Patent ID: 7007396

Claim:
A heart valve sizing system comprising: a lumen advanceable in vasculature; an inside caliper device at a distal end of the lumen, the inside caliper device including: a four bar linkage with first and second opposing pivot points and third and fourth opposing pivot points, and a push rod connected to the second pivot point for alternatively urging the third and fourth pivot points together when extended and urging the third and fourth pivot points apart when retracted to gauge the inside dimension of the vasculature; and means for reading the dimension gauged by the inside caliper device, the means for reading including: a member connected on one end to the push rod, a mechanism at the other end of the member which advances and retracts the member, a position sensor which senses the position of the member, and a readout device responsive to the position sensor which correlates the position of the member to the dimension gauged by the four bar linkage.