Enhanced Four-Wheel Knee Walker with Adaptive Steering

Publication ID: 24-11857485_0006_PTD

Published: October 28, 2025

Category:Direct Improvements & Enhancements

Legal Citation

pr1or.art Inc., “Enhanced Four-Wheel Knee Walker with Adaptive Steering,” Published Technical Disclosure No. 24-11857485_0006_PTD, Published October 28, 2025, available at https://archive.pr1or.art/24-11857485_0006_PTD

This technical disclosure describes improvements that would be readily apparent to a Person Having Ordinary Skill In The Art (PHOSITA) when considered in combination with the foundational architecture disclosed in U.S. Patent No. 11,857,485.

Summary of the Inventive Concept

The present inventive concept relates to an advanced knee walker with four-wheel steering, featuring adaptive steering sensitivity, stability enhancement, customizable steering response, obstacle detection, and modular design for improved maneuverability, safety, and user experience.

Background and Problem Solved

The original knee walker with four-wheel steering patent (US1234567) provides improved maneuverability and stability in turning. However, it lacks adaptive features to accommodate varying user needs, terrain, and mobility requirements. The present inventive concept addresses these limitations by introducing advanced steering capabilities, enhancing the overall user experience and safety.

Detailed Description of the Inventive Concept

The enhanced four-wheel knee walker features a user-input device, processing unit, and actuation mechanism to adjust steering sensitivity based on user input. Additionally, a stability enhancement system dynamically adjusts the distribution of weight between the front and rear axles to improve turning stability. The knee walker also incorporates a sensor system to detect obstacles and automatically adjust the steering response to avoid collision. Furthermore, the modular design allows users to customize the steering response and adapt to different terrain or mobility requirements. The system can be configured to accommodate various user preferences, ensuring a more personalized and efficient mobility experience.

Novelty and Inventive Step

The new claims introduce novel and non-obvious features, including adaptive steering sensitivity, stability enhancement, customizable steering response, obstacle detection, and modular design. These advancements significantly improve the original knee walker's performance, safety, and user experience, distinguishing the present inventive concept from the prior art.

Alternative Embodiments and Variations

Alternative embodiments may include integrating the adaptive steering system with wearable devices, incorporating AI-powered obstacle detection, or developing specialized knee walkers for specific industries, such as healthcare or construction. Variations may also involve different materials, designs, or configurations for the modular steering components.

Potential Commercial Applications and Market

The enhanced four-wheel knee walker has vast commercial potential in the mobility aids market, targeting users with knee, lower leg, ankle, or foot injuries. The adaptive features and modular design make it an attractive solution for various industries, including healthcare, rehabilitation, and construction, where mobility and safety are paramount.

CPC Classifications

Section	Class	Group
A	A61	A61H3/04
B	B62	B62K5/003
B	B62	B62K25/02
A	A61	A61H2003/005
A	A61	A61H2003/046
B	B62	B62K2025/025

Section 103 Obviousness Analysis (PHOSITA)

▼

Field of Art

Mobility assistive devices, specifically knee walkers and ambulatory support systems, involving mechanical engineering, biomechanical design, and assistive technology for medical mobility solutions

Person of Ordinary Skill (PHOSITA) Profile

A mechanical engineer or medical device designer with expertise in mobility assistive technologies, familiar with four-wheel steering mechanisms, biomechanical load distribution, and adaptive mobility system design

Obviousness Rationale

A PHOSITA would recognize that the PTD's adaptive steering and stability enhancement represent predictable technological improvements to the existing knee walker design. The proposed variations leverage standard control systems, sensor technologies, and modular design principles that are well-established in mobility assistive device engineering. The incremental enhancements to steering sensitivity, obstacle detection, and customizable response would be considered obvious extensions of the source patent's fundamental four-wheel steering concept.

Obvious Combinations & Variations

Source Patent Element

Four-wheel steering mechanism with linkage connections between axle assemblies

PTD Variation

Adding user-input driven adaptive steering sensitivity through electronic processing unit

Obviousness Reasoning

Implementing electronic control of mechanical steering is a known technique in mobility devices, representing a predictable application of microcontroller technology to enhance user experience

Source Patent Element

Crossbar-based frame design with front and rear axle configurations

PTD Variation

Dynamic weight distribution system between front and rear axles during turning

Obviousness Reasoning

Optimizing weight transfer during mobility is a standard engineering approach for improving stability, utilizing well-understood mechanical principles

Source Patent Element

Tie-rod and cable linkage mechanisms for steering control

PTD Variation

Sensor-based obstacle detection system that automatically adjusts steering response

Obviousness Reasoning

Integrating sensor feedback into mechanical steering systems is a predictable solution for enhancing safety, using established robotics and assistive technology design approaches

Source Patent Element

Basic four-wheel knee walker frame structure

PTD Variation

Modular design with interchangeable steering components

Obviousness Reasoning

Creating modular, customizable medical devices is a common design strategy to accommodate diverse user needs, representing an obvious design optimization

Source Patent Element

Mechanical steering column connected to frame

PTD Variation

AI-powered adaptive steering response integrated with wearable device interfaces

Obviousness Reasoning

Extending mechanical steering with smart electronic interfaces is a predictable technological progression using standard control system integration techniques

35 U.S.C. § 103 Summary: Based on the teachings of US Patent 11857485 and the disclosed technical variations, a person having ordinary skill in the art would find the proposed knee walker enhancements obvious and lacking inventive step. The incremental improvements in adaptive steering, stability control, and modular design represent predictable technological extensions that would be readily conceived by a skilled practitioner in mobility assistive device engineering.

Original Patent Information

Patent Number	US 11,857,485
Title	Knee walker with four-wheel steering
Assignee(s)	ROVER MOBILITY, LLC