WO2023150958A1

WO2023150958A1 - Curved stapling device with enhanced lockout

Info

Publication number: WO2023150958A1
Application number: PCT/CN2022/075808
Authority: WO
Inventors: Gainan SUN
Original assignee: Covidien Lp
Priority date: 2022-02-10
Filing date: 2022-02-10
Publication date: 2023-08-17

Abstract

A stapling device (10) includes a lockout assembly (100) that engages a thrust bar (38) of the stapling device (10) when a cartridge assembly (46) is not present in the stapling device (10) to prevent firing of the stapling device (10). The lockout assembly (100) and the thrust bar (38) can both be formed from high strength materials such as metal to minimize any likelihood of lockout failure.

Description

CURVED STAPLING DEVICE WITH ENHANCED LOCKOUT

FIELD

This disclosure is generally related to surgical stapling devices and, more particularly, to surgical stapling devices with firing lockout mechanisms.

BACKGROUND

Surgical stapling devices for applying rows of staples through compressed living tissue are known in the art and are commonly used for closure of tissue or organs prior to transection or resection of the tissue and for occlusion of organs during thoracic or abdominal procedures. Such stapling devices sometimes include a knife for transecting or resecting the tissue or organs simultaneously with application of the staples to the tissue.

Typically, stapling devices include an end effector that includes an anvil assembly, a cartridge assembly, an approximation assembly for moving the cartridge assembly in relation to the anvil assembly between spaced and clamped positions, and a drive member. The cartridge assembly includes a pusher, staples, and a knife. The drive member is movable to advance the pusher to eject the staples from the cartridge assembly into the anvil assembly to form the staples in tissue. The end effector may have a variety of configurations including linear, curved, or circular. In addition, the end effector may have a variety of orientations including orientations parallel to a longitudinal axis of the stapling device and orientations transverse to the longitudinal axis of the stapling device.

Typically, stapling devices having an end effector that has an orientation that is transverse to the longitudinal axis of the stapling device, i.e., transverse stapling devices, include a clamp slide and a thrust bar. The clamp slide defines a pocket that releasably receives the cartridge assembly and is movable from a retracted position to an advanced position to move the cartridge assembly in relation to the anvil assembly between unclamped and clamped positions. When the cartridge assembly is in the clamped position, the stapling device can be fired to advance the thrust bar from a retracted position to an advanced position to advance the pusher and the knife to eject the staples from the cartridge assembly and resect or transect tissue. After the stapling device is fired, a lockout member moves from an unlocked position to a locked position to prevent refiring of the stapling device with a spent cartridge assembly, i.e., a cartridge assembly that has been fired and is devoid of staples.

A continuing need exists in the art for a surgical stapling device having a lockout assembly that prevents firing of the stapling device when a cartridge assembly is not present in the stapling device or when the cartridge assembly is spent.

SUMMARY

This disclosure is directed to a stapling device that includes a lockout assembly that engages a thrust bar of the stapling device when a cartridge assembly is not present in the stapling device, or when a spent staple cartridge assembly is present in the stapling device, to prevent firing of the stapling device.

Aspects of this disclosure are directed to a stapling device including a handle assembly, an elongate body having a proximal portion and a distal portion, a thrust bar having a proximal portion and a distal portion, a clamp slide, an end effector, and a lockout assembly. The handle assembly has a trigger that is movable through an actuation stroke. The proximal portion of the thrust bar is positioned within the handle assembly and is operably associated with the trigger such that movement of the trigger through the actuation stroke moves the thrust bar between retracted and advanced positions. The distal portion of the thrust bar includes a stop member. The clamp slide has a distal portion that defines a channel that receives the distal portion of the thrust bar. The end effector includes an end effector frame and a cartridge assembly. The end effector frame has a distal transverse portion, a proximal transverse portion, and a longitudinal portion that connects the distal transverse portion in spaced relation to the proximal transverse portion. The cartridge assembly is releasably received in the channel of the clamp slide and includes a cartridge body, a knife holder, a knife, a staple pusher, and staples. The cartridge body has a distal surface and defines a cavity, a knife slot, and staple receiving pockets that extend from the cavity to the distal surface of the cartridge body. Each of the staples is received within one of the staple receiving pockets. The knife is supported on and extends distally from the knife holder, and the knife holder and the staple pusher are received within the cavity of the cartridge body and are movable from retracted positions to advanced positions. The lockout assembly includes a lockout member that is movable from an unlocked position to a locked position. In the locked position, the lockout member is positioned to engage the stop member of the thrust bar to prevent movement of the thrust bar from its retracted position to its advanced position.

Other aspects of the disclosure are directed to a stapling device including a thrust bar, a clamp slide, an end effector, and a lockout assembly. The thrust bar has a distal portion and a proximal portion and is movable between retracted and advanced positions. The distal portion of the thrust bar includes a stop member. The clamp slide has a distal portion that defines a channel that receives the distal portion of the thrust bar. The end effector includes an end effector frame and a cartridge assembly. The end effector frame has a distal transverse portion, a proximal transverse portion, and a longitudinal portion that connects the distal transverse portion in spaced relation to the proximal transverse portion. The cartridge assembly is releasably received in the channel of the clamp slide and includes a cartridge body, a staple pusher, and staples. The cartridge body has a distal surface and defines a cavity and staple receiving pockets that extend from the cavity to the distal surface. Each of the staples is received within one of the staple receiving pockets. The staple pusher is received within the cavity of the cartridge body and is movable from a retracted position to an advanced position. The lockout assembly includes a lockout member that is movable from an unlocked position to a locked position. In the locked position, the lockout member is positioned to engage the stop member of the thrust bar to prevent movement of the thrust bar from its retracted position to its advanced position.

In aspects of the disclosure, the lockout assembly includes a biasing member that is positioned to urge the lockout member towards the locked position.

In some aspects of the disclosure, the lockout member and the thrust bar are formed of metal.

In certain aspects of the disclosure, the longitudinal portion of the end effector frame defines a frame cavity, and the lockout member is positioned within the frame cavity.

In aspects of the disclosure, the lockout assembly includes a pivot member that pivotably couples the lockout member to the end effector frame.

In some aspects of the disclosure, the lockout member includes an abutment member that is positioned to engage the staple pusher when the staple pusher is in the retracted position to move the lockout member to the unlocked position.

In certain aspects of the disclosure, the staple pusher includes a camming surface that is positioned to engage the abutment member of the lockout member when the cartridge assembly is loaded onto the clamp slide to move the lockout member from the locked position to the unlocked position.

In aspects of the disclosure, the knife holder defines a transverse slot, and the distal portion of the thrust bar includes a guide protrusion that is received within the transverse slot of the knife holder to couple the thrust bar to the knife holder.

In some aspects of the disclosure, the stapling device includes an anvil assembly that is supported on the distal transverse portion of the end effector frame.

In certain aspects of the disclosure, the anvil assembly includes an anvil plate and a cut member.

In aspects of the disclosure, the anvil plate defines a knife slot, and the cut member includes a raised rib that extends through the knife slot and is aligned with the knife slot in the cartridge body of the cartridge assembly.

In some aspects of the disclosure, the stapling device includes a guide member that is supported on the end effector frame and includes a transverse portion and a longitudinal portion.

In certain aspects of the disclosure, the transverse portion of the guide member is supported on the distal transverse portion of the end effector frame and the longitudinal portion of the guide member is supported on the longitudinal portion of the end effector frame.

In aspects of the disclosure, the cut plate of the anvil assembly is supported on a distal side of the transverse portion of the guide member and the anvil plate is supported on a proximal side of the transverse portion of the guide member.

Other features of the disclosure will be appreciated from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS

Various aspects of the disclosure are described herein below with reference to the drawings, wherein:

FIG. 1 is a side perspective view of a stapling device according to aspects of the disclosure in an unclamped, pre-fired position with a cartridge assembly separated from an end effector of the stapling device;

FIG. 2 is a side perspective view of the end effector of the surgical stapling device shown in FIG. 1 without the cartridge assembly;

FIG. 3 is an exploded view of the end effector shown in FIG. 2;

FIG. 4 is an enlarged view of the indicated area of detail shown in FIG. 1 illustrating a proximal portion of the end effector with an end effector frame of the end effector shown in phantom;

FIG. 5 is a side perspective view of a thrust bar of the stapling device shown in FIG. 1;

FIG. 6 is an enlarged view of the indicated area of detail shown in FIG. 1 illustrating the cartridge assembly;

FIG. 7 is a side perspective view of a pusher and staples of the cartridge assembly shown in FIG. 6;

FIG. 8 is a cross-sectional view taken along section line 8-8 of FIG. 1;

FIG. 9 is a side perspective view of the end effector of the stapling device shown in FIG. 1 loaded with a cartridge assembly in an unclamped, pre-fired position;

FIG. 10 is a cross-sectional view taken along section line 10-10 of FIG. 9; and

FIG. 11 is a cross-sectional view of the end effector shown in FIG. 9 with a spent cartridge assembly.

DETAILED DESCRIPTION

The disclosed stapling device will now be described in detail with reference to the drawings in which like reference numerals designate identical or corresponding elements in each of the several views. However, it is to be understood that aspects of the disclosure are merely exemplary of the disclosure and may be embodied in various forms. Well-known functions or constructions are not described in detail to avoid obscuring the disclosure in unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the disclosure in virtually any appropriately detailed structure.

In this description, the term “proximal” is used generally to refer to that portion of the device that is closer to a clinician during use of the stapling device in its customary manner, and the term “distal” is used generally to refer to that portion of the device that is farther from the clinician during use of the stapling device in its customary manner. In addition, the term “clinician” is used generally to refer to medical personnel including doctors, nurses, and support personnel. Further, directional terms such as front, rear, upper, lower, top, bottom, and similar terms are used to assist in understanding the description and are not intended to limit the disclosure.

This disclosure is directed to a stapling device that includes a lockout assembly that engages a thrust bar of the stapling device when a cartridge assembly is not present in the stapling device, or when a spent staple cartridge assembly is present in the stapling device, to prevent firing of the stapling device. The lockout assembly and the thrust bar may be both formed from high strength materials that resist fracture, e.g., metal, to minimize any likelihood of lockout assembly failure.

FIG. 1 illustrates a surgical stapling device according to aspects of the disclosure shown generally as stapling device 10. The stapling device 10 includes a handle assembly 12, an elongate body 14 that extends distally from the handle assembly 12, and an end effector 16 that is supported on a distal portion of the elongate body 14. The elongate body 14 defines a longitudinal axis “X” . The handle assembly 12 includes a housing 18 that defines a stationary handle 20 and supports a movable trigger 22. In aspects of the disclosure, the trigger 22 is supported by the housing 18 to pivot towards the stationary handle 20 between non-actuated and actuated positions to actuate the end effector 16, i.e., move the end effector 16 between unclamped and clamped positions and fire the stapling device 10. The handle assembly 12 includes two buttons 26 (only one is shown) , one on each side of the housing 18, that are movable along the housing 18 to advance and retract an alignment pin pusher 30 of the stapling device 10. The handle assembly 12 also includes a release button 28 that can be depressed to move the end effector 16 from the clamped position to the unclamped position. For a more detailed description of suitable handle assembly 12 including features identified herein, see, e.g., U.S. Patent No. 6,817,508 ( “the ’508 Patent” ) .

The stapling device 10 includes a frame 32 that extends distally from the handle assembly 12 and includes a distal portion 32a that supports the end effector 16. The frame 32 includes spaced frame members 34 that define a channel 36 that receives a thrust bar 38 (FIG. 5) . The thrust bar 38 is movable within the channel 36 between retracted and advanced positions in response to movement of the trigger 22 through a firing stroke to actuate the stapling device 10. The channel 36 also receives a proximal portion of a clamp slide 40 (FIG. 2) that extends from the handle assembly 12 into the end effector 16 and includes a distal portion 40a that defines a curved channel 42 (FIG. 2) . The thrust bar 38 has a distal portion 38a (FIG. 5) that is positioned within the curved channel 42 of the clamp slide 40.

FIGS. 2 and 3 illustrate the end effector 16 which includes an end effector frame 44 (FIG. 3) and a cartridge assembly 46. The cartridge assembly 46 is releasably received within the curved channel 42 in the distal portion 40a of the clamp slide 40. When the cartridge assembly 46 is received within the curved channel 42 of the clamp slide 40, the distal portion 38a of the thrust bar 38 engages the cartridge assembly 46. In aspects of the disclosure, the cartridge assembly 42 is movable with the clamp slide 40 in response to movement of the trigger 22 through a clamping stroke between retracted and advanced positions. For a more detailed description of the interaction between the trigger 22, the thrust bar 38, and the clamp slide 40, see the ’508 Patent.

The end effector 16 includes a curved end effector frame 44 that includes a distal or first transverse portion 44a, a proximal or second transverse portion 44b, and a longitudinal portion 44c that connects the first and second

transverse portions

44a and 44b together. The distal transverse portion 44a of the end effector frame 16a supports an anvil assembly 50. The clamp slide 40 and the cartridge assembly 46 are movable in relation to the anvil assembly 50 between unclamped and clamped positions. In some aspects of the disclosure, the end effector frame 44, the cartridge assembly 46, and the anvil assembly 50 have curved configurations along axes transverse to the longitudinal axis “X” of the elongate body 14.

The anvil assembly 50 (FIG. 3) is supported on a guide member 52 and includes an anvil plate 54 and a cut member 56. The guide member 52 includes a longitudinal portion 58 that is supported on the longitudinal portion 44c of the end effector frame 44 and a transverse portion 60 that is supported on the first transverse portion 44a of the end effector frame 44. The guide member 52 defines a channel 64 (FIG. 3) that extends along a proximally facing surface of the longitudinal portion 58 and a proximally facing surface of the transverse portion 60 and receives the end effector frame 44. The channel 64 in the guide member 52 fixedly positions the guide member 52 on the end effector frame 44.

The longitudinal portion 58 of the guide member 52 defines an inwardly facing channel 66 (FIG. 3) and includes a rib 68 that extends longitudinally within the channel 66. The rib 68 is received within the cartridge assembly 46 when the cartridge assembly 46 is loaded onto the end effector frame 44. The rib 68 and the channel 66 of the guide member 52 guide the cartridge assembly 46 as the cartridge assembly 46 moves between the unclamped and clamped positions. The longitudinal portion 58 of the guide member 52 also defines an opening 70 (FIG. 3) that will be described in further detail below.

The transverse portion 60 of the guide member 52 defines a transverse slot 72 (FIG. 3) that is centrally located within the channel 64 of the guide member 52. The cut member 56 includes a raised rib 74 (FIG. 3) that extends proximally through the transverse slot 72. The anvil plate 54 (FIG. 3) is received on a distal surface of the transverse portion 60 of the guide member 52 and defines a knife slot 76 that is aligned with the transverse slot 72 of the transverse portion 60 of the guide member 52. The raised rib 74 of the cut member 56 extends through the transverse slot 72 and into the knife slot 76 of the anvil plate 54 and is positioned to engage a knife 128 (FIG. 10) of the cartridge assembly 46 when the stapling device 10 is fired as described in further detail below.

In aspects of the disclosure, the anvil plate 52 includes flexible brackets 82 (FIG. 3) that extend through openings 84 in the guide member 52. Each of the brackets 82 defines an opening 86 (FIG. 3) that receives a protrusion (not shown) formed on the first transverse portion 44a of the end effector frame 44 in snap-fit fashion to secure the anvil plate 54 and the guide member 52 to the end effector frame 44.

The longitudinal portion 44c of the end effector frame 44 defines a cavity 90 (FIG. 3) that extends longitudinally along the end effector frame 44. The end effector 16 (FIG. 1) includes a lockout assembly 100 that is received within the cavity 90 and includes a lockout member 102, a pivot pin 104, and a biasing member 106. The lockout member 102 includes a distal portion 108 (FIG. 3) that is secured to the longitudinal portion 44a of the end effector frame 44 within the cavity 90 with the pivot pin 104 such that a proximal portion 110 of the lockout member 102 can pivot between unlocked and locked positions. The lockout member 102 includes a centrally located, inwardly extending abutment member 112 that extends through the opening 70 (FIG. 3) in the longitudinal portion 58 of the guide member 52. The biasing member 106 is positioned within the cavity 90 between the longitudinal portion 44c of the end effector frame 44 and the lockout member 102 to urge the lockout member 102 towards the locked position. In aspects of the disclosure, the biasing member 106 includes a leaf spring that includes flexible tabs 114 (FIG. 3) that are received in recesses (not shown) in the longitudinal portion 44c of the end effector frame 44 to secure the biasing member 106 in snap-fit fashion within the cavity 90 of the longitudinal portion 44c of the end effector frame 44.

FIGS. 4 and 5 illustrate the thrust bar 38 and the lockout member 102 (FIG. 4) . As described above, the thrust bar 38 includes a distal portion 38a that is received within the curved channel 42 (FIG. 2) of the clamp slide 40 within the end effector 16. The distal portion 38a of the thrust bar 38 includes a stop member 120 and a guide protrusion 122 (FIG. 4) . The stop member 120 projects outwardly from a body 38b of the distal portion 38a of the thrust bar 38. When the lockout member 102 is in the locked position (FIG. 4) , the lockout member 102 is positioned to engage the stop member 120 of the thrust bar 38 to prevent advancement of the thrust bar 38. In aspects of the disclosure, the thrust bar 38 and the lockout member 102 are both formed of metal, such as stainless steel, to provide a reliable lockout assembly for the stapling device 10.

The thrust bar 38 includes an elongate body 38b that extends through the channel 36 (FIG. 1) defined between the spaced frame members 34 of the elongate body 14 into the handle assembly 12. The thrust bar 38 is coupled to the trigger 22 such that movement of the trigger 22 (FIG. 1) through a firing stroke advances the thrust bar 38 towards the advanced position.

FIGS. 6 and 7 illustrate the cartridge assembly 46 which includes a cartridge body 124, a knife holder 126 (FIG. 6) , a knife 128 (FIG. 10) , a staple pusher 130 (FIG. 7) , and staples 132. The cartridge body 124 defines a cavity 134 (FIG. 6) and includes a distal surface 136. The staple pusher 130 and the knife holder 126 are positioned within the cavity 134 of the cartridge body 124 and are movable between retracted and advanced positions. The cartridge body 124 defines a knife slot 140 and staple receiving pockets 142 that are positioned in rows on each side of the knife slot 140. The knife slot 140 and the staple receiving pockets 142 extend from the cavity 134 and open onto the distal surface 136 of the cartridge body 134.

Each of the staples 132 is received within one of the staple receiving pockets 142 of the cartridge body 124 and is engaged with the staple pusher 130 such that movement of the staple pusher 130 from the retracted position to the advanced position within the cavity 134 of the cartridge body 124 ejects the staples 132 from the staple receiving pockets 142 of the cartridge body 124. In aspects of the disclosure, the staple pusher 130 includes a curved base portion 143 (FIG. 7) and a plurality of fingers 146 that extend distally from the curved base portion 143 and are received within the staple receiving pockets 142 of the cartridge body 124. The curved base portion defines a knife slot 144 and includes a lockout cam surface 148 (FIG. 7) .

The knife holder 126 supports the knife 128 (FIG. 9) and is movable within the cavity 134 of the cartridge body 124 between retracted and advanced positions. The knife holder 126 (FIG. 6) is positioned proximally of the staple pusher 130 and the knife 128 extends distally from the knife holder 126 through the knife slot 144 of the staple pusher 130 such that advancement of the knife holder 126 within the cavity 134 of the cartridge body 124 advances the knife 128 and the staple pusher 130 of the cartridge body 124 within the cavity 134. The knife 128 is aligned with the knife slot 140 in the cartridge body 134 and passes through the knife slot 140 when the knife holder 126 is advanced. As the knife moves to the advanced position, the knife 128 moves into engagement with the cut member 56 (FIG. 3) of the anvil assembly 50. It is noted that the knife holder 126 moves into abutting relation with the staple pusher 130 but is not coupled to the staple pusher 130. A such, when the knife holder 126 returns from the advanced position to the retracted position, the staple pusher 130 remains in the advanced position.

The knife holder 126 includes a transverse slot 160 (FIG. 6) . When the cartridge assembly 46 is inserted into the curved channel 42 in the distal portion 40a of the clamp slide 40, the guide protrusion 122 of the thrust bar 38 is received within the transverse slot 160 of the knife holder 126 to couple the knife holder 126 to the thrust bar 38. When the trigger 22 (FIG. 1) is moved through a firing stroke, the thrust bar 38 is advanced to advance the knife holder 126, the knife 128, and the staple pusher 130 within the cavity 134 of the cartridge body 124 to eject the staples 132 from the cartridge body 124 and advance the knife 128 from the cavity 134 through the knife slot 140 of the cartridge body 124 into the cut member 56 of the anvil assembly 50.

FIG. 8 illustrates a cross-sectional view taken through a portion of the end effector 16 with the cartridge assembly 46 removed from the curved channel 42 (FIG. 2) of the clamp slide 40. In this position, the biasing member 106 of the lockout assembly 100 urges the proximal portion 110 of the lockout member 102 upwardly about the pivot member 104 to the locked position in which the proximal portion 110 of the lockout member 102 is in the path of the stop member 120 of the thrust bar 38 to prevent advancement of the thrust bar 38. As illustrated, the abutment member 112 of the lockout member 102 of the lockout assembly 100 projects inwardly from the longitudinal portion 44c of the end effector frame 44 through the opening 70 in the guide member 52.

FIGS. 9 and 10 illustrate the end effector 16 of the stapling device 10 (FIG. 1) with the cartridge assembly 46 supported within the curved channel 42 (FIG. 8) of the clamp slide 40. When a fresh cartridge assembly 46 is loaded onto the stapling device 10 (FIG. 1) , the lockout cam surface 148 (FIG. 7) on the staple pusher 130 engages the abutment member 112 of the lockout member 102 to move or pivot the lockout member 102 outwardly in the direction of arrow “A” in FIG. 10 to move the proximal portion 110 of the lockout member 102 to the unlocked position. In the unlocked position, the proximal portion 110 of the lockout member 102 is positioned outwardly of the stop member 120 of the thrust bar 38 to facilitate movement of the thrust bar 38 from the retracted position to the advanced position. As stated above, the thrust bar is coupled to the knife holder 128 such that advancement of the thrust bar 128 advances the knife holder 128 and the pusher 130 through the cartridge body 124 to eject staples 132 from the cartridge body 124 and advance the knife 128 through the knife slot 140 of the cartridge body 124. Thus, when a new cartridge assembly 46 is loaded onto the stapling device 10 (FIG. 1) , the lockout member 102 is moved to the unlocked position to place the stapling device 10 in a position to be fired.

FIG. 11 illustrates a portion of the end effector 16 (FIG. 1) of the stapling device 10 after the stapling device 10 has been fired and the thrust bar 38 has returned to its retracted position. In this position, the staple pusher 130 which remains in its advanced position after the stapling device 10 is fired does not engage the abutment member 112 of the lockout member 102. As such, the lockout member 102 is urged by the biasing member 106 to the locked position. As described above, in the locked position, the proximal portion 110 of the lockout member 102 is positioned in the path of the stop member 120 of the thrust bar 38 to prevent readvancement of the thrust bar 38.

Persons skilled in the art will understand that the devices and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary aspects of the disclosure. It is envisioned that the elements and features illustrated or described in connection with one exemplary embodiment may be combined with the elements and features of another without departing from the scope of the present disclosure. As well, one skilled in the art will appreciate further features and advantages of the disclosure based on the above-described aspects of the disclosure. Accordingly, the disclosure is not to be limited by what has been particularly shown and described, except as indicated by the appended claims.

Claims

A stapling device comprising:

a handle assembly having a trigger that is movable through an actuation stroke;

an elongate body having a proximal portion and a distal portion;

a thrust bar having a distal portion and a proximal portion, the proximal portion of the thrust bar positioned within the handle assembly and operably associated with the trigger such that movement of the trigger through the actuation stroke moves the thrust bar between retracted and advanced positions, the distal portion of the thrust bar including a stop member;

a clamp slide having a distal portion defining a channel, the distal portion of the thrust bar received within the channel of the distal portion of the clamp slide;

an end effector including:

an end effector frame having a distal transverse portion, a proximal transverse portion, and a longitudinal portion, the longitudinal portion connecting the distal transverse portion in spaced relation to the proximal transverse portion; and

a cartridge assembly releasably received in the channel of the clamp slide, the cartridge assembly including a cartridge body, a knife holder, a knife, a staple pusher, and staples, the cartridge body having a distal surface and defining a cavity, a knife slot, and staple receiving pockets that extend from the cavity to the distal surface of the cartridge body, each of the staples received within one of the staple receiving pockets, the knife supported on and extending distally from the knife holder, the knife holder and the staple pusher received within the cavity of the cartridge body and movable from retracted positions to advanced positions; and

a lockout assembly including a lockout member that is movable from an unlocked position to a locked position, wherein in the locked position, the lockout member is positioned to engage the stop member of the thrust bar to prevent movement of the thrust bar from its retracted position to its advanced position.
The stapling device of claim 1, wherein the lockout assembly includes a biasing member that is positioned to urge the lockout member towards the locked position.
The stapling device of claim 2, wherein the lockout member and the thrust bar are formed of metal.
The stapling device of claim 3, wherein the longitudinal portion of the end effector frame defines a frame cavity, and the lockout member is positioned within the frame cavity.
The stapling device of claim 4, wherein the lockout assembly includes a pivot member, and the pivot member pivotably couples the lockout member to the end effector frame.
The stapling device of claim 3, wherein the lockout member includes an abutment member, the abutment member positioned to engage the staple pusher when the staple pusher is in the retracted position to move the lockout member to the unlocked position.
The stapling device of claim 6, wherein the staple pusher includes a camming surface that is positioned to engage the abutment member of the lockout member when the cartridge assembly is loaded onto the clamp slide to move the lockout member from the locked position to the unlocked position.
The stapling device of claim 3, wherein the knife holder defines a transverse slot, and the distal portion of the thrust bar includes a guide protrusion that is received within the transverse slot of the knife holder to couple the thrust bar to the knife holder.
The stapling device of claim 1, further including an anvil assembly supported on the distal transverse portion of the end effector frame.
The stapling device of claim 9, wherein the anvil assembly includes an anvil plate and a cut member, the anvil plate defining a knife slot and the cut member including a raised rib that extends through the knife slot, the raised rib aligned with the knife slot in the cartridge body of the cartridge assembly.
The stapling device of claim 10, further including a guide member supported on the end effector frame, the guide member including a transverse portion and a longitudinal portion, the transverse portion of the guide member supported on the distal transverse portion of the end effector frame and the longitudinal portion of the guide member supported on the longitudinal portion of the end effector frame.
The stapling device of claim 11, wherein the cut plate of the anvil assembly is supported on a distal side of the transverse portion of the guide member and the anvil plate is supported on a proximal side of the transverse portion of the guide member.
A stapling device comprising:

a thrust bar having a distal portion and a proximal portion and movable between retracted and advanced positions, the distal portion of the thrust bar including a stop member;

a clamp slide having a distal portion defining a channel, the distal portion of the thrust bar received within the channel of the distal portion of the clamp slide;

an end effector including:

an end effector frame having a distal transverse portion, a proximal transverse portion, and a longitudinal portion, the longitudinal portion connecting the distal transverse portion in spaced relation to the proximal transverse portion; and

a cartridge assembly releasably received in the channel of the clamp slide, the cartridge assembly including a cartridge body, a staple pusher, and staples, the cartridge body having a distal surface and defining a cavity, and staple receiving pockets that extend from the cavity to the distal surface of the cartridge body, each of the staples received within one of the staple receiving pockets, the staple pusher received within the cavity of the cartridge body and movable from a retracted position to an advanced position; and

a lockout assembly including a lockout member that is movable from an unlocked position to a locked position, wherein in the locked position, the lockout member is positioned to engage the stop member of the thrust bar to prevent movement of the thrust bar from its retracted position to its advanced position.
The stapling device of claim 13, wherein the lockout assembly includes a biasing member that is positioned to urge the lockout member towards the locked position.
The stapling device of claim 14, wherein the lockout member and the thrust bar are formed of metal.
The stapling device of claim 15, wherein the longitudinal portion of the end effector frame defines a frame cavity, and the lockout member is positioned within the frame cavity.
The stapling device of claim 16, wherein the lockout assembly includes a pivot member, and the pivot member pivotably couples the lockout member to the end effector frame.
The stapling device of claim 17, wherein the lockout member includes an abutment member, the abutment member positioned to engage the staple pusher when the staple pusher is in the retracted position to move the lockout member to the unlocked position.
The stapling device of claim 18, wherein the staple pusher includes a camming surface that is positioned to engage the abutment member of the lockout member when the cartridge assembly is loaded onto the clamp slide to move the lockout member from the locked position to the unlocked position.
The stapling device of claim 13, further including an anvil assembly supported on the distal transverse portion of the end effector frame.