US5290267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hypodermic needle
Assignee: Fresenius SE and Co KGaA
•
Filing: 1993-02-19
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Granted: 1994-03-01
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Expires: 2013-02-19
Abstract
Abstract The invention concerns a cannula comprising a cannula tube with a preferably rigid upper section, an end section which is bent laterally and a hook-shaped curved section which has in its concave side a tangentially inward ground lumen opening. The lumen opening has a sharply inwardly directed rear edge. This results in the advantage that during piercing of natural and synthetic walls the cutting of plugs from the material to be perforated is avoided.
Inventors
- 👤 Michael Zimmermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:45
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/32; A61M5/3286
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
A cannula comprising: a cannula tube having a lumen therethrough, said cannula tube having an upper section at least a portion of which lies on a longitudinal axis of the cannula tube, an end section connected with the upper section and laterally disposed at an acute angle to the longitudinal axis of the cannula tube, and a hook-shaped curved section connected with the end section, the curved section terminating in a piercing part with a lumen opening therein, the lumen opening being tangentially ground into a concave side of the curved section and having, near the end section, a rear edge directed inwardly into the curved section.
Claim 2
Dependent Claim
107 words
A cannula comprising: a cannula tube having a lumen therethrough, said cannula tube having an upper section at least a portion of which lies on a longitudinal axis of the cannula tube, an end section connected with the upper section and laterally disposed at an acute angle to the longitudinal axis of the cannula tube, and a hook-shaped curved section connected with the end section, the curved section terminating in a piercing part with a lumen opening therein, the lumen opening being tangentially ground into a concave side of the curved section and having, near the end section, a rear edge directed inwardly into the curved section.
Claim 3
Dependent Claim
19 words
The cannula according to claim 1, wherein the piercing part has a lancet-shaped point with a beveled ground surface.
Claim 4
Dependent Claim
35 words
The cannula according to claim 2, wherein the point lies in an imaginary longitudinal line of the cannula tube which is an extension of the longitudinal axis of the upper section of the cannula tube.
Claim 5
Dependent Claim
13 words
The cannula according to claim 1 wherein the acute angle equals 6 degrees.
Claim 6
Dependent Claim
24 words
The cannula according to claim 1, wherein the piercing part has a length which equals 1/3 to 1/2 the length of the curved section.
Claim 7
Dependent Claim
16 words
The cannula according to claim 1, wherein the upper section of the cannula tube is straight.
Claim 8
Dependent Claim
19 words
The cannula according to claim 1, wherein the upper section of the cannula tube is bent at a 90°-angle.
Claim 9
Dependent Claim
12 words
The cannula according to claim 1, wherein the end section is straight.
Claim 10
Dependent Claim
12 words
The cannula according to claim 1, wherein the cannula tube is rigid.
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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) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |