The Guidant Microwave Ablation System is indicated for the surgical ablation of soft tissue, and striated, cardiac, and smooth muscles. The System is a device indicated for use, under direct visualization, in surgical procedures, including minimally invasive cardiac surgery procedures. The probes ablate the target tissue by creating an inflammatory response, or thermal necrosis.

Device Description

The Guidant Microwave Ablation System consists of a microwave generator and handheld ablation probe accessories. The probe is available in two versions: the FLEX 4 and the FLEX 10. The ablation probe contains the microwave antenna that emits the microwave energy.

The microwave generator's output (2450 MHz) is conducted through the output cable, into the cabling of the Probe, and out the antenna at the distal section of the Probe. Energy is expressed in a pattern that is radial to the orientation of the ablating tip. Shielding in the ablating tip inhibits microwave energy expression into non-targeted tissue. The target tissue contains polar molecules (most notably water), which vibrate in response to the induced electromagnetic microwave field. This vibration creates heat through friction, raising the temperature of the tissue throughout the area being ablated. Upon reaching a certain temperature, the tissue becomes necrotic, and thus fully ablated.

FLEX 4 has a flexible antenna fixed at the distal end of the probe. FLEX 10 has a flexible antenna that can be moved along the distal end of the probe.

AI/ML Overview

This document is a 510(k) premarket notification for the Guidant Microwave Ablation System. It primarily addresses a labeling change to refine the indication statement for the device. The document explicitly states that no new testing was performed for this specific 510(k) submission (K041340) because the product's design, technology, materials, manufacturing, performance, specifications, and method of use were unchanged from previous submissions (K003978 and K013946).

Therefore, based on the provided text, it's not possible to provide the detailed information requested regarding new acceptance criteria or a new study proving the device meets those criteria, as no new study was conducted for this submission. The document relies on the substantial equivalence to previously cleared devices and studies.

However, I can extract the information available from the document regarding the device and its regulatory status:

1. Table of Acceptance Criteria and Reported Device Performance:

Based on this 510(k), no new acceptance criteria or specific performance data are reported as this submission is for a labeling change and relies on previous clearances. The document implies that the device's performance, as established in prior 510(k)s (K003978 and K013946), meets the necessary standards, but those specific criteria and performance metrics are not detailed here.

2. Sample size used for the test set and the data provenance:

Sample Size for Test Set: Not applicable as no new testing was performed for this submission. The previous 510(k)s (K003978, K013946) would contain this information.
Data Provenance: Not applicable for new data in this submission.

3. Number of experts used to establish the ground truth for the test set and the qualifications of those experts:

Not applicable as no new testing was performed for this submission.

4. Adjudication method for the test set:

Not applicable as no new testing was performed for this submission.

5. If a multi reader multi case (MRMC) comparative effectiveness study was done, If so, what was the effect size of how much human readers improve with AI vs without AI assistance:

No MRMC study was done, nor is AI involved. This device is a microwave ablation system, not an AI-powered diagnostic or assistive technology.

6. If a standalone (i.e. algorithm only without human-in-the loop performance) was done:

Not applicable. This is a medical device for direct surgical use, not a standalone algorithm.

7. The type of ground truth used:

Not applicable as no new testing was performed for this submission.

8. The sample size for the training set:

Not applicable.

9. How the ground truth for the training set was established:

Not applicable.

Summary of Device and Regulatory Context (Based on the document):

Device Name: The Guidant Microwave Ablation System
Intended Use: Surgical ablation of soft tissue, and striated, cardiac, and smooth muscles, under direct visualization, including minimally invasive cardiac surgery procedures. The probes ablate target tissue by creating an inflammatory response or thermal necrosis.
Mechanism of Action: Emits 2450 MHz microwave energy. This energy causes polar molecules (like water) in the tissue to vibrate, creating heat through friction. This raises the tissue temperature to a necrotic level, leading to ablation.
Regulatory Status: Cleared via 510(k) (K041340) as substantially equivalent to predicate devices (AFx Microwave Ablation System and Accessories K003978, FLEX 10 Accessory K013946, CryoGen Cardiac Cryosurgery System K974320, Heartport™ Maze System: Cryoprobe Set K970496).
Key Point of K041340: This specific submission is primarily a labeling change to update the product name and make the indication statement more precise and consistent with predicate devices, particularly regarding surgical access. No changes were made to the device's design, technology, materials, manufacturing, performance, or method of use. Therefore, no new testing was deemed necessary.

Summary

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Public Health Service

Image /page/0/Picture/2 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo is a circular seal with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" around the perimeter. Inside the circle is a stylized image of a caduceus, which is a symbol of medicine, with a human profile incorporated into the design.

MAR 1 1 2008

Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850

Guidant Cardiac Surgery c/o Mr. Eric Henning Project Leader KEMA Quality B.V. 4377 County Line Road Chalfont, PA 18914

Re: Re: K041340 Trade/Device Name: The Guidant Microwave Ablation System Regulation Number: 21 CFR 878.4400 Regulation Name: Electrosurgical cutting and coagulation device and accessories Regulatory Class: II (two) Product Code: OCL, NEY Dated: July 9, 2004 Received: July 13, 2004

Dear Mr. Henning:

This letter corrects our substantially equivalent letter of July 28, 2004.

We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments or to devices that have been reclassified in accordance with the provisions of the Federal Food. Drug, and Cosmetic Act (Act) that do not require approval of a premarket approval (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.

If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.

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Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); good manufacturing practice requirements as set forth in the quality systems (OS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (sections 531-542 of the Act); 21 CFR 1000-1050.

This letter will allow you to continue marketing your device as described in your Section 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.

If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please contact the Office of Compliance at (240) 276-0120. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). You may obtain other general information on your responsibilities under the Act from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (240) 276-3150 or at its Internet address http://www.fda.gov/cdrh/dsma/dsmamain.html

Sincerely yours,

Bram D. Zuckerman, M.D. Director Division of Cardiovascular Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

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Guidant Microwave Ablation System Premarket Notification 510(k)

INDICATIONS FOR USE STATEMENT

510(k) Number (if known):

041 34-0

Device Name: The Guidant Microwave Ablation System

Indications for Use

Prescription Usc (Per 21 CFR 801.109)

Over-the-Counter Use (Optional Format 1-2-96)

(PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED.)

Concurrence of CDRH, Office of Device Evaluation (ODE)
--------------------------------------------------------

	Miriam C. Provost
	(Division Sign-Off)
	Division of General, Restorative,
	and Neurological Devices

5100k) Number

Page 1-5

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K041340

SECTION 2 - 510(k) SUMMARY OF SAFETY AND EFFECTIVENESS

This summary of 510(k) safety and effectiveness information is being submitted in accordance with the requirements of SMDA 1990 and 21 CFR 807.92

Contact Person	Alternate Contact Person
Nancy Gallo	Erin Mazzone
Consultant to the Guidant Corporation	Manager of Regulatory AffairsGuidant Corporation
(408) 845-2006 phone	(408) 845-2060 phone
(408) 845-1855 fax	(408) 845-1855 fax

Device Name Trade Name: Guidant Microwave Ablation System Common Name: Microwave Ablation System Classification Name: Cryosurgical unit and accessories (21 CFR 878,4350):

Identification of Predicate Devices

AFx Microwave Ablation System and Accessories	K003978
FLEX 10 Accessory for the AFx Microwave Ablation System	K013946
CryoGen Cardiac Cryosurgery System	K974320
Heartport™ Maze System: Cryoprobe Set	K970496

Indications for Use

Device Description

FLEX 4 has a flexible antenna fixed at the distal end of the probe. FLEX 10 has a flexible antenna that can be moved along the distal end of the probe.

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Page 2 of (2)

Guidant Microwave Ablation System Premarket Notification 510(k)

Testing in Support of Substantial Equivalence Determination

There are no changes in the product's design, technology, materials, manufacturing, performance, specifications, and method of use or the instructions for use (except for the updated product name and indication statement).

The proposed change is a labeling change to make the product's indication statement more precise and consistent with those of the predicate devices with respect to the surgical access to the tissue. This change has no impact on the target population for the device.

In view of the above, the testing conducted and included previously in the 510(K) submissions K003978 and K013946 remains valid and sufficient, in the opinion of the sponsor, and consequently no additional testing was necessary for the substantial equivalence determination.

Substantial Equivalence Conclusion

The subject Guidant Microwave Ablation System has been on the market as the AFx Microwave Ablation System (K003978 and K013946).

There are no changes in the product's design, technology, materials, manufacturing, performance, specifications, and method of use or instructions for use (except for the updated product name and indication statement).

The primary change is a labeling change to make the product's indication statement more. precise and consistent with those of the predicate devices with respect to the surgical access to the target tissue. This change has no impact on the target population for the device.

The Guidant Microwave Ablation System and the predicates are widely used by cardiothoracic surgeons via a variety of surgical approaches, including minimally invasive approaches, to access and ablate the target tissue. For all these devices, the method of use is similar in that the surgeon uses a clinically appropriate surgical access to reach the target tissue and to lightly position the device on it. The physical characteristics of the subject device with respect to the surgical access and the use are similar to those of the predicates and do not create any new issues of safety and efficacy.

In view of the above, the subject device is judged substantially equivalent to the predicate devices.

Regulation Number and Section

§ 878.4400 Electrosurgical cutting and coagulation device and accessories.

(a)
Identification. An electrosurgical cutting and coagulation device and accessories is a device intended to remove tissue and control bleeding by use of high-frequency electrical current.(b)
Classification. Class II.