True multi-fire surgical stapler with buttress strip

Description

This application claims priority to U.S. Provisional Patent Application Ser. No. 61/183,353, filed on Jun. 2, 2009, which is herein incorporated by reference in its entirety.

FIELD OF THE INVENTION

The invention generally relates to surgical staplers and stapling.

BACKGROUND

An endocutter is a surgical tool that staples and cuts tissue to transect that tissue while leaving the cut ends hemostatic. An endocutter is small enough in diameter for use in minimally invasive surgery, where access to a surgical site is obtained through a trocar, port, or small incision in the body. A linear cutter is a larger version of an endocutter, and is used to transect portions of the gastrointestinal tract. A typical endocutter receives at its distal end a disposable single-use cartridge with several rows of staples, and includes an anvil opposed to the cartridge. During actuation of an endocutter, the cartridge fires all of the staples that it holds. In order to deploy more staples, the endocutter must be moved away from the surgical site and removed from the patient, after which the old cartridge is exchanged for a new cartridge. The endocutter is then reinserted into the patient. However, it can be difficult and/or time-consuming to located the surgical site after reinsertion. Further, the process of removing the endocutter from the patient after each use, replacing the cartridge, and then finding the surgical site again is tedious, inconvenient and time-consuming, particularly where a surgical procedure requires multiple uses of the endocutter.

In order to overcome these difficulties, Cardica, Inc. of Redwood City, Calif. has developed a true multi-fire endocutter that is capable of firing multiple times without the need to utilize single-use-cartridges. Such an endocutter is described in, for example, U.S. Patent Application Publication No. 2009/0065552, published on Mar. 12, 2009 (the “Endocutter Publication”), which is hereby incorporated by reference herein in its entirety.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of an exemplary end effector with a staple holder and an anvil.

FIG. 2 is a detail cutaway side view of an endocutter with a feeder belt and staples in a staple holder (showing the staples in two separate positions in time), and a buttress strip in an anvil.

The use of the same reference symbols in different figures indicates similar or identical items.

DETAILED DESCRIPTION

Referring to FIG. 1, an end effector 2 of a surgical stapler may include an anvil 4 connected to a staple holder 6. At least one of the anvil 4 and staple holder 6 is movable relative to the other. As one example, the anvil 4 is pivotally connected to the staple holder 6 at a pivot point 8, such that the anvil 4 can pivot from an open position (as seen in FIG. 1) to a closed position and back again. The end effector 2 may be connected to the distal end of a shaft 10 or other structure. The end effector 2 and shaft 10 may be configured as set forth in the Endocutter Publication, with the exception of any specific differences identified herein.

Referring also to FIG. 2, the staple holder 6 may be configured to hold at least part of at least one feeder belt 12 to which a plurality of staples 14 that are fixed to and frangibly separable therefrom. The feeder belt 12 and staples 14 may be substantially as set forth in the Endocutter Publication. Staple forming pockets 16 may be defined in the surface of the anvil 4 that faces toward the staple holder 6. In this way, as staples 14 are ejected from the staple holder 6, those staples 14 encounter corresponding staple forming pockets 16 on the surface of the anvil 4, urging those staples 14 to deform and close.

A separate buttress belt 20 may be provided in association with the anvil 4. The buttress belt 20 may be configured substantially in the same manner as the feeder belt 12, but without staples attached. Further, the buttress belt 20 may include apertures 22 defined therethrough. The apertures 22 in the buttress belt 20 are positioned relative to the feeder belt 12 such that, during deployment of the staples 14 from a first position 14a to the closed position 14b, the free end 15 of at least one staple 14 enters a corresponding aperture 22 in the buttress belt 20, moves above the buttress belt 20, then moves downward into and through another aperture 22 in the buttress belt 20. After the staple 14 is completely closed, it is locked onto the buttress belt 20, providing increased clamping strength in tissue.

The buttress belt 20 may be configured in any manner to hold staples 14 individually or in groups. As one example, the buttress belt 20 may be perforated, breakable or separable such that at least one staple 14 and its corresponding portion of the buttress belt 20 to which it is connected is separable from a remaining portion of the buttress belt 20. As another example, the buttress belt 20 holds two or more staples, and is separably connected to a more-proximal segment of the buttress belt 20. As another example, instead of the buttress belt 20, a strip with similar characteristics is utilized, where that strip is loaded onto the anvil 4, then replaced manually after it is used prior to the next firing. As another example, the buttress belt 20 may be fabricated from flexible buttress material, or from a different material than the feeder belt 12.

While the invention has been described in detail, it will be apparent to one skilled in the art that various changes and modifications can be made and equivalents employed, without departing from the present invention. It is to be understood that the invention is not limited to the details of construction, the arrangements of components, and/or the steps of performing anastomosis set forth in the above description or illustrated in the drawings. Therefore, the invention is not to be restricted or limited except in accordance with the following claims and their legal equivalents.