
der Eingriff
procedure
A medical treatment on the body, especially a surgical one.
Der Patient erholt sich gut von dem kleinen chirurgischen Eingriff.
The patient is recovering well from the small surgical procedure.
intervention / procedure
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procedure
A medical treatment on the body, especially a surgical one.
Der Patient erholt sich gut von dem kleinen chirurgischen Eingriff.
The patient is recovering well from the small surgical procedure.

intervention
An action that intervenes in existing rights, conditions, or processes and changes or disrupts them.
Das neue Überwachungsgesetz ist ein schwerwiegender Eingriff in die Privatsphäre der Bürger.
The new surveillance law is a serious intervention in citizens' privacy.

intervention
A technical change or manipulation of a device or system.
Jeder eigenmächtige Eingriff in die Maschine führt zum Erlöschen der Garantie.
Any unauthorized intervention in the machine will void the warranty.
The word 'Eingriff' (intervention/procedure) is derived from the verb 'eingreifen' (to intervene). It literally describes the action of 'reaching into' something and thereby changing it, whether it is a body, a right, or a technical system.
Der Arzt erklärte, dass der Eingriff notwendig sei.
The doctor explained that the procedure was necessary.
'Eingriff' (intervention) is very often used with the preposition 'in' followed by the accusative. This construction describes what the action affects.
Naturschützer kritisieren den Eingriff in das Ökosystem des Flusses.
Conservationists criticize the intervention in the river's ecosystem.
In a medical context, 'Eingriff' (procedure) is often combined with adjectives such as 'chirurgisch' (surgical), 'operativ' (operative), 'klein' (small), or 'groß' (major). A typical action is to 'sich einem Eingriff unterziehen' (to undergo a procedure).
Sie muss sich morgen einem kleinen chirurgischen Eingriff unterziehen.
She has to undergo a small surgical procedure tomorrow.
In a legal or political context, typical combinations are 'ein schwerwiegender Eingriff' (a serious intervention), 'ein unzulässiger Eingriff' (an unlawful intervention), or 'ein Eingriff in die Grundrechte' (an intervention in fundamental rights).
Das Gericht prüft, ob das Gesetz einen Eingriff in die Pressefreiheit darstellt.
The court is examining whether the law constitutes an intervention in freedom of the press.
treatment
Behandlung encompasses medical care as a whole and can consist of various measures. An Eingriff, by contrast, is a single, clearly defined medical procedure performed on the body, often an operation. An Eingriff can therefore be part of a longer Behandlung.

Der Eingriff am verletzten Knie dauert etwa eine Stunde.
The procedure on the injured knee takes about an hour.
Die Behandlung des verletzten Knies dauert mehrere Wochen.
Treatment of the injured knee takes several weeks.