How a Surgical Robot Attaches Tools and Stays Sterile

Intuitive Surgical's patent details a robotic surgical system that securely mounts medical instruments, transfers precise movements, and ensures sterility through a unique rotating drape mechanism.

What it covers

This surgical system uses a robot arm to hold and control medical instruments. It features an "instrument manipulator interface" that can attach and detach a medical instrument, placing it in a "mounted state." This interface has multiple "actuator outputs" that connect to matching inputs on the instrument, allowing the robot to transfer control forces, like opening and closing surgical jaws. A key feature is that these actuator outputs extend from the mounting surface in directions "substantially parallel to a shaft" of the medical instrument (Claim 1). Once mounted, the instrument and its interface can rotate together around a "roll axis" relative to the robot arm's end, which helps with precise movements during surgery. The system also includes a "sterile drape assembly" with a "rotatable seal" (Claim 1) to keep the surgical area clean even as the instrument rotates.

What it doesn't cover

• —Does not cover surgical systems where instruments are permanently attached to the robot arm, as it specifies a "removably couple" mechanism.
• —Does not cover systems where the actuator outputs are not aligned parallel to the instrument's shaft, which is a specific claim requirement.
• —Does not cover systems without a sterile drape assembly that includes a rotatable seal between the instrument interface and the arm.
• —Does not cover systems where the instrument and its interface cannot rotate together about a roll axis relative to the arm's distal link.

The clever bit

The clever part is the combination of actuator outputs extending parallel to the instrument's shaft, allowing for a compact and robust connection, with a sterile drape assembly that includes a rotatable seal. This seal enables the instrument to spin freely around its "roll axis" without breaking the sterile barrier, which is essential for complex surgical maneuvers.

Why it matters

This patent describes improvements to robotic surgical systems, which are crucial for minimally invasive procedures. By ensuring instruments can be securely attached, precisely controlled, and rotated while maintaining a sterile field, it contributes to safer and more effective surgeries. Such innovations help surgeons perform complex tasks with enhanced dexterity and vision, reducing patient recovery times and complications.

Real-world examples

• 1.Intuitive Surgical da Vinci surgical systems
• 2.Other advanced robotic surgery platforms