| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Epidural catheter maintenance | Direct device | False | Epidural catheter, device | Inferred relationship | Existential restriction modifier | 1 | 
| Epidural catheter maintenance | Direct device | True | Epidural catheter, device | Inferred relationship | Existential restriction modifier | 1 | 
| Side hole epidural catheter | Is a | True | Epidural catheter, device | Inferred relationship | Existential restriction modifier |  | 
| End hole epidural catheter | Is a | True | Epidural catheter, device | Inferred relationship | Existential restriction modifier |  | 
| Implantable epidural access system | Is a | True | Epidural catheter, device | Inferred relationship | Existential restriction modifier |  | 
| Insertion of catheter into lumbar epidural space | Direct device | False | Epidural catheter, device | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of catheter into cervical epidural space | Direct device | False | Epidural catheter, device | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of catheter into thoracic epidural space | Direct device | False | Epidural catheter, device | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of catheter into thoracic epidural space | Direct device | True | Epidural catheter, device | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of catheter into lumbar epidural space | Direct device | True | Epidural catheter, device | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of catheter into cervical epidural space | Direct device | True | Epidural catheter, device | Inferred relationship | Existential restriction modifier | 1 | 
| Epidural catheter care | Direct device | True | Epidural catheter, device | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of temporary catheter into thoracic epidural space | Direct device | True | Epidural catheter, device | Inferred relationship | Existential restriction modifier | 1 | 
| Insertion of temporary catheter into lumbar epidural space | Direct device | True | Epidural catheter, device | Inferred relationship | Existential restriction modifier | 1 | 
| Catheterisation of epidural space using ultrasonography guidance (procedure) | Direct device | True | Epidural catheter, device | Inferred relationship | Existential restriction modifier | 1 |