CN213048568U - Novel implanted blood drainage tube for hemodialysis - Google Patents
Novel implanted blood drainage tube for hemodialysis Download PDFInfo
- Publication number
- CN213048568U CN213048568U CN202020804595.7U CN202020804595U CN213048568U CN 213048568 U CN213048568 U CN 213048568U CN 202020804595 U CN202020804595 U CN 202020804595U CN 213048568 U CN213048568 U CN 213048568U
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- drainage tube
- face
- cloth
- arc
- magic
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- 239000008280 blood Substances 0.000 title claims abstract description 23
- 210000004369 blood Anatomy 0.000 title claims abstract description 23
- 238000001631 haemodialysis Methods 0.000 title claims abstract description 21
- 230000000322 hemodialysis Effects 0.000 title claims abstract description 21
- 239000004744 fabric Substances 0.000 claims abstract description 55
- 239000010410 layer Substances 0.000 claims abstract description 42
- 229920000742 Cotton Polymers 0.000 claims abstract description 33
- 238000002513 implantation Methods 0.000 claims abstract description 13
- 239000012790 adhesive layer Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000007943 implant Substances 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims 2
- 239000011521 glass Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000012216 screening Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 230000006872 improvement Effects 0.000 description 4
- 239000004922 lacquer Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 206010052428 Wound Diseases 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 229920006351 engineering plastic Polymers 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000007460 surgical drainage Methods 0.000 description 2
- 206010067268 Post procedural infection Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 210000003445 biliary tract Anatomy 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000000115 thoracic cavity Anatomy 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 230000029663 wound healing Effects 0.000 description 1
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Abstract
The utility model discloses an implanted novel blood drainage tube for hemodialysis, which comprises a drainage tube body and an implantation head, the utility model arranges a positioning structure outside the drainage tube body, the arc-shaped clamping plate at the front end is driven by the connecting cloth to be placed at the front end of the drainage tube body, and the position of the connecting cloth is adjusted, then the positioning cloth moves the magic tape cotton layer to be attached on the magic tape adhesive layer, at the moment, the inserting piece is pulled to wind the arm of the patient for a circle to be inserted into the inner side of the slot plate, and the hollow clamping block is deformed under pressure in the process of inserting, after the inserting sheet is completely inserted into the slot plate, the hollow clamping block elastically deforms and enters the clamping groove on the inner side of the slot plate, thereby realize the fixed to the drainage tube position, rotate arc screening glass simultaneously and drive the opening and protect drainage tube and implantation head department, reached the stable fixed to the drainage tube position to prevent that external acting force from making the painful beneficial effect of patient.
Description
Technical Field
The utility model relates to a drainage tube field of being correlated with specifically is a novel blood drainage tube of implanted for hemodialysis.
Background
The clinical surgical drainage tubes are used for catheterization, wounds, thoracic cavities, brain cavities, gastrointestinal tracts, biliary tracts and the like, the surgical drainage tubes are used for guiding pus, blood and liquid accumulated in human tissues or body cavities to the outside of a body to prevent postoperative infection and influence on wound healing, and the drainage tubes used for hemodialysis are mostly arranged on arm parts and are used in an implantation mode.
When the drainage tube is in use, in order to prevent the drainage tube from falling off, the drainage tube is usually fixed at a proper position by using an adhesive tape, the stability of the adhesive tape is low, and a patient easily touches the drainage tube carelessly in the use process, thereby causing certain pain.
SUMMERY OF THE UTILITY MODEL
Therefore, in order to solve the above insufficiency, the utility model provides a novel blood drainage tube of implanted type for hemodialysis here.
The utility model is realized by constructing an implanted novel blood drainage tube for hemodialysis, which comprises a drainage tube body, an implantation head and a positioning structure, wherein the implantation head is fastened at the right end of the drainage tube body, the left end of the inner side of the drainage tube body is tightly attached to the right end of the outer side of a sealing plug, the positioning structure is arranged at the right end of the outer side of the drainage tube body and consists of positioning cloth, elastic pieces, insertion pieces, a slot plate, a hollow clamping block, a protection structure, a connecting cloth piece, a magic tape adhesive layer, a magic tape cotton layer, an arc-shaped clamping plate and an anti-slip rubber piece, two elastic pieces are symmetrically embedded at the upper end and the lower end of the rear end surface of the positioning cloth, the insertion pieces and the slot plate are respectively fastened at the upper end and the lower end of the positioning cloth, the insertion pieces movably extend into the inner side of the slot plate, the hollow clamping block is fastened at the top end of, protection architecture sets up in location cloth rear end face middle part, it sets up in location cloth front end middle part to connect the cloth, the fastening of facade mid-portion symmetry has arc splint around the connection cloth, the magic is pasted the adhesive layer and is sewed up in connecting the cloth rear end face, the magic is pasted cotton layer and is sewed up in location cloth front end face middle part, and the magic is pasted cotton layer and is hugged closely in the magic and paste the adhesive layer rear end face, the arc splint cover right-hand member in the drainage body outside, and the inboard of arc splint paste has the anti-skidding sheet rubber, the anti-skidding sheet rubber is laminated in a class body surface.
Preferably, protection architecture detains by arc screening glass, opening, extension board and rotation and constitutes, the mouth is seted up in arc screening glass preceding terminal surface left end face, and opening medial surface covers in drainage tube body and implantation head outside end face with clearance fit's mode, extension board structure as an organic whole sets up in arc screening glass right-hand member face, and the extension board detains through rotating to be connected with location cloth rear end face middle part rotation.
Preferably, the front end face of the connecting cloth piece is provided with a flexible cotton layer, and the thickness of the cotton layer is 0.2 cm.
Preferably, the front end of the outer side of the hollow clamping block is in a tapered shape gradually reduced from back to front, and the front end of the top end face of the hollow clamping block is connected with the top end face of the inserting piece.
Preferably, the magic is pasted the layer and is pasted the cotton layer outside of magic and be square form, and the magic is pasted the layer and is pasted cotton layer side surface mutually and flush with the magic.
Preferably, the arc splint are semicircle-shaped appearance, and two arc splint enclose to close and form hollow tubulose.
Preferably, the outer surface of the anti-skid rubber sheet is provided with anti-skid convex points, and more than two anti-skid convex points are arranged on the outer surface of the anti-skid rubber sheet at equal intervals.
Preferably, the arc protection piece is provided with anti-skidding lacquer with the rotation knot junction, and anti-skidding lacquer is rough surface.
Preferably, the hollow clamping block is made of silica gel.
Preferably, the arc protection plate is made of engineering plastics.
The utility model has the advantages of as follows: the utility model discloses an improve and provide a novel blood drainage tube of implanted formula for hemodialysis here, compare with equipment of the same type, have following improvement:
the method has the advantages that: the utility model relates to an implanted novel blood drainage tube for hemodialysis, which is characterized in that a positioning structure is arranged at the outer side of a drainage tube body, the front end of the drainage tube body is placed by an arc-shaped splint of a connecting cloth piece driving front end, the position of the connecting cloth piece is adjusted, then a positioning cloth driving magic paste cotton layer is laminated on a magic paste adhesive layer, and the arc-shaped splint of the rear end is laminated at the rear end of the drainage tube body, at the moment, an inserting piece is pulled to be wound around the arm of a patient for a circle and inserted into the inner side of a slot plate, and a hollow clamping block is deformed by pressure in the inserting process, when the inserting piece is completely inserted into the slot plate, the elastic deformation of the hollow clamping block enters into a clamping groove at the inner side of the slot plate, thereby realizing the fixation of the drainage tube position, simultaneously, rotating an arc-shaped protection plate opening to protect the drainage tube and an, and the beneficial effect of preventing external force from causing pain to the patient.
The method has the advantages that: a novel blood drainage tube of implanted for hemodialysis, the utility model discloses a magic is pasted the adhesion coating and is pasted the cotton layer outside of magic and be square form, and the magic is pasted adhesion coating and magic and is pasted cotton layer side surface and flush mutually for it is more stable to paste adhesion coating and magic and paste cotton layer connection to cross the magic.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the positioning structure of the present invention;
fig. 3 is an enlarged schematic view of the structure at a in fig. 2 according to the present invention;
FIG. 4 is a schematic view of the connection structure of the arc-shaped splint of the present invention;
fig. 5 is a schematic diagram of the protection structure of the present invention.
Wherein: drainage tube body-1, implantation head-2, sealing plug-3, positioning structure-4, positioning cloth-41, elastic sheet-42, inserting sheet-43, slot plate-44, hollow clamping block-45, protection structure-46, connecting cloth-47, magic tape adhesive layer-48, magic tape cotton layer-49, arc splint-410, anti-skid rubber sheet-411, arc protection sheet-
461. Opening-462, extension plate-463 and rotary buckle-464.
Detailed Description
The present invention will be described in detail with reference to the accompanying fig. 1-5, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a novel implantable blood drainage tube for hemodialysis through improvement, which comprises a drainage tube body 1, an implantation head 2 and a positioning structure 4, wherein the implantation head 2 is fastened at the right end of the drainage tube body 1, the left end of the inner side of the drainage tube body 1 is tightly attached to the right end of the outer side of a sealing plug 3, the positioning structure 4 is arranged at the right end of the outer side of the drainage tube body 1, the positioning structure 4 consists of a positioning cloth 41, an elastic sheet 42, an insertion sheet 43, a slot plate 44, a hollow clamping block 45, a protection structure 46, a connecting cloth 47, a magic tape adhesive layer 48, a magic tape cotton layer 49, an arc-shaped clamping plate 410 and an anti-slip rubber sheet 411, two elastic sheets 42 are symmetrically embedded at the upper end and the lower end of the rear end face of the positioning cloth 41, so that the positioning cloth 41 can be conveniently pulled to cover the arm of a patient, the insertion sheet 43 and the slot, and the top end face of the inserting sheet 43 is fastened with a hollow clamping block 45, the hollow clamping block 45 is fitted inside the clamping groove formed in the inner side of the slot plate 44, so that the inserting sheet 43 and the slot plate 44 are fixedly connected, the protection structure 46 is arranged in the middle of the rear end face of the positioning cloth 41, the connecting cloth piece 47 is arranged in the middle of the front end of the positioning cloth 41, arc-shaped clamping plates 410 are symmetrically fastened in the middle of the front and rear opposite faces of the connecting cloth piece 47, the magic tape adhesive layer 48 is sewn on the rear end face of the connecting cloth piece 47, the magic tape cotton layer 49 is sewn on the middle of the front end face of the positioning cloth 41, the magic tape cotton layer 49 is tightly attached to the rear end face of the magic tape adhesive layer 48, so that the positioning cloth 41 and the connecting cloth piece 47 are fixedly connected, the arc-shaped clamping plates 410 cover the middle and right ends of the outer side of.
Further, protection architecture 46 comprises arc protection piece 461, opening 462, extension board 463 and rotation buckle 464, opening 462 sets up in arc protection piece 461 front end face left end face, and opening 462 medial extremity covers drainage tube body 1 and implants head 2 outside end face with clearance fit's mode, is convenient for protect drainage tube body 1 and implants head 2, extension board 463 sets up in arc protection piece 461 right end face for integrated structure, and extension board 463 is detained 464 through rotating and is connected with location cloth 41 rear end face middle part rotation.
Furthermore, the front end face of the connecting cloth piece 47 is provided with a flexible cotton layer, the thickness of the cotton layer is 0.2cm, and the comfort of the connecting cloth piece 47 contacting a patient is improved.
Further, the front end of the outer side of the hollow clamping block 45 is in a tapered shape from back to front, and the front end of the top end face of the hollow clamping block 45 is connected to the top end face of the insertion piece 43, so that the hollow clamping block 45 is deformed under pressure.
Further, the magic is pasted the layer 48 and is pasted the cotton layer 49 outside of magic and be square form, and the magic is pasted the layer 48 and is pasted the cotton layer 49 side surface of magic and flush mutually for the magic is pasted the layer 48 and is pasted the cotton layer 49 with the magic and connect more stably.
Further, the arc splint 410 is a semicircle shape, and the two arc splints 410 enclose to form a hollow tube shape, so that the arc splint 410 is more stably clamped on the outer surface of the drainage tube body 1.
Further, the outer surface of the anti-skid rubber sheet 411 is provided with anti-skid convex points, and the anti-skid convex points are arranged on the outer surface of the anti-skid rubber sheet 411 at equal intervals, so that the anti-skid rubber sheet 411 is prevented from sliding.
Further, arc protection piece 461 and rotation buckle 464 junction are provided with anti-skidding lacquer, and anti-skidding lacquer is rough surface, prevents to make arc protection piece 461 rotate at will.
Further, the hollow fixture block 45 is made of silica gel, so that the hollow fixture block 45 is more easily deformed under the action of external force.
Further, arc protection piece 461 is made of engineering plastics, and is high in hardness and not easy to damage.
The utility model provides an implanted novel blood drainage tube for hemodialysis through improvement, and the working principle is as follows;
firstly, the drainage tube is taken out to a designated position, the sealing plug 3 can effectively prevent blood from flowing outwards, when the drainage tube needs to be used, the sealing plug 3 can be firstly taken down from the drainage tube body 1, the drainage tube body 1 is connected to the designated position of external designated equipment, and the implantation head 2 is connected to the designated position;
secondly, the front end of the drainage tube body 1 can be placed by the arc-shaped splint 410 with the front end driven by the connecting cloth piece 47, the positions of the connecting cloth piece 47 and the arc-shaped splint 410 are adjusted, then the positioning cloth 41 drives the magic tape cotton layer 49 to be attached to the magic tape adhesive layer 48, and the positioning cloth 41 drives the arc-shaped splint 410 with the rear end to be attached to the rear end of the drainage tube body 1, thereby realizing the contact between the front and rear end surfaces of the front and rear arc-shaped splints 410 to realize the sealing protection of the drainage tube body 1, at the moment, the inserting piece 43 is pulled to drive the positioning cloth 41 to wind the arm of the patient for a circle to be inserted into the inner side of the slot plate 44, at the moment, the elastic piece 42 is stretched by the pulling force, and the hollow fixture block 45 is deformed by the pressure in the process that the inserting piece 43 is inserted into the inner side of the slot plate 44, when the inserting piece 43 is completely inserted into, meanwhile, the arc-shaped protection plate 461 is rotated to drive the opening 462 to protect the drainage tube 1 and the implantation head 2;
thirdly, after the whole drainage tube is fixedly installed, blood can be conveyed and drained through the drainage tube.
The utility model provides a novel implantable blood drainage tube for hemodialysis through improvement, the arc splint 410 which is connected with the cloth piece 47 and drives the front end is placed at the front end of the drainage tube body 1, the positions of the connection cloth piece 47 and the arc splint 410 are adjusted, then the positioning cloth 41 drives the magic paste cotton layer 49 to be pasted on the magic paste adhesive layer 48, and the positioning cloth 41 drives the arc splint 410 at the rear end to be pasted at the rear end of the drainage tube body 1, thereby realizing the contact of the front end surface and the rear end surface of the front arc splint 410 and the rear arc splint 410 and realizing the sealing protection of the drainage tube body 1, at the moment, the inserting piece 43 is pulled to drive the positioning cloth 41 to wind the arm of a patient for a circle and insert into the inner side of the slot plate 44, at the moment, the elastic piece 42 is stretched by the pulling force, and the hollow fixture block 45 is deformed by the pressure in the process that the inserting piece 43 is inserted into the inner side of the slot plate 44, when, thereby realize the fixed to drainage tube 1 position, it drives opening 462 to protect drainage tube 1 and implant head 2 department to rotate arc screening glass 461 simultaneously, reached the stable fixed to the drainage tube position, and prevent that external acting force from making the painful beneficial effect of patient, paste the adhesion layer 48 and the cotton layer 49 outside of magic subsides through the magic and be square form, and the magic is pasted adhesion layer 48 and the cotton layer 49 side surface of magic subsides and is flushed mutually, make it more stable to cross the connection of magic subsides adhesion layer 48 and magic subsides cotton layer 49.
The basic principle and the main features of the present invention and the advantages of the present invention are shown and described above, and the present invention can purchase the used standard parts from the market, the special-shaped parts can be customized according to the description of the specification and the attached drawings, the specific connection mode of each part adopts the conventional means such as bolt and rivet, welding, etc. matured in the prior art, and the machinery, the parts and the equipment all adopt the prior art, and the conventional typeNumber (C) ,The circuit connection adopts the conventional connection mode in the prior art,And will not be described in detail herein.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention 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.
Claims (8)
1. An implanted novel blood drainage tube for hemodialysis comprises a drainage tube body (1) and an implantation head (2), wherein the implantation head (2) is fastened at the right end of the drainage tube body (1), and the left end of the inner side of the drainage tube body (1) is tightly attached to the right end of the outer side of a sealing plug (3);
the method is characterized in that: the drainage tube further comprises a positioning structure (4), the positioning structure (4) is arranged at the right end of the outer side of the drainage tube body (1), the positioning structure (4) is composed of positioning cloth (41), elastic pieces (42), inserting pieces (43), slot plates (44), hollow clamping blocks (45), a protection structure (46), a connecting cloth block (47), a magic tape adhesive layer (48), a magic tape cotton layer (49), an arc-shaped clamping plate (410) and an anti-slip rubber sheet (411), the two elastic pieces (42) are symmetrically embedded into the upper end and the lower end of the rear end face of the positioning cloth (41), the inserting pieces (43) and the slot plates (44) are respectively fastened on the upper end face and the lower end face of the positioning cloth (41), the inserting pieces (43) movably extend into the inner sides of the slot plates (44), the hollow clamping blocks (45) are fastened on the top end faces of the inserting pieces (43), and the hollow clamping blocks (45) are matched with the inner, protection architecture (46) set up in location cloth (41) rear end face middle part, it sets up in location cloth (41) front end middle part to connect cloth (47), it has arc splint (410) to connect the symmetrical fastening of facade middle part around cloth (47), the magic is pasted adhesion coating (48) and is sewed up in connecting cloth (47) rear end face, the magic is pasted cotton layer (49) and is sewed up in location cloth (41) preceding terminal surface middle part, and magic is pasted cotton layer (49) and hug closely in magic subsides adhesion coating (48) rear end face, arc splint (410) cover right-hand member in drainage body (1) outside, and arc splint (410) inboard is pasted and is had anti-skidding sheet rubber (411), anti-skidding sheet rubber (411) are laminated in drainage body (1) surface.
2. The implantable novel blood drainage tube for hemodialysis according to claim 1, wherein: protection architecture (46) are detained (464) by arc protection piece (461), opening (462), extension board (463) and rotation and are constituteed, opening (462) are seted up in arc protection piece (461) preceding terminal surface left end face, and opening (462) medial surface covers drainage tube body (1) and implant head (2) outside end face with clearance fit's mode, extension board (463) set up in arc protection piece (461) right-hand member face for integrated configuration, and extension board (463) are detained (464) through rotating and are connected with location cloth (41) rear end face middle part rotation.
3. The implantable novel blood drainage tube for hemodialysis according to claim 1, wherein: the front end face of the connecting cloth block (47) is provided with a flexible cotton layer, and the thickness of the cotton layer is 0.2 cm.
4. The implantable novel blood drainage tube for hemodialysis according to claim 1, wherein: the front end of the outer side of the hollow clamping block (45) is in a tapered shape gradually reduced from back to front, and the front end of the top end face of the hollow clamping block (45) is connected with the top end face of the inserting piece (43).
5. The implantable novel blood drainage tube for hemodialysis according to claim 1, wherein: the outside of the magic tape sticking layer (48) and the outside of the magic tape cotton layer (49) are square, and the side surfaces of the magic tape sticking layer (48) and the magic tape cotton layer (49) are flush with each other.
6. The implantable novel blood drainage tube for hemodialysis according to claim 1, wherein: the arc-shaped clamping plates (410) are in a semicircular shape, and the two arc-shaped clamping plates (410) are enclosed to form a hollow tubular shape.
7. The implantable novel blood drainage tube for hemodialysis according to claim 1, wherein: the outer surface of the anti-skid rubber sheet (411) is provided with anti-skid salient points, and the anti-skid salient points are arranged on the outer surface of the anti-skid rubber sheet (411) at equal intervals.
8. The implantable novel blood drainage tube for hemodialysis according to claim 2, wherein: the arc protection sheet (461) and the rotating buckle (464) are provided with anti-skid paint, and the anti-skid paint is a rough outer surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020804595.7U CN213048568U (en) | 2020-05-14 | 2020-05-14 | Novel implanted blood drainage tube for hemodialysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020804595.7U CN213048568U (en) | 2020-05-14 | 2020-05-14 | Novel implanted blood drainage tube for hemodialysis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213048568U true CN213048568U (en) | 2021-04-27 |
Family
ID=75566034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020804595.7U Expired - Fee Related CN213048568U (en) | 2020-05-14 | 2020-05-14 | Novel implanted blood drainage tube for hemodialysis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213048568U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113425989A (en) * | 2021-06-25 | 2021-09-24 | 右江民族医学院附属医院 | Novel drainage tube is fixed device |
-
2020
- 2020-05-14 CN CN202020804595.7U patent/CN213048568U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113425989A (en) * | 2021-06-25 | 2021-09-24 | 右江民族医学院附属医院 | Novel drainage tube is fixed device |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210427 |
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| CF01 | Termination of patent right due to non-payment of annual fee |