Navigation Links
Biochip-based device for cell analysis
Date:5/30/2012

Inexpensive, portable devices that can rapidly screen cells for leukemia or HIV may soon be possible thanks to a chip that can produce three-dimensional focusing of a stream of cells, according to researchers.

"HIV is diagnosed based on counting CD4 cells," said Tony Jun Huang, associate professor of engineering science and mechanics, Penn State. "Ninety percent of the diagnoses are done using flow cytometry."

Huang and his colleagues designed a mass-producible device that can focus particles or cells in a single stream and performs three different optical assessments for each cell. They believe the device represents a major step toward low-cost flow cytometry chips for clinical diagnosis in hospitals, clinics and in the field.

"The full potential of flow cytometry as a clinical diagnostic tool has yet to be realized and is still in a process of continuous and rapid development," the team said in a recent issue of Biomicrofluidics. "Its current high cost, bulky size, mechanical complexity and need for highly trained personnel have limited the utility of this technique."

Flow cytometry typically looks at cells in three ways using optical sensors. Flow cytometers use a tightly focused laser light to illuminate focused cells and to produce three optical signals from each cell. These signals are fluorescence from antibodies bound to cells, which reveals the biochemical characteristics of cells; forward scattering, which provides the cell size and its refractive index; and side scattering, which provides cellular granularity. Processing these signals allows diagnosticians to identify individual cells in a mixed cell population, identify fluorescent markers and count cells and other analysis to diagnose and track the progression of HIV, cancer and other diseases.

"Current machines are very expensive costing $100,000," said Huang. "Using our innovations, we can develop a small one that could cost about $1,000."

One reason the current machines are so large and expensive is the method used to channel cells into single file and the necessary alignment of lasers and multiple sensors with the single-file cell stream. Currently, cells are guided into single file using a delicate three-dimensional flow cell that is difficult to manufacture. More problematic is that these current machines need multiple lenses and mirrors for optical alignment.

"Our approach needs only a simple one-layer, two-dimensional flow cell and no optical alignment is required," said Huang.

Huang and his team used a proprietary technology named microfluidic drifting to create a focused stream of particles. Using a curved microchannel, the researchers took advantage of the same forces that try to move passengers in a car to the outside of a curve when driving. The microfluidic chip's channel begins as a main channel that contains the flow of carrier liquid and a second channel that comes in perpendicularly that carries the particles or cells. Immediately after these two channels join, the channel curves 90 degrees, which moves all the cells into a horizontal line. After the curve, liquid comes into the channel on both sides, forcing the horizontal line of cells into single file. The cells then pass through a microlaser beam.

An advantage of this microfluidic flow cytometry chip is that it can be mass-produced by molding and standard lithographic processes. The fibers for the optical-fiber delivered laser beams and optical signals already exist.

"The optical fibers are automatically aligned once inserted into the chip, therefore requiring no bulky lenses and mirrors for optical alignment," said Huang. "Our machine is small enough it can be operated by battery, which makes it usable in Africa and other remote locations."

The researchers tested the device using commercially available, cell-sized fluorescent beads. They are now testing the device with actual cells.

Working with Huang were Xiaole Mao, graduate student in bioengineering; Ahmad Ahsan Nawaz, Xz-Chin Steven Lin, Michael Ian Lapsley, Yanhui Zhao, graduate students in engineering science and mechanics, and Wafik S. el-Deiry, professor of medicine, Rose Dunlap Division Chair in Hematology/Oncology and associate director for translational research, Cancer Institute, all at Penn State, and J. Philip McCoy, National Heart, Lung, and Blood Institute at the National Institutes of Health.


'/>"/>

Contact: A'ndrea Elyse Messer
aem1@psu.edu
814-865-9481
Penn State
Source:Eurekalert  

Related medicine news :

1. Embedded Mobile & M2M Device revenues to Rise to Almost $19 Billion Globally by 2014, Says Juniper Research
2. Scott & White Memorial Hospital uses device to revolutionize treatment of traumatic aortic injury
3. Clinical trial underway: Miniature ultrasound device could revolutionize pain relief
4. Device Helps Kids With Single-Sided Deafness
5. Apex Heart Care, First Arizona Clinic to Install Shape-HF; New Medical Device Measures Patient Physiology to Define Shortness of Breath
6. Innovative Medical Alert Device Sets a New Standard in PERS Industry
7. Aurora BayCare Hosts Statewide Medical Device Business Development Meeting
8. EPIC study finds new embolic protection device had 97.5 percent success rate during carotid artery stenting
9. Santa Rosa Consulting Announces New Free Education Series: Hot Topics in Patient Care Device Integration
10. SDI Reports: Nearly a Third Of Physicians Use Handheld and Smartphone Devices to Access Medical Information - Physicians Most Likely to be Using Apple iPhone
11. Power Plate Unveils the First Cable-Based Upper-Body Vibration Training Device
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Biochip-based device for cell analysis
(Date:3/24/2017)... ... March 24, 2017 , ... Gastro Health ... to prep patients for colonoscopy at the HyGIeaCare® Center that is to be ... FL. , The HyGIeaCare® Prep, cleared by the U.S. Food and ...
(Date:3/24/2017)... , ... March 24, 2017 , ... ... first Certified Medical Reiki™ Master in Frederick, MD. Judy says, “I am passionate ... during what is often a very difficult and challenging time.” , A Certified ...
(Date:3/24/2017)... ... ... Time GPS”: a dauntless and enlightened study of the second-coming of Christ, and ... published author, Wesley Gerboth, a World War II veteran, with a highly-regarded reputation as ... ninety-one, he shares the Wisdom God bestowed upon him in this publication. , ...
(Date:3/24/2017)... , ... March 24, 2017 , ... ... of inspiring stories about real people of God in congregations across the United ... Miller, a Presbyterian minister ordained in 1964 who has served congregations in seven ...
(Date:3/23/2017)... Greensboro, NC & Seattle, WA (PRWEB) , ... March 23, 2017 ... ... international public health emergency and now estimates that there could be four million Zika-related ... fastest growing epidemics to date with numbers of US cases reported per year skyrocketing ...
Breaking Medicine News(10 mins):
(Date:3/24/2017)... Mar. 24, 2017 Research and Markets ... the U.S.: Consumer Strategies" report to their offering. ... Pain ... approach and treat their physical pain, emphasizing consumer survey analysis, ... pain sufferers and adults who have selected illnesses/conditions strongly associated ...
(Date:3/24/2017)... March 24, 2017 ShangPharma, a ... and cost-effective drug development and discovery services, ... biotechnology industry, announced today the intent for ... will be consolidating the Contract Research Organizations ... Shanghai ChemPartner. These entities include ChemPartner Shanghai, ...
(Date:3/24/2017)... Research and Markets has announced the addition of the ... offering. ... is very strong with a total of 97 drug candidates. Pharma giant ... are involved in the development of the IPF therapeutics. The IPF pipeline ... stage, 15 are in Phase II stage, 12 are in Phase I ...
Breaking Medicine Technology: