Exhibit 10.24

PURCHASE AGREEMENT

Agreement Number SS02AUG2007

This Purchase Agreement (hereinafter the “Agreement”) is entered into between:

Contract Manufacturer

Plexus Services Corp.

55 Jewelers Park Drive

Neenah, WI 54956

Hereinafter referred to as “Seller”

and

Hansen Medical, Inc.

380 North Bernardo Avenue

Mountain View, CA 94043

Hereinafter referred to as “Buyer”.

In consideration for the mutual obligations herein contained, the Seller and Buyer (hereinafter referred to as the “Parties”) agree as follows:

This Agreement shall commence and be effective as of September 21, 2007 and shall remain in effect for Twenty-Four (24) months to order and to ship Products from the effective date of this Agreement unless terminated sooner under the provisions set forth herein. Thereafter, the Agreement may be extended for an additional period by mutual written agreement of the Parties.

This Agreement contains the following Attachments, which are incorporated herein and made a part of this Agreement:

Attachment A – Plexus Markup Model

Attachment B – Intentionally Omitted

Attachment C – Intentionally Omitted

Attachment D – Mutual Nondisclosure Agreement (effective May 9, 2007)

Subject to the terms and conditions of this Agreement, Buyer agrees to purchase for resale by Buyer and its distributors throughout the world, the Products described in applicable active quotations and Purchase Orders (each a “Product”), as such documentation may be changed from time to time by the Parties, in quantities specified by Buyer, and Seller agrees to manufacture and sell to Buyer such Products.

This Agreement, which is not considered a purchase order, sets forth the overriding terms and conditions of sale between Buyer and Seller. This Agreement does not authorize Seller to produce or deliver any Products. Buyer shall be responsible only for those Products which have been released on an official purchase order or as provided hereunder. Official purchase orders for Product may be issued, at Buyer’s discretion, from multiple locations of Buyer’s facilities of both domestic and international origins associated with any of Buyer’s Products.

On a quarterly or more frequent basis, Buyer shall provide to Seller, a nonbinding rolling quantity forecast of delivery requirements indicating the delivery requirements projected for the next [***] for the Product. This forecast shall in no way be deemed a commitment for Buyer to purchase any Products. Buyer will issue purchase orders at least [***] prior to the required delivery dates for Product. Buyer’s purchase orders and/or subsequent purchase order alterations for delivery with lead times of less than [***] will be mutually agreed to by both Parties.

Component Lead-Time + MRP Lead-Time + Dock to Stock Lead-Time taking into account Minimum Buys

Seller shall submit invoices that identify the following:

Purchase order number

Buyer’s part number

Quantity of delivery

Unit Price

Date of Delivery

Buyer’s Name

Invoices shall not deviate in terms from this Agreement without Buyer’s express written consent.

The term “Engineering Change” (hereinafter referred to as “EC”) shall mean mechanical or electrical design, material and/or specification changes which, if made to the Product to be supplied hereunder, would affect the delivery schedule, availability, performance, function, reliability, serviceability, form, appearance, fit, dimensions, tolerance, safety or purchase price of such Product or which, in Buyer’s opinion, would require additional testing and evaluation of the Product to ensure its suitability for Buyer’s intended purposes. Any such changes shall be subject to the terms as set forth in Section 7.2 and 7.3.

Seller shall not make any significant process changes without the prior written notice to the Buyer (“Process Change”). Examples of such significant Process Changes shall include such actions as: changes in solder, flux, epoxies, wash chemistry, or changes in material profiles, but shall exclude the movement or relocation of assembly and test equipment, limited to Seller’s Production facility now located and known as “Seller Manufacturing Center, Seller Address”, which do not affect the Product’s form, fit, or function.

Seller shall promptly inform Buyer of any ideas it may have for ECs for the Product or the Process Change(s) used to manufacture the Product, as well as any cost increase or decrease associated with such change or improvement as long as such ECs are not in violation of confidentiality agreements relating to any other of Seller’s customers. ECs proposed by Seller shall be set forth in detail, in writing, and submitted to Buyer for comprehensive evaluation, testing and specification. In such writing, Seller shall include:

(a) the amount of rework necessary to implement any such EC,

(b) any increase or decrease in unit pricing of Products,

(c) lead time required to implement the proposed EC,

(d) impact on material that will become obsolete and/or

(e) any non-recurring engineering charge to implement the proposed EC.

Seller shall not proceed with any EC until Buyer provides its written approval. Seller shall deliver to Buyer upon request units of the Product incorporating the EC, to perform testing and evaluation prior to approving incorporation of the EC into the Product. Buyer and Seller agree to share [***] any cost savings realized as a result of incorporation of the EC as submitted by Seller for a period of [***] After [***], all cost savings resulting from the EC shall pass to Buyer.

Buyer may, by written notice to Seller, require ECs to the Product. Seller shall use commercially best efforts to respond, in writing, to Buyer within [***] of receipt of such notice, unless a longer period is mutually agreed upon in writing, with the following information:

(a) the amount of rework necessary to implement any such EC,

(b) any increase or decrease in unit pricing of Products,

(c) lead time required to implement the proposed EC,

(d) impact on material that will become obsolete and/or

(e) any non-recurring engineering charges to implement the proposed EC.

Seller shall not proceed with any EC until Buyer provides its written approval. Subject to Buyer’s approval of the proposed EC, Seller may increase prices for the Product, spare parts and service tools pursuant to the mutual agreement of the Parties. ECs developed, initiated, and financed by Buyer, and resulting in cost-reduction of Products, will be fully realized in the price of Products listed in Attachment A.

Seller agrees to work in good faith toward cost-reduction efforts for the Products. Cost Reduction may include, but shall not be limited to: process improvements; value analysis; process changes; implementation of enhanced tooling; test or manufacturing equipment; improved subcontract sourcing; and process efficiencies associated with the learning curve process. Buyer expects and bases all future renewals of this purchase agreement on target cost decreases to be mutually agreed to in writing during the period of discussion prior to each contract renewal. Buyer agrees to make commercially best efforts in reviewing all suggestions for such cost-reduction promptly and assist Seller as required to implement cost reduction plans.

Buyer may also require Seller to analyze the material feasibility of schedule increases proposed by Buyer. Seller shall use commercially best efforts to perform such analysis and respond in writing to Buyer within [***] after receipt of the proposed schedule increases with the following information:

In the event Seller and Buyer do not agree to an extension of the term of this Agreement, Buyer shall have the right, subject to material availability, to continue providing purchase orders and forecasts for Products to be delivered on the dates specified by Buyer pursuant to the terms and conditions of this Agreement, and Seller shall continue manufacturing and selling Products to Buyer, so long as delivery of such Products is no later than [***] after the termination of this Agreement. Material shall be deemed unavailable under this Section 8.1 if it is completely unavailable at any price. If the Buyer’s Purchase Order quantity cannot be completely filled due to unavailability of material, it should be filled to the extent that the material is available. The terms and conditions of this Agreement shall continue in full force and effect until the last delivery made on such Products. Buyer agrees to use its best effort to obtain a new supplier within [***].

Either Party may terminate this Agreement immediately upon written notice to the other Party if: (i) the other Party has failed to cure a material breach of this Agreement or fails to submit an acceptable plan to cure said breach within [***] after receipt of written notice of such breach from a Party; (ii) the other Party ceases to do business in the normal course, becomes insolvent, files a petition under the federal bankruptcy laws, or has such a petition filed against it which is not dismissed within [***] after such filing, files for protection from its creditors under the insolvency laws of any state, has a receiver appointed with respect to any of its assets or makes a general assignment for the benefit of its creditors; or (iii) the other Party breaches the terms of the Proprietary Information Agreement per Attachment D. Termination under this Section 8.2 is in addition to any other right or remedy a Party may have under this Agreement, at law, or in equity. In no case, however, shall Buyer’s liability for termination of this Agreement or of any Purchase Orders pursuant to Section 8.2 of this Agreement exceed the following: Seller’s current quoted price plus material overhead as set forth in Attachment A for the material acquired pursuant to Section 4.3.2. Upon payment to Seller from Buyer for such material, Seller shall immediately deliver said material with title and risk of loss passing to Buyer upon delivery of said material. Payment terms are as set forth in section 5.5.

Buyer may terminate for its convenience and without cause this Agreement and/or any purchase orders issued against this Agreement at any time in whole or part by delivering [***] written notice of termination to Seller. Seller may terminate for its convenience and without cause this Agreement and/or any purchase orders issued against this Agreement at any time in whole or part by delivering [***] written notice of termination to Seller. Seller shall make every reasonable effort to cancel all applicable purchase orders and reduce inventory through return for credit programs, allocating materials for alternate programs if applicable, reselling, and all other appropriate actions in order to mitigate charges associated with finished goods, work in process, and raw materials resulting from cancellation. Any costs that may be incurred to make such mitigation will be reviewed by the Buyer and approved by Buyer prior to any commitment by Seller to incur such costs. Buyer’s liability to Seller for any quantity of Excess Components and/or Obsolete Components procured by Seller pursuant to Section 4.3 shall be limited to Seller’s current quoted price plus material overhead as set forth in Attachment A. In no case, however, shall Buyer’s liability for termination of this Agreement or of any Purchase Orders pursuant to Section 8.3 of this Agreement exceed the following:

Upon written notice to Seller from Buyer for return of the material, Seller shall immediately deliver to Buyer said material with title and risk of loss passing to Buyer upon delivery of said material. Payment terms are as set forth in section 5.5.

Seller agrees to provide out-of-warranty repair, replacement and refurbishment services and spare parts with respect to the Products. Such services and spare parts shall be negotiated between the parties in good faith in accordance with this section. Seller and Buyer agree to enter into good faith negotiations for Seller to repair out-of-warranty Products and provide spare parts for Products for a period of not less than [***] from the last production ship date of the Product under a separate agreement, and provided that Seller has access to appropriate test fixtures and equipment.

As Seller is notified by component suppliers and distributors of the end of availability of a given part due to obsolescence or manufacturing changes, Seller will notify Buyer immediately in writing with attached documentation from the supplier or distributor supporting the notification. Seller will work with suppliers and distributors to give as much advanced notice as possible to Buyer, and to reduce the exposure of loss of material availability by seeking alternate sources or allocations. Seller will seek distributors who will bond end-of-life material for Buyer’s use to mitigate the need for end-of-life buys, to avoid, if possible, non-cancellable/non-returnable requirements and to minimize any additional handling or storage fees.

Confidentiality and Intellectual Property. Any technical, financial, business or other information provided by one party (the “Disclosing Party”) to the other party (the “Receiving Party”) and designated as confidential or proprietary (“Proprietary Information”) shall be held in confidence and not disclosed and shall not be used, pursuant to the Mutual Nondisclosure Agreement signed by the Parties on May 9, 2007, incorporated by reference herein and duplicated for convenience in Attachment D. The terms and conditions of the Mutual Nondisclosure Agreement shall stay in effect until the termination, cancellation or expiration of this Agreement, regardless of the term of such agreement.

Delay or default in performance arising from acts of God or contingencies beyond the reasonable control of either Party hereto shall not be deemed a breach of this Agreement by such Party. The affected Party shall notify the other Party within [***] of discovery and/or occurrence of such acts or contingencies. In the event of any such act or contingency affecting Seller’s performance beyond [***], Buyer at its option, may elect either to have the quantities so affected eliminated or to extend the period for delivery of the quantities so affected. Such elimination or extension shall be governed by Section 7.5 and Section 8.

Neither Party shall be liable for any special, incidental, indirect or consequential damages, including reimbursement for lost profits, whether in contract or in tort, and regardless of whether or not it was advised of the possibility or certainty of such damage, arising from either Party’s performance under this Agreement.

Seller shall defend, indemnify and hold Buyer and its officers, directors, agents and employees harmless from liability (including all damages, losses, costs and attorneys fees) arising out of (i) infringement by the Seller’s manufacturing process, know-how, and/or trade secrets used in manufacturing the Products of any intellectual property rights of any third party, including patent rights, trademark rights, copyrights or other proprietary rights, or (ii) the negligence or willful misconduct of Seller.

Buyer shall defend, indemnify and hold Seller and its officers, directors, agents and employees harmless from liability (including all damages, losses, costs and attorneys fees) arising out of sale or use of the Product, including but not limited to product related liabilities or intellectual property infringement.

All notices under this Agreement shall be in writing, and shall be deemed given when personally delivered, when sent by confirmed fax, or three days after being sent by prepaid certified or registered U.S. mail to the address of the party to be noticed as set forth herein or such other address as such party last provided to the other by written notice.

All documents that Buyer submits to Seller are owned by Buyer. These shall not be used by Seller for any purpose other than to produce (including any purchase of components) Products for Buyer under the terms and conditions of this Agreement. All such documents shall be deemed Proprietary Information under the terms of the Mutual Nondisclosure Agreement, effective May 9, 2007, set forth in Attachment D. Upon the earlier to occur of expiration or termination of this Agreement and Buyer’s request, Seller will deliver promptly to Buyer all of these documents and any copies thereof.

All tooling produced or obtained for the Product delivered hereunder and paid for by Buyer shall become and remain the property of Buyer. The title to all tooling purchased or manufactured pursuant to this Agreement shall pass to Buyer upon acceptance by Buyer, in the form of authorization of payment of the invoice, for said tooling and prior to the time the tooling is used by Seller. Such tooling shall be used by Seller only for the benefit of Buyer, and shall be delivered to Buyer upon request. Seller shall provide Buyer with a complete inventory of tooling created or procured for Buyer.

No right or interest in this Agreement or obligation under this Agreement shall be assigned by either Buyer or Seller, excepting from an assignment to a wholly-owned subsidiary or affiliate of either Buyer or Seller, now located and known as “Seller Manufacturing Center, Seller Address”, without the prior written permission of the other Party, provided, however, that Buyer may assign this Agreement to another Party without the prior written permission of Seller for the purpose of such other Party’s incorporating the Product into Products to be sold by Buyer.

Neither Party shall advertise, market, or otherwise make known to others any information relating to this Agreement without the prior written consent of the other Party except as required by law or regulation.

The failure of either Party, at any time, to enforce any of the provisions of this Agreement shall not be construed to be a waiver of the right of such Party thereafter to enforce each and every provision of this Agreement.

The relationship between the Parties is that of independent contractors. No franchise, partnership, joint venture or relationship of principal and agent is intended. The Parties agree that they shall not take any action or omit to take any action, the effect of which act or omission shall obligate or bind the other Party to any act, commitment, obligation or payment to third Parties, including governmental agencies, without the written consent of the other Party of except as authorized by this Agreement. Nothing contained herein is intended to or shall confer in either Party any right to effect any decisions of the other Party with respect to the other Party’s conduct of its business.

“Epidemic Failure” shall mean those substantial deviations from the specifications which seriously impair the use of Products existing at the time of delivery but which are not reasonably discernible at that time and which are evidenced by an identical, repetitive defect due to the same cause and occurring in the same series of the Products and exceeding [***] of the Products delivered within [***] of the date of manufacture. In the event an epidemic failure is identified by Buyer, Buyer agrees to consult with Seller and the Parties agree to mutually address the failure and reasonable remedial actions necessary to resolve the failure mode.

This Agreement, including the Attachments here to, may not be modified or terminated orally, and no claimed modification, termination, or waiver shall be binding unless in writing and signed by both Parties.

This Agreement will be governed by and construed in accordance with the laws of the State of New York.

At any time during working hours upon reasonable notice, Buyer shall have the right to audit Seller’s manufacturing facilities and processes. Such audit shall be on an annual basis, provided that such audit may occur more frequently if Buyer has any concerns about such facilities and processes. The audit will only be of those areas that are directly related to Buyer’s Product.

Except for the terms of the Mutual Nondisclosure Agreement between the Parties effective May 9, 2007, this Agreement embodies the entire understanding between the Parties, and any prior or contemporaneous representations, either oral or written, are hereby superseded. No amendments or changes to this Agreement shall be effective unless made in writing and signed by authorized representatives of the Parties. In the event of conflict between the terms of this Agreement, and the terms of any other related agreement between the Parties (such as a purchase order), the terms of this Agreement shall control unless mutually agreed to the contrary in writing by the Parties on a case-by-case basis. If for any reason a court of competent jurisdiction finds any provision of this Agreement, or portion thereof, to be unenforceable, that provision of the Agreement shall be enforced to the maximum extent permissible so as to effect the intent of the Parties, and the remainder of this Agreement shall continue in full force and effect.

AGREED AND ACCEPTED

Attachment A

PLEXUS CONFIDENTIAL

Material Pricing Model

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