Acetabular Reaming Guide Depth Control via Abutment Element
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Solution Overview
Problem
Existing acetabular reaming guides and reamers are bulky, making them an obstacle for surgeons during total hip arthroplasty procedures, and they are difficult to maintain in the desired position due to vibrations, which can lead to incorrect milling depth and potential damage to soft tissues.
Innovation Solution
A customized patient-specific acetabular reaming guide with a compact design featuring a circular body, support elements for anatomical fixation, and a ring-like abutment element to limit milling depth, allowing for precise bone milling without hindering the surgeon's view or access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If known reaming guides are used to maintain reamer position and control milling depth, then milling precision is improved, but the device becomes bulky and obstructs surgeon's view and access
Solution Approach 1:
The reaming guide is divided into separate functional components: a guide body with positioning elements and a depth control mechanism with an abutment element and stop. This segmentation allows each component to be optimized independently, reducing overall bulk while maintaining precision functions.
Solution Approach 2:
The depth control mechanism transitions from a longitudinal stop (one-dimensional) to a radial abutment element against a stop surface (two-dimensional contact). This dimensional change provides effective depth control with a more compact structure that does not extend far from the reamer axis.
2Manufacturing precision
If reaming guide components are added to control milling depth, then milling precision is improved, but device complexity increases
Solution Approach 1:
The depth control function is merged with the guide body structure. The abutment element is integrated into the guide assembly, and the stop surface is formed as part of the guide structure, eliminating the need for separate depth control devices and reducing overall complexity.
Solution Approach 2:
The guide body serves multiple functions: positioning the reamer, controlling milling depth, and providing structural support. The abutment element simultaneously provides depth limiting and structural stability. This multi-functionality reduces the number of separate components needed.
3Stability of the object's composition
If bulky reaming guides are used to ensure stability, then positioning stability is improved, but ease of operation deteriorates due to obstructed view and access
Solution Approach 1:
The guide employs thin-walled but structurally optimized geometry that provides sufficient stiffness for positioning stability while minimizing overall volume. The slender profile reduces obstruction of surgeon's view and access to the surgical site.
Solution Approach 2:
The guide incorporates curved and rounded geometries that provide structural strength with minimal material, reducing bulk while maintaining stability. The streamlined shape reduces interference with surgical access compared to boxy or angular designs.
Data Source
AI summary
An orthopedic surgical instrument comprising: a customized patient-specific acetabular reaming guide comprising an at least partially circular body, having an inner surface defining a slot sized to receive an acetabular reamer head, and further having a top surface defining a contact element; at least one support element configured for supporting the at least partially circular body on a patient-specific anatomy of a coxal bone; and further comprising at least one acetabular reamer head comprising a bone milling portion configured for insertion in the slot of the acetabular reaming guide; a connecting element configured for removable attachment to a reamer's shank for operation of the at least one acetabular reamer head; wherein the orthopedic surgical instrument further comprises an abutment element attached to a top portion at least one acetabular reamer head and configured to limit a milling depth of the bone milling portion, by resting on the contact element of the acetabular reaming guide.