Linear-Actuated Joint Range-of-Motion Linkage for Flexible Setup

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Solution Overview

Problem

Existing devices for exercising or moving joints such as elbows, knees, ankles, or wrists lack flexibility and adaptability in imposing various conditions, including stretching and movement across a selected range of motion, and often require complex setups.

Innovation Solution

A range-of-motion device with a first and second link member, an intermediate linkage, and a flexion-extension actuator, allowing for adjustable support and movement configurations to accommodate different joints and user orientations, utilizing a linear actuator for controlled joint manipulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If existing devices for exercising joints are used, then joint movement is achieved, but the devices lack flexibility and adaptability in imposing various conditions such as stretching and movement across selected range of motion

Engineering Contradiction:

Improveflexibility and adaptability in imposing various conditionsVSAvoidcomplex setups

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The device employs adjustable linkages and configurable actuators that can be dynamically repositioned and reconfigured to accommodate different joint types and movement conditions. The linkage system allows dynamic adjustment of arm lengths, attachment points, and movement ranges, enabling the same device to adapt to various therapeutic requirements without requiring complex fixed configurations for each scenario.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The device is designed as a universal joint exercise system that can handle multiple joint types (elbow, knee, ankle, wrist) and various movement conditions (stretching, range of motion exercises) through a single configurable platform. The standardized interface and adjustable parameters allow one device to perform multiple functions that would traditionally require separate specialized equipment.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If complex setups are used to achieve various stretching and movement conditions, then adaptability is improved, but the ease of operation deteriorates

Engineering Contradiction:

Improveability to impose various conditions including stretchingVSAvoidsimplified and versatile setup

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The device incorporates pre-configured linkage assemblies and standardized attachment mechanisms that are prepared in advance for common joint types and exercise conditions. Adjustment mechanisms are pre-positioned with clear indicators and quick-release features, allowing users to switch between different configurations without complex assembly procedures. The actuator systems come pre-calibrated for standard range of motion parameters.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The exercise device is divided into modular segments including separate linkage arms, adjustable actuators, and independent attachment points. Each segment can be independently positioned and configured, allowing simple step-by-step setup rather than requiring complex overall reconfiguration. The segmented design enables localized adjustments without affecting the entire system.

Inventive Principle:

Principle #1Segmentation

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

Provides flexible and adaptable joint exercise or movement, enabling precise control over stretching and movement conditions, with a simplified and versatile setup suitable for both right and left joints.

Implementation Method 1

a flexion-extension actuator operatively engaged with the first link member and the intermediate linkage to drive movement of the second link member with respect to the first link member

Methodology Applied

Scientific EffectLinear actuator: Linear Motor

Implementation Method 2

The distal end portion has a distal gear portion... The bridge link has a bridge-link geared portion operatively engaged with the distal gear portion of the first link member

Methodology Applied

Scientific EffectGear mechanism: Gear

Data Source

PatentUS12558282B2Powered range-of-motion device with linear actuator for movement of the limb

Publication Date: 2026.02.24 PHYSIOHAB LLC

AI summary

A range-of-motion device for a joint includes first and second link members for securing to a first and a second limb connected by the joint. A flexion-extension actuator drives movement of the second link member with respect to the first link member. An intermediate linkage may engage the first and second link members. A base link may engage the first link member and may be supported by a transverse support member. A vertical support frame may support the transverse support member. The transverse support member may be configured to provide free pivoting within a free-pivoting range of motion of the base link with respect to the transverse support member.