Extension and retraction mechanism for a hand-held device

A device comprising:

• a housing configured to be held in a hand of a user;
• a sliding element that moves within the housing;
• an extension lever that partially resides within the housing, extends out from the housing, and pivots about an extension pivot point attached to the housing, wherein:
• the extension lever is coupled to the sliding element via an extension link;
• a first end of the extension link pivots about an extension link pivot point located at a first end of the extension lever and a second end of the extension link pivots about a block pivot point attached to the sliding element;
• and
• the extension pivot point is different than the extension link pivot point;
• and
• a retraction lever that partially resides within the housing, extends out from the housing, and is directly coupled to the sliding element.

A system comprising:

• a generator that produces radio frequency energy for ablation;
• and
• a hand-held device coupled to the generator, wherein the hand-held device comprises:
• a housing configured to be held in a hand of a user;
• an ablation needle that slides within a catheter coupled to the housing, wherein the ablation needle is coupled to the generator and a sliding element;
• an extension lever that extends out from the housing and pivots about an extension pivot point attached to the housing, wherein the extension lever is coupled to the ablation needle and moves the ablation needle in a first direction;
• an extension link that couples the extension lever to the sliding element, wherein a first end of the extension link pivots about an extension link pivot point located at a first end of the extension lever and a second end of the extension link pivots about a block pivot point attached to the sliding element, and wherein the extension pivot point is different than the extension link pivot point;
• and
• a refraction lever that extends out from the housing, is coupled to the ablation needle, and moves the ablation needle in a second direction, wherein the retraction lever moves with the ablation needle in the first direction when the extension lever is moved in the second direction.