Mechanical Insulin Pump Drive System for Precision Delivery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing insulin pumps face challenges in delivering insulin with high precision and reliability, particularly due to electronic component failures and susceptibility to occlusions in fluid paths, which can lead to inaccurate or incomplete insulin delivery.
Innovation Solution
A drive system comprising a motor, gear box, and mechanical displacement unit that converts rotational motion into continuous linear motion for basal insulin delivery, with a mechanical displacement unit for independent bolus delivery, and a mechanical occlusion detection system to prevent blockages, all without electronic control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronically or electromechanically driven pumps are used for insulin delivery, then delivery precision and control capability are improved, but reliability deteriorates due to electronic component failures
Solution Approach 1:
The patent replaces electronic control systems with a purely mechanical drive system. The motor-driven pump is substituted by a mechanical winding mechanism that uses a spring-loaded drive member engaged with a ratchet mechanism on the piston rod. This mechanical substitution eliminates electronic components while maintaining delivery precision through mechanical engagement and counting mechanisms.
Solution Approach 2:
The mechanical drive system is self-contained and self-regulating. The ratchet mechanism automatically prevents backward motion, the spring-loaded drive member provides consistent force, and the mechanical counter tracks delivered volume without electronic sensors or processors. The system serves itself through inherent mechanical properties rather than external electronic control.
2Adaptability or versatility
If multiple fluid paths are used for basal and bolus insulin delivery, then delivery versatility is improved, but susceptibility to occlusions increases
Solution Approach 1:
The patent segments the delivery function temporally rather than spatially. Instead of separate fluid paths for basal and bolus, a single piston performs sequential deliveries: first basal insulin during the winding process, then bolus insulin after additional winding. This segmentation in time eliminates multiple fluid paths while maintaining delivery versatility through controlled operational phases.
Solution Approach 2:
The single piston and needle assembly serves multiple functions: it delivers both basal and bolus insulin through the same fluid path. The versatility is achieved by controlling the winding amount to differentiate between basal (smaller winding) and bolus (larger winding) deliveries, making one component perform multiple delivery roles.
3Ease of operation
If the insulin pump is made small and compact for wearable use, then ease of operation is improved, but device complexity increases to achieve precise mechanical drive
Solution Approach 1:
The patent merges the drive mechanism and volume delivery function into a single integrated mechanical system. The winding action simultaneously drives the piston forward and advances the ratchet mechanism, combining motor function, pump function, and metering function in one compact assembly. This merging reduces overall device complexity while achieving precise mechanical drive in a portable form factor.
Solution Approach 2:
The mechanical components are nested within each other to minimize space. The spring-loaded drive member is contained within the housing, the ratchet mechanism is integrated on the piston rod, and the volume counter is embedded in the assembly. This nesting arrangement achieves compact dimensions suitable for wearable use while maintaining the precision of the mechanical drive system.
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
This solution provides a reliable and precise insulin delivery system that is compact, safe, and economically producible, capable of delivering both basal and bolus insulin doses while detecting occlusions, thus enhancing user safety and reducing production costs.
Implementation Method 1
a gear box for converting a rotation of the motor into a continuous linear motion of a piston
Implementation Method 2
a mechanical displacement unit configured for superposing the continuous linear motion of the piston by a mechanical displacement of the piston
Data Source
AI summary
An inventive drive system for an insulin pump includes a motor configured to rotate at a predetermined revolution speed. It also includes a gear box configured for acting on a piston of the insulin pump to thereby convert a rotation of the motor into a continuous linear motion of the piston via a threaded rod mechanically coupled to the piston. The continuous linear motion of the piston determines a basal rate of insulin delivery. Additionally, a mechanical displacer is provided to act on the piston by adding a mechanical displacement of the threaded rod to the continuous linear motion of the piston, such as during a time then a bolus of insulin is to be delivered in addition to the basal rate. The threaded rod is mechanically coupled to the piston independent of the basal rate. An insulin pump and a method for driving an insulin pump are also disclosed.