Spring-loaded reflex device for consistent impulse delivery
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Solution Overview
Problem
Current methods for eliciting deep tendon reflexes are limited by the subjective nature of manual percussion, which can be inconsistent and difficult in scenarios with restricted access or obesity, lacking precise calibration and reproducibility.
Innovation Solution
A spring-loaded reflex testing device with a housing, activatable hammer, impulse generator, and adjustable force mechanism, allowing for consistent and controlled impulse delivery to elicit deep tendon reflexes, even in spatially constrained areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a manual reflex hammer is used to elicit deep tendon reflexes, then the device is simple and easy to operate, but the measurement precision and reproducibility are poor due to subjective variability
Solution Approach 1:
The patent replaces the manual mechanical reflex hammer with an automated mechanical system that uses a spring-loaded hammer mechanism. This substitution eliminates the subjective variability of manual operation while maintaining mechanical simplicity. The automated system delivers consistent, calibrated impulses to the tendon, improving measurement precision without requiring complex electronics or control systems.
2Reliability
If a traditional reflex hammer is used, then the device structure is simple, but it cannot deliver consistent and calibrated impulses
Solution Approach 1:
The patent implements a spring-loaded mechanism with adjustable tension to control the impulse parameters. By changing the spring tension and hammer mass parameters, the device can deliver consistent and calibrated impulses with known force magnitudes. This parameter control ensures reliability and reproducibility of the reflex elicitation while maintaining a relatively simple mechanical structure.
3Adaptability or versatility
If a manual hammer swing is used to test reflexes, then the method is simple, but it is obstructed in cases of contractures or severe obesity
Solution Approach 1:
The patent introduces a device body that acts as an intermediary between the operator and the tendon. The device can be positioned directly over the tendon site, and the spring-loaded hammer delivers the impulse through this intermediary structure. This approach bypasses the need for a wide swing arc, allowing the device to function effectively in patients with contractures or obesity where manual hammer access is limited.
4Measurement precision
If subjective grading by examiner is used, then no additional equipment is needed, but the assessment lacks objectivity and calibration
Solution Approach 1:
The patent replaces the subjective human assessment system with an objective mechanical delivery system. The device provides calibrated impulses with known force parameters, transforming the reflex assessment from a subjective sensory task to an objective mechanical stimulus-response measurement. This substitution improves measurement precision while maintaining relatively simple device construction.
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 provides a consistent and measurable impulse to objectively assess deep tendon reflexes, improving reproducibility and accuracy in hypo-, normo-, and hyper-reflexive states, particularly in conditions where manual percussion is obstructed.
Implementation Method 1
a spring-loaded device for eliciting deep tendon reflexes
Data Source
AI summary
A deep tendon reflex-eliciting device actuated by pressure against a patient's skin, which releases a spring-loaded mass that delivers an impulse through a fully-enclosed housing. This device includes a weight contained within the casings, and a mainspring in communication with the weight. The mainspring has a bias toward expansion. In the compressed position, the mainspring is also compressed, and the weight is pushed backwards into the rear casing. The weight is released to be driven forward by the mainspring. The weight strikes the inside of the forward casing, delivering an impulse to a surface against which the device is pressed. A reset spring can push apart the forward and rear casings to reset the device to its expanded position. A case screw is also included which is able to consistently set the impact force of the device.