US4940458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epidural needle placement system
Assignee: Individual
•
Filing: 1989-02-02
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Granted: 1990-07-10
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Expires: 2009-02-02
Abstract
Abstract An epidural needle placement system and procedure comprising a hollow barrel and an epidural needle for insertion therein that is adapted to be advanced in a controlled manner.
Inventors
- 👤 Arnold K. Cohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:00
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/34; A61B17/3401; A61B17/04; A61B17/06; A61B17/06066; A61B2017/06085; A61B5/00; A61B5/48; A61B5/4887; A61B5/4896; A61B90/00; A61B90/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
An epidural needle placement device that comprises: a hollow barrel having a sharp tip at its distal end and internal threads on its proximal portion; a hollow epidural needle having a blunt tip at its distal end and external threads on its proximal portion that are adapted to engage the internal threads on said barrel; a flat tab that engages the barrel and is adapted to prevent penetration of the barrel into the epidural space of a patient; a knob that is affixed to the proximal end of the epidural needle that is adapted to advance the needle with respect to the barrel upon rotation of said knob; and a pressure monitor that is affixed to the proximal tip of the needle to monitor changes in pressure upon entry of the needle into the epidural space of the patient.
Claim 2
Dependent Claim
139 words
An epidural needle placement device that comprises: a hollow barrel having a sharp tip at its distal end and internal threads on its proximal portion; a hollow epidural needle having a blunt tip at its distal end and external threads on its proximal portion that are adapted to engage the internal threads on said barrel; a flat tab that engages the barrel and is adapted to prevent penetration of the barrel into the epidural space of a patient; a knob that is affixed to the proximal end of the epidural needle that is adapted to advance the needle with respect to the barrel upon rotation of said knob; and a pressure monitor that is affixed to the proximal tip of the needle to monitor changes in pressure upon entry of the needle into the epidural space of the patient.
Claim 3
Independent Claim
106 words
A method of inserting a hollow epidural needle into the epidural space of a patient that comprises the steps of: inserting an internally threaded hollow barrel of an epidural needle placement device through the skin of a patient; inserting an externally threaded hollow epidural needle into the barrel; engaging the threads of said needle with the threads of said hollow barrel; rotating the needle with respect to the barrel to advance the needle into the epidural space of the patient; monitoring the pressure; and stopping said rotation upon a sudden decrease in pressure which signifies entry of the needle into the epidural space of the patient.
Claim 4
Independent Claim
106 words
A method of inserting a hollow epidural needle into the epidural space of a patient that comprises the steps of: inserting an internally threaded hollow barrel of an epidural needle placement device through the skin of a patient; inserting an externally threaded hollow epidural needle into the barrel; engaging the threads of said needle with the threads of said hollow barrel; rotating the needle with respect to the barrel to advance the needle into the epidural space of the patient; monitoring the pressure; and stopping said rotation upon a sudden decrease in pressure which signifies entry of the needle into the epidural space of the patient.
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) | 1993-07-09 | 1994-01-08 | 1994-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-09 | 1998-01-08 | 1998-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-09 | 2002-01-08 | 2002-07-10 | $7700.00 | Window Closed / Lapsed |