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Thermally Triggered Blade Release Disclosure Number: IPCOM000243115D
Publication Date: 2015-Sep-16
Document File: 1 page(s) / 145K

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During the application of advanced bipolar energy, it is necessary to inhibit the activation of the transection blade until the tissue treatment is completed. One indication of completed tissue treatment is elevation of the temperature of the tissue. If the transection blade is activated early it can prevent proper sealing of the tissue, adversely impacting the patient.

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Thermally Triggered Blade Release


During the application of advanced bipolar energy, it is necessary to inhibit the activation of the  transection blade until the tissue treatment is completed.  One indication of completed tissue treatment  is elevation of the temperature of the tissue.  If the transection blade is activated early it can prevent  proper sealing of the tissue, adversely impacting the patient. 


A blade release mechanism which is triggered by the elevation of temperature in the tissue and  contacting electrode and jaw material is proposed to meet this need.  When most materials increase in  temperature they exhibit thermal expansion i.e. 304 Stainless Steel has a coefficient of thermal  expansion of 14.7x10‐6 C‐1.  There exist engineered alloys such as Invar and Super‐Invar which exhibit  coefficients of thermal expansion of 0.63x10‐6 C‐1 or less over a specified temperature range.  These  materials are available in wire format which can be utilized in combination with a series of amplifying  levers to magnify the available differential expansion to activate an output lever which would in turn  allow the transection blade to be activated.  A 1‐inch long section subjected to a 20C temperature  change results in 0.0003" of differ...