Jeffrey M Duncan

US Patent:

6379363, Apr 30, 2002

Filed:

Sep 24, 1999

Appl. No.:

09/405245

Inventors:

Stephen Herrington - Orange Park FL
Jeffrey Duncan - Jacksonville FL
Dennis Cirino - Jacksonville FL
Steven Crow - Jacksonville FL

Assignee:

Walter Lorenz Surgical, Inc. - Jacksonville FL

International Classification:

A61B 1700

US Classification:

606 79, 606 72, 606 73, 606104

Abstract:

This invention relates to a set of surgical instruments for use in reattachment of a cranial flap using a cranial clamp having a base, a cap and a stem. The set of surgical instruments includes an applier instrument, a stem holder instrument and a stem cutter instrument. The applier instrument slidably receives a portion of the stem and moves the cap relative to the base. The applier instrument includes a handle, a trigger and a barrel configured as a gun-style instrument, as well as includes an engagement mechanism having a contoured surface that matingly engages a contoured surface on a portion of the stem. The stem holder instrument engages and holds a portion of the stem. The stem holder instrument includes a pair of handles and a lock mechanism that may be locked upon squeezing a pair of handles once and be opened upon squeezing the pair of handles once again. The stem cutter instrument removes a portion of the stem from the cranial clamp. The stem cutter instrument includes a capture mechanism which retains a sheared portion of the stem.

US Patent:

6685707, Feb 3, 2004

Filed:

Sep 25, 2002

Appl. No.:

10/255146

Inventors:

Shawn David Roman - Orange Park FL
Jeffrey Allen Duncan - Jacksonville FL
Derek Sean Lewis - Jacksonville FL
Kevin T. Stone - Winona Lake IN

Assignee:

Walter Lorenz Surgical, Inc. - Jacksonville FL

International Classification:

A61B 1784

US Classification:

606 72, 606 73, 606213

Abstract:

A clamp assembly for repairing a bone defect according to the invention includes a base, a cap opposing the base, and a post connecting the cap and the base in a fastening position on adjacent bone plate and surrounding cranium. The clamp assembly may further include an applier interacting with the post to position the cap and base in the fastening position. A method according to the invention includes placing the base and cap on opposing internal and external surfaces of the bone plate, with a portion of each of the base and cap overlapping a border of junction between the bone plate and surrounding bone. The post is rotated to bring the base and cap to the fastening position. The method may further include removing a distal portion of the post projecting from the cap and leaving a proximal portion of the post projecting from the cap and which can be deformed to secure the base and cap in the fastening position.

US Patent:

7052499, May 30, 2006

Filed:

Feb 22, 2002

Appl. No.:

10/081166

Inventors:

Shon D. Steger - Jacksonville FL, US
Stephen M. Herrington - Orange Park FL, US
Brian S. Schumacher - Jacksonville FL, US
Kevin T. Stone - Jacksonville FL, US
Jeffrey A. Duncan - Jacksonville FL, US

Assignee:

Walter Lorenz Surgical, Inc. - Jacksonville FL

International Classification:

A61B 17/80

US Classification:

606 69

Abstract:

An elongated plate for coupling severed bone regions comprising at least one bridge region, the at least one bridge region terminating in at least two bone fixation regions. The at least two bone fixation regions each contain at least one aperture for receiving a suitable fastening device for securing the elongated plate to the bone regions to be coupled. The bridge region may be configured so as to be easily severed by a suitable severing device such as surgical scissors. The elongated plate and fastening device may be formed from a bio-compatible or bio-resorbable material.

US Patent:

8460345, Jun 11, 2013

Filed:

Mar 25, 2010

Appl. No.:

12/732009

Inventors:

Shon D. Steger - Jacksonville FL, US
Brian S. Schumacher - Orlando FL, US
Jeffrey A. Duncan - Jacksonville FL, US

Assignee:

Biomet Microfixation, LLC - Warsaw IN

International Classification:

A61B 17/80

US Classification:

606280, 606285

Abstract:

A method according to the present disclosure may include determining a load to be supported across separated bone regions by a bridge region of a bone plate. The method may further include determining an acceptable cut force (CF) for the bridge region, determining a cross-sectional area (a) of the bridge region based on the determined load, and determining a height (h) and a width (w) of the bridge region. A bone plate may be provided including a bridge region having the height (h) and width (w) for securing the separated bone regions.

US Patent:

20020062127, May 23, 2002

Filed:

Oct 29, 2001

Appl. No.:

10/047520

Inventors:

Brian Schumacher - Jacksonville FL, US
Kevin Stone - Jacksonville FL, US
Jeffrey Duncan - Jacksonville FL, US

Assignee:

W.L. Lorenz

International Classification:

A61B017/58

US Classification:

606/070000, 606/069000, 606/073000

Abstract:

A system for mandibular reconstruction generally includes an elongated locking plate having a plurality of internally threaded apertures and a plurality of fasteners. Each fastener includes a main body portion having an upper threaded shaft and a lower threaded shaft. The lower threaded shaft is adapted to engage the mandible. Each fastener further includes a removable head portion internally threaded for engaging the upper shaft portion and externally threaded for engaging a selected one of the internally threaded apertures of the locking plate. In the preferred embodiment, the thread leads of the head portion and lower shaft of the main body portion are identical. A method of mandibular osteosynthesis utilizes the system of osteosynthesis and generally comprises the steps of temporarily securing the elongated locking plate to the mandible with at least one fastener by engaging the threads of the lower portion with the mandible and threadably engaging the head with the locking plate, unthreading the head portion from the main body of the fastener to thereby allow displacement of the locking plate from the mandible without removing the fasteners from the mandible, performing a surgical procedure (e.g., removal of a cancerous growth), and re-securing the elongated plate to the fastener with the removable head portion.

US Patent:

20040127908, Jul 1, 2004

Filed:

Dec 12, 2003

Appl. No.:

10/735449

Inventors:

Shawn Roman - Orange Park FL, US
Richard Davis - Hollywood FL, US
Jeffrey Duncan - Jacksonville FL, US
Derek Lewis - Jacksonville FL, US
Kevin Stone - Winona Lake IN, US

International Classification:

A61B017/58

US Classification:

606/072000, 606/073000

Abstract:

A clamp assembly according to the invention can be fixed through an opening between adjacent members. The clamp assembly includes a base, a cap opposing the base, and a post connecting the cap and the base in a fastening position on the adjacent members. The post includes a torque-limiting feature to prevent over tightening of the cap and base. The clamp assembly may further include an applier interacting with the post to position the cap and base in the fastening position. A method according to the invention includes placing the base and cap on opposing internal and external surfaces of the adjacent members. The post is rotated to bring the base and cap to the fastening position, and a torque-limiting feature prevents over tightening. The method may further include removing a distal portion of the post projecting from the cap and leaving a proximal portion of the post projecting from the cap and which can be deformed to secure the base and cap in the fastening position.

US Patent:

20050065521, Mar 24, 2005

Filed:

Nov 3, 2004

Appl. No.:

10/980705

Inventors:

Shon Steger - Jacksonville FL, US
Brian Schumacher - Orlando FL, US
Jeffrey Duncan - Jacksonville FL, US

International Classification:

A61B017/58

US Classification:

606069000

Abstract:

A plate for coupling severed bone regions comprising at least one bridge region, the at least one bridge region terminating in at least two bone fixation regions. The at least two bone fixation regions each contain at least one aperture for receiving a suitable fastening device for securing the plate to the bone regions to be coupled. The bridge region may be configured so as to be easily severed by a suitable severing device such as surgical scissors. The plate and fastening device may be formed from a bio-compatible or bio-resorbable material.

US Patent:

6325803, Dec 4, 2001

Filed:

Sep 10, 1999

Appl. No.:

9/394287

Inventors:

Brian S. Schumacher - Jacksonville FL
Kevin T. Stone - Jacksonville FL
Jeffrey A. Duncan - Jacksonville FL

Assignee:

Walter Lorenz Surgical, Inc. - Jacksonville FL

International Classification:

A61B 1756

US Classification:

606 71

Abstract:

A system for mandibular reconstruction generally includes an elongated locking plate having a plurality of internally threaded apertures and a plurality of fasteners. Each fastener includes a main body portion having an upper threaded shaft and a lower threaded shaft. The lower threaded shaft is adapted to engage the mandible. Each fastener further includes a removable head portion internally threaded for engaging the upper shaft portion and externally threaded for engaging a selected one of the internally threaded apertures of the locking plate. In the preferred embodiment, the thread leads of the head portion and lower shaft of the main body portion are identical. A method of mandibular osteosynthesis utilizes the system of osteosynthesis and generally comprises the steps of temporarily securing the elongated locking plate to the mandible with at least one fastener by engaging the threads of the lower portion with the mandible and threadably engaging the head with the locking plate, unthreading the head portion from the main body of the fastener to thereby allow displacement of the locking plate from the mandible without removing the fasteners from the mandible, performing a surgical procedure (e. g. , removal of a cancerous growth), and re-securing the elongated plate to the fastener with the removable head portion.