User Manual
28 Pages
Preview
Page 1
Ultra PC™ % Flowmeter User Manual
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INDICATIONS FOR USE To be used in nitrous oxide-oxygen sedation systems for delivering to a patient a mixture of nitrous oxide and oxygen gases with a maximum nitrous oxide concentration of 70%.
CONTRAINDICATIONS Contraindications for use of nitrous oxide/oxygen inhalation may include: 1. some chronic obstructive pulmonary diseases; 2. severe emotional disturbances or drug-related dependencies; 3. first trimester of pregnancy; 4. treatment with bleomycin sulfate; 5. methylenetetrahydrofolate reductase deficiency. Whenever possible, appropriate medical specialists should be consulted before administering analgesic/anxiolytic agents to patients with significant underlying medical conditions (e.g., severe obstructive pulmonary disease, congestive heart failure, sickle cell disease, acute oritis media, recent tympanic membrane graft, acute severe head injury.1) 1 American Academy of Pediatric Dentistry. Clinical Guidelines: Guidelines on Use of Nitrous Oxide for
Pediatric Dental Patients. Pediatr Dent 2009;31(6):148-151. Available at: “http://www.aapd.org/media/policies.asp”. Accessed February 23, 2010.
WARNINGS To be used only by a professional trained in the use of nitrous oxide. Patient should always be closely monitored during nitrous oxide use. If patient has an adverse reaction, reduce or stop the flow of nitrous oxide as needed. The O2 flush button can be used to rapidly purge the lines of N2O. If patient does not show signs of quick recovery, remove nasal hood and treat with pure oxygen from either the O2 resuscitator fitting or an auxiliary oxygen tank using a demand valve, oxygen assisted manual resuscitator, or equivalent. Call for emergency assistance if rapid response is not achieved. Do not use this device for the administration of general anesthesia or as part of, or in conjunction with, a general anesthesia administration system. Unit is calibrated at the factory to ±5% per industry recommendations. Verify that the correct gases are being delivered to the correct ports on the analgesia gas machine before initial use. This can be done by shutting off the oxygen cylinders in the tank room. Gases should not flow when flowmeters are turned on.
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CAUTIONS Federal (U.S.) law restricts this device to sale by or on order of a dentist or physician. Do not attempt to repair, alter, or calibrate this device. Unauthorized repair, alteration or misuse of this device is likely to adversely affect the performance and will void the warranty. Safety features contained in this notice should be routinely checked to assure proper function. If any of these safety features are not functioning properly, contact your dealer or Accutron and arrange for the necessary repairs before reusing the machine. Always use clean, dry medical gases. Introduction of moisture or other contaminants into Accutron analgesia gas machines may result in defective operation.
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Table of Contents
Page
Warnings and Cautions... 2 I.
Upright PC Unit Basic Mechanics... 8 Central System Mounting Options... 9 Portable System Installations... 10
II.
Cabinet Mount Unit Basic Mechanics... 12 Sample Installation...13
III.
Newport Portable System...14
IV.
Safety Features... 18
V.
General Instructions... 18
VI.
Directions for Use... 20
VII.
Periodic Equipment Checks... 21
VIII.
Rubber Goods Attachment... 23
IX.
Emergency Oxygen Equipment... 23
X.
Troubleshooting Guide...24
XI.
Warranty...25
XII.
Warranty & Returned Goods Policy...26
XIII.
Repair Service Policy...26
XIV.
Assistance...26
XV.
Ownership Information...27
© 2011 Accutron, Inc. Part No. 25097 - Rev. 06 - 12/2011
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I. PC UPRIGHT UNITS (For Portable & Central Systems) Oxygen Resuscitator Connection
Top Mounting Bracket (3/4" Ø)
Oxygen Flow Tube
Serial #
Nitrous Oxide Flow Tube
O2 Inlet DISS N2O Inlet DISS
Oxygen Flush Total Flow Knob Outspout
Bottom Mount Threads 1/2 – 20
% N2O Knob
Downspout
Room Air Override
TECHNICAL SPECIFICATIONS -10-
-9-8-
-7-
U L T R A
-6-5-4-3-2-
-7-6-5-4-
PC
-1-
-2-
13"
O
2
FLOW
+
-
O2Flush Off
N O 2
%
60%
-3-
-1-
NO 2
5"
Physical 5" x 13" x 8" (12, 7 x 33 x 20, 3 cm) Weight 5.1 lbs (2, 3 kg) Bottom mount: 1/2 – 20 Thread Top Mount: 3/4 Diameter Hole Gas Supply Oxygen: 50-55 PSI at 100 LPM N2O: 50-55 PSI at 10 LPM Gas Fittings Oxygen Inlet: Male DISS (CGA 124) N2O Inlet: Male DISS (CGA 1040) Mixed Gas Outlet: O.D. .875" (2, 2) Oxygen Resuscitator: 1/4" I.D. Quick Disconnect Gas Delivery Oxygen Flush: Min 20 LPM Oxygen Flow: 1 - 10 LPM (Accuracy, +/- 0.5 LPM) Oxygen Resuscitator : Min 100 LPM 100% O2 Nitrous Oxide Flow: 0 - 7 LPM (Accuracy +/- 0.5 LPM) Nitrous Oxide %: 0-70%* *50% Max Units Available
8" 8
PC UPRIGHT CENTRAL GAS SYSTEM MOUNTING OPTIONS Mobile Stand (Bottom Mount)
2 Gas Supply Lines Connect To Wall Outlet 1/2-20 Threaded Post Mobile Stand Under Cabinet Slide (Back Mount)
Mounting Cap
-9-
-7-
-8-
-6-
-7-
-5-
Wall Arm Bolt
-8-7-
-4-
-6-3-
-5-
-2-
-4-3-
-1 -
-2-1-
FLO
O Resusc2 itator
W
O Flu 2
Off
sh
O2 Resuscita
tor
Wall Arm Mounts (Back Mount)
Choice of : 9" Straight Bi-fold
Telescoping
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PC UPRIGHT 2-CYLINDER PORTABLE 17 1/4"
2-CYLINDER PORTABLE SYSTEM ASSEMBLY
-10-
-9-7-6-5-4-3-2-
-8-
U L T R A
-7-6-5-4-
PC
-1-
-2-
O2
FLO W
+
-3-
-1-
NO 2
-
O2Flush O2 Resuscita
Off
tor
N2O
Identify the following components in the 2-cylinder portable system package: • Flowmeter • Portable Manifold (with DISS Hoses and mobile stand attached) • E Cylinder Wrench (with chain attached)
400
2000
600 1000
200
3000
800 1000
4000
39 3/8"
14 5/8"
Flowmeter Mount (make sure lock washer is still in position prior to installation into flowmeter)
Locking Washer (remove protective cap from flowmeter mount prior to installation into flowmeter) Hole Cap Set Screw
E-Yoke (1 of 2) Manifold
N2O Hose
O2 Hose
Stand Post Mobile Base
1. Mount the flowmeter to the portable manifold: a. Remove hole cap from the upper hole (use sharp edge knife or screwdriver) at rear of manifold and release set screw (use 5/32" Allen Wrench) enough to remove flowmeter mount. b. Remove protective cap from threads of mount and remove from manifold. Thread flowmeter mount into hole on the bottom of flowmeter by hand and tighten firmly using 5/32" Allen Wrench placed in hole on side of flowmeter mount. c. Place flowmeter on manifold with mount in pocket. d. Tighten set screw firmly from rear while keeping flowmeter oriented toward front of manifold. e. Place hole cap into hole behind the set screw and push it all way in. 2. Attach the hoses to the flowmeter: a. Run the nitrous oxide hose under the manifold and attach it to the nitrous oxide DISS fitting located on the back of the flowmeter. b. Run the oxygen hose under the manifold and attach it to the oxygen DISS fitting located on the back of the flowmeter. Note: To avoid gas leaks, make certain all hose attachments are securely tightened. 3. Connect the gas cylinders to the manifold’s “E” yokes: a. Connect the nitrous oxide gas cylinders to the “E” yoke on the N2O side b. Connect the oxygen gas cylinders to the “E” yoke on the O2 side. c. It is recommended to use new gasket every time tank is replaced or removed. 4. (Keep wrench in handy location. It is used to open and close tanks). a. Open both gas cylinders and turn off flowmeter. b. Check hose connections for leaks using soap solution. c. Tighten fittings as needed to stop leaks. 5. Verify flowmeter operations. Note: See page 23 for attaching rubber goods, including scavenging circuit.
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PC UPRIGHT 4-CYLINDER PORTABLE 13 3/16"
16 9/16"
-10-
-9-7-6-5-4-3-2-
-8-
U L T R A
-7-6-5-4-
PC
-1-
-2-
O2
FLO W
+
-3-
-1-
NO 2
-
O2Flush O2 Resuscit ator
Off
N2O
31 5/16"
19"
4-CYLINDER PORTABLE SYSTEM ASSEMBLY Identity the following components in the 4-cylinder portable system package: • Flowmeter • Portable Manifold (with DISS hoses and adjustable mobile stand attached) • “E” Cylinder Wrench (chain attached)
E-Yoke (1 of 4)
Flowmeter Mounting Post
Portable Unit’s Handle
Black Knob (use to make height adjustments) Regulator (1 of 2) Stand Post Mobile Base
20 3/4"
1. Mount the flowmeter to the portable manifold: a) Remove the screw and washer from the top of the flowmeter mounting post (located on the manifold). b) Slip the fixed loop (located at the back of the flowmeter) over the mounting post. c) Re-attach the washer and screw to the top of the mounting post. 2. Attached the hoses to the flowmeter: a) Run the nitrous oxide hose under the manifold and attach it to the nitrous oxide DISS fitting located on the back of the flowmeter. b) Run the oxygen hose under the manifold and attach it to the oxygen DISS Fitting located on the back or the flowmeter. Note: To avoid gas leaks, make certain all hose attachments are securely tightened. 3. Connect the gas cylinders to the manifold’s E-yokes: a) Connect the nitrous oxide gas cylinders to the nitrous oxide “E” yokes. b) Connect the oxygen gas cylinders to the oxygen “E” yokes. 4. To adjust the portable flowmeter unit’s height: a) Loosen the black knob on the side of the manifold. b) Guide the stand post’s adjustable rod to desired position. c) Retighten the black knob. Note: See page 23 for attaching rubber goods, including scavenging circuit.
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II. PC CABINET MOUNT UNIT (For Central Gas Systems) % N2O Knob
O2 Flow Tube
N2O Flow Tube
Oxygen Flush
Mixed Gas Outlet Male DISS CGA 1160
Flow Control Knob
Nitrous Oxide Inlet Male DISS CGA 1040
Oxygen Inlet Male DISS CGA 1240
O2 Resuscitator
Serial # Label
Mounting Post With Wingnut
TECHNICAL SPECIFICATIONS 4 5/8" (12,2cm)
9 3/4" (25cm) 1 5/16" (3,3cm)
4 1/4" (11cm)
2 5/16" (5,8cm) 3 1/2" (8,9cm)
6 1/4" (15,9cm) MAX 1/4" (,64cm) HOLES 2x
4 1/2" (11,4cm) MAX
R 1/4" (,64cm) MAX 8 1/2" (21,6cm)
Physical 5" x 10" x 4" (13 x 25 x 10 cm) Weight 5.9 lbs (2, 7 kg) Gas Supply Requirement Oxygen: 50-55 PSI at 100 LPM N2O: 50-55 PSI at 10 LPM Gas Fittings Oxygen Riser: Male DISS (CGA 1240) with check valve N2O Riser: Male DISS (CGA 1040) with check valve CM Fittings Oxygen Inlet: Male DISS (CGA 1240) N2O Inlet: Male DISS (CGA 1040) Mixed Gas Out: Male DISS (CGA 1160) Oxygen Resuscitator: 1/4" I.D. Quick Disconnect Gas Delivery Oxygen Flush: Min 20 LPM Oxygen Flow: 1 - 10 LPM (Accuracy, +/- 0.5 LPM) Oxygen Resuscitator: Min 100 LPM 100% O2 Nitrous Oxide Flow: 0 - 7 LPM (Accuracy +/- 0.5 LPM) Nitrous Oxide %: 0-70%* *50% Max Units Available Note: Cabinet Mount units require remote outlet.
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SAMPLE INSTALLATION
Remote Outlet Options: Ultra PC™ % Flowmeter
a) Standard Bag Tee (Contains mixed gas outlet)
25 30
15 10 20 in Hg 5 0 VACUUM
b) Remote Flow System (RFS) (Contains mixed gas outlet, and vacuum controller with gauge display)
Remote Outlet
O2 & N2O Check Valve Risers
Note: See page 23 for attaching rubber goods, including scavenging circuit.
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III. Newport 4-Cylinder Portable" O2 Resuscitator Fitting
Regulators and E Yokes
Gas Cylinders
Line Pressure Gauges
Tank Restraint
Removable Bag Tee
Handle Warning: Do not hold handle when opening cabinet.
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Newport Setup and Connections View When looking at the front of the Newport cabinet, Nitrous Oxide is on the left as shown by the blue Nitrous Oxide gauge. Oxygen is on the right as shown by the oxygen gauge. Opening Newport Cabinet Open the Newport cabinet by placing one hand on the front cover and the other in the handle on the side. Pull handle back all the way. Install Gas Cylinders 1. Undo Velcro straps 2. Angle tank into position 3. Strap tanks loosely 4. Remove regulators from accessories box 5. Attach regulators to tanks by loosening yoke handle, verifying seal is in place, aligning seal with gas opening, aligning pins with holes in yoke, tightening yoke onto cylinder NOTE: Regulators are pinned to match gas cylinders. Connect gas hoses to regulator outputs. NOTE: Hoses and regulators use DISS fittings to prevent mix up. Rotate cylinders so that regulators fit inside. Open Gas Cylinders Pick one tank of each gas to be “in use“ tank and attach “in use” label to cylinder. Open these cylinders using the cylinder wrench provided in accessory box. Close Newport cabinet. Scavenging Circuit - Install bag tee from accessories box into front of Newport. - Attach scavenging circuit to bag tee. - Connect vacuum hose to system vacuum. - Install nasal hood into scavenging circuit and start vacuum flow per scavenging instructions.
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Newport: Managing Gas Supply 1. 2. 3. 4.
5.
Identify the two in-use tanks (N2O and O2) by attaching “in-use” identification tags to them. When one of the in-use tanks is empty, close the tank by turning the valve clockwise. Leave the empty tank in place. Move the “in-use” tag to the appropriate reserve tank, which now becomes the in-use tank. Replace the empty tank with a new tank, which then becomes the reserve tank. Open the valve of the new in-use tank by turning counterclockwise. Note: Do not open the reserve tank until the in-use tank is empty. When changing gas tanks, make certain both same gas cylinders that are involved in the exchange are closed. Always remember to switch the “in- use” tags over to the new tanks. Contact gas supplier to request new gas cylinders as needed.
Newport: Changing Gas Cylinders Always use clean, dry medical grade gases. Introduction of moisture or other contaminants into Accutron Analgesia gas machines may result in defective operation. The Newport Flowmeter System is designed to operate with a 50-55 psi line pressure on each gas (O2 and N2O). The line pressure can be determined by reading the O2 and the N2O line pressure gauges that are located on the front panel of the Newport. The Newport has features incorporated to make cylinder change-out easy. To assure proper operation of the system, 4 cylinders must be properly installed at all times. Please review the following cylinder replacement procedures before attempting to change cylinders. 1. 2. 3. 4. 5. 6.
Open the tank enclosure by sliding the cover to the rear. Close the valve on the empty tank (clockwise). Release the Velcro restraint on the empty tank. Tilt the empty tank out slightly. Loosen the round handle on the regulator yoke. Remove the regulator from the empty tank (make certain that the regulator is not dropped or damaged while it is off the tank). 7. Lay the empty cylinder down on the floor (cylinders should only stand upright when properly restrained as they can easily fall over). 8. Pick up the full replacement tank and place the bottom of the tank onto the floor of the Newport, leaving it slightly tilted outward for easy replacement of the regulator. 9. Check to assure that the sealing gasket has remained on the regulator’s E yoke. 10. Reattach the regulator to the new full tank by sliding the yoke (attached to the regulator) over the top of the tank post aligning the index pins with the corresponding holes in the tank post. 11. Tighten the round handle on the regulator yoke. 12. Push the tank into an upright position. Attach and tighten the Velcro tank restraint.
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Newport: Accessing Serial Number
Flowmeter is behind shield at front of unit.
Serial # Label
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IV. SAFETY FEATURES O2 Fail Safe System – Offers assurance that N2O ceases if the O2 supply is interrupted or reduced. Emergency Air Valve – Automatically provides patient with ambient air if gas flow is interrupted. Located on remote bag tee. Directional Check Valve – Prevents re-breathing of exhaled gases and protects against CO2 buildup. Located on remote bag tee. O2 Resuscitator Connection – Direct connection to O2 for use with resuscitator. Port is always open and provides 100 LPM minimum of pure oxygen.
V. GENERAL INSTRUCTIONS 1. Warranty Unpack flowmeter and inspect to make certain that the unit has not been damaged during shipment. The unit’s serial number is located on the back of the flowmeter (see page 17 for Newport's serial number location). Record the serial number in the area provided at the back of this booklet. Note: After Cabinet Mount model is mounted into a cabinet, the serial number will no longer be visible. Always reference the serial number when corresponding with Accutron. Complete the warranty card supplied with flowmeter Ultra and mail to Accutron. Completion of this step ensures proper device warranty coverage. Accutron analgesia machines carry a two-year limited warranty (see Warranty on page 25 for details).
2. Gas Supply Connection Always use clean, dry medical gases. Introduction of moisture or other contaminants into Accutron analgesia gas machines may result in defective operation. After device installation, connect the oxygen and nitrous oxide supply lines to the Diameter Specific Instant fittings or DISS fittings located on the back of the device. See pages 15 and 16 for information specific to the Newport. It is important that the regulators for both gases be set to give pressures in the range of 50-55 PSI. Verify that the correct gases are being delivered to the correct ports on device before initial use. This can be done closing O2 gas cylinders, opening N2O gas cylinders, and attempting to use flowmeter. Turn Total Flow Knob all the way open and % N2O Knob all the way to 70%. There should be no gas flow. If either gas tube shows flow, gas lines may be crossed internally. Turn off unit and call Accutron before use.
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3. CLEANING AND DISINFECTING THE FLOWMETER Cleaning: Clean flowmeter by wiping with moistened towel or spraying with disinfectant and wiping surface. If the disinfectant does not contain a cleaning agent, use a mild cleaner for this step. Disinfecting: Any of the following commercially available disinfectants can be used for disinfecting the flowmeter surface: Commercial Brand Name Lysol Brand II I.C. Disinfectant Spray
EPA Registration No. 777-72-675
EPA Establishment No. 777-NJ-2
EcoTru (Spray) CaviCide Microstat 2 Tablets
70791-1 46781-6 70369-1
034490-CA-001 46781-MI-1 69781-MN-01
Note: Reference the disinfectant's label instructions for appropriate application procedures and inactivation of specific organisms. Care should be taken not to let disinfectant seep into flowmeter’s sealed areas. Barriers: Barriers that are impervious to fluids are an acceptable alternative to chemical disinfection of environmental surfaces. In some cases, barriers may be the best way to prevent cross-contamination of equipment surfaces that are difficult to clean or that may be harmed by disinfectants. Choose barriers that are large enough to cover the area of concern, impervious to fluids such as blood and saliva, and do not impede the use of the device or equipment they cover. Change barriers between each patient.
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VI. DIRECTIONS FOR USE Read instructions completely before operating flowmeter device. Note: The steps listed below provide a basic functional description of the flowmeter usage. A training course that emphasizes a practical, hands-on approach combined with instructions on safe techniques for administration of nitrous oxide-oxygen conscious sedation is recommended before use of this flowmeter. Reference flowmeter diagrams on pages 8 or 12 to locate control knobs for appropriate flowmeter model. 1. Turn on unit and open valves on top of both the N2O and O2 “in-use” tanks. 2. Using Flow Knob, set oxygen flow rate to desired delivery level. Note: When the N2O is set at 0 and the Total Flow Knob is turned to the on position, the N2O ball might move rapidly from the bottom of the N2O flow tube and then immediately return to its resting place at the bottom of the flow tube. This is a normal occurrence and not an indication of malfunction. 3. Set % N2O Knob to desired percent level. 4. Adjust the total flow rate to the patient by turning the Flow Knob as follows: Turn the Flow Knob in a counter-clockwise direction to increase flow rate and in a clockwise direction to decrease flow rate. Total flow rate is the sum of the N2O flow rate and the O2 flow rate (Total flow rate = N2O flow rate + O2 flow rate). The numbers shown on the N2O Knob represent “% N2O of Total Flow.” These numbers are a guide to assist the doctor in adjusting the N2O flows. Accutron recommends the doctor always use O2 and N2O flow rates indicated in the flow tubes to calculate the N2O and O2 percentages. % N2O of Total Flow is calculated using the following formula: N2O Flow Rate x 100 (See chart for calculating % N2O = N2O Flow Rate + O2 Flow rate % N2O on p. 21) 5. When the procedure is nearing completion and the patient is placed on O2 only, make the following adjustments: Turn the % N2O Knob to zero and turn the Flow Knob in a counter-clockwise direction to increase O2 flow. 6. When the procedure is complete, turn the Flow Knob fully in a clockwise direction and make certain the unit is off. 7. At the end of each day turn off gas supply at the tanks. For 2-cylinder and 4cylinder models, close N2O cylinders and run N2O through flowmeter until trapped gas is gone and gauge reads empty. Turn off O2 cylinders and run O2 gas until O2 gauge reads empty. 20
VII. PERIODIC EQUIPMENT CHECKS
Quick Reference Chart for Calculating % N2O
N2O Flow LPM
10
67% 63% 59% 56% 53% 50%
9
69% 64% 60% 56% 53% 50% 47%
8
67% 62% 57% 53% 50% 47% 44%
7
70% 64% 58% 54% 50% 47% 44% 41%
6
67% 60% 55% 50% 46% 43% 40% 38%
5
63% 56% 50% 45% 42% 38% 36% 33%
4
67% 57% 50% 44% 40% 36% 33% 31% 29%
3
60% 50% 43% 38% 33% 30% 27% 25% 23%
2
67% 50% 40% 33% 29% 25% 22% 20% 18% 17%
1
50% 33% 25% 20% 17% 14% 13% 11% 10% 9%
1
2
3
4
5
6
7
8
9
10
O2 Flow LPM Check monthly
Oxygen Flush Valve Test
1. Make certain the % N2O Knob and Flow Knob are turned fully clockwise (off position). 2. Reservoir bag should remain connected to the bag tee downspout. 3. Disconnect the corrugated tube from the bag tee outspout. 4. Open Oxygen Flush Valve while blocking the flow from the bag tee outspout. Proper operation is indicated when the reservoir bag is filled in 5 - 10 seconds. Release blockage of oxygen flow from bag tee outspout after the 5 - 10 seconds, required to conduct the test, has elapsed.
21
Check monthly
Outspout Check Valve Test 1. Flowmeter should be in the off position.
2. Reservoir bag should be connected to the downspout of the bag tee. 3. Corrugated tube should be connected to the outspout of the bag tee but not connected to patient gas delivery tubing. 4. Breathe into the open end of the corrugated tube. The reservoir bag should not fill. If the bag does fill during this test, the Outspout Check Valve is not functioning properly. Do not use this analgesia gas machine prior to receiving technical assistance or repair.
Check monthly
Override Air Valve Test 1. Flowmeter should be in the off position.
2. Reservoir bag should be connected to the downspout of the bag tee. 3. Corrugated tube should be connected to the outspout of the bag tee but not connected to patient gas delivery tubing. 4. Draw air through the open end of the corrugated tube. The Override Valve on the bag tee should open and allow air to enter the corrugated tube. Place your finger over the Override Valve and remove it to verify that air is entering the bag tee through the Override Valve. If the Override Valve does not function as described, do not use this analgesia gas machine prior to receiving technical assistance or repair. This test is best performed when the reservoir bag is completely deflated.
22
VIII. RUBBER GOODS ATTACHMENT 1. Slide the opening of the reservoir bag over the outside of bag tee downspout. U L T R A PC
2. Attach the corrugated tube over the outside of bag tee outspout. 3. Connect “Y” connector of scavenging circuit to the inside of the corrugated tube. 4. Connect scavenging vacuum tube to vacuum source. FLOW
0
%N2O
Bag Tee Downspout
Off
Bag Tee Outspout
Nasal Hood
Corrugated Tube
Scavenging Circuit Vacuum Tube
Reservoir Bag
For RFS Scavengers, vacuum controller is mounted on cabinet block, not in hoses. To Vacuum Source
IX. EMERGENCY OXYGEN EQUIPMENT Accutron flowmeters are equipped with a resuscitation connector which allows for the attachment of an oxygen demand valve. See Accutron Catalog (Emergency Oxygen Equipment Section) for information regarding Accutron Portable Oxygen System and Accutron Demand Valve.
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