1
Eitan T Wiener, Foster Stulen, Ashvani K Madan, Kenneth S Kramer: Output displacement control using phase margin in an ultrasonic surgical hand piece. Ethicon Endo Surgery, January 13, 2004: US06678621 (187 worldwide citation)

An ultrasonic surgical hand piece is caused to be driven with an output displacement that is correlated with the phase margin, which is the difference of the resonant frequency and the anti-resonant frequency of the hand piece. A frequency sweep is conducted to find the resonant frequency and the an ...


2
Ashvani K Madan, Jean M Beaupre: Ultrasonic transducer with improved compressive loading. Ethicon Endo Surgery, Verne E Kreger, December 10, 2002: US06491708 (185 worldwide citation)

An ultrasonic device with increased efficiency as a result of substantially increased pressure uniformity across individual PZTs and through the PZT stack. Specifically, the PZT stack is uniformly compressed by way of a bolt having a head that has a surface area roughly equal to the surface area of ...


3
Ashvani K Madan, Jean M Beaupre, Eitan T Wiener, Foster B Stulen: Apparatus and method for tuning ultrasonic transducers. Ethicon Endo Surgery, Verne E Kreger Jr, August 21, 2001: US06278218 (175 worldwide citation)

A method of manufacturing high power sandwich type ultrasonic transducers and, more particularly, a new method of tuning high power sandwich type ultrasonic transducers without the need for a trimming process. A method in accordance with the present invention includes the steps of assembling a sandw ...


4
Robert G Cook, Richard F Schwemberger, Ashvani K Madan, William T Donofrio, Robert P Gill: Ring contact for rotatable connection of switch assembly for use in a surgical system. Ethicon Endo Surgery, Darby & Darby, September 23, 2003: US06623500 (133 worldwide citation)

The present invention provides a surgical handpiece having a switch end cap detachably and rotatably connected to the handpiece body. A surgical instrument is inserted within the handpiece body so that a portion thereof extends beyond the handpiece body and is actuated to perform a surgical operatio ...


5
Ashvani K Madan, Foster B Stulen, Eitan T Wiener, Karen M Kowalski, Michael J Stokes, Mark E Tebbe, Mark D Mihal, Michael R Lamping: Medical ultrasound system and handpiece and methods for making and tuning. Ethicon Endo Surgery, Thompson Hine, April 10, 2012: US08152825 (92 worldwide citation)

Several embodiments of medical ultrasound handpieces are described each including a medical ultrasound transducer assembly. An embodiment of a medical ultrasound system is described, wherein the medical ultrasound system includes a medical ultrasound handpiece having a medical ultrasound transducer ...


6
Ashvani K Madan: Surgical instrument with ratcheting rotatable shaft. Ethicon Endo Surgery, Frost Brown Todd, May 26, 2015: US09039720 (64 worldwide citation)

An ultrasonic surgical instrument comprises a reusable housing including an internal transducer and an internal end effector rotation assembly. An exemplary rotation assembly is a ratchet and pawl assembly, which allows the transducer to rotate in a first direction but not in a second, opposite dire ...


7
David C Yates, Frederick E Shelton IV, Kevin L Houser, Aron O Zingman, Donna L Korvick, Ashvani K Madan, John W Willis: Surgical instrument with feedback at end effector. Ethicon Endo Surgery, Frost Brown Todd, June 9, 2015: US09050100 (60 worldwide citation)

An apparatus for operating on tissue includes a body, a lip in communication with the body, and at least one electrode also in communication with the body. The body is able to mechanically couple with a portion of an end effector, which may be controlled by a user through a handpiece. The lip is con ...


8
Scott A Nield, Shan Wan, Ashvani K Madan: Transducer arrangements for ultrasonic surgical instruments. Ethicon Endo Surgery, January 1, 2013: US08344596 (58 worldwide citation)

In one general aspect, various embodiments are directed to an ultrasonic surgical instrument that comprises a transducer configured to produce vibrations along a longitudinal axis at a predetermined frequency. In various embodiments, an ultrasonic blade extends along the longitudinal axis and is cou ...


9
David C Yates, Aron O Zingman, Ashvani K Madan, Kevin L Houser, Danius P Silkaitis, William D Dannaher, Timothy G Dietz, Richard W Timm, Robert J Laird, Gavin M Monson: Motor driven electrosurgical device with mechanical and electrical feedback. Ethicon Endo Surgery, October 20, 2015: US09161803 (56 worldwide citation)

An electrosurgical device comprises an end effector, a cutting member, and en electromechanical driver. The end effector comprises a pair of jaws that clamp tissue. The jaws include electrodes that deliver RF energy to clamped tissue. The cutting member cuts tissue clamped between the jaws. The elec ...


10
Eitan T Wiener, Kenneth S Kramer, Foster B Stulen, Ashvani K Madan: Surgical instruments. Ethicon Endo Surgery, August 20, 2013: US08512365 (49 worldwide citation)

A surgical device. The surgical device may comprise a transducer, an end effector, a generator and a control circuit. The transducer may be configured to provide vibrations. The end effector may be coupled to the transducer and may extend from the transducer along the longitudinal axis. The generato ...