Bone Mill+ Autograft Processing and Milling

bonemill+ in front of surgeons in OR
The Story

Developing the gold-standard for automated bone prep and milling

Spinal fusion surgery often requires that bone be harvested from the patient, reduced to a small and consistent size, and reintroduced into the patient to promote bone growth. Several years ago, Stryker identified an opportunity to replace this painstaking, manual process with an efficient powered solution – the Bone Mill. After the Bone Mill made them a market leader, Stryker sought to redesign the power base and mill, and develop a new disposable that enables automated tissue removal prior to milling. The resulting Bone Mill+ provides more advantages than ever before.

Bonemill+ on a white background
Our Solution

Combining existing, trusted features with new design enhancements

  1. Prep+ cartridge that converts arduous, manual tissue removal from harvested bone into an easy, automated process.
  2. Refined plunger design and shape that enhances functionality.
  3. Transparent lid and hopper for visibility during processing.
  4. Redesigned catch tray that increases volume and ease of use.
  5. New power handle for multiple firm grip points.
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The Details

Making It Modular

The interchangeable Prep+ cartridge and Mill+ disposables provide two major stages for bone preparation. The Mill+ disposable comes in three blade size options, which gives users the ability to customize particle size by procedure and helps facilitate fast setup and operation.

bonemill+ exploded view
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top view of bonemill+ on dark background
The Details

Addressing an Unmet Need

Working through our stakeholder-centered design process, we identified that the bone cleaning process was ripe for improvements in effort and ease of use. So we prioritized a design that would reduce glove punctures, physical effort, and potential for injury.

"The award winning Mill is a testament to the partnership between M3 Design and Stryker. Great people working together deliver great results!" Mickey Noonan VP of Global Product Excellence at Stryker Instruments
graphic of bonemill+ blade
The Results

Providing more value than ever before

  1. Reduced risk. New design addresses fatigue and injury associated with manual process and reduces glove punctures by 50% versus manual processing.
  2. Faster availability. Two-fold automated process is 99x faster than manual milling and more than 2.5x faster than manual tissue removal.
  3. Consistent quality. Yields 15% higher quality rating of soft tissue removal versus manual processing.
  4. Greater Quantity. Prep+ cartridge yields 46% more bone yield compared to manual cleaning and redesigned catch tray increases volume per milling by 140%.
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