Brian S Letzen

US Patent:

20100256481, Oct 7, 2010

Filed:

Sep 29, 2008

Appl. No.:

12/680663

Inventors:

Thomas H. Mareci - Gainesville FL, US
Rizwan Bashirullah - Gainesville FL, US
Brian S. Letzen - Coral Springs FL, US
Barbara L. Beck - Micanopy FL, US

International Classification:

A61B 5/055

US Classification:

600423

Abstract:

Embodiments of the invention pertain to a method and apparatus for magnetic resonance imaging and spectroscopy (MRI/S). In a specific embodiment, the method and apparatus for MRI/S can be applied at two or more resonant frequencies utilizing a wireless RF receiving coil. In an embodiment, the wireless coil, which can be referred to as the implant coil, can be incorporated into an implantable structure. The implantable structure can then be implanted in a living body. The wireless RF receiving coil can be inductively coupled to another RF coil, which can be referred to as an external coil, for receiving the signal from the wireless implant RF coil. In an embodiment, the implantable structure can be a capsule compatible with implantation in a living body. The implantable structure can incorporate a mechanism for adjusting the impedance of the implant coil so as to alter the resonance frequency of the implant coil. In a specific embodiment, the mechanism for adjusting the impedance of the implant coil can allow the implant coil to receive at least two resonance frequencies. In an embodiment, the implant coil can receive three resonance frequencies and in a further embodiment, the implant coil can receive any number resonance frequencies. These resonance frequencies can be controlled by adjusting the impedance of the implant coil. In an embodiment, the resonance frequencies of the implant coil are selected to correlate to MRI/S signals received from living tissues.

US Patent:

20100284014, Nov 11, 2010

Filed:

May 6, 2009

Appl. No.:

12/436329

Inventors:

Justin S. Baba - Knoxville TN, US
Brian S. Letzen - Coral Springs FL, US

Assignee:

UT-BATTELLE, LLC - Oak Ridge TN

International Classification:

G01N 21/51

US Classification:

356446, 702 19

Abstract:

An optical sample is mounted on a spatial-acquisition apparatus that is placed in or on an enclosure. An incident beam is irradiated on a surface of the sample and the specular reflection is allowed to escape from the enclosure through an opening. The spatial-acquisition apparatus is provided with a light-occluding slider that moves in front of the sample to block portions of diffuse scattering from the sample. As the light-occluding slider moves across the front of the sample, diffuse light scattered into the area of the backside of the light-occluding slider is absorbed by back side surface of the light-occluding slider. By measuring a baseline diffuse reflectance without a light-occluding slider and subtracting measured diffuse reflectance with a light-occluding slider therefrom, diffuse reflectance for the area blocked by the light-occluding slider can be calculated.

US Patent:

20150306291, Oct 29, 2015

Filed:

Apr 24, 2015

Appl. No.:

14/695750

Inventors:

- New Haven CT, US
Brian Letzen - Orange CT, US

International Classification:

A61M 1/12
A61M 1/10

Abstract:

The present invention provides a minimally-invasive percutaneous device that can be positioned within the body of a subject to aid in the movement or pumping of a bodily fluid. In one embodiment, the device comprises a plurality of pump units configured to transform from a first compressed configuration where the pump units are organized in a serial arrangement into a second expanded configuration where the pump units are reorganized into a parallel arrangement.