Patents by Inventor Mandayam A. Srinivasan
Mandayam A. Srinivasan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240099597Abstract: A method is directed to continuously, non-invasively, and directly measuring blood pressure, and includes providing a calibrated measurement device having a blood-flow control balloon and a sensor array. The method further includes placing the sensor array in a non-invasive manner over the surface of a patch of skin connected to an artery by adjoining soft tissues and inflating the blood-flow control balloon with a controlled amount of pressure. In response to the inflating of the blood-flow control balloon, changes in the artery geometry and forces are detected, via the sensor array, during a heartbeat cycle. The changes correspond to spatio-temporal signals from the artery or in the adjoining soft tissues. The spatio-temporal signals are measured and processed, via a controller, to determine blood-pressure parameters.Type: ApplicationFiled: December 11, 2023Publication date: March 28, 2024Inventors: Mandayam A. SRINIVASAN, Mohan Thanikachalam, Edward Howard Adelson, Abhijit Biswas
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Patent number: 11883140Abstract: A method is directed to continuously, non-invasively, and directly measuring blood pressure, and includes providing a calibrated measurement device having a blood-flow control balloon and a sensor array. The method further includes placing the sensor array in a non-invasive manner over the surface of a patch of skin connected to an artery by adjoining soft tissues and inflating the blood-flow control balloon with a controlled amount of pressure. In response to the inflating of the blood-flow control balloon, changes in the artery geometry and forces are detected, via the sensor array, during a heartbeat cycle. The changes correspond to spatio-temporal signals from the artery or in the adjoining soft tissues. The spatio-temporal signals are measured and processed, via a controller, to determine blood-pressure parameters.Type: GrantFiled: March 29, 2019Date of Patent: January 30, 2024Assignees: Trustees of Tufts College, Massachusetts Institute of TechnologyInventors: Mandayam A. Srinivasan, Mohan Thanikachalam, Edward Howard Adelson, Abhijit Biswas
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Publication number: 20210153755Abstract: A method is directed to continuously, non-invasively, and directly measuring blood pressure, and includes providing a calibrated measurement device having a blood-flow control balloon and a sensor array. The method further includes placing the sensor array in a non-invasive manner over the surface of a patch of skin connected to an artery by adjoining soft tissues and inflating the blood-flow control balloon with a controlled amount of pressure. In response to the inflating of the blood-flow control balloon, changes in the artery geometry and forces are detected, via the sensor array, during a heartbeat cycle. The changes correspond to spatio-temporal signals from the artery or in the adjoining soft tissues. The spatio-temporal signals are measured and processed, via a controller, to determine blood-pressure parameters.Type: ApplicationFiled: March 29, 2019Publication date: May 27, 2021Applicants: Trustees of Tufts College, Massachusetts Institute of TechnologyInventors: Mandayam A. SRINIVASAN, Mohan THANIKACHALAM, Edward Howard ADELSON, Abhijit BISWAS
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Patent number: 7642989Abstract: Systems, methods and computer-executable code stored on computer readable media for synchronizing the evolving state of a dynamic object in a shared virtual environment among a plurality of geographically separated computers connected in a communications network including data communications links introducing time delays in the propagation of data between said computers. The synchronization scheme utilizes an advanced feedback controller to compensate for the state error between sites, comprised of a linear compensator and a Smith predictor based internal model, to determine correct control forces creating a smooth input while maintaining high levels of responsiveness and consistency. A recovery filter for restoring the natural motion of the virtual object distorted by synchronization control is also described.Type: GrantFiled: March 17, 2006Date of Patent: January 5, 2010Assignee: Massachusetts Institute of TechnologyInventors: Joono Cheong, Anuradha M. Annaswamy, Mandayam A. Srinivasan
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Publication number: 20070268248Abstract: A method and apparatus for determining forces to be applied to a user through a haptic interface. The method includes the steps of generating a representation of an object in graphic space, sensing the position of the user in real space and calculating a force to be applied to a user in response to the user's haptic interface and the user's fiducial object. The user's fiducial object represents the location in graphic space at which the user's haptic interface would be located if the haptic interface could not penetrate the surfaces of virtual objects. In one embodiment, the method calculates a stiffness force to be applied to the user. In other embodiments, the method calculates damping and friction forces to be applied to the user. In one embodiment the step of generating a representation of an object in graphic space includes defining the object as a mesh of planar surfaces and associating surface condition values to each of the nodes defining the planar surfaces.Type: ApplicationFiled: April 23, 2007Publication date: November 22, 2007Applicant: Massachusetts Institute of TechnologyInventors: Craig Zilles, J. Salisbury, Thomas Massie, David Brock, Mandayam Srinivasan, Hugh Morgenbesser
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Patent number: 7225404Abstract: A method and apparatus for determining forces to be applied to a user through a haptic interface. The method includes the steps of generating a representation of an object in graphic space, sensing the position of the user in real space and calculating a force to be applied to a user in response to the user's haptic interface and the user's fiducial object. The user's fiducial object represents the location in graphic space at which the user's haptic interface would be located if the haptic interface could not penetrate the surfaces of virtual objects.Type: GrantFiled: October 26, 2001Date of Patent: May 29, 2007Assignee: Massachusetts Institute of TechnologyInventors: Craig B. Zilles, J. Kenneth Salisbury, Jr., Thomas H. Massie, David Lawrence Brock, Mandayam A. Srinivasan, Hugh B. Morgenbesser
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Publication number: 20060256080Abstract: Systems, methods and computer-executable code stored on computer readable media for synchronizing the evolving state of a dynamic object in a shared virtual environment among a plurality of geographically separated computers connected in a communications network including data communications links introducing time delays in the propagation of data between said computers. The synchronization scheme utilizes an advanced feedback controller to compensate for the state error between sites, comprised of a linear compensator and a Smith predictor based internal model, to determine correct control forces creating a smooth input while maintaining high levels of responsiveness and consistency. A recovery filter for restoring the natural motion of the virtual object distorted by synchronization control is also described.Type: ApplicationFiled: March 17, 2006Publication date: November 16, 2006Applicant: Massachusetts Institute of TechnologyInventors: Mandayam Srinivasan, Anuradha Annaswamy, Joono Cheong
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Patent number: 6704694Abstract: A ray-based interaction system and related techniques are described. The ray-based interaction system and rendering techniques can be used to display haptic interactions between objects having one or more dimensions and a haptic probe modeled as a line segment.Type: GrantFiled: October 15, 1999Date of Patent: March 9, 2004Assignee: Massachusetts Institute of TechnologyInventors: Cagatay Basdogan, Chih-Hao Ho, Mandayam A. Srinivasan
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Patent number: 6369834Abstract: A method and apparatus for determining forces to be applied to a user through a haptic interface. The method includes the steps of generating a representation of an object in graphic space, sensing the position of the user in real space and calculating a force to be applied to a user in response to the user's haptic interface and the user's fiducial object. The user's fiducial object represents the location in graphic space at which the user's haptic interface would be located if the haptic interface could not penetrate the surfaces of virtual objects. In one embodiment, the method calculates a stiffness force to be applied to the user. In other embodiments, the method calculates damping and friction forces to be applied to the user. In one embodiment the step of generating a representation of an object in graphic space includes defining the object as a mesh of planar surfaces and associating surface condition values to each of the nodes defining the planar surfaces.Type: GrantFiled: June 2, 1999Date of Patent: April 9, 2002Assignee: Massachusetts Institute of TechnologyInventors: Craig B. Zilles, J. Kenneth Salisbury, Jr., Thomas H. Massie, David Lawrence Brock, Mandayam A. Srinivasan, Hugh B. Morgenbesser
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Patent number: 6111577Abstract: A method and apparatus for determining forces to be applied to a user through a haptic interface. The method includes the steps of generating a representation of an object in graphic space, sensing the position of the user in real space and calculating a force to be applied to a user in response to the user's haptic interface and the user's fiducial object. The user's fiducial object represents the location in graphic space at which the user's haptic interface would be located if the haptic interface could not penetrate the surfaces of virtual objects. In one embodiment, the method calculates a stiffness force to be applied to the user. In other embodiments, the method calculates damping and friction forces to be applied to the user. In one embodiment the step of generating a representation of an object in graphic space includes defining the object as a mesh of planar surfaces and associating surface condition values to each of the nodes defining the planar surfaces.Type: GrantFiled: April 4, 1996Date of Patent: August 29, 2000Assignee: Massachusetts Institute of TechnologyInventors: Craig B. Zilles, J. Kenneth Salisbury, Jr., Thomas H. Massie, David Lawrence Brock, Mandayam A. Srinivasan, Hugh B. Morgenbesser