Time-Spaced Robotic Reference Frames for Unobstructed Navigation

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Solution Overview

Problem

Navigated robotic procedures face challenges with large reference frames that obstruct the operation field, are cumbersome, and are less stable, while smaller frames provide less accuracy.

Innovation Solution

A robotic arm creates a time-spaced reference frame by moving to multiple poses, allowing a tracking marker sensor to capture its position in navigation space, forming a 'giant' reference frame without physical obstruction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a large physical reference frame is used to improve accuracy, then measurement precision is improved, but the reference frame obstructs the operation field and becomes cumbersome

Engineering Contradiction:
Improvenavigation accuracyVSAvoidoperation field accessibility
Core Design Contradiction:
Measurement precisionVSEase of operation

Solution Approach 1:

The patent transitions from a spatial reference frame to a temporal reference frame. Instead of using a large physical structure in space, the system uses a small physical marker that is captured at multiple time points (multiple poses) to define a virtual reference frame. This dimensional shift from space to time resolves the contradiction by achieving large reference frame accuracy without the physical obstruction of a large structure.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent creates a virtual copy of a large reference frame by capturing the position of a small physical marker at multiple poses. The sequence of marker positions is processed to generate a virtual reference frame that has the same navigational utility as a large physical frame but without the physical bulk. This copying approach allows accurate navigation while keeping the operation field accessible.

Inventive Principle:
Principle #26Copying

2Ease of operation

If a small reference frame is used to improve ease of operation, then operation field accessibility is improved, but measurement precision deteriorates

Engineering Contradiction:
Improveoperation field accessibilityVSAvoidnavigation accuracy
Core Design Contradiction:
Ease of operationVSMeasurement precision

Solution Approach 1:

The system compensates for the small physical size of the marker by extending its effective reference volume into the time dimension. By capturing the marker at multiple poses (different times and positions), the system constructs a virtual reference frame with large spatial extent, thereby achieving high navigation accuracy with a small physical marker that does not obstruct the operation field.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The reference frame is made dynamic rather than static. Instead of a fixed large structure, the system uses a small marker that moves through multiple poses to dynamically define the reference frame. This dynamic approach allows the reference information to be distributed throughout the navigation volume without requiring a large static structure, thus maintaining both accuracy and ease of operation.

Inventive Principle:
Principle #15Dynamics

3Stability of the object's composition

If a large physical reference frame is used to improve stability, then reference frame stability is improved, but the structure becomes cumbersome and less stable

Engineering Contradiction:
Improvereference frame stabilityVSAvoidreference frame structure
Core Design Contradiction:
Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent replaces the need for a large, complex, and potentially unstable physical reference frame with a computational copy created from multiple marker positions. The virtual reference frame derived from processing marker data across multiple poses provides stable reference information without the structural complexity and physical instability issues of large mechanical frames.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

The system replaces the mechanical reference frame structure with an information-based computational system. Instead of relying on the physical stability of a large mechanical structure, the reference frame stability is achieved through computational processing of marker positions, substituting mechanical stability with information processing stability.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12426964B2Time-spaced robotic reference frames
Publication Date: 2025.09.30 MAZOR ROBOTICS
  • US12426964B2 patent drawing
  • US12426964B2 patent drawing
  • US12426964B2 patent drawing

AI summary

A robotic navigation system includes a robot base (140); a robotic arm (144) comprising a proximal portion secured to the robot base, a distal portion movable relative to the proximal portion, and a tracking marker (156) secured to the robotic arm proximate the distal portion; at least one processor; a navigation system including a tracking marker sensor configured to identify positions of the tracking marker in a first coordinate space; and a memory. The memory stores instructions that cause the at least one processor to: cause the robotic arm (144) to move to a plurality of different poses; receive information relating to a position of the tracking marker (156) in a second coordinate space when the robotic arm is in each of the plurality of different poses; and compare the positions of the tracking marker in the first coordinate space to the positions of the tracking marker in the second coordinate space.