Balance Sheets (Unaudited) (USD $)	Jan. 31, 2014	Apr. 30, 2013
Current assets
Cash	$ 847,561	$ 796,023
Accounts receivable, trade (Net of allowance for doubtful accounts of $500 at October 31, 2013 and April 30, 2013)	135,019	173,583
Inventories	135,437	139,424
Prepaid expenses	26,903	42,463
Total current assets	1,144,920	1,151,493
Equipment and leasehold improvements
Equipment	208,618	205,093
Leasehold improvements	20,022	20,022
[PropertyPlantAndEquipmentGross]	228,640	225,115
Less accumulated depreciation and amortization	(218,083)	(212,978)
Total equipment and leasehold improvements, net	10,557	12,137
Other assets
Patents less accumulated amortization	26,689	28,409
Pending patents	177,711	148,912
Deposits	5,937	5,937
Total other assets	210,337	183,258
[Assets]	1,365,814	1,346,888
Current Liabilities
Accounts payable	15,176	17,008
Accrued compensation and payroll taxes	10,916	35,875
Medical device excise tax	436
Other accrued expenses		1,662
Accrued vacation	18,485	22,507
Total current liabilities	45,013	77,052
Deferred income taxes	37,734	37,734
Shareholders equity
Common stock, no par value: 20,000,000 authorized shares issued: 14,935,511 shares outstanding at July 31, 2013 and April 30, 2013	660,988	660,988
Receivable from Affiliate	(19,699)	(19,699)
Retained earnings	641,778	590,813
Total Shareholders Equity	1,283,067	1,232,102
[LiabilitiesAndStockholdersEquity]	$ 1,365,814	$ 1,346,888