An apparatus has been devised to enable accurate, reproducible angular positioning of an ultrasonic probe used to diagnose the carotid artery. More specifically, the apparatus is intended for use in a clinical setting in which the intima-media thickness (IMT) of the carotid artery is measured by use of information in ultrasound images. The IMT is useful as an indication of the health status of the carotid artery.
Ultrasonic probes are used to obtain longitudinal-view images of the carotid artery. The IMT can then be measured from these images. However, in order to obtain these images, it is necessary first to find the appropriate site with a transverse view and then to rotate each ultrasonic probe 90°. Heretofore, the probe has been rotated manually and without the benefit of a fixed reference.
The present apparatus includes a holder that accommodates various ultrasonic probes, and a cylindrical housing that rests on the patient's neck, acts as an anchor, and provides a fixed reference. A small stepping motor in the housing is coupled to the holder through gears. An electronic control unit sends control pulses to the motor when either a panel switch or a foot switch is pressed. The control pulses cause the motor to turn the holder, and thus the probe, by 90°. A second actuation of the switch causes the motor to rotate the probe back to the original angle.
The advantage afforded by this apparatus is greater (compared to manual rotation) accuracy in returning to a specific site in the carotid artery. The disadvantage is that the apparatus adds weight and bulk to the probe.
This work was done by Helenann Kwong-Fu, Paul L. Lee, and Robert Selzer of Caltech and Howard Hodis of USC for NASA's Jet Propulsion Laboratory.
In accordance with Public Law 96-517, the contractor has elected to retain title to this invention. Inquiries concerning rights for its commercial use should be addressed to
Intellectual Property group
JPL
Mail Stop 202-233
4800 Oak Grove Drive
Pasadena, CA 91109
(818) 354-2240
Refer to NPO-21244.
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Motorized Rotator for an Ultrasonic Probe
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Overview
The document outlines a technical support package for a novel apparatus developed by researchers at NASA's Jet Propulsion Laboratory (JPL) aimed at improving the accuracy of ultrasonic imaging of the carotid artery. The invention, known as the "Motorized Rotator for an Ultrasonic Probe," addresses a significant challenge in the clinical measurement of the intima-media thickness (IMT) of the carotid artery, which is a critical indicator of cardiovascular health.
Traditionally, obtaining longitudinal-view images of the carotid artery required manual rotation of the ultrasonic probe, which lacked a fixed reference point, leading to potential inaccuracies in positioning. The new apparatus features a compact holder that accommodates various ultrasonic probes and is integrated with a cylindrical housing that rests securely on the patient's neck, providing a stable anchor. This design allows for precise, reproducible angular positioning of the probe.
At the core of the apparatus is a small stepping motor that is coupled to the probe holder through gears. An electronic control unit enables the operator to rotate the probe by 90 degrees with the press of a panel or foot switch. This electronic rotation not only enhances the accuracy of returning to a specific site in the carotid artery but also streamlines the imaging process, making it more efficient for clinical use.
The document highlights both the advantages and disadvantages of the new system. The primary advantage is the increased precision in probe positioning, which is crucial for accurate IMT measurements. However, the apparatus does add some weight and bulk to the probe, which may be a consideration in its practical application.
The work was conducted by a team of inventors, including Helenann Kwong-Fu, Paul L. Lee, Robert Selzer, and Howard Hodis, under NASA's sponsorship. The document also includes a disclaimer regarding the use of trade names and the lack of endorsement by the U.S. Government.
In summary, this innovative motorized rotator represents a significant advancement in the field of medical imaging, particularly for cardiovascular diagnostics, by enhancing the reliability and efficiency of ultrasonic probe positioning.
