Patent DE524425C successfully refreshed from Google Patents.
US5827318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of dissecting tissue layers
Assignee: Medtronic Spine LLC
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Filing: 1997-05-27
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Granted: 1998-10-27
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Expires: 2017-05-27
Abstract
Abstract A fluid operated retractor for use in surgery. The retractor has a portion which is expandable upon the introduction of fluid under pressure. The expandable portion is made of a material strong enough, and is inflated to enough pressure, to spread adjoining tissues within the body. The retractor is especially useful in fiber optic surgery because it can be inserted percutaneously through a small opening then expanded to a much larger dimension when in the desired location, to retract tissue from within. The retractor may be used to spread a joint such as a knee joint or a shoulder joint, or may be used to separate tissue planes generally, to improve visualization and create a working space for the surgeon.
Inventors
- 👤 Peter M. Bonutti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:20
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/02; A61B17/0218; A61B17/025; A61B17/32; A61B17/320016; A61B17/320036; A61B17/3205; A61B17/3207; A61B17/320725; A61B2017/00535; A61B2017/00557; A61B2017/0256; A61B2017/320044; A61B2017/320048; A61B90/00; A61B90/06; A61B2090/062; A61M; A61M25/00; A61M25/0043; A61M2025/006; A61M25/10; A61M25/1002
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
A method for dissecting a first layer of tissue from a second layer of tissue along a natural tissue plane to create an anatomic space for the performance of a surgical procedure comprising the steps of: making an incision in a body which incision provides access to a natural tissue plane; introducing a deflated balloon into the incision and directing it to the location of said natural tissue plane; inflating the balloon for the purpose of causing substantial dissection of the first layer of tissue from the second layer of tissue along the natural tissue plane; and dissecting said first layer from said second layer for a substantial distance along said natural tissue plane by exerting force on said layers by inflating said balloon, thereby dissecting and creating said anatomic space.
Claim 2
Independent Claim
131 words
A method for dissecting a first layer of tissue from a second layer of tissue along a natural tissue plane to create an anatomic space for the performance of a surgical procedure comprising the steps of: making an incision in a body which incision provides access to a natural tissue plane; introducing a deflated balloon into the incision and directing it to the location of said natural tissue plane; inflating the balloon for the purpose of causing substantial dissection of the first layer of tissue from the second layer of tissue along the natural tissue plane; and dissecting said first layer from said second layer for a substantial distance along said natural tissue plane by exerting force on said layers by inflating said balloon, thereby dissecting and creating said anatomic space.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein a scope is inserted into said anatomic space.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein a surgical procedure is performed in said space.
Claim 5
Dependent Claim
14 words
The method of claim 3 wherein a scope is inserted into the anatomic space.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein said surgical procedure is performed while the balloon is in an inflated state.
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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) | 2001-10-26 | 2002-04-27 | 2002-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-10-26 | 2006-04-27 | 2006-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-10-26 | 2010-04-27 | 2010-10-27 | $7700.00 | Window Closed / Lapsed |