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US4480642A
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Dilation device for the cervix
Assignee: SKY POLYMERS PL A OF LP
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Filing: 1982-07-26
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Granted: 1984-11-06
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Expires: 2002-07-26
Abstract
Abstract There is disclosed a cervical canal swelling device having an essentially cylindrically shaped stem formed in major portion thereof of a dehydrated hydrogel having a swelling capacity of 0.01 to 0.25 and an enforced unimaxial deformation of at least 1.1 and sized to a diameter of from 2 to 10 mm. and to a length of from 35 to 150 mm.
Inventors
- 👤 Vladimir A. Stoy
- 👤 George P. Stoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:41
CPC Classifications
A; A61; A61M; A61M29/00; A61M29/02; A61L; A61L31/00; A61L31/14; A61L31/145
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
59 words
A device for dilation of a cervix by swelling comprised of an essentially cylindrically-shaped stem of 2 to 10 mm in diameter and 35 to 150 mm in length, said stem formed of at least a major portion of a dehydrated hydrogen having a swelling capacity of 0.01 to 0.25 and an enforced uniaxial deformation of at least 1.1.
Claim 2
Independent Claim
59 words
A device for dilation of a cervix by swelling comprised of an essentially cylindrically-shaped stem of 2 to 10 mm in diameter and 35 to 150 mm in length, said stem formed of at least a major portion of a dehydrated hydrogen having a swelling capacity of 0.01 to 0.25 and an enforced uniaxial deformation of at least 1.1.
Claim 3
Dependent Claim
25 words
The device in the claim 1 wherein said hydrogel has an enforced deformation of 0.75 to 1.25 times linear isotropic swellng deformation of said hydrogel.
Claim 4
Dependent Claim
19 words
The device according to the claim 1 wherein the said hydrogel contains a substantial concentration of ionizable functional groups.
Claim 5
Dependent Claim
59 words
The device according to claim 3 wherein said ionizable groups are selected from the groups consisting of CO.OX, .SO 3 X,--O.SO 3 X, --C(═N--OH)OH, NRR', --NRRR", pyrridyl or quarternized pyrridyl, where X is hydrogen, metal cation of N-containing cation and R,R' and R" are hydrogen, alkyl or substituted alkyl C 1 to C 6 with O or N atoms.
Claim 6
Dependent Claim
31 words
The device according to claim 1 wherein said hydrogel contains hydrophylic groups selected from a group consisting of amide, N-alkylamide, N,N-dialkylamide, --CO:NH:NHR, cyclic lactames, cyclic lactones and acrylic esters of polyhydroxycompounds.
Claim 7
Independent Claim
19 words
The device according to the claims 1, 3 or 5 wherein said hydrogel is derived from partially hydrolyzed polyacrylonitrile.
Claim 8
Dependent Claim
28 words
The device according to the claim 1 wherein said hydrogel is reinforced by a single element or multiple elements from a material substantially less swellable than said hydrogel.
Claim 9
Dependent Claim
20 words
The device according to claim 7 wherein said reinforcing element is oriented essentially along the longitudinal axis of said stem.
Claim 10
Dependent Claim
30 words
The device according to claim 8 wherein an end of said stem is flat and its dimension lateral to said longitudinal axis is larger than the diameter of said stem.
Claim 11
Independent Claim
18 words
The device according to claims 7 wherein said reinforcing element adheres to said hydrogel in a swollen state.
Claim 12
Dependent Claim
30 words
The device according to claim 10 wherein said hydrogel and said reinforcing element are connected by a layer with a swelling capacity increasing from said reinforcing element to said hydrogel.
Claim 13
Dependent Claim
31 words
The device according to claim 7 wherein said hydrogel and the reinforcing element are connected by a layer with a swelling capacity increasing from said reinforcing element to the said hydrogel.
Claim 14
Dependent Claim
23 words
The device according to claim 1 wherein an end of said stem is made of material is substantially less swellable than said hydrogel.
Claim 15
Dependent Claim
38 words
The device according to claim 13 wherein said hydrogel is reinforced by a single element or multiple elements from a material substantially less swellable than said hydrogel and said less swellable end is connected to said reinforcing element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |