The present disclosure relates to surgical devices, and more particularly, stabilization systems, for example, for trauma applications.
Bone fractures are often repaired by internal fixation of the bone, such as diaphyseal bone, using one or more plates. The plate is held against the fractured bone with screws, for example, which engage the bone and heads which provide a compressive force against the plate. The plate and bone are thus forced against each other in a manner that transfers load primarily between a bone contacting surface of the plate and the bone surface to reinforce the fractured bone during healing. This manner of plating generally creates relatively low stress concentration in the bone, as there may be a large contact area between the plate and the diaphyseal bone surface permitting transfer of load to be dispersed. There may be a desire to use locking screws, non-locking screws, or a combination of both that are able to compress the bone. Of course, the designs of the plates, types of screws, and locking and/or non-locking capabilities may vary based on the location and type of fracture.
In some cases, plates having polyaxial holes may be used to provide increased flexibility with regards to screw orientation. However, with such polyaxial holes, locking of the screw may be difficult. As such, features may be included in the holes to provide surfaces against which the screw can lock. However, there is a need for a method for aligning a drill bit to the nominal axis of a polyaxial hole and locking the drill guide in such a hole without compromising the structure of the hole. Such a hole cannot be threaded into via a threaded drill guide because doing so would jeopardize the locking capabilities of the polyaxial hole.
To meet this and other needs, devices, systems, and methods for locking a drill guide into a polyaxial hole while maintaining the form and function of the polyaxial hole are provided herein. In some embodiments, the drill guide includes a hollow outer body extending from a proximal end to a distal end and having a slot disposed proximate the proximate end, wherein the distal end is configured as a reverse collet having a plurality of prongs; an inner body having a central channel extending therethrough; and a lever coupled to the inner body through the slot, wherein the slot is shaped such that rotation of the lever results in motion along a central axis of the drill guide, and wherein a distal end of the inner body is configured to prevent radially inward deflection of the plurality of prongs when the inner body is in a lowermost position.
In some embodiments, a method of locking a drill guide in a hole includes inserting the drill guide into the hole; pushing the distal end of the outer body beyond a shoulder of the hole, wherein the shoulder pushes the plurality of prongs radially inwardly upon contact, and wherein the plurality of prongs return to a resting position after the distal end is pushed beyond the shoulder; and rotating the lever to move the inner body to a lowermost position in which a distal end of the inner body is disposed between the plurality of prongs to prevent radially inward deflection of the plurality of prongs.
In some embodiments, a drill guide includes a hollow outer body extending from a proximal end to a distal end and having a slot disposed proximate the proximal end, wherein the distal end is configured as a reverse collet having a plurality of prongs; an inner body having a central channel extending therethrough; a spring disposed within the hollow outer body and beneath a portion of the inner body, wherein the spring biases the inner body in a direction away from the plurality of prongs; a cap coupled to the proximal end of the hollow outer body and having a through hole disposed through an upper portion of the cap in communication with the central channel, wherein the through hole is configured to allow passage of a drill bit into the central channel; a handle coupled to the hollow outer body to allow a user to grip the drill guide; and a lever coupled to the inner body through the slot, wherein the slot is shaped such that rotation of the lever results in motion along a central axis of the drill guide, and wherein a distal end of the inner body is configured to prevent radially inward deflection of the plurality of prongs when the inner body is in a lowermost position.
A more complete understanding of the present invention, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein:
Embodiments of the disclosure are generally directed to devices, systems, and methods for aligning and locking a drill guide into a polyaxial hole while maintaining the form and function of the polyaxial hole. Specifically, embodiments are directed to a drill guide configured to align a drill bit with a nominal axis/trajectory of a polyaxial screw hole. The inventive drill guide may be used with bone plates with locking and/or non-locking fasteners for dynamic compression of the bone. The hole designs may allow for polyaxial locking of the fasteners. The inventive drill guide advantageously provides for one-handed operation with quick and reliable locking capabilities. The inventive drill guide is also ergonomic and its design is streamlined.
The plates may be adapted to contact one or more of a femur, a distal tibia, a proximal tibia, a proximal humerus, a distal humerus, a clavicle, a fibula, an ulna, a radius, bones of the foot, bones of the hand, or other suitable bone or bones. The bone plate may be curved, contoured, straight, or flat. The plate may have a head portion that is contoured to match a particular bone surface, such as a metaphysis or diaphysis, flares out from the shaft portion, forms an L-shape, T-shape, Y-shape, etc., with the shaft portion, or that forms any other appropriate shape to fit the anatomy of the bone to be treated.
The embodiments of the disclosure and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments and examples that are described and/or illustrated in the accompanying drawings and detailed in the following description. The features of one embodiment may be employed with other embodiments as the skilled artisan would recognize, even if not explicitly stated herein. Descriptions of well-known components and processing techniques may be omitted so as to not unnecessarily obscure the embodiments of the disclosure. The examples used herein are intended merely to facilitate an understanding of ways in which the disclosure may be practiced and to further enable those of skill in the art to practice the embodiments of the disclosure. Accordingly, the examples and embodiments herein should not be construed as limiting the scope of the disclosure, which is defined solely by the appended claims and applicable law. Moreover, it is noted that like reference numerals represent similar features and structures throughout the several views of the drawings.
Referring now to the drawings,
As shown more clearly in
The polyaxial hole 12 cannot be threaded into via a threaded drill guide because doing so would jeopardize the locking capabilities of the polyaxial hole 12. That is, threading into the polyaxial hole 12 would damage the wind-swept cuts 14, thus negatively impacting the locking capabilities of the polyaxial hole 12. As such, the inventors have discovered an improved drill guide 200 that overcomes the need to thread into a polyaxial hole.
Referring to
As depicted in
As shown more clearly in
Referring now to
In some embodiments, the drill guide 200 may include a spring 308 to bias the inner body 302 upwardly, such that the turning of the lever 212 to lower the inner body 302 acts against a bias of the spring 308. In some embodiments, the handle 216 may include a graphic 220 to indicate in which direction movement of the lever will lock and unlock the drill guide 200 in the hole.
In some embodiments, the rigid locking provided by the drill guide 200 may advantageously also allow for the use of the drill guide 200 to introduce a device (e.g., a fixation plate) into a surgical area, as shown, for example, in
As shown in
Although the invention has been described in detail and with reference to specific embodiments, it will be apparent to one skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Thus, it is intended that the invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. It is expressly intended, for example, that all ranges broadly recited in this document include within their scope all narrower ranges which fall within the broader ranges. It is also intended that the components of the various devices disclosed above may be combined or modified in any suitable configuration.
This application is a continuation application of U.S. application Ser. No. 16/373,676 filed on Apr. 3, 2019 (published as U.S. Pat. Pub. No. 2019-0314042), which claims priority to U.S. Provisional Patent Application No. 62/655,934, filed Apr. 11, 2018, the contents of which are hereby incorporated by reference in its entirety.
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Number | Date | Country | |
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Parent | 16373676 | Apr 2019 | US |
Child | 17477591 | US |