FIELD OF THE DISCLOSURE

This disclosure is in the field of medical treatment devices and methods. In particular, the disclosure relates to devices and methods for use in medical procedures including devices incorporating cutting tips for creating or enlarging holes in bone.

BACKGROUND

Orthopedic surgical procedures can require the creation or enlargement of holes in bones. In vertebral surgery, for example, precise alignment of holes is desirable, and in some instances, alignment of holes is necessary for proper placement of medical devices, such as matched medical plates.

Thus, there is a need for medical devices that allow for precise alignment of holes in bone, including alignment of holes for use with other medical devices. The disclosure is directed to these and other important needs.

DISCLOSURE

The present disclosure provides aspects of trocar insertion with a hollow body having a proximal end and distal end with a toroid at the proximal end forming an extended curved annular wall surface; wherein the distal end is fixedly attached to a spring housing cap with a fluid connection therein; a trocar compression spring and spring retention feature are enclosed within the interior volume of the spring housing, the trocar compression spring is configured to be compressed between the spring retention feature and a spring catching feature located at the proximal end of the spring housing; at least a portion of an elongated blade fixture is slidably disposed within the spring housing with the central longitudinal axes of the elongated blade fixture and the spring housing being coaxially aligned; the elongated blade fixture protruding from the spring housing; and, wherein the toroid is configured to mate with a first guide on a matched medical plate whereby a second guide defines a maximum cone of operation or limit for the elongated blade.

In some instances, the spring housing is connected to a driver handle via a driving shaft affixed thereto. The attachment of spring housing to driving shaft may include a first mating feature on an open proximal end of the driving shaft opposite the driver handle; and, wherein the hollow body fits movably into the open proximal end. The system may include the elongated blade fixture having a proximal and a distal ends with a mating feature on its distal end; and, the spring retention feature is located on the elongated blade fixture between its proximal and distal ends.

In some instances, the spring housing has a collar feature located on the elongated blade fixture between the spring retention feature and the distal end; and, a spring housing cap slidably fitted around the elongated blade fixture between the spring retention feature and the collar feature. In some instances, the trocar compression spring is fitted around the elongated blade fixture between proximal end and the spring retention feature.

The present disclosure provides aspects of methods of trocar insertion or forming a pilot hole in a surface, tissue, bone, cadaver, or material the method includes positioning a matched medical plate which has a first side and a second side and one or more apertures each aperture having a first guide and a second guides, the second guide being angled at a predetermined angle theta “θ” on a surface; inserting a trocar insertion system through the first side of the matched medical plate through a first guide of one of the apertures; the trocar system having a spring housing defining a hollow body with a proximal end and a distal end; the distal end of the spring housing is fixedly attached to the spring housing cap, the trocar compression spring and spring retention feature enclosed within the interior volume of the spring housing, the trocar compression spring is configured to be compressed between the spring retention feature and a spring catching feature located at the proximal end of the spring housing, at least a portion of the elongated blade fixture is slidably disposed within the spring housing with the central longitudinal axis of the elongated blade fixture and the spring housing being coaxially aligned; engaging the proximal end of the spring housing with the first guide; and, applying a force to the elongated blade fixture relative to the matched medical plate to move the proximal end of the elongated blade fixture through the aperture and through the second side of the matched medical plate into a surface.

In some instances the method includes the elongated blade fixture is affixed to a driving shaft whereby the force applied to the elongated blade fixture is transferred from the driving shaft thereto and the driving shaft may be affixed to a handle whereby the handle transfers force to the driving shaft.

The present disclosure provides aspects of trocar insertion and pilot hole forming system of positioning a matched medical plate having a first side and a second side on a surface; providing one or more apertures through said matched medical plate and each guide having a first toroidal interface on the first side one side and a second guide of the toroidal interface on the second side; aligning a trocar insertion system having a drive handle, a driving shaft and an elongated blade affixed within a spring housing and extendable therefrom providing a toroid at the distal end of the spring housing configured to mate with said apertures; engaging the toroidal interface with the toroid at the first guide of the toroidal interface of the aperture; adjusting a cone of operation of the trocar insertion system via movement of the trocar insertion system at the toroidal interface within a cone of operation; applying force to the driver handle relative to the matched medical plate to extend the proximal end of the elongated blade fixture and at least a portion of the shaft through the toroidal interface and aperture; forming the pilot hole with the proximal end of the elongated blade fixture within the limits of the control cone of operation.

In some instances the cone of operation is one of less than about 10 degrees, less than about 20 degrees or about 30 degrees or less. In some instances, an angle “α” is selected for the positioning of the proximal end; and wherein a hole formed at the angle “α”. In some instance the hole formed at the angle, “a” is in one of an inanimate object, cadaver or live tissue and bone.

The general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure, as defined in the appended claims. Other aspects of the present disclosure will be apparent to those skilled in the art in view of the detailed description of the disclosure as provided herein.

