Biocompatible Coating for Implantable Sensor Tissue Control
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Solution Overview
Problem
Implanted sensors face challenges due to unpredictable tissue growth, which affects their calibration and sensitivity, as the type, thickness, and evenness of tissue growth can lead to sensor drift and accuracy issues, particularly in pressure measurements.
Innovation Solution
The use of a biocompatible coating on implantable sensors, comprising biomaterial matrices, growth factors, and textured surfaces to either promote a uniform tissue growth or inhibit tissue growth, ensuring consistent sensor performance by managing tissue interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tissue growth is allowed to occur over the sensor surface, then the sensor becomes more embedded in the body and integrates better with surrounding tissue, but the sensor calibration and sensitivity are adversely affected by unpredictable tissue thickness and evenness
Solution Approach 1:
The patent applies parameter changes by modifying the tissue growth characteristics through coating composition control. The coating formulation (including ratios of growth-promoting and growth-inhibiting materials) is adjusted to achieve a target tissue thickness parameter and uniformity, thereby resolving the contradiction between integration and measurement precision.
Solution Approach 2:
The patent uses composite materials by combining multiple components in the coating: growth-promoting materials (such as collagen, fibronectin), growth-inhibiting materials (such as PTFE, PEG), and potentially texturing agents. This composite approach allows simultaneous achievement of controlled integration and predictable tissue growth for maintaining sensor calibration.
2Measurement precision
If tissue growth is inhibited to maintain sensor calibration, then measurement accuracy is improved, but sensor integration and embedding in the body is reduced
Solution Approach 1:
The patent applies local quality by creating spatial variations in the coating properties. Different regions of the coating may have different compositions or texturing characteristics - for example, areas with growth-promoting properties near the sensor interface for integration, and areas with growth-inhibiting properties at the periphery for calibration stability. This localized differentiation resolves the contradiction between integration and measurement precision.
3Stability of the object's composition
If the sensor surface is textured to promote even tissue growth, then tissue uniformity over the sensor surface is improved, but the complexity of the manufacturing process increases
Solution Approach 1:
The patent applies preliminary action by incorporating texturing features directly into the coating formulation or applying texturing treatments during the coating manufacturing process itself, rather than requiring separate post-manufacturing texturing steps. This preliminary integration of texturing into the coating application process reduces manufacturing complexity while achieving the desired tissue growth uniformity.
Data Source
AI summary
All or a portion of a surface of an implantable sensor is covered with a biocompatible coating formed at least partially of a biomaterial matrix having properties that promote a substantially even growth of tissue cells over the surface of the coating. Additional materials, such as growth factors, agents that recruit endogenous stem cells, and cell adhesion motif arginine, glycine, aspartic acid may be included in the coating. Autologous cells may be added to the coating prior to implantation. The sensor surface may also be textured, by etching or abrading, in order to promote even tissue growth. Alternatively, the sensor surface may be covered with a coating having properties that inhibit the growth of tissue. These coatings may include a biomaterial, a biomaterial matrix having a drug, such as a sirolimus or a steroid, an active component, or a self assembled monolayer.