Trocar
First Claim
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1. A trocar comprisinga first housing;
- a stylet secured to and extending from said first housing, said stylet having a sharp tip at a distal end;
a protective tube slidably mounted in said first housing between an extended position and a retracted position, said protective tube being disposed concentrically about said stylet;
a spring in said first housing biasing said protective tube outwardly of said first housing into said extended position;
latch means in said first housing for locking said protective tube in said extended position;
a slider slidably mounted in and projecting from said first housing for releasing said latch means to permit movement of said protective tube into said retracted position;
a second housing coaxial of said first housing to define a handgrip therewith; and
a guide tube secured to and extending from said second housing with said protective tube slidably mounted therein, said slider projecting from said first housing against said second housing, whereby squeezing of said housings together pushes said slider into said first housing to release said latch means.
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Accused Products
Abstract
The trocar is provided with a leaf spring in the housing which abuts a collar on a protective tube which surrounds the sharp tip of the stylet. A spring finger extending from the leaf spring is actuated by a slider when the two housings of the trocar components are squeezed together. The spring finger initially lifts the leaf spring from the collar to release the protective tube for sliding proximally while the collar subsequently lifts the spring finger from the shoulder of the slider to prevent a re-release of the leaf spring when the protective tube 16 is moved back into the extended position.
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Citations
16 Claims
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1. A trocar comprising
a first housing; -
a stylet secured to and extending from said first housing, said stylet having a sharp tip at a distal end; a protective tube slidably mounted in said first housing between an extended position and a retracted position, said protective tube being disposed concentrically about said stylet; a spring in said first housing biasing said protective tube outwardly of said first housing into said extended position; latch means in said first housing for locking said protective tube in said extended position; a slider slidably mounted in and projecting from said first housing for releasing said latch means to permit movement of said protective tube into said retracted position; a second housing coaxial of said first housing to define a handgrip therewith; and a guide tube secured to and extending from said second housing with said protective tube slidably mounted therein, said slider projecting from said first housing against said second housing, whereby squeezing of said housings together pushes said slider into said first housing to release said latch means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a trocar, the combination comprising
a spring-biased tube movably mounted between an extended position and a retracted position; -
latch means for locking said tube in said extended position; and a slider for releasing said latch means to permit movement of said tube into said retracted position, said latch means including a leaf spring abutting said tube in said extended position and a spring finger extending from said leaf spring into abutment with said slider for lifting said leaf spring from said tube in response to movement of said slider into said first housing. - View Dependent Claims (10, 11, 12)
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13. In a trocar, the combination comprising
a housing; -
a stylet secured to and extending from said housing; a tube slidably mounted at a proximal end in said housing and extending concentrically about said stylet for movement between an extended position and a retracted postion; a collar on said proximal end of said tube; leaf spring in said housing abutting said collar to lock said tube in said extended position; a slider reciprocally mounted and projecting from said housing; and means extending between said slider and said leaf spring for releasing said leaf spring from said collar in response to proximal movement of said slider to permit proximal movement of said tube. - View Dependent Claims (14, 15)
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16. A latch comprising a one-piece body having a base, a leaf spring extending from one end of said base to define a U-shape, said leaf spring having a first portion of predetermined width extending from said base to an intermediate point and a second portion of reduced width extending to a distal end, and a spring finger extending angularly
from said first portion at said intermediate point of said leaf spring and outwardly of a free end of said leaf spring.
Specification