TherOx Infusion Guidewires are intended for use in facilitating the placement of interventional devices in the cardiovascular and neurovascular system. TherOx Infusion Guidewires are designed for small vessel use.

TherOx Infusion Guidewires are also intended to be used for the controlled selective infusion of physician-specified fluid agents before, during or after interventional procedures in the cardiovascular or neurovascular system.

TherOx Infusion Guidewires are not intended for delivery of contrast agents. Fluid agents utilized with TherOx Infusion Guidewires should be fully prepared and used according to their manufacturer's instructions for use.

Device Description

TherOx Infusion Guidewires are not intended for delivery of contrast agents. Filuid agents utilized with TherOx Infusion Guidewires should be fully prepared and used according to their manufacturer's instructions for use.

TherOx Infusion Guidewires are not intended for neonatal or pediatric use.

The TherOx Infusion Guidewire has an outside diameter of .014 in. and is available 180 cm and 300 cm in length, and is intended to pass freely thru standard catheters that have a thru lumen of 016 in. or larger.

The 300 cm TherOx Exchange Guidewire differs only in its overall length from the 180 cm TherOx Infusion Guidewire. The distal 180 cm of the TherOx Exchange Guidewire is identical to the 180 cm TherOx Infusion Guidewire. Only the proximal hypotube has been extended by 120 cm to achieve the 300 cm length. This extended proximal portion always remains outside the body and facilitates the replacement of one interventional device for another.

A proximal fluid connection is secured by connecting the proximal open end to a simple Tuohy-Borst connection. The infusion guidewire may be torqued by rotation of the torquing knob to direct the orientation of the distal tip.

AI/ML Overview

Here's a breakdown of the acceptance criteria and the study information for the TherOx Infusion Guidewires, based on the provided text:

Acceptance Criteria and Device Performance

The document does not explicitly present a table of acceptance criteria with corresponding performance metrics in a pass/fail format. Instead, it describes various tests performed and concludes that the device meets its functional specifications and is safe for its intended use, or performed comparably to predicate devices.

However, we can infer the acceptance criteria from the "Summary of Studies" section and present the reported performance against these implicit criteria:

Acceptance Criteria (Inferred)	Reported Device Performance
In Vitro Tests:
Functionality and Durability	Met or exceeded functional specification, safe for intended use.
Tensile Strength	Not explicitly detailed, but implied to meet functional specifications.
Guidewire Torque Response	Not explicitly detailed, but implied to meet functional specifications.
Tip Deflection and Strength	Not explicitly detailed, but implied to meet functional specifications.
Joint Integrity and Strength	Not explicitly detailed, but implied to meet functional specifications.
Handling Characteristics	Not explicitly detailed, but implied to meet functional specifications.
Fluid Infusion Characteristics	Not explicitly detailed, but implied to meet functional specifications.
Product Failure Modes	Not explicitly detailed, but implied to meet functional specifications.
Dimensional Conformance (Length, O.D., joint sizes, etc.)	All dimensions were within the design specifications.
Radiopacity	Demonstrated adequate radiopacity when compared with commercially available guidewires and vascular catheters.
Biocompatibility (for short-term vascular use, <24 hours tissue exposure)	Testing was completed and passed, adequately addressing toxicological safety.
In Vivo Tests:
Torque Characteristics	Performed comparable to commercially available guidewires.
Maneuverability	Performed comparable to commercially available guidewires.
Tip-shaping	Performed comparable to commercially available guidewires.
Radiopacity (in vivo)	Performed comparable to commercially available guidewires.
Compatibility with PTCA balloons and ancillary PTCA products	Demonstrated compatibility and performed comparable to commercially available guidewires.
Safety / Complications	No complications were observed.
Ability to advance into coronary arteries and small vessels	Could be advanced into the coronary arteries and small vessels with relative ease and no arteriographic or physiologic evidence of vascular trauma.
Clinical Study:
Performance as an accessory device	Performed comparably as an accessory device for commercially available interventional devices.

Study Details

Sample size used for the test set and the data provenance:
- In Vitro Tests: "Sample 2X sterilized (EtO) product" was used. This implies at least two samples for each test, but a specific number is not given for all tests. The data provenance is testing conducted in a laboratory setting ("bench testing").
- In Vivo Tests: 3 closed-chest dogs and 2 closed-chest pigs were used. This is prospective animal data.
- Clinical Study: No specific sample size is provided for the clinical study. The provenance is implied to be human clinical data, but details are absent.
Number of experts used to establish the ground truth for the test set and the qualifications of those experts:
- In Vitro Tests: No "experts" were explicitly mentioned for ground truth. Testing was based on "functional specification" and "design specifications."
- In Vivo Tests: "Investigators" concluded findings, but their number and specific qualifications (e.g., DVM, cardiologist) are not provided. They evaluated performance based on fluoroscopic visualization and observation of trauma.
- Clinical Study: No details are provided regarding experts, ground truth establishment, or qualifications.
Adjudication method for the test set:
- Not applicable as the reported studies primarily involved direct measurements, observations, and comparisons rather than expert consensus on a test set in the diagnostic AI sense.
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, an MRMC comparative effectiveness study was not done. This device is a guidewire, not an AI-powered diagnostic tool, so this type of study is not relevant. The comparisons were between the TherOx guidewire and commercially available guidewires (predicate devices).
If a standalone (i.e. algorithm only without human-in-the loop performance) was done:
- Not applicable. This is a medical device (guidewire), not an algorithm or AI system. Its performance is inherent to its physical properties and function.
The type of ground truth used (expert consensus, pathology, outcomes data, etc.):
- In Vitro Tests: Design specifications, functional specifications, and industry guidelines (FDA's PTCA Catheter System Testing Guideline, Tripartite Agreement on Biocompatibility, ISO 10993-1).
- In Vivo Tests: Direct observation of device performance, maneuverability, radiopacity, compatibility, and lack of adverse events (vascular trauma) by "investigators," likely using objective metrics and fluoroscopic visualization. Comparison against performance of commercially available guidewires served as a comparative ground truth.
- Clinical Study: The "comparable performance as an accessory device" implies clinical observations and potentially outcomes, but specific details on what "comparable" means or how it was measured are not provided.
The sample size for the training set:
- Not applicable. This is a physical medical device, not a machine learning model, so there is no "training set."
How the ground truth for the training set was established:
- Not applicable, as there is no training set for this device.

Summary

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510(k) SUMMARY

TherOx. Inc. 2025 Newport Blvd., Suite 200 Costa Mesa, CA 92627 Phone: (714) 645-4271 Fax: (714) 645-0208

NOV - 3 1997

Contact Paul Zalesky, Ph.D. Chief Operating Officer

Classification

Wire, Guide Percutaneous Catheter

DESCRIPTION

TherOx Infusion Guidewires are not intended for neonatal or pediatric use.

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TECHNOLOGICAL CHARACTERISTICS

This product is equivalent in intended use as well as design, composition and function to the legally marketed Advanced Cardiovascular Systems 0.014" Hi Torque Floppy Guidewire and Hi Torque Exchange Guidewire and the legally marketed MediTech Katzen Infusion Wire (K883880).

SUMMARY OF STUDIES

Performance Data

In Vitro Tests:

Sample 2X sterilized (EtO) product was tested in vitro to assess all aspects of functionality and durability, evaluating each of the product's components. The product performance was also evaluated under simulated in vivo conditions via an aorta test fixture with indwelling PTCA catheter (see schematics enclosed in Exhibit 2). All bench testing was accomplished in accordance with the FDA's PTCA Catheter System Testing Guideline (Feb., 1989). Performance analysis assessed tensile testing, guidewire torque response, tip deflection and strength, joint integrity and strength, handling characteristics, fluid infusion characteristics, and product failure modes. Test results indicate that the Infusion Wire meets or exceeds its functional specification and is safe for its intended use.

Complete Infusion Wires were fabricated and inspected for dimensional conformance with the product specification. Length and O.D. measurements were made for the stainless steel coil, platinum coil, coil-to-coil screw ioint, distal tip, core-to-hypotube joint, overall length, hypotube length and O.D., diffuser section, bond length and O.D., and polyimide-tohypotube joint length and O.D. All dimensions were within the design specifications.

RADIOPACITY

Radiopacity tests were performed during animal studies under fluoroscopic guidance. The TherOx Infusion Guidewire demonstrated adequate radiopacity when compared with commercially available guidewires and vascular catheters.

BIOCOMPATIBILITY OF TEST MATERIALS

Tests for biocompatibility of materials for the TherOx Infusion Guidewire were performed to establish that the materials used in the device met the qualifications for short-term use in the vascular system to comply with the standards set forth in the guidance documents in Tripartite Agreement on Biocompatibility and ISO 10993-1.

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In determining biocompatibility test design, testing was selected as deemed appropriate for the type of tissue/device interface and the duration of patient exposure.

Biocompatability testing was performed on sterile product.

TherOx feels that the biocompatibility test program used is appropriate and sufficient for a device that has less than 24 hours of tissue exposure.

TherOx feels the biocompatibility testing which was completed and passed, adequately addresses the issue of toxicological safety for this device's intended use.

In Vivo Tests

In vivo animal studies were performed on 3 closed-chest dogs and 2 closed-chest pigs at 3 research centers to assess torque characteristics, maneuverability, tip-shaping, radiopacity, and compatibility with PTCA balloons and ancillary PTCA products.

The guidewire was directed to the heart by passing it through a guide catheter. Selected branches of the left and right coronary arteries were investigated. All studies were performed under fluoroscopic visualization.

A total of four commercially available guide catheters with multiple-tip configurations were utilized. Commercially distributed PTCA catheters manufactured by two companies, and of varying dimensions, were utilized to demonstrate compatibility with the Ther Infusion Guidewire.

During the animal studies the TherOx Infusion Guidewire was tested against commercially available guidewires. The TherOx Infusion Guidewire performed comparable to commercially available guidewires when assessing maneuverability, compatibility, radiopacity and tip-shaping properties.

No complications were observed as a result of utilizing the TherOx Infusion Guidewire. The investigators concluded that the TherOx Infusion Guidewire could be advanced into the coronary arteries and small vessels. The TherOx Infusion Guidewire performed with relative ease and no arteriographic or physiologic evidence of vascular trauma was observed.

CLINICAL STUDY

Clinical studies demonstrated the TherOx Infusion Guidewire performed comparably as an accessory device, for commercially available interventional devices.

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Image /page/3/Picture/2 description: The image is a black and white seal for the Department of Health & Human Services - USA. The seal is circular, with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" arranged around the perimeter. In the center of the seal is a stylized image of three faces in profile, stacked on top of each other.

Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850

NOV - 3 1997

Paul J. Zalesky, Ph.D. TherOx, Inc. 2025 Newport Boulevard Costa Mesa, California 92627

K971719 Re : TherOx Infusion Guidewires Regulatory Class: II (two) Product Code: 74 DQX Dated: August 30, 1997 September 4, 1997 Received:

Dear Dr. Zalesky:

We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to 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). 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 (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the Current Good Manufacturing Practice requirement, as set forth in the Quality System Requlation (QS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic QS inspections, the Food and Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory action. In addition, FDA may publish further announcements concerning your device in the Federal Register. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 531 through 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.

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Page 2 - Paul J. Zalesky, Ph.D.

This letter will allow you to begin marketing your device as described in your 510(k) premarket notification. The FDA finding of substantial in your of (x) pror 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 and additionally 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4639. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its internet address "http://www.fda.gov/cdrh/dsmamain.html".

Sincerely yours,
Thomas J. Callehan

Thomas J. Callahan, Ph.D. Director Division of Cardiovascular, Respiratory, and Neurological Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

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510(k) Number: K971719

Device Name: TherOx Infusion Guidewires

Indications for Use:

TherOx Infusion Guidewires are not intended for neonatal or pediatric use.

Tua A. Rpp

(Division Sign-Off)

Division of Cardiovascular, Respiratory, co Neurological De 510(k) Number

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

Concurrence of DCRH, Office of Device Evaluation (ODE)

Prescription Use
(Per 21 CFR 801.109)

✓

Over the Counter Use

Regulation Number and Section

§ 870.1330 Catheter guide wire.

(a)
Identification. A catheter guide wire is a coiled wire that is designed to fit inside a percutaneous catheter for the purpose of directing the catheter through a blood vessel.(b)
Classification. Class II (special controls). The device, when it is a torque device that is manually operated, non-patient contacting, and intended to manipulate non-cerebral vascular guide wires, is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 870.9.