Patents by Inventor Laurence E. Dahners

Laurence E. Dahners 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).

  • Publication number: 20150112355
    Abstract: A fastening apparatus includes a fastener and a fastener receiving member, the apparatus enabling the fastener to be affixed to the fastener receiving member at a variable insertion angle selected by the user and providing an anti-unscrewing feature. The fastener includes an elongate section and an adjoining head section having a slot therein. The fastener receiving member includes one or more apertures having a contact region through which one or more corresponding fasteners can be inserted. The contact region includes a matrix of protrusions having a density and strength sufficient to render contact region tappable by the thread of the head section of the fastener. The thread on the head section is driven into the contact region at the selected insertion angle. As a result, the protrusions project into the at least one slot preventing the fastener from backing out from fastener receiving member. A fastener driver is also disclosed.
    Type: Application
    Filed: October 15, 2014
    Publication date: April 23, 2015
    Inventors: Laurence E. Dahners, Nicholas F. Warner
  • Patent number: 8870931
    Abstract: A fastening apparatus includes a fastener and a fastener receiving member. The apparatus enables the fastener to be affixed to the fastener receiving member at a variable insertion angle selected by the user and further provides an anti-unscrewing feature. The fastener includes an elongate section and an adjoining head section having at least one slot therein. The fastener receiving member includes one or more apertures having a contact region through which one or more corresponding fasteners can be inserted. The contact region includes a matrix of protrusions having a density and strength sufficient to render contact region tappable by the thread of the head section of the fastener. The thread on the head section is driven into the contact region at the selected insertion angle. As a result, the protrusions project into the at least one slot to prevent the fastener from backing out of the fastener receiving member. A fastener driver is also disclosed.
    Type: Grant
    Filed: March 21, 2007
    Date of Patent: October 28, 2014
    Assignees: The University of North Carolina at Chapel Hill, AngleFix Tech, LLC
    Inventors: Laurence E. Dahners, Nicholas F. Warner
  • Patent number: 8764764
    Abstract: A plate puller device can include a head portion and extension rod portion. The device enables the fastener receiving member to be pulled against a bone surface before a head section of the fastener is advanced within the fastener receiving member into a locked position. The head portion can be positioned between the head section of the fastener and a surface of the fastener receiving member not adjacent to the bone surface. Also, a plate puller device can include a screwdriver, a grasper portion and a grasper sleeve. The grasper portion and grasper sleeve can be threadingly mated wherein rotation of the grasper sleeve forces a head portion of the grasper portion to grip the head section of the fastener to prevent the head section from advancing within the fastener receiving member.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: July 1, 2014
    Assignee: The University of North Carolina at Chapel Hill
    Inventor: Laurence E. Dahners
  • Patent number: 8763499
    Abstract: Screw driver-holder apparatuses, systems and methods are provided and can include a screw and a screwdriver. The screw can include a threaded screw body and a screw head, and the screw head can include a socket and a screw head surface surrounding the socket. The screwdriver can include a hollow sleeve with a longitudinal bore and a first end defining a screw engagement surface and a driving shaft positioned within the longitudinal bore of the hollow sleeve and rotatable relative to the hollow sleeve. The driving shaft can further include a first end extending beyond the first end of the hollow sleeve, a second end opposite the first end, and a stop restricting axial movement of the sleeve towards the second end of the driving shaft. The first end can include a protruding tip adapted for engaging the socket of the screw head.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: July 1, 2014
    Assignee: The University of North Carolina at Chapel Hill
    Inventor: Laurence E. Dahners
  • Publication number: 20080240884
    Abstract: A locking device is provided that includes a nut having a body portion and an end portion. The end portion has a proximal end proximate to the body portion and a distal end. The nut has an inner surface defining a nut aperture that extends through the body portion and the end portion with the inner surface of the nut being at least partially threaded. The locking device also includes a bolt having a head and a body. The head of the bolt defines a head aperture therein that extends into the body of the bolt. The body of the bolt is at least partially threaded to matingly engage the threaded inner surface of the nut. The body also defines at least one slot therein that is in communication with the head aperture. Slats are disposed along the distal end of the end portion of the nut. The slats are configured to engage the at least one slot defined in the body of the bolt.
    Type: Application
    Filed: March 27, 2007
    Publication date: October 2, 2008
    Inventor: Laurence E. Dahners
  • Publication number: 20080234677
    Abstract: A fastening apparatus includes a fastener and a fastener receiving member. The apparatus enables the fastener to be affixed to the fastener receiving member at a variable insertion angle selected by the user and further provides an anti-unscrewing feature. The fastener includes an elongate section and an adjoining head section having at least one slot therein. The fastener receiving member includes one or more apertures having a contact region through which one or more corresponding fasteners can be inserted. The contact region includes a matrix of protrusions having a density and strength sufficient to render contact region tappable by the thread of the head section of the fastener. The thread on the head section is driven into the contact region at the selected insertion angle. As a result, the protrusions project into the at least one slot to prevent the fastener from backing out of the fastener receiving member. A fastener driver is also disclosed.
    Type: Application
    Filed: March 21, 2007
    Publication date: September 25, 2008
    Inventors: Laurence E. Dahners, Nicholas F. Warner
  • Publication number: 20080234752
    Abstract: A plate puller device can include a head portion and extension rod portion. The device enables the fastener receiving member to be pulled against a bone surface before a head section of the fastener is advanced within the fastener receiving member into a locked position. The head portion can be positioned between the head section of the fastener and a surface of the fastener receiving member not adjacent to the bone surface. Also, a plate puller device can include a screwdriver, a grasper portion and a grasper sleeve. The grasper portion and grasper sleeve can be threadingly mated wherein rotation of the grasper sleeve forces a head portion of the grasper portion to grip the head section of the fastener to prevent the head section from advancing within the fastener receiving member.
    Type: Application
    Filed: June 13, 2007
    Publication date: September 25, 2008
    Inventor: Laurence E. Dahners
  • Patent number: 6955677
    Abstract: A fastening apparatus includes a fastener and a fastener receiving member. The apparatus enables the fastener to be affixed to the fastener receiving member at a variable insertion angle selected by the user. The fastener includes an elongate section and an adjoining head section. Both the elongate section and the head section are threaded. The fastener receiving member includes one or more apertures through which one or more corresponding fasteners can be inserted. Each aperture includes a contact region formed or disposed on an inside surface defining the aperture. The contact region includes a porous matrix of protrusions or fiber metal having a density and strength sufficient to render contact region tappable by the thread of the head section of the fastener. The thread on the head section is driven into the contact region at the selected insertion angle.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: October 18, 2005
    Assignee: The University of North Carolina at Chapel Hill
    Inventor: Laurence E. Dahners
  • Publication number: 20040111090
    Abstract: An intrafocal plate for securing bone fractures comprising a plate element having a flat surface at one end thereof defining a top and a bottom and a leading end and a trailing end. A longitudinally extending resilient body element is connected at one end thereof adjacent to but spaced apart from the trailing end of the flat surface so as to define an overhanging heel between the resilient body element and the trailing end of the flat surface. The body element is formed so as to extend generally in the lengthwise direction of the flat surface and so as the other end of the body element defines a pin element. The overhanging heel formed between the juncture of the body element and the plate element and the trailing edge of the plate element serves to prevent over reduction of a fracture and to generally stabilize the intrafocal plate when inserted into a fracture site of a bone.
    Type: Application
    Filed: September 25, 2003
    Publication date: June 10, 2004
    Applicant: The University of North Carolina at Chapel Hill
    Inventor: Laurence E. Dahners
  • Publication number: 20040073218
    Abstract: A fastening apparatus includes a fastener and a fastener receiving member. The apparatus enables the fastener to be affixed to the fastener receiving member at a variable insertion angle selected by the user. The fastener includes an elongate section and an adjoining head section. Both the elongate section and the head section are threaded. The fastener receiving member includes one or more apertures through which one or more corresponding fasteners can be inserted. Each aperture includes a contact region formed or disposed on an inside surface defining the aperture. The contact region includes a porous matrix of protrusions or fiber metal having a density and strength sufficient to render contact region tappable by the thread of the head section of the fastener. The thread on the head section is driven into the contact region at the selected insertion angle.
    Type: Application
    Filed: October 15, 2002
    Publication date: April 15, 2004
    Applicant: The University of North Carolina at Chapel Hill
    Inventor: Laurence E. Dahners
  • Patent number: 6379359
    Abstract: An intrafocal plate and method of use for securing bone fractures comprising an elongated plate element having a flat plate surface at one end thereof defining a top surface and a bottom surface and a leading end and a trailing end. A longitudinally extending resilient body element depends from the trailing end of the flat plate surface so as to define a shoulder at the juncture of the body element and the flat plate surface and a pin at the other end of the body element. The intrafocal plate is formed so that a force applied at the pin end causes a force to be applied in the opposite direction at the flat plate surface. The intrafocal plate is particularly intended for use to secure metaphyseal bone fractures by having the body element of the intrafocal plate inserted into the tubular hollow of the bone through the fracture site so as to cause the shoulder of the intrafocal plate to seat in the fracture site and urge the flat plate surface of the plate element against the outside surface of the bone.
    Type: Grant
    Filed: May 5, 2000
    Date of Patent: April 30, 2002
    Assignee: University of North Carolina at Chapel Hill
    Inventor: Laurence E. Dahners
  • Patent number: 5162039
    Abstract: A distraction and reduction device includes a main support bar having a saddle at one end thereof for engagement with the patient's groin or axilla. A support arm is mounted on the support bar and supports a force applying unit. The force applying unit is connected to a means for engaging the body and applies a distally directed force to the patient's limb to distract the bone fragments. As distraction force is being applied to the fractured limb, the saddle presses into the patient's groin or axilla thereby providing resistance against the traction force. The invention also includes a fracture reducing unit which is used to selectively apply pressure to the limb at the location of the fracture to correct any misalignment of the bone fragments.
    Type: Grant
    Filed: January 21, 1992
    Date of Patent: November 10, 1992
    Inventor: Laurence E. Dahners