1. Technical Field
The present invention relates to operation handles, and more generally to operation handles for electrocautery.
2. Related Art
During surgical operations, it is common to use surgical instruments such as scissors and jaw members to cut or clamp a patient's tissues. It is also common to use surgical instruments such as electrosurgical instruments for cutting, sealing or stopping bleeding of an affected part or a wound. Currently, there are many surgical instruments, such as electrocautery, with handles for doctors to operate intuitively when cutting or clamping.
FIGS. 1 and 2 show surgical instruments with jaw members. When a doctor wants to use jaw members a20 to clamp something, they may pull the second handle a30 close to the handle all. Meanwhile, the positioning cogs a321 and the locking cogs a61 are engaged with each other, so the second handle a30 may be locked at a fix position for the jaw members a20 to clamp something. At the same time, even if the doctor's hand is away from the second handle a30 and the handle all, the jaw members a20 continue clamping by the engagement of the positioning cogs a321 and the locking cogs a61.
When the doctor wants to release the clamping, they must press a pressing part a51 of a controlling element a50, so the locking cogs a61 may be released from the positioning cogs a321. At the same time, the doctor must move the second handle a30 away from the handle all. During an operation, four fingers of the doctor may be located at the handle all and the thumb may be located at the second handle a30 for the engagement by pulling the second handle a30. However, under the engagement release, one forefinger or one middle finger must press the pressing part a51. That is, the pressing part a51 is pressed toward to the second handle a30. However, the other three fingers remain located at the handle all to hold the handle all. At the same time, the thumb, located at the second handle a30, must move the second handle a30 backward away from the handle all.
As a result, the doctor must use one finger pressing forward and the other finger moving backward. Mastering such a release procedure requires repeated practice. Consequently, when the doctor first uses this kind of instrument, the learning curve required to develop skill with the instrument is high.