Electrical Stimulation for Immobilized Limb Microcirculation
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Solution Overview
Problem
Current methods for improving blood flow in immobilized lower limbs, such as those in plaster casts, are inadequate in preventing deep vein thrombosis and promoting microcirculation, as they do not effectively address the increased risk of venous stasis and inflammation associated with prolonged immobility.
Innovation Solution
A device that combines electrical stimulation of the lateral popliteal nerve to induce isometric muscle contraction with immobilization of a lower limb joint, using electrodes and a power supply to enhance muscle work and blood flow, even in immobilized conditions, thereby increasing microcirculation and reducing the risk of deep vein thrombosis and inflammation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical stimulation is applied to immobilized limbs, then microcirculation is dramatically improved, but this contradicts conventional wisdom that such stimulation should not be applied to immobilized limbs
Solution Approach 1:
The patent applies electrical stimulation to immobilized limbs, which is the opposite of conventional practice. Normally, electrical stimulation is used for mobile limbs to enhance muscle pump function, but this invention inverts the approach by applying it specifically to immobilized limbs to counteract venous stasis and improve microcirculation despite the lack of voluntary movement.
2Adaptability or versatility
If isometric stimulation is used to avoid gross limb movement, then compatibility with walking is achieved, but blood flow improvement in immobilized limbs is insufficient
Solution Approach 1:
Instead of avoiding immobilization to maintain blood flow, the patent inverts the approach by applying electrical stimulation specifically during immobilization periods to achieve blood flow improvement when it is most needed, turning a previously contraindicated scenario into a therapeutic opportunity.
3Productivity
If conventional electrical stimulation methods are used without immobilization, then muscle pump function is enhanced, but they fail to address venous stasis in immobilized patients
Solution Approach 1:
The patent uses electrical stimulation as an intermediary mechanism to activate the muscle pump in immobilized limbs where voluntary contraction is not possible. The electrical stimulus serves as a mediator that bypasses the need for voluntary muscle activation while still achieving the physiological effect of enhanced venous return and reduced stasis.
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 combination of electrical stimulation and immobilization significantly increases peak venous velocity and microcirculatory velocity, reducing the risk of deep vein thrombosis and promoting wound healing by enhancing blood flow and reducing venous stasis.
Implementation Method 1
at least one electrode for administering an electrical stimulus to opposed leg muscles of a patient
Data Source
AI summary
A method and device for increasing microcirculation in the lower limb are described. The device includes a means for immobilizing the limb, for example a plaster cast, and an electrical stimulation device, which applies electrical stimulation to opposed leg muscles such that antagonistic and agonistic muscle groups contract near simultaneously, resulting in near isometric contraction. The combination of this contraction and the leg restraint have been found to markedly increase blood circulation and in particular microcirculation in the limb.