Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended		533 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net Loss	$ (5,798,992)	$ (5,054,236)	$ (97,714,866)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	118,864	190,738	1,982,995
Amortization of deferred compensation	0	0	336,750
Interest on debt instruments	1,295,541	0	33,214,178
Loss (gain) on debt settlement and extinguishment	0	6,588	163,097
Loss on impairment, disposal and write down of long-lived assets	2,671	0	670,326
Issuance and vesting of compensatory stock options and warrants	50,905	92,124	8,276,193
Issuance of common stock below market value	0	0	695,248
Issuance of common stock as compensation	51,338	53,250	606,339
Issuance of common stock for services rendered	0	0	1,265,279
Issuance of note payable for services rendered	0	0	120,000
Contributions of capital through services rendered by stockholders	0	0	216,851
Changes in operating assets and liabilities
Accounts receivable, prepaid expenses and other assets	(171,416)	153,977	(890,193)
Inventory	(19,629)	52,364	218,397
Accounts payable and accrued liabilities	(112,736)	115,399	2,233,766
Net cash used in operating activities	(4,583,454)	(4,389,796)	(48,605,640)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment	(8,869)	(138,798)	(1,752,960)
Capitalization of patent costs and license rights	(152,606)	(118,504)	(1,666,945)
Net cash used in investing activities	(161,475)	(257,302)	(3,419,905)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from sale of common stock and exercise of stock options and warrants, net of related expenses and payments	619,180	4,901,400	36,363,844
Repurchase of outstanding warrants	0	0	(2,836,520)
Proceeds from stockholder notes payable	0	0	977,692
Proceeds from issuance of notes payable, net of issuance costs	700,000	0	7,380,829
Proceeds from convertible notes, net of issuance costs	4,514,162	0	13,321,447
Payments on notes - short-term	(36,100)	(49,841)	(1,177,490)
Net cash provided by financing activities	5,797,242	4,851,559	54,029,802
Net change in cash and cash equivalents	1,052,313	204,461	2,004,257
Cash and cash equivalents, beginning of period	951,944	632,706
Cash and cash equivalents, end of period	2,004,257	837,167	2,004,257
Cash paid for:
Interest	12,025	863	262,631
Income taxes	$ 0	$ 0	$ 27,528