ablation instrument and system. An instrument (11) is provided which can be used in particular for large area ablation of the mucosa (84), in which case the instrument (11) comprises at least one first gas supply line (35a) and at least one second gas supply line (35b) whose distal ends (36a, b) are arranged to form an acute angle (a) such that the ends (36a, b) of the gas supply lines (35a, b) ) differ distally. between the distal ends (36a, b) of the gas supply lines (35a, b), there is provided a clearance (45) that allows the user of the instrument (11) to look through the clearance (45) between the distal ends (36a, b) of the gas supply lines (35a, b) to the tissue region (47) behind the distal end (21) of the instrument (11). Due to the acute angle (a), it is possible by means of electrodes (41a, b) which are arranged at least partially at the ends (36a, b) of the gas supply lines (35a, b) to generate a large beam. of plasma with which mucosal ablation can be performed. In doing so, the instrument (11) can be guided in particular and precisely because of the view through the free space (45). A connecting element (29) according to the invention is provided for securing the ends (36a, b) of the gas supply lines (35a, b).instrumento e sistema para ablação. é proporcionado um instrumento (11) que pode ser utilizado em particular para a ablação de grande área da mucosa (84), caso em que o instrumento (11) compreende pelo menos uma primeira linha de alimentação de gás (35a) e pelo menos uma segunda linha de alimentação de gás (35b) cujas extremidades distais (36a,b) estão dispostas de modo a formarem um ângulo agudo (a), de maneira que as extremidades (36a, b) das linhas de fornecimento de gás (35a, b) divergem distalmente. entre as extremidades distais (36a, b) das linhas de alimentação de gás (35a, b), é proporcionado um espaço livre (45) que permite ao usuário do instrumento (11) olhar através do espaço livre (45) entre as extremidades distais (36a, b) das linhas
