Methods and devices for differentiating between tissue types

Details Methods and devices for differentiating between tissue types Methods and devices for differentiating between tissue types

A - Human Necessities

61

B

A61B 18/14 (2006.01) A61B 18/16 (2006.01)

Patent

CA 2663291

The subject invention utilizes the characteristics of in vivo tissue impedances to provide an embodiment of a medical instrument capable of providing a visible and/or preferably an audible signal to a surgeon that more clearly indicates which type of tissue(s) is in contact with the instrument. A preferred embodiment comprises a handheld, battery operated retinal rake having two electrodes, wherein at least one electrode is the modified retinal rake. Upon contact with different optical tissues, e.g., epiretinal membranes, retinal tissue, vitreous humor, etc., the electrodes detect varying impedances which are translated by onboard circuitry into various signals that indicate what type of tissue, fluid, structure, etc. is in contact with the retinal rake.

L'objet de la présente invention utilise les caractéristiques d'impédance des tissu in vivo pour fournir le mode de réalisation d'un instrument médical capable de produire un signal visuel et/ou de préférence sonore au chirurgien afin d'indiquer de manière plus claire le type de tissu(s) avec lequel l'instrument est en contact. Un mode de réalisation préféré comprend un vagueur rétinien portable alimenté par accumulateurs et doté de deux électrodes, l'une d'entre elles au moins étant le vagueur rétinien modifié. Au contact de divers tissus optiques tels que les membranes épirétinales, le tissu rétinien, l'humeur vitrée etc., les électrodes détectent les variations d'impédance qui sont transformées par circuiterie embarquée en signaux variés indiquant le type de tissu, de fluide, de structure etc. qui est en contact avec le vagueur rétinien.

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