Cross pin fixator for bone fragments and use thereof
Inventors
Assignees
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Publication Number
US-10898250-B2
Publication Date
2021-01-26
Expiration Date
Abstract
The present application relates to a cross pin fixator device comprising a plate member with spherical cavities that are open to the front and to the back of the plate, collapsible pin holder members having a central channel for insertion of a bone pin, the collapsible pin holder member being press-fit into the spherical cavities, and bone pins individually inserted into the central channel of a pin holder. The application also relates to a method for treating a fracture of the proximal humerus using the proximal humerus cross pin fixator and to a kit for treating a fracture of a bone.
Core Innovation
The invention provides a cross pin fixator device that includes a plate having a front, a back, and one or more sides. The plate includes a plurality of spherical cavities that are open to the front and to the back of the plate, and each spherical cavity comprises a collapsible pin holder disposed therein and associated therewith. Each collapsible pin holder includes a central channel for insertion of a bone pin and can include a compression gap extending longitudinally therethrough from a top opening to a bottom opening therein.
A side of the plate comprises a threaded hole extending therethrough, configured for threadedly engaging a set screw. The set screw contacts a respective collapsible pin holder disposed in a respective spherical cavity from a side of the plate through the threaded hole and immobilize or deform the respective collapsible pin holder. The plate ridges are configured to retain the collapsible pin holder in the plate, and the collapsible pin holder is configured to freely rotate inside the spherical cavity.
A method is described for treating a fracture of a proximal humerus in a patient. The method includes inserting first ends of a plurality of bone pins through the fracture site in a multi-angle and multi-planar configuration to secure fractured bone segments against rotation and axial movement, and inserting second ends through respective collapsible pin holders. The collapsible pin holders are press-fitting into respective spherical cavities of the fixator plate, and contacting the collapsible pin holders from the side of the fixator plate with one or more set screws through threaded holes to immobilize or deform the collapsible pin holders.
Claims Coverage
The document includes two independent claims. The inventive features focus on a plate with front/back-open spherical cavities holding collapsible pin holders, and side-mounted set screws via threaded holes to immobilize or deform the collapsible pin holders in the spherical cavities, together with a method for inserting bone pins in a multi-angle and multi-planar configuration.
Front and back open spherical cavities with collapsible pin holders
A plate having a front, a back, and one or more sides includes a plurality of spherical cavities open to the front and to the back, each spherical cavity comprising a collapsible pin holder disposed therein and associated therewith, including a central channel for insertion of a bone pin and a compression gap extending longitudinally therethrough.
Side threaded holes and set screw to immobilize or deform
A side of the plate comprises a threaded hole extending therethrough configured for threadedly engaging a set screw so as to contact a respective collapsible pin holder disposed in a respective spherical cavity from a side of the plate through the threaded hole and immobilize or deform the respective collapsible pin holder.
Multi-angle and multi-planar bone pin configuration for fracture stability
Inserting each first end of a plurality of bone pins through the fracture site such that the bone pins traverse the site of the bone fracture in a multi-angle and multi-planar configuration to secure fractured bone segments against rotation and axial movement.
Press-fitting collapsible pin holders into spherical cavities retained by ridges
Inserting each second end of each bone pin through a respective collapsible pin holder of a proximal humerus cross pin fixator device, wherein each collapsible pin holder comprises a central channel and a compression gap extending longitudinally therethrough, and press-fitting each collapsible pin holder into a respective spherical cavity of the fixator plate, retained in the fixator plate by a corresponding ridge and configured to freely rotate inside the spherical cavity.
Set screw contact through threaded holes to immobilize or deform in situ
Contacting the collapsible pin holders from the side of the fixator plate with one or more set screws that contact through one or more threaded holes and immobilize or deform the collapsible pin holders in the spherical cavities.
Across the independent claims, the coverage is centered on a proximal humerus cross pin fixator having a plate with front/back-open spherical cavities that house collapsible pin holders with a central channel and a compression gap, press-fit into the spherical cavities and retained by ridges for free rotation. The method and device both rely on side-contact set screws engaging threaded holes to immobilize or deform the collapsible pin holders, while bone pins are inserted in a multi-angle and multi-planar configuration to secure fractured bone segments against rotation and axial movement.
Stated Advantages
Documented Applications
No documented applications found
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