Needle Coating Agent Composite for Friction and Peeling
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Solution Overview
Problem
Existing injection needle coatings, despite using silicones for lubrication, still cause pain and discomfort due to friction and potential peeling issues, which affect durability and piercing characteristics.
Innovation Solution
A coating agent comprising an alkoxysilane with —NR— and hydroxyl groups, combined with polydiorganosiloxane and an amino-group-containing polyorganosiloxane, forming a condensate that enhances adhesion and crosslinking, thereby improving durability and lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a silicone coating agent is applied to the injection needle surface to reduce friction, then piercing characteristics are improved, but the coating may peel off during repeated use, reducing durability
Solution Approach 1:
The patent uses a composite coating system consisting of multiple silicone compounds with different functions. The base coating includes polydiorganosiloxane for lubrication, while additional components like amino-group-containing polyorganosiloxane and condensates provide adhesion and crosslinking. This multi-component composite structure allows the coating to maintain both low friction for piercing and strong bonding for durability during repeated needle insertions and reuses
Solution Approach 2:
The patent optimizes the molecular weight, composition ratio, and chemical structure parameters of the silicone compounds to achieve the desired balance. Specifically, controlling the molecular weight of polydiorganosiloxane within certain ranges and adjusting the ratio of different silicone components allows tuning of both the lubricating properties for piercing and the crosslinking density for durability, resolving the contradiction between ease of operation and reliability
2Object-affected harmful factors
If the coating agent is applied to reduce friction for patient comfort, then piercing characteristics are enhanced, but the coating may exfoliate from the needle surface, increasing friction during use
Solution Approach 1:
The patent incorporates adhesion promoters and crosslinking agents in the coating formulation before application to the needle surface. These preliminary chemical modifications create strong bonding between the coating and needle substrate, preventing exfoliation during subsequent use. The crosslinking structure is formed in advance through chemical reactions between coating components and needle surface groups, ensuring coating integrity is established before the needle encounters patient tissue
Solution Approach 2:
The patent adjusts chemical parameters such as the density of amino groups, molecular weight distribution, and crosslinking degree to optimize both patient comfort and coating stability. By controlling these parameters within specific ranges, the coating maintains low friction for patient comfort while simultaneously achieving sufficient adhesion strength to prevent exfoliation, thus resolving the contradiction between reducing harmful factors and maintaining composition stability
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 coating agent significantly reduces friction and enhances piercing characteristics, maintaining lubrication and preventing peeling, thus alleviating patient discomfort and ensuring the coating's durability even with repeated use.
Implementation Method 1
a coating agent that contains an alkoxysilane having at least —NR— (where R is each independently a hydrogen atom or a monovalent hydrocarbon group) and a hydroxyl group, in addition to a polydiorganosiloxane and an amino-group-containing polyorganosiloxane
Implementation Method 2
The silicone coating agents impart a lubricating property to the injection needle, thereby reducing friction at the time of puncture
Data Source
AI summary
A coating agent that has excellent durability and a medical instrument (for example, a needle) that has been coated with the coating agent, are provided. The coating agent includes a condensate (1) of a compound represented by the following general formula (1-1) with a compound represented by the following general formula (1-2),a polydiorganosiloxane (2), and an amino-group-containing polyorganosiloxane (3). The content ratio of the polydiorganosiloxane (2) is 30 to 75 mass %, based on the total mass of the condensate (1), the polydiorganosiloxane (2), and the amino-group-containing polyorganosiloxane (3).