MEMS-Actuated Implant Membrane for Substance Transfer Control
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Solution Overview
Problem
Existing implant devices face challenges in efficiently controlling the transfer of substances with the body, leading to inflammation and fibrosis due to passive diffusion and foreign material reactions, necessitating a trade-off between coupling with surrounding tissue and long-term hosting.
Innovation Solution
An implant device with a biointerface featuring a cavity, actuatable membrane, power-generating unit, and electromechanical system (MEMS or NEMS) to actively control substance transfer through a flow path, using actuators to deform the membrane and regulate substance exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If passive diffusion is used for substance transfer, then the device structure is simple, but substance delivery efficiency is insufficient
Solution Approach 1:
The patent replaces passive diffusion with an electromechanical system (MEMS/NEMS) that uses electrical signals to actuate a membrane, enabling active control of substance transfer. The membrane can be deformed electrostatically to open or close pores, transforming the passive diffusion process into an actively controlled mechanism driven by electrical energy.
Solution Approach 2:
The patent introduces a dynamically controllable membrane that can change its state between open and closed configurations based on electrical actuation signals. This dynamic capability allows the device to adjust substance transfer rates in real-time, improving delivery efficiency while maintaining the ability to control when and how substances are released.
2Reliability
If fibrotic passivation is allowed to occur, then long-term hosting is enabled, but coupling with surrounding tissue is reduced
Solution Approach 1:
The patent employs periodic mechanical stimulation through membrane actuation to prevent excessive fibrotic encapsulation. By periodically deforming the membrane and stimulating surrounding tissues, the device maintains blood circulation and prevents the formation of thick fibrotic barriers, thereby preserving tissue coupling over the long term while still enabling stable hosting.
Solution Approach 2:
The electromechanical system can generate mechanical vibrations or oscillations in the membrane that propagate to surrounding tissues. This mechanical stimulation promotes blood flow and prevents stagnation, reducing fibrotic response and maintaining healthy tissue-device interface while ensuring long-term device stability.
3Productivity
If membrane actuation is added to control substance transfer, then substance delivery efficiency is improved, but device complexity increases
Solution Approach 1:
The patent uses a thin, flexible membrane as the control element for substance transfer. This membrane can be easily actuated by the electromechanical system and integrated into the device structure with minimal additional complexity. The membrane's flexibility allows it to respond to small actuation forces while maintaining structural integrity.
Solution Approach 2:
The membrane incorporates porous structures that allow substance passage when open. The pores can be controlled to open or close based on membrane deformation, providing a simple yet effective mechanism for regulating substance transfer without requiring complex valve or pump systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device enables deterministic control of substance transfer, preventing fibrosis and improving substance delivery efficiency, allowing for active management of exchanges between the implant and its environment.
Implementation Method 1
an electromechanical system (for example, a microelectromechanical or a nanoelectromechanical system) is connected to both the control unit and the power-generating unit. The electromechanical system includes at least one actuator configured to mechanically contact the membrane
Implementation Method 2
a trade-off must be found between efficiently coupling the implant device via fibrotic responses to surrounding tissue (and then blood circulation) and an acceptable fibrotic passivation enabling long-term hosting of the implant. Furthermore, the delivery of compounds into the tissue can be an issue if it is only based on diffusion
Data Source
AI summary
An implant device having a biointerface. The implant device comprises a cavity and a structure enabling a flow path between the cavity and an environment of the implant device. An actuatable membrane is interposed in the flow path. The device includes a power-generating unit and a control unit, where the latter is connected to the power-generating unit. An electromechanical is connected to both the control unit and the power-generating unit. The electromechanical system includes at least one actuator configured to mechanically contact the membrane. This actuator is permanently attached to the membrane. The control unit and the electromechanical system are jointly configured to cause the electromechanical system to controllably actuate the membrane via at least one actuator to control a transfer of substances between the cavity and the environment through the flow path. The invention is further directed to related operation and fabrication methods.