Catheter system with linear actuation control mechanism

The present teachings provide a delivery catheter with a deflectable tip and the deflection angle of the deflectable tip can be accurately controlled. Specifically, the delivery catheter includes a deflectable distal tip operably coupled to a pull wire, an elongated catheter portion, and a control mechanism. The control mechanism is configured to activate a rapid transformation of the deflectable tip from its linear profile to its curved profile. The control mechanism further includes a linear actuation mechanism. Such linear actuation mechanism converts a rotation motion of the control mechanism to a precise linear motion, which in turn accurately controls the bend angle of the deflectable tip of the delivery catheter. Such control mechanism can be used in applications that require the control of the distal deflection of the catheter, such as EP catheter, trans-septal device, and other devices.