Patent ID: 8360982

Claim:
A catheter tip comprising: a micromotor disposed in an acoustic coupling fluid; an ultrasound imaging transducer rotatably coupled to said micromotor and disposed in the acoustic coupling fluid; a rotatable portion rotatably coupled to said ultrasound imaging transducer; and a moisture barrier comprised of one of a flexible membrane boot or a membrane seal including a resilient opening, the moisture barrier disposed so as to reduce or prevent the acoustic coupling fluid from entering said micromotor, wherein the membrane seal including the resilient opening is shaped and sized to attach to said micromotor and configured substantially circular and having a generally cylindrical membrane rim extending from a circumferential perimeter, the cylindrical membrane rim being retained by at least one membrane ring and wherein the membrane seal is configured to minimize rotational torque load on the micromotor and allow for rotational motion between the micromotor and the rotatable portion; wherein said flexible membrane boot is shaped and sized to enclose said micromotor and the rotatable portion and wherein said flexible membrane boot is configured to allow for rotational motion between the micromotor and the rotatable portion.