Siddarth Kamath Shevgoor

US Patent:

7282919, Oct 16, 2007

Filed:

Feb 6, 2006

Appl. No.:

11/275933

Inventors:

F David Doty - Columbia SC, US
Siddarth Shevgoor - Columbia SC, US

Assignee:

Doty Scientific, Inc. - Columbia SC

International Classification:

G01V 3/00

US Classification:

324321

Abstract:

“An MAS probe is disclosed for obtaining a substantial improvement in signal to noise (S/N) in triple-resonance high-resolution (HR) magic-angle-spinning (MAS) NMR of samples near room temperature (RT) in high-field magnets where the magnet's RT shim bore is greater than 60 mm. All critical circuit components, including the sample coils, are located along with the spinner assembly in a thermally insulated cold zone pressurized with helium gas. The spinner assembly attaches to a sealed, curved, rotor-loading tube to permit automatic sample change, and it is surrounded by a partially insulated jacket cooled with a cryogenic fluid, generally nitrogen gas. The MAS probe is also compatible with magic angle gradients, variable temperature operation, field locking, and commonly available closed-cycle cold fingers. ”.

US Patent:

7915893, Mar 29, 2011

Filed:

Nov 18, 2007

Appl. No.:

12/518946

Inventors:

Siddarth Shevgoor - Columbia SC, US
F David Doty - Coumbia SC, US

Assignee:

Doty Scientific, Inc. - Columbia SC

International Classification:

G01V 3/00

US Classification:

324318, 324321

Abstract:

All critical circuit components, including the sample coils, are located along with the spinner assembly in a region that may be evacuated to high vacuum for thermal insulation and high-voltage operation. A hermetically sealed spinner assembly simultaneously satisfies the requirements of hermeticity, low total emissivity, rf compatibility, spinning performance, magnetic compatibility, and high filling factor by utilizing metal construction except for the central region near the rf sample coils. Hence, it is possible to maintain high vacuum in the region external to the MAS spinner assembly even over a broad range of bearing and drive gas temperatures. A bundle of optical fibers is provided for tachometry for spin rates up to 60 kHz. The use of alumina disc capacitors allows the noise contributions from the most critical capacitors to be reduced to a minor fraction of the total and simplifies high voltage operation.

US Patent:

20060082371, Apr 20, 2006

Filed:

Oct 14, 2005

Appl. No.:

11/163344

Inventors:

F. Doty - Columbia SC, US
Siddarth Shevgoor - Columbia SC, US

Assignee:

DOTY SCIENTIFIC, INC. - Columbia SC

International Classification:

G01V 3/00
H02K 1/22

US Classification:

324321000, 310268000, 310261000

Abstract:

An improved axial gas bearing for a gas-driven NMR MAS sample rotor is disclosed that utilizes inward flow with a low rotational component over a rotor conical end. A conical flow region is formed between the rotor conical end and a conical stator bearing surface such that the included angle defining the stator surface is not less than the included angle defining the rotor conical end. Gas is injected radially inward with a significant axial rearward component from a number of small holes at high velocity from the periphery into the conical flow region. Compared to the radial velocity components, the tangential flow components of the injected gas are small and preferably opposed to the direction of the rotor rotation. The high and accelerating negative radial velocities may result in significant Bernoulli effect, such that the mean axial pressure over the conical rotor end may be less than atmospheric pressure for a given axial clearance, but as the clearance decreases, the hydrostatic effects exceed the Bernoulli effects and the mean axial pressure over the conical rotor end may then exceed atmospheric pressure by a substantial amount. Thus, a self-stabilizing axial bearing is formed with improved stability and stiffness for rotor surface speeds up to at least 80% of the speed of sound. Motive power required to spin the rotor may be provided by a radial-inflow microturbine at the opposite end of the rotor in a way that is readily compatible with automatic sample change.

US Patent:

20110130745, Jun 2, 2011

Filed:

Feb 7, 2011

Appl. No.:

13/022501

Inventors:

Siddarth K. Shevgoor - Sandy UT, US
Bryan Fred Bihlmaier - Provo UT, US
Austin Jason McKinnon - Herriman UT, US
Chad M. Adams - Cedar Hills UT, US

Assignee:

BECTON, DICKINSON AND COMPANY - Franklin Lakes NJ

International Classification:

A61M 25/00

US Classification:

604523

Abstract:

A catheter having a catheter body with a lumen and a distal lumen opening. The catheter's lumen extends through the catheter body along a longitudinal axis of the catheter body. A hole is formed through a wall of a distal portion of the catheter body. A portion of the proximal surface of the hole is inclined at an acute angle with respect to the longitudinal axis of the catheter body. The acute angle of the proximal hole surface opens proximally with respect to the catheter body.

US Patent:

20130053826, Feb 28, 2013

Filed:

Aug 31, 2011

Appl. No.:

13/223178

Inventors:

Siddarth K. Shevgoor - Sandy UT, US

Assignee:

BECTON, DICKINSON AND COMPANY - Franklin Lakes NJ

International Classification:

A61M 25/00
B23P 17/04

US Classification:

604523, 29428

Abstract:

A venous catheter having a catheter tip comprising recessed diffusion holes for increasing the snag-resistance of the venous catheter. The invention further provides systems and methods for providing axial ridges interposed between diffusion holes for increasing the rigidity of the vented catheter tip.

US Patent:

20220355092, Nov 10, 2022

Filed:

May 4, 2021

Appl. No.:

17/307624

Inventors:

- San Diego CA, US
George Mansour - Diamond Bar CA, US
Tomas Frausto - Walnut CA, US
Ali Saleh - Irvine CA, US
Archana Rao - Los Angeles CA, US
Siddarth Shevgoor - Mission Viejo CA, US

International Classification:

A61M 39/22

Abstract:

A needleless connector may include a housing comprising a central longitudinal axis, a body portion, and a base portion. The body portion may include an inner surface forming an internal cavity, and a first port forming a first fluid passage to the internal cavity. The base portion may include a top section including a valve seal support, and a bottom section including a second port forming a second fluid passage to the internal cavity. The needleless connector may further include an asymmetrically-shaped valve disposed in the internal cavity. The asymmetrically-shaped valve may include a head portion, a valve body portion extending distally from the head portion, and a wall having an inner surface forming a valve cavity. The valve may be coupled with the housing such that the inner surface of the valve at the valve body portion is seated and radially supported on the valve seal support.

US Patent:

20220273868, Sep 1, 2022

Filed:

May 17, 2022

Appl. No.:

17/746850

Inventors:

- San Diego CA, US
Janice PAK - Centennial CO, US
Wesley UNDERWOOD - Yorba Linda CA, US
Siddarth K. SHEVGOOR - Mission Viejo CA, US

International Classification:

A61M 5/168
A61M 39/28
A61M 5/14
A61M 5/165
A61M 5/162

Abstract:

Flow controllers for intravenous (IV) tubing are provided. A flow controller may include a first structural member comprising a first outer surface and a first inner surface disposed at an angle to the first outer surface, a second structural member comprising a second outer surface parallel to the first outer surface and a second continuous inner surface parallel to the first inner surface, and a third structural member disposed on one of the first or second structural member and having a friction-reducing surface for at least a portion of a cavity disposed between the first and second structural members. The first structural member is linearly slidable along a length of the IV tubing disposed in the cavity to compress a portion of the IV tubing to control flow of a medical fluid through the IV tubing. Other flow controllers and IV sets that include a flow controller are also provided.

US Patent:

20220233763, Jul 28, 2022

Filed:

Jan 27, 2022

Appl. No.:

17/586602

Inventors:

- San Diego CA, US
Frank Cai - Ontario CA, US
Derek Alan Carroll - Carson CA, US
Siddarth Shevgoor - Mission Viejo CA, US

International Classification:

A61M 5/142
F04B 43/12
A61M 5/168

Abstract:

Peristaltic pumps are described herein. In certain embodiments, a peristaltic pump includes a plunger, a first biasing member, and a second biasing member. The plunger is movable to selectively engage a pumping volume of a tubing segment to expand the pumping volume to draw fluid flow into the pumping volume and to contract the pumping volume to conduct fluid flow from the pumping volume. The first biasing member is configured to urge the plunger toward the tubing segment to maintain contact with the tubing segment during the expansion of the pumping volume. The second biasing member is configured to urge the plunger toward the tubing segment to contract the pumping volume.