US5928239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percutaneous surgical cavitation device and method
Assignee: WASHINGTON, University of
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Filing: 1998-03-16
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Granted: 1999-07-27
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Expires: 2018-03-16
Abstract
Abstract A device and method for percutaneous surgical cavitation. The device includes an elongated shaft and cutting tip interconnected by a freely-rotating hinge. Upon rotation of the shaft to a sufficient velocity, the cutting tip will be deflected toward a position that is angularly offset from the shaft's access of rotation. The length of the cutting tip will determine the radius of the cavity being formed, which may be several times the radius of the shaft. The method of the present invention provides for formation of a cavity within a body through a small percutaneous access opening such that an enlarged cavity may be formed without an invasive access opening. The present invention also provides a method of percutaneous prophylactic replacement of osteoporotic bone wherein weakened bone material is removed from a cavity using only a needle-sized access opening. Strengthening bone replacement material, such as bone cement, can be injected into the cavity to provide reinforcement of weakened bone without invasive surgical access.
Inventors
- 👤 Sohail K. Mirza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:23
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/3205; A61B17/3207; A61B17/320725; A61B17/16; A61B17/1662; A61B17/1664; A61B17/1668; A61B17/320016; A61B17/32002; A61B17/1613; A61B17/1615; A61B17/1617; A61B17/1684; A61B17/1686; A61B17/56; A61B17/58; A61B17/88; A61B17/8802; A61B17/8805; A61B17/00234; A61B2017/00238; A61B2017/00261; A61B2017/320044; A61B2017/320733
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
112 words
A percutaneous surgical cavitation device, comprising: an elongated shaft having a radius and an axis of rotation; a cutting tip having a fixed length; and a hinge interconnecting the shaft and cutting tip allowing free rotation of the cutting tip relative to the shaft in an arc coplanar with the shaft's axis of rotation between a first position substantially co-axial with the shaft and a second position angularly offset from the shaft's axis of rotation, whereby rotation of the shaft at sufficient velocity will cause the cutting tip to be deflected toward the second position to effect formation of an internal cavity having a radius greater than the radius of the shaft.
Claim 2
Dependent Claim
112 words
A percutaneous surgical cavitation device, comprising: an elongated shaft having a radius and an axis of rotation; a cutting tip having a fixed length; and a hinge interconnecting the shaft and cutting tip allowing free rotation of the cutting tip relative to the shaft in an arc coplanar with the shaft's axis of rotation between a first position substantially co-axial with the shaft and a second position angularly offset from the shaft's axis of rotation, whereby rotation of the shaft at sufficient velocity will cause the cutting tip to be deflected toward the second position to effect formation of an internal cavity having a radius greater than the radius of the shaft.
Claim 3
Dependent Claim
25 words
The device of claim 1, wherein deflection of the cutting tip is limited to an angle less than 90° from the shaft's axis of rotation.
Claim 4
Dependent Claim
17 words
The device of claim 1, wherein said second position is 90° from the shaft's axis of rotation.
Claim 5
Dependent Claim
28 words
The device of claim 1, wherein the cutting tip is hinged for movement in either of two diametrically opposite angular positions relative to the shaft's axis of rotation.
Claim 6
Dependent Claim
18 words
The device of claim 1, wherein the shaft is rotated at a velocity in excess of 30,000 rpm.
Claim 7
Dependent Claim
16 words
The device of claim 1, wherein the radius of the shaft is less than 2.5 mm.
Claim 8
Dependent Claim
24 words
The device of claim 6, wherein the cavity formed by the device has a radius greater than three times the radius of the shaft.
Claim 9
Dependent Claim
17 words
The device of claim 6, wherein the length of the cutting tip is greater than 5 mm.
Claim 10
Dependent Claim
22 words
The device of claim 6, wherein the length of the cutting tip is greater than three times the radius of the shaft.
Claim 11
Dependent Claim
151 words
A surgical method for percutaneous formation of a cavity within a body, comprising the steps of: a) providing a percutaneous access opening; b) inserting through the access opening a rotary cavitation device comprising: i. an elongated shaft having a radius and an axis of rotation; ii. a cutting tip having a fixed length; and iii. a hinge interconnecting the shaft and cutting tip allowing free rotation of the cutting tip in an arc coplanar with the shaft's axis of rotation between a first position substantially co-axial with the shaft and a second position angularly offset from the shaft's axis of rotation; c) rotating the shaft at a velocity sufficient to cause the cutting tip to be deflected from the first position toward the second position to effect formation of an internal cavity having a radius greater than the radius of the shaft; and d) withdrawing the device from the access opening.
Claim 12
Dependent Claim
151 words
A surgical method for percutaneous formation of a cavity within a body, comprising the steps of: a) providing a percutaneous access opening; b) inserting through the access opening a rotary cavitation device comprising: i. an elongated shaft having a radius and an axis of rotation; ii. a cutting tip having a fixed length; and iii. a hinge interconnecting the shaft and cutting tip allowing free rotation of the cutting tip in an arc coplanar with the shaft's axis of rotation between a first position substantially co-axial with the shaft and a second position angularly offset from the shaft's axis of rotation; c) rotating the shaft at a velocity sufficient to cause the cutting tip to be deflected from the first position toward the second position to effect formation of an internal cavity having a radius greater than the radius of the shaft; and d) withdrawing the device from the access opening.
Claim 13
Dependent Claim
20 words
The method of claim 10, further comprising the step of irrigation and suction to remove ablated material from the cavity.
Claim 14
Dependent Claim
21 words
The method of claim 10, further comprising the step of injecting replacement material into the cavity through the percutaneous access opening.
Claim 15
Dependent Claim
20 words
The method of claim 10, further comprising the step of axially moving the device while the shaft is being rotated.
Claim 16
Dependent Claim
13 words
The method of claim 13, wherein the shaft is advanced forwardly during rotation.
Claim 17
Dependent Claim
13 words
The method of claim 13, wherein the shaft is partially withdrawn during rotation.
Claim 18
Dependent Claim
63 words
The method of claim 10, further comprising the additional steps of: a) inserting a second device having a cutting tip of a second fixed length; and rotating the shaft of the second device at a velocity sufficient to cause the cutting tip to be deflected toward the second position to effect formation of a second internal cavity interconnected with the first internal cavity.
Claim 19
Independent Claim
178 words
A method of percutaneous prophylactic replacement of osteoporotic bone, comprising the steps of: a) providing percutaneous access to the osteoporotic bone; b) drilling a guide hole along a predetermined axis to a predetermined depth; c) insertion of a rotary cavitation device comprising: i. an elongated shaft having a radius and an axis of rotation; ii. a cutting tip having a fixed length; and iii. a hinge interconnecting the shaft and cutting tip allowing free rotation of the cutting tip in an arc coplanar with the shaft's axis of rotation between a first position substantially co-axial with the shaft and a second position angularly offset from the shaft's axis of rotation; d) rotating the shaft at a velocity sufficient to cause the cutting tip to be deflected from the first position toward the second position to effect formation of an internal cavity having a radius greater than the radius of the shaft; and e) withdrawal of ablated material from the cavity through the percutaneous access; and f) injection of bone replacement material into the cavity through the percutaneous access.
Claim 20
Independent Claim
178 words
A method of percutaneous prophylactic replacement of osteoporotic bone, comprising the steps of: a) providing percutaneous access to the osteoporotic bone; b) drilling a guide hole along a predetermined axis to a predetermined depth; c) insertion of a rotary cavitation device comprising: i. an elongated shaft having a radius and an axis of rotation; ii. a cutting tip having a fixed length; and iii. a hinge interconnecting the shaft and cutting tip allowing free rotation of the cutting tip in an arc coplanar with the shaft's axis of rotation between a first position substantially co-axial with the shaft and a second position angularly offset from the shaft's axis of rotation; d) rotating the shaft at a velocity sufficient to cause the cutting tip to be deflected from the first position toward the second position to effect formation of an internal cavity having a radius greater than the radius of the shaft; and e) withdrawal of ablated material from the cavity through the percutaneous access; and f) injection of bone replacement material into the cavity through the percutaneous access.
Claim 21
Dependent Claim
13 words
The method of claim 17, wherein the bone replacement material comprises bone cement.
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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) | 2002-07-26 | 2003-01-25 | 2003-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-07-26 | 2007-01-25 | 2007-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-07-26 | 2011-01-25 | 2011-07-27 | $7700.00 | Window Closed / Lapsed |