Bone Harvesting Caliper and Cutting Assembly for Precise Grafts

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Solution Overview

Problem

Current autologous bone harvesting and processing techniques face challenges in achieving precise bone harvesting and processing, often leading to iatrogenic fractures, bleeding, hematoma, infection, and difficulty in ensuring uniform shapes and sizes, particularly when large amounts of bone are required.

Innovation Solution

A composite device comprising a bone harvesting auxiliary device with a bone harvesting caliper and depth-limiting Kirschner wires, and a bone processing device with a bone box and cutting assembly, designed for precise bone extraction and efficient processing into various shapes and sizes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If bone chisels and bone hammers are used for bone harvesting, then bone harvesting can be performed, but precise bone harvesting cannot be ensured and iatrogenic fractures may occur

Engineering Contradiction:

Improvebone harvesting precisionVSAvoidiatrogenic fractures

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a bone harvesting caliper as an intermediary measuring tool between the surgeon and the bone. The caliper includes depth-limiting Kirschner wires that act as mediators to precisely control the depth and location of bone harvesting, preventing direct contact between heavy bone hammers and the bone surface, thereby eliminating iatrogenic fractures while ensuring precise harvesting.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If bone scissors and bone chisels are used for bone processing, then bone morphology can be processed, but uniform shapes and sizes cannot be ensured and contamination risk increases

Engineering Contradiction:

Improvebone shape uniformityVSAvoidcontamination risk

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the traditional mechanical bone processing system (bone scissors and bone chisels) with a specialized bone processing device featuring a rotating cutting blade. This new mechanical system provides controlled, uniform cutting through rotational motion with fixed depth control, ensuring consistent bone chip sizes and shapes while reducing the number of repeated cutting motions that cause contamination.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Quantity of substance

If large amounts of autologous bone are harvested from iliac crest, then grafting needs can be met, but the limited available bone becomes insufficient

Engineering Contradiction:

Improveamount of bone graft materialVSAvoidbone availability

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The patent applies preliminary action by using the bone harvesting caliper to pre-measure and mark the optimal harvesting area on the iliac crest before actual bone harvesting begins. The caliper allows surgeons to plan and visualize the exact amount and location of bone to be harvested, maximizing the available bone volume from the iliac crest before surgery commences, thereby ensuring sufficient graft material can be obtained without excessive harvesting.

Inventive Principle:

Principle #10Preliminary action

4Adaptability or versatility

If repeated cutting is performed for bone processing, then bone morphology can be adjusted, but contamination risk increases and time is consumed

Engineering Contradiction:

Improvebone morphology controlVSAvoidbone processing time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent implements continuity of useful action through the rotating cutting blade mechanism that continuously removes bone material in a controlled manner. Instead of repeated stop-and-cut motions with bone scissors, the rotating blade maintains continuous contact with the bone surface, systematically shaping bone chips and granules in a single continuous operation, thereby reducing processing time and minimizing exposure to contamination risks.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS20260102170A1Composite device for autologous bone harvesting and bone processing

Publication Date: 2026.04.16 THE FOURTH MEDICAL CENT OF THE CHINESE PEOPLES LIBERATION ARMY GENERAL HOSPITAL

AI summary

The present invention relates to the technical field of bone processing, and in particular to a composite device for autologous bone harvesting and bone processing, including: a bone harvesting auxiliary device and a bone processing device. The bone harvesting auxiliary device includes: a bone harvesting caliper, a guide sleeve, and a depth-limiting Kirschner wire. The bone processing device includes: a bone box, a fastening assembly, and a cutting assembly. The composite device for autologous bone harvesting and bone processing in the present invention is capable of precise harvesting based on preoperative imaging measurements, thereby preventing resource waste. Intraoperatively, the device can obtain cancellous bone, unicortical bone, bicortical bone, and tricortical bone. In addition, various finished bone products of different shapes and sizes can be prepared according to requirements for a bone grafting area, such as bone granules, bone strips, bone chips, and bone blocks.