Bone Punch Lever-Sheath Mechanism for Easier Extraction
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Solution Overview
Problem
Existing medical devices face challenges in efficiently forming holes in bones due to cortical elasticity, making it difficult to insert and remove anchor members or staples, particularly in areas like the glenohumeral joint.
Innovation Solution
A medical device with a handle assembly and a bone punch featuring a lever and sheath mechanism that allows for controlled insertion and extraction of a piercing tip into bone, utilizing a linkage or gear system to manage the depth and ease of removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional bone hole formation method is used, then the anchor member can be inserted into the bone, but the removal of the tool is difficult due to cortical elasticity
Solution Approach 1:
The bone punch incorporates a flexible or articulating shaft that can dynamically adjust its configuration. The shaft transitions from a constrained state during insertion to an expanded or articulated state during removal, allowing the tool to overcome cortical elasticity and be easily extracted from the bone hole.
Solution Approach 2:
The bone punch is divided into segmented components including a handle assembly, shaft sections, and a piercing tip. These segments can move relative to each other, with the shaft comprising multiple articulating sections that enable flexible manipulation and easy removal from the bone after anchor insertion.
2Manufacturing precision
If a bone punch with piercing tip is used to form holes in bone, then hole formation is achieved, but controlled depth and force application is challenging
Solution Approach 1:
The bone punch uses a dynamically controllable shaft that can be manipulated to achieve precise depth control. The flexible or articulating shaft allows the operator to control the insertion depth and force application through manual manipulation, achieving precise hole formation without complex mechanical depth-limiting mechanisms.
3Ease of operation
If anchor members are inserted into bone holes, then tendon repair is achieved, but the insertion and extraction process requires excessive force
Solution Approach 1:
The bone punch employs a flexible or articulating shaft that can dynamically adjust during the anchor insertion and extraction process. During insertion, the shaft transmits force efficiently to place the anchor. During extraction, the shaft can articulate or expand to reduce friction and overcome resistance, significantly reducing the force required to remove the tool.
Solution Approach 2:
The device is segmented into a handle assembly, flexible shaft with multiple sections, and piercing tip. This segmentation allows each component to optimize its function - the handle provides leverage, the articulated shaft sections reduce friction and enable easy extraction, and the piercing tip delivers precise anchor placement with minimal insertion force.
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
Facilitates efficient and controlled hole formation in bones, reducing the force required for insertion and extraction of anchor members, and providing a visual cue for depth indication during the procedure.
Implementation Method 1
the handle assembly includes a spring biasing the lever toward the initial position
Data Source
AI summary
A medical device configured to form one or more holes within a bone of a patient may include a handle assembly including a housing, a lever rotatably coupled to the housing, and a sheath extending distally from the housing, the handle assembly including a spring biasing the lever toward an initial or intermediate position; and a bone punch including an elongate shaft, a head at a proximal end of the elongate shaft, and a piercing tip at a distal end of the elongate shaft configured to be driven into the bone. The elongate shaft may be slidably disposed within the sheath in a first position when the lever is in the initial or intermediate position. Translation of the bone punch distally within the sheath from the first position to a second position may cause a distal end of the lever to rotate away from the housing to an extended position.