MATRIX STRETCH RESISTANT DETACHABLE COIL

K031168 · Boston Scientific, Target · HCG · May 14, 2003 · Neurology

Device Facts

• Record ID: K031168
• Device Name: MATRIX STRETCH RESISTANT DETACHABLE COIL
• Applicant: Boston Scientific, Target
• Product Code: HCG · Neurology
• Decision Date: May 14, 2003
• Decision: SESE
• Submission Type: Special
• Regulation: 21 CFR 882.5950
• Device Class: Class 2
• Attributes: Therapeutic

Intended Use

Matrix Detachable Coils are intended for embolization of those intracranial aneurysms that - because of their morphology, their location, or the patient's general medical condition - are considered by the treating neurosurgical team to be a) very high risk for management by traditional operative techniques, or b) inoperable. Matrix Detachable Coils are also intended for embolization of other neuro vascular abnormalities such as arteriovenous malformations and arteriovenous fistulae. The Matrix Detachable Coils are also intended for arterial and venous embolizations in the peripheral vasculature.

Device Story

Matrix Stretch Resistant Detachable Coils are platinum-tungsten alloy coils coated with biocompatible absorbable polymer; used for embolization of intracranial aneurysms and neurovascular abnormalities. Device delivered via catheter; detachment triggered by electrolytic dissolution of delivery wire using GDC Power Supply. Power supply applies constant current; detects detachment via resistance changes; signals completion with audible beeps. Used in clinical settings by neurosurgeons/interventionalists under fluoroscopic guidance. System includes power supply, delivery wire, connecting cables, and patient return electrode. Electrolytic reaction dissolves wire at detachment zone; allows precise coil placement. Benefits include reduced risk of coil migration/stretching; improved clinical outcomes for high-risk/inoperable aneurysm patients.

Clinical Evidence

Bench testing only. No clinical data presented. Verification testing included friction, deployment/retraction, catheter compatibility, bond integrity, conductivity, tensile strength, stiffness, particulate analysis, and detachment time. All tests met pre-defined acceptance criteria.

Technological Characteristics

Platinum-tungsten alloy coil with biocompatible absorbable polymer coating. Electrolytic detachment principle. Powered by 9V battery-operated GDC Power Supply. Connectivity: wired system (cables, patient return electrode). Dimensions: primary/secondary coil OD and wire OD within predicate ranges. Sterilization: not specified. Software: embedded firmware for current control and detachment detection.

Indications for Use

Indicated for patients with intracranial aneurysms deemed high-risk or inoperable by neurosurgical teams, neurovascular abnormalities (arteriovenous malformations, arteriovenous fistulae), and arterial/venous embolizations in peripheral vasculature.

Regulatory Classification

Identification

A neurovascular embolization device is an intravascular implant intended to permanently occlude blood flow to cerebral aneurysms and cerebral ateriovenous malformations. This does not include cyanoacrylates and other embolic agents, which act by polymerization or precipitation. Embolization devices used in other vascular applications are also not included in this classification, see § 870.3300.

Special Controls

*Classification.* Class II (special controls.) The special control for this device is the FDA guidance document entitled “Class II Special Controls Guidance Document: Vascular and Neurovascular Embolization Devices.” For availability of this guidance document, see § 882.1(e).

Predicate Devices

• Matrix Detachable Coil (K012985)
• GDC Stretch Resistant Detachable Coils (K030475)

Submission Summary (Full Text)

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# MAY 1 4 2003

Image /page/0/Picture/1 description: The image shows a handwritten string of characters, "K031168". The characters are written in a cursive style, with some connections between the numbers. The numbers are all distinct and legible.

### Special 510(k): Matrix Stretch Resistant Coils (Matrix Standard-SR 2D, Matrix Soft-SR, Matrix Soft-SR 2D and Matrix UltraSoft-SR)

a. 510(k) Summary

Contact Person

Jim Leathley Regulatory Affairs Project Manager Boston Scientific Target 47900 Bayside Parkway Fremont, CA. 94538

Trade Name

Matrix™ Stretch Resistant Detachable Coils

Common Name

Occlusion Coil

Classification Name

Artificial Embolization Device (21 CFR Section 882,5950)

Prodicato Devices

| Number | Description | Predicate for | Clearance Date |
|-----------------------------------|-------------------------------------------|-----------------------------------------------------------------------|-----------------|
| K012985<br>(Boston<br>Scientific) | Matrix Detachable Coil | Matrix Stretch Resistant<br>Detachable Coils | 31 January 2003 |
| K030475<br>(Boston<br>Scientific) | GDC Stretch Resistant<br>Detachable Coils | Stretch Resistant feature of<br>the Matrix Stretch<br>Resistant Coils | 14 March 2003 |

#### Intended Use

Matrix Detachable Coils are intended for embolization of those intracranial aneurysms that - because of their morphology, their location, or the patient's general medical condition - are considered by the treating neurosurgical team to be a) very high risk for management by traditional operative techniques, or o) inoperable. Matrix Detachable Coils are also intended for embolization of other neuro vascular abnormalities such as arteriovenous malformations and arteriovenous fistulae. The Matrix Detachable Coils are also intended for arterial and venous ambolizations in the perioheral vasculature.

Boscon Scientific

Page 77

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### Device Description

Matrix Stretch Resistant Detachable Coils are comprised of a platinum-tungsten alloy coil which is coated with a biocompatible absorbable polymer.

Packaging of the device is identical to that of the predicate Matrix Detachable Coils: the finished device is loaded into an introducer sheath and is then placed in a dispenser coil contained within a foil pouch. The foil pouch is then placed into a cardboard display box with a copy of the instructions for use.

Matrix Stretch Resistant Detachable Coils are detached using Boston Scientific's GDC® Power Supply. The system consists of the power supply, powered by two 9 volt batteries, an occlusion coil attached to a delivery wire, a set of connecting cables and a patient return electrode. A positive cable (red) supplies current to the delivery wire while a negative cable (black) completes the circuit by connecting to the patient return electrode (either an adhesive patch attached to the patient's skin or a hypodermic needle inserted subcutaneously through the patient's skin). After placement of the coil in the anatomy, detachment occurs through the clectrolytic dissolving of a small portion of the delivery wire.

### Principles of Cperation

Detachment of the occlusion coil from the delivery wire is accomplished by means of an electrolytic reaction in which the anode, or positive, electrode is the GDC stainless-steel delivery wire, and the cathode, or negative, electrode is a patient return clectrode. The body's electrolytes serve as the electrolytic carrier between the two electrodes. Since body fluids are relatively jonic, these fluids serve as good conductors for the minimal electric current generated by the GDC power supply. The GDC is designed so that electrolytic dissolution occurs only in the detachment zone.

Once the power supply circuitry detects coil detachment, the unit will emit 5 audible beeps signaling detachment. In addition, current flow will be stopped and all displays will freeze, indicating values at the time of detachment. This is the "pause" mode, designed to allow the clinician, utilizing fluoroscopy, to confirm that the coil has detached.

If the system has incorrectly signaled coil detachment, the current flow can be re-started by pressing the "Current" switch on the power supply. Restarting the current does not reset the elapsed time display on the power supply.

### GDC® Power Supply Description

The GDC Power Supply is a battery-operated, self-contained unit designed to initiate and control the electrolytic detachment of a GDC coil inside an aneurysm.

Each time the GDC Power Supply is turned on, the unit defaults to the 1.0 mA current setting. Pressing the "Current" switch one time changes the setting to the 0.5 mA current setting; pressing a second time changes the setting to 0.75 mA; pressing a third time returns the unit to the default 1.0 mA setting. Each time the switch is pressed, the current display flashes the new current setting.

Bos ton Scientific

Page 78

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The GDC Power Supply is designed to apply a constant current through the GDC System and to detect when coil detachment has occurred. It maintains a constant current by:

- 1) sensing the amount of resistance to current flow through the GDC System, and
- 2) adjusting the voltage needed to maintain the desired current setting. It is also designed to identify subtle changes in the way current is flowing through the GDC System and to recognize those changes which indicate detachment.

Once those patterns are identified, the GDC Power Supply signals detachment and stops the flow of current through the GDC System.

### Accessories Description

Accessories consist of the following:

- · Two connecting cables, one black (274 cm long), the other red (152 cm long)
- · Two standard 9 volt alkaline batteries

Boston Scientific

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# Technological Characteristics Comparison

# Coil Dimensional Attributes (compared to the predicate device)

| | Matrix™ Stretch Resistant Detachable Coil |
|--------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------|
| Coil Primary Wind OD | Within the range used for the predicate devices. |
| Secondary Coil OD | Within the range used for the predicate devices. |
| Coil Wire OD | Within the range used for the predicate devices. |
| Delivery Wire Length | Same as predicate device. |
| Delivery Wire Proximal OD | Same as predicate device. |
| Delivery Wire Distal OD | Within the range used for the predicate devices. |
| | Matrix™ Stretch Resistant Detachable Coils |
| Main Coil | Same as predicate device |
| Polymer coating | Same as predicate device |
| Stretch Resistant Thread and anchor chain | Same as predicate device for all except Matrix<br>Standard-SR 2D. Anchor Chain for Matrix<br>Standard-SR 2D utilizes new wire size<br>(0.00125"). |
| Main Coil / delivery wire junction tubing | Same as predicate device |
| Adhesive | Same as predicate device |
| Delivery Wire | |
| Core wire w/coating | Same as predicate device |
| Proximal Coil | Same as predicate device |
| Proximal Marker Coil | Same as predicate device |
| Sheath, Delivery Wire (heat shrink tubing) | Same as predicate device |
| Proximal Tubing | Same as predicate device |
| Bushing | Same as predicate device |
| Inner Coil | Same as predicate device |

Boston Scientific

:

Page 80

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# Special 510(k): Matrix Stretch Resistant Coils (Matrix Standard-SR 2D, Matrix Soft-SR, Matrix Sofi -SR 2D and Matrix UltraSoft-SR)

# Technological Characteristics Comparison (cont.)

# Materials

Boston Scientific

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# Special 510(k): Matrix Stretch Resistant Coils (Matrix Standard-SR 2D, Matrix Soft-SR 2D and Matrix UltraSoft-SR)

| Test or Point of Comparison | Matrix™ Stretch Resistant Detachable Coil |
|------------------------------------------------|----------------------------------------------------------|
| Friction | Meets acceptance criteria. |
| Deployment / Retraction | Meets acceptance criteria. |
| Catheter Coil Compatibility | Meets acceptance criteria. |
| Coil Bond Integrity | Meets acceptance criteria. |
| Suture-to-Coil Bond Integrity | Meets acceptance criteria. |
| Main Coil Conductivity | Meets acceptance criteria. |
| Tensile Strength: main coil-to-<br>pusher wire | Meets acceptance criteria. |
| Tensile Strength: stretch resistant<br>suture | Meets acceptance criteria. |
| Tensile Strength: distal tip ball | Meets acceptance criteria. |
| Proximal Coil Stiffness | Meets acceptance criteria. |
| Acute Particulate | Meets acceptance criteria. |
| Dynamic Particulate | Meets acceptance criteria. |
| Suture Degradation | Meets acceptance criteria. |
| Coil Stiffness | Meets acceptance criteria. |
| Secondary Coil OD Shape<br>Retention | Meets acceptance criteria. |
| Detachment Time | Modification has no affect upon detachment time |
| Inner Coil Weld Strength | Modification has no affect upon inner coil weld strength |
| Coil Migration | Modification has no affect upon coil migration |

# Verification Test Summary Table: Matrix Stretch Resistant Devices vs Predicate Matrix™ Devices

Boston Scientific

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# Special 510(k): Matrix Stretch Resistant Coils (Matrix Standard-SR 2D, Matrix Soft-SR, Matrix Soft-SR 2D and Matrix UltraSoft-SR)

# Verification Test Summary Table (cont.): Matrix Stretch Resistant Devices vs Predicate Matrix™ Devices

Bo: ton Scientific

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Image /page/7/Picture/1 description: The image is a black and white logo for the Department of Health & Human Services - USA. The logo is circular, with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" arranged around the top half of the circle. Inside the circle is a stylized image of three wavy lines that resemble a human profile.

Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850

MAY 1 4 2003

Mr. Jim Leathley Regulatory Affairs Project Manager Boston Scientific Target 47900 Bayside Parkway Fremont, California 94538

Re: K031168

Trade/Device Name: Matrix™ Stretch Resistant Detachable Coils Regulation Number: 21 CFR 882.5950 Regulation Name: Artificial embolization device Regulatory Class: III Product Code: HCG Dated: April 11, 2003 Received: April 14, 2003

Dear Mr. Leathley:

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 application (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 such 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.

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 (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.

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Page 2 - Mr. Jim Leathley

This letter will allow you to begin 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 [phone]. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at [phone]. 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 may be obtained from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number [phone] or [phone] or at its Internet address http://www.fda.gov/cdrh/dsma/dsmamain.html

Sincerely yours,

Miriam C. Provost

Celia M. Witten, Ph.D., M.D. Director Division of General, Restorative and Neurological Devices Office of Device Evaluation Center for Devices and Radiological Health

Enclosure

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K031168

Special 510(k): Matrix Stretch Resistant Coils (Matrix Standard-SR 2D, Matrix Soft-SR, Matrix Soft-SR 2D and Matrix UltraSoft-SR)

#### INDICATIONS FOR USE STATEMENT

510(k) Number:

Matrix Stretch Resistant Coils, comprising: Device Name:

> Matrix™ Standard-SR 2D Matrix Soft-SR Matrix Soft-SR 2D Matrix UltraSoft-SR

Indications for Use:

Matrix Detachable Coils are intended for embolization of those intracranial aneurysms that - because of their morphology, their location, or the patient's general medical condition - are considered by the treating neurosurgical team to be a) very high risk for management by traditional operative techniques, or b) inoperable. Matrix Detachable Coils are also intended for embolization of other neuro vascular abnormalities such as arteriovenous malformations and arteriovenous fistulae. The Matrix Detachable Coils are also intended for arterial and venous embolizations in the peripheral vasculature.

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

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

| Prescription Use (Per 21 CFR 801.109) | OR | Over The Counter Use |
|---------------------------------------|----|----------------------|
|---------------------------------------|----|----------------------|

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

| 510(k) Number | K031168 |
|---------------|---------|
|---------------|---------|

| Boston Scientific | April 2003 |
|-------------------|------------|
|-------------------|------------|

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