CD116 Proximal Lock

Dale Perkins, CPO

Dale began to develop unique fitting techniques for above-the-knee amputees after the birth of his second son Matt, an AK amputee. A number of different techniques and components can be determined by the patient’s limb and preferences.

One of the more recent techniques features a casting technique that allows the amputee to comfortably lay down while creating a mould using non-invasive methods.

The fitting is done with a locking system called the Proximal Lock (developed in part by Coyote P&O) along with a gel liner. These two components combine a good fitting "suction" system, with a back-up locking mechanism which also controls rotation.

This results in optimal comfort and convenience and does not require space at the bottom of the limb, helping to maintain a correct knee centre.

CD 116 Proximal Lock


Ideal for controlling rotation, retro fitting and also flexible for ease of donning & doffing !



CD116-lock-socketBilling:   The Proximal Lock will bill just like a distal pin lock system (L5671). Gluing the lock to the liner turns the Proximal Lock from a cushion liner to a locking liner (L5673).

Improved Suspension:   We recommend adding an expulsion valve to most sockets that use the Proximal Lock. This helps with donning and will evacuate the maximum amount of air from the socket which improves suspension and reduces pistoning.

Limb Type:   The Proximal Lock was designed to work with long limbs and can be the primary suspension for patients who may not have room distally for other lock options. The Proximal Lock can be used for short limbs only with a distal pin; in this case, the Proximal Lock will act only as rotational control.

Retrofitting:   The lock can be retrofitted to an existing socket or put on the outside of a test socket.
Test Socket:   Initial fitting of the socket should be done without the lock. For extended test periods the lock can be retrofit to the socket.

Silicone liner attachment helps with easy donning. It also helps seal the exit hole for the tab.

Lock is easy to don, can be attached with a provided fabrication dummy or can retrofit on an existing socket.

The Tab creates a simple visual locking mechanism working well for all activity levels including geriatric, paediatric or people who need assistance donning and doffing their prosthetic.

Zero clearance lock allows for the use of any connector. Seen here with the CD103AF Alignable Fast Four Connector.

  • Zero clearance lock
  • Controls rotation
  • Use with your choice of distal adapters
  • Ideal for long limbs with minimal clearance
  • Larger attachment distributes more tension
  • Flexible attachment rolls on easier
  • Can be used with seal band liners
  • Adhesive included with each lock
  • Lock can be retrofit
  • Bills like a distal pin lock system (L5671)

Step by Step Fabrication Guide

Click for CD116 Fabrication info

The CD101 Summit Lock, and CD102 LowPro Summit Lock are still available, however because of the improved liner attachment, and easier-to-use glue, we strongly suggest using the Proximal Lock instead.