Bone Depth Stop Instrument with Pivoting Ring
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Solution Overview
Problem
In orthopedic procedures, surgeons face challenges in accurately forming and sizing the intramedullary canal of bones for artificial joint implants without removing too much spongy bone, which can result in oversized channels if overly aggressive rasping occurs.
Innovation Solution
A depth stop instrument with a cross-pin and pivoting ring is used, which can be inserted into the intramedullary canal to prevent over-insertion and provide a depth stop, allowing for precise approximation of the bone's surface angle and preventing excessive bone removal, thereby ensuring a proper fit for the implant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If surgeons use reamers and rasps to form and size the intramedullary canal, then the canal can be prepared to accept the implant, but excessive bone removal may occur resulting in an oversized channel
Solution Approach 1:
The depth stop ring is pre-configured with a specific depth measurement that corresponds to the desired canal size. Before the rasping operation, the ring is attached to the cross-pin at the appropriate depth position, establishing a predetermined stopping point that prevents excessive bone removal during the procedure.
Solution Approach 2:
The depth stop ring serves as an intermediary mechanism between the surgeon's rasping action and the bone tissue. It provides a physical barrier that mediates the depth of insertion, allowing the surgeon to apply force without directly contacting the bone at the critical depth position, thereby preventing over-rasping.
2Manufacturing precision
If surgeons rasping the spongy bone to form the canal, then the canal can be sized appropriately, but the compact bone may be removed resulting in an oversized channel
Solution Approach 1:
The depth stop ring is pre-configured with a specific depth measurement that corresponds to the desired canal size. Before the rasping operation, the ring is attached to the cross-pin at the appropriate depth position, establishing a predetermined stopping point that prevents excessive bone removal during the procedure.
Solution Approach 2:
The depth stop ring serves as an intermediary mechanism between the surgeon's rasping action and the bone tissue. It provides a physical barrier that mediates the depth of insertion, allowing the surgeon to apply force without directly contacting the bone at the critical depth position, thereby preventing over-rasping.
3Ease of operation
If no depth stop mechanism is used, then the surgical procedure is simpler, but the accuracy of canal formation is compromised
Solution Approach 1:
The depth stop ring is designed to be self-indicating, with visual markers that show the surgeon the current depth position without requiring additional measurement tools or complex calibration procedures. The ring serves its own function of depth indication, eliminating the need for separate measurement devices.
Solution Approach 2:
The depth stop ring combines multiple functions into a single component: it provides both the depth stopping function and the depth indication function. This multi-functional design simplifies the overall surgical system by eliminating the need for separate depth measurement tools while maintaining ease of operation.
Data Source
AI summary
An instrument can comprise an instrument body, a cross-pin, and a ring. The instrument body can be configured to be partially inserted into an intramedullary canal of a bone having a bone resection. The cross-pin can extend through the instrument body, and the ring can be movably coupled to the cross-pin and positionable on the bone resection. The ring can be configured to pivot about a longitudinal axis of the cross-pin such that an angle of the ring relative to the instrument body approximates a surface angle of the bone resection relative to the instrument body. Additional apparatus, methods, and systems are disclosed.