Document:

<PAGE>

                                                                 EXHIBIT 10.9(a)

                            FIRST AMENDMENT TO LEASE

THIS FIRST AMENDMENT TO LEASE (hereinafter "Amendment") is made this 8th day of
July 1996, by and between McCANDLESS LIMITED, a California limited partnership
(Landlord") and ENVISION SURGICAL SYSTEMS, INC., a California corporation doing
business as Novacept ("Tenant").

                                    RECITALS

                  A. Tenant currently leases from Landlord approximately eight
         thousand six hundred and fifty (8,650) square feet of space located at
         1047 Elwell Court, Palo Alto, California (the 'Premises") pursuant to
         that certain lease dated August 26, 1993 ("Lease").

                  B. The Lease provides for a termination date of August 25,
         1996.

                  C. Tenant desires to extend the term of the Lease pursuant to
         paragraph 56 of the Lease and Landlord is willing to extend the term of
         the Lease on the terms and conditions set forth herein.

NOW, THEREFORE, in consideration of the above recitals and the mutual covenants
and agreements contained herein and other good and valuable consideration the
receipt and sufficiency of which are hereby acknowledged, the parties hereby
agree as follows:

                  1. Term. The term of the Lease is hereby extended for an
additional two (2) years and six (6) days, so that the term of the Lease shall
extend to and include August 31, 1998. The period commencing on August 26, 1996
and ending on August 31, 1998 is referred to herein as the First Extended Term.

                  2. Basic Rent. Paragraphs 4 (a) and 5 of the Lease are hereby
amended to provide that the amount of basic rent due and payable under the Lease
during the First Extended Term shall be Eleven Thousand Ninety-Three and 63/100
Dollars ($11,093.63) per month from September 1, 1996 until August 31, 1997 and
Eleven Thousand Five Hundred and Four and 50/100 Dollars ($11,504.50) per month
from September 1, 1997 until August 31, 1998 as described below:

September 1, 1996 until August 31, 1997       $11,093.63/mo.

September 1, 1997 until August 31, 1998       $11,504.50/mo.

The basic rent during the last six days of August, from August 26, 1996 to
August 31, 1996, shall be one thousand six hundred forty-three and 50/100
Dollars ($1,643.50), the prorated share of August, 1996 basic rent at the rate
of $8,217.50 per month prevailing during the last lease month of the original
Lease.

                                       1
<PAGE>

                  3. Restatement of Other Lease Terms. Except as specifically
modified herein, all other terms, covenants and conditions of the Lease,
including Tenant's obligation to pay common area charges, shall remain in full
force and effect.

                  4. Landlord's Address. For purposes of notification as
provided in paragraph 38 of the Lease, Landlord's address is hereby changed to:

                                        McCandless-Simons
                                        P.O. Box 872
                                        Los Altos, CA 94023-0872

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
day and year first above written.

                         LANDLORD:

                         McCANDLESS LIMITED,
                         a California limited partnership

                         By: /s/ Charles S. McCandless
                         ---------------------------------------------------
                                        Charles S. McCandless, as Trustee
                                        under the Charles S.McCandless and
                                        Jean A. McCandless Inter Vivos Trust
                                        Agreement dated January 25, 1977, a
                                        General Partner
                                           7-8-96
                         ---------------------------------------------------
                                            (Date)

                         TENANT:

                         ENVISION SURGICAL SYSTEMS, INC.,
                         a California corporation, dba Novacept.

                         By: /s/ Csaba Truckai
                         ---------------------------------------------------
                                  (Signature)

                                 CSABA TRUCKAI
                         ---------------------------------------------------
                                  (Printed Name)

                               V. P. OF R. & D.
                         ---------------------------------------------------
                                  (Title)

                                  07.01.96
                         ---------------------------------------------------
                                    (Date)

                                       2<PAGE>

                                                                 EXHIBIT 10.9(b)

                            SECOND AMENDMENT TO LEASE

THIS SECOND AMENDMENT TO LEASE (hereinafter "Amendment") is made this 13th day
of May 1998, by and between McCANDLESS LIMITED, a California limited partnership
(Landlord") and NOVACEPT, a California corporation formerly known as Envision
Surgical Systems, Inc. ("Tenant").

                                    RECITALS

                  A. Tenant currently leases from Landlord approximately eight
         thousand six hundred and fifty (8,650) square feet of space located at
         1047 Elwell Court, Palo Alto, California (the "Initial Premises")
         pursuant to that certain lease dated August 26, 1993 as amended by the
         First Amendment To Lease dated July 8, 1996 ("Lease"). The Initial
         Premises are shown on Exhibit A attached hereto.

                  B. Tenant desires to expand the Premises by adding
         approximately two thousand eight hundred and eleven (2,811) square feet
         of additional space located at 1056 Elwell Court, Palo Alto (the
         "Expansion Space"). The Expansion Space is shown on Exhibit B attached
         hereto.

                  C. As described in the First Amendment To Lease, Tenant has
         exercised its option to extend the term pursuant to paragraph 56 of the
         Lease and the Lease as amended provides for a termination date of
         August 31, 1998.

                  D. Tenant desires to extend the term of the Lease for one
         additional year.

                  E. Landlord is willing to so extend the term of the Lease and
         to so expand the Premises on the terms and conditions set forth herein.

NOW, THEREFORE, in consideration of the above recitals and the mutual covenants
and agreements contained herein and other good and valuable consideration the
receipt and sufficiency of which are hereby acknowledged, the parties hereby
agree as follows:

                  1. Term. The term of the Lease is hereby extended for one (1)
additional year, so that the term of the Lease shall extend to and include
August 31, 1999. The period commencing on September 1, 1998 and ending on August
31, 1999 is referred to herein as the Second Extended Term.

                  2. Premises. Commencing on the Effective Date, as defined in
paragraph 3 below, the Expansion Space shall be added to the Initial Premises
and, thereafter, the total area leased shall be increased from approximately
eight thousand six hundred and fifty (8,650) square feet to approximately eleven
thousand four hundred and sixty-one (11,461) square feet.

                  3. Effective Date. As used herein, the Effective Date shall be
the date upon which the earliest of the following occurs:

                           (a) Substantial completion of all sewer line repair
work to be done by landlord in the Expansion Space and the repair of all
substantial holes, if any, in the Expansion Space walls and ceiling as described
in Paragraph 7 below, subject to Tenant's right to have any incomplete or
defective work, which Tenant describes in writing to Landlord within thirty days
of Tenant's occupancy, completed or repaired promptly after the Effective Date;
or

                           (b) Occupancy of the Expansion Space by any of
Tenant's operating

                                       1
<PAGE>

personnel.

                  4. Basic Rent. Paragraphs 4 (a) and 5 of the Lease and
paragraph 2 of the First Amendment To Lease are hereby amended to provide that
the amount of basic rent due and payable under the Lease shall be as described
below:

                     Effective Date until August 31, 1998      $17,829.25/mo.

                     September 1,1998 until August 31, 1999    $24,922.25/mo.

                  The above calculations are predicated on basic rent of $2.25
per square foot per month triple net as of the Effective Date for the Expansion
Space and basic rent of $2.15 per square foot per month triple net as of
September 1, 1998 for the Initial Premises. From the Effective Date until August
31, 1998, the Basic Rent for the Initial Premises shall remain the same at
$11,504.50 per month or approximately $1.33 per square foot per month triple
net. Basic Rent from the Effective Date until August 31, 1998 is therefore
calculated as follows: (8,650 SF x $1.33/SF)+(2,811 SF x $2.25/SF) =
$17,829.25/month. Basic Rent from September 1, 1998 until August 31, 1999 is
therefore calculated as follows: (8,650 SF x $2.15/SF)+(2,811 SF x $2.25/SF) =
$24,922.25/month.

                  5. Common Area Charges. Commencing on the Effective Date,
Tenant's proportionate share of common area charges shall be modified by
providing that in addition to the common area charges with respect to the
Initial Premises (which is 55.52% of the common area charges allocable to the
building in which the Initial Premises is located) as set forth in paragraph 16
on the Lease, Tenant shall also pay to Landlord as additional rent, an amount
equal to fifteen and ninety-eight one-hundredths percent (15.98%) of the total
common area charges as defined in paragraph 16 of the Lease allocable to the
building in which the Expansion Space is located, which is determined by
dividing 2,811 (the square footage of the Expansion Space) by 17,595 (the square
footage of the building in which the Expansion Space is located). Commencing on
the Effective Date, Tenant's payment of its estimated share of common area
charges shall be increased to a total of Two Thousand and Nine and 00/100
Dollars ($2,009.00) per month and shall be reconciled and adjusted thereafter in
accordance with paragraph 5 (b) of, the Lease.

                  6. Parking. Commencing on the Effective Date, Tenant's right
to the non-exclusive use of the parking spaces, as defined in paragraph 15 of
the Lease, shall be increased from thirty-four (34) spaces to forty-six (46)
spaces.

                  7. Expansion Space Taken "As Is". Tenant is leasing the
Expansion Space "as is" in its current condition and Landlord shall have no
obligation to improve, alter or modify the Expansion Space in any way, except
that Landlord shall, at Landlord's sole cost, shampoo the carpet and clean the
vinyl floor in such space and repair all substantial holes in the walls and
ceilings which reasonably require repair, if any, prior to the Effective Date.

                  8. Brokers. Each party represents that it has not had any
dealings with any real estate broker, finder or other person with respect to
this Amendment or expanding the Premises, and that there are no leasing
commissions to be paid by Landlord or Tenant in connection with this
transaction. Each party hereto shall hold harmless the other party from all
damages, loss or liability resulting from any claims that may be asserted
against the other party by any broker, finder or other person with whom such
party has dealt, or purportedly has dealt, in connection with this transaction.

                  9. Option To Extend Term. Tenant has previously exercised its
option to extend the term as described in paragraph 56 of the Lease and has no
further options to extend the term under the Lease or any amendments to the
Lease.

                                        2
<PAGE>
                  10. Restatement of Other Lease Terms. Except as specifically
modified herein, all other terms, covenants and conditions of the Lease,
including Tenant's obligation to pay common area charges, shall remain in full
force and effect.

                  11. Signage. Tenant shall be responsible for the cost and
installation of Tenant's signage and such signage shall be subject to the
Landlord approval, provided, however that Landlord shall contribute $200.00
towards the cost of Tenant's signage.

                  12. Landlord's Address. For purposes of notification as
provided in paragraph 38 of the Lease Landlord's address is hereby changed to:

                           McCandless Simons Company, Inc.
                           360 S. San Antonio Road, Suite 14
                           Los Altos, CA 94023

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
day and year first above written.

              LANDLORD:

              McCANDLESS LIMITED,
              a California limited partnership

              By: /s/ Charles S. McCandless
              --------------------------------------------
              Charles S. McCandless, as Trustee under the Charles S. McCandless
              and Jean A. McCandless Inter Vivos Trust Agreement dated January
              25, 1977, a General Partner

                                   5/20/98
              --------------------------------------------
                                   (Date)

              TENANT:

              NOVACEPT, a California corporation formerly known
              as Envision Surgical Systems, Inc.

              By: /s/ D. R. Nathe
              --------------------------------------------
                           (Signature)

                Donald R. Nathe
              --------------------------------------------
                          (Printed Name)

                V. P. Operations
              --------------------------------------------
                             (Title)
                5.13.98
              --------------------------------------------
                              (Date)

                                       3

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00060-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00060-of-00352.parquet"}]]