SL4 Upper and Lower Limb Active-Passive Training System

The SL4 Upper and Lower Limb Active-Passive Training and Assessment System provides intelligent motorized rehabilitation for both upper and lower extremities. Through programmable control and feedback mechanisms, the SL4 guides patients through passive, assisted, active, and resistance training modes to improve joint and muscle function and promote neuromuscular control recovery.

Product Overview

Unlike devices targeting only upper or lower limbs, the SL4 offers combined training capabilities that address the rehabilitation needs of patients with multi-limb involvement. The system accommodates patients at various recovery stages through its multiple training modes—from fully passive movement for those with minimal muscle function to active resistance training for those rebuilding strength.

The SL4 integrates virtual scenario tasks for goal-directed training, engaging patients in functional activities that stimulate motor control patterns beyond simple repetitive exercise.

Key Features

SL4 is a single rehabilitation device by Yeecon covering both upper and lower limbs, with passive, assisted, active, and resistance training modes for stroke and neurological recovery.

• Dual Upper and Lower Limb Training: Single device addresses both arms and legs
• Multiple Training Modes: Passive, assisted, active, and resistance protocols
• Intelligent Program Control: Automated exercise sequences with real-time feedback
• Built-in Exercise Programs: Standard, relaxation, strength, and endurance/coordination programs
• Virtual Scenario Training: Task-oriented exercises within computer-generated environments
• Assessment Functions: Evaluation capabilities with data storage and reporting

Training Modes

Passive Mode

For patients with minimal or no voluntary muscle activation, the SL4 drives limb movement through programmed exercise patterns. Passive training helps maintain joint range of motion, prevent muscle atrophy, and provide sensory input to the nervous system.

Assisted Mode

Combines patient effort with machine support, allowing individuals with partial muscle function to complete movements they cannot perform independently. The system detects patient-initiated movement and provides supplemental force as needed.

Active Mode

For patients with recovering muscle strength, active mode provides movement without mechanical assistance. The system monitors performance and provides feedback without adding driving force.

Resistance Mode

Progressive resistance training for patients rebuilding strength. The system applies controlled opposition to patient-generated movement, providing strengthening exercise similar to weight training.

Clinical Applications

The SL4 addresses rehabilitation needs for patients with:

• Stroke: Upper and lower limb dysfunction following cerebrovascular events
• Brain Injury: Motor deficits from traumatic brain injury
• Spinal Cord Injury: Limb weakness or paralysis from spinal cord damage
• Neurological Conditions: Various conditions affecting neuromuscular control
• Joint and Muscle Disorders: Orthopedic conditions requiring mobilization and strengthening

Built-in Training Programs

The SL4 includes pre-programmed exercise protocols designed for different rehabilitation goals:

• Standard Program: General-purpose training for overall function maintenance
• Relaxation Program: Lower-intensity exercise for patients in early recovery or those requiring gentle mobilization
• Strength Program: Progressive resistance protocols for rebuilding muscle power
• Endurance and Coordination Program: Extended exercise sessions focused on stamina and movement coordination

These programs can be selected based on patient needs and modified as recovery progresses.

Virtual Scenario Integration

The SL4 incorporates task-oriented virtual scenarios that give meaning to repetitive exercise movements. Rather than simply performing limb movements in isolation, patients engage in goal-directed activities within computer-generated environments—an approach that research suggests enhances motor learning through task-specific practice and increased patient engagement.

Assessment Capabilities

The system includes evaluation functions that measure and record patient performance during training sessions. Assessment data contributes to treatment planning, progress monitoring, and outcome documentation.

Regulatory Status

Frequently Asked Questions

What is the advantage of combined upper and lower limb training?

Many neurological patients experience dysfunction affecting both upper and lower limbs. The SL4 addresses both in a single device, providing full rehabilitation without requiring separate equipment for arms and legs. This efficiency is valuable for rehabilitation facilities managing equipment budgets and treatment space.

How does the assisted mode work?

In assisted mode, the SL4 detects when patients attempt to move their limbs and provides supplemental force to complete the movement. This “assist-as-needed” approach encourages patient effort while ensuring successful task completion—a balance that supports motor learning while preventing frustration from failed movement attempts.

What conditions is the SL4 most suitable for?

The SL4 is designed for patients with limb dysfunction from stroke, brain injury, spinal cord injury, and other neurological conditions. The multiple training modes make it appropriate across the recovery spectrum, from patients requiring fully passive movement to those ready for active resistance training.