Retractable trocar for circular stapling instruments
Inventors
Assignees
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Publication Number
US-12458357-B2
Publication Date
2025-11-04
Expiration Date
Abstract
A trocar member for a circular stapling instrument includes a tubular housing and a tip member moveable relative to the tubular housing between an extended position and a retracted position. The tubular housing includes proximal and distal portions and defines a longitudinal passage. The tubular housing includes a flange configured for operable engagement with an anvil assembly. The tip member is disposed entirely within the tubular housing when in the retracted position.
Core Innovation
A retractable trocar member for a circular stapling instrument includes a tubular housing having proximal and distal portions and defining a longitudinal passage, with a flange configured for operable engagement with an anvil assembly. A tip member is moveable relative to the tubular housing between an extended position and a retracted position, and the tip member is disposed entirely within the tubular housing when in the retracted position.
The trocar member controls transition between extended and retracted positions with a tension spring and a latch mechanism having locked and unlocked states. The tip member is locked in the extended position during tissue positioning and then retracted fully within the housing, and in the unlocked state the latch mechanism permits tip retraction so the trocar member includes a first length in the extended position and a second, shorter length in the retracted position.
The arrangement links handle actuation to trocar retraction and describes that anvil attachment secures the center rod to the trocar flange. The retracted tip reduces intra-abdominal space needed to align and attach the anvil center rod to the trocar, while maintaining the ability to position the trocar and attach the anvil assembly for an anastomosis.
Claims Coverage
The independent claims are clm-00001, clm-00012, and clm-00020. Across these independent claims, the coverage centers on a trocar member for a circular stapling instrument with a tubular housing and flange for anvil engagement, a tip member movable between extended and retracted positions, and, in certain claims, an effective-length difference with retraction and a surgical stapling device architecture including an elongate body and a loading unit supporting the trocar.
Trocar member with tubular housing and flange for anvil engagement
A trocar member for a circular stapling instrument comprising a tubular housing having proximal and distal portions and defining a longitudinal passage, the tubular housing including a flange configured for operable engagement with an anvil assembly.
Tip member movable between extended and retracted positions
A tip member moveable relative to the tubular housing between an extended position and a retracted position, wherein the tip member is disposed entirely within the tubular housing when in the retracted position.
Trocar member with first and second effective lengths
A tip member moveable within the longitudinal passage of the tubular housing between an extended position and a retracted position, wherein the trocar member includes a first length when the tip member is in the extended position and a second, shorter length when the tip member is in the retracted position.
Surgical stapling device with elongate body and loading unit
A surgical stapling device comprising an elongate body having proximal and distal portions, a loading unit supported on the distal portion of the elongate body, and a trocar member extending through the loading unit.
Trocar member in the surgical stapling device with releasable anvil connection
The trocar member including a tubular housing and a tip member moveable relative to the tubular housing between an extended position and a retracted position, the tubular housing including a flange configured for releasable connection with an anvil assembly.
Overall, the independent claims cover a retractable trocar member and its integration into a circular surgical stapling system, with key inventive aspects being the tubular housing with a flange for engagement with anvil assembly, a tip member fully retracted within the housing, and, where claimed, an effective-length reduction when the tip is retracted.
Stated Advantages
Reduces intra-abdominal space needed to align and attach the anvil center rod to the trocar.
Provides a reduction in space with an example reduction of about 26.4%.
Documented Applications
Used as part of a circular stapling instrument to position the trocar and attach the anvil center rod to the trocar for an anastomosis.
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