US5423824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of accessing hard tissue
Assignee: Aprio Medical AB
•
Filing: 1993-03-23
•
Granted: 1995-06-13
•
Expires: 2013-03-23
Abstract
Abstract A device for puncturing cortical bone. The device consists of a cannula and inside of it an axially movable needle. The distal end of the needle has an eccentrically shaped tip which, by drilling, forms a hole, larger than the outer diameter of the needle, through corticalis, whereupon the enclosing cannula can be inserted into the drilled hole. In this way the cannula's position in the bone is secured and the cannula functions as a fixed anchored guiding channel for further sampling or treatment.
Inventors
- 👤 Dan Akerfeldt
- 👤 Gunnar Astrom
- 👤 Hakan Ahlstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:40
CPC Classifications
A; A61; A61B; A61B10/00; A61B10/02; A61B10/0233; A61B10/025; A61B17/00; A61B17/16; A61B17/1613; A61B17/1615; A61B17/34; A61B17/3472; A61B90/00; A61B90/03
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
A method of accessing hard tissue in humans or animals, comprising the steps of: (a) puncturing a soft tissue around the hard tissue by a first needle inserted within a cannula; (b) drilling a hole having a diameter larger than the diameter of the cannula in the hard tissue with a second needle, wherein the drilling includes rotating the second needle with a drill point having a radial displacement in relation to an axial center of the second needle; (c) inserting the cannula into the hole; and (d) removing the second needle.
Claim 2
Independent Claim
92 words
A method of accessing hard tissue in humans or animals, comprising the steps of: (a) puncturing a soft tissue around the hard tissue by a first needle inserted within a cannula; (b) drilling a hole having a diameter larger than the diameter of the cannula in the hard tissue with a second needle, wherein the drilling includes rotating the second needle with a drill point having a radial displacement in relation to an axial center of the second needle; (c) inserting the cannula into the hole; and (d) removing the second needle.
Claim 3
Dependent Claim
60 words
A method as in claim 1, further comprising the steps of: (a) initially inserting the first needle with a smooth tapered tip into the cannula; (b) after the puncturing step, removing the first needle with the smooth tapered tip from the cannula; and (c) inserting the second needle with the drill point into the cannula, prior to the drilling step.
Claim 4
Dependent Claim
16 words
A method as in claim 1, wherein the drilling step comprises rotating the second needle manually.
Claim 5
Dependent Claim
18 words
A method as in claim 1, wherein the drilling step comprises rotating the second needle by a machine.
Claim 6
Dependent Claim
25 words
A method as in claim 1, further comprising the step of accessing a portion of the hard tissue through the cannula, after the removing step.
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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) | 1998-06-12 | 1998-12-12 | 1999-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-12 | 2002-12-12 | 2003-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-12 | 2006-12-12 | 2007-06-13 | $7700.00 | Window Closed / Lapsed |