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US 5,205,828 AGranted
Epidural needle location indicator assembly
OwnerDan Kedeminventor
Life of this patent
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Abstract
An epidural needle location indicator device for semiautomatically indicating when an epidural needle has entered into the epidural space in preparation of the delivery of epidural anesthesia. The device can be used with conjunction with a conventional Tuohy needle and takes advantage on the reduction in pressure experienced upon entry into the epidural space causes a visible controlled forward movement of the stilette.
Claims13
An epidural needle location indicator assembly capable of indicating when a needle traveling through hard tissue first penetrates soft tissue, comprising:
- (a) a housing;
- (b) a hollow needle secured near its posterior end to the anterior end of said housing and having an anterior end which is directed laterally;
- (c) a displaceable piston located in said housing, capable of traveling between a fixed forward displaceable piston position and a fixed back displaceable piston position, said piston positions being a preselected distance apart;
- (d) a flexible blind end catheter located in said needle, passing through said displaceable piston, said blind end catheter preventing coring of tissues during the forward travel of said needle and serving to transmit tissue pressure to said displaceable piston;
- (e) a grasping means connected to said displaceable piston for alternately grasping or releasing said catheter;
- (f) means for releasably locking said displaceable piston to said housing at said back displaceable piston position;
- and
- (g) means for biasing said displaceable piston toward said front piston position.
5 more elements
Dependencies are inferred from the claim text.