US4885004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating stylus cystitome
Assignee: Individual
•
Filing: 1989-04-25
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Granted: 1989-12-05
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Expires: 2009-04-25
Abstract
Abstract Novel surgical instruments for cutting soft tissues, and the like, are provided. The instruments include an elongated shaft having a cutting member rotatably mounted to the shaft and disposed to slide against a substantially planar surface of the shaft. The stylus and planar surfaces are disposed to provide smooth rotating action to the cutting instrument during such surgical procedures as cataract operations. The instruments also preferably include cutting blades having blade faces forming acute angles of less than 50°, for providing sharp cutting surfaces even when the instruments are tilted by a surgeon while accessing tight surgical areas.
Inventors
- 👤 David S. C. Pao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:25
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3209; A61B17/3211; A61F; A61F9/00; A61F9/007; A61F9/00736; A61F9/00754; A61F9/013; A61F9/0133
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
138 words
A rotating stylus cystitome comprising: (a) an elongated rigid shaft having a central longitudinal axis and an end portion with an aperture transversely disposed therethrough, said end portion having a substantially planar surface disposed on a surgically superior surface of said shaft substantially perpendicularly to a central axis of said aperture; and (b) a cutting member comprising a swivel portion rotatably mounted to said shaft through said aperture and an outwardly facing knife portion laterally disposed from said swivel portion, said swivel portion comprising a superior end disposed to slide against said substantially planar surface to provide smoother rotation to said cutting member as it rotates on the shaft; said cutting member further comprising a heel portion extending in a surgically inferior direction further from said central longitudinal axis than at least a portion of said knife portion.
Claim 2
Dependent Claim
138 words
A rotating stylus cystitome comprising: (a) an elongated rigid shaft having a central longitudinal axis and an end portion with an aperture transversely disposed therethrough, said end portion having a substantially planar surface disposed on a surgically superior surface of said shaft substantially perpendicularly to a central axis of said aperture; and (b) a cutting member comprising a swivel portion rotatably mounted to said shaft through said aperture and an outwardly facing knife portion laterally disposed from said swivel portion, said swivel portion comprising a superior end disposed to slide against said substantially planar surface to provide smoother rotation to said cutting member as it rotates on the shaft; said cutting member further comprising a heel portion extending in a surgically inferior direction further from said central longitudinal axis than at least a portion of said knife portion.
Claim 3
Dependent Claim
18 words
The cystitome of claim 1 wherein said knife portion comprises a cutting blade terminating in a sharp point.
Claim 4
Dependent Claim
26 words
The cystitome of claim 2 wherein said heel portion is disposed to provide a tensile force in said tissue when engaged with said tissue for cutting.
Claim 5
Dependent Claim
19 words
The cystitome of claim 3 wherein said heel portion is disposed on said cutting member above said sharp point.
Claim 6
Dependent Claim
19 words
The cystitome of claim 3 wherein said heel portion is disposed on said cutting member below said sharp point.
Claim 7
Dependent Claim
28 words
The cystitome of claim 3 wherein said heel portion is disposed on said cutting member at about the same distance from said rigid shaft as said sharp point.
Claim 8
Dependent Claim
36 words
The cystitome instrument of claim 1 wherein said cutting member comprises a crimped portion disposed on a superior end of said cutting member, said crimped portion having a dimension larger than the diameter of said aperture.
Claim 9
Dependent Claim
25 words
The cystitome of claim 7 wherein said crimped portion is slidably disposed on said surgically superior surface of said end portion of said rigid shaft.
Claim 10
Dependent Claim
19 words
The cystitome of claim 8 wherein said end portion comprises an inferior surface which is a substantially planar surface.
Claim 11
Dependent Claim
19 words
The cystitome of claim 9 wherein said blade comprises a concave configuration between said heel and said sharp point.
Claim 12
Dependent Claim
19 words
The cystitome of claim 10 wherein said blade comprises at least two blade faces forming an acute angle therebetween.
Claim 13
Dependent Claim
14 words
The cystitome of claim 11, wherein said acute angle is less than about 50°.
Claim 14
Dependent Claim
14 words
The cystitome of claim 11 wherein said acute angle is less than about 40°.
Claim 15
Dependent Claim
14 words
The cystitome of claim 11 wherein said acute angle is less than about 30°.
Claim 16
Dependent Claim
20 words
The cystitome of claim 14 wherein a said blade comprises an outwardly facing convex portion disposed next to sharp point
Claim 17
Dependent Claim
19 words
The cystitome of claim 7 wherein said crimped portion is disposed in a recessed portion of said rigid shaft.
Claim 18
Dependent Claim
19 words
The cystitome of claim 1 wherein said shaft is cannulated; to provide fluids through the end of said shaft.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |