Medical tool for reduced penetration force with feedback means

Abstract

A medical device for reducing the force necessary to penetrate living being tissue using a variety of reciprocating motion actuators, including piezoelectric, voice coil, solenoids, pneumatics or fluidics. The reciprocating actuator drives a penetrating member, such as a needle, through the tissue at a reduced force while the device detects the passage of the penetrating member through the tissue. Upon passage of the penetrating member through the tissue, electrical power to the reciprocating actuator is automatically terminated. One exemplary method for detecting this passage is via a fluid-containing syringe that is coupled to a channel within the penetrating member.; Once the penetrating member tip has passed through the living tissue, the fluid within the syringe no longer experiences any pressure and a plunger within the syringe displaces indicating passage of the penetrating member tip. This motion can provide direct tactile feedback to an operator of the medical device or can automatically open a switch providing electrical power to the medical device. Alternatively, a pressure transducer can also monitor the pressure within the penetrating member channel and automatically activate the switch to cut off the electrical power.

Description

[0001] Cross References to Related Applications [0002] This PCT application claims the benefit under 35 U.S.C. § 119(e) of Provisional Application No. 61 / 089,756, filed September 15, 2008, entitled "Medical Tools for Reducing Penetration With Feedback Device," The entire disclosure of the above application is incorporated herein by reference. technical field [0003] The present invention relates generally to hand-held medical devices, and more particularly to electrically powered lancets, epidural catheter inserters, biopsy medical devices (e.g., bone biopsy medical devices), access penetrators, spinal needles, and other catheterization needles . The invention is suitable for transporting and removing blood, tissue, medicine, bone marrow, nutrients or other substances in the body. Background technique [0004] An epidural is a form of local anesthesia that involves injecting medication directly into the epidural space. When the procedure is initiated, a needle is inser...

AI Technical Summary

Problems solved by technology

One problem with this conventional device and method is that it is difficult for the clinician to apply a biasing force to the plunger while applying an advancing force relative to the syringe body (causing the needle to enter the ligamentum flavum)

Furthermore, to prevent accidental dural punctures, clinicians tend to hold conventional syringes in a manner that stabilizes the patient while applying forward power to the syringe and biasing force to the plunger rod, thus making it difficult for the clinician and All patients feel trouble and discomfort

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