Cannulated Drill Stylet for K-Wire Guidance
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Solution Overview
Problem
In minimally invasive spine surgery, particularly when using pedicel screws, the existing medical drilling devices face challenges as the drill must be removed to insert a K-wire, and the bone substance enters the drill's longitudinal channel, making it difficult to guide the K-wire accurately.
Innovation Solution
The medical drilling device features a mandrin that fills the longitudinal channel, preventing bone substance from entering and allowing the drill to be used as a guide for the K-wire without needing to be removed. The mandrin acts as a locking element, ensuring the K-wire can be placed in a defined manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cannulated drill bit is used to drill into the bone, then the longitudinal channel is created for K-wire insertion, but bone substance penetrates and blocks the longitudinal channel, preventing direct K-wire insertion
Solution Approach 1:
A stylet is inserted into the longitudinal channel of the cannulated drill bit before drilling begins. The stylet prevents bone substance from penetrating and blocking the channel during the drilling process, ensuring the channel remains clear for subsequent K-wire insertion without requiring drill bit removal.
Solution Approach 2:
The stylet acts as an intermediary element between the drill bit and the K-wire. It temporarily occupies the longitudinal channel to prevent contamination by bone substance, then is removed to allow the K-wire to pass through the same channel, serving as a protective mediator throughout the procedure.
2Ease of operation
If the drill bit is removed to insert the K-wire, then the K-wire can be inserted, but the entry point location is lost and handling complexity increases
Solution Approach 1:
The stylet is inserted into the longitudinal channel before drilling to maintain channel patency. This preliminary action eliminates the need to remove the drill bit afterward, allowing continuous guidance and direct K-wire insertion through the same channel, thereby preserving entry point location and reducing procedural steps.
3Reliability
If the stylet completely fills the longitudinal channel, then bone substance is prevented from entering, but the drill structure becomes more complex
Solution Approach 1:
The stylet serves multiple functions: it prevents bone substance from entering the longitudinal channel, maintains channel patency, and can be easily removed to allow K-wire insertion. This multi-functional design protects the channel without requiring additional complex structures or components.
Data Source
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AI summary
The invention relates to a medical drill device comprising a cannulated drill with a longitudinal channel which extends coaxially to the longitudinal axis of the drill. The drill device comprises a drill device coupling section at a proximal end for coupling to a handle or a drill machine in a rotationally fixed manner. The drill has a distal and a proximal end, and the drill device comprises a chuck with a distal chuck section and a proximal chuck section, wherein the distal chuck section is designed to insert and close the longitudinal channel of the drill over the entire length or substantially the entire length of the drill in a drilling position, and the drill comprises a drill coupling section in the region of the proximal end of the drill, said drill coupling section together with the proximal chuck section forming the drill device coupling section. The invention additionally relates to an improved medical drill system.