Extendable Bone Rasp With Protective Sheath

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional bone rasps lack effective protection for soft tissues during bone contouring procedures, leading to potential injuries from direct contact with rough surfaces when advancing through orifices and surgical openings.

Innovation Solution

A bone rasp with a protective sheath that allows the rasp portion to extend only when the bone is reached, featuring a tubular body with a locking mechanism to move the rasp portion from a retracted to an extended position, ensuring the rough surface is exposed only at the bone contouring site, thereby minimizing contact with soft tissues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the rasp portion is exposed during advancement through soft tissues, then bone contouring can be performed, but soft tissues may be injured by the rough surface

Engineering Contradiction:

Improvebone contouring capabilityVSAvoidsoft tissue injury

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The rasp portion is nested within the protective sheath during advancement through soft tissues. The sheath completely encloses the rough surface of the rasp, allowing the assembly to pass through orifices and surgical openings without damaging surrounding tissues. Once at the bone, the rasp extends from the sheath to perform contouring.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The protective sheath acts as an intermediary between the rough rasp surface and the soft tissues. It provides a smooth interface that protects tissues during insertion while allowing the rasp to function when needed at the bone site.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the rasp portion is retracted within the protective sheath, then soft tissues are protected, but the rough surface cannot contact the bone for contouring

Engineering Contradiction:

Improvesoft tissue protectionVSAvoidbone contouring capability

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The rasp portion is designed to be dynamically extendable and retractable relative to the protective sheath. It can transition from a retracted state (protected during insertion) to an extended state (exposed for bone contouring), providing both protection and functionality as needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The device is segmented into two functional parts: the protective sheath and the extendable rasp portion. This segmentation allows independent functionality - the sheath provides protection during insertion while the rasp portion can be extended to perform bone contouring when reached.

Inventive Principle:

Principle #1Segmentation

3Object-affected harmful factors

If a protective sheath is added to the bone rasp, then soft tissue protection is improved, but device complexity increases

Engineering Contradiction:

Improvesoft tissue protectionVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The rasp portion is nested within the protective sheath, creating a compact configuration during insertion. This nesting approach protects soft tissues without requiring separate complex mechanisms, as the rasp simply extends from within the sheath when needed.

Inventive Principle:

Principle #7Nested doll (Nesting)

4Ease of operation

If the rasp portion is extended through the sheath, then bone contouring is enabled, but the rough surface contacts soft tissues during advancement

Engineering Contradiction:

Improvebone contouring capabilityVSAvoidsoft tissue contact with rough surface

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The protective sheath is positioned in place before the rasp portion is extended. This preliminary positioning ensures that the rough surface is already protected during the critical advancement phase through soft tissues and orifices, preventing any harmful contact before the rasp reaches the bone.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12016575B1Extendable rasp device and method of making the same

Publication Date: 2024.06.25 BRAWLEY CRAIG CAMERON

AI summary

A bone rasp device with a protective sheath and an extendable and retractable rasp for protection of the skin and soft tissue from the rasp during insertion and removal of the tool. The rasp device includes a tubular body having an interior surface defining a central opening extending between a first end and a second end with the first end defining a first aperture. A rasp portion, including a rough surface opposite a smooth surface, is connected to the tubular body and positioned within the central opening of the tubular body. The rasp portion is moveable relative to the tubular body. In a first position, the rough surface is contained within the central opening, and in a second position, with the rasp portion extends through the first aperture such that the rough surface is positioned outside the central opening and tubular body.