Grooved Bone Reaming Instrument for Low-Damage Implant Holes

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Solution Overview

Problem

Conventional bone drilling instruments cause significant bone damage, leading to loss of bone mass and increased surgical risks such as osteonecrosis, necessitating additional bone substitution operations and higher operational costs.

Innovation Solution

A surgical instrument with a push portion featuring grooves and ribs that guide bone scraps towards the inner wall of the bone, reducing damage by forming a dense layer, and allowing staged reaming with varying diameter push portions to minimize osteonecrosis risk.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a conventional drill blade is used to cut bone, then the implantation hole can be created, but significant bone damage occurs causing loss of bone mass and osteonecrosis

Engineering Contradiction:

Improvehole creationVSAvoidbone damage

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the conventional mechanical blade cutting system with a drilling system that uses rotational force to create the hole. The drill bit rotates to bore through the bone, substituting the sliding blade mechanism with a rotational drilling mechanism that causes less bone damage and osteonecrosis.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operational parameters of bone hole creation by using controlled rotational drilling instead of blade cutting. The drill bit parameters (rotation speed, feed rate, diameter) are optimized to minimize bone damage while effectively creating the implantation hole, thereby reducing osteonecrosis risk.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If multiple push portions with different diameters are used for staged reaming, then bone damage is reduced, but the number of instruments increases

Engineering Contradiction:

Improvebone damageVSAvoidnumber of instruments

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent designs the push portion with a universal structure that can perform multiple functions: it can be used with different drill bits of varying diameters, and the same push portion structure serves for staged reaming operations. This multi-functionality reduces the need for multiple specialized instruments while maintaining the benefit of staged reaming.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent segments the drilling and reaming process into staged operations using a modular push portion design. The push portion can be used in sequence with different diameter drill bits, allowing the surgical procedure to be divided into manageable stages that reduce bone damage while using a consistent instrument platform.

Inventive Principle:

Principle #1Segmentation

3Productivity

If the blade portion cuts bone deeply in one operation, then the implantation hole is created quickly, but osteonecrosis risk increases

Engineering Contradiction:

Improvehole drilling speedVSAvoidosteonecrosis risk

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements periodic action through staged reaming operations. Instead of drilling to full depth in one continuous operation, the process is divided into multiple stages with intermediate reaming steps. This periodic interruption allows bone tissue to adapt and reduces the risk of osteonecrosis while maintaining overall productivity.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies preliminary action by performing initial shallow drilling followed by gradual reaming expansion. The push portion is used in advance to gradually enlarge the hole in controlled stages before final implantation, preparing the bone tissue progressively to minimize trauma and osteonecrosis risk.

Inventive Principle:

Principle #10Preliminary action

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 instrument minimizes bone loss and enhances post-surgery recovery by forming a dense bone layer, reducing osteonecrosis risk and simplifying the surgical process with fewer instruments.

Implementation Method 1

The blade portion of the second end can cut the bone while drilling into the bone

Methodology Applied

Scientific EffectAbrasion: Abrasion

Implementation Method 2

the bone scraps can be pushed along the guiding faces towards the inner wall of the bone, such that the surface can be pushed towards the inner wall of the bone

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS12465370B2Surgical instrument

Publication Date: 2025.11.11 METAL INDS RES & DEV CENT

AI summary

A surgical instrument includes a rod and a push portion. The push portion includes a first end connected to an end of the rod and a second end having a blade portion. The push portion includes a plurality of grooves. The plurality of grooves is recessed in a surface of the push portion and is spaced from each other. Each two adjacent grooves has a rib formed therebetween. A top face of a cross section of each rib is the surface of the push portion. Each rib has a guiding face on the cross section of the push portion. The guiding face is connected to the surface of the push portion. The guiding face faces a rotating direction of the rod. An angle between the guiding face and the surface of the push portion in the cross section is greater than 90°.