Abstract
A new application of stress-induced transformation of superelastic shape memory alloys(SMAs) for atraumatic haemostatic forceps has been proposed. In conventional haemostatsthe pressure on the clamping jaws directly reflects the passive response of biological tissues,exhibiting an exponential increase during grasping, thus making control within a safe rangedifficult. The proposed new concept of haemostatic forceps is to embed superelastic shapememory alloys in conventional forceps and to limit the clamping pressure of the forcepswithin a safe range via the unique stress–strain characteristics of superelastic SMA duringits stress-induced transformation. In the present paper, the potential of suchan idea for practical use is demonstrated with a newly developed prototype. Itis shown that the critical pressure was successfully controlled in the range of200–800 mm Hg, where superelastic SMA wires of 0.2 and 0.3 mm in diameter wereemployed.
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