US5100390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubeck spinal catheter needle
Assignee: Individual
•
Filing: 1990-10-22
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Granted: 1992-03-31
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Expires: 2010-10-22
Abstract
Abstract A needle hereafter referred to as a metal cannula is of thin-walled construction and designed with a solid noncutting pencil point possessing a tip with an elliptical side port located not more than 1 (one) cannula Outer Diameter (O.D.) length from the tip and via a hollow internal channel the axial length of the cannula is capable of guiding an inserted catheter through the cannula for projection laterally out of the cannula for subsequent indwelling placement of the introduced catheter upon removal of the cannula. The sideport is placed on the angled surface of the developing point so that it coincides with the angle of the pencil point. The elliptical sideport has a machined and polished rounded internal edge intersecting with the external surface. The construction of the cannula combining a large diameter with a pencil point and the location of an opening at the tip permits safe introduction of a spinal catheter into the subarachnoid space with minimum damage to tissues or membranes by either the cannula or a catheter exiting the sideport. The cannula is fitted with an obturator which coincides with the shape of the internal lumen of the cannula where the obturator tip curves upward to occlude the opening of the cannula sideport. The cannula of the present invention has application to subarachnoid and epidural regional anesthesia and pain management procedures. The present invention is designed preferably as a large gauge needle (17-21 gauge) so that it will accept insertion of a large flexible catheter (20 to 22 gauge in diameter) for indwelling placement.
Inventors
- 👤 Norma A. Lubeck
- 👤 Roberta C. Butler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:51
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/34; A61B17/3401
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
333 words
A cannula-obturator device for placement of an indwelling catheter and for providing spinal anesthesia therethrough comprising: a cannula comprising an axial shaft and terminating in a curved pencil point tip geometry, the cannula having a hollow channel extending through the center of the shaft from a hub at the front end to its termination communicating with an elliptical lateral opening on the curved surface of the tip end; a hollow channel at the tip end conforming to an inner curved wall surface ascending obliquely up from the bottom of the channel to the distal end of an elliptical lateral opening located on the curved surface of the cannula tip which provides both a guide surface for direction of a catheter to exit the lateral opening and occludes the tip distal to the end edge of the elliptical lateral opening; a tip having a pencil point geometry and includes an elliptical lateral opening entirely located on and conforming to the tip's curved surface wherein the piercing portion of said tip distal to the end edge of the elliptical lateral opening is of solid metal; an obturator comprising a solid rod comprising an axial shaft extending from a hub at the front end to the termination of the rod at the tip end said shaft having an external diameter smaller than the internal diameter of said hollow channel allowing the rod to slide into said hollow channel such that the tip of the rod positively but temporarily is received at said lateral opening of the said cannula so that the lateral opening and tip of the solid rod when positively fit together define an unbroken curved surface of said cannula tip which conforms to the inclined surface geometry of the cannula tip; an elliptical lateral opening, having a front and an end edge, on the tip of said cannula providing communication to the front end of the cannula for cerebral spinal fluid when said solid rod is withdrawn from the axial channel of the cannula.
Claim 2
Dependent Claim
333 words
A cannula-obturator device for placement of an indwelling catheter and for providing spinal anesthesia therethrough comprising: a cannula comprising an axial shaft and terminating in a curved pencil point tip geometry, the cannula having a hollow channel extending through the center of the shaft from a hub at the front end to its termination communicating with an elliptical lateral opening on the curved surface of the tip end; a hollow channel at the tip end conforming to an inner curved wall surface ascending obliquely up from the bottom of the channel to the distal end of an elliptical lateral opening located on the curved surface of the cannula tip which provides both a guide surface for direction of a catheter to exit the lateral opening and occludes the tip distal to the end edge of the elliptical lateral opening; a tip having a pencil point geometry and includes an elliptical lateral opening entirely located on and conforming to the tip's curved surface wherein the piercing portion of said tip distal to the end edge of the elliptical lateral opening is of solid metal; an obturator comprising a solid rod comprising an axial shaft extending from a hub at the front end to the termination of the rod at the tip end said shaft having an external diameter smaller than the internal diameter of said hollow channel allowing the rod to slide into said hollow channel such that the tip of the rod positively but temporarily is received at said lateral opening of the said cannula so that the lateral opening and tip of the solid rod when positively fit together define an unbroken curved surface of said cannula tip which conforms to the inclined surface geometry of the cannula tip; an elliptical lateral opening, having a front and an end edge, on the tip of said cannula providing communication to the front end of the cannula for cerebral spinal fluid when said solid rod is withdrawn from the axial channel of the cannula.
Claim 3
Dependent Claim
105 words
The cannula of claim 1, wherein an elliptical lateral opening in the curved surface of the cannula tip is established by boring or drilling so that the location of said lateral opening's end edge from the terminus of the tip is equal to the outer diameter of the said cannula and wherein the entire circumferential edge of said lateral opening is machine rounded from the exterior surface to the interior surface and wherein the major axis is equal to the outer diameter of the cannula shaft and the minor axis of the lateral opening is 0.82 to 0.76 (inclusive) times the major axis lineal length;
Claim 4
Dependent Claim
42 words
A cannula obturator device defined in claim 1 wherein a cannula shaft is marked at lineally spaced increments on the exterior surface at intervals of every 1 (one) centimeter beginning from the cannula tip and extending to the end of the hub.
Claim 5
Dependent Claim
45 words
A cannula-obturator device defined in claim 1, wherein the angle of the pencil point tip's major curved/inclined surface is defined by a line tangent to the curved surface intersecting the longitudinal center line of the cannula shaft at an angle of 15 to 20 degrees.
Claim 6
Dependent Claim
55 words
A cannula-obturator device defined in claim 1, wherein the pencil point tip begins from the point the exterior cannula shaft surface departs from a line parallel to the longitudinal axis of the cannula shaft providing a tip length that is 1.75 to 2.0 (inclusive) times as long as the outside diameter of the cannula shaft.
Claim 7
Dependent Claim
115 words
A cannula-obturator device defined in claim 1 having an obturator temporarily placed in the channel of the cannula during application of the cannula to the subarachnoid space further comprising; an obturator tip designed with an elliptic end conforming to the shape of the elliptic lateral opening and is positively received at said lateral opening of the cannula; an obturator tip which occludes said lateral opening; an obturator tip machined with a surface which positively fits at said lateral opening and lays flush with the curved surface of the cannula tip; an obdurator with a hub crimped into its front end opposite the tip end and which is positively received into the hub of said cannula.
Claim 8
Dependent Claim
19 words
A cannula-obturator device of claim 1 further having a hub designed for attachment of a syringe to the cannula.
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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) | 1995-03-31 | 1995-09-30 | 1996-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-31 | 1999-09-30 | 2000-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-31 | 2003-09-30 | 2004-03-31 | $7700.00 | Window Closed / Lapsed |