10.1 Surgical Dressings, Drains, and Urinary Catheter Management

10.1 Surgical Dressings, Drains, and Urinary Catheter Management

The transition from intraoperative intervention to postoperative recovery requires meticulous attention to wound protection, fluid evacuation, and physiological monitoring. For the Tech in Surgery - Certified (NCCT TS-C) examination, knowledge of surgical dressings, passive and active drainage systems, thoracic chest drainage mechanics, and urinary catheterization protocols is heavily tested under the End of Procedure Tasks and Postoperative Care category — dressing preparation, post-surgical devices, and drains, catheters, and tubing.

The certified surgical technologist (CST) must maintain sterile field integrity during dressing placement, ensure correct assembly and activation of closed-suction and gravity drains, understand the pathophysiology of thoracic seal drainage, and follow strict aseptic catheterization standards.

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1. Surgical Wound Dressings: Taxonomy, Functions, and Application Protocols

Surgical wound dressings serve critical physiological and mechanical functions: protecting the incision from external microbial contamination, absorbing exudate and drainage, providing mechanical compression to eliminate dead space and prevent hematoma/seroma formation, immobilizing tissue to promote primary wound healing, and supporting aesthetic wound approximation.

+-----------------------------------------------------------------------------+
|                     SURGICAL DRESSING TAXONOMY SPECTRUM                     |
|                                                                             |
|   +-- 1. SINGLE-LAYER DRESSINGS ----------------------------------------+   |
|   |   - Semi-permeable polyurethane films (Opsite, Tegaderm, Bioclusive) |   |
|   |   - Liquid chemical collodion / Cyanoacrylate skin adhesives        |   |
|   |   - Reinforced adhesive skin closure strips (Steri-Strips)          |   |
|   +---------------------------------------------------------------------+   |
|                                                                             |
|   +-- 2. THREE-LAYER DRESSINGS (PRIMARY / INTERMEDIATE / OUTER) --------+   |
|   |   - Contact (Primary) Layer: Non-permeable, Semi-permeable, Permeable|   |
|   |   - Intermediate (Absorbent) Layer: 4x4 gauze, Fluffs, ABD pads     |   |
|   |   - Securing (Outer) Layer: Tape, Montgomery straps, Elastic wraps  |   |
|   +---------------------------------------------------------------------+   |
|                                                                             |
|   +-- 3. SPECIALIZED DRESSINGS -----------------------------------------+   |
|   |   - Pressure / Compression Dressings (Eliminate dead space/edema)   |   |
|   |   - Stent / Bolster Dressings (Tie-over sutures for skin grafts)    |   |
|   |   - Rigid Dressings (Plaster/fiberglass splints, casts, IPOP)       |   |
|   |   - Packing Dressings (Iodoform / NuGauze for cavity dead space)    |   |
|   |   - Negative Pressure Wound Therapy (NPWT / VAC subatmospheric)     |   |
|   +---------------------------------------------------------------------+   |
+-----------------------------------------------------------------------------+

Single-Layer Dressings

Single-layer dressings are indicated for clean, dry surgical incisions with minimal anticipated drainage or for superficial lacerations closed with subcuticular sutures:

1. Transparent Polyurethane Films (Opsite, Tegaderm, Bioclusive): Semi-permeable, waterproof, adhesive membranes that allow water vapor and oxygen exchange while acting as an impermeable barrier to liquid water, bacteria, and viral pathogens. Permits continuous direct visual inspection of the incision.
2. Liquid Chemical Collodion & Skin Sealants: Flexible liquid plastics painted over dry incisions that dry into a thin protective waterproof film.
3. Cyanoacrylate Tissue Adhesives (Dermabond, Histoacryl): Liquid 2-octyl cyanoacrylate formulations applied to topically opposed epidermal edges; polymerizes into a strong, microbial-barrier seal within 60 to 90 seconds, sloughing off naturally within 7 to 10 days.
4. Skin Closure Strips (Steri-Strips): Porous, non-woven rayon backing reinforced with polyester filaments, coated with hypoallergenic adhesive. Applied across incisions perpendicular to the wound margins (frequently paired with chemical skin adhesives like tincture of benzoin or Mastisol applied to adjacent skin to maximize adherence).

Three-Layer Dressings

The standard multi-layer surgical dressing consists of three distinct components designed to manage biological fluids, protect healing tissues, and maintain structural positioning.

+-----------------------------------------------------------------------------+
|                   THREE-LAYER DRESSING CROSS-SECTION                        |
|                                                                             |
|   [OUTER SECURING LAYER]   ====> Medipore / Silk Tape / Elastic Wrap / Coban |
|   [INTERMEDIATE ABSORBENT] ====> Fluffed Gauze / 4x4 Sponges / ABD Pad       |
|   [CONTACT PRIMARY LAYER]  ====> Xeroform / Adaptic / Telfa / Nu-Gel         |
|   -----------------------------------------------------------------------   |
|   [INCISION / EPIDERMIS]   ====> Suture / Staple Line (Clean & Dried)        |
+-----------------------------------------------------------------------------+

1. Contact (Primary) Layer

Directly contacts the wound surface and sutures. Classified according to permeability:

• Non-Permeable (Occlusive): Completely airtight and watertight; retains wound moisture and secretions, preventing dressing adherence and desiccating tissue damage. Examples include fine mesh gauze impregnated with white petrolatum (Vaseline gauze) or 3% Bismuth Tribromophenate petrolatum gauze (Xeroform). Xeroform provides mild bacteriostatic properties and deodorizing action, making it ideal for skin graft donor sites, open circumcisions, and thoracic drainage exit sites.
• Semi-Permeable (Semi-Occlusive): Non-adherent synthetic materials that permit the escape of excess exudate into the absorbent layer while maintaining a moist healing microenvironment without sticking to granulating wound tissue. Examples: Adaptic (knitted cellulose acetate coated with petrolatum emulsion), Telfa (perforated mylar/polyester film bonded to absorbent cotton core), and hydrogels/hydrocolloids (DuoDERM, Aquacel).
• Permeable (Non-Occlusive): Porous fine mesh or coarse cotton gauze that allows exudate and fluid to pass directly through into the intermediate layer. Must be used with caution over exposed fragile granulations as drying exudate can cause painful adherence and secondary mechanical trauma upon dressing removal.

2. Intermediate (Secondary / Absorbent) Layer

Placed directly over the contact layer to absorb wound drainage, cushion against external trauma, and distribute compressive forces uniformly:

• Gauze Sponges (4x4 inches): Open, woven cotton sponges (must be non-radiopaque when used as dressings to prevent confusing postoperative plain radiographs).
• Fluffs: Unfolded and loosely crumpled 4x4 gauze sponges or Kerlix rolls providing superior fluid absorption capacity and mechanical padding.
• ABD (Abdominal / Army Battlefield Dressing) Pads: Thick, highly absorbent multi-layer cotton/cellulose pads backed with a moisture-resistant hydrophobic barrier layer (indicated by a blue line facing outward) to prevent strike-through contamination.

3. Securing (Outer) Layer

Secures the inner dressing layers firmly to the patient's anatomical contours:

• Medical Tapes:
  • Silk Tape (Durapore): High-strength, woven silk cloth adhesive tape providing rigid fixation; aggressive adhesive requires careful removal to avoid epidermal stripping.
  • Paper Tape (Micropore): Hypoallergenic, gentle, breathable paper tape ideal for delicate, geriatric, or pediatric skin.
  • Elastic Foam Tape (Microfoam): Highly expandable, cushioned tape used for pressure dressings and contouring over moving joints.
  • Soft Cloth Surgical Tape (Medipore): Multi-directional stretch perforated tape that accommodates postoperative tissue swelling.
• Montgomery Straps: Paired adhesive fabric sheets with reinforced eyelets placed on opposing sides of an incision and laced together with umbilical tape or twill ties. Specifically designed for wounds requiring frequent dressing changes (e.g., heavily exudative open abdominal wounds), completely eliminating the need to repeatedly tear adhesive tape from delicate skin.
• Tubular Elastic Netting (Surgitube, Spandage): Elasticated woven tubular sleeves that slip over extremities, head, or torso to secure dressings without any skin-contact adhesive.
• Cohesive / Elastic Bandages (ACE Wrap, Coban): Self-adherent wraps providing variable circumferential compression and anatomical immobilization.

Specialized Dressing Configurations Matrix

Aseptic Technique in Dressing Application

+-----------------------------------------------------------------------------+
|                  ASEPTIC DRESSING PLACEMENT SEQUENCE                        |
|                                                                             |
|   1. COMPLETE CLOSURE & FINAL COUNT CLEARED                                 |
|      - Final closing count must be verified correct prior to dressing.      |
|                                                                             |
|   2. INCISIONAL WOUND CLEANSING & DRYING                                    |
|      - Cleanse incision of blood/fluids using damp sterile water sponge.    |
|      - Thoroughly dry skin with sterile dry 4x4 gauze (ensures adhesion).   |
|                                                                             |
|   3. APPLICATION OF SKIN ADHESIVES / CONTACT LAYER                          |
|      - Apply Benzoin / Mastisol to intact skin perimeter (avoid incision).  |
|      - Place sterile contact layer (Xeroform/Adaptic) directly over wound.  |
|                                                                             |
|   4. INTERMEDIATE & SECURING LAYER PLACEMENT                                |
|      - Place sterile fluffs/ABD pads; secure with tape or elastic wrap.     |
|                                                                             |
|   5. DRAPE REMOVAL UNDER STERILE SCRUB COVERAGE                             |
|      - CST holds dressed incision safely with sterile towel/gloved hand.    |
|      - Circulator/surgical team rolls drapes away from operative site.      |
|      - CST maintains sterile mayo stand/back table until patient departs OR.|
+-----------------------------------------------------------------------------+

[!IMPORTANT] Critical NCCT Rule on Dressing Application Timing: Surgical dressings must be applied BEFORE sterile drapes are removed. Applying dressings prior to drape removal prevents airborne contamination and accidental contact of the fresh, unepithelialized incision with unsterile drapes, blankets, or personnel. The scrub technologist must keep their gloves and gown sterile, cover the applied dressing with a clean towel, and maintain pressure while drapes are rolled away from the sterile perimeter.

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2. Surgical Drains: Classification, Physics, and Management

Surgical drains are mechanical conduits designed to evacuate abnormal accumulations of blood, serous fluid, lymph, purulent exudate, bile, or air from operative cavities and anatomical tissue planes. Evacuating fluid eliminates dead space, prevents seroma/hematoma formation, reduces interstitial tissue tension, prevents organ compression, and diminishes the medium for bacterial proliferation.

+-----------------------------------------------------------------------------+
|                        SURGICAL DRAIN TAXONOMY                              |
|                                                                             |
|   +-- 1. PASSIVE DRAINS (Gravity & Capillary Dynamics) -----------------+   |
|   |   - Penrose Drain (Flat latex/silicone tube; capillary action)       |   |
|   |   - Cigarette Drain (Gauze-cored Penrose for wicking)               |   |
|   |   - T-Tube (Biliary decompression into external gravity bag)        |   |
|   |   - Mushroom / Pezzer / Malecot (Suprapubic gravity drainage)       |   |
|   +---------------------------------------------------------------------+   |
|                                                                             |
|   +-- 2. ACTIVE DRAINS (Closed-Suction Mechanical Vacuum) --------------+   |
|   |   - Jackson-Pratt (JP) (Silicone flat/round tube + 100/400 mL bulb) |   |
|   |   - Hemovac (High-volume spring-loaded accordion canister)          |   |
|   |   - Blake Drain (4-channel fluted silicone core + suction bulb)     |   |
|   |   - Negative Pressure Wound Therapy (NPWT / VAC continuous vacuum)  |   |
|   +---------------------------------------------------------------------+   |
+-----------------------------------------------------------------------------+

Passive Drainage Systems

Passive drains function without mechanical suction, relying entirely on gravity, positive tissue pressure gradients, and capillary action (wicking) to transport fluids along or through the drain material to an external dressing or collection bag.

1. Penrose Drain: A soft, flexible, flat latex or silicone tube. Placed directly into tissue beds (e.g., groin dissections, abscess cavities, retraction of spermatic cord in inguinal hernia repair). Fluid drains around the exterior surface via capillary action into an absorbent gauze dressing. A sterile safety pin is passed perpendicularly through the exposed distal end to prevent the drain from inadvertently retracting into the deep wound cavity.
2. T-Tube (Biliary Drain): A specialized T-shaped rubber or silicone catheter placed into the common bile duct (CBD) following open choledochostomy (CBD exploration for choledocholithiasis) or biliary reconstruction. The two transverse cross-arms rest inside the lumen of the common bile duct, while the long vertical stem is brought out through a separate right upper quadrant stab incision and connected to a sterile gravity drainage bile bag. It prevents postoperative biliary hypertension and stricture, decompresses the biliary tree, and provides a portal for postoperative T-tube cholangiography.

+-----------------------------------------------------------------------------+
|                           BILIARY T-TUBE DYNAMICS                           |
|                                                                             |
|                     Hepatic Ducts                                           |
|                        \     /                                              |
|                         \   /                                               |
|                          \ /                                                |
|                    +-----[ ]-----+  <--- Transverse Cross-Arms seated       |
|                    |  T-TUBE ARM |       inside Common Bile Duct (CBD)      |
|                    +-----[ ]-----+                                          |
|                          | |                                                |
|                          | | <--- Long Stem exits through separate          |
|                          | |      RUQ abdominal stab wound                  |
|                          | |                                                |
|                          | v                                                |
|                     [GRAVITY BAG] (Collects golden-brown bile drainage)     |
+-----------------------------------------------------------------------------+

Active (Closed-Suction) Drainage Systems

Active drains utilize continuous or intermittent subatmospheric negative pressure (vacuum) generated by a compressed mechanical reservoir. The sealed system maintains sterile containment, eliminates environmental cross-contamination, allows precise quantitative measurement of output, and decreases bacterial migration along the drain tract.

+-----------------------------------------------------------------------------+
|                  JACKSON-PRATT (JP) CLOSED SUCTION SYSTEM                   |
|                                                                             |
|   [FENESTRATED SILICONE TUBE]  ====> Implanted in deep surgical dead space  |
|               |                                                             |
|               v                                                             |
|   [CONNECTING DRAIN TUBING]    ====> Exits skin via separate stab incision  |
|               |                                                             |
|               v                                                             |
|   [ONE-WAY ANTI-REFLUX VALVE]  ====> Prevents retrograde fluid backflow     |
|               |                                                             |
|               v                                                             |
|   [COMPRESSIBLE SILICONE BULB] ====> Squeezed flat to generate -50 mmHg     |
|               |                      negative suction vacuum                |
|               v                                                             |
|   [POURING SPOUT & PLUG]       ====> Opened to empty fluid / re-primed      |
+-----------------------------------------------------------------------------+

1. Jackson-Pratt (JP) Drain:
   • Consists of a white, radiopaque, flat or round silicone tubing with multiple precision perforations (fenestrations) connected via clear tubing to a pliable, bulb-shaped silicone suction reservoir (typically 100 mL or 400 mL capacity).
   • Activation Protocol: The drainage reservoir is emptied, the bulb is fully squeezed with one hand to evacuate all air, and the drainage port plug is securely seated while the bulb remains compressed. The expanding bulb creates a constant, gentle negative pressure vacuum (~50 to 100 mmHg).
   • Clinical Use: Mastectomy, axillary dissection, thyroidectomy, abdominal/pelvic laparotomy, plastic reconstruction.
2. Hemovac Drain:
   • Consists of a perforated round radiopaque catheter connected to a rigid, circular, spring-loaded accordion evacuation canister (400 mL to 800 mL capacity).
   • Activation Protocol: Canister is placed flat on a hard surface, compressed downward with both palms to fully collapse internal steel springs and evacuate air, and the pouring plug is sealed. The internal recoil springs exert high, continuous negative pressure.
   • Clinical Use: Orthopedic total joint arthroplasty, spinal fusion, open reduction internal fixation, extensive soft tissue trauma.
3. Blake Drain:
   • A flexible silicone drain featuring four longitudinal fluted channels surrounding a solid central core rather than perforated holes. Channel geometry utilizes both capillary action and mechanical suction, significantly reducing tissue ingrowth, clotting, and pain upon drain extraction.

Drain Placement and Intraoperative CST Protocol

• Stab Incision Technique: Drains are almost universally brought out through a separate, small stab incision located several centimeters away from the primary surgical incision. Passing a drain directly through the primary incision increases the incidence of surgical site infections (SSIs) and impairs primary wound edge healing.
• Passing Sequence: Surgeon grasps the non-fenestrated end of the drain tubing with a heavy curved clamp (Kelly, Pean) or uses a sharp integral trocar attached to the drain. The trocar/clamp is pushed through the abdominal/tissue wall from inside to outside. The trocar is immediately cut off with heavy mayo scissors and placed in the sharps container. The CST connects the drain tubing to the suction reservoir.
• Suture Fixation: The drain is anchored securely to the skin at the exit site with a non-absorbable monofilament suture (2-0 or 3-0 Silk, Nylon, or Polypropylene on a cutting needle) using a purse-string or Roman sandal (air-knot) wrapping technique.

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3. Thoracic Closed-Seal Chest Drainage Systems

The thoracic pleural cavity maintains a physiological subatmospheric (negative) pressure of -4 to -8 cmH2O relative to ambient atmospheric pressure. This continuous negative intrapleural pressure keeps the visceral pleura of the lungs tightly adhered to the parietal pleura of the chest wall, preventing pulmonary alveolar collapse.

When thoracic trauma, thoracic surgery (thoracotomy, lobectomy, pneumonectomy), or cardiac procedures disrupt pleural integrity, atmospheric air, blood, or lymphatic fluid rushes into the pleural space, abolishing negative pressure and causing partial or complete pneumothorax (air), hemothorax (blood), or hemopneumothorax.

+-----------------------------------------------------------------------------+
|                 THREE-CHAMBER CLOSED-SEAL CHEST DRAINAGE                    |
|                                                                             |
|   FROM PATIENT CHEST TUBE                                                   |
|             |                                                               |
|             v                                                               |
|   +-------------------+   +-------------------+   +-------------------+     |
|   |    CHAMBER 1:     |   |    CHAMBER 2:     |   |    CHAMBER 3:     |     |
|   |    COLLECTION     |==>|    WATER SEAL     |==>|  SUCTION CONTROL  |==>TO|
|   |     CHAMBER       |   |     CHAMBER       |   |     CHAMBER       |  VAC|
|   |                   |   |                   |   |                   |     |
|   | - Calibrated mL   |   | - 2 cm H2O column |   | - -20 cm H2O      |     |
|   | - Traps blood and |   | - 1-way air valve |   | - Controls vacuum |     |
|   |   serous exudate  |   | - Shows TIDALING  |   | - Bubbles gently  |     |
|   +-------------------+   +-------------------+   +-------------------+     |
+-----------------------------------------------------------------------------+

The Three-Chamber Drainage Mechanism (Pleur-evac / Atrium)

Chamber 1: Collection Chamber

• Directly receives drainage (blood, transudate, pus) and air from the patient's pleural catheter.
• Fluid collects in calibrated columns for accurate hourly volume, rate, and character documentation, while evacuated air passes unhindered into Chamber 2.

Chamber 2: Water-Seal Chamber

• Acts as a one-way valve: allows air and fluid to escape from the patient's pleural space into the unit, but prevents atmospheric air from being sucked back into the thoracic cavity during inspiration.
• Formed by a U-tube submerged under 2 cm of sterile water.
• Tidaling: The normal cyclical rise and fall of the water level within the water-seal chamber corresponding to patient respirations:
  • Spontaneous Breathing Patient: Water level rises during inspiration (increased negative intrathoracic pressure) and falls during expiration.
  • Positive-Pressure Mechanical Ventilation: Water level falls during inspiration (positive airway pressure pushes diaphragm down) and rises during expiration.
  • Cessation of Tidaling: Indicates either that the lung has fully re-expanded (cured) or that the chest tube is obstructed, kinked, or clotted.
• Air Leak Dynamics: Continuous, vigorous bubbling in the water-seal chamber indicates an active air leak (either an ongoing pulmonary alveolar-pleural fistula in the patient or an unsealed mechanical connection in the drainage tubing). Intermittent bubbling during coughing or forced exhalation is normal during early post-op recovery.

Chamber 3: Suction Control Chamber

• Regulates the maximum negative pressure (vacuum) transmitted to the patient's pleural space, preventing tissue trauma from excessive wall suction.
• Wet Suction Systems: Filled with sterile water to a calibrated depth—traditionally -20 cmH2O. Wall suction is increased until gentle, steady bubbling occurs in the chamber. The height of the water column (not the wall regulator gauge) determines the suction force applied to the patient.
• Dry Suction Systems: Employs a mechanical, spring-loaded rotary dial calibrated from -10 to -40 cmH2O, eliminating water evaporation.

Critical Chest Tube Safety Rules & Emergency Protocols

+-----------------------------------------------------------------------------+
|                       CHEST TUBE EMERGENCY PROTOCOLS                        |
|                                                                             |
|   [ACCIDENTAL SYSTEM DISCONNECTION]                                         |
|   - Submerge distal end of chest tube in 2 cm of STERILE WATER or SALINE.   |
|   - Instantly re-establishes water seal; prevents atmospheric air entry.    |
|                                                                             |
|   [ACCIDENTAL TUBE DISLODGEMENT FROM CHEST WALL]                            |
|   - Immediately place STERILE PETROLATUM (XEROFORM) GAUZE over stab site.   |
|   - Tape securely on THREE SIDES ONLY (creates flutter-valve release).      |
|   - Prevents atmospheric air intake while allowing trapped air escape.      |
|                                                                             |
|   [NEVER ROUTINELY CLAMP A CHEST TUBE]                                      |
|   - Clamping traps accumulating air/blood -> rapid TENSION PNEUMOTHORAX.    |
|   - Clamp ONLY momentarily when replacing full unit or testing leak source. |
|                                                                             |
|   [ALWAYS MAINTAIN UNIT IN DEPENDENT POSITION]                              |
|   - Drainage unit MUST remain upright and BELOW THE LEVEL OF THE CHEST.     |
|   - Lifting unit above chest causes retrograde fluid siphoning into lung.   |
+-----------------------------------------------------------------------------+

[!CAUTION] Tension Pneumothorax Hazard: Clamping a chest tube while an active air leak is present converts an open pneumothorax into a life-threatening tension pneumothorax. Accumulating positive pleural pressure compresses the ipsilateral lung, causes catastrophic mediastinal shift toward the contralateral side, kinks the superior and inferior vena cavae, halts cardiac venous return, and precipitates acute cardiovascular collapse. Never clamp a chest tube during transport!

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4. Urinary Catheter Management: Types, Insertion, and CAUTI Prevention

Urinary catheterization involves the aseptic introduction of a flexible tubular catheter through the urethra into the urinary bladder. Indications include decompression of the bladder to prevent intraoperative accidental injury during lower abdominal/pelvic surgery (laparotomy, hysterectomy, cesarean section), continuous monitoring of renal perfusion and hemodynamic output, management of acute urinary retention, and continuous bladder irrigation (CBI).

+-----------------------------------------------------------------------------+
|                        URINARY CATHETER TAXONOMY                            |
|                                                                             |
|   1. NON-RETENTION (STRAIGHT / ROBINSON) CATHETERS                          |
|      - Single-lumen red rubber or clear vinyl catheter.                     |
|      - Used for one-time bladder drainage or sterile urine sampling.        |
|                                                                             |
|   2. TWO-WAY INDWELLING FOLEY RETENTION CATHETERS                           |
|      - Lumen 1: Large drainage channel for continuous urinary outflow.      |
|      - Lumen 2: Small inflation channel with Luer-Lok valve for balloon.    |
|      - Balloon: 5 mL capacity (inflated with 10 mL sterile water).          |
|                                                                             |
|   3. THREE-WAY INDWELLING FOLEY RETENTION CATHETERS                         |
|      - Lumen 1: Urinary drainage channel.                                   |
|      - Lumen 2: Balloon inflation channel (often 30 mL for hemostasis).     |
|      - Lumen 3: Continuous Bladder Irrigation (CBI) infusion channel.       |
|      - Used post-TURP (Transurethral Resection of Prostate) to flush clots. |
|                                                                             |
|   4. SPECIALIZED TIPS                                                       |
|      - Coudé Tip: Curved, tapered tip to bypass enlarged prostate lobes.    |
|      - Council Tip: Open hole in tip for insertion over a guide wire.       |
|      - Pezzer (Mushroom) / Malecot (Winged): Self-retaining suprapubic.     |
+-----------------------------------------------------------------------------+

French Sizing Scale (Charrière System)

Urinary catheters are sized according to the French (Fr) scale, where: $\text{French Size (Fr)} = \text{Outside Diameter in Millimeters} \times 3$ $\text{1 Fr} = 0.333\text{ mm (0.013 inches) outside diameter}$

• Adult Females: 14 Fr to 16 Fr (with 5 mL balloon)
• Adult Males: 16 Fr to 18 Fr (with 5 mL balloon)
• Pediatrics: 8 Fr to 10 Fr
• Hematuria / Continuous Irrigation: 20 Fr to 24 Fr (three-way catheter with 30 mL balloon)

Balloon Inflation Standards and Dynamics

• Inflation Medium: Retention balloons must be inflated EXCLUSIVELY with sterile water.
• Why Sterile Saline is Prohibited: Saline solution contains sodium chloride which precipitates into microscopic salt crystals over time. These crystals clog the microscopic one-way inflation lumen and valve mechanism, preventing subsequent balloon deflation and necessitating invasive cystoscopic balloon puncture.
• Why Air is Prohibited: Air-filled balloons float toward the bladder neck, creating mechanical irritation, failing to seat properly over the urethrovesical junction, and leaking spontaneously through permeable silicone membranes.
• Filling Volume: A standard 5 mL balloon must be inflated with 10 mL of sterile water (5 mL fills the internal dead space of the catheter shaft channel, leaving 5 mL to fully expand the spherical balloon symmetrically).

Catheter-Associated Urinary Tract Infection (CAUTI) Prevention Protocols

CAUTI represents one of the most prevalent hospital-acquired infections (HAIs). Surgical technologists and circulating nurses must enforce strict CDC/AORN infection control bundles:

1. Aseptic Insertion: Strict sterile technique, sterile gloves, sterile fenestrated drape, and liberal application of water-soluble lubricant (e.g., K-Y Jelly; never oil-based lubricants which degrade latex).
2. Closed System Integrity: The sterile pre-connected junction between the Foley catheter and the collection bag tubing must never be disconnected. If the closed seal is broken, the entire catheter and bag system must be replaced.
3. Dependent Drainage Bag Positioning: The urinary collection bag must always be positioned BELOW the level of the patient's bladder to prevent gravitational backflow of stagnant, colonized urine into the sterile bladder cavity.
4. Floor Clearance: The drainage bag and drain spout must never touch the floor.
5. Securement: Anchor the catheter shaft firmly to the patient's anterolateral thigh (females) or lower abdomen/anterior thigh (males) using a commercial stabilization device (StatLock) to eliminate urethral traction and pressure necrosis.