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US 4,940,458 AGranted
Epidural needle placement system
OwnerArnold K. Cohninventor
Life of this patent
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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.
Claims2
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.
3 more elements
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.
4 more elements
Dependencies are inferred from the claim text.