Scribing Tools for Precise Cartilage Defect Preparation
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Solution Overview
Problem
Current methods for repairing cartilage defects, such as those in the knee, face challenges in accurately preparing the defect site and sizing implants during surgical procedures, leading to prolonged surgeries and potential need for multiple procedures due to the difficulty in clearing damaged tissue and matching the implant size to the defect site, especially in minimally invasive arthroscopic procedures.
Innovation Solution
The development of surgical devices and methods that include scribing tools to mark and remove tissue in predetermined shapes, allowing for precise cavity creation and subsequent implant sizing, using tools like compass-style and wood cutter-style scribing tools, and template tools to ensure accurate cutting of biocompatible tissue repair scaffolds that match the defect site dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional cartilage repair methods are used, then cartilage defects can be treated, but surgical time is prolonged and multiple procedures may be needed due to difficulty in accurately preparing defect sites and sizing implants
Solution Approach 1:
The patent applies preliminary action by providing pre-sized and pre-shaped cartilage implants that are prepared before surgery. The implants are manufactured in advance with precise dimensions matching common defect site sizes, eliminating the need for intraoperative sizing and shaping. This preliminary preparation significantly reduces surgical time while maintaining high precision in defect site matching.
Solution Approach 2:
The patent uses copying by creating implants that replicate the exact dimensions and shape of the defect site. Pre-operative imaging and measurement techniques are used to create a copy of the defect geometry, which then guides the manufacturing of custom-fit implants. This ensures precise matching without requiring extensive intraoperative adjustment.
2Manufacturing precision
If traditional cartilage repair methods are used, then cartilage defects can be treated, but multiple procedures may be needed due to difficulty in matching implant size to defect site
Solution Approach 1:
The patent applies parameter changes by offering implants in a range of pre-determined sizes, shapes, and geometries. During surgery, the surgeon can select the implant whose parameters (dimensions, curvature, thickness) best match the measured defect site parameters. This standardized parameter system enables precise matching in a single procedure without requiring custom manufacturing during surgery.
Solution Approach 2:
The implant is prepared in advance with precise manufacturing tolerances and exact dimensions. Pre-operative planning allows the implant to be manufactured to match the defect site specifications before surgery, ensuring that the implant arrives at the operating room ready for immediate implantation without requiring additional sizing or shaping procedures.
3Ease of operation
If minimally invasive arthroscopic procedures are used, then patient recovery is improved, but accurate preparation of defect site and sizing of implants becomes more difficult
Solution Approach 1:
The patent introduces intermediary tools such as arthroscopic measurement devices, imaging systems, and template tools that can be inserted through small incisions. These intermediaries enable precise measurement and marking of defect sites without requiring open surgery. The tools transmit measurement data from the difficult-to-reach defect site to the surgeon, maintaining measurement precision while preserving the minimally invasive approach.
Solution Approach 2:
The patent uses copying techniques by creating visual or digital replicas of the defect site geometry through arthroscopic imaging. The imaging system captures the three-dimensional shape and dimensions of the defect, which is then used to select or customize the implant dimensions. This allows accurate measurement and implant sizing through minimally invasive means without direct visual inspection.
Data Source
AI summary
Methods and devices are provided for preparing and implanting tissue scaffolds. Various embodiments of scribing tools are provided that are configured to mark one or more predetermined shapes around a defect site in tissue. The shape or shapes marked in tissue can be used to cut a tissue scaffold having a shape that matches the shape or shapes marked in tissue. In one embodiment, the scribing tool used to mark a shape in tissue can also be used to cut the tissue scaffold.