A bandage that stimulates and directs blood vessel growth on the surface of a wound has been developed by researchers.
The bandage, called a "microvascular stamp," contains living cells that deliver growth factors to damaged tissues in a defined pattern. After a week, the pattern of the stamp "is written in blood vessels," the researchers report.
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Accident and trauma care is an important public health challenge that requires immediate attention. Injury (trauma) is the leading cause of death for all age groups under the age of 44.
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A paper describing the new approach will appear as the January 2012 cover article of the journal Advanced Materials.
"Any kind of tissue you want to rebuild, including bone, muscle or skin, is highly vascularized," said University of Illinois chemical and biomolecular engineering professor Hyunjoon Kong, a co-principal investigator on the study with electrical and computer engineering professor Rashid Bashir. "But one of the big challenges in recreating vascular networks is how we can control the growth and spacing of new blood vessels."
![Post Traumatic Stress Disorder]( "Post Traumatic Stress Disorder")
Post Traumatic Stress Disorder (PTSD), is a mental condition triggered by a traumatic event. PTSD treatment includes pyschotherapy, behavior therapy and medications.
"The ability to pattern functional blood vessels at this scale in living tissue has not been demonstrated before," Bashir said. "We can now write features in blood vessels."
Other laboratories have embedded growth factors in materials applied to wounds in an effort to direct blood vessel growth. The new approach is the first to incorporate live cells in a stamp. These cells release growth factors in a more sustained, targeted manner than other methods, Kong said.
The stamp is nearly 1 centimeter across and is built of layers of a hydrogel made of polyethylene glycol (an FDA-approved polymer used in laxatives and pharmaceuticals) and methacrylic alginate (an edible, Jell-O-like material).The stamp is porous, allowing small molecules to leak through, and contains channels of various sizes to direct the flow of larger molecules, such as growth factors.
Source: Eurekalert
Post Traumatic Stress Disorder
Post Traumatic Stress Disorder (PTSD), is a mental condition triggered by a traumatic event. PTSD treatment includes pyschotherapy, behavior therapy and medications.
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"The ability to pattern functional blood vessels at this scale in living tissue has not been demonstrated before," Bashir said. "We can now write features in blood vessels."
Other laboratories have embedded growth factors in materials applied to wounds in an effort to direct blood vessel growth. The new approach is the first to incorporate live cells in a stamp. These cells release growth factors in a more sustained, targeted manner than other methods, Kong said.
The stamp is nearly 1 centimeter across and is built of layers of a hydrogel made of polyethylene glycol (an FDA-approved polymer used in laxatives and pharmaceuticals) and methacrylic alginate (an edible, Jell-O-like material).The stamp is porous, allowing small molecules to leak through, and contains channels of various sizes to direct the flow of larger molecules, such as growth factors.
Source: Eurekalert
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The testis can go for a twist inside the sac it is held. This results in loss of blood supply. If left untreated for more than 6 hours the testis loses function.
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