Abstract
Tissue-mimicking phantoms are essential for understanding the mechanics of needle-tissue interactions. Recent developments in active needles, especially for prostate brachytherapy, involve self actuation of the needle using actuators placed on the body of the needle, where actuation forces is generated by resistively heating shape memory alloy wires with electric current [1]. Therefore, the phantom materials should be able to mimic both the mechanical and thermal properties of the real tissue. Polyacrylamide (PA) gels, apart from meeting these requirements, can simulate the tissue damage from excessive heating by adding proteins to the tissue [2]. As an initial step, this work will synthesize PA gels that mimic the prostate tissue and then study the mechanical properties of these gels. Mechanical properties of the PA gels were determined by unconstrained compression and indentation tests.
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