are tangent to form the same included angle, so that no gap exists between each clamping piece 10109 in the radial opening and closing movement of the adjustable clamping assembly.

A handle mounting opening 101051 is formed in the rotating disc 10105 for inserting the rotating handle 10107, a rotating disc through opening 101053 is formed in the axis of the fixed disc 10108, a fixed disc through opening 101082 is formed in the axis of the rotating disc, and the rotating disc through opening 101053 and the fixed disc through opening 101082 are used for passing the inner tube 2. The clamping seat 10104 is sleeved on the outer side of the rotating disc 10105, a first limiting buckle 10103 extending along the radial direction is arranged on the clamping seat 10104, and at least one anti-rotation buckle groove 10106 is formed in the outer side of the rotating disc 10105 and used for being clamped with the first limiting buckle 10103 to limit the rotation of the rotating disc 10105.

Embodiment three the specific structure of the inner tube locking mechanism 101 is as follows:

the inner tube locking mechanism 101 includes a second fixed portion and a second rotating portion hinged to the second fixed portion, and the second fixed portion is connected to the other end of the second rotating portion, which is not connected to the second rotating portion, through a fastening device.

Referring to fig. 23, specifically, the second fixing portion is a fixing end 10112, the second rotating portion is a clamping end 10110, semicircular clamping openings 10114 for matching the outer diameter of the inner tube 2 are respectively formed in the fixing end 10112 and the clamping end 10110, one end of the fixing end 10112 is hinged to one end of the clamping end 10110 through a hinge 10111, and the other end of the fixing end 10112 and the other end of the clamping end 10110 are respectively provided with a threaded hole. The fastening device is a clamping handle 10113 with screw threads, and the clamping end 10110 presses against the fixed end 10112 and clasps the inner tube 2 by rotating the clamping handle 10113 to connect the clamping end 10110 and the end of the fixed end 10112 with the screw threads.

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

referring to fig. 24, a first portion, which is connected to the handle body 1 and has a hole.

The second portion, the second portion cover in the removal end of inner tube and can with first portion passes through protruding structure butt or passes through tooth's socket structure joint.

Specifically, referring to fig. 24, the first portion is a pipe sleeve 10116, the pipe sleeve 10116 is disposed on the handle body 1, and a hole for the inner pipe 2 to extend into is formed in the pipe sleeve 10116.

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

Specifically, the protruding structure refers to at least one protruding point disposed on an inner wall of the hole and at least another protruding point disposed on an outer side of the sleeve 10115, the protruding points are flexible structures, and the sleeve 10115 is matched with the hole on the sleeve 10116, so that the protruding point on the inner wall of the hole is abutted against the another protruding point on the outer side of the sleeve 10115, and friction between the sleeve 10115 and the sleeve 10116 is increased to fix the inner tube 2.

Specifically, the tooth space structure refers to at least one second tooth 10118 disposed on the outer side of the sleeve 10115 and at least one groove disposed on the inner wall of the bore of the sleeve 10116, or may also be at least one first tooth 10117 disposed on the inner wall of the bore of the sleeve 10116 and at least one groove disposed on the outer side of the sleeve 10115, and the tooth space structure may also increase the friction force between the sleeve 10115 and the sleeve 10116 to fix the inner pipe 2.

The specific use of the medical device is described below:

the first step is as follows: referring to fig. 25, the head end of the inner tube 2 is passed through the inner tube locking mechanism 101 and enters the inner tube channel 117 from the channel hole 143, and the inner tube 2 is slowly pushed until entering the medical catheter 3 and extending 4-5 cm from the distal end of the medical catheter 3 (in this state, the inner tube bending section 202 of the inner tube 2 is fully extended).

Referring to the first embodiment of the inner tube locking mechanism 101, the inner tube locking washer 10101 is pressed by rotating the locking nut 10100 on the locking seat 10102, and further the first clamping holes 101010 radially clamp the inner tube 2, so that the relative position of the inner tube 2 with respect to the medical catheter 3 is fixed. The image pickup assembly 2035 and the first light source 2036 on the inner tube 2 and the second light source 3052 on the medical catheter 3 are turned on for illumination and image pickup, and the user holds the handle with the left hand, and the tube body part of the medical catheter 3 with the right hand is about 20-30 cm away from the outer tube head 305 of the medical catheter 3, so that the medical catheter 3 is inserted from the mouth of the patient.

The second step is that: referring to fig. 26 and 27, during the process of pushing the medical catheter 3 by the right hand, the left hand is continuously used to rotate the upper wheel 127 and the lower wheel 119 to control the bending degree of the inner tube 2, which comprises the following steps:

referring to fig. 13 to 15, taking one of the control components as an example, the upper wheel knob 107 is rotated, the upper wheel knob 107 drives the upper wheel 127 to rotate, so as to control the upper wheel spring piece 128 to move in the upper wheel spring piece sliding slot 130, the upper wheel spring piece 128 further drives the upper wheel pull wire 131 to move, because the upper wheel pull wire 131 penetrates through the first cavity 2041 of the first tube 204 in the inner tube main body section 201 of the inner tube 2 and is connected with the inner tube bending section 202, when the upper wheel pull wire 131 moves, the inner tube bending section 202 is driven to move to control the inner tube bending section 202 to bend, and the image fed back by the camera module 5 passes through the esophagus into the stomach, and then passes through the pylorus into the duodenum after the stomach space is illuminated by the first light source 2036 and the second light source 3052.

The third step: referring to fig. 11 and 28, gas or liquid is injected into the passage 3021 of the medical catheter 3 through the tube from the balloon valve 111 at the tail of the handle using a syringe, and the gas or liquid passes through the passage 3021 and enters the reservoir chamber 3032 of the support 303 to inflate the support 303, and the space inside the duodenum is then inflated by the support 303. In other embodiments of the present invention, the water and gas injection pipe 137 may be connected to the passage 3021 through a pipe to supply gas or liquid into the reservoir 3032 of the support 303 through the passage 3021.

The fourth step: referring to fig. 29, the left hand operates the handle to perform the medical catheter control bending, which includes the following specific processes:

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

referring to fig. 11 and 12, a user operates the forceps-lifting handle 105, the forceps-lifting handle 105 drives the forceps-lifting turntable 106 to rotate, the forceps-lifting turntable 106 is provided with a revolute pair, the revolute pair is converted into a moving pair in which the forceps-lifting slider 115 reciprocates in the buckle sliding groove 1161 of the forceps-lifting sliding plate 116 through the forceps-lifting pull rod 113, the forceps-lifting slider 115 drives the proximal end of the medical catheter 3 to bend through the outer tube pull wire 301 during moving, so that the proximal end of the medical catheter 3 provides a baffle effect during bending, thereby changing the advancing direction of the inner tube 2 matched with the medical catheter 3, changing the original direct viewing direction into a side viewing direction during viewing the duodenum, and enabling the inner tube 2 to be aligned with the nipple on the side wall of the duodenum descending part and continue entering in the direction of the common bile duct. The inner tube 2 is withdrawn by the control member into alignment with the outer tube head 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.

When the bending of the outer tube bending section 304 of the medical catheter 3 is raised by 90 °, the inner tube 2 is located in the medical catheter 3, so that the inner tube 2 is also bent by about 90 ° along with the medical catheter 3, please refer to fig. 29, the view direction of the inner tube head section 203 of the inner tube 2 is changed from the same direction as the medical catheter 3 to be perpendicular to the medical catheter 3, and a side-view observation effect is formed. The user continues to slowly insert the medical catheter 3 with his right hand until the nipple formation on the sidewall of the twelve long descending segments is found.

Referring to fig. 31, the inner tube locking mechanism 101 is released, so that the inner tube 1 can go further and the bending angle of the bent section 202 of the inner tube in the inner tube 2 is controlled by the inner tube bending control mechanism, so that the nipple appears in the visual field of the head section 203 of the inner tube in the inner tube 2. The guide wire is inserted from the instrument channel of the handle and sequentially passes through the first lumen 2041 of the inner tube main body section 201 of the inner tube 2 and extends out of the fourth bore 2033 through the inner tube curved section 202, and the guide wire is viewed on the image returned by the camera assembly 2035 to enter the bile duct or pancreatic duct.

If the nipple opening is small, a cutting knife or a nipple expansion balloon can be inserted along the guide wire to perform the nipple opening expansion work. The stone or suspected tumor protrusion is gradually sought by advancing the inner tube head section 203 of the inner tube 2 deeper.

The fifth step: after the calculus is found, the guide wire is pulled out, and then the optical fiber or the electrode is inserted into the first passage of the inner tube 2, specifically, the optical fiber or the electrode sequentially passes through the inner tube bending section 202 from the first cavity 2041 in the first tube 204 of the inner tube 2 and extends out of the fourth hole 2033 for laser lithotripsy or liquid-electricity lithotripsy.

With continued reference to FIG. 32, upon detection of a suspicious tumor protrusion, the guidewire may be withdrawn, a biopsy forceps inserted, and a biopsy performed sequentially from the first lumen 2041 in the first tube 204 of the inner tube 2, through the curved portion 202 of the inner tube, and out the fourth aperture 2033.

After the operation, the gas or liquid in the lumen 3032 in the support portion 303 is sucked out through the suction port 138 by the syringe, and then the inner tube 2 and the medical catheter 3 are pulled out together from the human body.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. Medical catheter, including outer tube main part section, outer tube bending section and outer tube head section, the near-end of outer tube head section with the distal end of outer tube bending section is connected, the nearly section of outer tube bending section with the distal end of outer tube main part section is connected, the near-end and the handle of outer tube main part section are connected, its characterized in that: the support part is at least one and is arranged at the far end of the outer tube main body section; the outer tube main body section is also provided with a passage, the far end of the passage is connected with the supporting part, and the near end of the passage is connected with a handle.

2. The medical catheter of claim 1, wherein: the first center of the support portion is not concentric with the second center of the outer tube body section, the non-concentricity providing the support portion with one or more connection ends connected to the passageway in the outer tube body section.

3. The medical catheter of claim 2, wherein: and an opening is formed in the outer pipe head section and is arranged along the axial direction of the outer pipe head section.

4. A medical device, characterized by: the medical catheter comprises the medical catheter as claimed in any one of claims 1 to 3, and an inner tube and a handle which are matched with the medical catheter for use, wherein the proximal end of the medical catheter is connected with the handle, the proximal end of the inner tube is also connected with the handle, and the distal end of the inner tube enters the handle from a channel of the handle and penetrates into the medical catheter to extend out of the distal end of the medical catheter.

5. The medical device of claim 4, wherein: the handle comprises a handle body, the handle body is provided with a passage hole and an inner tube connecting piece, the handle body is used for installing a medical catheter, the far end of the inner tube is connected with the inner tube connecting piece, and the near end of the inner tube enters the handle body through the passage hole and is matched with the medical catheter for use;

the outer pipe bending control mechanism is arranged inside the handle main body and is used for controlling the bending degree of the medical catheter;

the inner pipe bending control mechanism is also arranged in the handle main body and is used for controlling the bending degree of the inner pipe.

6. The medical device of claim 5, wherein: the outer tube bending control mechanism comprises: a first rotating section; a first movable portion connected to the first rotating portion, the rotating portion being provided with a revolute pair and being movable between a first position and a second position by the movable portion;

7. The medical device of claim 5, wherein: the curved mechanism of inner tube accuse includes at least one set of control unit, control unit includes:

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

A first elastic member connected to the second rotating portion, the rotating portion being provided with a revolute pair and being movable between a third position and a fourth position by the first elastic member;

8. The medical device of claim 6, wherein: the handle still includes the curved self-locking mechanism of outer management and control, the curved self-locking mechanism of outer management and control includes:

a pressing part provided in the handle body;

9. The medical device of claim 7, wherein: the inner pipe bending control mechanism further comprises a wheel disc baffle, the wheel disc baffle is arranged in the handle body, and the control part is located on one side and/or two sides of the wheel disc baffle.

10. The medical device of claim 9, wherein: the inner pipe bending control mechanism further comprises at least two spring piece positioning plates, a distance is reserved between every two adjacent spring piece positioning plates and the two spring piece positioning plates are fixed on one side and/or two sides of the wheel disc baffle, and spring piece sliding grooves used for reducing friction force of the first elastic pieces are formed between every two adjacent spring piece positioning plates.

11. The medical device of claim 10, wherein: the handle is still including setting up in the curved self-locking mechanism of inner tube accuse inside the handle main part, the curved self-locking mechanism of outer management and control includes:

the fourth rotating part is rotatably arranged in the handle main body;

a shaft seat;

12. The medical device of claim 11, wherein: and a second elastic piece is arranged between the far ends of the pair of locking sheets, and the second elastic piece enables the far ends of the pair of locking sheets to be relatively opened so as to release the second rotating part.

13. The medical device of claim 7, wherein: the handle is still including setting up in the outside curved self-locking mechanism of inner tube accuse of handle main part, the curved self-locking mechanism of inner tube accuse includes:

a fixed shaft connected with the second rotating part;

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

a spacer that is gap-fitted to the second rotating portion and is placed inside the fifth rotating portion, the spacer being pressed by the fifth rotating portion and pressing the second rotating portion in a radial direction when a revolute pair is applied to the fifth rotating portion.

14. The medical device of claim 7, wherein: the medical catheter also comprises 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.

15. The medical device of claim 14, wherein: the inner tube locking mechanism includes: the first rotating part is connected with the first fixed part;

the clamping part is provided with a clamping hole for the inner pipe to pass through and is arranged between the first fixing part and the first rotating part, and the first rotating part can rotate relative to the first fixing part and drive the clamping part when a revolute pair is endowed, so that the radial change of the aperture of the clamping hole is realized.

16. The medical device of claim 14, wherein: the clamping part is a single elastic tubular structure, and the clamping hole penetrates through the tubular structure.

17. The medical device of claim 14, wherein: the clamping part is an adjustable clamping assembly consisting of a plurality of clamping pieces, and the adjustable clamping assembly is driven by the first rotating part to integrally perform opening and closing movement.

18. The medical device of claim 17, wherein: the first rotating part is provided with a first connecting part, one side of each clamping piece is provided with a second connecting part correspondingly connected with the first connecting part, and 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.

19. The medical device of claim 17, wherein: the first fixing part is provided with a third connecting part, the other side of each clamping piece is provided with a fourth connecting part, and when the third connecting part rotates, the third connecting part moves along the moving path of the fourth connecting part.

20. The medical device of claim 18, wherein: the first connecting portion is a first sliding groove arranged on the first fixing portion, and the second connecting portion is a first protrusion extending along one side of the clamping piece.

21. The medical device of claim 19, wherein: the third connecting part is a second protrusion arranged on the clamping piece, and the fourth connecting part is a second sliding groove arranged on the first rotating part and corresponding to the second protrusion.

22. The medical device of claim 17, wherein: a plurality of clamping pieces forming the adjustable clamping assembly are uniformly distributed along the circumferential direction, and parts between adjacent clamping pieces are tangent and form the same included angle, so that no gap exists between every two clamping pieces in the radial opening and closing movement of the adjustable clamping assembly.

23. The medical device of claim 14, wherein: the inner tube locking mechanism includes:

the second fixed part and with second fixed part articulated second rotating part, connect through fastener between the second fixed part and the second rotating part other end that does not connect.

24. The medical device of claim 14, wherein: the inner tube locking mechanism includes: