Cadaver Stem Cell Harvesting for Regenerative Medicine
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Solution Overview
Problem
Current methods for obtaining stem cells from adult tissues are technically difficult and costly due to the rarity and low quantity of stem cells, contamination with non-stem cells, and ethical concerns surrounding embryonic stem cells, while there is a need for a readily available source of stem cells for regenerative medicine and therapies.
Innovation Solution
A method for obtaining stem cells from mammalian cadavers by harvesting tissues from cadavers stored at 1-6°C, extracting mononuclear cells, and culturing them under specific conditions to maintain viability and purity, which allows for the isolation of human skeletal muscle stem cells and hematopoietic stem cells that can survive for extended periods post-mortem and remain functional for transplantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If stem cells are extracted from adult tissues using current methods, then stem cells can be obtained, but the process is technically difficult and costly due to rarity and low quantity of stem cells
Solution Approach 1:
The patent applies preliminary action by harvesting tissues from cadavers before the complete degradation of stem cells occurs. By performing the harvesting operation within a specific time window after death (before 24-48 hours), the method captures stem cells in a viable state, thereby solving the problem of low quantity and technical difficulty associated with extracting stem cells from living adult tissues where stem cells are rare and difficult to isolate.
Solution Approach 2:
The patent uses an intermediary approach by introducing cadaver tissue as an intermediate source between embryonic stem cells and adult tissue stem cells. This intermediary source provides abundant stem cells that are easier to harvest than adult tissues but ethically acceptable alternatives to embryonic stem cells, thereby resolving the contradiction between quantity availability and ease of manufacture.
2Reliability
If stem cells are extracted from adult tissues, then stem cells can be obtained, but contamination with non-stem cells occurs
Solution Approach 1:
The patent applies the extraction principle by specifically isolating and taking out stem cells from cadaver tissues through targeted harvesting methods. By focusing on specific tissue types known to contain high concentrations of stem cells (such as adipose tissue, bone marrow, and muscle) and using appropriate separation techniques, the method achieves high purity stem cell isolation without the contamination problems associated with extracting stem cells from heterogeneous adult tissue samples.
3Adaptability or versatility
If embryonic stem cells are procured from embryos or foetal tissue, then stem cells with greatest differentiation potential are obtained, but religious and ethical issues arise
Solution Approach 1:
The patent applies inversion by reversing the traditional timeline of stem cell harvesting. Instead of harvesting stem cells from embryos (before birth) or fetuses (during pregnancy), the method harvests stem cells from cadavers (after death). This inversion maintains the high differentiation potential of embryonic-like stem cells while eliminating the ethical and religious controversies associated with destroying embryos or fetuses, as the donor has already passed away and consent can be obtained from next of kin.
4Quantity of substance
If stem cells are obtained from cadavers, then a readily available source is provided, but stem cell viability decreases over time after death
Solution Approach 1:
The patent applies preliminary action by establishing protocols for harvesting cadaver tissues within optimal time windows after death. By performing the harvesting operation before 24-48 hours post-mortem (depending on storage conditions), the method ensures stem cells are collected while still viable, thereby resolving the contradiction between making stem cells readily available from cadavers and maintaining their viability over time.
Solution Approach 2:
The patent applies parameter changes by optimizing storage conditions (temperature, humidity, atmosphere) and harvesting time parameters to maximize stem cell viability in cadaver tissues. By controlling these parameters, the method extends the viable window for stem cell extraction from cadavers, thereby increasing availability without sacrificing viability.
Data Source
AI summary
The present invention relates to methods for obtaining stem cells from mammalian cadavers, methods for obtaining or purifying stem cells from a sample likely to contain non-stem cells, methods of regeneration of injured tissues and methods of treatment.