Patents by Inventor J. Marcus Hollis
J. Marcus Hollis 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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Patent number: 6895266Abstract: An apparatus and method for guiding a surgical instrument within and around the human body. The invention employs a light emitter and an array of light sensors and a display to accurately locate an anatomical feature into which the light emitter has been placed. Laser or LED light emitted from an emitter, conveyed by a light conduit, is detected after passing through a thickness of bone and/or soft tissue by the sensor array. The signal from the sensor array is processed-and information indicating the relative direction of the emitter from the sensor is displayed. The light can be directed by a mirror or by bending the end of the light conduit.Type: GrantFiled: March 26, 2001Date of Patent: May 17, 2005Assignee: Vector Medical Inc.Inventor: J. Marcus Hollis
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Patent number: 6652260Abstract: A press to form a composite acetabular allograft cup for use in hip replacement surgery is disclosed. The acetabular cup formed by the press comprises bone cement and cancellous bone chips. The press includes a two-piece mold for forming the acetabular cup. The mold is removable from the press and may be available in many different sizes to accommodate a range of patients. A screw-type compression means is utilized to force the acetabular cup into the desired shape. A compression gauge allows the operator to monitor the pressure applied as the acetabular cup is formed to prevent excessive crushing of cancellous bone chips. Breaking jaws are used to separate the acetabular cup from the upper portion of the mold after the bone cement has set and the acetabular cup is formed.Type: GrantFiled: June 12, 2001Date of Patent: November 25, 2003Assignee: The Board of Trustees of the University of ArkansasInventors: Carl Nelson, J. Marcus Hollis, Charlene Flahiff
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Publication number: 20020025358Abstract: A press to form a composite acetabular allograft cup for use in hip replacement surgery is disclosed. The acetabular cup formed by the press comprises bone cement and cancellous bone chips. The press includes a two-piece mold for forming the acetabular cup. The mold is removable from the press and may be available in many different sizes to accommodate a range of patients. A screw-type compression means is utilized to force the acetabular cup into the desired shape. A compression gauge allows the operator to monitor the pressure applied as the acetabular cup is formed to prevent excessive crushing of cancellous bone chips. Breaking jaws are used to separate the acetabular cup from the upper portion of the mold after the bone cement has set and the acetabular cup is formed.Type: ApplicationFiled: June 12, 2001Publication date: February 28, 2002Inventors: Carl Nelson, J. Marcus Hollis, Charlene Flahiff
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Patent number: 6293971Abstract: A composite allograft press comprises a loading frame and a two piece mold to form an composite allograft and in particular an acetabular cup from impacted cancellous bone chips and cement. Pressure is applied by a manually operated lever through a rack-and-pinion gear mechanism to a plunger attached to one part of the mold. Compression load switches in-line with the plunger indicate the correct loading to the mold to produce a composite allograft in which the inner surface is smooth and comprised essentially of hardened bone cement material. The outer portion of the allograft may have limited cement extrusions but the exterior of the cup primarily shows exposed cancellous bone surface. In surgery a composite allograft; e.g., an acetabular cup, is fixed in the acetabulum with bone screws to fill an acetabular defect. A plastic liner is affixed with bone cement directly to the composite allograft cup to receive the femoral component.Type: GrantFiled: June 29, 1999Date of Patent: September 25, 2001Assignee: Board of Trustees of the University of ArkansasInventors: Carl Nelson, J. Marcus Hollis, Charlene Flahiff, William Hogue
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Patent number: 6081741Abstract: An apparatus and method for guiding a surgical instrument within and around the human body. During surgery on the body it is often necessary to approach a specific anatomical location precisely and directly in order to minimize unwanted surgical trauma and to place a soft tissue incision or a bone drill hole in an accurate location. The invention employs a light emitter an array of light sensors and a display to accurately locate an anatomical feature into which the light emitter has been placed. The light emitted from the emitter is detected after passing through a thickness of bone and/or soft tissue by the sensor array. The signal from the sensor array is processed and information indicating the relative direction of the emitter from the sensor is displayed. The surgeon then can proceed in the direction indicated.Type: GrantFiled: May 19, 1999Date of Patent: June 27, 2000Assignee: Vector Medical, Inc.Inventor: J. Marcus Hollis
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Patent number: 5981828Abstract: A composite allograft press comprises a loading frame and a two piece mold to form an composite allograft and in particular an acetabular cup from impacted cancellous bone chips and cement. Pressure is applied by a manually operated lever through a rack-and-pinion gear mechanism to a plunger attached to one part of the mold. Compression load switches in-line with the plunger indicate the correct loading to the mold to produce a composite allograft in which the inner surface is smooth and comprised essentially of hardened bone cement material. The outer portion of the allograft may have limited cement extrusions but the exterior of the cup primarily shows exposed cancellous bone surface. In surgery a composite allograft; e.g., an acetabular cup, is fixed in the acetabulum with bone screws to fill an acetabular defect. A plastic liner is affixed with bone cement directly to the composite allograft cup to receive the femoral component.Type: GrantFiled: July 24, 1998Date of Patent: November 9, 1999Assignee: Board of Trustees of the University of ArkansasInventors: Carl Nelson, J. Marcus Hollis, Charlene Flahiff, William Hogue
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Patent number: 5824078Abstract: A composite allograft press comprises a loading frame and a two piece mold to form an composite allograft and in particular an acetabular cup from impacted cancellous bone chips and cement. Pressure is applied by a manually operated lever through a rack-and-pinion gear mechanism to a plunger attached to one part of the mold. Compression load switches in-line with the plunger indicate the correct loading to the mold to produce a composite allograft in which the inner surface is smooth and comprised essentially of hardened bone cement material. The outer portion of the allograft may have limited cement extrusions but the exterior of the cup primarily shows exposed cancellous bone surface. In surgery a composite allograft; e.g., an acetabular cup, is fixed in the acetabulum with bone screws to fill an acetabular defect. A plastic liner is affixed with bone cement directly to the composite allograft cup to receive the femoral component.Type: GrantFiled: March 11, 1996Date of Patent: October 20, 1998Assignee: The Board of Trustees of The University of ArkansasInventors: Carl Nelson, J. Marcus Hollis, Charlene Flahiff, William Hogue
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Patent number: 5402800Abstract: An ankle laxity measurement system for measuring laxity of the ankle and subtalar joint of a patient, includes a foot clamp frame securable to the patient's foot. A reference point is established on the patient's tibia above the patient's ankle. Motion between said foot clamp frame and the reference point is measured in six degrees of freedom. A handle secured to the frame to apply a force which is measured in anterior-posterior and inversion-eversion directions. Signals corresponding to these forces and the six degree of freedom movements are supplied to a computer to compute, record and display the measured motions and loads.Type: GrantFiled: August 2, 1993Date of Patent: April 4, 1995Inventor: J. Marcus Hollis