Patent US1980958A successfully refreshed from Google Patents.
US4904256A
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Magnetic artificial anus having sphincter function
Assignee: Meito Sangyo KK
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Filing: 1987-02-24
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Granted: 1990-02-27
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Expires: 2007-02-24
Abstract
Abstract A magnetic artificial anus assembly comprising a combination of an annular bag structure formed of a bio-affinitive flexible material and filled with a magnetic fluid and a plug structure having a magnet member. It has a sphinter function similar to the natural anus.
Inventors
- 👤 Takashi Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:23
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/0004; A61F2/0009; A61F2/0018; Y; Y10; Y10S; Y10S128/00; Y10S128/25
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
An implantable magnetic artificial anus having sphincter functions comprising: a flexible annular hollow bag formed of a bioaffinitive flexible film having a film thickness of 0.1 to 0.5 mm and filled with a magnetic fluid; and a plug member having in combination a cylindrical body defining upper and lower ends, and an umbrella shaped cap integral with the upper end thereof, said cylindrical body having permanent magnet disposed therein and said body having a hollow ventilation chamber extending from the upper to the lower end, said ventilation chamber having gas permeating filters disposed at each end thereof and said chamber being filled with gas permeating material, whereby said annular bag is disposed about the periphery of a natural or artificial colon and the cylindrical body of the plug member is inserted into the colon directly adjacent the annular bag such that the permanent magnet in the cylindrical body causing the flexible bag to constrict about said colon in a natural sphincter manner thereby securing the plug member within the colon.
Claim 2
Dependent Claim
170 words
An implantable magnetic artificial anus having sphincter functions comprising: a flexible annular hollow bag formed of a bioaffinitive flexible film having a film thickness of 0.1 to 0.5 mm and filled with a magnetic fluid; and a plug member having in combination a cylindrical body defining upper and lower ends, and an umbrella shaped cap integral with the upper end thereof, said cylindrical body having permanent magnet disposed therein and said body having a hollow ventilation chamber extending from the upper to the lower end, said ventilation chamber having gas permeating filters disposed at each end thereof and said chamber being filled with gas permeating material, whereby said annular bag is disposed about the periphery of a natural or artificial colon and the cylindrical body of the plug member is inserted into the colon directly adjacent the annular bag such that the permanent magnet in the cylindrical body causing the flexible bag to constrict about said colon in a natural sphincter manner thereby securing the plug member within the colon.
Claim 3
Dependent Claim
21 words
The artificial anus set forth in claim 1 wherein the magnetic fluid is an aqueous sol of magnetic iron oxide-dextran complex.
Claim 4
Dependent Claim
20 words
The artificial anus set forth in claim 1 wherein the film has a film thickness of 0.1 to 0.2 mm.
Claim 5
Dependent Claim
41 words
The artificial anus set forth in claim 1 wherein the cylindrical body comprises a plurality of ring-like permanent magnets stacked in the axial direction of the cylindrical via adhesive layers so that the same poles of adjacent magnets oppose each other.
Claim 6
Dependent Claim
17 words
The artificial anus set forth in claim 1 wherein the cylindrical body comprises a single permanent magnet.
References Cited (Backward Citations)
US4209010A
Cited
US4210132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |