Mehdi Razavi

US Patent:

8273023, Sep 25, 2012

Filed:

Jan 5, 2009

Appl. No.:

12/348658

Inventors:

Mehdi Razavi - Houston TX, US

Assignee:

Texas Heart Institute - Houston TX

International Classification:

A61B 5/00
A61B 5/04
A61B 5/02

US Classification:

600371, 600373, 600506

Abstract:

An apparatus comprises a sheathe for introducing a catheter into a blood vessel, a first electrode provided on the sheathe, a second electrode; and a measuring device to which the first and second electrodes are coupled. The measuring device measures the impedance or conduction velocity between the first electrode on the sheathe and the second electrode.

US Patent:

8366615, Feb 5, 2013

Filed:

Oct 16, 2009

Appl. No.:

12/581101

Inventors:

Mehdi Razavi - Houston TX, US

Assignee:

Texas Heart Institute - Houston TX

International Classification:

A61B 5/00
A61B 5/04
A61B 5/02

US Classification:

600371, 600373, 600506

Abstract:

An apparatus comprises a sheath for introducing a catheter into a blood vessel, at least one electrode provided on the sheath, at least one other electrode; and a measuring device to which at least one pair of electrodes are coupled. The measuring device measures the impedance or conduction velocity between the first electrode on the sheath and the second electrode.

US Patent:

8527069, Sep 3, 2013

Filed:

May 10, 2011

Appl. No.:

13/104534

Inventors:

Mehdi Razavi - Houston TX, US
Alan Brewer - Houston TX, US

Assignee:

Texas Heart Institute - Houston TX

International Classification:

A61N 1/00
A61B 5/04

US Classification:

607126, 600372, 600509, 607119, 607132

Abstract:

An embodiment includes a sensor coupled to a sternal closure wire. The sternal closure wire holds two sternum portions of a patient adjacent to one another and the first sensor senses a biological signal of the patient. An embodiment includes a current source coupled to a sternal closure wire. The sternal closure wire holds two sternum portions of a patient adjacent to one another, and the current source delivers an electrical current to the patient via the sternal closure wire. Other embodiments are described herein.

US Patent:

20080027488, Jan 31, 2008

Filed:

Jul 26, 2006

Appl. No.:

11/460144

Inventors:

James A. Coles - Columbia MD, US
Michael R. Ujhelyi - Maple Grove MN, US
Mehdi Razavi - Houston TX, US
Vadim Levin - Harleysville PA, US

International Classification:

A61N 1/05

US Classification:

607 9

Abstract:

Herein provided are methods for optimizing the atrio-ventricular (A-V) delay for efficacious delivery of cardiac resynchronization therapy. The A-V delay is set such that pacing-induced left ventricular contraction occurs following completion of left atrial (LA) contraction. This maximizes left ventricular filling (preload) which theoretically results in optimal LV contraction via the Frank-Starling mechanism. In CRT devices, the programmed A-V delay starts with detection of electrical activity in the right atrium (RA). Thus, a major component of the A-V delay is the time required for inter-atrial conduction time (IACT) from the RA to the LA. This IACT can be measured during implantation as the time from the atrial lead stimulation artifact to local electrograms in a coronary sinus (CS) catheter. Assuming that the beginning of LA contraction closely corresponds with the beginning of LA electrical activity, the optimal AV delay should be related to the time between the start of RA electrical activity and the start of LA electrical activity plus the duration of LA atrial contraction. Thus the inventors hypothesized that during atrial pacing the IACT measured at implantation correlated with the echocardiographically defined optimal paced AV delay (PAV).

US Patent:

20080109033, May 8, 2008

Filed:

Oct 30, 2007

Appl. No.:

11/929244

Inventors:

Mehdi Razavi - Houston TX, US

Assignee:

TEXAS HEART INSTITUTE - Houston TX

International Classification:

A61B 17/03

US Classification:

606213000

Abstract:

Methods and devices for prevention of a pneumothorax during vascular access are disclosed herein. The methods utilize a device having a detachable distal portion which serves to block the passageway created after a vascular access procedure. The device may include retention means to secure the device in the passageway. In addition, the methods may make use of tissue adhesives or glues to further ensure sealing of the passage. Furthermore, the disclosed methods and devices may be used to block perforations of blood vessels created during vascular access.

US Patent:

20090112182, Apr 30, 2009

Filed:

Oct 30, 2008

Appl. No.:

12/261688

Inventors:

Mehdi RAZAVI - Houston TX, US

Assignee:

TEXAS HEART INSTITUTE - Houston TX

International Classification:

A61M 29/02

US Classification:

604507, 604104

Abstract:

A vascular access device comprises a bridge having first and second bores therethrough, a dilator in the first bore, and a needle guide in the second bore. The second bore is at an angle with respect to the first bore such that the needle guide is at the angle with respect to the dilator. The device is useful, for example to achieve dual site entrance to a blood vessel.

US Patent:

20090177069, Jul 9, 2009

Filed:

Jan 5, 2009

Appl. No.:

12/348695

Inventors:

Mehdi RAZAVI - Houston TX, US

International Classification:

A61B 5/053

US Classification:

600371, 600547

Abstract:

An apparatus comprises a catheter comprising a first electrode. The apparatus also comprises a second electrode electrically attached to a person and coupled to the first electrode via the person's tissue. Logic is coupled to the electrodes and generates an electrical signal that is provided through the electrodes and computes an impedance or conduction velocity associated with the electrodes based on the electrical signal. The logic stores a threshold against which said computed impedance or conduction velocity is compared by said logic

US Patent:

20110288405, Nov 24, 2011

Filed:

Apr 21, 2011

Appl. No.:

13/091655

Inventors:

MEHDI RAZAVI - Houston TX, US
Gangbing Song - Pearland TX, US
Alireza Nazeri - Houston TX, US
Siu Chun Michael Ho - Sugor Land TX, US

International Classification:

A61B 6/00

US Classification:

600424

Abstract:

In an embodiment, an apparatus comprises a needle (e.g., hypodermic needle or trocar) and sensor (e.g., fiber Braggs grating sensor) coupled to a system to determine (e.g., in real time) stress and/or vibrations encountered by the needle. Consequently, various embodiments may (a) help identify nearby vessels, (b) determine whether the needle penetrated a hollow body structure, and (c) accurately guide needles towards a target structure (e.g., vessel). Other embodiments are described herein.