Surgical instrument with fluid fillable buttress

[0001] In some settings, endoscopic surgical instruments may be preferred over traditional open surgical devices since a smaller incision may reduce the post-operative recovery time and complications. Consequently, some endoscopic surgical instruments may be suitable for placement of a distal end effector at a desired surgical site through a cannula of a trocar. These distal end effectors may engage tissue in a number of ways to achieve a diagnostic or therapeutic effect (e.g., endocutter, grasper, cutter, stapler, clip applier, access device, drug/gene therapy delivery device, and energy delivery device using ultrasound, RF, laser, etc.). Endoscopic surgical instruments may include a shaft between the end effector and a handle portion, which is manipulated by the clinician. Such a shaft may enable insertion to a desired depth and rotation about the longitudinal axis of the shaft, thereby facilitating positioning of the end effector within the patient. Positioning of an end effector may be further facilitated through inclusion of one or more articulation joints or features, enabling the end effector to be selectively articulated or otherwise deflected relative to the longitudinal axis of the shaft.

[0002] Examples of endoscopic surgical instruments include surgical staplers. Some such staplers are operable to clamp down on layers of tissue, cut through the clamped layers of tissue, and drive staples through the layers of tissue to substantially seal the severed layers of tissue together near the severed ends of the tissue layers. Merely exemplary surgical staplers are disclosed in U.S. Pat. No. 4,805,823, entitled “Pocket Configuration for Internal Organ Staplers,” issued Feb. 21, 1989; U.S. Pat. No. 5,415,334, entitled “Surgical Stapler and Staple Cartridge,” issued May 16, 1995; U.S. Pat. No. 5,465,895, entitled “Surgical Stapler Instrument,” issued Nov. 14, 1995; U.S. Pat. No. 5,597,107, entitled “Surgical Stapler Instrument,” issued Jan. 28, 1997; U.S. Pat. No. 5,632,432, entitled “Surgical Instrument,” issued May 27, 1997; U.S. Pat. No. 5,673,840, entitled “Surgical Instrument,” issued Oct. 7, 1997; U.S. Pat. No. 5,704,534, entitled “Articulation Assembly for Surgical Instruments,” issued Jan. 6, 1998; U.S. Pat. No. 5,814,055, entitled “Surgical Clamping Mechanism,” issued Sep. 29, 1998; U.S. Pat. No. 6,978,921, entitled “Surgical Stapling Instrument Incorporating an E-Beam Firing Mechanism,” issued Dec. 27, 2005; U.S. Pat. No. 7,000,818, entitled “Surgical Stapling Instrument Having Separate Distinct Closing and Firing Systems,” issued Feb. 21, 2006; U.S. Pat. No. 7,143,923, entitled “Surgical Stapling Instrument Having a Firing Lockout for an Unclosed Anvil,” issued Dec. 5, 2006; U.S. Pat. No. 7,303,108, entitled “Surgical Stapling Instrument Incorporating a Multi-Stroke Firing Mechanism with a Flexible Rack,” issued Dec. 4, 2007; U.S. Pat. No. 7,367,485, entitled “Surgical Stapling Instrument Incorporating a Multistroke Firing Mechanism Having a Rotary Transmission,” issued May 6, 2008; U.S. Pat. No. 7,380,695, entitled “Surgical Stapling Instrument Having a Single Lockout Mechanism for Prevention of Firing,” issued Jun. 3, 2008; U.S. Pat. No. 7,380,696, entitled “Articulating Surgical Stapling Instrument Incorporating a Two-Piece E-Beam Firing Mechanism,” issued Jun. 3, 2008; U.S. Pat. No. 7,404,508, entitled “Surgical Stapling and Cutting Device,” issued Jul. 29, 2008; U.S. Pat. No. 7,434,715, entitled “Surgical Stapling Instrument Having Multistroke Firing with Opening Lockout,” issued Oct. 14, 2008; and U.S. Pat. No. 7,721,930, entitled “Disposable Cartridge with Adhesive for Use with a Stapling Device,” issued May 25, 2010. The disclosure of each of the above-cited U.S. Patents is incorporated by reference herein. While the surgical staplers referred to above are described as being used in endoscopic procedures, it should be understood that such surgical staplers may also be used in open procedures and/or other non-endoscopic procedures.

[0003] While various kinds of surgical stapling instruments and associated components have been made and used, it is believed that no one prior to the inventor(s) has made or used the invention described in the appended claims.

[0029] The drawings are not intended to be limiting in any way, and it is contemplated that various embodiments of the invention may be carried out in a variety of other ways, including those not necessarily depicted in the drawings. The accompanying drawings incorporated in and forming a part of the specification illustrate several aspects of the present invention, and together with the description serve to explain the principles of the invention; it being understood, however, that this invention is not limited to the precise arrangements shown.

[0030] The following description of certain examples of the invention should not be used to limit the scope of the present invention. Other examples, features, aspects, embodiments, and advantages of the invention will become apparent to those skilled in the art from the following description, which is by way of illustration, one of the best modes contemplated for carrying out the invention. As will be realized, the invention is capable of other different and obvious aspects, all without departing from the invention. Accordingly, the drawings and descriptions should be regarded as illustrative in nature and not restrictive.

[0031] I. Exemplary Surgical Stapler

[0032] FIGS. 1-6 depict an exemplary surgical stapling and severing instrument (10) that is sized for insertion, in a nonarticulated state as depicted in FIG. 1A, through a trocar cannula passageway to a surgical site in a patient for performing a surgical procedure. Surgical and stapling and severing instrument (10) includes handle portion (20) connected to implement portion (22), the latter further comprising shaft (23) distally terminating in an articulating mechanism (11) and a distally attached end effector (12). Once articulation mechanism (11) and distally end effector (12) are inserted through the cannula passageway of a trocar, articulation mechanism (11) may be remotely articulated, as depicted in FIG. 1B, by articulation control (13). Thereby, end effector (12) may reach behind an organ or approach tissue from a desired angle or for other reasons. It should be understood that terms such as “proximal” and “distal” are used herein with reference to a clinician gripping handle portion (20) of instrument (10). Thus, end effector (12) is distal with respect to the more proximal handle portion (20). It will be further appreciated that for convenience and clarity, spatial terms such as “vertical” and “horizontal” are used herein with respect to the drawings. However, surgical instruments are used in many orientations and positions, and these terms are not intended to be limiting and absolute.

[0033] End effector (12) of the present example includes a lower jaw (16) and a pivotable anvil (18). Handle portion (20) includes pistol grip (24) toward which closure trigger (26) is pivotally drawn by the clinician to cause clamping, or closing, of the anvil (18) toward lower jaw (16) of end effector (12). Such closing of anvil (18) is provided through an outmost closure sleeve (32), which longitudinally translates relative to handle portion (20) in response to pivoting of closure trigger (26) relative to pistol grip (24). A distal closure ring (33) of closure sleeve (32) is indirectly supported by frame (34) of implement portion (22). At articulation mechanism (11), a proximal closure tube (35) of closure sleeve (32) communicates with the distal portion (closure ring) (33). Frame (34) is flexibly attached to lower jaw (16) via articulation mechanism (11), enabling articulation in a single plane. Frame (34) also longitudinally slidingly supports a firing drive member (not shown) that extends through shaft (23) and communicates a firing motion from firing trigger (28) to firing bar (14). Firing trigger (28) is farther outboard of closure trigger (26) and is pivotally drawn by the clinician to cause the stapling and severing of clamped tissue in end effector (12), as will be described in greater detail below. Thereafter, release button (30) is depressed to release the tissue from end effector (12).

[0034] FIGS. 2-5 depict end effector (12) employing an E-beam firing bar (14) to perform a number of functions. As best seen in FIGS. 3A-3B, firing bar (14) includes a transversely oriented upper pin (38), a firing bar cap (44), a transversely oriented middle pin (46), and a distally presented cutting edge (48). Upper pin (38) is positioned and translatable within an anvil pocket (40) of anvil (18). Firing bar cap (44) slidably engages a lower surface of lower jaw (16) by having firing bar (14) extend through channel slot (45) (shown in FIG. 3B) that is formed through lower jaw (16). Middle pin (46) slidingly engages a top surface of lower jaw (16), cooperating with firing bar cap (44). Thereby, firing bar (14) affirmatively spaces end effector (12) during firing, overcoming pinching that may occur between anvil (18) and lower jaw (16) with a minimal amount of clamped tissue and overcoming staple malformation with an excessive amount of clamped tissue.

[0035] FIG. 2 shows firing bar (14) proximally positioned and anvil (18) pivoted to an open position, allowing an unspent staple cartridge (37) to be removably installed into a channel of lower jaw (16). As best seen in FIGS. 4-5, staple cartridge (37) of this example includes a cartridge body (70), which presents an upper deck (72) and is coupled with a lower cartridge tray (74). As best seen in FIG. 2, a vertical slot (49) is formed through part of staple cartridge (37). As also best seen in FIG. 2, three rows of staple apertures (51) are formed through upper deck (70) on one side of vertical slot (49), with another set of three rows of staple apertures (51) being formed through upper deck (70) on the other side of vertical slot (49). Referring back to FIGS. 3-5, a wedge sled (41) and a plurality of staple drivers (43) are captured between cartridge body (70) and tray (74), with wedge sled (41) being located proximal to staple drivers (43). Wedge sled (41) is movable longitudinally within staple cartridge (37); while staple drivers (43) are movable vertically within staple cartridge (37). Staples (47) are also positioned within cartridge body (70), above corresponding staple drivers (43). In particular, each staple (47) is driven vertically within cartridge body (70) by a staple driver (43) to drive staple (47) out through an associated staple aperture (51). As best seen in FIGS. 3A-3B and 5, wedge sled (41) presents inclined cam surfaces that urge staple drivers (43) upwardly as wedge sled (41) is driven distally through staple cartridge (37).

[0036] With end effector (12) closed as depicted in FIG. 3A, firing bar (14) is advanced in engagement with anvil (18) by having upper pin (38) enter a longitudinal anvil slot (42). A pusher block (80) is located at the distal end of firing bar (14), and is configured to engage wedge sled (41) such that wedge sled (41) is pushed distally by pusher block (80) as firing bar (14) is advanced distally through staple cartridge (37). During such firing, cutting edge (48) of firing bar (14) enters vertical slot (49) of staple cartridge (37), severing tissue clamped between staple cartridge (37) and anvil (18). As shown in FIGS. 3A-3B, middle pin (46) and pusher block (80) together actuate staple cartridge (37) by entering into a firing slot within staple cartridge (37), driving wedge sled (41) into upward camming contact with staple drivers (43) that in turn drive staples (47) out through staple apertures (51) and into forming contact with staple forming pockets (53) on the inner surface of anvil (18). FIG. 3B depicts firing bar (14) fully distally translated after completing severing and stapling tissue.

[0037] FIG. 6 shows end effector (12) having been actuated through a single stroke through tissue (90). As shown, cutting edge (48) has cut through tissue (90), while staple drivers (43) have driven three alternating rows of staples (47) through the tissue (90) on each side of the cut line produced by cutting edge (48). Staples (47) are all oriented substantially parallel to the cut line in this example, though it should be understood that staples (47) may be positioned at any suitable orientations. In the present example, end effector (12) is withdrawn from the trocar after the first stroke is complete, spent staple cartridge (37) is replaced with a new staple cartridge, and end effector (12) is then again inserted through the trocar to reach the stapling site for further cutting and stapling. This process may be repeated until the desired amount of cuts and staples (47) have been provided. Anvil (18) may need to be closed to facilitate insertion and withdrawal through the trocar; and anvil (18) may need to be opened to facilitate replacement of staple cartridge (37).

[0038] It should be understood that cutting edge (48) may sever tissue substantially contemporaneously with staples (47) being driven through tissue during each actuation stroke. In the present example, cutting edge (48) just slightly lags behind driving of staples (47), such that a staple (47) is driven through the tissue just before cutting edge (48) passes through the same region of tissue, though it should be understood that this order may be reversed or that cutting edge (48) may be directly synchronized with adjacent staples. While FIG. 6 shows end effector (12) being actuated in two layers (92, 94) of tissue (90), it should be understood that end effector (12) may be actuated through a single layer of tissue (90) or more than two layers (92, 94) of tissue. It should also be understood that the formation and positioning of staples (47) adjacent to the cut line produced by cutting edge (48) may substantially seal the tissue at the cut line, thereby reducing or preventing bleeding and/or leaking of other bodily fluids at the cut line. Various suitable settings and procedures in which instrument (10) may be used will be apparent to those of ordinary skill in the art in view of the teachings herein.

[0039] It should be understood that instrument (10) may be configured and operable in accordance with any of the teachings of U.S. Pat. No. 4,805,823; U.S. Pat. No. 5,415,334; U.S. Pat. No. 5,465,895; U.S. Pat. No. 5,597,107; U.S. Pat. No. 5,632,432; U.S. Pat. No. 5,673,840; U.S. Pat. No. 5,704,534; U.S. Pat. No. 5,814,055; U.S. Pat. No. 6,978,921; U.S. Pat. No. 7,000,818; U.S. Pat. No. 7,143,923; U.S. Pat. No. 7,303,108; U.S. Pat. No. 7,367,485; U.S. Pat. No. 7,380,695; U.S. Pat. No. 7,380,696; U.S. Pat. No. 7,404,508; U.S. Pat. No. 7,434,715; and/or U.S. Pat. No. 7,721,930. As noted above, the disclosures of each of those patents are incorporated by reference herein. Additional exemplary modifications that may be provided for instrument (10) will be described in greater detail below. Various suitable ways in which the below teachings may be incorporated into instrument (10) will be apparent to those of ordinary skill in the art. Similarly, various suitable ways in which the below teachings may be combined with various teachings of the patents cited herein will be apparent to those of ordinary skill in the art. It should also be understood that the below teachings are not limited to instrument (10) or devices taught in the patents cited herein. The below teachings may be readily applied to various other kinds of instruments, including instruments that would not be classified as surgical staplers. Various other suitable devices and settings in which the below teachings may be applied will be apparent to those of ordinary skill in the art in view of the teachings herein.

[0040] II. Exemplary Cover

[0041] FIGS. 7-9 show an exemplary staple cartridge (37) retainer cap (180), which may be attached to staple cartridge (37). It should be understood that retainer cap (180) may be configured and operable in accordance with any of the teachings of U.S. Pub. No. 2012/0080344, published Apr. 5, 2012, entitled “Implantable Fastener Cartridge Comprising a Support Retainer”, now abandoned, the entire disclosure of which is incorporated by reference herein. Retainer cap (180) is operable to prevent, or at least inhibit, a clinician's thumb, for example, from contacting the tips of staples (47) positioned within staple cartridge (37) when staple cartridge (37) is inserted into lower jaw (16) of end effector (12). In addition or in the alternative, it may prevent staples (47) from inadvertently falling out of the cartridge. Referring now to FIGS. 7 and 8, retainer cap (180) of the present example includes bottom surface (181) and top surface (182), which can provide a pushing surface for the clinician to apply a downward force thereto, for example. In one merely exemplary use, the clinician may grab handle portion (184) of retainer cap (180), align support portion (110) of staple cartridge (37) with lower jaw (16) of end effector (12), and at least partially insert staple cartridge (37) within lower jaw (16) of end effector (12). Thereafter, the clinician can completely seat staple cartridge (37) in lower jaw (16) of end effector (12) by applying the downward force to top surface (182) of retainer cap (180) which can transmit the downward force directly to support portion (110). In the present example, retainer cap (180) comprises proximal supports (187) which extend downwardly and contact deck surface (111) of the support portion. Retainer cap (180) further comprises distal support portion (183), which abuts nose (103). When a downward force is applied to retainer cap (180), the downward force can be transmitted through proximal supports (187) and/or distal support portion (183). In some exemplary versions, at least some of the supports may not be in contact with the top of support portion (110) before the downward force is applied to retainer cap (180); however, in some versions, retainer cap (180) can be operable to flex, or move, downwardly until retainer cap (180) touches the top of support portion (110). At such point, the downward flexure, or movement, of retainer cap (180) can be impeded, or at least substantially impeded, from flexing further.

[0042] As described above, retainer cap (180) can be attached to staple cartridge (37) and can be used to manipulate the position of staple cartridge (37). In some versions, retainer cap (180) can comprise any suitable number of gripping members which can be operable to releasably hold retainer cap (180) to support portion (110) of staple cartridge (37), for example. For instance, in the present example, retainer cap (180) comprises latch arms (188, 189). Latch arms (189) extend around the sides of nose (103) and engage bottom surface (109) (FIG. 7) of nose (103). Similarly, latch arms (188) extend around the sides of lock projections (108) extending from support portion (110) and engage the bottom surfaces of lock projections (108). These latch arms (188) are operable to position retainer cap (180) over the zone or region in which the staples (47) are stored within support portion (110). In any event, once staple cartridge (37) has been suitably positioned, retainer cap (180) can be detached from staple cartridge (37). Of course, any other suitable components or features may be used to provide releasable coupling of retainer cap (180) to staple cartridge (37). In some versions, the clinician may apply an upward lifting force to handle (184) in order to detach the distal end of retainer cap (180) from distal end (102) of staple cartridge (37). In at least one such embodiment, latch arms (188, 189) may flex outwardly as handle (184) is lifted upwardly such that latch arms (188, 189) may flex around lock projections (108) and nose (103), respectively. Thereafter, the proximal end of retainer cap (180) may be lifted away from proximal end (101) of staple cartridge (37) and retainer cap (180) may be moved away from staple cartridge (37). With retainer cap (180) removed and with staple cartridge (37) properly seated in lower jaw (16) of end effector (12), instrument (10) may then be used in a surgical procedure.

[0043] III. Exemplary Fillable Buttress

[0044] A buttress (200), as shown in FIGS. 10-13, may be used with the end effector portion of the exemplary surgical cutter shown in FIGS. 1-6. It will be appreciated that use of buttress (200) as will be described below may facilitate quicker recovery to the surgical site where tissue has been severed and stapled by, for example, stabilizing areas where staples (47) have been applied. In some exemplary versions, buttress (200) may be used with retainer cap (180) described above, or alternatively, buttress (200) may be used directly with surgical severing and stapling instrument (10) described above without the use of retainer cap (180).

[0045] FIG. 10 shows that buttress (200) comprises a first fluid fillable member (202) or bladder and a second fluid fillable member (204) or bladder. In some exemplary versions, first fluid fillable member (202) may be attached to anvil (18) by an adhesive and second fluid fillable member (204) may be attached to upper deck (72) of staple cartridge (37) positioned in lower jaw (16). In other exemplary versions, first fluid fillable member (202) and second fluid fillable member (204) may be adhered together and adhered to anvil (18). In other exemplary versions, first fluid fillable member (202) and second fluid fillable member (204) may be adhered together and adhered to upper deck (72) of staple cartridge (37). In some exemplary versions, rather than using an adhesive to attach first fluid fillable member (202) or second fluid fillable member (204) to anvil (18) and/or lower jaw (16), a clip or other suitable mechanical or liquid fastening system may be used as would be apparent to one of ordinary skill in the art in view of the teachings herein. The present example of FIG. 10 shows buttress (200) as it is about to be positioned between anvil (18) and lower jaw (16).

[0046] First fluid fillable member (202) and second fluid fillable member (204) contains a two-part liquid (220) such that when the two parts of liquid (220) come in contact with one another, as will be described below, they form a coagulant that buttresses the surgical site affected by surgical stapling and severing instrument (10) shown in FIGS. 1-6. In some exemplary versions, first fluid fillable member (202) is filled with fibrin while second fluid fillable member (204) is filled with thrombin, but it should be understood that any suitable material may be used. In some versions, first fluid fillable member (202) and second fluid fillable member (204) may both comprise liquid (220) that may be operable to buttress a surgical site without necessarily combining with another compound. In yet other exemplary versions, rather than two fluid fillable members, any suitable number of fluid fillable members may be used as would be apparent to one of ordinary skill in the art in view of the teachings herein. For example, three or more fluid fillable members may be used, or a single fluid fillable member may be used. Furthermore, buttress (200) may be prefilled with liquid (220) or alternatively the user or physician may fill buttress (200) with liquid (220) prior to use of surgical stapling and severing instrument (10). In some other exemplary versions, liquid (220) may comprise a hemostatic agent, a biologically safe glue, or any other suitable adhesive material as would be apparent to one of ordinary skill in the art in view of the teachings herein.

[0047] In the exemplary version, buttress (200) has a generally flat, rectangular shape configured to fit in between anvil (18) and lower jaw (16). Buttress (200) has a size at least slightly larger than the width of anvil (18) or lower jaw (16). In some exemplary versions, buttress (200) may have a size significantly larger than anvil (18) or lower jaw (16). However, any suitable shape or size for buttress (200) may be used as would be apparent to one of ordinary skill in the art in view of the teachings herein. Furthermore, buttress (200) comprises a semi self-supportive structure such that buttress (200) can maintain its generally flat shape when buttress (200) is not being compressed as will be discussed below.

[0048] FIGS. 11A-C show a side view of buttress (200) showing how liquid (220) contained within first fluid filled portion (202) and second fluid filled portion (204) may be urged out of buttress (200). In the exemplary version, buttress (200) may be placed between anvil (18) and lower jaw (16) wherein buttress (200) remains mostly flat as shown in FIG. 11A. As also seen in FIG. 11A, liquid (220) remains in a substantially unpressurized state. In some exemplary versions, buttress (200) may be preloaded to be placed between anvil (18) and lower jaw (16) such that buttress (200) adheres to staple cartridge (not shown) contained in lower jaw (16). In other exemplary versions, the user or physician can load buttress (200) between anvil (18) and lower jaw (16) prior to use in a surgical setting. For example, in some exemplary versions the user may remove retaining cap (180) described above in FIGS. 7-9 and replace retaining cap (180) with buttress (200) prior to clamping anvil (18) and lower jaw (16) around the tissue of the surgical site. In other merely exemplary versions, buttress (200) may be coupled to retaining cap (180), wherein retaining cap (180) is removed prior to use, leaving only buttress (200) between anvil (18) and lower jaw (16). Other configurations for buttress (200) and retaining cap (180) may be used as would be apparent to one of ordinary skill in the art in view of the teachings herein.

[0049] FIG. 11B shows buttress (200) as it would appear when clamped by anvil (18) and lower jaw (16) resulting in a compressed region (206) and a pressurized region (208). In pressurized region (208), liquid (220) is forced under pressure. As seen in FIG. 11B, anvil (18) and lower jaw (16) have been clamped tightly around buttress (200) prior to buttress (200) being severed or stapled.

[0050] As seen in FIG. 11C, phantom lines (210) show the outline of buttress (200) prior to anvil (18) and lower jaw (16) compressing buttress (200). Anvil (18) and lower jaw (16) may be clamped to sandwich buttress (200). Liquid (220) contained within buttress (200) remains pressurized in pressurized region (208). While FIGS. 11B-11C show pressurized region (208) on one side of compressed region (206), it will be appreciated that an opposite pressurized region (208) could be formed on an opposite side of compressed (206). Buttress (200) comprises a generally elastic material configured to expand such that pressurized region (208) may be filled with most or all of the fluid in buttress (208) without breaking or popping under pressure. Pressurized region (208) accordingly expands beyond the region defined by phantom lines (210) to accommodate the increase in pressure and liquid of pressurized region (208).

[0051] As cutting edge (48) discussed above in reference to FIGS. 1-6 severs tissue (90), cutting edge (48) also severs buttress (200) resulting in buttress (200) being severed as shown in FIG. 11C. Almost simultaneously, buttress (200) is also stapled, and buttress (200) is thus ruptured by staples (47), thereby allowing buttress (200) to begin releasing liquid (220). Upon severing of buttress (200), liquid (220) is urged out of pressurized region (208) of buttress (200) and into the tissue of the surgical area thereby aiding in buttressing tissue (90) once tissue (90) is severed and stapled. Furthermore, staples (47) are deployed which, as stated above, further rupture buttress (200), thereby allowing liquid (220) to be squeezed out through regions of buttress (200) ruptured by staples (47) as well. In some exemplary versions, buttress (200) may comprise a dissolvable material such that buttress (200) may be left in tissue (90) without harming the patient. In other exemplary versions, buttress (200) may be removed from the surgical site once liquid (220) is released from buttress (200).

[0052] FIGS. 12A-B show a front cross-sectional view of buttress (200) as it is being compressed between two layers of tissue (290). In some exemplary versions, buttress (200) may be sandwiched between tissue (290) or in some alternative versions, buttress (200) may be pressed against either the top surface or bottom surface of tissue (290). In some exemplary versions, the outer surface of buttress (200) may comprise an adhesive coating to allow buttress (200) to adhere to tissue (290) prior to release of liquid (220). FIG. 12B shows buttress (200) after being severed and stapled by staples (247) where pressurized region (208) containing liquid (220) urges liquid (220) through compressed region (206) into surrounding tissue (290). In some versions, liquid (220) may also be urged through ruptures caused by staples (247).

[0053] FIG. 13 shows surgical severing and stapling instrument (10) as it is being used to sever and staple tissue (90). As can be seen in the present example, buttress (200) has been severed between anvil (18) and lower jaw (16). Furthermore, liquid (220) has been urged from buttress (200) into the surrounding tissue (90). While liquid (220) may comprise any suitable liquid, in the present example, liquid (220) comprises a coagulant, such as, for example, fibrin and thrombin. Liquid (220), once urged from buttress (200) is operable to aid in coagulation of the portions of tissue (90) where staples (47) have been inserted into tissue (90).

[0054] IV. Exemplary Buttress with Fillable Region

[0055] FIGS. 14-16 show a buttress (300) that may be used with end effector (12) of the instrument (10) shown in FIGS. 1-6. Buttress (300) comprises a barrier portion (302) and an adhesive region (304). Barrier portion (302) extends around the outer perimeter of adhesive region (304) thereby defining a first half (306) and a second half (308) of buttress (300). First half (306) and second half (308) are positioned such that vertical slot (49) is positioned roughly between first half (306) and second half (308). A cut line (314) extends between first half (306) and second half (308) as seen in FIG. 15 such that cutting edge (48) may cut barrier portion (302) along cut line (314). Of course, cut line (314) may be omitted. For instance, buttress (300) may be provided in discrete pieces on each side of vertical slot (49). Furthermore, it will be appreciated that buttress (300) may be configured as a single unit without the use of separate halves (306, 308). Similarly, while a single buttress (300) is used in the present example, it should be understood that two or more buttresses (300) may be used as would be apparent to one of ordinary skill in the art in view of the teachings herein. For example, FIG. 15 shows a cross sectional view of tissue (90) being clamped between two buttresses (300)—one buttress (300) on deck (72) of cartridge (37) and one buttress (300) on the underside of anvil (18).

[0056] Buttress (300) of the present example is constructed of a foam material, though it should be understood that any suitable materials may be used. By way of example only, buttress (300) may comprise a bio-absorbable fabric. Adhesive region (304) comprises an adhesive (310) held within an adhesive layer membrane (312). Adhesive (310) may comprise any suitable adhesive material as would be apparent to one of ordinary skill in the art in view of the teachings herein. For example, adhesive (310) may comprise cyanoarylates, anti-microbial agents, and/or healing agents. In yet other exemplary versions, adhesive regions (304) of halves (306, 308) may comprise two or more agents such that adhesive properties are only activated when the agents are combined after halves (306, 308) are punctured. Other suitable materials for adhesive (310) will be apparent to one of ordinary skill in the art in view of the teachings herein. Membrane (312) connected to barrier portion (302) forms a bubble configured to hold a fluid adhesive (310). For example, FIG. 15 shows membrane (312) enclosing adhesive (310). Membrane (312) may be constructed of a bio-absorbable plastic and/or other bio-absorbable material. Membrane (312) may further be constructed of any suitable material as would be apparent to one of ordinary skill in the art in view of the teachings herein.

[0057] As noted above, barrier portion (302) forms a lip around adhesive region (304) such that any fluids in adhesive region (304) are held within the perimeter defined by barrier portion (302). For example, as shown in FIGS. 15-16, tissue (90) that is clamped between two buttresses (300) is positioned such that adhesive regions (304) face toward tissue (90). Anvil (18) is clamped against lower jaw (16) such that buttresses (300) squeeze tissue (90), thereby forming a seal between barrier portion (302) and tissue (90). As seen in FIG. 15, staples (47) pierce through membrane (312) of adhesive region (304). As a result, adhesive region (304) ruptures and adhesive (310) flows out. Barrier portion (302) has a cup-like shape configured to hold adhesive (310) against tissue (90) after adhesive (310) leaves adhesive region (304); while substantially preventing adhesive (310) from flowing out of buttress (300) to surrounding tissue. FIG. 16 shows adhesive (310) after it has flown out from adhesive region (304) and formed an adhesive layer (316). Also in FIG. 16, cutting edge (48) has sliced along cut line (314) severing tissue (90). It will be appreciated that staples (47) operably hold buttresses (300) pressed against tissue (90).

[0058] FIG. 17 shows an exemplary alternative version of buttress (400) having a plurality of adhesive regions (404) spaced apart within barrier portion (402). Adhesive regions (404) comprise plastic modules operable to burst when punctured and/or when sufficiently compressed. Each adhesive regions (404) has an adhesive (410) contained therein. It will be appreciated that all of the adhesive regions (404) need not necessarily contain the same adhesives (410). For example, some adhesive regions (404) may comprise one type of adhesive (410) and/or therapeutic material whereas other adhesive regions (404) may comprise a different type of adhesive (410) and/or therapeutic material. Of course, any other suitable medical fluids may be included in regions (404) in addition to or in lieu of adhesives.

[0059] FIG. 18 shows yet another exemplary version of buttress (500) having a foam region (504), with adhesive capsules (510) embedded and/or seeded into foam region (504). Foam region (504) is contained within barrier portion (502). Foam region (504) may substantially prevent adhesive capsules (510) from inadvertently leaving buttress (500) before buttress (500) is deployed at a surgical site. Foam region (504) may also substantially prevent adhesive that is released from capsules (510) from escaping the surgical site after buttress (500) is deployed at the surgical site. Furthermore, foam region (504) may substantially prevent the adhesive (510) of capsules (510) from sticking to anvil (18) and/or cartridge (18), before and/or after buttress (500) is deployed at the surgical site.

[0060] Adhesive capsules (510) may be constructed from any suitable method as would be apparent to one of ordinary skill in the art in view of the teachings herein. FIG. 19 shows one exemplary way of making adhesive capsules (510) using a capsule forming chamber (550). Chamber (550) comprises a dispenser (552) and coating medium (556). It will be appreciated that any non-reactive gas may be contained within chamber (550). Dispenser (552) dispenses adhesive material (554), which falls as adhesive drops before entering coating medium (556). Coating medium (556) may comprise a plastic, but any suitable material may be used as would be apparent to one of ordinary skill in the art in view of the teachings herein. Adhesive material (554) contacts coating medium (556) and becomes covered with a coating, thereby forming adhesive capsules (510) at the bottom of coating medium (556). Thereafter, adhesive capsules (510) may be removed from chamber (550) and placed into foam region (504) as shown in FIG. 18. Of course, adhesive capsules (510) may be formed from any other suitable method as would be apparent to one of ordinary skill in the art in view of the teachings herein.

[0061] It should be understood that any one or more of the teachings, expressions, embodiments, examples, etc. described herein may be combined with any one or more of the other teachings, expressions, embodiments, examples, etc. that are described herein. The following-described teachings, expressions, embodiments, examples, etc. should therefore not be viewed in isolation relative to each other. Various suitable ways in which the teachings herein may be combined will be readily apparent to those of ordinary skill in the art in view of the teachings herein. Such modifications and variations are intended to be included within the scope of the claims.

[0062] Versions of the devices described above may have application in conventional medical treatments and procedures conducted by a medical professional, as well as application in robotic-assisted medical treatments and procedures.

[0063] Versions of described above may be designed to be disposed of after a single use, or they can be designed to be used multiple times. Versions may, in either or both cases, be reconditioned for reuse after at least one use. Reconditioning may include any combination of the steps of disassembly of the device, followed by cleaning or replacement of particular pieces, and subsequent reassembly. In particular, some versions of the device may be disassembled, and any number of the particular pieces or parts of the device may be selectively replaced or removed in any combination. Upon cleaning and/or replacement of particular parts, some versions of the device may be reassembled for subsequent use either at a reconditioning facility, or by a user immediately prior to a procedure. Those skilled in the art will appreciate that reconditioning of a device may utilize a variety of techniques for disassembly, cleaning/replacement, and reassembly. Use of such techniques, and the resulting reconditioned device, are all within the scope of the present application.

[0064] By way of example only, versions described herein may be sterilized before and/or after a procedure. In one sterilization technique, the device is placed in a closed and sealed container, such as a plastic or TYVEK bag. The container and device may then be placed in a field of radiation that can penetrate the container, such as gamma radiation, x-rays, or high-energy electrons. The radiation may kill bacteria on the device and in the container. The sterilized device may then be stored in the sterile container for later use. A device may also be sterilized using any other technique known in the art, including but not limited to beta or gamma radiation, ethylene oxide, or steam.

[0065] Having shown and described various versions in the present disclosure, further adaptations of the methods and systems described herein may be accomplished by appropriate modifications by one of ordinary skill in the art without departing from the scope of the present invention. Several of such potential modifications have been mentioned, and others will be apparent to those skilled in the art. For instance, the examples, versions, geometrics, materials, dimensions, ratios, steps, and the like discussed above are illustrative and are not required. Accordingly, the scope of the present invention should be considered in terms of the following claims and is understood not to be limited to the details of structure and operation shown and described in the specification and drawings.