Invacare Matrx PB Deep Wheelchair Positioning Back

The Invacare Matrx PB Deep Wheelchair Positioning Back is designed for users who need more support than a standard contoured back. With a deep 7-inch contour, this positioning back provides stronger midline support, improved trunk stability, and better overall posture for everyday wheelchair seating. It is a strong solution for users with moderate to high lateral trunk positioning needs. :

Need help choosing the right wheelchair back system? Call 866-218-0902 to speak with a specialist.

Quick Summary

• 7" deep contour for stronger positioning and trunk support
• Designed for moderate to high lateral support needs
• Molded foam over a lightweight rigid shell
• Easy Set hardware with angle and depth adjustment
• Available in multiple widths and heights

Why Choose the Invacare Matrx PB Deep Back?

The Matrx PB Deep is a smart choice for wheelchair users who need more than entry-level back support but do not necessarily need a highly aggressive custom system. Its deeper contour helps maintain alignment, supports the torso more effectively, and improves seated stability throughout the day. Official and retailer specifications describe it as a back designed for increased midline support and positioning with a broad size range for different users. 

Compared with a standard posture back, the PB Deep adds more wraparound support and positioning control. That makes it especially useful for users with reduced trunk control, posture challenges, or those who spend long hours in their wheelchair.

Key Features

• 7" Deep Contour: Provides enhanced midline and lateral trunk support 
• Molded Foam Cushioning: Wraps around the shell for comfort and protection 
• Rigid Lightweight Shell: Adds structure without excessive weight 
• Easy Set Hardware: Allows quick installation and adjustment 
• Depth and Angle Adjustment: Up to 4" depth adjustment and 40° angle adjustment range 
• Headrest Reinforcement Plate: Built-in plate supports headrest attachment on compatible setups

Who Is This Back Best For?

• Wheelchair users needing moderate to high positioning support
• Users with reduced trunk control
• Individuals who need more support than a standard contoured back
• Long-term wheelchair users seeking better stability and posture

Key Specifications

• Brand: Invacare
• Model: Matrx PB Deep
• Product Type: Wheelchair positioning back support system
• Contour Depth: 7 inches 
• Widths: Common sizes include 14", 16", 17", 18", and 20" 
• Heights: Common heights include 12", 16", and 20" 
• Depth Adjustment: 4" total adjustment range :
• Angle Adjustment: 40° range 
• Product Weight: About 4 lb. for standard PB Deep models 
• Weight Capacity: Commonly listed at 300 lb. for standard PB Deep models, with heavy-duty variants listed separately at higher capacities 
• Warranty: 2-year limited warranty 

Frequently Asked Questions

What is the difference between the Matrx PB and the Matrx PB Deep?

The standard Matrx PB is a moderate contour back, while the PB Deep adds a deeper 7-inch contour for stronger trunk support, more wraparound positioning, and increased midline control. 

Who should use the Matrx PB Deep?

This model is best for wheelchair users who need moderate to high lateral trunk positioning support and want more stability than a basic contoured back can provide. 

Is the Matrx PB Deep a pressure relief cushion?

No. The PB Deep is a wheelchair back support system. Pressure relief is usually handled by the seat cushion, while the back focuses on posture, alignment, and upper body support.

What is the contour depth?

The Matrx PB Deep has a 7-inch contour depth, which helps provide stronger positioning support than the standard PB model. 

Will it fit most wheelchairs?

It is designed to fit many standard wheelchairs and includes adjustable hardware. Published specifications also note that the mounting system can accommodate chairs slightly narrower or wider than the selected back width, depending on setup. 

Can the back angle be adjusted?

Yes. The hardware allows angle and depth adjustment so the setup can be tuned for positioning and comfort.

Does it include foam padding?

Yes. The PB Deep uses molded foam over a rigid shell to combine comfort with structured positioning support.Is there a heavy-duty version?

Yes. Published Matrx specifications show separate heavy-duty PB Deep variants with higher weight capacities, while standard PB Deep models are commonly listed at 300 lb. 

Upgrade Your Wheelchair Seating System

Pair the Invacare Matrx PB Deep with a pressure relief seat cushion to create a more complete seating system for posture, comfort, and long-term support.

Call 866-218-0902 for help choosing the right wheelchair seating and positioning system.