Optogenetic Pelvic Floor Control via Light-Responsive Opsins
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Solution Overview
Problem
Current treatments for neurogenic disorders of the pelvic floor, such as bladder dysfunction, fecal incontinence, and sexual dysfunction, lack specificity and efficacy in precisely targeting neural cells and muscles, leading to inadequate control over urinary, rectal, and sexual functions.
Innovation Solution
The use of stably expressed light-responsive opsin proteins that selectively alter the membrane potential of neurons innervating muscles and organs responsible for these functions, allowing for hyperpolarization or depolarization-induced synaptic depletion to control muscle activity through light activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical neurostimulation is used to treat bladder dysfunction, then muscle contraction can be stimulated, but the electrode is non-selective and will stimulate every tissue and cell type within its electrical field, resulting in lack of cell-type specificity
Solution Approach 1:
The patent replaces the mechanical/electrical stimulation system (electrodes delivering electrical pulses) with an optical system (light-responsive opsins activated by specific wavelengths of light). This substitution enables cell-type specificity because different opsin variants can be targeted to specific neuronal populations through genetic targeting mechanisms, allowing selective activation of detrusor-innervating neurons without stimulating surrounding tissues.
Solution Approach 2:
The patent introduces light-responsive opsin proteins as intermediary molecules that convert optical signals into neuronal activation. These opsins act as selective mediators between the external light stimulus and the target neurons, enabling precise control of specific cell types through genetic targeting while avoiding non-specific activation of other tissues that occurs with electrical electrodes.
2Reliability
If sacral root rhizotomy is performed to prevent detrusor hyperreflexia, then bladder function can be controlled, but sexual function is lost and afferent pathways are damaged leading to bladder areflexia
Solution Approach 1:
The patent applies local quality by using genetically targeted opsin expression to activate only specific neuronal populations that innervate the detrusor muscle. This localized activation spares other neural pathways that control sexual function and afferent signaling, avoiding the widespread damage caused by sacral root rhizotomy while maintaining effective bladder control.
Solution Approach 2:
The patent segments the neural control system by selectively targeting and activating only the efferent pathways to the detrusor muscle using cell-type-specific opsin expression. This segmentation allows independent control of bladder contraction without affecting other sacral nerve functions, thereby preserving sexual function and afferent pathways while preventing detrusor hyperreflexia.
3Reliability
If external urinary sphincter is activated first during electrical stimulation, then sphincter closure is achieved, but detrusor muscle cannot contract effectively due to simultaneous activation
Solution Approach 1:
The patent employs periodic action by using sequential or alternating light stimulation patterns to first activate the external urinary sphincter for closure, then activate the detrusor muscle for contraction. This temporal separation of activation phases enables coordinated sphincter-bladder function, allowing complete bladder emptying without the conflicting simultaneous activation that occurs with electrical stimulation.
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 approach enables precise control over bladder storage and voiding, fecal continence, and sexual function, potentially alleviating symptoms like urinary retention, incontinence, and sexual dysfunction, while minimizing side effects and complications associated with existing methods.
Implementation Method 1
Optogenetics refers to the combination of genetic and optical methods used to control specific events in targeted cells of living tissue. The hallmark of optogenetics is the introduction of fast light-responsive ion channel and/or pump proteins to the plasma membranes of target neuronal cells that allow temporally precise manipulation of neuronal membrane potential
Data Source
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AI summary
Provided herein are methods for the treatment of bladder dysfunction, including detrusor hyperreflexia and detrusor external sphincter dyssynergia, fecal incontinence, and/or sexual dysfunction in an individual via the use of stably expressed light-responsive opsin proteins capable of selective hyperpolarization or depolarization of the neural cells that innervate the muscles responsible for physiologic functioning of urinary bladder, external urinary sphincter, external anal sphincter, and the male and female genitalia.