Patents by Inventor John P. Lunsford
John P. Lunsford 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: 20090023986Abstract: Apparatus and method for harvesting selected vessels in the body of a patient include manual manipulation of a rigid dissecting endoscope and the reconfiguration thereof to facilitate tissue dissection and tissue dilation in the formation of an anatomical space about the vessel within which side-branch vessels may be manipulated in preparation for severance and removal of the vessel from the anatomical space.Type: ApplicationFiled: September 8, 2008Publication date: January 22, 2009Inventors: Michael C. Stewart, Liming Lau, Michael Wei, John P. Lunsford, Albert K. Chin, Peter Tachi Callas, Benjamin Sherman
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Patent number: 7479104Abstract: Organ manipulation devices for atraumatically grasping the surface of an organ and repositioning the organ to allow access to a location on the organ that would otherwise be substantially inaccessible. Methods of accessing a beating heart, retracting the heart using an organ manipulation apparatus, and stabilizing a surgical target area with a stabilizer. Both the organ manipulator and stabilizer are fixed to a stationary object which may be a sternal retractor. A system for performing beating heart coronary artery bypass grafting includes a sternal retractor, organ manipulator and stabilizer.Type: GrantFiled: July 8, 2003Date of Patent: January 20, 2009Assignee: MAQUET Cardiovascular, LLCInventors: Liming Lau, John P. Lunsford
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Patent number: 7476198Abstract: A retractor and a surgical tool are positioned within a cannula, and a dissection cradle of the retractor is positioned at the distal end of the cannula. The retractor includes a dissection cradle that is resiliently supported along an axis skewed relative to the axis of the cannula. The dissection cradle, in operation, is extended to cradle the target vessel, and the retractor may be fully extended to urge the vessel away from the axis of the cannula to isolate a side branch for exposure to a surgical tool. The retractor includes a hollow support and a spray nozzle disposed in the distal end of the retractor to form an irrigation system and lens washer that can be selectively positioned to direct the spray of irrigation fluid at a remote surgical site or at an endoscopic lens.Type: GrantFiled: August 24, 2004Date of Patent: January 13, 2009Assignee: Maquet Cardiovascular, LLCInventors: Albert K. Chin, John P. Lunsford, Tenny Chang, Jeffrey W. Baxter
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Publication number: 20080132892Abstract: Surgical apparatus includes bipolar electrodes and tissue-shearing blades configured to electrically contact tissue for electrocauterization thereof prior to shearing contact of the cutting blades with the tissue over wide angles of presentation of the tissue to the electrodes and blades. Extensions or protrusions disposed along facing edges of the electrodes separate the level at which tissue is electrically contacted by the electrodes from the level at which tissue is sheared by the cutting blades.Type: ApplicationFiled: February 11, 2008Publication date: June 5, 2008Applicant: MAQUET CARDIOVASCULAR LLCInventors: John P. Lunsford, Michael C. Stewart
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Patent number: 7344536Abstract: Surgical apparatus includes bipolar electrodes and tissue-shearing blades configured to electrically contact tissue for electrocauterization thereof prior to shearing contact of the cutting blades with the tissue over wide angles of presentation of the tissue to the electrodes and blades. Extensions or protrusions disposed along facing edges of the electrodes separate the level at which tissue is electrically contacted by the electrodes from the level at which tissue is sheared by the cutting blades.Type: GrantFiled: May 21, 2004Date of Patent: March 18, 2008Assignee: Origin Medsystems, Inc.Inventors: John P Lunsford, Michael C Stewart
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Patent number: 7326178Abstract: A retractor and a surgical tool are positioned within a cannula, and a dissection cradle of the retractor is positioned at the distal end of the cannula. The retractor includes a first portion with an axis approximately parallel to the axis of the cannula and a second portion with an axis that can be skewed relative to the axis of the cannula. The dissection cradle is located at the distal end of the second portion of the retractor, and may include two substantially parallel, spaced legs with the retractor shaped in a loop between and in a plane skewed relative to the axes of the legs, and with the loop directed away from the surgical tool. Thus, in operation, a surgeon locates a vessel and side branch of interest and extends the retractor to cradle the vessel in the dissection cradle. Once cradled, the retractor may be deflected to urge the vessel away from the axis of the cannula to isolate the side branch for exposure to the surgical tool.Type: GrantFiled: March 22, 2004Date of Patent: February 5, 2008Assignee: Origin Medsystems, Inc.Inventors: John P. Lunsford, Charles J. Adam, John W. Davis, Albert K. Chin
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Patent number: 7276075Abstract: A sliding gas-tight seal on an access port promotes insufflation of an anatomical space formed in tissue at a surgical site only during insertion of an endoscopic instrument through the access port into the anatomical space, and promotes deflation of the inflated space upon removal of the endoscopic instrument from within the access port. An inflatable balloon disposed about the port near the distal end may be selectively expanded to seal and anchor the access port within an incision through which a surgical procedure with insufflation is to be performed. Multiple resilient seals may be attached to the body of the port, and an auxiliary resilient seal may be inserted within the aperture of a seal attached to the body to accommodate a wide range of endoscopic instruments of various exterior dimensions inserted through the seals.Type: GrantFiled: November 10, 2003Date of Patent: October 2, 2007Assignee: Origin Medsystems, Inc.Inventors: Peter Callas, John P. Lunsford, Albert K. Chin, Michael Wei
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Patent number: 6976957Abstract: A retractor and a surgical tool are positioned within a cannula, and a dissection cradle of the retractor is positioned at the distal end of the cannula. The retractor includes a dissection cradle that is resiliently supported along an axis skewed relative to the axis of the cannula. The dissection cradle, in operation, is extended to cradle the target vessel, and the retractor may be fully extended to urge the vessel away from the axis of the cannula to isolate a side branch for exposure to a surgical tool. The retractor includes a hollow support and a spray nozzle disposed in the distal end of the retractor to form an irrigation system and lens washer that can be selectively positioned to direct the spray of irrigation fluid at a remote surgical site or at an endoscopic lens.Type: GrantFiled: February 6, 2004Date of Patent: December 20, 2005Assignee: Origin Medsystems, Inc.Inventors: Albert K. Chin, John P. Lunsford, Tenny Chang, Jeffrey W. Baxter
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Patent number: 6830546Abstract: A retractor and a surgical tool are positioned at the distal end of the cannula. A dissection cradle is located at the distal end of a distal portion of the retractor that is resiliently skewed relative to the cannula axis, and includes two substantially parallel, spaced legs with the retractor shaped in a loop therebetween. The procedure includes locating a vessel and side branch of interest and extending the retractor to retain the vessel in the dissection cradle to urge the vessel away from the axis of the cannula in order to isolate a side branch for exposure to the surgical tool.Type: GrantFiled: January 16, 2002Date of Patent: December 14, 2004Assignee: Origin Medsystems, Inc.Inventors: Albert K. Chin, Edwin J. Hlavka, John P. Lunsford, Jeffrey W. Baxter
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Patent number: 6814696Abstract: An assembly of cannula and endoscope and dissection tip facilitate surgical procedures at remote surgical site in tissue of a patient. Relative rotation of the cannula about the endoscope from clamped rotational fixation of the cannula and endoscope is made possible by flexing a resilient clamping segment, and such relative rotation promotes convenient positioning of an eccentric tissue-dissecting tip about a vessel being harvested from within tissue of a patient. Color tinting of the tip or color-tinted illumination of tissue at a remote surgical site enhances contrasting visualization through the tip via the endoscope among the tissue types encountered at the surgical site within a patient. A tool bridge or lateral support mounts to a more rigid component such as an endoscope that extends from the proximal end of a cannula to support a more flexible surgical instrument also extending from the proximal end of the cannula.Type: GrantFiled: September 6, 2002Date of Patent: November 9, 2004Assignee: Origin Medsystems, Inc.Inventors: Tenny Chang, Charles Gresl, Harry Ino, Liming Lau, John P. Lunsford, Michael Wei
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Patent number: 6811546Abstract: A sliding gas-tight seal on an access port promotes insufflation of an anatomical space formed in tissue at a surgical site only during insertion of an endoscopic instrument through the access port into the anatomical space, and promotes deflation of the inflated space upon removal of the endoscopic instrument from within the access port. An inflatable balloon disposed about the port near the distal end may be selectively expanded to seal and anchor the access port within an incision through which a surgical procedure with insufflation is to be performed. Multiple resilient seals may be attached to the body of the port, and an auxiliary resilient seal may be inserted within the aperture of a seal attached to the body to accommodate a wide range of endoscopic instruments of various exterior dimensions inserted through the seals.Type: GrantFiled: August 25, 2000Date of Patent: November 2, 2004Assignee: Origin Medsystems, Inc.Inventors: Peter Callas, John P. Lunsford, Albert K. Chin, Michael Wei
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Patent number: 6752756Abstract: A retractor and a surgical tool are positioned within a cannula, and a dissection cradle of the retractor is positioned at the distal end of the cannula. The retractor includes a first portion with an axis approximately parallel to the axis of the cannula and a second portion with an axis skewed relative to the axis of the cannula. The dissection cradle is located at the distal end of the second portion of the retractor, and may include two substantially parallel, spaced legs with the retractor shaped in a loop between and in a plane skewed relative to the axes of the legs, and with the loop directed away from the surgical tool. Thus, in operation, when the surgeon locates a vessel and side branch of interest, the surgeon extends the retractor to cradle the vessel in the dissection cradle. Once cradled, the retractor may be fully extended to urge the vessel away from the axis of the cannula to isolate the side branch for exposure to the surgical tool.Type: GrantFiled: August 12, 2002Date of Patent: June 22, 2004Assignee: Origin Medsystems, Inc.Inventors: John P. Lunsford, Charles J. Adam, John W. Davis, Albert K. Chin
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Patent number: 6749609Abstract: Surgical apparatus includes bipolar electrodes and tissue-shearing blades configured to electrically contact tissue for electrocauterization thereof prior to shearing contact of the cutting blades with the tissue over wide angles of presentation of the tissue to the electrodes and blades. Extensions or protrusions disposed along facing edges of the electrodes separate the level at which tissue is electrically contacted by the electrodes from the level at which tissue is sheared by the cutting blades.Type: GrantFiled: February 5, 2002Date of Patent: June 15, 2004Assignee: Origin Medsystems, Inc.Inventors: John P. Lunsford, Michael C. Stewart
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Publication number: 20030236544Abstract: An apparatus for tissue dissection and instrument anchoring, including a dissection balloon having a viewing window (preferably a rigid, transparent window) at its distal end, or including an anchoring or dissection balloon having nonuniform elasticity selected to achieve desired inflated shape and pressure characteristics, and methods for using such apparatus. The window, which can be a lens (such as a wide angle lens), is transparent and either rigid or non-rigid but sufficiently strong to retain a desired optical shape while (and after) being pushed against tissue layers by a rigid instrument deployed within the balloon. In preferred embodiments, the balloon is a long-necked dissection balloon deployed through a cannula.Type: ApplicationFiled: March 19, 2003Publication date: December 25, 2003Inventors: John p. Lunsford, Charles Gresl, Jeffrey A. Smith, Daniel T. Wallace, Albert K. Chin
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Publication number: 20030032861Abstract: A retractor and a surgical tool are positioned within a cannula, and a dissection cradle of the retractor is positioned at the distal end of the cannula. The retractor includes a first portion with an axis approximately parallel to the axis of the cannula and a second portion with an axis skewed relative to the axis of the cannula. The dissection cradle is located at the distal end of the second portion of the retractor, and may include two substantially parallel, spaced legs with the retractor shaped in a loop between and in a plane skewed relative to the axes of the legs, and with the loop directed away from the surgical tool. Thus, in operation, when the surgeon locates a vessel and side branch of interest, the surgeon extends the retractor to cradle the vessel in the dissection cradle. Once cradled, the retractor may be fully extended to urge the vessel away from the axis of the cannula to isolate the side branch for exposure to the surgical tool.Type: ApplicationFiled: August 12, 2002Publication date: February 13, 2003Inventors: John P. Lunsford, Charles J. Adam, John W. Davis, Albert K. Chin
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Publication number: 20020183593Abstract: A retractor and a surgical tool are positioned within a cannula, and a dissection cradle of the retractor is positioned at the distal end of the cannula. The retractor includes a dissection cradle that is resiliently supported along an axis skewed relative to the axis of the cannula. The dissection cradle, in operation, is extended to cradle the target vessel, and the retractor may be fully extended to urge the vessel away from the axis of the cannula to isolate a side branch for exposure to a surgical tool. The retractor includes a hollow support and a spray nozzle disposed in the distal end of the retractor to form an irrigation system and lens washer that can be selectively positioned to direct the spray of irrigation fluid at a remote surgical site or at an endoscopic lens.Type: ApplicationFiled: June 17, 2002Publication date: December 5, 2002Inventors: Albert K. Chin, John P. Lunsford, Tenny Chang, Jeffrey W. Baxter
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Patent number: 6471638Abstract: An assembly of cannula and endoscope and dissection tip facilitate surgical procedures at remote surgical site in tissue of a patient. Relative rotation of the cannula about the endoscope from clamped rotational fixation of the cannula and endoscope is made possible by flexing a resilient clamping segment, and such relative rotation promotes convenient positioning of an eccentric tissue-dissecting tip about a vessel being harvested from within tissue of a patient. Color tinting of the tip or color-tinted illumination of tissue at a remote surgical site enhances contrasting visualization through the tip via the endoscope among the tissue types encountered at the surgical site within a patient. A tool bridge or lateral support mounts to a more rigid component such as an endoscope that extends from the proximal end of a cannula to support a more flexible surgical instrument also extending from the proximal end of the cannula.Type: GrantFiled: April 28, 2000Date of Patent: October 29, 2002Assignee: Origin Medsystems, Inc.Inventors: Tenny Chang, Charles Gresl, Harry Ino, Liming Lau, John P. Lunsford, Michael Wei
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Patent number: 6432044Abstract: A retractor and a surgical tool are positioned within a cannula, and a dissection cradle of the retractor is positioned at the distal end of the cannula. The retractor includes a first portion with an axis approximately parallel to the axis of the cannula and a second portion with an axis skewed relative to the axis of the cannula. The dissection cradle is located at the distal end of the second portion of the retractor, and may include two substantially parallel, spaced legs with the retractor shaped in a loop between and in a plane skewed relative to the axes of the legs, and with the loop directed away from the surgical tool. Thus, in operation, when the surgeon locates a vessel and side branch of interest, the surgeon extends the retractor to cradle the vessel in the dissection cradle. Once cradled, the retractor may be fully extended to urge the vessel away from the axis of the cannula to isolate the side branch for exposure to the surgical tool.Type: GrantFiled: January 25, 2000Date of Patent: August 13, 2002Assignee: Origin Medsystems, Inc.Inventors: John P. Lunsford, Charles J. Adam, John W. Davis, Albert K. Chin
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Patent number: 6406425Abstract: A retractor and a surgical tool are positioned within a cannula, and a dissection cradle of the retractor is positioned at the distal end of the cannula. The retractor includes a first portion with an axis approximately parallel to the axis of the cannula and a second portion with an axis skewed relative to the axis of the cannula. The dissection cradle may include two substantially parallel, spaced legs with the retractor shaped in a loop between and in a plane skewed relative to the axes of the legs, and with the loop directed away from the surgical tool. Thus, in operation, when a surgeon locates a vessel and side branch of interest, the surgeon extends the retractor to cradle the vessel in the dissection cradle. Once cradled, the retractor may be fully extended to urge the vessel away from the axis of the cannula to isolate the side branch for exposure to a surgical tool.Type: GrantFiled: August 8, 2000Date of Patent: June 18, 2002Assignee: Origin MedasystemsInventors: Albert K. Chin, John P. Lunsford, Tenny Chang, Jeffrey W. Baxter
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Patent number: 6361543Abstract: An apparatus and method for separating a first layer of tissue from a second layer of tissue. An inflatable balloon is mounted to a delivery device. The inflatable balloon has a first, inwardly-displaced portion which everts when the balloon is inflated. The balloon is inserted into a patient between the first and second tissue layers when the balloon is in the deflated state. The balloon is then inflated so that the first portion is everted thereby minimizing trauma to the tissue layers.Type: GrantFiled: March 18, 1997Date of Patent: March 26, 2002Assignee: Sherwood Services AGInventors: Albert K. Chin, Jeffrey A. Smith, John P. Lunsford, Frederic H. Moll