| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Dilation and insertion of tube into esophagus (procedure) | Direct device | False | Tube | Inferred relationship | Some | 2 | 
| Endobronchial tube (physical object) | Is a | True | Tube | Inferred relationship | Some |  | 
| Esophageal tracheal double lumen supraglottic airway device (physical object) | Is a | True | Tube | Inferred relationship | Some |  | 
| Difficult intubation | Direct device | False | Tube | Inferred relationship | Some | 1 | 
| Intubation of respiratory tract (procedure) | Direct device | True | Tube | Inferred relationship | Some | 1 | 
| Intubation | Direct device | True | Tube | Inferred relationship | Some | 1 | 
| Digital assisted intubation (procedure) | Direct device | False | Tube | Inferred relationship | Some | 1 | 
| Dilation and insertion of tube into esophagus (procedure) | Direct device | True | Tube | Inferred relationship | Some | 2 | 
| Unexpected difficult intubation | Direct device | False | Tube | Inferred relationship | Some | 1 | 
| Expected difficult intubation | Direct device | False | Tube | Inferred relationship | Some | 1 | 
| Intubation AND aspiration | Direct device | True | Tube | Inferred relationship | Some | 1 | 
| Replacement of peritoneal dialysis transfer set | Direct device | False | Tube | Inferred relationship | Some | 1 | 
| Intubation using medication (procedure) | Direct device | True | Tube | Inferred relationship | Some | 1 | 
| Retrograde intubation (procedure) | Direct device | True | Tube | Inferred relationship | Some | 1 | 
| Assessment of ureterostomy tube | Direct device | True | Tube | Inferred relationship | Some | 1 | 
| Liposuction system | Is a | False | Tube | Inferred relationship | Some |  | 
| Neurosurgical suction regulator | Is a | False | Tube | Inferred relationship | Some |  | 
| Pneumatic trabeculoplasty system | Is a | False | Tube | Inferred relationship | Some |  | 
| Portable oxygen concentrator | Is a | False | Tube | Inferred relationship | Some |  | 
| Oxygen administration face tent (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Oxygen administration hood, adult | Is a | False | Tube | Inferred relationship | Some |  | 
| Oxygen administration tent, adult (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Nasal lavage system (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Partial-rebreathing oxygen face mask | Is a | False | Tube | Inferred relationship | Some |  | 
| Stationary oxygen concentrator | Is a | False | Tube | Inferred relationship | Some |  | 
| Ventilator intermittent mandatory ventilation supplemental circuit, reusable | Is a | False | Tube | Inferred relationship | Some |  | 
| Ventilator intermittent mandatory ventilation supplemental circuit, single-use | Is a | False | Tube | Inferred relationship | Some |  | 
| Venturi oxygen face mask | Is a | False | Tube | Inferred relationship | Some |  | 
| Automatic pneumatic pulmonary resuscitator, reusable | Is a | False | Tube | Inferred relationship | Some |  | 
| Tracheal pilot tube repair kit | Is a | False | Tube | Inferred relationship | Some |  | 
| Tracheostomy mask, aerosol (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Tracheostomy mask, oxygen | Is a | False | Tube | Inferred relationship | Some |  | 
| Surgical fluid/gas irrigator | Is a | False | Tube | Inferred relationship | Some |  | 
| Surgical irrigation/aspiration system (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Surgical mist irrigation tip (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Therapeutic plasma exchange system set | Is a | False | Tube | Inferred relationship | Some |  | 
| Breathing mouthpiece, reusable | Is a | False | Tube | Inferred relationship | Some |  | 
| Breathing mouthpiece, single-use | Is a | False | Tube | Inferred relationship | Some |  | 
| Bronchial tube stylet | Is a | False | Tube | Inferred relationship | Some |  | 
| Cold-air diagnostic inhalation system | Is a | False | Tube | Inferred relationship | Some |  | 
| Contrast medium delivery/evacuation kit, barium enema | Is a | False | Tube | Inferred relationship | Some |  | 
| Contrast medium injection system hand controller kit | Is a | False | Tube | Inferred relationship | Some |  | 
| Adipose tissue stem cell recovery set | Is a | False | Tube | Inferred relationship | Some |  | 
| Dental dry field device (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Dental dry field kit | Is a | False | Tube | Inferred relationship | Some |  | 
| Dental ozone system handpiece | Is a | False | Tube | Inferred relationship | Some |  | 
| Dental suction system regulator | Is a | False | Tube | Inferred relationship | Some |  | 
| Dental/oral lavage system | Is a | False | Tube | Inferred relationship | Some |  | 
| Aerosol tent, adult | Is a | False | Tube | Inferred relationship | Some |  | 
| Airway obstruction suction extractor | Is a | False | Tube | Inferred relationship | Some |  | 
| Endotracheal tube cleaning brush (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Endotracheal tube guide, reusable | Is a | False | Tube | Inferred relationship | Some |  | 
| Endotracheal tube guide, single-use | Is a | False | Tube | Inferred relationship | Some |  | 
| Endotracheal tube introducer, reusable | Is a | False | Tube | Inferred relationship | Some |  | 
| Endotracheal tube introducer, single-use | Is a | False | Tube | Inferred relationship | Some |  | 
| Endotracheal tube stylet, reusable | Is a | False | Tube | Inferred relationship | Some |  | 
| Endotracheal tube stylet, single-use | Is a | False | Tube | Inferred relationship | Some |  | 
| Manual pulmonary resuscitator, reusable | Is a | False | Tube | Inferred relationship | Some |  | 
| Manual pulmonary resuscitator, single-use | Is a | False | Tube | Inferred relationship | Some |  | 
| General-purpose suction system, vacuum (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Cecostomy tube procedure using fluoroscopic guidance | Procedure device (attribute) | False | Tube | Inferred relationship | Some | 2 | 
| Tubing set | Is a | False | Tube | Inferred relationship | Some |  | 
| Tubing | Is a | False | Tube | Inferred relationship | Some |  | 
| Earmould impression kit | Is a | False | Tube | Inferred relationship | Some |  | 
| Autopsy/dissection sink system | Is a | False | Tube | Inferred relationship | Some |  | 
| Examination/treatment room sink system (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Laboratory sink system | Is a | False | Tube | Inferred relationship | Some |  | 
| Mobile sink system (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Endotracheal tube adaptor | Is a | False | Tube | Inferred relationship | Some |  | 
| Extracorporeal blood gas/pH monitor | Is a | False | Tube | Inferred relationship | Some |  | 
| Bile collection bag | Is a | False | Tube | Inferred relationship | Some |  | 
| Suprapubic catheter/drain | Is a | False | Tube | Inferred relationship | Some |  | 
| Centrifugal circulatory assist pump, electric | Is a | False | Tube | Inferred relationship | Some |  | 
| Centrifugal circulatory assist pump, manual (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Venous-return circulatory assist system (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Ventricular circulatory assist system (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Intravenous line clamp | Is a | False | Tube | Inferred relationship | Some |  | 
| Intermittent venous compression system | Is a | False | Tube | Inferred relationship | Some |  | 
| Sequential venous compression system | Is a | False | Tube | Inferred relationship | Some |  | 
| Tube/mask breathing circuit connector, reusable | Is a | False | Tube | Inferred relationship | Some |  | 
| Tube/mask breathing circuit connector, single-use | Is a | False | Tube | Inferred relationship | Some |  | 
| Y-piece breathing circuit connector, reusable | Is a | False | Tube | Inferred relationship | Some |  | 
| Y-piece breathing circuit connector, single-use | Is a | False | Tube | Inferred relationship | Some |  | 
| Haemodialysis system blood pump | Is a | False | Tube | Inferred relationship | Some |  | 
| Vaginal douche, reusable | Is a | False | Tube | Inferred relationship | Some |  | 
| Thoracic drain | Is a | False | Tube | Inferred relationship | Some |  | 
| Closed-wound drainage kit, postcraniotomy | Is a | False | Tube | Inferred relationship | Some |  | 
| Pleural drainage system | Is a | False | Tube | Inferred relationship | Some |  | 
| Tracheostomy tube dressing | Is a | False | Tube | Inferred relationship | Some |  | 
| Pneumatic dental drilling system hose (physical object) | Is a | True | Tube | Inferred relationship | Some |  | 
| Enteral feeding kit, infant | Is a | False | Tube | Inferred relationship | Some |  | 
| Suction system filter, microbial | Is a | False | Tube | Inferred relationship | Some |  | 
| Airway tube forceps, reusable | Is a | False | Tube | Inferred relationship | Some |  | 
| Cardiopulmonary bypass system roller pump (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Hydraulic incontinence treatment system (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Infusion controller administration set | Is a | False | Tube | Inferred relationship | Some |  | 
| Ambulatory insulin infusion pump reservoir (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Scalp vein intravenous administration set | Is a | False | Tube | Inferred relationship | Some |  | 
| Urological irrigation system (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Oxygen therapy system (physical object) | Is a | False | Tube | Inferred relationship | Some |  | 
| Eustachian tube prosthesis | Is a | False | Tube | Inferred relationship | Some |  |