Cochlear Implant Flange Fixation for Bone Attachment
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Solution Overview
Problem
Conventional methods for securing cochlear implant devices in the head region are either time-consuming and risky due to drilling procedures or insufficiently strong, and may cause dislodgment or tissue damage, especially in young children with thin skulls.
Innovation Solution
A medical implant with a hermetically sealed housing featuring malleable flanges that can be securely attached to tissue surfaces, such as bone, using screws or clips, to prevent dislodgment and reduce tissue erosion, allowing for conformability during surgical implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drilling holes in bone and using sutures or Dacron ties to hold the device, then the device can be secured in place, but the procedure becomes time-consuming and risky with potential for tissue damage and device dislodgment
Solution Approach 1:
The device housing includes pre-formed flanges that extend from the housing structure, prepared in advance during manufacturing. These flanges are designed to be directly attachable to the bone surface without requiring preliminary drilling of holes or preparation of additional fixation structures during surgery.
Solution Approach 2:
The fixation function is extracted from a separate surgical procedure (drilling and suturing) and integrated directly into the device housing structure through the flanges. This eliminates the need for separate fixation steps and reduces surgical complexity.
2Reliability
If drilling holes in bone and using sutures or Dacron ties, then the device can be secured, but the strength of fixation is insufficient to withstand impact forces
Solution Approach 1:
The flanges are constructed from titanium or titanium alloy materials that combine structural strength with biocompatibility. This provides both the mechanical strength needed to withstand impact forces and the biological compatibility required for long-term implantation in the skull.
Solution Approach 2:
The flanges can be formed to have curved or contoured surfaces that conform to the natural curvature of the bone surface. This curved geometry increases the surface area of contact and distributes mechanical loads more effectively, enhancing fixation strength.
3Ease of manufacture
If using a fixed rigid housing design, then manufacturing is simplified, but the device cannot accommodate varying skull anatomy and thickness
Solution Approach 1:
The flanges are designed with dynamic characteristics that allow them to be deformed or adjusted during the surgical implantation process. This enables the same standardized housing component to adapt to different patient anatomies while maintaining manufacturing simplicity.
Solution Approach 2:
The flange geometry parameters (such as curvature radius, thickness, and extension length) can be modified during the forming process to match specific anatomical requirements. This allows a single base design to accommodate varying skull thickness and curvature across different patients.
Data Source
AI summary
A medical implant, such as an implantable component (22) of a tissue-stimulating prosthesis. One example of such a prosthesis being a cochlear implant. The component (22) is adapted to be implanted at or adjacent a tissue surface within the recipient, such as a bone surface. The component (22) has a housing and at least one flange (42) extending outwardly therefrom. The flange (42) can be secured to the tissue surface via a tissue fixation device, such as a bone screw (43).