Product News

Coyote Air-Lock: How Its Dual-Suspension System Works

Written by Bryan Potok, CPO on June 4, 2018
Last updated on October 29, 2026

Choosing the right prosthetic device is a delicate balance between comfort and reliability, and varying experiences and studies make it a toss-up between two common suspension technologies—suction and pin. But Coyote Design, acknowledging the benefits of both approaches, asks why pick one when you can have both?

With this vision in mind, they created the Air-Lock technology, which uses both suspension modes so prosthetic users can live as actively as they prefer without stressing over suspension.

A delicate balance between comfort and reliability for prosthetics

Types of Suspension

Suction suspension works by creating adhesion between the gel sleeve and the socket, securing the socket to the residual limb. Pin system suspension, on the other hand, relies on a metal pin that locks onto a connector at the bottom of the socket.

Unlike pin suspension, which pulls on limb tissue (imagine a "milking" motion applied to your limb as you walk), suction suspension can help distribute suspension forces across the residual limb and reduce certain types of movement within the socket. This may decrease the pulling sensation sometimes associated with pin-lock systems. However, comfort and skin health also depend on socket fit, residual limb volume, liner selection, and individual needs.

Airlock Technology

Coyote's Airlock Technology is a patented design that combines the comfort of suction suspension with the safety and security of pin suspension.

Airlock still uses a pin suspension, but it employs a suction that's akin to a syringe with its hole plugged at the bottom, spreading the suspension throughout the socket and alleviating pressure on your limb, particularly in the area of the socket that contacts the pin. As a result, the lock prevents air from entering the socket from the bottom.

According to Coyote Design, Air-Lock can provide additional suction-based suspension even without an external suspension sleeve. Its airtight mechanism is designed to reduce pistoning by limiting air entry through the bottom of the socket. Pistoning is the vertical up-and-down movement made by your prosthesis while walking, which causes the socket to rub against your limb, creating traction and friction. However, the amount of suspension achieved depends on the socket design, residual limb characteristics, and proper fitting.

Air-Lock's lightweight construction and relatively simple locking mechanism are built for durability and everyday use. Coyote also describes the system as water-resistant and notes that reducing distal traction may help reduce wear on compatible prosthetic liners. However, liner lifespan still depends on factors such as fit, activity level, cleaning practices, and regular maintenance.

Although Air-Lock uses suction to supplement its pin-lock mechanism, it is not an elevated vacuum suspension system. Coyote specifically advises against using the standard Air-Lock with elevated vacuum.

The bottom line

Coyote Design's Air-Lock offers an alternative for prosthesis users who may benefit from combining pin-lock security with suction-based suspension. Its design aims to reduce unwanted socket movement while maintaining a relatively lightweight locking mechanism. Whether it's the right choice depends on your residual limb, socket design, activity needs, and personal preferences.

Consult your prosthetist to determine whether Air-Lock or another suspension system would best support your comfort and mobility.