Medical catheter and medical device

Abstract

The present invention relates to a medical catheter and a medical device. The medical catheter includes a first main body section, a first bending section and a first head section. The first main body section has a first passage, at least one second passage and at least one third passage. The first passage is used for a medical instrument to penetrate in and out. The second passage is used for the circulation of a medium or the introduction of an electric circuit. The third passage is used for the arrangement of a traction wire. The medical device includes the above-mentioned medical catheter, an outer tube and a handle that are used in cooperation with the medical catheter. Without changing the outer diameter dimension of the first main body section, the inner diameter of the first passage is enlarged, and the cross-sectional area of the first passage is increased by 1 time, so that a biopsy forceps with an outer diameter of 1.5 mm can be used in the first passage, thereby increasing the biting force of the biopsy forceps and realizing a substantial increase in the sampling amount, reducing the number of samplings, and expanding the use range of the instrument.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to medical catheters and medical devices. Background Art

[0002] Cholangioscopy and cholangioscopy techniques are widely used in clinical practice and have become one of the most important diagnostic tools and treatment methods for intrahepatic and extrahepatic biliary diseases and special cases. They have also become one of the most important minimally invasive technical means in biliary surgery and hepatobiliary surgery. Generally, cholangioscopy techniques can be divided into two categories according to the entry path of the endoscope: through artificial channels and through natural cavities. The former entry path through artificial channels can include T-tube sinus tracts, percutaneous transhepatic, and intraoperative cholangioscopy, etc. The latter entry path through natural cavities mainly refers to peroral cholangioscopy techniques.

[0003] The mother-daughter cholangioscope is the most classic peroral cholangioscopy technique. In this technique, first, a mother endoscope (duodenoscope) is used to perform a duodenal papillotomy, and then a daughter endoscope (a peroral cholangioscope with a diameter of about 3.5 mm) is inserted into the common bile duct through the instrument channel of the mother endoscope, and then the extrahepatic bile duct can be examined, tissue biopsied, and stone removed. The advantages of this technique are that it enters the body through a natural channel, does not require open surgery, and has the least trauma, etc.

[0004] The above-mentioned mother-daughter cholangioscope can achieve the examination and treatment of the bile and pancreatic ducts under direct vision, and it is an important minimally invasive surgery that can be completed following a natural channel, benefiting a large number of patients. However, because it requires the mutual cooperation between two sets of endoscopes (daughter endoscope and mother endoscope), the following problems are brought in terms of its combined technical principle:

[0005] The instrument channel of the daughter endoscope is too small: Currently, the inner diameter of the instrument channel inside the daughter endoscope is only 1.2 mm, and it can only be adapted to a special biopsy forceps. Since the biopsy forceps has weak biting force and a small sampling amount, it often requires several to more than a dozen samplings for a biopsy of one lesion, which not only affects the diagnostic accuracy but also seriously prolongs the operation time.

[0006] Insufficient stability: The distal end of the mother endoscope is suspended near the papilla. Since the intersection of the axial direction of the common bile duct and the descending part of the duodenum forms an acute angle, the daughter endoscope must be reversed in a J shape to align with the duodenal papilla when it reaches the descending part of the duodenum. However, the distal end of the mother endoscope does not have support, and affected by intestinal peristalsis, etc., the position of the distal end of the mother endoscope is likely to move, which will also cause the head end of the daughter endoscope body inside the instrument channel of the mother endoscope to shift. Moreover, the daughter endoscope cannot continue to advance towards the common bile duct direction because it does not have support, affecting the operation.

[0007] Insufficient illumination: The space for arranging the light source at the head end of the daughter endoscope is limited, and the light source close to the daughter endoscope cannot illuminate a large space in the stomach, making it difficult to independently use the daughter endoscope to enter the stomach to find the pylorus and other operations. Summary of the Invention

[0008] In view of the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a medical catheter and a medical device to solve one or more problems in the prior art.

[0009] To achieve the above object, the technical solution of the present invention is as follows:

[0010] A medical catheter, comprising a first main body section, a first bending section and a first head section, the distal end of the first main body section is connected to the proximal end of the first bending section, the distal end of the first bending section is connected to the proximal end of the first head section, the first main body section has at least one first passage, and the first passage is used for a medical device to penetrate in and out.

[0011] Furthermore, the medical catheter further comprises at least one second passage and at least one third passage, the second passage is used for circulating a medium or introducing an electric circuit, and the third passage is used for arranging a traction wire.

[0012] Furthermore, the first passage of the first main body section is separated from the second passage, and the first passage is arranged inside the second passage.

[0013] Furthermore, the second passage makes the first main body section have an opening, and the opening is arranged along the outer side of the first main body section.

[0014] Furthermore, the opening is arranged along the axial direction of the first main body section.

[0015] Furthermore, the opening is recessed radially towards the center of the first main body section.

[0016] Furthermore, at least one outer layer structure covers the outer side of the first main body section.

[0017] Furthermore, the first passage and the second passage are coaxially arranged.

[0018] Furthermore, the first passage and the second passage are non-coaxially arranged.

[0019] Furthermore, when the outer diameter of the first main body section remains unchanged, the inner diameter of the first passage is enlarged to not more than 1.2 - 2.8 mm.

[0020] A medical device, comprising the medical catheter according to any one of claims 1 to 10, an outer tube and a handle used in cooperation with the medical catheter, the proximal end of the outer tube is arranged inside the handle, the distal end of the outer tube extends out of the handle, the proximal end of the medical catheter is movably connected to the handle, and the distal end of the medical catheter extends into the handle and penetrates through the outer tube.

[0021] Compared with the prior art, the beneficial technical effects of the present invention are as follows

[0022] Without changing the outer diameter of the inner tube, the inner diameter of the first passage is enlarged to no more than 1.8 mm, and the cross-sectional area of ​​the first passage is increased by 1 time, so that a biopsy forceps with an outer diameter of 1.5 mm can be used in the first passage, thereby increasing the bite force of the biopsy forceps and achieving a significant increase in the sampling volume, reducing the number of sampling times, and expanding the scope of use of the instrument.

[0023] Furthermore, the second passage for installing the circuit and the medium has an independent cavity, so that the flow rate of the medium is larger and the passages are not affected by each other.

[0024] Furthermore, stability is enhanced by providing a support portion at the distal end of the second main body segment, and using a passage to fill a storage cavity inside the support portion with a medium, so that the support portion expands and drives the entire outer tube to move and adhere to the intestinal wall. The support portion is used to expand the intestinal space so that the distance from the inner tube to the nipple is increased, thereby providing space and stability for the operation of the inner tube.

[0025] Furthermore, a light source is arranged at the head section of the outer tube, and the outer tube light source is used in cooperation with the inner tube light source to illuminate a large space of the stomach, thereby overcoming the problem of insufficient illumination of the stomach space without increasing the outer diameter of the inner tube.

[0026] Furthermore, the difficulty of operation is reduced, and the handle is reduced from the original two handles to only one handle, so the user can operate it alone. By adding an external control bending mechanism in the handle body, the handle of the forceps lifter is used to drive the turntable of the forceps lifter, and the turntable of the forceps lifter is given a rotating pair and the rotating pair is converted into a moving pair through the forceps lifter pull rod. The slider of the forceps lifter moves back and forth in the sliding groove of the sliding groove of the slider of the forceps lifter. During the movement, the proximal end of the outer tube is driven to bend by the outer tube pull wire, so that the proximal end of the outer tube provides a baffle effect when bending, thereby changing the forward direction of the inner tube cooperating with the outer tube, and changing the original straight viewing direction to the side viewing direction during the process of inserting the endoscope into the duodenum, so that the inner tube can be aligned with the nipple on the side wall of the descending part of the duodenum and continue to enter in the direction of the common bile duct.

[0027] Furthermore, an internal control bending mechanism is provided inside the handle, and the internal control bending mechanism has two sets of control components, and each set of control components respectively controls two pull wires to enable the first bending section of the inner tube to be bent in two directions, and then the two sets of control components are used to realize the bending of the proximal end of the inner tube in four directions, so that the inner tube can enter the stomach from the esophagus through different bending sections, and then enter the duodenum through the pylorus.

[0028] Furthermore, in order to prevent the lower disc spring piece from rubbing against the housing or other components in the inner control bending mechanism, a lower disc spring piece positioning plate is also provided in the inner control bending mechanism. A lower disc spring piece sliding groove is formed between the lower disc spring piece positioning plates, allowing the spring piece to slide along the sliding groove. At the same time, a disc baffle is also provided in the inner control bending mechanism to cover the upper disc spring piece positioning plate, preventing the upper disc pulling wire from contacting other components and causing unnecessary friction.

[0029] Furthermore, an outer control bending locking mechanism is provided inside the handle. When the spring pin is pressed, the outer control bending self-locking mechanism moves downward, causing the pin head of the spring pin to press against the limiting rod, causing the limiting rod to rotate along the limiting buckle and contact the lifting pliers turntable, thereby restricting the rotation of the lifting pliers turntable to achieve self-locking of the outer tube at any bending angle.

[0030] Furthermore, an inner control bending locking mechanism is also provided inside the handle. The inner control bending self-locking mechanism can be used to lock the inner tube relative to the outer tube in any direction of up, down, left, or right. This inner control bending locking mechanism has two structures, which are respectively arranged outside or inside the handle body. One structure is to use the rotating part to make the locking piece of the pressing rod part rotate relative to the axis, so that the distal ends of adjacent locking pieces close relative to each other and respectively hold the upper disc and the lower disc, thereby achieving self-locking of the inner tube in any direction. The other structure is to rotate the locking knob to drive the rotating limiting block to rotate. After the rotating limiting block rotates along the surface, the fixed limiting block is subjected to an axial extrusion force and thus moves axially. Since a first locking gasket is provided on the back of the fixed limiting block, the first locking gasket is squeezed and presses against the lower disc along the axis. The lower disc knob moves under the extrusion force. During the movement, the inner diameter of the first locking gasket gradually shrinks and holds the shaft end of the lower disc, making it unable to rotate. At the same time, after the lower disc knob is squeezed, it moves axially at the shaft end of the lower disc and contacts the upper disc knob, causing the inner diameter of the second locking gasket at the upper disc knob to contract radially and hold the shaft end of the upper disc, thereby locking the upper disc, and thus achieving the locking of the upper disc and the lower disc.

[0031] Furthermore, an inner tube locking mechanism is also provided in the handle. The inner tube locking mechanism uses the clamping part to rotate through the first rotating part and then presses against the inner tube, or can also use a rotary structure or a sleeve structure to lock the inner tube, so as to fix the position of the inner tube relative to the outer tube to achieve the clamping and relaxation of the inner tube.

[0032] Furthermore, there is no risk of cross-infection. The product of the present invention can be used as a disposable product. The manufacturing cost of the outer tube is much lower than that of the traditional structure, and the cost of the entire device is low. Only a set of imaging systems and one endoscope image processor need to be used in supporting. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Shows the front view of the medical catheter in the medical catheter and medical device according to the embodiment of the present invention.

[0034] Figure 2 Shows the schematic structural diagram of the first head section of the medical catheter in the medical catheter and medical device according to the embodiment of the present invention.

[0035] Figure 3 Shows the schematic partial structural diagram of the first head section of the medical catheter in the medical catheter and medical device according to the embodiment of the present invention.

[0036] Figure 4 Shows the cross-sectional view of the first main body section of the medical catheter in the medical catheter and medical device according to the embodiment of the present invention.

[0037] Figure 5 Shows the cross-sectional view of the first main body section of the medical catheter in the medical catheter and medical device according to another embodiment of the present invention.

[0038] Figure 6 Shows the schematic structural diagram of the support part provided on the outer tube in the medical catheter and medical device according to the embodiment of the present invention.

[0039] Figure 7 Shows the schematic cross-sectional view of the connection between the second main body section and the support part in the medical catheter and medical device according to the embodiment of the present invention.

[0040] Figure 8 Shows the front view of the structure of the outer tube head section in the medical catheter and medical device according to the embodiment of the present invention.

[0041] Figure 9 Shows the schematic structural diagram of the medical device in the medical catheter and medical device according to the embodiment of the present invention.

[0042] Figure 10 Shows the schematic structural diagram of the outside of the handle in the medical catheter and medical device according to the embodiment of the present invention.

[0043] Figure 11 Shows the schematic structural diagram of the outer tube bending mechanism in the medical catheter and medical device according to the embodiment of the present invention.

[0044] Figure 12 Shows the schematic partial structure of the inner tube bending mechanism in the medical catheter and medical device according to the embodiment of the present invention Figure Ⅰ .

[0045] Figure 13 Shows the schematic partial structure of the inner tube bending mechanism in the medical catheter and medical device according to the embodiment of the present invention Figure Ⅱ .

[0046] Figure 14Shows a partial structural schematic of the inner tube control bending mechanism in the medical catheter and medical device according to an embodiment of the present invention Figure Ⅲ 。

[0047] Figure 15 Shows a structural schematic of the inner tube control bending mechanism in the medical catheter and medical device according to an embodiment of the present invention in the first embodiment Figure Ⅰ 。

[0048] Figure 16 Shows a structural schematic of the inner tube control bending mechanism in the medical catheter and medical device according to an embodiment of the present invention in the first embodiment Figure Ⅱ 。

[0049] Figure 17 Shows a structural schematic diagram of the inner tube control bending mechanism in the medical catheter and medical device according to an embodiment of the present invention in the second embodiment.

[0050] Figure 18 Shows a structural schematic diagram of the inner tube locking mechanism in the medical catheter and medical device according to an embodiment of the present invention in the first embodiment.

[0051] Figure 19 Shows a structural schematic of the inner tube locking mechanism in the medical catheter and medical device according to an embodiment of the present invention in the second embodiment Figure Ⅰ 。

[0052] Figure 20 Shows a structural schematic of the inner tube locking mechanism in the medical catheter and medical device according to an embodiment of the present invention in the second embodiment Figure Ⅱ 。

[0053] Figure 21 Shows a structural schematic of the inner tube locking mechanism in the medical catheter and medical device according to an embodiment of the present invention in the second embodiment Figure Ⅲ 。

[0054] Figure 22 Shows a structural schematic diagram of the inner tube locking mechanism in the medical catheter and medical device according to an embodiment of the present invention in the third embodiment.

[0055] Figure 23 Shows a structural schematic diagram of the inner tube locking mechanism in the medical catheter and medical device according to an embodiment of the present invention in the fourth embodiment

[0056] Figure 24 Shows a schematic diagram of the outer tube being inserted into the body through the mouth in the medical device according to an embodiment of the present invention.

[0057] Figure 25 Shows a schematic diagram of the outer tube searching for the pylorus in the stomach in the medical device according to an embodiment of the present invention.

[0058] Figure 26The figure shows a schematic diagram of the outer tube of the medical device in an embodiment of the present invention passing through the pylorus in the stomach.

[0059] Figure 27 The figure shows a schematic diagram of the outer tube of the medical device in an embodiment of the present invention entering the duodenum.

[0060] Figure 28 The figure shows a schematic diagram of the support part of the medical device in an embodiment of the present invention expanding the internal space of the intestine.

[0061] Figure 29 The figure shows a schematic diagram of the bending section of the outer tube of the medical device in an embodiment of the present invention bending to find the papilla and inserting a guide wire.

[0062] Figure 30 The figure shows a schematic diagram of the head end of the inner tube of the medical device in an embodiment of the present invention inserting into the papilla.

[0063] Figure 31 The figure shows a schematic diagram of the biopsy forceps extending out through the inner tube instrument channel of the medical device in an embodiment of the present invention.

[0064] Reference numerals in the drawings: Reference numerals in the drawings: 1. Handle body;

[0065] 101. Inner tube locking mechanism; 10100. Locking nut; 101001. Internal thread hole; 10101. Inner tube locking gasket; 101010. First clamping hole; 10102. Locking seat; 101020. External thread; 10103. First limit buckle; 10104. Clamping seat; 10105. Rotating disk; 101051. Handle mounting port; 101052. First sliding groove; 101053. Rotating disk through hole; 10106. Anti-rotation buckle groove; 10107. Rotating handle; 10108. Fixed disk; 101081. Second sliding groove; 101082. Fixed disk through hole; 10109. Clamping piece; 101091. First protrusion; 101092. Second protrusion; 101093. Second clamping hole; 10110. Clamping end; 10111. Hinge; 10112. Fixed end; 10113. Clamping handle; 10114. Clamping port; 10115. Sleeve; 10116. Pipe sleeve; 10117. First tooth; 10118. Second tooth.

[0066] 102. Outer tube bending self-locking mechanism; 10201. Spring pin; 10202. Limit rod; 102021. Tooth; 10203. Second limit buckle;

[0067] 103, Left housing; 104, Right housing; 105, Lifting pliers handle; 106, Lifting pliers turntable; 1061, Tooth groove; 107, Upper turntable knob; 108, Lower turntable knob; 109, Locking knob; 110, Three-way piece; 111, Balloon valve; 112, Lifting pliers pull rod buckle; 113, Lifting pliers pull rod; 114, Slide block buckle; 115, Lifting pliers slide block; 116, Lifting pliers slide plate; 1161, Buckle sliding groove; 1162, Cable hole; 117, Inner tube channel; 118, Lower turntable edge; 119, Lower turntable; 1191, Fixed shaft mounting hole; 120, Fixed shaft; 121, Lower turntable spring piece; 122, Lower turntable spring piece positioning plate; 123, Lower turntable spring piece sliding groove; 124, Lower turntable cable; 125, Lower turntable cable buckle; 126, Upper turntable edge; 127, Upper turntable; 128, Upper turntable spring piece; 129, Upper turntable spring piece positioning plate; 130, Upper turntable spring piece sliding groove; 131, Upper turntable cable; 132, Upper turntable cable buckle; 133, Turntable baffle; 134, Inner tube connector; 135, Outer tube transition connector; 136, Cable cover plate; 137, Water injection and gas injection pipe; 138, Suction port; 139, Locknut; 140, Rotation limit block; 1401, Protrusion; 141, Fixed limit block; 1411, Surface; 1421, First locking gasket; 1422, Second locking gasket; 143, Channel hole; 144, Pressure bar; 145, Locking handle; 146, Axle seat; 1461, Shaft; 147, Locking piece; 148, Spring;

[0068] 2, Medical catheter; 201, First main section; 2011, First passage; 20111, First hole; 2012, First opening; 2013, Second opening; 2014, First tube; 20141, First cavity; 202, First bending section; 203, First head section; 2031, Second hole; 2032, First mounting port; 2033, Third hole; 2034, Second mounting port; 2035, Camera assembly; 2036, First light source; 204, Second tube; 2041, Second cavity; 205, Second passage; 2051, Third tube; 2052, Third cavity; 2053, Fourth tube; 2054, Fourth cavity; 2055, Fourth hole; 2056, Fifth tube; 20561, Fifth cavity; 206, Third passage; 2061, Sixth tube; 2062, Sixth cavity; 2063, Fifth hole; 207, First outer layer; 208, Second outer layer;

[0069] 3. Outer tube; 301. Outer tube pulling wire; 302. Second main body section; 3021. Passage; 3022. Lumen; 3023. Second center; 303. Support part; 3031. First center; 3032. Accumulation cavity; 304. Second bending section; 305. Second head section; 3051. Second pulling wire hole; 3052. Second light source; 3053. Inner tube mounting hole; 3054. Opening; 306. Third pulling wire hole. Detailed implementation manners

[0070] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the medical catheter and medical device proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and all use non-precise scales, and are only used to conveniently and clearly assist in explaining the objectives of the implementation manners of the present invention. In order to make the objectives, features and advantages of the present invention more obvious and understandable, please refer to the accompanying drawings. It should be noted that the structures, scales, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have any technical substance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the objectives that can be achieved, should still fall within the scope covered by the technical content disclosed by the present invention.

[0071] In order to more clearly describe the structures of the above-mentioned medical catheter and medical device, the present invention defines the terms "distal end" and "proximal end". The above terms are special terms in the field of medical devices. Specifically, the "proximal end" refers to the end close to the operator during the operation, and the "distal end" refers to the end that enters the human body away from the operator during the operation. Figure 1 For example, Figure 1 the left side of Figure 1 is the proximal end, and

[0072] The specific structure of the medical catheter 2 is described as follows:

[0073] Please refer to Figures 1 to 4 , the medical catheter 2 includes a first main body section 201, a first bending section 202 and a first head section 203. The distal end of the first main body section 201 is connected to the proximal end of the first bending section 202, and the distal end of the first bending section 202 is connected to the proximal end of the first head section 203.

[0074] Specifically, the above-mentioned first main body section 201 adopts a flexible main body tube, and the first bending section 202 adopts a multi-cavity tube. The softness of the multi-cavity tube is softer than that of the flexible main body tube, and the cross-section of the multi-cavity tube is the same as that of the flexible main body tube. In other embodiments of the present invention, the first bending section 202 may also adopt a bending section formed by connecting multiple bending joints, and the structure of the multi-cavity tube or the bending section adopts the prior art.

[0075] The first main body section 201 has:

[0076] A first passage 2011 for configuring a medical device; for the medical device to pass through and be movable along the first passage 2011. In the embodiment of the present invention, the medical device adopts a biopsy forceps.

[0077] At least one second passage 205, and the second passage 205 is used for configuring a medium and passing a circuit, and the medium is specifically a liquid medium or a gas medium.

[0078] At least one third passage 206, and the third passage 206 is used for configuring a pull wire.

[0079] The following describes the specific structure of the first main body section 201 of the medical catheter 2 in the first embodiment:

[0080] Please refer to Figures 2 to 4 , when the outer diameter of the medical catheter 2 (i.e., the first main body section 201, the first bending section 202, and the first head section 203) remains unchanged, the inner diameter of the first passage 2011 is enlarged to 1.2 mm to 2.8 mm. Specifically, the first passage 2011 is a first hole 20111 axially penetrating through the first main body section 201. The first hole 20111 is a circular hole. Preferably, the aperture of the first hole 20111 is 1.8 mm. In other embodiments of the present invention, the first hole 20111 may be any shape other than a circular hole.

[0081] Furthermore, please refer to Figure 2 , in another alternative embodiment of the present invention, the first passage 2011 is a first tube 2014 penetrating through the first main body section 201, wherein the first tube 2014 is embedded in the first hole 20111. The inside of the first tube 2014 forms a first cavity 20141. In this embodiment, the first hole 20111 is used to install the first tube 2014, and the inner diameter of the first cavity 20141 is for passing and moving the instrument. When the first tube 2014 is adopted, the inner diameter of the cavity of the first cavity 20141 is enlarged to not more than 1.8 mm when the outer diameter of the medical catheter 2 remains unchanged.

[0082] The following describes the specific structure of the second passage 205 as follows:

[0083] Please refer toFigure 3 and Figure 4 The second passage 205 forms an open structure on the first main body section 201. The open structure has openings formed on the outer side of the first main body section 201, and the openings are recessed radially towards the center of the first main body section 201. Specifically, in the embodiment of the present invention, there are two openings, namely the first opening 2012 and the second opening 2013.

[0084] At least one outer layer structure is covered on the outer side of the first main body section 201. In the embodiment of the present invention, the outer layer structure is the first outer layer 207 and the second outer layer 208. The first outer layer 207 is specifically a woven layer, and the second outer layer 208 is specifically an epidermis layer. The first outer layer 207 covers the outer side of the first main body section 201, and the second outer layer 208 covers the first outer layer 207. When the outer side of the first main body section 201 is covered by the first outer layer 207, the inner side of a part of the first outer layer 207 closes the first opening 2012 and the second opening 2013 to form a closed area.

[0085] Please continue to refer to Figure 3 In another alternative embodiment of the present invention, the second passage 205 can also be a third tube 2051 provided at the first opening 2012 and a fourth tube 2053 provided at the second opening 2013. The fourth tube 2053 has a fourth cavity 2054 for the flow of a medium, and the third tube 2051 has a third cavity 2052 for arranging a circuit.

[0086] The third tube 2051 has a side that fits and has a shape adapted to the recessed part of the opening. Specifically, the third tube 2051 and the fourth tube 2053 preferably adopt an oval design, so that the third cavity 2052 inside the third tube 2051 and the fourth cavity 2054 in the fourth tube 2053 also form an oval cavity, thereby enabling a larger gas volume and liquid flow rate when the second passage 205 is used to introduce gas or liquid. In the remaining embodiments of the present invention, the third tube 2051 and the fourth tube 2053 can also adopt any shape other than oval, as long as it can satisfy the flow of the medium and the installation of the circuit.

[0087] The above-mentioned first passage 2011 and the second passage 205 are independently arranged, so that the second passage 205 for introducing electricity, liquid or gas does not occupy the space where the first passage 2011 is opened in the first main section 201. As a result, the inner diameter of the hole of the first passage 2011, that is, the first hole 20111, or the inner diameter of the tube of the first tube 2014 can be maximally set. Without changing the outer diameter of the first main section 201, the inner diameter of the hole of the first hole 20111 or the inner diameter of the tube of the first tube 2014 can be expanded to 1.8 mm (the diameter of this channel in the original traditional structure was only 1.2 mm) without changing the outer diameter of the medical catheter 2. The area is almost doubled, so that a conventional biopsy forceps with an outer diameter of 1.5 mm can flexibly enter and be used, and the sampling volume is greatly increased, and the sampling times are reduced. Moreover, the scope of use of the instrument is expanded, such as stents, stone extraction baskets, etc.

[0088] Further, please refer to Figure 4 , the third passage 206 is at least one fifth hole 2063 opened on the first main section 201. The inner diameter of the fifth hole 2063 is smaller than the inner diameter of the first hole 20111. The fifth hole 2063 is used to introduce a wire for controlling the bending degree of the first bending section 202. In the embodiment of the present invention, the fifth hole 2063 is four to correspond to the first bending section 202 of the medical catheter 2, which can be controlled by a handle and controlled up, down, left, and right. Specifically, the wires in the above-mentioned fifth hole 2063 are configured as the upper wheel disc wire 131 and the lower wheel disc wire 124.

[0089] In other embodiments of the present invention, the third passage 206 can also adopt a tube structure such as the sixth tube 2061. The inside of the sixth cavity 2062 of the sixth tube 2061 is used to introduce a wire for controlling the bending degree of the first bending section 202.

[0090] Further, please refer to Figure 2 , a first mounting opening 2032 and a second mounting opening 2034 are opened on the first head section 203. The first mounting opening 2032 is used to mount the camera assembly 2035, and the second mounting opening 2034 is used to mount the first light source 2036. Specifically, the camera assembly 2035 and the first light source 2036 both adopt existing technologies, and only need to achieve the visualization effect and illumination effect of the first head section 203. The present invention does not elaborate on the structures of the camera assembly 2035 and the first light source 2036.

[0091] A second hole 2031 is opened on the first head section 203. The second hole 2031 penetrates the first head section 203 and communicates with the second passage 205. In the embodiment of the present invention, it is specifically communicated with the third cavity 2052 in the third tube 2051. A third hole 2033 penetrates the first head section 203 and is used to communicate with the first passage 2011. In the embodiment of the present invention, it is specifically communicated with the first cavity 20141 in the first tube 2014.

[0092] Please refer to Figure 5 , the following describes the specific structure of the first main section 201 of the medical catheter 2 in the second embodiment:

[0093] Different from the medical catheter 2 in the first embodiment, in this embodiment, the shape of the first main section 201 remains unchanged, but the relative positions of the first passage 2011 and the second passage 205 are changed, wherein the first passage 2011 is disposed inside the second passage 205, and the first passage 2011 and the second passage 205 are coaxially or non-coaxially arranged. Four fifth holes 2063 are also formed on the first main section 201 for arranging the inner tube pull wire to control the bending degree of the medical catheter 2.

[0094] Specifically, please refer to Figure 5 , a fourth hole 2055 is formed on the first main section 201, and the first passage 2011 is specifically a second tube 204 disposed in the fourth hole 2055. The second tube 204 has a second cavity 2041 for introducing medical devices. The second passage 205 is jointly constituted by a fifth tube 2056 disposed in the fourth hole 2055 and the inner space of the hole in the fourth hole 2055 except for the second tube 204 and the fifth tube 2056. The fifth cavity 20561 of the fifth tube 2056 serves as a second passage 205 for installing circuits / wires, and the inner space of the hole except for the second tube 204 and the fifth tube 2056 serves as another second passage 205 for the transportation of liquid or gas media. By using the second passage 205 for the transportation of liquid or gas media, the space utilization rate is greatly improved, and the inner diameter of the fourth hole 2055 can be expanded to 1.8 mm without increasing the overall outer diameter of the medical catheter 2, so as to obtain the same technical effect as that of the first embodiment above.

[0095] The following describes the specific structure of the outer tube:

[0096] Please refer to Figures 6 to 8 , the outer tube 3 includes a second main section 302, a second bending section 304 and a second head section 305. The proximal end of the second head section 305 is connected to the distal end of the second bending section 304. The proximal section 304 of the second bending section is connected to the distal end of the second main section 302. The proximal end of the second main section 302 is connected to the handle, and further includes

[0097] a support portion 303. The support portion 303 is at least one and is disposed at the distal end of the second main section 302. The inside of the support portion 303 has an accumulation cavity 3032;

[0098] a passage 3021. The passage 3021 penetrates through the second main section 302. The distal end of the passage 3021 communicates with the accumulation cavity 3032. The proximal end of the passage 3021 is connected to the handle;

[0099] The support portion 303 is injected with a medium through the passage 3021 into the accumulation cavity 3032 to expand the support portion 303 or the medium is withdrawn from the accumulation cavity 3032 through the passage 3021 to contract the support portion 303. Specifically, in the embodiment of the present invention, the support portion 303 is a balloon.

[0100] Please refer to Figure 10 , the three-way member 110 is installed on the right housing 104 of the handle body 1, and the three-way member 110 is used to connect the water or gas path to facilitate the introduction of liquid or gas into the support portion 303.

[0101] Specifically, please continue to refer to Figures 6 to 8 , the first center 3031 of the support portion 303 is not concentric with the second center 3023 of the second main body section 302. The non-concentricity causes the support portion 303 to have one or more connection ends connected to the passage 3021 on the second main body section 302, and the connection ends are hermetically connected to the mouth of the passage 3021. In this embodiment, there is only one connection end, which can be a connection port to facilitate communication with the passage 3021. The non-concentricity causes the support portion 303 to be eccentrically arranged with respect to the second main body section 302. The eccentric arrangement causes the support portion 303 to expand only in one direction when it expands, and the support portion 303 expands and drives the entire outer tube to move and closely adhere to the intestinal wall. The intestinal space is expanded by the support portion 303 to increase the distance from the medical catheter 2 to the papilla, providing space and stability for the operation of the medical catheter 2.

[0102] Furthermore, please continue to refer to Figure 7 and Figure 8 , a third wire-drawing hole 306 and a lumen 3022 are formed on the second main body section 302. The lumen 3022 is used for the inner tube 2 to pass through. A second wire-drawing hole 3051 is also formed on the second head section 305. A wire-drawing hole is also formed in the second bending section 304 and corresponds to the above-mentioned third wire-drawing hole 306 and the second wire-drawing hole 3051 for the outer tube wire 301 to pass through. Please refer to Figure 8 , an opening 3054 and an inner tube mounting hole 3053 are formed on the second head section 305. The opening 3054 is formed along the axial direction of the second head section 305. The inner tube mounting hole 3053 and the opening 3054 communicate with each other. The opening 3054 can make the inner tube 2 bend at a larger angle in a certain direction, facilitating the user's operation.

[0103] Furthermore, please continue to refer to Figure 7 and Figure 8, a second light source 3052 is further provided on the second head section 305 of the outer tube 3. The second light source 3052 is preferably an LED or an optical fiber. When the medical catheter 2 and the outer tube 3 enter the stomach together, the light source can illuminate the large space in the stomach. Wire holes for wires to pass through are also provided on the second bending section 304 and the second main section 302 to supply electrical energy to the LED or the optical fiber through the wires. The specific arrangement form of the wire holes belongs to the well-known technology of those skilled in the art and will not be elaborated in the present invention.

[0104] The specific structure of the medical device is described below:

[0105] As Figure 9 described, the medical device includes the above-mentioned medical catheter 2 and an outer tube 3 and a handle used in cooperation with the medical catheter 2. The proximal end of the outer tube 3 is connected to the handle, and the proximal end of the medical catheter 2 is also connected to the handle. The distal end of the medical catheter 2 enters the handle through the channel of the handle and penetrates into the outer tube 3 from the proximal end of the outer tube 3 and extends out from the distal end of the outer tube 3.

[0106] The specific structure of the handle is described below:

[0107] Please refer to Figure 10 , the handle according to the embodiment of the present invention includes:

[0108] A handle body 1, the handle body 1 has a channel hole 143. The distal end of the outer tube 3 is connected to the handle body 1 through an outer tube transition connector 135. The medical catheter 2 enters the inside of the handle body 1 through the channel hole 143 and enters the outer tube 3 from the distal end of the outer tube 3 for use in cooperation with the outer tube 3.

[0109] Specifically, please refer to Figure 10 , the handle body 1 is formed by fixedly connecting a left housing 103 and a right housing 104.

[0110] The specific structure of the outer tube bending control mechanism is described below:

[0111] Please refer to Figure 10 and Figure 11 , the handle further includes an outer tube bending control mechanism. The outer tube bending control mechanism is arranged inside the handle body 1 and is used to control the bending degree of the outer tube 3, specifically the bending degree of the proximal end of the outer tube 3.

[0112] Please continue to refer to Figure 10 and Figure 11 , the outer tube bending control mechanism includes:

[0113] A first rotating part;

[0114] The first movable part is connected to the first rotating part. The rotating part is provided with a rotating pair and can move between a first position and a second position through the movable part;

[0115] The outer tube pull wire 301, the distal end of the outer tube pull wire 301 is connected to the movable part, and the proximal end of the outer tube pull wire 301 extends into the outer tube 3 and is connected to the proximal end of the outer tube 3.

[0116] The following describes the specific structure of the first rotating part in the outer tube bending control mechanism:

[0117] Please refer to Figure 15 , specifically, the first rotating part in the handle in the embodiment of the present invention specifically adopts the forceps lifting handle 105 and the forceps lifting turntable 106, wherein the forceps lifting handle 105 is clamped with the forceps lifting turntable 106 and keeps coaxial.

[0118] The following describes the specific structure of the first movable part in the outer tube bending control mechanism:

[0119] Please continue to refer to Figure 10 and Figure 11 and Figure 15 , the first movable part includes a forceps lifting rod 113, a forceps lifting slider 115 and a forceps lifting slide plate 116. One end of the forceps lifting rod 113 is connected to the forceps lifting turntable 106 through a forceps lifting rod buckle 112, and the other end of the forceps lifting rod 113 is connected to the forceps lifting slider 115 through a slider buckle 114. The forceps lifting slider 115 is installed in the buckle sliding groove 1161 of the forceps lifting slide plate 116, and the forceps lifting slide plate 116 is fixedly connected to the right housing 104 through a plurality of fasteners.

[0120] Furthermore, please refer to Figure 11 , a wire pulling hole 1162 is opened on one side of the buckle sliding groove 1161. The wire pulling hole 1162 is located at the lower part of the forceps lifting slide plate 116 for the outer tube pull wire 301 to pass through the wire pulling hole 1162 and extend into the inner part of the outer tube 3 and be connected to the proximal end of the outer tube 3.

[0121] The following describes the structure of the inner tube bending control mechanism:

[0122] The inner tube bending control mechanism is also arranged inside the handle body 1. The inner tube bending control mechanism is used to control the bending degree of the medical catheter 2. The inner tube bending control mechanism in the handle in the embodiment of the present invention specifically controls the bending degree of the proximal end of the medical catheter 2 in four directions: up, down, left, and right. However, as understood by those skilled in the art, according to different usage environments, the inner tube bending control mechanism can also control the bending degree in only one direction in addition to multiple directions.

[0123] The inner control bending mechanism includes at least one set of control components. One set of control components is used to control two directions of the proximal end of the medical catheter 2. In order to achieve the bending degrees of the proximal end of the medical catheter 2 in the four directions of up, down, left, and right, two sets of control components are adopted in the inner control bending mechanism in the handle of the embodiment of the present invention. In order to ensure that the two sets of control components do not interfere with each other during rotation, the inner control bending mechanism further includes a wheel disc baffle 133. The wheel disc baffle 133 is fixed in the left housing 103, and the above-mentioned control components are respectively arranged on both sides of the wheel disc baffle 133, specifically on the upper and lower sides of the wheel disc baffle 133.

[0124] The control components include:

[0125] A second rotating part, which is rotatably arranged in the handle body 1.

[0126] A first elastic member, the first elastic member is connected to the second rotating part, and the rotating part is given a rotating pair and realizes the movement between the third position and the fourth position through the first elastic member;

[0127] At least one inner tube wire, the proximal end of the inner tube wire is connected to the elastic member, and the distal end of the inner tube wire extends into the medical catheter 2 and is connected to the proximal end of the medical catheter 2.

[0128] The following describes the specific structure of the first set of control components in the inner control bending mechanism:

[0129] Please refer to Figure 12 , specifically, the second rotating part adopts a lower wheel disc 119 in the handle of the embodiment of the present invention. The lower wheel disc 119 is rotatably arranged in the left housing 103. The first elastic member is a lower wheel disc spring piece 121. The center of the lower wheel disc spring piece 121 is fixedly connected to the lower wheel disc 119 through a fastener. The two ends of the lower wheel disc spring piece 121 are respectively welded to the distal ends of a lower wheel disc wire 124. The proximal end of the lower wheel disc wire 124 extends into the medical catheter 2 and extends to be connected to the proximal end of the medical catheter 2.

[0130] Please refer to Figure 12 , further, in order to ensure that the lower wheel disc wire 124 does not bend during the movement, at least one lower wheel disc wire buckle 125 is further arranged in the left housing 103. A positioning port for positioning the lower wheel disc wire 124 is arranged in the lower wheel disc wire buckle 125 for the lower wheel disc wire 124 to pass through.

[0131] Please continue to refer to Figure 12, Further, the left housing 103 is further provided with an inner tube connector 134. The distal end of the medical catheter 2 is connected to the inner tube connector 134. The medical catheter 2 extends from the inner tube connector 134 and enters the interior of the handle body 1 through the passage hole 143. The tube body of the medical catheter 2 between the passage hole 143 and the inner tube connector 134 forms an inner tube loop. By adjusting the size of the inner tube loop, the extension and retraction of the first head section 203 of the medical catheter 2 can be controlled.

[0132] Please continue to refer to Figure 12 , Further, a lower wheel disc edge 118 is fixedly connected to the left housing 103 near the lower wheel disc spring piece 121. The lower wheel disc edge 118 clamps the lower wheel disc spring piece 121 in the gap between the lower wheel disc edge 118 and the lower wheel disc 119. The lower wheel disc spring piece 121 is limited inside the lower wheel disc edge 118 by the lower wheel disc edge 118 to prevent the lower wheel disc spring piece 121 from bouncing and causing errors.

[0133] Please continue to refer to Figure 2 , Further, the inner tube bending control mechanism further includes at least two lower wheel disc spring piece positioning plates 122. Preferably, in the handle of the embodiment of the present invention, there are three lower wheel disc spring piece positioning plates 122. There is a spacing between adjacent lower wheel disc spring piece positioning plates 122 and they are fixed to the lower surface of the wheel disc baffle 133. A lower wheel disc spring piece sliding groove 123 is formed between adjacent lower wheel disc spring piece positioning plates 122. The lower wheel disc spring piece sliding groove 123 can prevent the lower wheel disc spring piece 121 from rubbing against the left housing 103 and other parts on the left housing 103.

[0134] The following describes the specific structure of the second set of control components in the inner tube bending control mechanism:

[0135] The structure and arrangement of the second set of control components are the same as those of the first set of control components. The difference lies in the installation methods of each structure as follows:

[0136] Please refer to Figure 13 and Figure 15, the second rotating part in the second set of control components is the upper wheel disc 127, the upper wheel disc 127 is sleeved on the shaft end of the lower wheel disc 119, and the shaft end of the lower wheel disc 119 extends from the shaft end of the upper wheel disc 127. The upper wheel disc edge 126, three upper wheel disc spring plate positioning plates 129 and multiple upper wheel disc wire clamps 132 are all fixed on the upper surface of the wheel disc baffle 133. The upper wheel disc spring plate 128 is clamped between the upper wheel disc edge 126 and the upper wheel disc 127. Both ends of the upper wheel disc spring plate 128 extend into the upper wheel disc spring plate sliding grooves 130 between adjacent upper wheel disc spring plate positioning plates 129 respectively, and both ends of the upper wheel disc spring plate 128 are respectively connected to the distal ends of a upper wheel disc wire 131. The proximal end of each upper wheel disc wire 131 penetrates through the upper wheel disc wire clamp 132 and extends into the medical catheter 2 and further extends to be connected with the proximal end of the medical catheter 2.

[0137] Please continue to refer to Figure 13 , inside the left housing 103, there is also an inner tube channel 117. The upper end of the inner tube channel 117 is communicated with the channel hole 143, and the lower end of the inner tube channel 117 extends into the outer tube transition connector 135.

[0138] Please refer to Figure 14 , the inner tube bending control mechanism further includes a wire cover plate 136. The wire cover plate 136 is fixedly connected to the upper surface of the wheel disc baffle 133 through fasteners. The wire cover plate 136 covers the upper wheel disc spring plate positioning plates 129 on the upper surface of the wheel disc baffle 133, preventing the upper wheel disc wire 131 from contacting other components and causing unnecessary friction, so as to improve the service life of the upper wheel disc wire 131 and avoid its wear. In addition, the wire cover plate 136 also has a limiting function, and it can limit the upper wheel disc spring plate 128 within the inner space of the wire cover plate 136.

[0139] Next, the outer tube bending self-locking mechanism 102 will be described.

[0140] In order to enable the outer tube 3 to maintain the bending degree after being controlled by the outer tube bending mechanism, the handle is also provided with an outer tube bending self-locking mechanism 102. The outer tube bending self-locking mechanism 102 includes:

[0141] A pressing part, which is arranged in the handle body 1;

[0142] A third rotating part, which is rotatably arranged in the handle body 1. When the pressing part is pressed, the third rotating part can rotate relative to the handle body 1 and be clamped with the first rotating part.

[0143] Specifically, please refer to Figure 11, the pressing part is specifically a spring pin 10201, and the spring pin 10201 is installed on the upper part of the right housing 104, wherein the pin part of the spring pin 10201 extends into the right housing 104. The third rotating part is specifically a limit rod 10202, and a second limit buckle 10203 is fixed on the right housing 104. The limit rod 10202 is in clearance fit with the second limit buckle 10203, so that the limit rod 10202 can rotate relative to the second limit buckle 10203.

[0144] The use process of the above external control bending self-locking mechanism 102 is as follows. When the spring pin 10201 is pressed, it moves downward, so that the pin head of the spring pin 10201 presses on the limit rod 10202, causing the limit rod 10202 to rotate along the second limit buckle 10203 and contact the lifting clamp turntable 106, thereby restricting the rotation of the lifting clamp turntable 106 to achieve self-locking of the outer tube 3 at any bending angle.

[0145] Please refer to Figure 11 , in order to achieve self-locking of the proximal bending part of the outer tube 3 at a specific angle, a plurality of teeth 102021 are provided on the side of the limit rod 10202 in contact with the lifting clamp turntable 106, and a plurality of tooth grooves 1061 meshing with the teeth 102021 are also provided on the outside of the lifting clamp turntable 106 in contact with the limit rod 10202. The setting distance between each tooth 102021 or each tooth groove 1061 can be large or small. If the distance is large, the switching of the proximal bending angle of the outer tube 3 between large angles can be achieved, such as 30°, 60°, 90°, etc. On the contrary, if the small distance is set, the switching of the proximal bending angle of the outer tube 3 between small angles can be achieved. For example, 5°, 10°, 15°, etc.

[0146] The tooth groove structures on the above-mentioned lifting clamp turntable 106 and the limit rod 10202 can also be changed according to different usage situations. For example, soft protrusions can be used to abut against each other, etc. And the present invention is not limited to the above-mentioned setting of the tooth groove 1061 on the lifting clamp turntable 106 or the teeth 102021 on the limit rod 10202. As long as it can achieve the clamping connection when the lifting clamp turntable 106 and the limit rod 10202 are in contact, any structure is acceptable, and this application does not limit this.

[0147] Next, describe the specific structure of the first embodiment of the internal control bending self-locking mechanism. The internal control bending self-locking mechanism is arranged inside the handle body 1, and it can achieve the locking of the medical catheter 2 in any one of the up, down, left, and right directions.

[0148] The structure of the first embodiment of the internal control bending self-locking mechanism includes:

[0149] The fourth rotating part is rotatably arranged in the handle body 1. Specifically, please refer to Figure 17 , the fourth rotating part includes a pressure rod 144 and a locking handle 145. The locking handle 145 is threadedly connected to the upper end of the pressure rod 144. The lower end of the pressure rod 144 is screwed into a threaded hole opened in the upper part of the left housing 103. The lower end of the pressure rod 144 is respectively connected to the proximal ends of a pair of locking pieces 147. Adjacent locking pieces 147 are adjacent to each other and are connected to a seat 146 through the same shaft 1461. One of the locking pieces 147 is close to the outside of the lower wheel disc 119, and the other locking piece 147 is close to the outside of the upper wheel disc 127. A spring 148 is also connected between the pair of locking pieces 147. The distal ends of the pair of locking pieces 147 on the spring 148 can be relatively opened to release the upper wheel disc 127 and the lower wheel disc 119.

[0150] The working process of the inner control bending mechanism in the first embodiment is as follows:

[0151] Rotate the locking handle 145. The locking handle 145 rotates to drive the pressure rod 144 to rotate and move downward slightly through the thread. During the movement process, the adjacent locking pieces 147 rotate around the shaft 1461, so that the distal ends of the adjacent locking pieces 147 are relatively closed and respectively hold the upper wheel disc 127 and the lower wheel disc 119, thereby realizing the self-locking of the medical catheter 2 in any direction. In the non-self-locking state, the distal ends of the adjacent locking pieces 147 can be relatively opened through the spring 148 to release the self-locking of the upper wheel disc 127 and the lower wheel disc 119.

[0152] The following describes the specific structure of the second embodiment of the inner control bending self-locking mechanism. The inner control bending self-locking mechanism is arranged outside the handle body 1.

[0153] Please refer to Figure 15 and Figure 16 , the inner control bending self-locking mechanism in the second embodiment includes a fixed shaft 120. One end of the fixed shaft 120 is connected to the fixed shaft mounting hole 1191 of the lower wheel disc 119, and the lower wheel disc 119 is connected to the lower wheel disc knob 108. The upper wheel disc 127 is connected to the upper wheel disc knob 107.

[0154] Please refer to Figure 15 and Figure 16, further comprising a fifth rotating part rotatably arranged on the fixed shaft 120. Specifically, the fifth rotating part is composed of a rotating limiting block 140 and a fixed limiting block 141. The outside of the rotating limiting block 140 is connected with a locking knob 109. A convex part 1401 is arranged on the lower surface of the rotating limiting block 140. The surface 1411 of the fixed limiting block 141 opposite to the rotating limiting block 140 is formed to increase gradually from low to high. The surface 1411 enables the rotation of the rotating limiting block 140 to be converted into the axial movement of the fixed limiting block 141. The fixed limiting block 141 and the rotating limiting block 140 are respectively in clearance fit with one end of the fixed shaft 120, and the end of the fixed shaft 120 is screwed with a locknut 139 to prevent the rotating limiting block 140 from disengaging from the fixed shaft 120.

[0155] Gaskets. In the handle of the embodiment of the present invention, since there are two sets of control components, the gaskets are two, namely a first locking gasket 1421 and a second locking gasket 1422 respectively. The first locking gasket 1421 is placed in the opening on the back of the fixed limiting block 141. The second locking gasket 1422 is arranged between the upper turntable knob 107 and the lower turntable knob 108. The second locking gasket 1422 is in clearance fit with the shaft end of the lower turntable 119, and the outer diameter of the second locking gasket 1422 is larger than the central aperture of the lower turntable knob.

[0156] The working process of the inner pipe control and bending locking mechanism in the second embodiment is as follows:

[0157] Please refer to Figure 15 and Figure 16 , rotate the locking knob 109 to drive the rotating limiting block 140 to rotate. After the rotating limiting block 140 rotates along the surface 1411, the fixed limiting block 141 is subjected to an axial extrusion force to realize axial movement. Since the first locking gasket 1421 is arranged on the back of the fixed limiting block 141, the first locking gasket 1421 is extruded and presses the lower turntable knob 108 axially. The lower turntable knob 108 moves under the extrusion force. During the movement, the first locking gasket 1421 is deformed under pressure. After the deformation of the first locking gasket 1421, the damping is increased and the shaft end of the lower turntable 119 is held tightly so that it cannot rotate. At the same time, after the lower turntable knob 108 is extruded, it moves axially at the shaft end of the lower turntable 119 and contacts the upper turntable knob 107, so that the inner diameter of the second locking gasket 1422 at the upper turntable knob 107 contracts radially and holds tightly the shaft end of the upper turntable 127, thereby locking the upper turntable 127. Thus, the locking of the bending degrees of the upper turntable 127 and the lower turntable 119 is realized.

[0158] The following describes the inner pipe locking mechanism 101.

[0159] In order to limit the further movement of the medical catheter 2 relative to the outer tube 3, an inner tube locking mechanism 101 is further provided on the handle body 1. The inner tube locking mechanism 101 is disposed outside the handle body 1 and close to the passage hole 143. The structure of the inner tube locking mechanism 101 in the first embodiment is as follows:

[0160] The inner tube locking mechanism 101 includes a first fixing portion and a first rotating portion rotatably connected to the first fixing portion. The first rotating portion is provided with a rotating pair to rotate relative to the first fixing portion;

[0161] It further includes a clamping portion. The clamping portion is disposed between the first fixing portion and the first rotating portion. After the first rotating portion rotates, it presses on the clamping portion, and the clamping portion is pressed and radially squeezes the inner tube.

[0162] Specifically, please refer to Figure 18 , the first fixing portion is specifically a locking seat 10102, the first rotating portion is specifically a locking nut 10100. One end of the locking seat 10102 has an external thread 101020, and the locking nut 10100 has an internal thread hole 101001 that can be threadedly connected to the external thread 101020. The internal thread hole 101001 penetrates through the locking nut 10100. A through hole for the inner tube to penetrate is also provided on the locking seat 10102. An inner tube locking gasket 10101 is disposed 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 silicone, rubber, etc. A first clamping hole 101010 for the medical catheter 2 to pass through is also provided on the inner tube locking gasket 10101.

[0163] The specific working process of the inner tube locking mechanism 101 in the first embodiment is as follows:

[0164] The locking nut 10100 is screwed onto the external thread 101020 of the locking seat 10102 in the forward direction. During the screwing process, the locking nut 10100 gradually presses the inner tube locking gasket 10101, so that the aperture of the first clamping hole 101010 of the inner tube locking gasket 10101 gradually shrinks to tightly hold the outer diameter of the medical catheter 2, thereby realizing the locking of the medical catheter 2. On the contrary, when the locking nut 10100 is rotated in the reverse direction, the inner tube locking gasket 10101 is no longer pressed and the aperture of the through hole in the inner tube locking gasket 10101 is reset, thereby releasing the medical catheter 2 and enabling the medical catheter 2 to move relative to the outer tube 3.

[0165] The specific structure of the inner tube locking mechanism 101 in the second embodiment is as follows:

[0166] Please refer to Figures 19 to 21, including a clamping seat 10104 and a clamping part. A rotating disk 10105 and a fixed disk 10108 are arranged inside the clamping seat 10104. The clamping part is an adjustable clamping assembly composed of multiple clamping pieces 10109. A second clamping hole 101093 is formed between each clamping piece 10109. The adjustable clamping assembly rotates through the rotating disk 10105 and drives an opening and closing movement, so that the aperture of the second clamping hole 101093 changes radially.

[0167] Among them, the rotating disk 10105 has a first connection part, and the first connection part is a first sliding groove 101052 formed on the rotating disk 10105. A second connection part corresponding to the first connection part is arranged on one side of each clamping piece 10109. The second connection part is specifically a first protrusion 101091 protruding along one side of the clamping piece 10109.

[0168] When the rotating disk 10105 rotates, the first sliding groove 101052 drives the first protrusion 101091 on the clamping piece 10109 to move along the movement path of the first sliding groove 101052.

[0169] Please continue to refer to Figure 19 position Figure 21 , the fixed disk 10108 has a third connection part, and the third connection part is a second sliding groove 101081 formed on the fixed disk 10108. A second protrusion 101092 is arranged on the other side of the clamping piece 10109 and is connected to the second sliding groove 101081. When the second protrusion 101092 on the clamping piece 10109 rotates, it moves along the second sliding groove 101081.

[0170] The multiple clamping pieces 10109 forming the adjustable clamping assembly are evenly distributed circumferentially. Part of the adjacent clamping pieces 10109 are tangent to each other and form the same angle, so that there is no gap between each clamping piece 10109 during the radial opening and closing movement of the adjustable clamping assembly.

[0171] A handle mounting opening 101051 is also formed on the rotating disk 10105 for embedding a rotating handle 10107. A rotating disk through hole 101053 is also formed at the axis of the fixed disk 10108, and a fixed disk through hole 101082 is also formed at the axis of the rotating disk. The above-mentioned rotating disk through hole 101053 and fixed disk through hole 101082 are used for the medical catheter 2 to pass through. The clamping seat 10104 is sleeved outside the rotating disk 10105. A first limiting buckle 10103 extending radially is arranged on the clamping seat 10104. At least one anti-rotation buckle groove 10106 is formed on the outside of the rotating disk 10105 and is used for clamping with the first limiting buckle 10103 to limit the rotation of the rotating disk 10105.

[0172] The specific structure of the inner tube locking mechanism 101 described in Embodiment 3 is as follows:

[0173] The inner tube locking mechanism 101 includes a second fixing part and a second rotating part hinged to the second fixing part, and the other ends of the second fixing part and the second rotating part that are not connected are connected by a fastening device.

[0174] Please refer to Figure 22 , specifically, the second fixing part adopts a fixed end 10112, the second rotating part adopts a clamping end 10110, semi-circular clamping openings 10114 for matching the outer diameter of the medical catheter 2 are respectively formed on the fixed end 10112 and the clamping end 10110, one end of the fixed end 10112 is hinged to one end of the clamping end 10110 through a hinge 10111, and threaded holes are respectively formed at the other ends of the fixed end 10112 and the clamping end 10110. The above-mentioned fastening device is a clamping handle 10113 with threads, and by rotating the clamping handle 10113 to connect with the threaded hole ends of the clamping end 10110 and the fixed end 10112, the clamping end 10110 is pressed against the fixed end 10112 to tightly hold the medical catheter 2.

[0175] The specific structure of the inner tube locking mechanism 101 described in Embodiment 4 is as follows:

[0176] Please refer to Figure 23 , the first part, the first part is connected to the handle body 1, and a hole is formed on the first part.

[0177] The second part, the second part covers the mobile end of the inner tube and can be abutted against the first part through a protruding structure or clamped through a tooth groove structure.

[0178] Specifically, please refer to Figure 14 , the first part is specifically a tube sleeve 10116, the tube sleeve 10116 is arranged on the handle body 1, and a hole for the medical catheter 2 to extend into is formed on the tube sleeve 10116.

[0179] The second part is specifically a sleeve 10115, and the sleeve 10115 covers the mobile end of the medical catheter 2.

[0180] Specifically, the protruding structure refers to at least one convex point arranged on the inner wall of the hole and at least another convex point arranged on the outer side of the sleeve 10115. The convex points are soft structures. By matching the sleeve 10115 with the hole on the tube sleeve 10116, the convex point on the inner wall of the hole abuts against another convex point on the outer side of the sleeve 10115, so as to increase the friction force between the sleeve 10115 and the tube sleeve 10116 to realize the fixation of the medical catheter 2.

[0181] Specifically, the tooth-groove structure refers to at least one second tooth 10118 arranged on the outside of the sleeve 10115 and at least one groove arranged on the inner wall of the hole of the sleeve 10116, or it can also be at least one first tooth 10117 arranged on the inner wall of the hole of the sleeve 10116 and at least one groove arranged on the outside of the sleeve 10115. The tooth-groove structure can also increase the friction between the sleeve 10115 and the sleeve 10116 to achieve fixation of the medical catheter 2.

[0182] The specific use process of the medical device is described below:

[0183] Step 1: Please refer to Figure 24 , pass the head end of the medical catheter 2 through the inner tube locking mechanism 101 and enter the inner tube channel 117 from the channel hole 143, and slowly push the medical catheter 2 until it enters the outer tube 3 and extends 4 to 5 cm from the distal end of the outer tube 3 (in this state, the first curved section 202 of the medical catheter 2 is fully extended).

[0184] Referring to the first embodiment of the inner tube locking mechanism 101, by rotating the locking nut 10100 on the locking seat 10102, the inner tube locking gasket 10101 is squeezed, and the first clamping hole 101010 further clamps the medical catheter 2 in the radial direction, so that the relative position of the medical catheter 2 relative to the outer tube 3 is fixed. The camera assembly 2035 and the first light source 2036 on the medical catheter 2 and the second light source 3052 on the outer tube 3 are turned on for lighting and photography. The user holds the handle with his left hand and holds the outer tube 3 with his right hand, about 20 to 30 cm away from the second head section 305 of the outer tube 3, and inserts the outer tube 3 from the patient's mouth.

[0185] Step 2: Please refer to Figure 25 and Figure 26 In the process of pushing the outer tube 3 with the right hand, the upper wheel disc 127 and the lower wheel disc 119 are constantly rotated with the fingers of the left hand to control the curvature of the medical catheter 2. The specific process is as follows:

[0186] Please refer to Figures 12 to 14 Taking one set of control components as an example, the upper wheel knob 107 is rotated, and the upper wheel knob 107 drives the upper wheel 127 to rotate, thereby controlling the upper wheel spring sheet 128 to move in the upper wheel spring sheet sliding groove 130. The movement of the upper wheel spring sheet 128 further drives the upper wheel pull wire 131 to move. Since the upper wheel pull wire 131 penetrates into the first cavity 20141 of the first tube 2014 in the first main body section 201 of the medical catheter 2 and is connected to the first curved section 202, when the upper wheel pull wire 131 moves, it can drive the first curved section 202 to move to control the bending of the first curved section 202, and cooperate with the image fed back by the camera assembly 2035 to pass through the esophagus into the stomach, and use the first light source 2036 and the second second light source 3052 to illuminate the stomach space, and then pass through the pylorus into the duodenum.

[0187] Step 3: Please refer to Figure 10 and Figure 27 , use a syringe to inject gas or liquid into the passage 3021 of the outer tube 3 through the balloon valve 111 at the stomach tail of the handle through the pipeline, and the gas or liquid passes through the passage 3021 and enters the storage cavity 3032 of the support part 303, so that the support part 303 expands, and the support part 303 expands to prop up the space inside the duodenum. In other embodiments of the present invention, the water injection and gas injection pipe 137 can also be connected to the passage 3021 through the pipeline to transport gas or liquid to the storage cavity 3032 of the support part 303 through the passage 3021.

[0188] Step 4: Please refer to 28 and use the left hand to operate the handle to perform external control bending. The specific process of external control bending is as follows:

[0189] The specific working process of the external control bending mechanism is as follows:

[0190] Please refer to Figure 10 and Figure 11 The user operates the forceps lifting handle 105, and the forceps lifting handle 105 drives the forceps lifting turntable 106 to rotate. The forceps lifting turntable 106 is given a rotating pair and the rotating pair is converted into a moving pair for the forceps lifting slider 115 to move back and forth in the buckle sliding groove 1161 of the forceps lifting slide 116 through the forceps lifting rod 113. During the movement, the forceps lifting slider 115 drives the proximal end of the outer tube 3 to bend through the outer tube pull wire 301, so that the proximal end of the outer tube 3 provides a baffle effect when bending, thereby changing the forward direction of the medical catheter 2 matched with the outer tube 3, and changing the original straight view direction to the side view direction during the process of entering the duodenum, so that the medical catheter 2 can be aligned with the nipple on the side wall of the descending part of the duodenum and continue to enter in the direction of the common bile duct. The medical catheter 2 is withdrawn by the control component to align with the second head section 305 of the outer tube 3. The relative position of the medical catheter 2 and the outer tube 3 is fixed again by the inner tube locking mechanism 101.

[0191] When the second curved section 304 of the outer tube 3 is bent by 90°, since the medical catheter 2 is located in the outer tube 3, the medical catheter 2 is also bent by about 90° along with the outer tube 3. Figure 29 The visual field direction of the first head section 203 of the medical catheter 2 is changed from the same direction as the outer tube 3 to perpendicular to the outer tube 3, forming a side-view observation effect. The user continues to slowly insert the outer tube 3 with his right hand until the nipple structure on the side wall of the twelve straight descending parts is found.

[0192] Please refer to Figure 30, loosen the inner tube locking mechanism 101 to enable the inner tube 2 to continue to penetrate and further control the bending angle of the first bending section 202 of the medical catheter 2 through the inner tube bending control mechanism, so that the nipple appears in the field of view of the first head section 203 of the medical catheter 2. Insert a guide wire through the instrument channel of the handle and sequentially pass through the first cavity 2041 on the first main section 201 of the medical catheter 2 and pass through the first bending section 202 and extend out from the fourth hole 2033, and observe the guide wire entering the bile duct or pancreatic duct through the image transmitted back by the imaging component 2035.

[0193] If the opening of the nipple is small, a cutting knife or a nipple dilation balloon can be inserted along the guide wire to perform the work of dilating the nipple opening. Gradually penetrate the first head section 203 of the medical catheter 2 to search for stones or suspicious tumor protrusions.

[0194] Step 5: After the stone is found, pull out the guide wire and insert an optical fiber or an electrode along the first passage of the medical catheter 2. Specifically, the optical fiber or the electrode sequentially passes through the first bending section 202 from the first cavity 20141 in the first tube 2014 of the medical catheter 2 and extends out from the fourth hole 2033 to perform laser lithotripsy or electrohydraulic lithotripsy.

[0195] Please continue to refer to Figure 31 , when a suspicious tumor protrusion is found, the guide wire can be pulled out and a biopsy forceps can be inserted. The biopsy forceps sequentially pass through the first bending section 202 from the first cavity 20141 in the first tube 2014 of the medical catheter 2 and extend out from the fourth hole 2033 to perform tissue biopsy.

[0196] After the operation, use a syringe to draw out the gas or liquid in the accumulated cavity 3032 of the support part 303 through the suction port 138, the pipeline and the original injection channel, and then pull out the medical catheter 2 and the outer tube 3 from the human body together.

[0197] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0198] The above-described embodiments only represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.

Claims

1. A medical device, characterized in that: It includes a medical catheter (2), an outer tube (3) and a handle used in cooperation with the medical catheter (2). The proximal end of the outer tube (3) is arranged inside the handle, the distal end of the outer tube (3) extends out of the handle, the proximal end of the medical catheter (2) is movably connected to the handle, and the distal end of the medical catheter (2) extends into the handle and penetrates through the outer tube (3). The medical catheter (2) includes a first main body section (201), a first bending section (202) and a first head section (203). The distal end of the first main body section (201) is connected to the proximal end of the first bending section (202), and the distal end of the first bending section (202) is connected to the proximal end of the first head section (203). The first main body section (201) has at least one first passage (2011) for a medical device to penetrate in and out. The outer tube (3) includes a second main body section (302), a second bending section (304) and a second head section (305). The proximal end of the second head section (305) is connected to the distal end of the second bending section (304), the proximal section of the second bending section (304) is connected to the distal end of the second main body section (302), and the proximal end of the second main body section (302) is connected to the handle. It further includes a support part (303). There is at least one support part (303) arranged at the distal end of the second main body section (302), and an accumulation cavity (3032) is formed inside the support part (303). The first center (3031) of the support part (303) is not concentric with the second center (3023) of the second main body section (302).

2. The medical device according to claim 1, characterized in that: The medical catheter further includes at least one second passage (205) and at least one third passage (206). The second passage (205) is used for the flow of a medium or the introduction of an electric circuit, and the third passage (206) is used for arranging a traction wire.

3. The medical device according to claim 2, characterized in that: The first passage (2011) is arranged inside the second passage (205).

4. The medical device according to claim 2, characterized in that: The second passage (205) makes the first main body section (201) have an opening, and the opening is arranged along the outer side of the first main body section (201).

5. The medical device according to claim 4, wherein: The opening is arranged along the axial direction of the first main body section (201).

6. The medical device according to claim 5, wherein: The opening is recessed radially towards the center of the first main body section (201).

7. The medical device according to claim 6, characterized in that: At least one outer layer structure covers the outer side of the first main body section (201).

8. The medical device according to claim 3, characterized in that: The first passage (2011) and the second passage (205) are coaxially arranged.

9. The medical device according to claim 3, wherein: The first passage (2011) and the second passage (205) are non - coaxially arranged.

10. The medical device according to claim 1, characterized in that: When the outer diameter of the first main body section (201) remains unchanged, the inner diameter of the first passage is enlarged to be not more than 1.2 - 2.8 mm.

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