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Publication Number
US-11291548-B2
Publication Date
2022-04-05
Expiration Date
Abstract
A screw suitable for use specifically in the field of oral dental surgery consists of a bioresorbable material and comprises a drive that can be broken off by means of a predetermined breaking point and/or has a thickened shaft below the contact surface of a cap of the head of the screw.
Core Innovation
The invention relates to a bioresorbable dental screw for fixing an implant. The screw consists of a bioresorbable material, preferably magnesium or a magnesium alloy, and includes a thread for screwing into a bone. The screw further comprises a head with a cap and a drive, where the cap comprises an essentially flat contact surface for the implant.
A predetermined breaking point is provided that is designed as a constriction between a top side of the cap and the drive, and is present between the drive and the cap. The shaft thickens towards the cap, including cone-shaped geometry and a transition region with a radius. This configuration is described as preventing punching of fragile implants such as collagen membranes and magnesium foils when the implant is clamped by the essentially flat cap contact surface.
The thread is defined with a tooth geometry relationship, including teeth with a width that is at least 0.5 times a width of a tooth base. The disclosed embodiments further include a thread design with trapezoidal thread geometries having a rounded tooth base, and a self-tapping tip and/or hammer-in embodiment. A corrosion-mitigating magnesium fluoride coating is described for the magnesium-based screw.
The disclosure also describes a kit concept including the screw together with an implant, and optionally a pilot drill, a holder, a template, and an adapter/coupling for a dental drill or a manual screwdriver. Embodiments illustrated in the figures include drive geometries and an adapter that retains and releases a break-off drive.
Claims Coverage
The document provides two independent claims defining a bioresorbable implant-fixing screw with a cap/drive head, a predetermined breaking point as a constriction, a thickening shaft, and thread tooth-width constraints; one independent claim additionally specifies magnesium or magnesium alloy and more detailed thread tooth outside/base shape plus a self-tapping tip geometry.
Bioresorbable implant-fixing screw with bone thread
The screw consists of a bioresorbable material and comprises a thread for screwing it into a bone.
Head with cap and drive and essentially flat cap contact surface
The screw comprises a head with a cap and a drive, wherein the cap comprises an essentially flat contact surface for the implant.
Predetermined breaking point as a constriction between cap and drive
A predetermined breaking point that is designed as a constriction between a top side of the cap and the drive is present between the drive and the cap.
Thickening shaft towards the cap
A shaft of the screw thickens towards the cap.
Thread tooth-width relationship
Teeth of the thread comprise a width that is at least 0.5 times a width of a tooth base.
Magnesium or magnesium alloy bioresorbable material and self-tapping thread geometry
The screw consists of a bioresorbable material, namely of magnesium or of a magnesium alloy, and the thread has a self-tapping tip.
Flat or rounded thread outside with rounded merged tooth bases
The thread is designed such that teeth of the thread are flat or rounded on the outside and bases of the teeth merge rounded into flanks of the teeth.
Across the independent claims, the core claim coverage centers on a bioresorbable screw having an essentially flat cap contact surface, a cap/drive head separated by a predetermined breaking point constriction, a shaft that thickens toward the cap, and a thread with a tooth-width relationship of at least 0.5× the tooth-base width; the second independent claim further specifies magnesium or magnesium alloy material and detailed tooth outside and merged rounded base geometry with a self-tapping tip.
Stated Advantages
This configuration is described as preventing punching of fragile implants such as collagen membranes and magnesium foils when the implant is clamped by the essentially flat cap contact surface.
Documented Applications
Fixing an implant.
Screwing into a bone.
A kit including the screw together with an implant, and optionally a pilot drill, a holder, a template, and an adapter/coupling for a dental drill or a manual screwdriver.
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