Patent Application
20220125448
The application relates to a stone extraction basket and a double lumen end cap for a stone extraction basket.
Endoscopic Retrograde Cholangio Pancreatography (ERCP) refers to the technique of inserting the duodenoscope into the descending part of the duodenum, finding the duodenal papilla, inserting the radiographic catheter into the opening part of the papilla through the biopsy tube, injecting contrast agent and then taking X-ray photograph to show the pancreatic duct. Because ERCP does not require invasive surgery, trauma is small, and operation time is short, the complications are less than invasive surgery, hospitalization time is greatly shortened, and the ERCP is widely welcomed by patients. The stone extraction basket is used as a common calculus removing tool in ERCP fittings for taking out biliary stone. The stone extraction basket is divided into a guide wire mesh basket, a guide wire-free mesh basket and an integrated calculus removing and crushing mesh basket. According to the shape of the mesh basket, the stone extraction basket can be divided into a hexagonal shape mesh basket, a diamond shape mesh basket and a spiral shape mesh basket.
In traditional ERCP, instrument exchange is performed through the reserved long guide wire (4.5 m) in the human body, which requires cooperation by doctors and nurses and requires a high degree of proficiency in the cooperation of doctors and nurses, and the operation time is long. In order to save the operation time and achieve single-person operation by the doctor, a set of surgical instruments that can cooperate with a short guide wire (2.6 m) to achieve rapid exchange between ERCP instruments have been developed for ERCP. At present, the conventional stone extraction basket cannot be rapidly exchanged in ERCP with a short guide wire because of the lack of guide wire lumen or a guide wire lumen channel being too long. The stone extraction basket cooperated with the short guide wire is still in a development stage, and, at present, there exist the problems that the inlet of the guide wire lumen is stressed, stretched and deformed, the guide wire is difficult to insert, the guide wire is driven by the distal end cap of the mesh basket to prevent the mesh basket from removing calculus and being withdrawn from biliary tracts and the like.
The disclosure provides a stone extraction basket, comprising a mesh basket, an outer tube and an operation portion, the mesh basket being connected to the operation portion, the operation portion controlling the mesh basket to move, a proximal end of the outer tube being connected to the operation portion, the outer tube axially extending from the proximal end to a distal end, the distal end of the outer tube being provided with a double lumen end cap, a guide wire passing through one lumen channel of the double lumen end cap, and the mesh basket passing through the other lumen channel of the double lumen end cap.
Optionally, the operation portion comprises a handle and a core rod, the handle sliding back and forth along the core rod to extend or retract the mesh basket.
Optionally, the double lumen end cap comprises a connection portion and a double lumen portion.
Optionally, the lumen channels of the double lumen end cap are hollow structures that together with the outer tube form a lumen channel through which the mesh basket is extended and retracted.
Optionally, an outer surface of one end of the connection portion has a spiral barb structure for connection with the outer tube, and an outer surface of the other end of the connection portion has a protrusion structure for connection with the double lumen portion.
Optionally, the protrusion structure has a groove structure around it.
Optionally, the protrusion structure is a quadrangle, hexagonal, or octagonal stop structure.
Optionally, the connection portion and the double lumen portion are connected in a plastic-coated mode, an adhesive mode or a shrinkage fit mode.
Optionally, a distal end surface of the double lumen end cap has a guide bevel structure on one side of the lumen channel through which the guide wire passes.
Optionally, an outer contour thickness of the lumen channel through which the mesh basket passes in the double lumen end cap is greater than an outer contour thickness of the lumen channel through which the guide wire passes.
The present disclosure further discloses a double lumen end cap for a stone extraction basket comprising a connection portion and a double lumen portion, wherein the double lumen portion comprises two lumen channels, a guide wire passes through one lumen channel of the double lumen portion, and the mesh basket passes through the other lumen channel of the double lumen portion.
Optionally, an outer surface of one end of the connection portion has a spiral barb structure and an outer surface of the other end of the connection portion has a protrusion structure.
Optionally, the protrusion structure has a groove structure around it.
Optionally, a distal end surface of the double lumen portion has a guide bevel structure on one side of the lumen channel through which the guide wire passes.
Optionally, an outer contour thickness of the lumen channel through which the mesh basket passes in the double lumen portion is greater than an outer contour thickness of the lumen channel through which the guide wire passes.
The connection portion and the double lumen portion can be made of stainless steel or medical polymer materials.
Due to the fact that organs such as a biliary tract of a human body and the like are not tubular structures with regular shapes, the diameter of the outer tube is relatively large, and parts such as a mesh basket are also arranged in the outer tube, the flexibility is relatively poor in the using process. The outer tube can easily deviate from a preset line when the outer tube is pushed at a bent position. In the stone extraction basket of the present disclosure, the distal end of the outer tube is provided with a double lumen end cap, and the double lumen end cap is close to an inner wall of the outer tube. In use, the guide wire may be pushed to a predetermined position using a sphincterotome. When the stone extraction basket is required to be used for calculus removing, the guide wire can pass through the guide wire lumen in advance. The guide wire is fixed, the outer tube is pushed, the outer tube moves along the guide wire, and the outer tube can move according to a preset line.
In order to more clearly illustrate the technical solution of the present disclosure, the drawings used in the embodiments will be briefly described below, and it would be possible for a person skilled in the art to obtain other drawings according to these drawings without involving any inventive effort.
For the purposes, technical solutions, and advantages of the present disclosure to become more fully apparent, the present disclosure would be further illustrated in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to be limiting thereof.
Hereinafter, an end close to the operator is defined as a proximal end, and an end far from the operator is defined as a distal end.
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In some embodiments of the present disclosure, the distal end surface of the double lumen end cap 5 has a guide bevel structure on one side of the lumen channel through which the guide wire 4 passes. The guide bevel is added to the distal end surface of the double lumen portion 9 of the double lumen end cap 5, so that the performance of the stone extraction basket passing through the duodenoscope can be improved. Therefore, interference between the double lumen end cap 5 and a forceps lifter at an outlet position at the distal end of the duodenoscope can be avoided. When a head end cap at the distal end of the catheter passes through the forceps lifter, the catheter can smoothly slide through the forceps lifter under the guiding effect of the bevel. In practice, if there is no guide bevel structure, the double lumen end cap 5 will first contact the forceps lifter through a lumen channel end surface of the guide wire to form a jam.
In addition, in practical use, an object taking operation is carried out after the stone extraction basket passes through the duodenoscope, so that the double lumen end cap 5 is likely to contact with an inner wall of tissues of organs such as biliary tracts or duodenums of a patient. Therefore, the guide bevel is increased on the distal end surface of the double lumen portion 9 of the double lumen end cap 5, the tissues can be dredged, the inner wall of the tissues is prevented from obstructing the action of the stone extraction basket, and the tissues are prevented from being injured due to the scratching by the end surface of the double lumen end cap 5.
In some embodiments of the present disclosure, an outer contour thickness of the lumen channel through which the mesh basket passes in the double lumen portion is greater than an outer contour thickness of the lumen channel through which the guide wire passes. In actual use, typically, a dimension of the part of the endoscopic instruments inserted into the human body is expressed in french, i.e., the circumference of the cross-section of the inserted part of the instruments. Because the natural lumen channel of the human body is in irregular peristalsis, when an instrument with a special-shaped cross section is inserted into the natural lumen channel of the human body, the smaller the circumference of the cross section, the better the insertion performance. The insertion performance of an instrument is a very important indicator for evaluating the performance of the instrument. Many times, very small channels in the human body, such as papilla openings, require smaller french and better insertion performance of the instrument to facilitate insertion and subsequent surgical procedures. Therefore, since the outer contour thickness of the lumen channel through which the mesh basket passes in the double lumen end cap is greater than the outer contour thickness of the lumen channel through which the guide wire passes, the dimension of the cross section of the catheter can be reduced as much as possible, better insertion performance is achieved, and the efficiency of inserting the stone extraction basket into the duodenal papilla is improved.
The foregoing is merely preferred embodiments of the present disclosure to enable a person skilled in the art to understand or practice the present disclosure. Various modifications and combinations of these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201821481534.0 | Sep 2018 | CN | national |
This application is a U.S. National Stage Entry under 35 U.S.C. § 371 of International Patent Application No. PCT/CN2019/104414, filed Sep. 4, 2019, entitled “CALCULUS REMOVING MESH BASKET AND DOUBLE-CAVITY END CAP FOR CALCULUS REMOVING MESH BASKET,” which application claims priority under 35 U.S.C. 119(b) and 37 CFR 1.55 to Chinese Patent Application No. 201821481534.0, filed Sep. 11, 2018, entitled “STONE EXTRACTION BASKET,” the entire disclosures of which are hereby incorporated by reference herein.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2019/104414 | 9/4/2019 | WO | 00 |
