Medication Devices
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4 2 5 1 0011 0010 1010 1101 0001 0100 1011 Math and Dosage Calculations for Health Care Third Edition Booth & Whaley McGraw-Hill 4-1 Chapter 4: Equipment for Dosage Measurement Edited by B. Holmes MSN/Ed, RN
Transcript of Medication Devices
42510011 0010 1010 1101 0001 0100 1011
Math and Dosage Calculations for Health
Care Third EditionBooth & Whaley
McGraw-Hill 4-1
Chapter 4: Equipment for Dosage Measurement
Edited by B. Holmes MSN/Ed, RN
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Learning Outcomes• Identify equipment used to administer medication.
• Indicate the appropriate equipment for delivering various types of medicine.
• Measure medications using the calibrations on the equipment.
• Describe the method of administration appropriate for each piece of measuring equipment.
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Introduction
• To prepare the correct dosage, it is important to be familiar with and use equipment properly.
– Accurately read the dosage markings
– Administration routes• Oral
• Parenteral – bypassing the digestive tract
• Topical / transdermal
• Drops, sprays, and mists
• Vaginal and rectal
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Oral Administration
• Measuring devices are calibrated or marked at varying intervals.– Calibrations are used to
• Measure the amount of liquid in the container
• Compare to desired dose
• Match physician’s order units– If container and order do not match, convert order to units
of measurement to be used.
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Oral Administration (cont.)
• Equipment
– Medicine cups
– Droppers
– Calibrated spoons
– Oral syringes
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Oral Administration (cont.)
• Medicine cups– Measurements from all three systems
• Metric
• Household
• Apothecary
– Meniscus • Curve in the surface of the liquid
• Measure quantity at the bottom of the curve
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Oral Administration (cont.)
Rule 4 - 1Rule 4 - 1
Do not use medicine cups for doses less than 5 mL, even if the cup has calibrations smaller than 5 mL.
– To ensure accuracy use• a dropper
• a calibrated spoon
• an oral syringe
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Droppers
• Uses– Measure and
administer small amounts of oral liquid medication
– Deliver medication to the eyes, ears, and nose
– Oral pediatric doses
• Units of measurement vary with dropper– Packaged with product
– Do not interchange droppers
– Do not put the dropper in the patient’s mouth
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Calibrated Spoons
• Used with pediatric and elderly patients
• Administer medication directly into the mouth or into food or beverage
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Oral Syringes
• Used for quantities less than 5 mL
• Safety features– Eccentric tips– Tinted
• Not sterile
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Oral Syringes (cont.)
Rule 4 – 2 Rule 4 – 2 1. Never attach a hypodermic needle to an oral
syringe.
2. Never inject an oral dose.
3. In emergencies, you may use a hypodermic syringe without a needle to measure and administer liquid oral doses, but never while its needle is attached.
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Oral Administration (cont.)
• When a patient cannot take medication orally, medications can be administered through a tube to the stomach.
• Types– Nasogastric tube
– PEG tube
– Jejunostomy tube
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Error Alert!
• Utensil used must provide the calibration needed to accurately measure the dose.
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ExampleExample
Which would you select to administer ½ tsp. of a liquid medication?
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Practice
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Determine if the statements below are true.
1. You may use a hypodermic syringe with a needle to measure liquid for oral administration.
2. Oral and hypodermic syringes are identical in appearance.
3. Measuring spoons used for baking are acceptable for measuring liquid medications.
False
False
True
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Practice
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4. Oral medication comes in a bottle labeled 200 mg/5 cc. The dose to be administered is 600 mg. Which of the following is the correct dose?
a) 1 tspb) 2 tspc) 1 tbsp = 15mLd) 2 tbsp
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Hypodermic Syringes
• Parenteral administration
• Administer medications by injection– Intravenous (IV)
– Intramuscular (IM)
– Intradermal (ID)
– Subcutaneous (Sub-Q)
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Standard Syringes
• Calibrated in milliliters (mL)– Metric system is used most
often– May be marked in minims
• Allow for measurement of small doses
• 3-mL syringe most common4-17
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Standard Syringes (cont.)
• Zero calibration – edge of barrel near needle
• Leading ring - tip of plunger closest to needle
• Trailing ring – ring farthest from needle
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Click to view syringe
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Hypodermic Syringes (cont.)
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Trailing RingLeading Ring
Plunger
Leading RingTrailing Ring
Leading Ring
Barrel
Syringe hub
Needle
Trailing RingLeading Ring
Plunger
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Safety Syringes
• Same components as standard syringe
• Safety shields protect needle
• Reduce the chance of needlestick injury
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3 mL syringe with retractable needle
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Prefilled Syringes
• A single, standard dose of medication
– Use once and discard
– Usually marked in tenths of a mL
• Measure the dose carefully
• Discard any excess medication
prior to injection4-21
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Prefilled Syringes
Rule 4 - 3Rule 4 - 3When using a prefilled syringe, always examine the markings to determine whether the syringe is calibrated in milliliters or milligrams and calculate the dose accordingly.
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Insulin Syringes (cont.)
• Used only to measure and administer insulin
• Calibrated in units – Insulin doses order in units– U-100 insulin most common form
• 100 units of insulin per 1 mL
• Syringes available in 30, 50, and 100 Unit capacities
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Insulin Syringes (cont.)
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100 Unit Insulin Syringe
50 Unit Insulin Syringe
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Insulin Syringes (cont.)
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Comparison of insulin syringes:
50 unitsyringe
100 unitsyringe
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Insulin Syringes (cont.)
Rule 4 - 4Rule 4 - 4Never use any type of syringe other than an insulin syringe to measure and administer insulin.
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Tuberculin Syringes
• Used for doses less than 1 mL– Calibrated in
hundredths of a mL
• Requires careful measurement
• Examples:– PPD skin test– Vaccines– Heparin– Pediatric
medicines– Allergen extracts
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Tuberculin Syringes (cont.)
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1 mL Tuberculin Syringe
0.5 mL Tuberculin Syringe
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Tuberculin Syringes (cont.)
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Comparison of tuberculin syringes:
0.5 mL syringe
1 mL syringe
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Syringes for Established IV Lines • Used to administer medication and fluids directly into a
patient’s vein
• Uses the injection port of an IV line
• Advantages
– Eliminates repeated punctures for the patient
– Decreased risk of needlestick injuries
– Compatible drugs can be administered together
– Enables drug delivery on a periodic basis
– Enables dilution of the medication4-30
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Syringes for Established IV Lines (cont.)
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Plastic injection tip
Injection port on IV line
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Large-Capacity Syringes
• Not all medication can be delivered in doses of 3 mL or less.
• Syringes with 5 mL, 10mL, 20 mL are available – Volume is measured in milliliters but calibrations
between may vary.
– Look carefully at the marks to measure an accurate amount of medication.
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Large-Capacity Syringes (cont.)
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10 mL syringe
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Error Alert!
Pay close attention to the calibration of any syringe you use.
– Check the marks carefully.
– Always align the leading ring with calibration.
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Ampules, Vials, and Cartridges
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Cartridge Vial
Ampule
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Cartridges
• Prefilled container shaped like a syringe barrel
• One dose of medication
• Fits a reusable syringe
• Examples– Tubex®
– Carpuject®
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Ampule
• Sealed container holding one dose of medication
• Snaps open• Use a standard syringe to
withdraw the medication• Use a paper towel to snap the top
of the ampule• Change needle after withdrawing
the medication
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Vials
• Container covered with a rubber stopper
• Contain one or more doses of medication
• Either liquid or powder form of medication that must be reconstituted
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Preparing the Syringe
Rule 4 - 5Rule 4 - 5 In most circumstances, the person who prepares a syringe for injection should deliver the injection.
Exceptions include:1. Pharmacy technicians who prefill syringes for nurses,
medical assistants, or patients2. Nurses or medical assistants preparing a syringe for a
physician3. Health-care workers teaching a patient to administer
his or her own medication4-39
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Needle Gauge and Length• Choose appropriate needle for injection
– Gauge• Interior diameter
• Smaller gauges correspond to larger diameters
• Use larger needles for more viscous drugs and deeper injections
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Needle Gauge and Length (cont.)
• Needle choice (cont.)
– Length
• The injection site determines length.
– Such as the size of your patient
• Length must be long enough to reach the desired area of tissue.
• Length must not be so long that it penetrates beyond the desired area.
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Needle Gauge and Length (cont.)
Type of Injection Needle Gauge Length (inches) for Adults
Intradermal 25-26 3/8 – 5/6
Subcutaneous 23 - 27 ½ - 5/8
Intramuscular 18 - 23 1 - 2
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Practice
Identify the parts of this syringe:
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Barrel
Syringe hub
Needle
Trailing RingLeading Ring
PlungerA. B.
C.D.
E.
F.
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Practice
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You have an order to administer 1.5 mL of a medication. It comes in a 3 mL prefilled syringe. What should you do?
ANSWER Carefully check the calibration and discard the excess medication prior to giving the injection. In this case, you would discard 1.5 mL medication. You should NEVER attempt to inject the correct dose without removing the excess medication first.
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Topical Medications
• Gels, creams, ointments, and pastes
• Apply directly to the skin– Use a glove, tongue blade, or cotton-tipped
applicator
– Avoid contact your own skin• Wear non-sterile gloves
to apply or remove4-45
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Transdermal Medications
• Form of topical medication absorbed through the skin.
• Use a self-adhesive patch.– Place patch on clean, dry, hairless skin with no rash or
irritation and with good circulation.
– Rotate placement sites.
– Remove older patches and dispose of them properly.
– Mark each new patch with your initials, the date, and the time.
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Transdermal Medications (cont.)
• Maintain a consistent level of medication in the blood.
• Bypass GI system.
• Uses – Cardiovascular drugs
– Hormones
– Allergy medications
– Pain medications
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Drops, Sprays, and Mists• Drops
– Instillations
– Nose, eyes, and ears
– Use the equipment that comes with the drug to administer the medication.
• Mists– Inhaled by patient
– Vaporizers – water used to create mist
– Nebulizers and metered dose inhalers (MDIs)
• Sprays – Nose and throat
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Vaginal and Rectal Medications
• Vaginal– Suppositories
– Tablets
– Douches for liquid forms of medication
– Creams and foams
• Rectal– Suppositories
– Enemas for liquid forms of medication
– Creams and foams
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Apply Your Knowledge
Which type of delivery device is used to administer medication to the eyes and ears?
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ANSWER Dropper
What instructions should you provide a patient who is starting a new medication delivered by a transdermal patch?
ANSWER The patch should be put on clean, dry, hairless skin with no rash or irritation. Placement sites should be rotated. Older patches should be removed and disposes of properly.
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Apply your Knowledge
What kind of syringe is used to deliver vaccinations?
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ANSWER Tuberculin
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Apply your Knowledge
How many mL are indicated on this syringe?
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ANSWER 1.6 mL
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End of Chapter 4
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Nothing will work unless you do.
~Maya Angelou
