Ultrasonically actuated needle pump system

Details Ultrasonically actuated needle pump system Ultrasonically actuated needle pump system

2005-08-02

2005-08-02

Robinson, Daniel (Department: 3742)

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

C128S200160, C604S164010

Reexamination Certificate

active

06923790

ABSTRACT:
An ultrasonically driven pump, which may be used for sampling body fluids or atomizing liquids, has a stationary outer needle and an inner needle mounted within the bore of the outer needle. The distal end of the inner needle is positioned adjacent to the distal end of the outer needle. The inner needle is ultrasonically vibrated by an ultrasonic actuator without vibrating the outer needle, with resulting draw of liquid through the distal end of the outer needle into the bore of the inner needle for discharge through the proximal end of the inner needle. The outer needle can be formed to have a penetrating tip suited for penetrating the skin of a subject to allow sampling of body fluids including interstitial fluids. The pump can also be used for atomizing liquid, by drawing liquid from a supply that is pumped from the distal end to an open proximal end of the inner needle where the liquid is discharged by atomization into the atmosphere.

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Amit Lal, “Micromachined Silicon Ultrasonic Longitudinal Mode Actuators: Theory and Applications to Surgery, Pumping, and Atomization,” Ph.D. Dissertation, University of California, Berkeley, 1996, pp. 137-177.

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