PEG Polymer Composition for Tissue Perfusion and No-Reflow
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Solution Overview
Problem
Existing fluid resuscitation methods, including whole blood, are hindered by the no-reflow phenomenon during ischemia and reperfusion, leading to poor tissue perfusion and oxygen transfer in ischemic tissues.
Innovation Solution
A composition comprising high and low molecular weight polyethylene glycol (PEG) polymers, dissolved in water, is administered to create osmotic gradients that prevent metabolic cell swelling and decompress the microcirculation, allowing efficient capillary perfusion and oxygen transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If whole blood or blood products are used for fluid resuscitation, then oxygen delivery capability is improved, but the no-reflow phenomenon occurs in ischemic tissues leading to poor microcirculatory perfusion
Solution Approach 1:
The PEG solution is administered before blood transfusion to preemptively prevent metabolic cell swelling and decompress the microcirculation. This preliminary action creates optimal conditions for subsequent blood administration, ensuring that the blood can effectively perfuse the microcirculation without encountering the no-reflow phenomenon.
Solution Approach 2:
The PEG solution acts as an intermediary substance that modifies the microcirculatory environment. By creating osmotic gradients and preventing cell swelling, it mediates between the administered blood and the ischemic tissue, facilitating improved oxygen delivery while preventing the harmful no-reflow effect.
2Quantity of substance
If larger volumes of blood are administered for transfusion, then oxygen supply to tissues is improved, but the no-reflow phenomenon worsens due to increased metabolic cell swelling
Solution Approach 1:
The PEG solution applies a preliminary counter-action to prevent metabolic cell swelling before it can be exacerbated by blood transfusion. By establishing osmotic gradients that inhibit water influx into cells, it counteracts the swelling tendency that would otherwise worsen with increased blood volume administration.
Solution Approach 2:
The PEG solution changes the osmotic parameters of the extracellular environment. By increasing extracellular osmolality, it alters the water distribution equilibrium, preventing intracellular swelling that would otherwise occur with blood transfusion and compromising microcirculatory flow.
3Quantity of substance
If conventional IV solutions like lactated ringers are used for resuscitation, then fluid replacement is achieved, but oxygen transfer to ischemic tissues remains severely limited
Solution Approach 1:
The invention combines PEG polymers with isotonic saline or lactated ringers solution to create a composite resuscitation fluid. This composite formulation integrates the fluid replacement capabilities of conventional solutions with the microcirculatory decompressing and anti-swelling properties of PEG, achieving both adequate fluid volume replacement and improved oxygen transfer to ischemic tissues.
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 PEG polymers enhance capillary perfusion, reduce the need for blood volume in transfusions, and improve patient survival by ensuring oxygen delivery to ischemic tissues, even in low volume states.
Implementation Method 1
A composition comprising high and low molecular weight polyethylene glycol (PEG) polymers, dissolved in water, is administered to create osmotic gradients that prevent metabolic cell swelling and decompress the microcirculation
Data Source
AI summary
A composition for restoring or increasing tissue perfusion is provided. The composition includes polyethylene glycol polymers (PEG) with a molecular weight of 18,000-100,000 Da at a concentration of 5-20% by weight; PEG with a molecular weight of 1,000-10,000 Da at a concentration of 1-30% by weight; and water, wherein said PEG with a molecular weight of 18,000-100,000 Da and said PEG with a molecular weight of 1,000-10,000 Da are dissolved or dispersed in said water.