Biodegradable Microfiber Anchoring for Implantable Medical Devices
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Solution Overview
Problem
Medical devices implanted into soft tissue, such as microelectrodes and optical microfibers, face challenges with positional stabilization immediately after implantation, leading to tissue irritation and delayed integration due to inadequate anchoring, which is exacerbated by tissue movements like respiration and muscle activity.
Innovation Solution
The use of biocompatible, degradable microfibers attached to the device surface, which degrade over a period corresponding to the integration time, providing temporary stabilization through increased surface area and irregularity for better tissue adherence, eventually reducing the need for permanent anchoring and facilitating device removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If means for long-term anchoring such as protrusions or openings for tissue ingrowth are used, then long-term positional stabilization is achieved, but immediate positional stabilization upon implantation is insufficient
Solution Approach 1:
The patent applies preliminary action by providing a temporary anchoring means (degradable matrix) that immediately stabilizes the device upon implantation before the long-term anchoring mechanisms (protrusions, tissue ingrowth openings) become effective. This temporary matrix is deployed in advance to prevent device movement during the critical initial period when tissue integration has not yet occurred.
Solution Approach 2:
The degradable matrix serves as an intermediary between the device and the surrounding tissue, providing immediate mechanical support and stabilization. This intermediary component bridges the gap during the transition period before permanent tissue anchoring establishes, allowing the device to remain stationary while tissue integration progresses.
2Stability of the object's composition
If permanent anchoring means are used to stabilize the device, then positional stability is improved, but device removal becomes difficult and may cause tissue damage
Solution Approach 1:
The patent applies parameter changes by using a degradable matrix whose mechanical properties change over time. The matrix provides strong anchoring initially but gradually degrades through hydrolysis or enzymatic breakdown, transforming from a permanent anchor to a temporary support structure. This time-dependent parameter change allows easy device removal after the intended treatment period without causing tissue damage.
Solution Approach 2:
The degradable matrix functions as a temporary, disposable anchoring means that serves its purpose during the treatment period and then naturally breaks down. This short-living anchoring component replaces permanent fixation structures, allowing the device to be removed easily after use without requiring surgical intervention for anchor removal.
3Ease of operation
If the device surface is smooth and simple in shape, then implantation is easier, but tissue adherence and positional stabilization are insufficient
Solution Approach 1:
The patent employs a thin film degradable matrix that envelops the device surface, providing increased surface area for tissue adherence without complicating the underlying device structure. This thin film layer maintains implantation ease while enabling strong tissue integration through its degraded breakdown products that promote cellular attachment and growth.
Solution Approach 2:
The degradable matrix is structured with porosity that increases surface area and facilitates tissue infiltration and adherence. The porous structure allows tissue cells to penetrate and attach to the matrix, strengthening positional stabilization while the overall device shape remains simple for easy implantation.
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
This approach enhances initial positional stabilization, reduces tissue irritation, and allows for gradual integration, ultimately decreasing the force needed for stabilization, making device removal less damaging and more efficient.
Implementation Method 1
A useful means for positionally stabilizing a proto-device for implantation of soft tissue according to the invention are biocompatible microfibres attached to the surface of the device and capable of being degraded upon implantation by contact with aqueous body fluid
Implementation Method 2
Microfibres for use in the invention are preferably degradable by hydrolysis, in particular by enzymatically enhanced hydrolysis
Implementation Method 3
capable of being degraded and resorbed over a period at least corresponding to the period of time required for positional stabilization of the device by integration into the tissue
Data Source
Figure 1a~3
Figure 4a~5a
Figure 6a~6c
AI summary
A proto-device for implantation into soft tissue comprises an oblong device body, biodegradable microfibres adhesively attached to the body, a rigid matrix of biocompatible material enclosing the body and the microfibres. The biocompatible material is dissolvable and/or degradable in aqueous body fluid at a rate substantially superior to the rate of microfibre degradation. The proto-device is one of proto-microelectrode, proto-optical fibre, proto-polymer tube for drug delivery, proto-electrical lead, proto-encapsulated electronics. Also disclosed are uses of the proto-device and methods for its implantation and manufacture.