Tissue Sample Preparation Device for Biochemical Analysis Version 6 November 1 2002 Team Members Sara Alford Christine Koranda Carla Maas Ryan Roth Client Jeff Ross and Charles Tessier UW Medical School Department of Oncology Advisor Paul Thompson Function The device will grind a frozen tissue sample into a fine powder replacing the manual mortar and pestle grinding technique currently used It will also include a cooling method using liquid nitrogen keep the tissue frozen Client Requirements 1 Sample and tools used must be kept cold at all times during the process 2 Must salvage as much of tissue sample as possible 3 Processing time should not exceed that for manual preparation approximately 15 minutes 4 Device to be used 30 40 sample day 5 Grind tissue to the consistency of powdered sugar 10 m diameter granules 6 No cross sample contamination Design requirement 1 Physical and Operational Characteristics a Performance requirements Tissue should be easily inserted into the device After grinding completions tissue sample should be removed and grinding area cleaned before the next sample Device will be in operation 3 5 hours per day On average the device may have to be turned on 1 3 times per day It should be able to grind a soft tissue sample of a maximum sample size of 8 cm3 2 x 2 x 2 cm The tissue should remain frozen completely through the grinding experiment b Safety Liquid nitrogen should be contained to avoid possible contact with skin and clothing Instrument should be insulated to prevent skin burns Cryogenic gloves and safety glasses may be required for the use of the device Pressure blow valve should be included to avoid possible explosion c Accuracy and Reliability Technique should grind sample to a powdered sugar 10 m diameter granules consistency The device should provide an optimal means of sample collection d Life in Service The device should last 5 10 years with proper handling and maintenance Around 30 40 samples could be analyzed daily e Operating Environment Device would function in a normal room temperature approximately 20 C biochemistry laboratory An alternative to laboratory bench storage may be storing the entire device or certain components in a 20 C or 80 C freezer The interior wall be exposed to extremely cold 196 C temperatures The exterior may be exposed to freezer condition 20 or 80 C The device will be handled by a laboratory technician f Ergonomics The sample should be easily inserted The user s hand should not be subjected to a cold temperature during sample insertion There should be a method for easy refill of the desired coolant dry ice and alcohol g Size The device should fit on a laboratory bench with a maximum volume of 0 9x0 61x0 61 m 3x2x2 ft h Materials Only materials that can withstand cold temperatures can be used fcc metals such as Nickel Aluminum Stainless steel 18 8 Copper Regular glass and plastics should not be used i Cleaning Any components of the device that come in contact with the sample should be removable for ease in cleaning and disinfecting soap and water 2 Production Characteristics a Quantity One prototype will be constructed b Target Product Cost If a pathology lab were to purchase the device a reasonable range would be 5000 20 000 For our client s biochemistry laboratory a reasonable cost for the prototype is 1 000 1 500 3 Miscellaneous a Standards and Specifications Premarket approval by the FDA will be required b Competition i Polytron system a homogenizer that operates at room temperature to grind up sample ii Biospec BeadBeater uses glass or stainless steel balls to break apart sample operates at room temperature iii Biospec Cryogenic Pulverizer uses hammer to crush pre frozen sample in mortar iv Jet Pulverizer use air pressure to pulverize sample