Patient-Specific Registration Jig for Accurate Orthopaedic Alignment
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Solution Overview
Problem
Existing orthopaedic surgical instruments lack precise registration to a patient's bony anatomy, leading to challenges in accurately positioning prosthetic implants during joint arthroplasty procedures.
Innovation Solution
A patient-specific registration jig with a patient-specific contact surface and adaptor is used to securely attach orthopaedic surgical instruments, allowing precise alignment and tracking through a surgical navigation system, utilizing patient-specific negative contours and keyed features for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional orthopaedic surgical instruments are used without patient-specific registration, then the device complexity is reduced and ease of manufacture is improved, but the manufacturing precision and measurement precision of implant positioning deteriorate
Solution Approach 1:
Patient-specific registration jigs are fabricated before surgery based on pre-operative imaging data (CT or MRI scans). The jigs incorporate patient-specific anatomical surface contours that are determined and manufactured in advance, allowing precise registration during surgery without requiring complex intraoperative measurements or adjustments.
2Measurement precision
If patient-specific registration jigs with negative contours are used, then the measurement precision and alignment accuracy are improved, but the ease of manufacture and device complexity worsen
Solution Approach 1:
The registration jigs are manufactured using additive manufacturing (3D printing) technology, which allows complex patient-specific geometries including negative surface contours to be fabricated directly from digital models. This manufacturing approach transforms the difficulty of creating custom-fit components into a routine process, achieving high measurement precision without proportionally increasing manufacturing complexity.
3Measurement precision
If surgical navigation systems with tracking sensors are implemented, then the measurement precision and positioning accuracy are improved, but the device complexity and cost increase
Solution Approach 1:
Patient-specific registration jigs serve as intermediary components that physically couple surgical instruments to the patient's anatomy through precise surface contact. These jigs incorporate mounting features that attach tracking sensors, creating a reliable intermediary connection between the navigation system and the surgical site. This approach simplifies the overall navigation system by providing stable, pre-configured mounting points rather than requiring complex sensor attachment procedures during surgery.
Data Source
AI summary
A patient-specific registration jig for registering an orthopaedic surgical instrument with a bony anatomy of a patient includes a head and an adaptor coupled to the head. The head includes a patient-specific contact surface configured to contact a portion of the patient's bony anatomy such that the head can be coupled to the patient's bony anatomy in a unique position. The adaptor includes an elongated shank having a first end coupled to the head and a second end and an adaptor end attached to the second end of the elongated shank. The adaptor end is configured to be received by a clutch of the orthopaedic surgical instrument. A method for registering the orthopaedic surgical instrument using the patient-specific registration jig is also disclosed.