Arcuate Guiding Kit With Radially Expandable Bone Cutter

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing arthroscopic procedures for Anterior Cruciate Ligament Reconstruction face challenges in accurately creating bone tunnels of varying diameters, with existing tools risking tunnel malposition and misalignment, and requiring multiple drilling passes.

Innovation Solution

A kit comprising a guiding system with a cannulated drill guide and a bone material removal device featuring a radially expandable cutting portion and a cannula, allowing for precise formation of bone tunnels with adjustable diameters by combining anterograde and retrograde drilling techniques.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a fixed-diameter drill guide is used, then the drilling process is simple, but the bone tunnel diameter cannot be adjusted

Engineering Contradiction:

Improvebone tunnel diameter adjustmentVSAvoiddrill guide structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The drill guide incorporates a radially expandable cutting portion that can dynamically change the effective diameter of the bone material removal device. The cutting portion expands radially outward from the longitudinal shaft, allowing the same device to create bone tunnels of varying diameters without requiring multiple fixed-diameter guides

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the physical parameter of the cutting portion by allowing radial expansion. The cutting portion transitions from a compact state within the longitudinal shaft to an expanded state where it protrudes radially outward, effectively changing the diameter parameter to match different bone tunnel requirements

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If multiple drilling passes are used, then various diameters can be achieved, but the surgical time increases

Engineering Contradiction:

Improvebone tunnel diameterVSAvoidsurgical time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The bone material removal device combines multiple functions in a single tool. The radially expandable cutting portion allows one device to perform the work of multiple fixed-diameter drills, enabling creation of various bone tunnel diameters in a single passing motion without requiring sequential drilling passes

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The expandable cutting portion enables continuous bone removal across different diameter requirements. Instead of stopping to change drills or make multiple passes, the cutting portion can be adjusted radially during the drilling process, maintaining continuous useful action and reducing surgical time

Inventive Principle:

Principle #20Continuity of useful action

3Productivity

If the cutting portion is always extended, then bone material removal is efficient, but the device cannot be inserted through the guiding cannula

Engineering Contradiction:

Improvebone material removal efficiencyVSAvoiddevice insertion capability

Core Design Contradiction:

ProductivityVSLength of moving object

Solution Approach 1:

The cutting portion dynamically changes its configuration based on operational needs. During insertion through the guiding cannula, the cutting portion is retracted into the longitudinal shaft to minimize the device profile. During bone removal, the cutting portion is extended radially outward to maximize cutting efficiency

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The cutting portion is designed to nest within the longitudinal shaft when not in use. This nesting arrangement allows the extended cutting portion to be stored compactly within the body of the device, enabling insertion through the guiding cannula while maintaining the capability for efficient bone removal when extended

Inventive Principle:

Principle #7Nested doll (Nesting)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The kit enables accurate and efficient creation of bone tunnels with varying diameters, reducing the risk of misalignment and minimizing the number of drilling passes, thereby enhancing surgical precision and stability.

Implementation Method 1

a radially expandable cutting portion having a longitudinally-oriented cutting edge, the radial expansion comprising an increase of a cross-sectional diameter of the bone material removal device at the longitudinal position of the expandable cutting portion

Methodology Applied

Scientific EffectRadial expansion:

Data Source

PatentEP4233741B1A kit including a guiding system and a bone material removal device

Publication Date: 2025.10.08 T A G MEDICAL DEVICES-AGRICULTURE COOPERATIVE LTD

Figure 1A~1B
Figure 2A~2D
Figure 2E~2F

AI summary

A kit including a guiding system and a bone material removal device, including an arcuate element, a guiding element configured to be attached to the arcuate element, a cannula, slidably insertable into a portion of the arcuate element, a cannulated bone material removal device having a longitudinal shaft, which is axially displaceable within the cannula.