Segmented Follicle Punch for Curled Hair Extraction
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Solution Overview
Problem
Conventional hair follicle extraction punches often damage curled follicles during the removal process, making successful transplantation difficult due to the follicles' susceptibility to cutting edges as they penetrate the skin.
Innovation Solution
A punch with a tubular body and distally-extending prong-like members carrying diverging cutting edges separated by slits or slots, allowing the curled hair root to pass through the slit without contact with the cutting edge, minimizing damage during extraction, and optionally using an ultrasonic transducer for precise cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional punch with a continuous cutting edge is used to extract hair follicles, then the punch can effectively cut through the skin and tissue, but curled follicles are damaged or cut by the advancing cutting edge during penetration
Solution Approach 1:
The continuous cutting edge of the punch is segmented into discrete cutting elements separated by spacing. This segmentation creates gaps between cutting edges that allow curled follicles to pass through without contact, while the cutting edges remain effective at cutting tissue. The spacing between cutting edges is specifically designed to accommodate follicle diameters while maintaining cutting effectiveness.
Solution Approach 2:
Spacing elements or non-cutting portions are introduced as intermediaries between the cutting edges. These intermediaries create protective zones where follicles can travel without direct contact with cutting surfaces, while still allowing the cutting edges to effectively sever tissue. The intermediaries act as buffers that prevent harmful direct contact between the follicle and cutting edge.
2Productivity
If the punch cutting edge is advanced directly into the tissue to extract the follicle, then extraction is achieved, but the curled follicle contacts and is damaged by the cutting edge
Solution Approach 1:
The cutting edge is divided into segmented elements with spacing between them, allowing the punch to maintain cutting efficiency while creating protective gaps. The segmented structure enables the punch to advance through tissue effectively while the spacing prevents continuous contact with the follicle, reducing damage during the extraction process.
Solution Approach 2:
The cutting action is applied partially - only where needed to cut tissue - rather than continuously along the entire follicle path. The spacing between cutting edges ensures that cutting action is exerted only on tissue, while the follicle passes through the non-cutting spaces, achieving extraction without excessive or harmful cutting action on the follicle.
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 solution effectively reduces follicle damage by sparing the curled follicle from the cutting edge, enabling successful extraction and transplantation, with the option of manual or machine-controlled operation and ultrasonic assistance for precise tissue penetration.
Implementation Method 1
with or without the aid of an ultrasonic transducer coupled to punch to impart a vibratory cutting force against the tissue
Data Source
AI summary
A punch that is particularly useful for removing curled hair follicles from a donor site comprises a generally tubular body disposed about a generally longitudinal axis between distal and proximal ends, and having a distal cutting end region terminating distally in an opposing pair of distally-extending, generally prong-like members having an anterior notch and a posterior notch therebetween. In one variation, the prong-like members each have a curved anterior cutting edge and a curved posterior edge meeting at a cutting tip. In the preferred embodiment, the posterior notch extends proximally further than the anterior notch and has a generally “V”-shaped distal segment which carries cutting edges together with a generally “U”-shaped proximal segment extending proximally from the distal segment.