Sheath applied to biliary tract sub-endoscope

Abstract

The invention relates to the field of medical instruments, and discloses a sheathing canal applied to a biliary tract sub-endoscope, which can enable the biliary tract sub-endoscope to work independently and reduce the fatigue of doctors and the pain of patients. The sheathing canal comprises a sheathing canal body, a tip part and a sheathing canal fixing strip. The sheathing canal body is tubular and is configured to contain a biliary tract sub-mirror. The tip part is arranged at the far end of the sheathing canal body, the far end of the tip part is of a petal-shaped structure, and the tip part is configured to allow the biliary tract sub-mirror to extend out of the tip part. The far end of the sheathing canal fixing strip is connected with the outer surface of the tip part, the sheathing canal fixing strip has a first state and a second state, and the first state is configured to be attached to the outer surface of the tip part when the tip part is in the duodenoscope; in the second state, when the tip part extends out of the duodenoscope, the near end of the sheathing canal fixing strip is separated from the tip part and abuts against the inner wall of the common bile duct.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a sheath tube used in a choledochoscope. Background Art

[0002] The cholecystoscope is often used to observe and treat diseases of the bile duct and pancreatic duct. The commonly used method is to tie it to the handle of the duodenoscope or have it held by an assistant. The doctor first inserts the duodenoscope into the duodenum through the patient's esophagus and stomach, and then inserts the cholecystoscope into the working channel of the duodenoscope. The duodenoscope lifting forceps are used to send the duodenal papilla of the cholecystoscope into the bile duct. This duodenoscope acts as a tube bridge, but due to the structure of the cholecystoscope, although the duodenoscope that completes the work of transporting the cholecystoscope is completely useless, it still needs to remain in the patient's body cavity. At this time, the doctor will often tie the handle of the choledochoscopic sub-scope to the handle of the duodenoscope. The doctor needs to hold the duodenoscope with one hand and control the choledochoscopic sub-scope with the other hand. An assistant is also needed to hold the insertion tube of the choledochoscopic sub-scope and cooperate with the main operator to complete the action of moving the choledochoscopic sub-scope forward. The main operator is prone to fatigue due to holding two scopes. In addition, since the working channel of the duodenoscope is 4.2-4.8mm, the outer diameter of the insertion tube is usually around 12mm, which causes great pain to the patient. Summary of the invention

[0003] The purpose of the present application is to provide a sheath for a choledochoscope, which can enable the choledochoscope to work independently, thereby reducing the doctor's fatigue and the patient's pain.

[0004] The present application discloses a sheath tube applied to a choledochoscope, comprising:

[0005] A sheath body (1), the sheath body (1) is tubular and configured to accommodate a choledochoscope;

[0006] A tip portion (2) is disposed at the distal end of the sheath body (1), the distal end of the tip portion (2) being a flap-like structure configured to allow the choledochoscope to extend from the tip portion (2); and

[0007] A sheath fixing strip (3), the distal end of which is connected to the outer surface of the tip portion (2), the sheath fixing strip (3) having a first state and a second state, the first state being configured to fit the outer surface of the tip portion (2) when the tip portion (2) is inside the duodenoscope, and the second state being configured to separate the proximal end of the sheath fixing strip (3) from the tip portion (2) and abut against the inner wall of the common bile duct when the tip portion (2) extends out of the duodenoscope.

[0008] In a preferred example, the tip portion (2) is a conical structure, and the diameter of the tip portion (2) gradually decreases from the proximal end of the tip portion (2) to the distal end of the tip portion (2).

[0009] In a preferred example, a fixing strip groove (4) is provided on the distal end portion (2), and the fixing strip groove (4) is configured to accommodate the sheath fixing strip (3).

[0010] In a preferred example, the petal-like structure at the distal end of the tip portion (2) is configured to be closed in an initial state, and to have its edges separated and open in a working state.

[0011] In a preferred embodiment, the distal end of the tip portion (2) is composed of 3 to 6 detachable petal-shaped pieces.

[0012] In a preferred example, the tube body of the sheath tube body (1) is composed of three layers of woven mesh tubes.

[0013] In a preferred embodiment, the middle layer of the three-layer woven mesh tube is a metal woven mesh tube, and the inner and outer layers are composite material woven mesh tubes.

[0014] In a preferred example, the wall thickness of the sheath body (1) is 0.2 mm-0.3 mm.

[0015] In a preferred example, the length of the tip portion (2) is 10 mm-12 mm.

[0016] In a preferred embodiment, scale lines are provided on the outer surface of the tip portion (2).

[0017] In the embodiment of the present application, the tubular sheath body can accommodate the choledochoscope and transport the choledochoscope into the duodenoscope and then into the body. Since a flap-like structure is provided on the distal end of the tip portion, the choledochoscope can be separated when it passes through the tip portion, so that the choledochoscope can smoothly enter the common bile duct. In addition, when the tip portion is in the duodenoscope, the sheath fixing strip is retracted and fits the outer surface of the tip portion. When the tip portion extends out of the duodenoscope, the proximal end of the sheath fixing strip is stretched open and stuck on the inner wall of the common bile duct due to elasticity, so that the sheath fixing strip can assist the sheath to be fixed in the common bile duct. At this time, the duodenoscope can be withdrawn to realize the independent operation of the choledochoscope.

[0018] Furthermore, the distal end of the tip portion connected to the sheath body is tapered, which can reduce the resistance when the sheath enters the duodenal milk duct.

[0019] A large number of technical features are recorded in the specification of this application, which are distributed in various technical solutions. If all possible combinations of technical features of this application (i.e., technical solutions) are to be listed, the specification will be too long. In order to avoid this problem, the various technical features disclosed in the above-mentioned invention content of this application, the various technical features disclosed in the various embodiments and examples below, and the various technical features disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (these technical solutions are all deemed to have been recorded in this specification), unless the combination of such technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed, and features C and D are equivalent technical means that play the same role. Technically, only one can be used, and it is impossible to use them at the same time. Feature E can be combined with feature C technically. Then, the solution of A+B+C+D should not be deemed to have been recorded because it is technically infeasible, and the solution of A+B+C+E should be deemed to have been recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view according to an embodiment of the present application;

[0021] Figure 2 is a structural schematic diagram according to an implementation method of the present application;

[0022] Figure 3 is a front view of an embodiment according to the present application.

[0023] Description of reference numerals:

[0024] 1-sheath body; 2-distal end; 3-sheath fixing bar; 4-fixing bar groove. DETAILED DESCRIPTION

[0025] In the following description, many technical details are provided to help readers better understand the present application. However, those skilled in the art can understand that the technical solution claimed in the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0026] the term:

[0027] As used herein, the term "distal end" refers to the end of the sheath that is closer to the common bile duct and the duodenal duct when the sheath is in use, and also refers to the end that is away from the operator;

[0028] As used herein, the term "proximal end" refers to the end of the sheath distal to the common bile duct and the duodenal duct when the sheath is in use, and also refers to the end closer to the operator.

[0029] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments and drawings:

[0030] The present application relates to a sheath tube for a choledochoscope, the structure of which is shown in FIG. Figure 1 , Figure 2 and Figure 3 As shown, the sheath tube comprises: a sheath tube body (1), a front end portion (2) and a sheath tube fixing strip (3).

[0031] The sheath body (1) is tubular and is configured to accommodate a choledochoscope;

[0032] The tip portion (2) is disposed at the distal end of the sheath body (1), and the distal end of the tip portion (2) is a flap-like structure configured to allow the choledochoscope to extend from the tip portion (2); and,

[0033] The distal end of the sheath fixing strip (3) is connected to the outer surface of the tip portion (2), and the sheath fixing strip (3) has a first state and a second state. The first state is configured to fit the outer surface of the tip portion (2) when the tip portion (2) is inside the duodenoscope, and the second state is configured to separate the proximal end of the sheath fixing strip (3) from the tip portion (2) and abut against the inner wall of the common bile duct when the tip portion (2) extends out of the duodenoscope.

[0034] In an optional embodiment, the tip portion (2) is a conical structure, and the diameter of the tip portion (2) gradually decreases from the proximal end of the tip portion (2) to the distal end of the tip portion (2).

[0035] In an optional embodiment, a fixing strip groove (4) is provided on the distal end portion (2), and the fixing strip groove (4) is configured to accommodate the sheath fixing strip (3).

[0036] In an optional embodiment, the petal-like structure at the distal end of the tip portion (2) is configured to be closed in an initial state, and to have its edges separated and open in a working state.

[0037] In an optional embodiment, the distal end of the tip portion (2) is a detachable 3-6 petal-shaped pieces. Preferably, the distal end of the tip portion (2) is a structure of 3 petal-shaped pieces, the side edges of the petal-shaped pieces are deep-cut but remain connected, and when a choledochoscope or other round objects with a larger diameter are passed through, the side edges of the petal-shaped pieces will break and separate, thereby not hindering the advancement of the choledochoscope.

[0038] In an optional embodiment, the tube body of the sheath tube (1) is composed of three layers of woven mesh tube.

[0039] In an optional embodiment, the middle layer of the three-layer woven mesh tube is a metal woven mesh tube, and the inner layer and the outer layer are composite material woven mesh tubes. Optionally, the middle layer is a woven mesh made of flat steel wire. Optionally, the inner layer and the outer layer are composite materials, which are made by a woven mesh tube process. Preferably, the composite material is PTFE or Pebax.

[0040] In an optional embodiment, the wall thickness of the sheath body (1) is 0.2 mm-0.3 mm. Preferably, the wall thickness of the sheath body (1) is 0.2 mm, 0.25 mm or 0.3 mm. Optionally, the outer diameter of the sheath body (1) is generally the maximum diameter of the working channel of the duodenoscope minus 0.1 mm. Preferably, the outer diameter of the sheath body (1) is 4.6 mm, 4.1 mm or 3.6 mm.

[0041] In an optional embodiment, the total length of the sheath is positively correlated with the length from the inlet to the outlet of the working channel of the duodenoscope. Optionally, the total length of the sheath is the length from the inlet to the outlet of the working channel of the duodenoscope + about 100 mm.

[0042] In an optional embodiment, the length of the tip portion (2) is 10mm-12mm.

[0043] In an optional embodiment, scale lines are provided on the outer surface of the tip portion (2). Optionally, scale lines and values ​​are printed every 5 mm at 0-5 cm from the distal end of the tip portion (2).

[0044] In order to better understand the technical solution of the present application, a specific example is provided below for illustration. The details listed in the example are mainly for ease of understanding and are not intended to limit the scope of protection of the present application.

[0045] According to the usual operation, the tip end (2) of the duodenoscope insertion tube is delivered to the duodenum of the patient, and then the sheath body (1) is inserted into the tip end (2) of the duodenoscope along the working channel of the duodenoscope, and it is determined from the image of the duodenoscope that the sheath does not exceed the tip end of the duodenoscope. At this time, since the sheath body (1) and the tip end (2) are located in the working channel of the duodenoscope, the sheath fixing strip (3) is folded and accommodated in the fixing strip groove (4), and fits with the outer surface of the tip end (2).

[0046] Operate the angle knob and lifting forceps of the duodenoscope, determine from the duodenoscope image that the tip of the sheath (2) is aligned with the center of the duodenoscope papilla, then operate the sheath to advance and pass through the duodenal papilla into the common bile duct, and the size of the sheath at the papilla can be known from the duodenoscope image, thereby determining the length of the sheath entering the common bile duct. At this time, the proximal end of the sheath fixing strip (3) is stretched open due to elasticity and fixes the sheath in the common bile duct.

[0047] At this time, the duodenoscope can be operated to be withdrawn outside the body along the sheath tube of the present invention.

[0048] The doctor begins to insert the tip (2) of the choledochoscope into the sheath tube, and inserts the choledochoscope into the common bile duct along the inner wall of the sheath tube. The doctor can operate the choledochoscope to observe and treat the bile duct and pancreatic duct. At this time, the choledochoscope does not need to be tied to the handle of the duodenoscope or held by an assistant, but the choledochoscope can be operated independently in the human body through the sheath tube.

[0049] After the doctor has finished the diagnosis and treatment work using the choledochoscopic sub-scope, the doctor holds the choledochoscopic sub-scope in one hand and the sheath in the other hand, so that the choledochoscopic sub-scope and the sheath can be withdrawn from the patient's body together.

[0050] It should be noted that in the application documents of this patent, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements. In the application documents of this patent, if it is mentioned that an action is performed according to an element, it means that the action is performed at least according to the element, which includes two situations: performing the action only according to the element, and performing the action according to the element and other elements. Expressions such as multiple, multiple, and multiple include 2, 2 times, 2 kinds, and more than 2, more than 2 times, and more than 2 kinds.

[0051] All documents mentioned in this application are considered to be included in the disclosure of this application as a whole, so that they can be used as the basis for modification when necessary. In addition, it should be understood that after reading the above disclosure of this application, those skilled in the art can make various changes or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A sheath tube used for a choledochoscope, characterized in that: include: A sheath body (1), the sheath body (1) is tubular and configured to accommodate a choledochoscope; A tip portion (2) is disposed at the distal end of the sheath body (1), the distal end of the tip portion (2) being a flap-like structure configured to allow the choledochoscope to extend from the tip portion (2); and A sheath fixing strip (3), the distal end of which is connected to the outer surface of the tip portion (2), the sheath fixing strip (3) having a first state and a second state, the first state being configured to fit the outer surface of the tip portion (2) when the tip portion (2) is inside the duodenoscope, and the second state being configured to separate the proximal end of the sheath fixing strip (3) from the tip portion (2) and abut against the inner wall of the common bile duct when the tip portion (2) extends out of the duodenoscope.

2. The sheath tube for use in a choledochoscope according to claim 1, characterized in that: The tip portion (2) is a conical structure, and the diameter of the tip portion (2) gradually decreases from the proximal end of the tip portion (2) to the distal end of the tip portion (2).

3. The sheath tube for use in a choledochoscope according to claim 1, characterized in that: The front end portion (2) is provided with a fixing strip groove (4), and the fixing strip groove (4) is configured to accommodate the sheath tube fixing strip (3).

4. The sheath tube for use in a choledochoscope according to claim 1, characterized in that: The petal-like structure at the distal end of the tip portion (2) is configured to be closed in an initial state, and to have its edges separated and open in a working state.

5. The sheath tube for use in a choledochoscope according to claim 1, characterized in that: The distal end of the tip portion (2) is composed of 3 to 6 detachable petal-shaped pieces.

6. The sheath tube for use in a choledochoscope according to claim 1, characterized in that: The tube body of the sheath tube body (1) is composed of three layers of woven mesh tubes.

7. The sheath tube used for a choledochoscope according to claim 6, characterized in that: The middle layer of the three-layer woven mesh tube is a metal woven mesh tube, and the inner layer and the outer layer are composite material woven mesh tubes.

8. The sheath tube for use in a choledochoscope according to claim 1, characterized in that: The wall thickness of the sheath tube body (1) is 0.2 mm-0.3 mm.

9. The sheath tube for use in a choledochoscope according to claim 1, characterized in that: The length of the tip portion (2) is 10 mm to 12 mm.

10. The sheath tube for use in a choledochoscope according to claim 1, characterized in that: The outer surface of the tip portion (2) is provided with scale lines.

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