CN209153778U - Endoscopic metal stent for local covered bile duct sampling - Google Patents
Endoscopic metal stent for local covered bile duct sampling Download PDFInfo
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- CN209153778U CN209153778U CN201821525215.5U CN201821525215U CN209153778U CN 209153778 U CN209153778 U CN 209153778U CN 201821525215 U CN201821525215 U CN 201821525215U CN 209153778 U CN209153778 U CN 209153778U
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 58
- 239000002184 metal Substances 0.000 title claims abstract description 58
- 210000000013 bile duct Anatomy 0.000 title claims abstract description 33
- 238000005070 sampling Methods 0.000 title abstract description 27
- 229910001000 nickel titanium Inorganic materials 0.000 claims abstract description 30
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- HLXZNVUGXRDIFK-UHFFFAOYSA-N nickel titanium Chemical compound [Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni] HLXZNVUGXRDIFK-UHFFFAOYSA-N 0.000 claims 6
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- 208000037804 stenosis Diseases 0.000 description 16
- 230000001575 pathological effect Effects 0.000 description 14
- 210000003445 biliary tract Anatomy 0.000 description 12
- 206010051341 Bile duct stenosis Diseases 0.000 description 9
- 210000003228 intrahepatic bile duct Anatomy 0.000 description 8
- 230000003902 lesion Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
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- 206010056375 Bile duct obstruction Diseases 0.000 description 3
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- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 3
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 3
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- 206010023129 Jaundice cholestatic Diseases 0.000 description 1
- 201000005267 Obstructive Jaundice Diseases 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
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Abstract
本实用新型涉及一种内镜下局部覆膜胆管取样金属支架，所述的金属支架包括头部定位端、尾部定位端、支架本体；所述的支架本体一端设置头部定位端，另一端设置尾部定位端；所述的支架本体采用镍钛合金丝编织而成，且镍钛合金丝编织成网格状；所述的头部定位端及尾部定位端的表面均覆有硅胶膜。其优点表现在：本实用新型为一种内镜下局部覆膜胆管取样金属支架，头尾两端的覆膜可避免肿瘤完全长入支架致使支架无法取出，中间的裸金属网格在固定支架位置的同时又可起取样的作用，无论是胆道良性狭窄，还是胆道恶性狭窄，本实用新型均适用，具有不易移位，不易阻塞，可取出，并能获取胆道病理标本等优点。
The utility model relates to a metal stent for sampling local bile duct under endoscope. The metal stent comprises a head positioning end, a tail positioning end and a stent body; one end of the stent body is provided with a head positioning end, and the other end is provided The tail positioning end; the stent body is woven with nickel-titanium alloy wire, and the nickel-titanium alloy wire is woven into a grid; the surfaces of the head positioning end and the tail positioning end are covered with silicone membranes. The advantages are as follows: the utility model is a metal stent for locally covered bile duct sampling under the endoscope. At the same time, it can also play the role of sampling. The utility model is applicable to both benign biliary strictures and malignant biliary strictures.
Description
技术领域technical field
本实用新型涉及医疗器械技术领域，具体地说，是一种内镜下局部覆膜胆管取样金属支架。The utility model relates to the technical field of medical devices, in particular to a metal stent for sampling local bile duct under endoscope.
背景技术Background technique
胆管狭窄是引起梗阻性黄疸的临床常见疾病之一，明确狭窄的病理性质是临床治疗和疾病预后的关键，但鉴别诊断十分困难，尤其是恶性胆管狭窄，早期症状常不典型，CT、MRI、MRCP等影像学检查检出率低，多数患者出现明显临床表现时已属中晚期，仅能行姑息治疗，预后极差。ERCP可显示肝内外胆管全貌，但仍属于影像学诊断，不能获取病理依据；近年来内镜下细胞刷检逐渐开展，但阳性率较低，对胆管狭窄定性诊断的敏感性、特异性及准确性均不高。此外，胆管腔狭窄的程度也相对影响病理活检的效果。对于狭窄明显的管腔，细胞刷等可发挥较强的组织取样作用；但对于狭窄程度较小的管腔，细胞刷等的取样作用则十分有限。Bile duct stenosis is one of the common clinical diseases that cause obstructive jaundice. Determining the pathological nature of the stenosis is the key to clinical treatment and disease prognosis, but the differential diagnosis is very difficult, especially malignant bile duct stenosis. Early symptoms are often atypical, CT, MRI, The detection rate of MRCP and other imaging examinations is low, and most patients are already in the middle and late stages when they have obvious clinical manifestations, and they can only receive palliative treatment, and the prognosis is extremely poor. ERCP can display the whole picture of intrahepatic and extrahepatic bile ducts, but it is still an imaging diagnosis and cannot obtain pathological evidence. In recent years, endoscopic cytological brushing has gradually been carried out, but the positive rate is low, and it is sensitive, specific and accurate for the qualitative diagnosis of bile duct strictures. Sex is not high. In addition, the degree of bile duct stenosis also relatively affects the effect of pathological biopsy. For the lumen with obvious stenosis, the cytobrush can play a strong role in tissue sampling; but for the lumen with less stenosis, the sampling effect of the cytobrush is very limited.
中国专利文献CN201210253580.6，申请日20120720，专利名称为：肝内胆管支架，公开了一种可以进入解决肝内胆管狭窄的肝内胆管支架，该肝内胆管支架，包括闭合时成线状、自由膨胀后成展开的网状中空支撑状的支架，所述支架为树枝状支架或倒L型支架或r状支架，分别用于肝内不同部位胆管的支撑。Chinese patent document CN201210253580.6, application date 20120720, patent name: intrahepatic bile duct stent, discloses an intrahepatic bile duct stent that can enter to solve intrahepatic bile duct stricture, the intrahepatic bile duct stent includes a linear, The stent is a stent in the form of a reticulated hollow support after free expansion. The stent is a dendritic stent or an inverted L-shaped stent or an r-shaped stent, which is respectively used for the support of bile ducts in different parts of the liver.
上述专利文献的肝内胆管支架，该支架根据肝内胆管的复杂生理解剖特性而设计成不同的形状结构，医生可以通过手术将捏合成最大外径为1mm的支架进入狭窄的肝内胆管，在外力撤销或者使用外力的情况下，支架恢复或者受力膨胀为直径为5mm的网状中空形状，撑开狭窄的胆管，恢复胆管的功能，从而达到治疗的目的。但是，关于一种内镜下胆管取样器材，利用金属网格对胆道内病灶进行切割取样送检病理，既可解决胆管梗阻，又可用于胆管狭窄组织细胞学检查(活检)的局部覆膜胆管取样的技术方案则未见相应的公开。The intrahepatic bile duct stent of the above-mentioned patent document is designed into different shapes and structures according to the complex physiological and anatomical characteristics of the intrahepatic bile duct. The doctor can knead a stent with a maximum outer diameter of 1 mm into the narrow intrahepatic bile duct through surgery. When the external force is removed or the external force is used, the stent is restored or expanded into a mesh-like hollow shape with a diameter of 5mm, which stretches the narrow bile duct and restores the function of the bile duct, so as to achieve the purpose of treatment. However, regarding an endoscopic bile duct sampling device, the metal grid is used to cut and sample the lesions in the bile duct for pathological examination, which can not only solve the bile duct obstruction, but also can be used for the local covered bile duct for histological examination (biopsy) of bile duct stricture. The technical scheme of sampling has not been disclosed accordingly.
综上所述，需要一种内镜下胆管取样器材，利用金属网格对胆道内病灶进行切割取样送检病理，既可解决胆管梗阻，又可用于胆管狭窄组织细胞学检查(活检)，而关于这种金属支架目前还未见报道。In summary, an endoscopic bile duct sampling device is needed, which uses metal grids to cut and sample the lesions in the bile duct for pathological examination, which can not only solve bile duct obstruction, but also be used for histological examination (biopsy) of bile duct strictures. There has been no report on this metal stent.
发明内容SUMMARY OF THE INVENTION
本实用新型的目的是针对现有技术中的不足，提供一种内镜下胆管取样器材，利用金属网格对胆道内病灶进行切割取样送检病理，既可解决胆管梗阻，又可用于胆管恶性狭窄组织细胞学检查(活检)。The purpose of the utility model is to aim at the deficiencies in the prior art and provide an endoscopic bile duct sampling device, which uses a metal grid to cut and sample the lesions in the bile duct for pathological examination, which can not only solve bile duct obstruction, but also be used for malignant bile duct Stenosis histology (biopsy).
为实现上述目的，本实用新型采取的技术方案是：For realizing the above-mentioned purpose, the technical scheme that the utility model takes is:
一种内镜下局部覆膜胆管取样金属支架，所述的金属支架包括头部定位端、尾部定位端、支架本体；所述的支架本体一端设置头部定位端，另一端设置尾部定位端；所述的支架本体采用镍钛合金丝编织而成，且镍钛合金丝编织成网格状；所述的头部定位端及尾部定位端的表面均覆有硅胶膜。A metal stent for partial film-covered bile duct sampling under endoscope, the metal stent comprises a head positioning end, a tail positioning end, and a stent body; one end of the stent body is provided with a head positioning end, and the other end is provided with a tail positioning end; The stent body is woven with nickel-titanium alloy wire, and the nickel-titanium alloy wire is woven into a grid; the surfaces of the head positioning end and the tail positioning end are covered with silicone membranes.
作为一种优选的技术方案，所述的支架本体包括右螺旋镍钛合金丝和左螺旋镍钛合金丝编织，右螺旋镍钛合金丝从头部定位端为初始位置，并从右侧方向螺旋分布编织到尾部定位端，左螺旋镍钛合金丝从头部定位端为初始位置，并从左侧方向螺旋分布编织到尾部定位端。As a preferred technical solution, the stent body comprises a right-helix nitinol wire and a left-helix nitinol wire braided, and the right-helix nitinol wire is the initial position from the positioning end of the head, and spirals from the right direction The distribution is braided to the tail positioning end, and the left helical nickel-titanium alloy wire starts from the head positioning end as the initial position, and is helically distributed and braided from the left direction to the tail positioning end.
作为一种优选的技术方案，所述金属支架总长为4-6cm。As a preferred technical solution, the total length of the metal stent is 4-6 cm.
作为一种优选的技术方案，所述的头部定位端和尾部定位端均占金属支架总长的1/5。As a preferred technical solution, the head positioning end and the tail positioning end both account for 1/5 of the total length of the metal bracket.
作为一种优选的技术方案，所述的支架本体占金属支架总长的3/5。As a preferred technical solution, the stent body accounts for 3/5 of the total length of the metal stent.
作为一种优选的技术方案，所述的支架本体整体呈圆柱状，支架本体内径在1-1.5cm。As a preferred technical solution, the stent body is cylindrical as a whole, and the inner diameter of the stent body is 1-1.5 cm.
作为一种优选的技术方案，所述的金属支架的尾部定位端附有6cm长的拉索。As a preferred technical solution, a 6 cm long cable is attached to the tail positioning end of the metal bracket.
作为一种优选的技术方案，所述的金属支架配套有推送器。As a preferred technical solution, the metal bracket is equipped with a pusher.
本实用新型优点在于：The utility model has the advantages of:
1、本实用新型的一种内镜下局部覆膜胆管取样金属支架，头尾两端的覆膜可避免肿瘤完全长入支架致使支架无法取出，中间的裸金属网格在固定支架位置的同时又可起取样的作用，无论是胆道良性狭窄，还是胆道恶性狭窄，本实用新型均适用，具有不易移位，不易阻塞，可取出，并能获取胆道病理标本等优点。而现有技术中的全覆膜金属支架常用于胆道良性狭窄，但存在容易移位且取不到病理的缺点。非覆膜金属支架常用于胆道恶性狭窄，置入后存在胆道新生组织长入支架致支架无法取出的缺点，且同样无法取得病理标本。而且在明确胆道狭窄病变性质之前，在两种支架的选择上存在难题。1. A metal stent for sampling bile duct under endoscope with local coating of the present utility model, the coating at both ends of the head and tail can prevent the tumor from completely growing into the stent and the stent cannot be taken out. The utility model can be used for sampling, whether it is benign stenosis of biliary tract or malignant stenosis of biliary tract, the utility model has the advantages of not easy to shift, not easy to block, can be taken out, and can obtain pathological specimens of biliary tract. However, the fully covered metal stent in the prior art is often used for benign biliary strictures, but has the disadvantage of easy displacement and no pathology. Non-covered metal stents are often used for malignant biliary strictures. After implantation, there is a disadvantage that the new tissue of the biliary duct grows into the stent and the stent cannot be removed, and pathological specimens cannot be obtained. Moreover, there are difficulties in the choice of the two stents before the nature of biliary strictures is clarified.
2、支架本体采用镍钛合金丝编织而成，即采用镍钛合金作为支架材料，镍钛合金是一种形状记忆合金，变形以后在某一特定温度下可自动恢复为原始形状，具有超弹性性能，其耐腐蚀、耐磨损的性能优于目前最好的医用不锈钢，可以满足功能性支架对材料的基本需求。2. The stent body is woven with nickel-titanium alloy wire, that is, nickel-titanium alloy is used as the stent material. Nickel-titanium alloy is a shape memory alloy. After deformation, it can automatically return to its original shape at a certain temperature and has super elasticity. Its corrosion resistance and wear resistance are better than the best medical stainless steel at present, which can meet the basic requirements of functional stents for materials.
3、支架本体一端设置头部定位端，另一端设置尾部定位端；所述的头部定位端及尾部定位端的表面均覆有硅胶膜，而支架本体上无硅胶膜，即实施胆道取样的部分，表面不覆盖硅胶膜，呈裸露的金属网格。头部定位端和尾部定位端可避免胆道新生组织长入支架，支架本体可允许胆道新生组织长入金属支架的网格内，长入金属支架网格内的新生组织，在金属支架取出时可被同时切割下来，进而送检病理，从而明确病变性质。3. One end of the stent body is provided with a head positioning end, and the other end is provided with a tail positioning end; the surfaces of the head positioning end and the tail positioning end are covered with silicone membranes, while there is no silicone membrane on the stent body, that is, the part where biliary sampling is performed , the surface is not covered with silicone film, and it is a bare metal grid. The head positioning end and the tail positioning end can prevent the new tissue of the biliary tract from growing into the stent, the stent body can allow the new tissue of the biliary tract to grow into the grid of the metal stent, and the new tissue growing into the grid of the metal stent can be removed when the metal stent is taken out. It was cut at the same time, and then sent for pathological examination, so as to clarify the nature of the lesions.
4、金属支架总长4～6cm，可根据狭窄段长短选择支架长短，支架可整个放入胆道；支架本体的内径在1-1.5cm，可根据胆道不同的狭窄程度选择不同内径的支架。4. The total length of the metal stent is 4-6cm, the length of the stent can be selected according to the length of the stenosis, and the stent can be placed in the biliary duct as a whole; the inner diameter of the stent body is 1-1.5cm, and stents with different inner diameters can be selected according to the different degrees of stenosis of the biliary tract.
附图说明Description of drawings
附图1是本实用新型的一种内镜下局部覆膜胆管取样金属支架结构示意图。FIG. 1 is a schematic structural diagram of a metal stent for sampling local covered bile duct under endoscope according to the present invention.
附图2是本实用新型的一种内镜下局部覆膜胆管取样金属支架的使用方法流程示意图。FIG. 2 is a schematic flow chart of a method of using a metal stent for sampling a partially covered bile duct under an endoscope according to the present invention.
具体实施方式Detailed ways
下面结合附图对本实用新型提供的具体实施方式作详细说明。The specific embodiments provided by the present utility model will be described in detail below with reference to the accompanying drawings.
附图中涉及的附图标记和组成部分如下所示：The reference numerals and components involved in the drawings are as follows:
1.头部定位端 2.支架本体1. Head positioning end 2. Bracket body
3.尾部定位端3. Tail positioning end
请参照图1，图1是本实用新型的一种内镜下局部覆膜胆管取样金属支架结构示意图。所述的金属支架包括头部定位端1、尾部定位端3、支架本体2；所述的支架本体2一端设置头部定位端1，另一端设置尾部定位端3；所述的支架本体2采用镍钛合金丝编织而成，且镍钛合金丝编织成网格状，作为一种优选，所述的支架本体2包括右螺旋镍钛合金丝和左螺旋镍钛合金丝编织，右螺旋镍钛合金丝从头部定位端1为初始位置，并从右侧方向螺旋分布编织到尾部定位端3，左螺旋镍钛合金丝从头部定位端1为初始位置，并从左侧方向螺旋分布编织到尾部定位端3。Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of a metal stent for partially covered bile duct sampling under endoscope according to the present invention. The metal bracket includes a head positioning end 1, a tail positioning end 3, and a bracket body 2; one end of the bracket body 2 is provided with a head positioning end 1, and the other end is provided with a tail positioning end 3; the bracket body 2 adopts Nickel-titanium alloy wire is woven, and the nickel-titanium alloy wire is woven into a grid shape. As a preference, the stent body 2 includes a right-helix nickel-titanium alloy wire and a left-helix nickel-titanium alloy wire woven, and a right-helix nickel-titanium alloy wire is woven. The alloy wire starts from the head positioning end 1 as the initial position, and is helically woven from the right direction to the tail positioning end 3, and the left-helix nickel-titanium alloy wire starts from the head positioning end 1 as the initial position, and is helically distributed and woven from the left direction. To the tail positioning end 3.
所述的头部定位端1及尾部定位端3的表面均覆有硅胶膜；所述金属支架总长为4-6cm；所述的头部定位端1和尾部定位端3均占金属支架总长的1/5；所述的支架本体占金属支架总长的3/5。The surfaces of the head positioning end 1 and the tail positioning end 3 are covered with a silicone film; the total length of the metal bracket is 4-6 cm; 1/5; the bracket body accounts for 3/5 of the total length of the metal bracket.
所述的支架本体2整体呈圆柱状，支架本体2内径在1-1.5cm。The bracket body 2 is cylindrical as a whole, and the inner diameter of the bracket body 2 is 1-1.5 cm.
需要说明的是：It should be noted:
支架本体2采用镍钛合金丝编织而成，即采用镍钛合金作为支架材料，镍钛合金是一种形状记忆合金，变形以后在某一特定温度下可自动恢复为原始形状，具有超弹性性能，其耐腐蚀、耐磨损的性能优于目前最好的医用不锈钢，可以满足功能性支架对材料的基本需求。The stent body 2 is woven from nickel-titanium alloy wire, that is, nickel-titanium alloy is used as the stent material. Nickel-titanium alloy is a shape memory alloy, which can automatically return to its original shape at a certain temperature after deformation, and has superelastic properties , its corrosion resistance and wear resistance are better than the current best medical stainless steel, which can meet the basic requirements of functional stents for materials.
所述的金属支架总长4～6cm，可根据狭窄段长短选择支架长短，支架可整个放入胆道。The total length of the metal stent is 4-6 cm, the length of the stent can be selected according to the length of the stenosis section, and the stent can be put into the biliary tract as a whole.
所述的支架本体2的内径在1-1.5cm，可根据胆道不同的狭窄程度选择不同内径的支架。The inner diameter of the stent body 2 is 1-1.5 cm, and stents with different inner diameters can be selected according to different stenosis degrees of the biliary tract.
所述的支架本体2一端设置头部定位端1，另一端设置尾部定位端3；所述的头部定位端1及尾部定位端3的表面均覆有硅胶膜，而支架本体2上无硅胶膜，即实施胆道取样的部分，表面不覆盖硅胶膜，呈裸露的金属网格。头部定位端1和尾部定位端3可避免胆道新生组织长入支架，支架本体2可允许胆道新生组织长入金属支架的网格内。One end of the bracket body 2 is provided with a head positioning end 1, and the other end is provided with a tail positioning end 3; the surfaces of the head positioning end 1 and the tail positioning end 3 are covered with a silicone film, and the bracket body 2 has no silicone The membrane, that is, the part where biliary sampling is performed, is not covered with a silicone membrane and is a bare metal grid. The head locating end 1 and the tail locating end 3 can prevent biliary new tissue from growing into the stent, and the stent body 2 can allow biliary duct new tissue to grow into the grid of the metal stent.
所述的支架本体2包括右螺旋镍钛合金丝和左螺旋镍钛合金丝编织，右螺旋镍钛合金丝从头部定位端1为初始位置，并从右侧方向螺旋分布编织到尾部定位端3，左螺旋镍钛合金丝从头部定位端1为初始位置，并从左侧方向螺旋分布编织到尾部定位端3。该设计方式的作用是：使得支架本体2能够形成空间立体状的网格，在取样时不容易脱落，使得胆管狭窄定性诊断敏感性、特异性及准确性高；同时，有助于建立稳定的管状结构，可在狭窄程度较小的管腔中，发挥较强的组织取样作用。The stent body 2 includes a right-helix nickel-titanium alloy wire and a left-helix nickel-titanium alloy wire braided, and the right-helix nickel-titanium alloy wire is woven from the head positioning end 1 as the initial position, and is helically distributed from the right direction to the tail positioning end. 3. The left-spiral nickel-titanium alloy wire starts from the head positioning end 1 as the initial position, and is helically woven from the left direction to the tail positioning end 3. The function of this design method is: the stent body 2 can form a spatial three-dimensional grid, which is not easy to fall off during sampling, so that the sensitivity, specificity and accuracy of the qualitative diagnosis of bile duct stenosis are high; at the same time, it is helpful to establish a stable The tubular structure can play a strong role in tissue sampling in the lumen with less stenosis.
作为一种优选，金属支架通过配套的推送器送入胆道狭窄处后，可起解除胆道梗阻的作用。金属支架在人体内放置一定时间后，随着肿瘤生长或增生组织的反应性生长(即新生组织)，新生组织可经支架中间段网眼长入胆道。根据国内外报道，金属支架在胆道恶性狭窄中的平均通畅期为300天左右。为了避免肿瘤完全堵死支架致使支架无法取出，又为了保证能有足够的组织长入金属支架网眼且能轻易取出，不造成组织的严重损伤，将支架的放置时间定在1个月至3个月之间。As a preferred option, after the metal stent is sent into the biliary stenosis through a matching pusher, it can relieve biliary obstruction. After the metal stent is placed in the human body for a certain period of time, with the growth of tumor or the reactive growth of hyperplastic tissue (ie, new tissue), the new tissue can grow into the bile duct through the mesh in the middle section of the stent. According to domestic and foreign reports, the average patency period of metal stents in malignant biliary strictures is about 300 days. In order to prevent the stent from being completely blocked by the tumor so that the stent cannot be removed, and to ensure that enough tissue can grow into the mesh of the metal stent and can be easily removed without causing serious tissue damage, the stent placement time is set at 1 month to 3 between months.
作为一种优选，金属支架的尾部定位端3附有6cm长的拉索，金属支架取出时只需牵拉留在乳头外的拉索即可。As a preference, a 6 cm long cable is attached to the tail positioning end 3 of the metal stent, and only the cable left outside the nipple can be pulled when the metal stent is taken out.
本实用新型的金属支架，使用状态下，长入金属支架网格内的新生组织，在金属支架取出时可被同时切割下来，进而送检病理，从而明确病变性质。In the metal stent of the utility model, in the use state, the new tissue growing into the grid of the metal stent can be simultaneously cut off when the metal stent is taken out, and then sent for pathological examination, so as to clarify the nature of the lesion.
请参照图2，图2是本实用新型的一种内镜下局部覆膜胆管取样金属支架的使用方法流程示意图。本实用新型的一种内镜下局部覆膜胆管取样金属支架的使用方法是：1，选择胆总管狭窄病变；2，局部覆膜胆管取样金属支架置入胆管狭窄处，解除胆道梗阻；3，支架放置1-3个月后，新生组织张入支架中间段金属网格内；随支架一并取出的新生组织，进而送检病理。Please refer to FIG. 2 . FIG. 2 is a schematic flow chart of a method of using a metal stent for sampling a partially covered bile duct under an endoscope according to the present invention. A method of using a metal stent for local covered bile duct sampling under the endoscope of the present utility model is as follows: 1, selecting the stenotic lesions of the common bile duct; 2, placing the local covered bile duct sampling metal stent in the stenosis of the bile duct to relieve biliary obstruction; 3, After the stent is placed for 1-3 months, the new tissue is stretched into the metal grid in the middle section of the stent; the new tissue taken out together with the stent is sent for pathological examination.
本实用新型的一种内镜下局部覆膜胆管取样金属支架，头尾两端的覆膜可避免肿瘤完全长入支架致使支架无法取出，中间的裸金属网格在固定支架位置的同时又可起取样的作用，无论是胆道良性狭窄，还是胆道恶性狭窄，本实用新型均适用，具有不易移位，不易阻塞，可取出，并能获取胆道病理标本等优点，而现有技术中的全覆膜金属支架常用于胆道良性狭窄，但存在容易移位且取不到病理的缺点。非覆膜金属支架常用于胆道恶性狭窄，置入后存在胆道新生组织长入支架致支架无法取出的缺点，且同样无法取得病理标本。而且在明确胆道狭窄病变性质之前，在两种支架的选择上存在难题。支架本体2采用镍钛合金丝编织而成，即采用镍钛合金作为支架材料，镍钛合金是一种形状记忆合金，变形以后在某一特定温度下可自动恢复为原始形状，具有超弹性性能，其耐腐蚀、耐磨损的性能优于目前最好的医用不锈钢，可以满足功能性支架对材料的基本需求。支架本体2一端设置头部定位端1，另一端设置尾部定位端3；所述的头部定位端1及尾部定位端3的表面均覆有硅胶膜，而支架本体2上无硅胶膜，即实施胆道取样的部分，表面不覆盖硅胶膜，呈裸露的金属网格。头部定位端1和尾部定位端3可避免胆道新生组织长入支架，支架本体2可允许胆道新生组织长入金属支架的网格内，长入金属支架网格内的新生组织，在金属支架取出时可被同时切割下来，进而送检病理，从而明确病变性质。金属支架总长4～6cm，可根据狭窄段长短选择支架长短，支架可整个放入胆道；支架本体2的内径在1-1.5cm，可根据胆道不同的狭窄程度选择不同内径的支架。The utility model relates to a metal stent for local bile duct sampling under endoscope. The coating at both ends of the head and tail can prevent the tumor from completely growing into the stent so that the stent cannot be taken out, and the bare metal grid in the middle can fix the position of the stent and at the same time The function of sampling, whether it is a benign stenosis of the biliary tract or a malignant stenosis of the biliary tract, the utility model is applicable, and has the advantages of being difficult to displace, not easy to block, can be taken out, and can obtain pathological specimens of the biliary tract. Metal stents are often used for benign biliary strictures, but they have the disadvantages of easy displacement and no pathology. Non-covered metal stents are often used for malignant biliary strictures. After implantation, there is a disadvantage that the new tissue of the biliary duct grows into the stent and the stent cannot be removed, and pathological specimens cannot be obtained. Moreover, there are difficulties in the choice of the two stents before the nature of biliary strictures is clarified. The stent body 2 is woven from nickel-titanium alloy wire, that is, nickel-titanium alloy is used as the stent material. Nickel-titanium alloy is a shape memory alloy, which can automatically return to its original shape at a certain temperature after deformation, and has superelastic properties , its corrosion resistance and wear resistance are better than the current best medical stainless steel, which can meet the basic requirements of functional stents for materials. One end of the bracket body 2 is provided with a head positioning end 1, and the other end is provided with a tail positioning end 3; the surfaces of the head positioning end 1 and the tail positioning end 3 are covered with silicone membranes, while the bracket body 2 has no silicone membrane, that is, The part where biliary sampling is performed is not covered with a silicone membrane and is a bare metal grid. The head positioning end 1 and the tail positioning end 3 can prevent the new tissue of the biliary duct from growing into the stent, and the stent body 2 can allow the new tissue of the biliary duct to grow into the grid of the metal stent, and the new tissue that grows into the grid of the metal stent will not grow into the metal stent. When taken out, it can be cut at the same time, and then sent for pathological examination, so as to clarify the nature of the lesion. The total length of the metal stent is 4-6 cm, and the length of the stent can be selected according to the length of the stenosis, and the stent can be placed in the biliary duct as a whole; the inner diameter of the stent body 2 is 1-1.5 cm, and stents with different inner diameters can be selected according to the different degrees of stenosis of the biliary tract.
以上所述仅是本实用新型的优选实施方式，应当指出，对于本技术领域的普通技术人员，在不脱离本实用新型方法的前提下，还可以做出若干改进和补充，这些改进和补充也应视为本实用新型的保护范围。The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the method of the present invention, several improvements and supplements can be made. These improvements and supplements are also It should be regarded as the protection scope of the present invention.
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