Scanning mechanisms for imaging probe
The present invention provides scanning mechanisms for imaging probes using for imaging mammalian tissues and structures using high resolution imaging, including high frequency ultrasound and/or optical coherence tomography. The imaging probes include adjustable rotational drive mechanism for imparting rotational motion to an imaging assembly containing either optical or ultrasound transducers which emit energy into the surrounding area. The imaging assembly includes a scanning mechanism having including a movable member configured to deliver the energy beam along a path out of said elongate hollow shaft at a variable angle with respect to said longitudinal axis to give forward and side viewing capability of the imaging assembly. The movable member is mounted in such a way that the variable angle is a function of the angular velocity of the imaging assembly.
1. A scanning device for directing an energy beam during rotary motion, comprising:
a support;
a tiltable member pivotally coupled to said support; and
an energy emitting device configured to emit an energy beam, wherein said energy emitting device is located such that a beam angle associated with said energy beam is dependent on a tilt angle of said tiltable member;
wherein the tilt angle of said tiltable member is controllable for scanning the beam angle; and
wherein said tiltable member is pivotally supported by a low-friction pivot mechanism comprising a pair of pivot pins received within respective indentations.
2. The scanning device according to claim 1 wherein said energy emitting device is supported by said tiltable member.
3. The scanning device according to claim 2 wherein said low-friction pivot mechanism is configured to provide electrically conductive paths to said energy emitting device for delivering electrical energy thereto and for receiving electrical signals therefrom.
4. The scanning device according to claim 3 wherein each pivot pin of said low-friction pivot mechanism comprises an electrically conductive tip in electrical communication a respective electrical conductive path that is insulated within said each pivot pin, and wherein each indentation comprises an electrically insulated region and an electrically conductive region, wherein each electrically conductive region is configured to contact a tip of a respective pivot pin.
5. The scanning device according to claim 2 wherein said support further comprises a pair of flexible electrical conductors in electrical communication with said energy emitting device, wherein said pair of flexible electrical conductors are configured to provide a restoring mechanism for urging said tiltable member away from a preferred orientation.
6. The scanning device according to claim 1 wherein said tiltable member comprises said indentations, and wherein said tiltable member is rotationally supported by said pivot pins.
7. The scanning device according to claim 1 wherein said support is a rotary component, wherein said rotary component is rotatable about a rotatable axis, said scanning device further comprising:
a restoring mechanism configured to apply a force to said tiltable member for urging said tiltable member away from a preferred orientation;
wherein said low-friction pivot mechanism is configured such that the beam angle is controlled by adjusting an angular velocity of said rotary component.
8. The scanning device according to claim 1 wherein said tiltable member comprises a magnet, and wherein said support comprises an electromagnet spaced sufficiently close to said tiltable member for said magnet to interact with said electromagnet, said electromagnet being connectable to an electromagnetic power supply, wherein said tiltable member is mounted in such a way that the beam angle is a function of power applied to said electromagnet.
9. The scanning device according to claim 1 wherein said energy emitting device is an ultrasound transducer.