Implantable Pump Sensors for Consistent Drug Flow
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Solution Overview
Problem
Conventional implantable drug-delivery devices lack the ability to dynamically respond to changes within the device or at the drug-delivery target, such as tissue growth or temperature fluctuations, leading to inconsistent drug flow and dosage delivery.
Innovation Solution
Incorporating flow sensors and pressure sensors within the implantable pump and cannula to monitor and adjust the drug delivery in real-time, using circuitry to ensure consistent flow rates and dosages, and including features like filters and check valves to prevent blockages and backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional implantable drug-delivery devices are used without feedback control, then the device structure remains simple, but the device cannot dynamically respond to changes inside the device or at the drug-delivery target, leading to inconsistent drug flow and dosage delivery
Solution Approach 1:
The patent implements feedback control by incorporating sensors (flow sensors, pressure sensors, temperature sensors) that continuously monitor conditions within the device and at the delivery target. The control circuitry receives signals from these sensors and automatically adjusts pump operation to maintain desired flow rates and dosages despite changes in tissue growth, temperature fluctuations, or other environmental factors.
Solution Approach 2:
The patent replaces simple mechanical passive drug delivery mechanisms with an electronically controlled pump system. The pump uses electrical signals from the control circuitry to regulate drug flow, replacing purely mechanical or passive diffusion-based delivery systems with an active electronically controlled mechanism that can respond dynamically to sensor feedback.
2Duration of action of stationary object
If tissue growth occurs at the outlet of the implanted device, then the device remains implantable without repeated surgery, but tissue growth creates fluidic restriction that prevents desired flow rate and dose delivery
Solution Approach 1:
The flow sensor continuously monitors the actual drug flow rate through the cannula. When tissue growth at the outlet creates restriction and reduces flow below the desired rate, the sensor detects this change and signals the control circuitry, which then increases pump operation to compensate for the restriction and maintain the required flow rate and dosage delivery.
Solution Approach 2:
The pump system dynamically adjusts its operation in response to changing conditions. As tissue growth progressively restricts flow over time, the control circuitry continuously modifies pump output based on real-time feedback from flow and pressure sensors, allowing the system to adapt to gradually worsening restrictions while maintaining effective drug delivery throughout the extended implantation period.
3Adaptability or versatility
If passive or active drug-delivery devices without feedback control are used, then the device operation is simple, but the desired flow rate or dose cannot be delivered in the presence of temperature fluctuations, manufacturing variations, or different drug formulations
Solution Approach 1:
Temperature sensors, flow sensors, and pressure sensors continuously monitor conditions within the device. The control circuitry receives feedback about temperature fluctuations, manufacturing variations, and drug formulation differences, then automatically adjusts pump operation to compensate for these variations and maintain consistent flow rates and dosages across different operating conditions.
Solution Approach 2:
The control circuitry adjusts pump operating parameters (such as pump speed, pressure, or flow rate) based on feedback from sensors that detect temperature changes, manufacturing variations, or drug formulation differences. This dynamic parameter adjustment allows the system to adapt to different conditions while maintaining consistent therapeutic delivery.
Data Source
AI summary
In various embodiments, an implantable pump includes a cannula. The pump (e.g., the cannula thereof) may include, for example, flow sensors, pressure sensors, filters, and/or other components.