Haemostatic Bracelet with Dynamic Hinge for Adjustable Compression
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Solution Overview
Problem
Existing haemostatic devices for stopping bleeding after AVF disconnection, such as haemostatic dressings and clamps, are either expensive or difficult to apply and adjust to the patient's arm diameter, and may displace during use, while current bracelets are cumbersome and costly for single use.
Innovation Solution
A haemostatic bracelet with a clamp and arch structure that allows for adjustable compression, featuring articulations and retaining pins for secure fitting, enabling easy placement and adaptation to different arm diameters without displacement, and manufactured for single use at low cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple adjustable bracelet similar to a tourniquet is used, then the cost is low and it can be manufactured simply, but the bracelet displaces during tightening and is difficult to apply
Solution Approach 1:
The bracelet employs a dynamic hinge mechanism that allows the compression element to move relative to the bracelet body during application. The hinge enables the compression element to approach the puncture site dynamically as the bracelet is tightened, ensuring accurate positioning without displacement and simplifying the application process while maintaining low manufacturing complexity
Solution Approach 2:
The bracelet is divided into distinct functional segments: the bracelet body, the hinge mechanism, and the compression element. This segmentation allows each component to perform its specific function independently - the bracelet provides structure, the hinge enables controlled movement, and the compression element delivers pressure - thereby resolving the contradiction between simple manufacture and ease of operation
2Reliability
If a haemostatic clamp with a return spring is used, then the device is reusable and can be cleaned and sterilised, but the pressure exerted depends on the patient's corpulence rather than medical needs
Solution Approach 1:
The bracelet incorporates a compression element that automatically adjusts its position and applies pressure directly to the puncture site through the hinge mechanism. The system self-adjusts to deliver consistent therapeutic pressure independent of arm diameter, eliminating the need for manual calibration based on patient corpulence while maintaining reusability through proper cleaning and sterilisation protocols
Solution Approach 2:
The design changes the pressure application mechanism from a spring-based system where pressure varies with arm diameter to a direct compression system where the compression element maintains consistent pressure on the puncture site regardless of the patient's corpulence, thereby improving adaptability while preserving reusability
3Reliability
If finger compression is applied for 10 minutes, then haemostasis is achieved for dialysis patients, but the patient must be physically capable of maintaining compression
Solution Approach 1:
The bracelet is designed to be applied by medical personnel and then maintains compression automatically without requiring the patient to exert physical effort. The device serves itself by maintaining the necessary pressure on the puncture site throughout the 10-minute haemostasis period, making it accessible to all patients regardless of their physical capability
Solution Approach 2:
The bracelet acts as an intermediary device between the medical personnel who apply it and the puncture site that requires compression. Once applied, it mediates the compression function independently, freeing the patient from the requirement to maintain manual pressure while ensuring reliable haemostasis
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 bracelet provides consistent and effective pressure on the puncture site, easy application, and adaptability to various arm diameters, ensuring reliable haemostasis without the need for complex configurations or high costs, facilitating single-use, cost-effective haemostasis.
Implementation Method 1
each branch of the arch is provided with a first articulation, the first articulations being situated facing each other and forming a first set of articulations
Implementation Method 2
The part of the arch situated between the two articulations of the first set of articulations and comprising the second strut can be folded in the direction of the clamp by pivoting about the first articulations
Implementation Method 3
a compression element placed, when the bracelet is ready for use, inside the space defined by the branches and the first strut of the clamp
Implementation Method 4
actuation elements fixed to the branches of the clamp so that the ends of the branches of the clamp opposite to the first strut can be spread by moving the ends of the actuation elements towards each other
Data Source
AI summary
The invention relates to a haemostatic bracelet (1) comprising: —a clamp comprising two branches (11, 12) and a first strut (13), each branch (11, 12) being connected by one of its ends to the other branch by means of the first strut (13), —a compression element (24) placed, when the bracelet is ready for use, inside the space defined by the branches (11, 12) and the first strut (13) of the clamp or inside a projection of this space, the compression element (24) protruding in the direction of the opening between the ends of the branches (11, 12) of the clamp opposite to the first strut (13), —actuation elements (30, 40) fixed to the branches (11, 12) of the clamp so that the ends of the branches (11, 12) of the clamp opposite to the first strut (13) can be spread by moving the ends of the actuation elements towards each other.