System for attaching a piece of osteosynthesis equipment
Inventors
Leonard, Alain • LEONARD, Carole • Sender, Cyril • HALBIN, Gautier • LIGNON, Olivier • SAHRAOUI, Nouredine
Assignees
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Publication Number
US-9974591-B2
Publication Date
2018-05-22
Expiration Date
Abstract
A system for attaching a piece of osteosynthesis equipment against a bone tissue includes at least a screw, and a screwdriver having a handle extended by a rod with an adapter to engage the screw. A portion of the guide member of the screwdriver protrudes in front of the end-piece of the screwdriver and extends along or around a portion of the screw to guide the screw in axial translation. The guide member has a front end forming an abutment of the screwdriver against the surface of the piece of osteosynthesis equipment on completion of a predefined depth of screwing of the screw into the bone tissue. The guide member can be set at a chosen length of extension, corresponding to a predefined depth of insertion of the screw. After insertion, the screw can be severed, and optionally fused with the piece of equipment to reinforce the locking of same.
Core Innovation
The invention relates to an osteosynthesis fixation system for fixation of an osteosynthesis instrument against a bone tissue. The system includes at least a screw having a threaded shaft and a rear end, and a screwdriver having a handle extended by a rod carrying an adapter configured to cooperate with the rear end of the screw. The screw consists of a material comprising a polymer, optionally resorbable, and the system includes a guide member connected to the rod to guide the screw.
The guide member has one portion projecting in front of the adapter and extending along or around part of the screw, so the screw is inserted freely in translation into the guide member while the guide member guides the screw in axial translation. The guide member is mounted to slide on the rod and comprises a locking mechanism that locks the guide member in at least one position corresponding to a predefined screwing depth of the screw. A front end of the guide member forms a stop of the screwdriver against the surface of the osteosynthesis instrument when the predefined screwing depth in the bone tissue is reached.
When the predefined screwing depth is reached, the front end stop causes the screwdriver to be blocked and the screw to advance to the stop by separation of the rear end of the screw from the adapter. After insertion, a protruding rear portion of the polymer/composite screw is cut flush and may be fused to reinforce locking, and embodiments further include a tube-shaped guide member with an orifice and an adjustable sliding member on the rod with a graduated scale and a slot for viewing and setting the screwing depth.
Claims Coverage
The document provides one independent claim. It describes a polymer screw fixation system with a guide-member-based depth control mechanism, including a predefined screwing depth stop that blocks the screwdriver and allows the screw to advance to the stop by separation from the adapter. The independent claim contains the core inventive concept; dependent claims refine the screw/adapter interface, the guide member structure, the locking mechanism, visualization features, and optional screw and polymer material characteristics.
Polymer screw with screwdriver adapter and axial guide-member translation
A system for fixation of an osteosynthesis instrument against a bone tissue, comprising at least a screw having a threaded shaft and a rear end and a screwdriver having a handle extended by a rod carrying an adapter configured to cooperate with the rear end of the screw, wherein the screw consists of a material comprising a polymer, and wherein the screwdriver comprises a guide member connected to the rod to guide the screw with a portion projecting in front of the adapter to extend along or around part of the screw and guide the screw in axial translation.
Sliding guide-member locking to predefined screwing depth with a stop
The guide member is mounted to slide on the rod and comprises a locking mechanism to lock the guide member in at least one position corresponding to a predefined screwing depth of the screw, the guide member comprising a front end forming a stop of the screwdriver against the surface of the osteosynthesis instrument when the predefined screwing depth of the screw in the bone tissue is reached.
Decoupling by rear-end separation from adapter while screw advances to stop
When the predefined screwing depth is reached, the screwdriver is blocked and the screw advances to the stop by a separation of the rear end of the screw from the adapter.
Overall claim coverage centers on using a polymer screw with a screwdriver adapter and a projecting guide member that guides axial translation, then uses a sliding, lockable guide member to set and enforce a predefined screwing depth via a stop against the osteosynthesis instrument surface. The mechanism results in blocking the screwdriver and advancing the screw to the stop by separating the screw’s rear end from the adapter.
Stated Advantages
Provides fixation of an osteosynthesis instrument against bone tissue.
Allows controlled insertion to a predefined screwing depth through a guide-member stop that blocks the screwdriver and advances the screw to the stop.
Supports use of polymer (optionally resorbable) screw material.
Optionally reinforces locking by fusion of a cut flush protruding rear portion.
Enables adjustment and setting of screwing depth using a graduated scale and a slot for viewing.
Documented Applications
Fixation of an osteosynthesis instrument against a bone tissue using a screw and screwdriver system with axial translation guidance and depth control.
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