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Polycarbonate assists in balloon angioplasty.

Inflation devices molded with Lexan|R~ Healthcare Product (HP) polycarbonate resins simplify angioplasty balloon inflation, according to GE Plastics. During coronary and peripheral balloon angioplasty, the devices, made of Lexan HP1, are used for balloon inflation, balloon pressure monitoring, and balloon deflation.

The Angeflator from Angeion Medical Products, Minneapolis, activates automatically. There are no buttons or switches to operate as the device locks into positive pressure and vacuum modes. The transparent body of the disposable syringe, with a capacity of 20 cc, permits viewing of fluid and air bubbles for purging and catheter preparation.

The Medflator from Medex Inc., Hilliard, Ohio, offers digital readout of syringe pressure. Additionally, a module can display pressure in atmospheres or psi. The medflator also has a timer for length of inflation and a check system to ensure the display's accuracy. The disposable syringe's translucent blue-tinted housing allows viewing of fluid and air bubbles, and has a capacity of up to 24 cc.

Lexan resin reportedly has both the clarity and mechanical strength required for these applications. The 300 psi top pressure range of the Angeflator and the 440 psi top range of the Medflator are readily accommodated. High tensile strength protects the syringes when the plungers are screwed in. With the plunger in, pressure in the Angeflator increases to 20 atmospheres. The Medflator reaches inflation pressure with a one-third turn of the plunger, and has a maximum pressure of 30 atmospheres. The tensile strength of the resin ranges between 9000 and 10,000 psi.

Both devices offer advantages to cardiologists and radiologists during coronary and peripheral balloon angioplasty procedures. The Angeflator's low-friction plunger makes increasing pressure easier, and the pressure gage is angled and self-illuminating. The Medflator features a fluid-filled hydraulic pressure sensor and a mechanism to lock or unlock the thread while the balloon is inflated for quick deflation. A deflation alarm sounds and a light flashes on the Medflator when the inflation pressure drops below one atmosphere. The devices feature tubing longer than the 28 cm industry standard (35 cm and 38 cm, respectively), allowing greater distance from other equipment during an angioplasty procedure. The long tube length also lessens the chance that the catheter will become dislodged.

Special grades of the Lexan Healthcare Product resins are gamma radiation stabilized, and custom colors are available along with high mold-release options. The resins are suited for medical products requiring long flow lengths and thin wall sections, such as kidney dialysis tubes. GE Plastics, Inquiry Handling Service--PR #35-92, One Plastics Ave., Pittsfield, MA 01201; (800) 845-0600; Lexan: Circle 144. Angeion Medical Products, Director of Marketing, 13000 Highway 55, Minneapolis, MN 55441-3813; (612) 559-3370; Angeflator: Circle 145. Medex Inc., 3637 Lacon Rd., Hilliard, OH 43026; (614) 876-2413; Medflator: Circle 146.
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Publication:Plastics Engineering
Article Type:Product Announcement
Date:Sep 1, 1992
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