Patent ID: 8855789

Claim:
A method for implanting a biostimulation device in a heart of a patient, the method comprising: inserting a catheter, a stylet and leadless biostimulation device into the heart, the stylet having threads being engaged with the leadless biostimulation device, the leadless biostimulation device comprising a hermetic housing with an electrode coupled to the housing, the electrode covered by the catheter during the inserting step; engaging heart tissue with the biostimulation device; after the engaging and inserting steps, moving the catheter away from the heart tissue, thereby exposing the electrode, while maintaining the biostimulation device in contact with the tissue; after the moving step, performing threshold testing on the heart with the electrode; and rotating the stylet with respect to the biostimulation device while applying a counter-rotational force on the biostimulation device with the catheter, thereby disengaging the stylet threads from the biostimulation device, wherein the inserting step includes utilizing the stylet to maintain an engaging relation between the catheter and the leadless biostimulation device that prevents relative rotation therebetween.