COBE CENTRYSYSTEM 600 HG HEMODIALYZERS

K960474 · Cobe Renal Care, Inc. · KDI · Aug 14, 1996 · Gastroenterology, Urology

Device Facts

• Record ID: K960474
• Device Name: COBE CENTRYSYSTEM 600 HG HEMODIALYZERS
• Applicant: Cobe Renal Care, Inc.
• Product Code: KDI · Gastroenterology, Urology
• Decision Date: Aug 14, 1996
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 876.5860
• Device Class: Class 2
• Attributes: Therapeutic

Intended Use

The Centrysystem 600 HG can be used whenever hemodialysis is indicated. This dialyzer can be used for long term chronic hemodialysis as well as for acute hemodialysis. In hemodialysis therapy, monitoring of patient vital signs, the dialysate delivery system, heparin administration, and clotting times should be performed under the direction of a physician.

Device Story

Cobe Centrysystem 600 HG is a high permeability hemodialyzer. It utilizes Hemophane hollow fibers (200-micron inner diameter, 6.5-micron wall thickness) to facilitate the removal of uremic toxins and waste products from patient blood. Blood flows through the inside of the hollow fibers while dialysate flows in a counter-current direction in the surrounding compartment. Solute removal occurs via diffusion and convection driven by transmembrane hydrostatic pressure. The device is used in clinical settings under physician supervision for chronic or acute hemodialysis. It functions as a passive filtration component within a larger dialysis delivery system.

Clinical Evidence

No clinical data. Bench testing only. In vitro testing evaluated blood/dialysate priming volumes, flow resistance, ultrafiltration coefficient, and clearance rates for urea, creatinine, phosphate, and vitamin B12 at varying flow rates, as well as residual blood volume.

Technological Characteristics

High permeability hemodialyzer. Materials: Hemophane hollow fiber membrane (Akzo/Enka), polycarbonate housing/header, polyurethane potting. Dimensions: 267 mm fiber length. Sterilization: Gamma irradiation. Energy source: None (passive). Connectivity: None.

Indications for Use

Indicated for patients requiring hemodialysis, including both long-term chronic and acute hemodialysis therapy.

Regulatory Classification

Identification

A high permeability hemodialysis system is a device intended for use as an artificial kidney system for the treatment of patients with renal failure, fluid overload, or toxemic conditions by performing such therapies as hemodialysis, hemofiltration, hemoconcentration, and hemodiafiltration. Using a hemodialyzer with a semipermeable membrane that is more permeable to water than the semipermeable membrane of the conventional hemodialysis system (§ 876.5820), the high permeability hemodialysis system removes toxins or excess fluid from the patient's blood using the principles of convection (via a high ultrafiltration rate) and/or diffusion (via a concentration gradient in dialysate). During treatment, blood is circulated from the patient through the hemodialyzer's blood compartment, while the dialysate solution flows countercurrent through the dialysate compartment. In this process, toxins and/or fluid are transferred across the membrane from the blood to the dialysate compartment. The hemodialysis delivery machine controls and monitors the parameters related to this processing, including the rate at which blood and dialysate are pumped through the system, and the rate at which fluid is removed from the patient. The high permeability hemodialysis system consists of the following devices:(1) The hemodialyzer consists of a semipermeable membrane with an in vitro ultrafiltration coefficient (K uf ) greater than 8 milliliters per hour per conventional millimeter of mercury, as measured with bovine or expired human blood, and is used with either an automated ultrafiltration controller or anther method of ultrafiltration control to prevent fluid imbalance.(2) The hemodialysis delivery machine is similar to the extracorporeal blood system and dialysate delivery system of the hemodialysis system and accessories (§ 876.5820), with the addition of an ultrafiltration controller and mechanisms that monitor and/or control such parameters as fluid balance, dialysate composition, and patient treatment parameters (e.g., blood pressure, hematocrit, urea, etc.). (3) The high permeability hemodialysis system accessories include, but are not limited to, tubing lines and various treatment related monitors (e.g., dialysate pH, blood pressure, hematocrit, and blood recirculation monitors).

Special Controls

*Classification.* Class II. The special controls for this device are FDA's:(1) “Use of International Standard ISO 10993 ‘Biological Evaluation of Medical Device—Part I: Evaluation and Testing,’ ” (2) “Guidance for the Content of 510(k)s for Conventional and High Permeability Hemodialyzers,” (3) “Guidance for Industry and CDRH Reviewers on the Content of Premarket Notifications for Hemodialysis Delivery Systems,” (4) “Guidance for the Content of Premarket Notifications for Water Purification Components and Systems for Hemodialysis,” and (5) “Guidance for Hemodialyzer Reuse Labeling.”

Predicate Devices

• Gambro GFS Plus 20 Hemodialyzer (K902481)

Submission Summary (Full Text)

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510K Notification: Cobe Centrysystem 600 HG
K960474
K960474

AUG 14 1996

# 510K(k) SUMMARY

SUBMITTER:
Gambro Healthcare
Formerly: Cobe Renal Care, Inc.
1185 Oak Street
Lakewood, CO 80215
[phone]

DATE PREPARED:
May 21, 1996

DEVICE NAME:
Cobe Centrysystem 600 HG

CLASSIFICATION NAMES:
High Permeability Hemodialyzer

PREDICATE DEVICE:
Gambro GFS Plus 20 Hemodialyzer

## Device Description:

The membrane used in this device is Hemophane which is substantially equivalent to the Hemophane membrane utilized in the Gambro GFS Plus 20 dialyzers which have been previously approved for marketing in the United States under a 510K Notification (K902481). Both of these membranes are manufactured by Akzo (Enka) of Germany.

Blood enters a blood inlet port where it is distributed to Hemophane hollow fibers. Each hollow fiber has an inner diameter of approximately 200 microns and a wall thickness of 6.5 microns. The effective length of the fibers is 267 mm. The fibers used in this device are substantially equivalent in design to the previously approved Gambro GFS Plus hemodialyzers. The patient's blood traverses the inside of the hollow fibers and exits the device via a blood exit port.

By means of a hydrostatic pressure or transmembrane pressure which is created by a combination of positive and negative pressures across the Hemophane membrane, plasma water along with certain lower molecular weight solutes of plasma water pass through the membrane and into the dialysate compartment of the devices. Removal of uremic toxins and waste products are removed from the patient's blood in this device by means of both diffusion and convection through the Hemophane membrane into the counter current flowing dialysis solution. The dialysate exits the devices via a dialysate outlet port.

## Predicate Devices:

The Cobe Centrysystem 600 HG hemodialyzers are substantially equivalent in construction, design, intended use, function and materials to other hemodialyzers currently marketed in the United States. Cobe Centrysystem 600 HG hemodialyzers are

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{1}

510K Notification: Cobe Centrysystem 600 HG
K960474

substantially equivalent in function, design, composition, materials, and operation, to the Gambro GFS Plus 20 Hemodialyzers (K902481) which are currently in commercial distribution in the United States.

## Intended Use:

The Centrysystem 600 HG can be used whenever hemodialysis is indicated. This dialyzer can be used for long term chronic hemodialysis as well as for acute hemodialysis. In hemodialysis therapy, monitoring of patient vital signs, the dialysate delivery system, heparin administration, and clotting times should be performed under the direction of a physician.

This indication statement is essentially the same as the indication statement for the predicate device.

## Technological Characteristics:

Comparing the proposed device to the predicate device, some similarities and differences are noted in the design employed to accomplish the same intended use. Both the proposed and predicate devices utilize the same Hemophane, hollow fiber membrane manufactured by ENKS / AKZO. Both the proposed and predicate devices utilize polycarbonate for the housing and header material and polyurethane for the membrane potting material. The predicate device is different from the proposed device in that it utilizes a larger membrane surface area, is ethylene oxide sterilized rather than gamma irradiated, and has a slightly larger blood side priming volume.

## Summary of Non-Clinical Tests:

In vitro testing was performed on the Centrysystem 600 HG to determine the following: blood side priming volume, dialysate side priming volume, dialysate and blood flow resistance, ultrafiltration coefficient, urea, creatinine, phosphate and vitamin B12 clearances at varying blood flows and residual blood volume. The results of these tests confirmed that the proposed device is substantially equivalent to the proposed device for these parameters.

## Clinical Test Results:

Clinical testing was not performed

## Conclusions:

Testing performed on the Cobe Centrysystem 600 HG indicates that it is safe, effective, and performs as well as the predicate device, when used in accordance with the instructions for use.

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