Name of reporting person

I.R.S. identification number (entity only)

Jack W. Schuler

Check the appropriate box if a member of a group

(a)  ¨        (b)  x

SEC use only

Citizenship or place of organization

    United States

Number of

shares

beneficially

owned by

each

reporting

person

with:

Sole voting power

    5,294,659

Shared voting power

    129,312

Sole dispositive power

    5,294,659

Shared dispositive power

    129,312

  9

Aggregate amount beneficially owned by each reporting person

    5,423,971

10

Check if the aggregate amount in Row (9) excludes certain shares    ¨

11

Percent of class represented by amount in Row (9)

    8.9%

12

Type of reporting person

    IN

Name of reporting person

I.R.S. identification number (entity only)

Renate Schuler

Check the appropriate box if a member of a group

(a)  ¨        (b)  x

SEC use only

Source of funds

    PF

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)    ¨

Citizenship or place of organization

    United States

Number of

shares

beneficially

owned by

each

reporting

person

with:

Sole voting power

    16,000

Shared voting power

    129,312

Sole dispositive power

    16,000

Shared dispositive power

    129,312

11

Aggregate amount beneficially owned by each reporting person

    145,312

12

Check if the aggregate amount in Row (11) excludes certain shares    ¨

13

Percent of class represented by amount in Row (11)

    0.2%

14

Type of reporting person

    IN

Name of reporting person

I.R.S. identification number (entity only)

Schuler Family Foundation

EIN 36-4154510

Check the appropriate box if a member of a group

(a)  ¨        (b)  x

SEC use only

Citizenship or place of organization

    Illinois

Number of

shares

beneficially

owned by

each

reporting

person

with:

Sole voting power

    129,312

Shared voting power

    0

Sole dispositive power

    129,312

Shared dispositive power

  9

Aggregate amount beneficially owned by each reporting person

    129,312

10

Check if the aggregate amount in Row (9) excludes certain shares    ¨

11

Percent of class represented by amount in Row (9)

    0.2%

12

Type of reporting person

    CO

Name of reporting person

I.R.S. identification number (entity only)

Tanya Eva Schuler Trust

EIN 36-7205458

Check the appropriate box if a member of a group

(a)  ¨        (b)  x

SEC use only

Citizenship or place of organization

    Illinois

Number of

shares

beneficially

owned by

each

reporting

person

with:

Sole voting power

    278,547

Shared voting power

    0

Sole dispositive power

    278,547

Shared dispositive power

    0

  9

Aggregate amount beneficially owned by each reporting person

    278,547

10

Check if the aggregate amount in Row (9) excludes certain shares    ¨

11

Percent of class represented by amount in Row (9)

    0.5

12

Type of reporting person

    OO

Name of reporting person

I.R.S. identification number (entity only)

Therese Heidi Schuler Trust

EIN 36-7205459

Check the appropriate box if a member of a group

(a)  ¨        (b)  x

SEC use only

Citizenship or place of organization

    Illinois

Number of

shares

beneficially

owned by

each

reporting

person

with:

Sole voting power

    273,067

Shared voting power

    0

Sole dispositive power

    273,067

Shared dispositive power

    0

  9

Aggregate amount beneficially owned by each reporting person

    273,067

10

Check if the aggregate amount in Row (9) excludes certain shares    ¨

11

Percent of class represented by amount in Row (9)

    0.5%

12

Type of reporting person

    OO

Name of reporting person

I.R.S. identification number (entity only)

Tino Hans Schuler Trust

EIN 36-7205456

Check the appropriate box if a member of a group

(a)  ¨        (b)  x

SEC use only

Citizenship or place of organization

    Illinois

Number of

shares

beneficially

owned by

each

reporting

person

with:

Sole voting power

    278,328

Shared voting power

    0

Sole dispositive power

    278,328

Shared dispositive power

    0

  9

Aggregate amount beneficially owned by each reporting person

    278,328

10

Check if the aggregate amount in Row (9) excludes certain shares    ¨

11

Percent of class represented by amount in Row (9)

    0.5%

12

Type of reporting person

    OO

This Amendment No. 3 is filed to amend certain items of the Schedule 13G filed by certain of the reporting persons on November 15, 2011, as amended by Amendment No. 1 filed on January 30, 2012 and Amendment No. 2 filed on March 26, 2012 (as amended, the “Schedule 13G”).

This Amendment No. 3 reflects the purchase of 869,535 shares of Hansen Medical, Inc. common stock subsequent to the filing of Amendment No. 2. These shares consist of 508,850 shares purchased by Jack W. Schuler, 16,000 shares purchased by his wife, Renate Schuler, 115,361 shares purchased by the Tanya Eva Schuler Trust, 114,181 shares purchased by the Therese Heidi Schuler Trust and 115,143 shares purchased by the Tino Hans Schuler Trust.

The following items of the Schedule 13G are amended to read as follows:

(a).

Jack W. Schuler

Renate Schuler

Schuler Family Foundation

Tanya Eva Schuler Trust

Therese Heidi Schuler Trust

Tino Hans Schuler Trust

(b).

for Jack W. Schuler and the Schuler Family Foundation:

28161 North Keith Drive

Lake Forest, Illinois 60045

for Renate Schuler:

Crab Tree Farm

Post Office Box 531

Lake Bluff, Illinois 60044

for the Tanya Eva Schuler Trust, Therese Heidi Schuler Trust and Tino Hans Schuler Trust (the “Trusts”):

c/o H. George Schuler, Trustee

Schuler Development

1500 East Industrial Boulevard, Suite 225

McKinney, Texas 75069

(c).

for Jack W. Schuler and Renate Schuler:

United States

for the Schuler Family Foundation and each of the Trusts:

Illinois (state of organization)

Amount beneficially owned

The 6,269,913 shares of common stock for which this Schedule is filed consist of (i) 5,294,659 shares owned by Jack W. Schuler, (ii) 16,000 shares owned by Mr. Schuler’s wife, Renate Schuler, (iii) 129,312 shares owned by the Schuler Family Foundation, (iv) 278,547 shares owned by the Tanya Eva Schuler Trust, (v) 273,067 shares owned by the Therese Heidi Schuler Trust and (vi) 278,328 shares owned by the Tino Hans Schuler Trust (the three trusts, the “Trusts”).

The Schuler Family Foundation is a tax-exempt private operating foundation of which Mr. and Mrs. Schuler are two of the three directors.

The Trusts are irrevocable trusts that Mr. Schuler established for the benefit of his and Mrs. Schuler’s three children. All of the children are adults, and none of them resides with Mr. and Mrs. Schuler. Neither Mr. Schuler nor Mrs. Schuler is a trustee of any of the Trusts or has a pecuniary interest in any of the Trusts.

Mr. Schuler disclaims any beneficial interest in any of the shares owned by (i) Mrs. Schuler, (ii) the Schuler Family Foundation or (iii) any of the Trusts.

Mrs. Schuler disclaims any beneficial interest in any of the shares owned by (i) the Schuler Family Foundation or (ii) any of the Trusts.

Percent of Class

10.3%

sole power to vote or to direct the vote:

5,294,659

shared power to vote or direct the vote:

129,312*

sole power to dispose or to direct the disposition of:

5,294,659

shared power to dispose of to direct the disposition of:

129,312*

*  Mr. Schuler shares the voting and dispositive power in respect of the 129,312 shares owned by the Schuler Family Foundation. Mr. Schuler is one of three directors of the foundation. The other two directors are Mr. Schuler’s wife, Renate Schuler, and their daughter, Tanya Schuler.

for Mrs. Schuler:

(i)

sole power to vote or to direct the vote:

16,000

(ii)

shared power to vote or direct the vote:

129,312*

(iii)

sole power to dispose or to direct the disposition of:

16,000

(iv)

shared power to dispose of to direct the disposition of:

129,312*

*  Mrs. Schuler shares the voting and dispositive power in respect of the 129,312 shares owned by the Schuler Family Foundation. Mrs. Schuler is one of three directors of the foundation. The other two directors are Mrs. Schuler’s husband, Jack W. Schuler, and their daughter, Tanya Schuler.

for the Schuler Family Foundation:

(i)

sole power to vote or to direct the vote:

129,312

(ii)

shared power to vote or direct the vote:

0

(iii)

sole power to dispose or to direct the disposition of:

129,312

(iv)

shared power to dispose of to direct the disposition of:

0

for the Tanya Eva Schuler Trust:

(i)

sole power to vote or to direct the vote:

278,547

(ii)

shared power to vote or direct the vote:

0

(iii)

sole power to dispose or to direct the disposition of:

278,547

(iv)

shared power to dispose of to direct the disposition of:

0

for the Therese Heidi Schuler Trust:

(i)

sole power to vote or to direct the vote:

273,067

(ii)

shared power to vote or direct the vote:

0

(iii)

sole power to dispose or to direct the disposition of:

273,067

(iv)

shared power to dispose of to direct the disposition of:

0

for the Tino Hans Schuler Trust:

(i)

sole power to vote or to direct the vote:

278,328

(ii)

shared power to vote or direct the vote:

0

(iii)

sole power to dispose or to direct the disposition of:

278,328

(iv)

shared power to dispose of to direct the disposition of:

0

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, other than activities solely in connection with a nomination under §240.12a-11.