BETTER-BLADDER (BB)

K981284 · Circulatory Technology, Inc. · DTN · Aug 12, 1998 · Cardiovascular

Device Facts

• Record ID: K981284
• Device Name: BETTER-BLADDER (BB)
• Applicant: Circulatory Technology, Inc.
• Product Code: DTN · Cardiovascular
• Decision Date: Aug 12, 1998
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 870.4400
• Device Class: Class 2

Intended Use

The Better-Bladder™ is a device that isolates pressure transducers from blood contact when measurements of blood pressure in extracorporeal circuits are made during short and long term procedures. The pressure signal can be used to control pump speed. It is also used as an inline reservoir to provide compliance in the circuit during short and long term procedures.

Device Story

Better-Bladder™ (BB) is a flow-through extracorporeal circuit component; functions as pressure transducer isolator and inline blood reservoir. Device consists of unitary length of medical-grade PVC tubing with enlarged, thin-walled section housed in PETG; design eliminates physical/chemical discontinuities found in traditional bladders. Operates by sensing pressure differences across thin-walled section; provides pressure signal for pump speed control. Used in clinical settings (e.g., perfusion circuits) by clinicians. Unlike predicate bladders requiring horizontal placement, BB allows vertical orientation for gravitational washout, reducing stasis/thrombosis risk. Flow-through design prevents stagnation common in dead-ended pressure lines. Adjustable compliance reduces pressure oscillations from roller pumps. Enables shorter venous tubing, reducing prime volume and foreign surface exposure. Output is pressure signal used by external monitor to control pump speed.

Clinical Evidence

Bench testing only. Evaluated pressure measurement accuracy against invasive methods; demonstrated equivalence. Tested structural integrity with internal pressures up to 1500 mmHg (3x max clinical pressure) and housing pressure of 900 mmHg (1.8x max clinical pressure) without failure. No clinical data provided.

Technological Characteristics

Materials: Medical grade PVC (blood path, ISO 10993 compliant), PETG (housing). Design: Unitary extruded tubing with enlarged thin-walled section; flow-through configuration. Dimensions: Not specified. Energy: Passive (mechanical pressure sensing). Connectivity: Standalone component in extracorporeal circuit. Sterilization: Not specified (refers to K964337).

Indications for Use

Indicated for use in extracorporeal circuits during short or long-term procedures to isolate pressure transducers from blood contact, provide an inline blood reservoir, and facilitate pressure-based pump speed control.

Regulatory Classification

Identification

A cardiopulmonary bypass blood reservoir is a device used in conjunction with short-term extracorporeal circulation devices to hold a reserve supply of blood in the bypass circulation.

Special Controls

*Classification.* Class II (special controls), except that a reservoir that contains a defoamer or filter is classified into the same class as the defoamer or filter. The device, when it is a cardiopulmonary bypass blood reservoir that does not contain defoamers or blood filters, is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 870.9.

Predicate Devices

• Pressure Monitoring Separator Chamber (PMS-2) (Quest Medical)
• R30 Assist Reservoir (SciMed Surgical/AVECOR Cardiovascular)

Reference Devices

• Avecor Model # DL1414 (perfusion connector)

Submission Summary (Full Text)

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K981/284

#### SAFETY AND EFFECTIVENESS

### 510(k) Summary

Once a substantial equivalence determination is made, a 510(k) summary providing information on the safety and effectiveness of the Better-Bladder™ will be provided upon the request of any person. The 510(k) summary is included in Attachment 5.

### Functional Testing

With respect to this notification, the Better-Bladder™ was functionally evaluated in a series of bench tests. The test protocols, experimental data, and analyses are provided as Attachment 6. These tests and the data obtained demonstrate that the pressure measured noninvasively with the BB is equivalent to that measured invasively, and that the BB shows comparable or superior performance to the predicate devices.

General Safety See K964337.

See K964337.

Sterilization, Sterilant Residuals, Pyrogenicity See K964337.

Biocompatibility See K964337.

Quality Assurance See K964337.

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## SUBSTANTIAL EQUIVALENCE

### Predicate Devices

The Better-Bladder™ is substantially equivalent to the following devices:

#### Company Name

Quest Medical (formerly Delta Medical Industries) SciMed Surgical (now AVECOR Cardiovascular)

Product Name (Model) Pressure Monitoring Separator Chamber (PMS-2) R30 Assist Reservoir

These devices are currently available cardiovascular and/or dialysis devices that have been determined to be substantially equivalent to devices in commercial distribution prior to May 28, 1976.

### Same Intended Use

## The Better-Bladder™

The Better-Bladder™ (BB) has two intended uses:

- To isolate pressure transducers from blood contact when measurements of blood pressure in extracorporeal 1. circuits are made during short or long term procedures.
- As an inline blood reservoir. such as the bladders used to sense decreasing pump inlet pressure. The pressure 2. signal can be used to control pump speed during short or long term procedures.

## Predicate Devices

The Quest Pressure Monitoring Separator Chamber is intended to help in the monitoring of arterial pressure by providing an air-liquid phase separator (same as BB use 1).

The R30 Assist Reservoir is intended to hold a reserve supply of blood in the perfusion circuit and is designed to sense venous return pressure during ECMO procedures (same as BB use 2). It incorporates two vent tubes at the top for air aspiration or drug infusion.

### Technological Characteristics

The technological characteristics of the BB do not affectiveness. The equivalency of the blood contacting portion of the BB with respect to a) material, b) design, c) general manufacturing methods, and d) use in an extracorporeal circuit is discussed below.

Material. The blood of the patient is only exposed to the inner surface of the tubing forming the BB. The a) blood path of the BB consists of a medical grade tubing extruded from a polyvinyl chloride formulation that has passed biocompatibility tests in accordance with ISO 10993 Part-1 Biological Evaluation of Medical Devices.

b) Design. The BB consists of a unitary length of tubing, a section of which has been processed to form an enlarged diameter with a thinner wall. The enlarged section is very responsive to pressure differences across its thin wall. Because the entire device is made from a single length of smooth perfusion tubing, there are no connections between the thinker wall tubing portions. This unique design eliminates both physical and material (chemical) discontinuities. The thin walled section in its housing can withstand over 1500 mmHg (three times the maximum pressure expected under worst-case clinical conditions). The BB does not incorporate vent tubes for air aspiration or drug infusion. These can be added by placing a perfusion connector with a dual Luer fitting (e.g. Avecor Model # DL1414) at the inlet to the BB, see Fig. 7b.

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c) General Manufacturing. The blood path of the BB is an extruded tube, part of which is formed in a

secondary operation. The Housing of the BB, made of PETG, does not contact the patient and therefore its physical characteristics, rather then its blood compatibility, are important. Each BB is individually tested to an internal pressure as well as a Housing pressure of 900 mmHg, which is 1.8 times the maximum clinically expected pressure and also significantly higher than the maximum operating pressures recommended for many devices in the extracorporeal circuit. Tests have also been conducted where a pressure of 1500 mmHg was applied internally to the BB without any failure.

The thin walled section of the unitary tubing forming the BB is sealed within the Housing by forming a bond between the outside of the unitary tubing and the inside of the Housing. The bonding is external to the blood path and therefore does not pose any blood compatibility concerns.

d) Use in an extracorporeal circuit. Most extracorporeal circuits monitor pump inlet and/or pump outlet pressures, but typically with "dead-ended" pressure lines. Since the BB is a flow-through device, stagnation is eliminated and the likelihood of thrombosis is decreased. The predicate bladders must be positioned horizontally, and are thereby susceptible to stasis and blood cell accumulation at the bottom of the device (see Fig. 7A), which can contribute to thrombus formation.

# HOW THE BETTER-BLADDER™ ENHANCES SAFETY AND EFFECTIVENESS

- 1. The bubble in the tube is formed such that its internal surface is continuous and fissureless, thereby eliminating chemical or physical discontinuities, factors that can increase thrombus formation.
- In terms of bladders, the predicate bladders must be positioned horizontally, and are thereby susceptible to 2. stasis and blood cell accumulation at the bottom of the device, both of which can contribute to thrombus formation. The BB can be placed vertically, thus providing gravitational washout that significantly reduces stasis or accumulation of red cells (see Fig. 7).
- 3. The BB can provide adjustable compliance that reduces pressure oscillations due to pumping action of the roller pump.
- 4. The predicate bladder must be placed on the floor to achieve appropriate gravitational flow. The BB, however, can be placed much closer to the patient with the loss of "gravity" drainage compensated by applying slight negative pressure to the housing. This allows for shorter venous tubing which reduces the prime volume, the foreign surface exposed to blood as well as the of the blood to the surface. The shorter circuit and smaller surface area also reduces heat loss of the blood in the extracorporeal circuit.
- 5. In terms of pressure isolators, the BB is a flow-through device, reducing the chance of clotting. The predicate devices can pose greater risk of clotting because there is NO flow in the pressure line connecting the blood path to the isolator.
- 6. If the BB is used to obtain a pressure signal to control the pressure at which the purnp would turn off is easily adjustable via the pressure monitor. The predicate bladder relies on a mechanical switch and is not adjustable.

Image /page/2/Figure/13 description: The image shows two diagrams, labeled A and B, illustrating flow conditions with predicate devices. Diagram A shows a silicone bladder with blood inside, and the text indicates that blood cells settle in this configuration. Diagram B depicts a perfusion connector with two stopcocks, and the text indicates that blood cells wash through in this setup. The diagrams are part of Figure 7 and reference 'The Better-Bladder™'.

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Image /page/3/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo consists of a circular seal with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES · USA" around the perimeter. Inside the circle is an abstract image of an eagle or other bird-like figure with three stylized lines representing its wings or feathers.

Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850

AUG 1 2 1998

Mr. Yehuda Tamari President Circulatory Technology, Inc. 21 Singworth Street Oyster Bay, NY 11771

K981284 Re: "Better-Bladder™" Requlatory Class: II Product Code: DTN Dated: May 13, 1998 Received: May 14, 1998

Dear Mr. Tamari:

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 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, Druq, 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, qood 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 requlations affecting your device can be found in the Code of Federal Requlations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the Current Good Manufacturing Practice requirements, as set forth in the Quality System Regulation (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 requlatory 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 obliqation 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 requlations.

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#### Paqe 2 - Mr. Yehuda Tamari

This letter will allow you to begin marketing your device as described in your 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 Ehus, 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 [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 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 [phone] or [phone] or at its internet address "http://www.fda.gov/cdrh/dsma/dsmamain.html."

Sincerely yours,

Thomas J. Callahan

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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Attachment 10 Better-Bladder™ Indications for Use

510(k) Number Device Name:

K98 1284-

Better-Bladder тм

The Better-Bladder™ is a device that isolates pressure transducers from blood contact Indications for Use: when measurements of blood pressure in extracorporeal circuits are made during short and long term procedures. The pressure signal can be used to control pump speed. It is also used as an inline reservoir to provide compliance in the circuit during short and long term procedures.

981284

(Division Sign-Off) Division of Cardiovascular, Respiratory, and Neurological Devices 510(k) Number_

age 1

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