A percutaneous biliary drainage tube with an adjustable locking system

Abstract

The present invention relates to a percutaneous biliary drainage tube with an adjustable locking system, and belongs to the technical field of medical devices. The present invention is composed of a drainage tube body, a tube seat and an adjustable locking system; the front end of the adjustable locking system is fixedly connected and communicated with the end of the drainage tube body through the tube seat; the adjustable locking system is composed of a locking line, a pressure plate, a torsion spring, a locking system base, a conical sealing plug, a first rotating shaft, a second rotating shaft and a support rod, and the inside of the locking system base has a drainage cavity with openings at both ends. The advantages of the present invention are: the locking line can be repeatedly adjusted by the pressure plate, the locking line can be adjusted by pressing the pressure plate, and it is locked when it is released, which solves the problem of difficulty in adjustment after locking and reduces the difficulty of surgical operation; the conical sealing plug can achieve complete sealing between the human body and the outside world, and effectively avoid secondary infection caused by air leakage and liquid leakage. The support rod can effectively fix the pressure plate, strengthen the locking effect, and prevent complications such as displacement and slippage caused by loosening of the locking line.

Description

Technical Field

[0001] The invention relates to a percutaneous biliary drainage tube with an adjustable locking system, belonging to the technical field of medical devices. Background Art

[0002] Percutaneous biliary drainage tube is a medical device that is inserted into the bile duct, gallbladder, etc. through percutaneous and transhepatic puncture under the guidance of imaging equipment (ultrasound, CT, DSA, etc.) for bile drainage or cavity perfusion and flushing. It is widely used in clinical practice due to its smooth and soft surface, good biocompatibility, and multiple drainage side holes.

[0003] The percutaneous biliary drainage tube consists of a tube seat, a drainage tube body, and a locking system. The tip of the drainage tube body is generally curled into a pigtail shape, which is used to fix the inner cavity and prevent the catheter from shifting or slipping. The drainage tube body is soft and smooth, has a good X-ray development effect, has a large inner cavity, and has multiple side holes on the tube wall, which can fully drain. The locking system has a locking line, which is used to curl and fix the pigtail to prevent the pigtail from deforming in the body.

[0004] The locking wire of the traditional locking system is easy to break during operation, and it is not easy to open and close repeatedly after locking, which increases the difficulty of surgery for medical staff; the locking wire is easy to loosen, and the tip pigtail is deformed, causing complications such as catheter displacement and slippage; the locking wire outlet of the locking system is often accompanied by air and liquid leakage, and external bacteria can easily invade, causing secondary infection. Summary of the invention

[0005] The technical problem to be solved by the present invention is to solve the problems of easy breaking of the locking line of existing products, difficulty in repeated operation, loosening of the locking line and air and liquid leakage of the locking system, and to provide a percutaneous biliary drainage tube with an adjustable locking system.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A percutaneous biliary drainage tube with an adjustable locking system, comprising a drainage tube body, a tube seat and an adjustable locking system; the front end of the adjustable locking system is fixedly connected and communicated with the end of the drainage tube body through the tube seat;

[0008] The adjustable locking system consists of a locking line, a pressure plate, a torsion spring, a locking system base, a conical sealing plug, a first rotating shaft, a second rotating shaft and a support rod. The locking system base has a drainage cavity with openings at both ends.

[0009] The locking system base is the carrier of other parts of the locking system. The pressure plate and the torsion spring are placed on the top plane of the locking system base and connected by a first rotating axis. The support rod and the pressure plate are also connected by a second rotating axis. The conical sealing plug is placed in the conical hole opened on the locking system base.

[0010] The locking system base has a drainage cavity with openings at both ends, the front part is the liquid inlet end, the rear part is the liquid outlet end, and the middle part is the grip connection part; the liquid inlet end adopts a 55° British fine thread, which has good anti-loosening and sealing properties and is used to be tightly connected to the tube seat to prevent the fixed end of the locking line assembled therein from loosening and system leakage; the liquid outlet end is shaped like a locking Luer inner cone connector, which can be connected to a three-way valve and a drainage bag (the three-way valve and the drainage bag are essential surgical instruments and have nothing to do with the present invention).

[0011] The holding connection part is provided with a bottom plane above, and a left side wall and a right side wall are respectively provided on both sides of the bottom plane, and a front support part is provided at the front of the bottom plane, and the left side wall, the right side wall and the front support part are integrally formed and connected; a first locking system base axis hole is opened in the middle of the left side wall, and a second locking system base axis hole is opened in the middle of the right side wall; a locking system base limiting groove is provided at a position near the rear of the top plane, and the locking system base limiting groove is L-shaped, one end is connected to the left side wall, and the other end is facing the direction of the front support part, which is used to limit the lower torsion rod position of the torsion spring; a locking system base limiting hole is provided at a position near the liquid outlet end in the bottom plane, and when the pressure plate needs to be locked, the support rod on the pressure plate is rotated to place the head end of the support rod into the locking system base limiting hole.

[0012] The pressing plate comprises an integrally formed pressing plate portion and a pressing plate pressing portion, the pressing plate pressing portion is arranged at the front end of the pressing plate portion, and the angle between the two is ≤90°; an integrally formed and connected pressing plate left leg and a pressing plate right leg are arranged in the middle of both sides below the pressing plate portion, a first pressing plate shaft hole is provided at the lower end of the left leg of the pressing plate, and a second pressing plate shaft hole is provided at the lower part of the right leg of the pressing plate, and the functions of the first pressing plate shaft hole and the second pressing plate shaft hole are to connect the pressing plate with the base of the locking system; a pressing plate groove is provided in the middle of the upper side of the pressing plate portion for placing a support rod, and two protrusions are provided in the middle of the inner side of the groove to clamp the support rod; the pressing plate pressing portion A third pressing plate shaft hole and a fourth pressing plate shaft hole are provided on both sides of the pressing plate groove at the rear end for connecting the support rod; a pressing plate limiting groove is provided at the rear part of the lower side surface of the pressing portion of the pressing plate for limiting the position of the upper torsion bar of the torsion spring; the rear part of the pressing plate limiting groove is a blocking surface to prevent the support rod from excessively rotating to the bottom of the pressing plate; the bottom of the pressing portion of the pressing plate is a wedge-shaped structure, which is tightly matched with the wedge-shaped groove of the locking system base, thereby increasing the sliding friction between the locking line and the locking system base, making it difficult for the locking line to be pulled after locking; the front side of the pressing portion of the pressing plate is a pressing surface, and the angle between the pressing surface and the pressing portion of the pressing plate is an acute angle.

[0013] The front support part is provided with a tapered hole in the direction toward the liquid inlet end, and its tip is connected with the drainage inner cavity through the inner cavity line hole of the locking system base, and a tapered sealing plug whose shape completely matches it is placed in the tapered hole; the angle between the inclined surface of the locking system base of the front support part facing the top plane and the top plane is an obtuse angle; the front end of the top plane is provided with a wedge-shaped groove, which matches the wedge-shaped structure under the pressing part of the pressing plate, and can cooperate with the wedge-shaped structure of the pressing plate to tighten the locking line.

[0014] The support rod has a straight rod, the head end of the support rod is hemispherical, and the tail end is provided with a support rod shaft hole. This shaft hole is installed between the third pressure plate shaft hole and the fourth pressure plate shaft hole. The three shafts are connected by a second rotating shaft, and the support rod can rotate axially.

[0015] The conical sealing plug is made of polymer material, has high elasticity, friction coefficient and deformation resistance; it is placed in the conical hole of the locking system base, blocks the inner cavity wire hole of the locking system base, and presses the locking wire. In the prior art, the locking wire has a smooth surface and high toughness, and the pulling process is difficult to control and is easy to withdraw, resulting in the pigtail rebound, which increases the risk of surgical operation and prolongs the operation time.

[0016] The present invention innovatively designs a conical hole and a conical sealing plug that matches it, and places the locking wire between the two. The conical sealing plug cannot move. When the pressing plate is released to pull the locking wire outward, the part of the conical sealing plug that contacts the locking wire can be slightly deformed, so that the locking wire can be smoothly pulled out; when the pulling stops, the conical sealing plug continues to press the locking wire under the action of the rebound force to avoid the withdrawal of the locking wire; the conical sealing plug increases the sliding friction when the locking wire is pulled, and can better control the pigtail loop. When locked, due to the extrusion of the pressing surface of the pressing plate, the conical sealing plug is enclosed in the conical hole and expands in the conical hole, so that the inner cavity wire hole is not connected to the external environment, thereby effectively preventing the occurrence of air leakage, liquid leakage and the like.

[0017] The first rotating shaft passes through the first locking system base shaft hole, the first pressure plate shaft hole, the torsion spring, the second pressure plate shaft hole and the second locking system base shaft hole in sequence, fixing the pressure plate above the locking system base; the torsion spring is fixed between the pressure plate and the locking system base; the pressing surface of the pressure plate can be completely fitted with the inclined surface of the locking system base; the second rotating shaft passes through the third pressure plate shaft hole, the support rod shaft hole and the fourth pressure plate shaft hole, fixing the support rod to the tail end of the pressure plate, and the support rod enters the locking system base limiting hole. The angle with the pressure plate is 65° to 100°, preferably 90°. The length of the support rod and the angle with the pressure plate determine the amount of pressure that the support rod can provide to the pressure plate; another point is that the support rod, the pressure plate and the locking system base after rotation can form a stable triangular structure, making the entire locking system more stable; combining these two points and the structure itself, the length of the support rod, the position of the base limiting hole and the support angle between the support rod and the pressure plate are finally determined. At the same time, the design limits the maximum rotation angle of the support rod to about 270°. The purpose of this is to limit the movement of the support rod so that it can enter the limiting hole of the base of the locking system in a directional manner, while also enhancing the stability of the structure.

[0018] The torsion spring is located between the base of the locking system and the pressure plate, the upper torsion bar of the torsion spring is placed in the limit groove of the pressure plate, and the lower torsion bar of the torsion spring is placed in the limit groove of the base of the locking system. The torsion spring is made of stainless steel, with a wire diameter of 0.6mm, a coil outer diameter of 3mm, a coil inner diameter of 2.4mm, a torsion bar length of 4mm, and an effective number of turns of 4. In the normal state, the angle between the two torsion bars of the torsion spring is approximately equal to 90°, and after being assembled in the locking system, it is approximately equal to 45°. At this time, the elastic force generated by the torsion spring causes the pressure plate to be pressed tightly against the base of the locking system.

[0019] The tip of the drainage tube is pre-shaped and curled into a pigtail shape, which is retained in the bile duct or gallbladder to fix the tube. Six drainage side holes are evenly distributed on the inner side of the pigtail curl, with a size of 2.5 mm × 0.5 mm and a hole-to-hole spacing of 8 mm. The six drainage side holes and the large aperture ensure the drainage effect, and the appropriate spacing prevents the tube from deforming when curled or squeezed. The drainage side holes are distributed on the inner side of the curl of the tip of the tube and do not directly contact the bile duct or gallbladder wall, greatly reducing the risk of tube blockage. Two tube line holes are provided at the tip of the drainage tube, the first tube line hole is 9 mm away from the tip of the catheter, and the second tube line hole is 80 mm away from the tip of the catheter. As the locking line is pulled, the two tubes are locked. The spacing between the wire holes is the circumference of the pigtail loop. The diameter of the pigtail is about 22mm, and it can be stably fixed in most bile ducts (the normal common bile duct diameter is about 6mm-8mm, and the bile duct will expand significantly after obstruction, and the diameter of the obstructed part will exceed 10mm, or even 20mm. The size of the present invention is suitable for most obstruction situations); the surface of the drainage tube body is marked with scale marks, which is convenient for doctors to judge the puncture depth during surgery and postoperative care (after surgery, medical staff can preliminarily judge whether the drainage tube is offset from the scale, and the scale is a prior art); there is a developing ring at the end of the pigtail, which is developed under X-ray, making it convenient for doctors to track the position of the tip of the drainage tube, and the entire drainage tube body can be clearly developed under X-ray.

[0020] The interior of the tube seat is a 55° British fine-pitch thread, which has good anti-loosening and sealing properties. It is tightly connected to the base of the locking system, which can prevent the fixed end of the locking line assembled inside from loosening and system leakage. The outside is provided with anti-slip grooves to facilitate production and assembly. The tube seat is used to connect the drainage tube body and the adjustable locking system, and to fix the fixed end of the locking line.

[0021] The locking wire is a medical suture (for example, 3-0 medical suture, a market product), which has a smooth surface, good toughness, wear resistance and good biocompatibility; the fixed end of the locking wire is inserted into the first tube body wire hole from the outside of the drainage tube body, and the free end of the locking wire is inserted into the second tube body wire hole from the outside of the drainage tube body to enter the inner cavity of the drainage tube body, and the two ends of the locking wire are led out from the tail end of the drainage tube body and passed through the tube seat; the fixed end of the locking wire is screwed and fixed to the tube seat through the 55° British fine thread of the locking system base 1, and it is retained at the tube seat; the free end of the locking wire is passed through the drainage inner cavity of the locking system base and the inner cavity wire hole of the locking system base in sequence, and led out from the tapered hole.

[0022] The method of using this disclosure is as follows:

[0023] 1. Hold the base of the locking system with your hand and press the pressure plate with your thumb. The wedge-shaped structure of the pressure plate slides out of the wedge-shaped groove of the locking system base, and the locking line loosens;

[0024] 2. Pull the locking wire outward until the tip of the drainage tube curls into a pigtail shape; release the pressure plate with your thumb, and under the rebound effect of the torsion spring, the pressure surface of the pressure plate will automatically return to its original position and fit tightly with the inclined surface of the locking system base, while squeezing the conical sealing plug to completely seal the inner cavity wire hole of the locking system base;

[0025] 3. Rotate the support rod that is clamped in the groove of the pressure plate and clamp its head end in the limiting hole of the locking system base to strengthen the locking.

[0026] 4. If the drainage tube needs to be adjusted during the operation, just lift the pressure plate slightly, take the support rod out of the limit hole, insert it into the pressure plate groove above the pressure plate, and then press the pressure plate again. At this time, you can continue to adjust the locking line. After the adjustment is completed, lock it again according to the above step 3.

[0027] The advantages of the present invention are as follows: 1. The adjustable locking system can repeatedly adjust the locking line through the pressure plate. The locking line can be adjusted by pressing the pressure plate, and it is locked when the pressure plate is released, which solves the problem of difficulty in adjustment after locking in clinical practice and reduces the difficulty of surgical operation for medical staff; 2. The conical sealing plug can achieve complete sealing between the human body and the outside world, effectively avoiding secondary infection caused by air leakage and liquid leakage. 3. The support rod can effectively fix the pressure plate, strengthen the locking effect, and prevent complications such as displacement and slippage caused by loosening of the locking line. 4. The surface of the tube seat and the adjustable locking system structure is smooth, and the threading and fixing methods of the locking line are simple, which can reduce the risk of the locking line breaking during operation. Due to the material of the locking line, it is resistant to stretching, but has poor resistance to radial shear force, so the surface of the design structure is smooth to reduce the influence of edges or other protrusions on the locking line; the locking method abandons the traditional winding method and designs a simpler external force. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0029] Figure 1 The overall structure diagram of the present invention is shown

[0030] Figure 2 Cross-sectional view showing the adjustable locking system of the present invention

[0031] Figure 3 Figure 1 shows the locking system base parts of the present invention

[0032] Figure 4 The support rod parts diagram of the present invention is shown

[0033] Figure 5A A diagram showing the pressure plate parts of the present invention from an oblique side view Figure 5B A diagram showing the pressure plate parts of the present invention from an oblique side upward angle

[0034] Fig. 6A A side view showing the torsion spring components of the present invention

[0035] Figure 6B The front view of the torsion spring part of the present invention is shown

[0036] Figure 7 A cross-sectional view showing the tip of the drainage tube of the present invention

[0037] Figure 8 A diagram showing the method of using the present invention

[0038] The marks in the figure are as follows:

[0039] 1. Lock the system base

[0040] 2. Locking line

[0041] 3. Support rod

[0042] 4. Torsion spring

[0043] 5. Press plate

[0044] 6. Conical sealing plug

[0045] 7.Tube socket

[0046] 8. Drainage tube body

[0047] 9. Development ring

[0048] 10. First rotation axis

[0049] 11. Second rotation axis

[0050] 12.55° British fine thread

[0051] 13. Anti-slip pattern

[0052] 21.Fixed end of locking wire

[0053] 22. Free end of locking wire

[0054] 31. Straight Bar

[0055] 51. Press plate

[0056] 52. Pressing plate pressing part

[0057] 101. Locking system base limit slot

[0058] 102. Locking system base bevel

[0059] 103. Wedge groove

[0060] 104. Locking system base limit hole

[0061] 105. Cone hole

[0062] 106. Locking system base inner cavity wire hole

[0063] 107. Locking Luer cone connector 108. Drainage lumen

[0064] 109. Top plane

[0065] 110. Left wall

[0066] 111. Right wall

[0067] 112. Front support 1101. First locking system base shaft hole 1111. Second locking system base shaft hole 113. Liquid inlet end

[0068] 114. Liquid outlet

[0069] 115.Holding connection

[0070] 301.Support rod shaft hole

[0071] 302. Head end of support rod 401. Torsion rod on torsion spring

[0072] 402. Torsion spring lower torsion bar

[0073] 501.Press plate limit slot

[0074] 502.Press plate groove

[0075] 5021. Bump

[0076] 503. Pressed Noodles

[0077] 504. Press plate wedge structure 505. First press plate shaft hole 506. Second press plate shaft hole 507. Third press plate shaft hole 508. Fourth press plate shaft hole 509. Press plate right leg

[0078] 510. Press the left leg

[0079] 511. Blocking surface

[0080] 801. Drainage side hole

[0081] 802. First tube body line hole 803. Second tube body line hole 804. Drainage tube body tail end DETAILED DESCRIPTION

[0082] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0083] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0084] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0086] Unless otherwise defined, the technical or scientific terms used herein shall have the common meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but indicate the existence of at least one.

[0087] See also Figures 1 to 8 As shown,

[0088] A percutaneous biliary drainage tube with an adjustable locking system, comprising a drainage tube body 8, a tube seat 7 and an adjustable locking system; the front end of the adjustable locking system is fixedly connected and communicated with the end of the drainage tube body 8 through the tube seat 7;

[0089] The adjustable locking system consists of a locking wire 2, a pressure plate 5, a torsion spring 4, a locking system base 1, a conical sealing plug 6, a first rotating shaft 10, a second rotating shaft 11 and a support rod 3. The locking system base has a drainage cavity 108 with openings at both ends.

[0090] The locking system base 1 is a carrier for other components of the locking system. The pressure plate 5 and the torsion spring 4 are placed on the top plane of the locking system base and connected by a first rotating shaft 10; the support rod 3 and the pressure plate 5 are also connected by a second rotating shaft 11; the conical sealing plug is placed in a conical hole 105 opened on the locking system base.

[0091] The locking system base 1 has a drainage cavity 108 with two ends open inside, the front is a liquid inlet end 113, the rear is a liquid outlet end 114, and the middle is a grip connection part 115; the liquid inlet end 113 adopts a 55° British fine thread, which has good anti-loosening and sealing properties, and is used to be tightly connected with the tube seat 7 to prevent the fixed end 21 of the locking line assembled therein from loosening and system leakage; the liquid outlet end 114 is shaped as a locking Luer inner cone connector 107, which can be connected to a three-way valve and a drainage bag (the three-way valve and the drainage bag are essential surgical instruments and have nothing to do with the present invention).

[0092] A bottom plane 109 is provided above the grip connection portion 115, and a left side wall 110 and a right side wall 111 are respectively provided on both sides of the bottom plane 109, and a front support portion 112 is provided at the front of the bottom plane 109, and the left side wall, the right side wall and the front support portion are integrally formed and connected; a first locking system base shaft hole 1101 is provided in the middle of the left side wall 110, and a second locking system base shaft hole 1111 is provided in the middle of the right side wall 111; a locking system base limiting groove 101 is provided near the rear of the top plane 109, and the locking system base limiting groove 101 is L-shaped, one end of which is connected to the left side wall 110, and the other end faces the direction of the front support portion 112, and is used to limit the position of the lower torsion rod 402 of the torsion spring 4; a locking system base limiting hole 104 is provided near the liquid outlet end 114 in the bottom plane 109, and when the pressure plate needs to be locked, the support rod 3 on the pressure plate is rotated to place the head end 302 of the support rod into the locking system base limiting hole 104.

[0093] The pressing plate 5 has an integrally formed pressing plate portion 51 and a pressing plate pressing portion 52, the pressing plate pressing portion 52 is arranged at the front end of the pressing plate pressing portion 51, and the angle between the two is ≤90°; the middle of the two sides below the pressing plate pressing portion 51 are provided with an integrally formed and connected pressing plate left leg 510 and a pressing plate right leg 509, the lower end of the pressing plate left leg is provided with a first pressing plate shaft hole 505, and the lower part of the pressing plate right leg 509 is provided with a second pressing plate shaft hole 506, the first pressing plate shaft hole 505 and the second pressing plate shaft hole 506 are used to connect the pressing plate 5 with the locking system base 1; a pressing plate groove 502 is provided in the middle of the upper side of the pressing plate pressing portion 51 for placing the support rod 3, and two protrusions 5021 are provided in the middle of the inner side of the groove to clamp the support rod; the pressing plate pressing portion 51 A third pressure plate shaft hole 507 and a fourth pressure plate shaft hole 508 are provided on both sides of the pressure plate groove 502 at the rear end for connecting the support rod 3; a pressure plate limiting groove 501 is provided at the rear part of the lower side surface of the pressure plate pressing part 51 for limiting the position of the upper torsion bar 401 of the torsion spring 4; the rear part of the pressure plate limiting groove 501 is a blocking surface 511, which can prevent the support rod 3 from excessively rotating to the bottom of the pressure plate; the bottom of the pressure plate pressing part 52 is a wedge-shaped structure 504, which is tightly matched with the wedge-shaped groove 103 of the locking system base 1, thereby increasing the sliding friction between the locking line 2 and the locking system base 1, making it difficult for the locking line 2 to be pulled after locking; the front side of the pressure plate pressing part 52 is a pressing surface 503, and the angle between the pressing surface 503 and the pressure plate pressing part 51 is an acute angle.

[0094] The front support portion 112 is provided with a tapered hole 105 in the direction of the liquid inlet end 113, and its tip is connected with the drainage cavity 108 through the locking system base cavity line hole 106, and a tapered sealing plug 6 whose shape completely matches it is placed in the tapered hole 105; the angle between the locking system base inclined surface 102 of the front support portion 112 facing the top plane 109 and the top plane 109 is an obtuse angle; the front end of the top plane 109 is provided with a wedge-shaped groove 103, which matches the wedge-shaped structure 504 under the pressing part of the pressure plate, and can cooperate with the pressure plate wedge-shaped structure 504 to tighten the locking line 2.

[0095] The support rod 3 has a straight rod 31, the support rod head end 302 is hemispherical, and a support rod shaft hole 301 is provided at the tail end. This shaft hole is installed between the third pressure plate shaft hole 507 and the fourth pressure plate shaft hole 508. The three shafts are connected by the second rotating shaft 11, and the support rod 3 can rotate axially.

[0096] The conical sealing plug 6 is made of polymer material, has high elasticity, friction coefficient and deformation resistance; it is placed in the conical hole 105 of the locking system base 1, blocks the inner cavity wire hole 106 of the locking system base, and presses the locking wire 2. In the prior art, the locking wire has a smooth surface and high toughness, and the pulling process is difficult to control and is easy to withdraw, resulting in the pigtail rebound, which increases the risk of surgical operation and prolongs the operation time.

[0097] The present invention innovatively designs a conical hole 105 and a conical sealing plug 6 that matches it, and places the locking wire 2 between the two. The conical sealing plug cannot move. When the pressing plate is released to pull the locking wire 2 outward, the part of the conical sealing plug that contacts the locking wire can be slightly deformed, so that the locking wire can be smoothly pulled out; when the pulling stops, the conical sealing plug continues to press the locking wire under the action of the rebound force to prevent the locking wire from being withdrawn; the conical sealing plug increases the sliding friction when the locking wire is pulled, and can better control the pigtail loop. When locked, due to the extrusion of the pressing surface 503 of the pressing plate, the conical sealing plug is enclosed in the conical hole and expands in the conical hole, so that the inner cavity wire hole 106 is not connected to the external environment, thereby effectively preventing the occurrence of air leakage, liquid leakage, etc.

[0098] The first rotating shaft 10 passes through the first locking system base shaft hole 1101, the first pressure plate shaft hole 505, the torsion spring 4, the second pressure plate shaft hole 506 and the second locking system base shaft hole 1111 in sequence to fix the pressure plate 5 above the locking system base 1; the torsion spring 4 is fixed between the pressure plate 5 and the locking system base 1; the pressing surface 503 of the pressure plate can be completely fitted with the inclined surface 102 of the locking system base; the second rotating shaft 11 passes through the third pressure plate shaft hole 507, the support rod shaft hole 301 and the fourth pressure plate shaft hole 508 to fix the support rod 3 to the tail end of the pressure plate 5, and the support rod 3 enters the locking system base limit hole 104 and the angle with the pressure plate is 90°.

[0099] The torsion spring 4 is located between the locking system base 1 and the pressure plate 5, the upper torsion bar 401 of the torsion spring is placed in the pressure plate limit groove 501, and the lower torsion bar 402 of the torsion spring is placed in the locking system base limit groove 101. The torsion spring is made of stainless steel, with a wire diameter of 0.6mm, a coil outer diameter of 3mm, a coil inner diameter of 2.4mm, a torsion bar length of 4mm, and an effective number of turns of 4. In the normal state, the angle between the two torsion bars of the torsion spring is approximately equal to 90°, and after being assembled in the locking system, it is approximately equal to 45°. At this time, the elastic force generated by the torsion spring causes the pressure plate to be pressed tightly against the locking system base.

[0100] The tip of the drainage tube is pre-shaped and curled into a pigtail shape, which is retained in the bile duct or gallbladder to fix the tube. Six drainage side holes 801 are evenly distributed on the inner side of the pigtail curl. The size of the drainage side holes is 2.5mm×0.5mm, and the distance between the holes is 8mm. The six drainage side holes and the large aperture ensure the drainage effect. The appropriate spacing prevents the tube from deforming when curled or squeezed. The drainage side holes are distributed on the inner side of the curl of the tip of the tube and do not directly contact the bile duct or gallbladder wall, greatly reducing the risk of tube blockage. The tip of the drainage tube 8 has two tube line holes, the first tube line hole 802: 9mm away from the tip of the catheter; the second tube line hole 803: 80mm away from the tip of the catheter; as the locking line is pulled The distance between the two tube body holes is the circumference of the pigtail loop. The diameter of the pigtail is about 22mm, which can be stably fixed in most bile ducts (the normal common bile duct diameter is about 6mm-8mm. After the bile duct is obstructed, it will expand significantly, and the diameter of the obstructed part will exceed 10mm, or even 20mm. The size of the present invention is suitable for most obstruction situations); the surface of the drainage tube body 8 is marked with scale marks, which is convenient for doctors to judge the depth of puncture during surgery and postoperative care (after surgery, medical staff can preliminarily judge whether the drainage tube is offset from the scale, and the scale is the existing technology); there is a developing ring 9 at the end of the pigtail, which is developed under X-ray, which is convenient for doctors to track the position of the tip of the drainage tube, and the entire drainage tube body 8 can be clearly developed under X-ray.

[0101] The interior of the tube seat 7 is a 55° British fine pitch thread 12, which has good anti-loosening and sealing properties, and is tightly connected to the locking system base 1, which can prevent the fixed end 21 of the locking line assembled therein from loosening and system leakage; the outside is provided with anti-slip grooves 13, which is conducive to production and assembly; the tube seat 7 is used to connect the drainage tube body 8 and the adjustable locking system, and fix the fixed end 21 of the locking line.

[0102] The locking wire 2 is a medical suture (e.g., 3-0 medical suture, a market product) having a smooth surface, good toughness, wear resistance, and good biocompatibility; the fixed end 21 of the locking wire is passed through the first tube body wire hole 802 from the outside of the drainage tube body, and the free end 22 of the locking wire is passed through the second tube body wire hole 803 from the outside of the drainage tube body to enter the inner cavity of the drainage tube body, and the two ends of the locking wire are led out from the tail end 804 of the drainage tube body and passed through the tube seat 7; the fixed end 21 of the locking wire is screwed and fixed to the tube seat 7 through the 55° British fine thread 12 of the locking system base 1, and is retained at the tube seat 7; the free end 22 of the locking wire is passed through the drainage inner cavity 108 and the inner cavity wire hole 106 of the locking system base 1 in sequence, and is led out from the tapered hole 105.

[0103] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Those skilled in the art can design many other modifications and implementation methods, which will fall within the scope and spirit of the principles disclosed in this application. More specifically, within the scope of the disclosure, drawings and claims of this application, various modifications and improvements can be made to the components and / or layout of the subject combination layout. In addition to the modifications and improvements made to the components and / or layout, other uses will also be obvious to those skilled in the art.

Claims

1. A percutaneous biliary drainage tube with an adjustable locking system, characterized in that: It consists of a drainage tube body, a tube seat and an adjustable locking system; the front end of the adjustable locking system is fixedly connected and communicated with the end of the drainage tube body through the tube seat; The adjustable locking system is composed of a locking wire, a pressure plate, a torsion spring, a locking system base, a conical sealing plug, a first rotating shaft, a second rotating shaft and a support rod. The locking system base has a drainage cavity with openings at both ends. The locking system base is a carrier for other components of the locking system, and the pressure plate and the torsion spring are placed on the top plane of the locking system base and connected by a first rotating shaft; The support rod and the pressure plate are also connected by a second rotating shaft; the conical sealing plug is placed in a conical hole opened on the base of the locking system; The locking system base has a drainage cavity with two openings at both ends, the front part is a liquid inlet end, the rear part is a liquid outlet end, and the middle part is a grip connection part; the liquid inlet end adopts a fine thread and is tightly connected to the tube seat; the liquid outlet end is in the shape of a locking Luer inner cone connector; A bottom plane is provided above the grip connection portion, a left side wall and a right side wall are respectively provided on both sides of the bottom plane, a front support portion is provided at the front of the bottom plane, and the left side wall, the right side wall and the front support portion are integrally formed and connected; a first locking system base shaft hole is provided in the middle of the left side wall, and a second locking system base shaft hole is provided in the middle of the right side wall; a locking system base limiting groove is provided at a position near the rear of the top plane, and the locking system base limiting groove is L-shaped, one end of which is connected to the left side wall, and the other end faces the direction of the front support portion, and is used to limit the lower torsion rod position of the torsion spring; a locking system base limiting hole is provided at a position near the liquid outlet in the bottom plane; The front support part is provided with a tapered hole in the direction toward the liquid inlet end, the tip of which is connected with the drainage inner cavity through the inner cavity line hole of the locking system base, and a tapered sealing plug with a shape that completely matches the tapered hole is placed in the tapered hole; the angle between the inclined surface of the locking system base of the front support part facing the top plane and the top plane is an obtuse angle; A wedge-shaped groove is provided at the front end of the top plane, which matches the wedge-shaped structure below the pressing part of the pressing plate and can cooperate with the wedge-shaped structure of the pressing plate to press the locking line; The torsion spring is located between the locking system base and the pressure plate, the upper torsion rod of the torsion spring is placed in the limiting groove of the pressure plate, and the lower torsion rod of the torsion spring is placed in the limiting groove of the locking system base.

2. A percutaneous biliary drainage tube with an adjustable locking system according to claim 1, characterized in that: The pressing plate comprises an integrally formed pressing plate pressing portion and a pressing plate pressing portion, the pressing plate pressing portion is arranged at the front end of the pressing plate pressing portion, and the angle between the two is ≤90°; an integrally formed and connected pressing plate left leg and pressing plate right leg are arranged at the middle of both sides below the pressing plate pressing portion, a first pressing plate shaft hole is provided at the lower end of the pressing plate left leg, and a second pressing plate shaft hole is provided at the lower part of the pressing plate right leg, the first pressing plate shaft hole and the second pressing plate shaft hole function to connect the pressing plate with the locking system base; a pressing plate groove is provided in the middle of the upper side of the pressing plate pressing portion for placing a support rod Two protrusions are provided in the middle of the inner side of the groove to clamp the support rod; the rear end of the pressure plate pressing part is provided with a third pressure plate shaft hole and a fourth pressure plate shaft hole on both sides of the pressure plate groove for connecting the support rod; a pressure plate limiting groove is provided at the rear part of the lower side of the pressure plate pressing part to limit the position of the upper torsion bar of the torsion spring; the rear part of the pressure plate limiting groove is a blocking surface to prevent the support rod from excessively rotating to the bottom of the pressure plate; the bottom of the pressure plate pressing part is a wedge-shaped structure; the front side of the pressure plate pressing part is a pressing surface, and the angle between the pressing surface and the pressure plate pressing part is an acute angle.

3. A percutaneous biliary drainage tube with an adjustable locking system according to claim 1, characterized in that: The support rod has a straight rod, the head end of the support rod is hemispherical, and the tail end is provided with a support rod shaft hole. This shaft hole is installed between the third pressure plate shaft hole and the fourth pressure plate shaft hole. The three shafts are connected by a second rotating shaft, and the support rod can rotate axially.

4. A percutaneous biliary drainage tube with an adjustable locking system according to claim 1, characterized in that: The conical sealing plug is made of polymer material and has high elasticity, friction coefficient and deformation resistance; it is placed in the conical hole of the locking system base, blocks the inner cavity wire hole of the locking system base, and presses the locking wire.

5. A percutaneous biliary drainage tube with an adjustable locking system according to claim 1, characterized in that: The first rotating axis passes through the first locking system base shaft hole, the first pressure plate shaft hole, the torsion spring, the second pressure plate shaft hole and the second locking system base shaft in sequence to fix the pressure plate above the locking system base; the torsion spring is fixed between the pressure plate and the locking system base; the pressing surface of the pressure plate can be completely fitted with the inclined surface of the locking system base; the second rotating axis passes through the third pressure plate shaft hole, the support rod shaft hole and the fourth pressure plate shaft hole to fix the support rod to the tail end of the pressure plate. After the support rod enters the limiting hole of the locking system base, the angle with the pressure plate is 65°~100°.

6. A percutaneous biliary drainage tube with an adjustable locking system according to claim 1, characterized in that: The tip of the drainage tube body is pre-shaped and curled into a pigtail shape; 6 drainage side holes are evenly distributed on the inner side of the pigtail curl; two tube body line holes are opened at the tip of the drainage tube body, the first tube body line hole and the second tube body line hole; the surface of the drainage tube body is marked with scale marks; and there is a developing ring at the end of the pigtail.

7. A percutaneous biliary drainage tube with an adjustable locking system according to claim 6, characterized in that: The drainage side hole has a size of 2.5 mm×0.5 mm, and the distance between the holes is 8 mm; the first tube body line hole is 9 mm away from the catheter tip; the second tube body line hole is 80 mm away from the catheter tip.

8. A percutaneous biliary drainage tube with an adjustable locking system according to claim 1, characterized in that: The interior of the pipe seat is a 55° British fine pitch thread, which is tightly connected to the base of the locking system; the exterior is provided with anti-slip grooves.

9. A percutaneous biliary drainage tube with an adjustable locking system according to claim 1, characterized in that: The locking wire is a medical suture. The fixed end of the locking wire is inserted into the first wire hole of the drainage tube body from the outside of the drainage tube body, and the free end of the locking wire is inserted into the second wire hole of the drainage tube body from the outside of the drainage tube body to enter the inner cavity of the drainage tube body. The two ends of the locking wire are led out from the tail end of the drainage tube body and passed through the tube seat. The fixed end of the locking wire is screwed and fixed to the tube seat through the fine thread of the locking system base and retained at the tube seat. The free end of the locking wire is passed through the drainage inner cavity of the locking system base and the inner cavity wire hole of the locking system base in sequence and led out from the tapered hole.

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