Gelatin-Coated Microelectrode Cooling for Tissue Insertion
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Solution Overview
Problem
The insertion of microelectrodes and other devices into soft tissues, such as nervous or endocrinous tissue, often causes damage due to friction, and existing friction-reducing materials designed to dissolve in body fluids can dissolve prematurely, leading to tissue damage.
Innovation Solution
A microelectrode coated with a gel-forming biocompatible agent like gelatin, whose dissolution is delayed by lowering the temperature at the contact site, combined with a cooling mechanism to maintain the device at a temperature significantly below body temperature during insertion, thereby reducing tissue damage and controlling the dissolution of the gelatin layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a friction-reducing material coat is provided on the microelectrode to minimize tissue damage during insertion, then tissue damage is reduced, but the material may dissolve prematurely during insertion causing loss of protective function
Solution Approach 1:
The patent changes the temperature parameter of the gelatin coat from body temperature to lower temperature (e.g., refrigerated or frozen state) to control its dissolution rate. This parameter change allows the gelatin to maintain its protective friction-reducing properties during insertion while delaying dissolution until after the device is properly positioned in the tissue.
Solution Approach 2:
The gelatin coat is applied to the microelectrode in advance during manufacturing, forming a protective layer before insertion. This preliminary action ensures the friction-reducing material is already in place to protect tissue during the insertion process, eliminating the need for separate application steps.
2Object-affected harmful factors
If the microelectrode diameter is reduced to minimize tissue damage, then tissue damage is reduced, but insertion difficulty and precision control become more challenging
Solution Approach 1:
The gelatin coat acts as a flexible protective shell around the microelectrode. This thin film layer reduces friction during insertion, making it easier to control the insertion of ultra-thin electrodes (e.g., 1-10 micrometers in diameter) without increasing tissue damage. The flexible nature of the gelatin allows it to conform to the small diameter while providing sufficient protective coverage.
3Reliability
If a permanent electrically insulating material is used to cover the electrode body, then electrical insulation is improved, but friction reduction and tissue compatibility are compromised
Solution Approach 1:
The patent uses a composite coating structure combining gelatin (for friction reduction and biocompatibility) with an underlying permanent electrically insulating material (such as Parylene or silicone). This composite approach allows the device to benefit from both the low-friction, tissue-compatible properties of gelatin during insertion and the reliable electrical insulation of the permanent material once implanted.
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 method effectively delays the dissolution of the gelatin layer, reducing tissue damage and allowing for precise placement of the microelectrode by maintaining the device at a lower temperature, which also applies to other devices like temperature sensors and optical fibers.
Implementation Method 1
Gel forming biocompatible agents are useful in the implantation of medical devices such as microelectrodes into soft tissue such as nervous or endocrine tissue. The gel forming agents are applied in form of single or multiple layers on the devices forming coats swelling in contact with aqueous body fluid and then dissolving in the fluid
Implementation Method 2
dissolution of gels formed by contact of gel forming biocompatible agents, in particular gelatin, with aqueous body fluids in a warm-blooded person or animal can be delayed by lowering the temperature at the contact site
Implementation Method 3
lowering the temperature of soft tissue in contact with a medical device being inserted into it protects the tissue from damage. According to the invention the temperature of the tissue contacted by a device being inserted to it is cooled by the device, which has a temperature substantially below tissue temperature
Data Source
AI summary
A device selected from microelectrode, temperature sensor, optical sensor, optical fibre, temperature control element, and microdialysis probe for insertion into soft tissue comprises a body with a distal terminal section and a layer of an agent such as gelatin capable of forming a gel with aqueous body fluid on the terminal section. The terminal section and the gel-forming layer have a temperature of more than 30° C. below body temperature during a period of time prior and up to insertion. Also disclosed is method of insertion, an insertion assembly and a use of the device.