Summary: Point Designs has launched the Merge MID, a custom body-powered finger prosthesis designed to restore function and independence for patients with middle-phalanx amputations of digits 2–5.

Key Takeaways:

  • Addresses an unmet clinical need: Approximately 13,000 patients experience middle-segment finger amputations annually, yet fewer than 4% receive a prosthetic solution.
  • Uses intuitive, body-powered movement: The device translates residual proximal interphalangeal (PIP) joint motion into distal interphalangeal (DIP) joint movement without external power.
  • Designed for personalized fit and durability: Custom fabrication, an adaptive suspension system, and durable, replaceable components support comfort, functional use, and easier maintenance.

Point Designs has announced the launch of the Merge MID, a custom body-powered prosthesis designed specifically for patients with middle-phalanx amputations of digits 2–5. While approximately 13,000 patients per year experience middle-segment amputations, fewer than 4% currently receive a prosthetic solution. According to the company, Merge MID represents a breakthrough in addressing this clinical gap, bringing proven prosthetic engineering to body-powered solutions that work seamlessly with patients’ residual anatomy. 

“We’ve always been driven by a single mission: to restore function and independence for people with partial-hand amputation,” said Levin Sliker, vice president and general manager of Point Designs. “Merge MID expands that mission into a category we hadn’t yet addressed: body-powered solutions. It reflects our commitment to rigorous engineering, clinical collaboration, and genuine patient-centered design, delivering something that works—really works—for everyone involved.”

Who it is for: 

The Merge MID is intended for patients with amputations through the middle phalanx of digits 2–5 who retain sufficient residual finger length and active PIP joint motion to drive the prosthesis. Point Designs’ clinical team reviews patient measurements and photographs to confirm candidacy and ensure the best possible outcomes.

How it Works: 

  • The Merge MID uses the remaining proximal interphalangeal (PIP) joint motion to drive and reproduce distal interphalangeal (DIP) joint motion. As the residual finger bends and straightens, the prosthesis moves intuitively through flexion and extension—providing natural, body-powered control without external power sources or complex training requirements.
  • The Merge MID mirrors natural finger motion and positioning with a low-profile design that delivers anatomical alignment and comfortable, functional wear—especially important for positioning adjacent to surrounding fingers.
  • The dynamic proximal ring and flexible suspension system accommodate a broad range of patient presentations. The FlexRing Entry System expands during donning to conform around the residual finger for a secure, adaptive fit that supports both comfort and function.
  • A guided measurement and ordering process accelerates delivery of custom-fabricated prostheses. This streamlined approach reduces the time from clinical evaluation to everyday use, helping patients return to their daily activities sooner.
  • Engineered for dependable everyday use, the Merge MID features durable titanium, stainless steel, and nylon components that provide lightweight strength and withstand daily wear. When service is needed, easily replaceable components simplify repairs and minimize downtime.

The Merge MID is now available for order through Point Designs’ streamlined custom fabrication process. For more information about candidacy, ordering, and clinical resources, visit the Merge MID page.