Surgical Fastener Head With Internal Thread For Controlled Deployment
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Solution Overview
Problem
Conventional coil surgical fasteners lack a head structure, leading to increased insertion resistance and the risk of the coil body penetrating through intended tissue or prosthetic materials, with no mechanism to prevent overdriving or tissue contact.
Innovation Solution
A surgical fastener deployment device featuring a head with a through hole and internal thread, combined with a mandrel having a distinct threaded portion, allows for controlled deployment of a distally extending coil body attached to the head, preventing tissue contact and overdriving by applying a distally directed force through rotational engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional coil surgical fastener is used without a head structure, then the device is simpler and can be manufactured more easily, but the insertion resistance increases and the coil body may penetrate through intended tissue or prosthetic materials
Solution Approach 1:
The fastener is divided into two distinct segments: a head portion with external threading and a coil body portion. This segmentation allows the head to provide structural support and control insertion resistance while the coil body performs the fastening function, resolving the contradiction between simplicity and insertion resistance control.
Solution Approach 2:
The head portion acts as an intermediary structure between the deployment device and the coil body. It provides a controlled interface for insertion, reducing the harmful effect of uncontrolled insertion resistance while maintaining the simplicity of the overall fastener design.
2Device complexity
If a conventional coil surgical fastener is used without a head structure, then the device is simpler, but the coil body may penetrate through intended tissue or prosthetic materials due to lack of prevention mechanism
Solution Approach 1:
By segmenting the fastener into a head and coil body, the head serves as a protective barrier that prevents the coil body from penetrating through intended tissue or prosthetic materials, thereby improving reliability without significantly increasing overall device complexity.
Solution Approach 2:
The head portion is designed with external threading that engages with the deployment device, creating a preliminary mechanical constraint that prevents the coil body from over-driving or penetrating beyond the intended target, thus countering the potential harmful action before it occurs.
3Device complexity
If a conventional coil surgical fastener is used without a head structure, then the device is simpler, but there is no mechanism to prevent overdriving
Solution Approach 1:
The segmented design with a dedicated head portion provides a controlled interface for deployment, making the operation more precise and controllable. The head's external threading engages with the deployment device to prevent overdriving, improving ease of operation despite the added structural element.
4Ease of operation
If the pitch of the coil body is greater than the pitch of the threaded portion of the mandrel, then the coil body engages more readily, but the deployment force required increases
Solution Approach 1:
The pitch relationship between the coil body and mandrel threading is carefully optimized. By setting the coil body pitch to be greater than the mandrel threading pitch, the fastener engages more readily during insertion, while the head portion's threading provides the necessary mechanical advantage to reduce the overall deployment force required.
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 reduces insertion resistance, prevents coil body penetration, and provides a surface to abut tissue, ensuring proper deployment and mechanical stability during tissue engagement.
Implementation Method 1
the threaded portion is engaged with the internal thread and the distally extending coil body of the surgical fastener, wherein a pitch of the internal thread of the through hole, and the threaded portion of the mandrel that is engaged with the internal thread, is different from a pitch of the coil body of the surgical fastener
Implementation Method 2
a rotator associated with the surgical fastener, wherein the rotator rotates the surgical fastener relative to the mandrel to displace the surgical fastener in a distal direction
Data Source
Figure 1~3
Figure 4A~6C
Figure 7A~7C
AI summary
A surgical fastener deployment device (2) is disclosed and comprises a handle (4) and a shaft (16) extending distally from the handle. A surgical fastener (18) disposed in the shaft and includes a head (20) having a through hole (24) with an internal thread and a distally extending coil body (22) attached to the head. The device also inclues a mandrel (10) having a threaded portion (12). The threaded portion is engaged with the internal thread and the distally extending coil body of the surgical fastener. A pitch of the threaded portion of the mandrel is different from a pitch of the coil body of the surgical fastener.