	UNITED STATES
	SECURITIES AND EXCHANGE COMMISSION
	Washington, D.C. 20549

	SCHEDULE 13G

Information Statement Pursuant to Rules 13d-1 and 13d-2

Under the Securities Exchange Act of 1934
(Amendment No. )*

Cyberonics, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

23251P102

(CUSIP Number)

October 7, 2004

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

o	Rule 13d-1(b)
ý	Rule 13d-1(c)
o	Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Page 1 of 16

Cusip No. 23251P102

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Page 2 of 16 Pages

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Citadel Limited Partnership

	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		ý
		(b)		o

	3.	SEC Use Only

	4.	Citizenship or Place of Organization Illinois limited partnership U.S.A.

Number of Shares Beneficially Owned by Each Reporting Person With			5.		Sole Voting Power 0

			6.		Shared Voting Power 936,468 shares of Common Stock 2,854 call options (exercisable into 285,400 shares of Common Stock)

			7.		Sole Dispositive Power 0

			8.		Shared Dispositive Power See Row 6 above.

	9.	Aggregate Amount Beneficially Owned by Each Reporting Person See Row 6 above.

	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

	11.	Percent of Class Represented by Amount in Row (9) Approximately 5.1% as of the date of this filing (based on 23,842,808 shares of Common Stock issued and outstanding as of August 27, 2004).

	12.	Type of Reporting Person (See Instructions) PN; HC

Page 2 of 16

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Page 3 of 16 Pages

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) GLB Partners, L.P.

	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		ý
		(b)		o

	3.	SEC Use Only

	4.	Citizenship or Place of Organization Delaware limited partnership U.S.A.

Number of Shares Beneficially Owned by Each Reporting Person With			5.		Sole Voting Power 0

			6.		Shared Voting Power 936,468 shares of Common Stock 2,854 call options (exercisable into 285,400 shares of Common Stock)

			7.		Sole Dispositive Power 0

			8.		Shared Dispositive Power See Row 6 above.

	9.	Aggregate Amount Beneficially Owned by Each Reporting Person See Row 6 above.

	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

	11.	Percent of Class Represented by Amount in Row (9) Approximately 5.1% as of the date of this filing (based on 23,842,808 shares of Common Stock issued and outstanding as of August 27, 2004).

	12.	Type of Reporting Person (See Instructions) PN; HC

Page 3 of 16

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Page 4 of 16 Pages

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Citadel Investment Group, L.L.C.

	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		ý
		(b)		o

	3.	SEC Use Only

	4.	Citizenship or Place of Organization Delaware limited liability company U.S.A.

Number of Shares Beneficially Owned by Each Reporting Person With			5.		Sole Voting Power 0

			6.		Shared Voting Power 936,468 shares of Common Stock 2,854 call options (exercisable into 285,400 shares of Common Stock)

			7.		Sole Dispositive Power 0

			8.		Shared Dispositive Power See Row 6 above.

	9.	Aggregate Amount Beneficially Owned by Each Reporting Person See Row 6 above.

	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

	11.	Percent of Class Represented by Amount in Row (9) Approximately 5.1% as of the date of this filing (based on 23,842,808 shares of Common Stock issued and outstanding as of August 27, 2004).

	12.	Type of Reporting Person (See Instructions) OO; HC

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Page 5 of 16 Pages

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Kenneth Griffin

	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		ý
		(b)		o

	3.	SEC Use Only

	4.	Citizenship or Place of Organization U.S. Citizen U.S.A.

Number of Shares Beneficially Owned by Each Reporting Person With			5.		Sole Voting Power 0

			6.		Shared Voting Power 936,468 shares of Common Stock 2,854 call options (exercisable into 285,400 shares of Common Stock)

			7.		Sole Dispositive Power 0

			8.		Shared Dispositive Power See Row 6 above.

	9.	Aggregate Amount Beneficially Owned by Each Reporting Person See Row 6 above.

	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

	11.	Percent of Class Represented by Amount in Row (9) Approximately 5.1% as of the date of this filing (based on 23,842,808 shares of Common Stock issued and outstanding as of August 27, 2004).

	12.	Type of Reporting Person (See Instructions) IN; HC

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Page 6 of 16 Pages

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Citadel Wellington Partners L.P.

	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		ý
		(b)		o

	3.	SEC Use Only

	4.	Citizenship or Place of Organization Illinois limited partnership U.S.A.

Number of Shares Beneficially Owned by Each Reporting Person With			5.		Sole Voting Power 0

			6.		Shared Voting Power 936,468 shares of Common Stock 2,854 call options (exercisable into 285,400 shares of Common Stock)

			7.		Sole Dispositive Power 0

			8.		Shared Dispositive Power See Row 6 above.

	9.	Aggregate Amount Beneficially Owned by Each Reporting Person See Row 6 above.

	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

	11.	Percent of Class Represented by Amount in Row (9) Approximately 5.1% as of the date of this filing (based on 23,842,808 shares of Common Stock issued and outstanding as of August 27, 2004).

	12.	Type of Reporting Person (See Instructions) PN; HC

Page 6 of 16

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Page 7 of 16 Pages

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Citadel Wellington Partners L.P. SE

	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		ý
		(b)		o

	3.	SEC Use Only

	4.	Citizenship or Place of Organization Delaware limited partnership U.S.A.

Number of Shares Beneficially Owned by Each Reporting Person With			5.		Sole Voting Power 0

			6.		Shared Voting Power 936,468 shares of Common Stock 2,854 call options (exercisable into 285,400 shares of Common Stock)

			7.		Sole Dispositive Power 0

			8.		Shared Dispositive Power See Row 6 above.

	9.	Aggregate Amount Beneficially Owned by Each Reporting Person See Row 6 above.

	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

	11.	Percent of Class Represented by Amount in Row (9) Approximately 5.1% as of the date of this filing (based on 23,842,808 shares of Common Stock issued and outstanding as of August 27, 2004).

	12.	Type of Reporting Person (See Instructions) PN; HC

Page 7 of 16

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Page 8 of 16 Pages

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Citadel Kensington Global Strategies Fund Ltd.

	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		ý
		(b)		o

	3.	SEC Use Only

	4.	Citizenship or Place of Organization Bermuda company

Number of Shares Beneficially Owned by Each Reporting Person With			5.		Sole Voting Power 0

			6.		Shared Voting Power 936,468 shares of Common Stock 2,854 call options (exercisable into 285,400 shares of Common Stock)

			7.		Sole Dispositive Power 0

			8.		Shared Dispositive Power See Row 6 above.

	9.	Aggregate Amount Beneficially Owned by Each Reporting Person See Row 6 above.

	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

	11.	Percent of Class Represented by Amount in Row (9) Approximately 5.1% as of the date of this filing (based on 23,842,808 shares of Common Stock issued and outstanding as of August 27, 2004).

	12.	Type of Reporting Person (See Instructions) CO; HC

Page 8 of 16

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Page 9 of 16 Pages

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Citadel Equity Fund Ltd.

	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		ý
		(b)		o

	3.	SEC Use Only

	4.	Citizenship or Place of Organization Cayman Islands company

Number of Shares Beneficially Owned by Each Reporting Person With			5.		Sole Voting Power 0

			6.		Shared Voting Power 936,468 shares of Common Stock 2,854 call options (exercisable into 285,400 shares of Common Stock)

			7.		Sole Dispositive Power 0

			8.		Shared Dispositive Power See Row 6 above.

	9.	Aggregate Amount Beneficially Owned by Each Reporting Person See Row 6 above.

	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

	11.	Percent of Class Represented by Amount in Row (9) Approximately 5.1% as of the date of this filing (based on 23,842,808 shares of Common Stock issued and outstanding as of August 27, 2004).

	12.	Type of Reporting Person (See Instructions) CO

Page 9 of 16

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Page 10 of 16 Pages

	1.	Names of Reporting Persons. I.R.S. Identification Nos. of above persons (entities only) Citadel Derivatives Group LLC

	2.	Check the Appropriate Box if a Member of a Group (See Instructions)
		(a)		ý
		(b)		o

	3.	SEC Use Only

	4.	Citizenship or Place of Organization Delaware limited liability company U.S.A.

Number of Shares Beneficially Owned by Each Reporting Person With			5.		Sole Voting Power 0

			6.		Shared Voting Power 936,468 shares of Common Stock 2,854 call options (exercisable into 285,400 shares of Common Stock)

			7.		Sole Dispositive Power 0

			8.		Shared Dispositive Power See Row 6 above.

	9.	Aggregate Amount Beneficially Owned by Each Reporting Person See Row 6 above.

	10.	Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) o

	11.	Percent of Class Represented by Amount in Row (9) Approximately 5.1% as of the date of this filing (based on 23,842,808 shares of Common Stock issued and outstanding as of August 27, 2004).

	12.	Type of Reporting Person (See Instructions) OO

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Page 11 of 16 Pages

Item 1.
	(a)	Name of Issuer CYBERONICS, INC.
	(b)	Address of Issuer’s Principal Executive Offices 100 Cyberonics Center Blvd. Suite 600 Houston, TX 77058

Item 2.
	(a)	Name of Person Filing
	(b)	Address of Principal Business Office or, if none, Residence
	(c)	Citizenship

Citadel Limited Partnership

131 S. Dearborn Street, 32nd Floor

Chicago, Illinois 60603

Illinois limited partnership

GLB Partners, L.P.

131 S. Dearborn Street, 32nd Floor

Chicago, Illinois 60603

Delaware limited partnership

Citadel Investment Group, L.L.C.

131 S. Dearborn Street, 32nd Floor

Chicago, Illinois 60603

Delaware limited liability company

Kenneth Griffin

131 S. Dearborn Street, 32nd Floor

Chicago, Illinois 60603

U.S. Citizen

Citadel Wellington Partners L.P.

c/o Citadel Investment Group, L.L.C.

131 S. Dearborn Street, 32nd Floor

Chicago, Illinois 60603

Illinois limited partnership

Citadel Wellington Partners L.P. SE

c/o Citadel Investment Group, L.L.C.

131 S. Dearborn Street, 32nd Floor

Chicago, Illinois 60603

Delaware limited partnership

Page 11 of 16

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Page 12 of 16 Pages

Citadel Kensington Global Strategies Fund Ltd.

c/o Citadel Investment Group, L.L.C.

131 S. Dearborn Street, 32nd Floor

Chicago, Illinois 60603

Bermuda company

Citadel Equity Fund Ltd.

c/o Citadel Investment Group, L.L.C.

131 S. Dearborn Street, 32nd Floor

Chicago, Illinois 60603

Cayman Islands company

Citadel Derivatives Group LLC
c/o Citadel Investment Group, L.L.C.
131 S. Dearborn Street, 32nd Floor
Chicago, Illinois 60603
Delaware limited liability company

	(d)	Title of Class of Securities Common Stock, par value $0.01 per share
	(e)	CUSIP Number 23251P102

Item 3.	If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
	(a)	o	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).
	(b)	o	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).
	(c)	o	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).
	(d)	o	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).
	(e)	o	An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);
	(f)	o	An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);
	(g)	o	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
	(h)	o	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
	(i)	o	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
	(j)	o	Group, in accordance with §240.13d-1(b)(1)(ii)(J).

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If this statement is filed pursuant to Rule 13d-1(c), check this box. ý

Item 4.	Ownership
CITADEL LIMITED PARTNERSHIP GLB PARTNERS, L.P. CITADEL INVESTMENT GROUP, L.L.C. KENNETH GRIFFIN CITADEL WELLINGTON PARTNERS L.P. CITADEL WELLINGTON PARTNERS L.P. SE CITADEL KENSINGTON GLOBAL STRATEGIES FUND LTD. CITADEL EQUITY FUND LTD. CITADEL DERIVATIVES GROUP LLC
Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.
	(a)	Amount beneficially owned: 936,468 shares of Common Stock 2,854 call options (exercisable into 285,400 shares of Common Stock)
	(b)	Percent of class: Approximately 5.1% as of the date of this filing (based on 23,842,808 shares of Common Stock issued and outstanding as of August 27, 2004).
	(c)	Number of shares as to which the person has:
		(i)	Sole power to vote or to direct the vote 0
		(ii)	Shared power to vote or to direct the vote See item (a) above.
		(iii)	Sole power to dispose or to direct the disposition of 0
		(iv)	Shared power to dispose or to direct the disposition of See item (a) above.

Item 5.	Ownership of Five Percent or Less of a Class
	Not Applicable.

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Item 6.	Ownership of More than Five Percent on Behalf of Another Person
	Not Applicable.

Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person
	See Item 2 above.

Item 8.	Identification and Classification of Members of the Group
	Not Applicable.

Item 9.	Notice of Dissolution of Group
	Not Applicable.

Item 10.	Certification
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.
* Adam C. Cooper is signing on behalf of Kenneth Griffin as attorney-in-fact pursuant to a power of attorney previously filed with the Securities and Exchange Commission on November 19, 2002, and hereby incorporated by reference herein. The power of attorney was filed as an attachment to a filing by Citadel Limited Partnership on Form 3 for Metals USA, Inc.

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Page 15 of 16 Pages

Signature

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated this 15th day of October, 2004		KENNETH GRIFFIN

		By:	/s/ Adam C. Cooper
			Adam C. Cooper, attorney-in-fact*


CITADEL LIMITED PARTNERSHIP		CITADEL INVESTMENT GROUP, L.L.C.

By:	GLB Partners, L.P.,	By:	/s/ Adam C. Cooper
	its General Partner		Adam C. Cooper, Senior Managing
			Director and General Counsel

By:	Citadel Investment Group, L.L.C., its General Partner	CITADEL EQUITY FUND LTD.

By:	/s/ Adam C. Cooper	By:	Citadel Limited Partnership,
	Adam C. Cooper, Senior Managing Director and General Counsel		its Portfolio Manager

GLB PARTNERS, L.P.		By:	GLB Partners, L.P., its General Partner

By:	Citadel Investment Group, L.L.C., its General Partner	By:	Citadel Investment Group, L.L.C., its General Partner

By:	/s/ Adam C. Cooper	By:	/s/ Adam C. Cooper
	Adam C. Cooper, Senior Managing Director and General Counsel		Adam C. Cooper, Senior Managing Director and General Counsel

CITADEL WELLINGTON PARTNERS L.P.		CITADEL KENSINGTON GLOBAL STRATEGIES FUND LTD.

By:	Citadel Limited Partnership, its General Partner	By:	Citadel Limited Partnership, its Portfolio Manager

By:	GLB Partners, L.P., its General Partner	By:	GLB Partners, L.P., its General Partner

By:	Citadel Investment Group, L.L.C., its General Partner	By:	Citadel Investment Group, L.L.C., its General Partner

By:	/s/ Adam C. Cooper	By:	/s/ Adam C. Cooper
	Adam C. Cooper, Senior Managing Director and General Counsel		Adam C. Cooper, Senior Managing Director and General Counsel

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CITADEL WELLINGTON PARTNERS L.P. SE		CITADEL DERIVATIVES GROUP LLC

By:	Citadel Limited Partnership, its General Partner	By:	Citadel Limited Partnership, its Managing Member

By:	GLB Partners, L.P., its General Partner	By:	GLB Partners, L.P., its General Partner

By:	Citadel Investment Group, L.L.C., its General Partner	By:	Citadel Investment Group, L.L.C., its General Partner

By:	/s/ Adam C. Cooper	By:	/s/ Adam C. Cooper
	Adam C. Cooper, Senior Managing Director and General Counsel		Adam C. Cooper, Senior Managing Director and General Counsel

Page 16 of 16