US4100393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a cannula using a laser and the cannula made thereby
Assignee: CRAIG HUGH
•
Filing: 1977-02-08
•
Granted: 1978-07-11
•
Expires: 1997-02-08
Abstract
Abstract A process for making a removable cannula using a laser to make a longitudinal cut and a longitudinal score line in the cannula wall and the cannula made thereby.
Inventors
- 👤 Ronald B. Luther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:41
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0009; B; B23; B23K; B23K26/00; B23K26/20; B23K26/21; B23K26/22; B23K26/352
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
233 words
A method for making a removable catheterization cannula from tubular cannula stock having a bevel forming a tip end and a distal area comprising the steps of: (a) supporting a piece of tubular cannula stock for work operations; (b) applying to the outside of the wall of said stock from one end of said stock to the other on a straight longitudinal line whose anterior end is at the bevel distal area a laser beam regulated in intensity and duration to cut completely through the wall of said stock to form a straight longitudinal slot in said stock ending at the bevel distal area; (c) applying to the inside of the wall of said stock opposite said slot from one end of said stock to the other on a straight longitudinal line whose anterior end is at the bevel tip a laser beam regulated in intensity and duration to form a weakened fracture line in the wall of said stock; (d) contact positioning on the outside of the wall of said stock adjacent said fracture line finger grips so that said finger grips extend on either side of said fracture line; (e) applying to the area of contact between said stock and said finger grips a laser beam of such intensity and duration as to weld said finger grips to said stock; and (f) removing the finished tubular cannula stock from the support.
Claim 2
Independent Claim
233 words
A method for making a removable catheterization cannula from tubular cannula stock having a bevel forming a tip end and a distal area comprising the steps of: (a) supporting a piece of tubular cannula stock for work operations; (b) applying to the outside of the wall of said stock from one end of said stock to the other on a straight longitudinal line whose anterior end is at the bevel distal area a laser beam regulated in intensity and duration to cut completely through the wall of said stock to form a straight longitudinal slot in said stock ending at the bevel distal area; (c) applying to the inside of the wall of said stock opposite said slot from one end of said stock to the other on a straight longitudinal line whose anterior end is at the bevel tip a laser beam regulated in intensity and duration to form a weakened fracture line in the wall of said stock; (d) contact positioning on the outside of the wall of said stock adjacent said fracture line finger grips so that said finger grips extend on either side of said fracture line; (e) applying to the area of contact between said stock and said finger grips a laser beam of such intensity and duration as to weld said finger grips to said stock; and (f) removing the finished tubular cannula stock from the support.
Claim 3
Dependent Claim
55 words
The method of claim 1 wherein said step of forming a weakened fracture line comprises applying to said longitudinal line a laser beam regulated in intensity and duration to alternately groove and perforate the wall of said stock while embrittling the remaining metal at said longitudinal line and leaving a groove at the bevel tip.
Claim 4
Dependent Claim
34 words
The method of claim 2 and including the step of applying a laser beam to the sharp edges of the bevel distal area of such intensity and duration as to remove said sharp edges.
Claim 5
Dependent Claim
11 words
A removable catheterization cannula made by the process of claim 2.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |