Surgical linear stapler

Disclosed is a surgical linear stapler comprising: a staple cartridge which is internally loaded with staples for stapling a surgical site; a cartridge accommodating channel which is formed with a cartridge accommodating groove to accommodate the staple cartridge therein; an anvil which corresponds to the staple cartridge and shapes the staple discharged from the staple cartridge; and a cutter which moves along a lengthwise direction of the staple cartridge by external force and cuts a surgical site arranged in between the staple cartridge and the anvil, in which distances from the cutting section of the surgical site to opposite stapling lines are different from each other, thereby stably and conveniently obtaining tissue for pathological examination, which is not damaged by a staple.

CROSS REFERENCE TO PRIOR APPLICATIONS

This application is a National Stage Application of PCT International Patent Application No. PCT/KR2016/002730 filed on Mar. 17, 2016, under 35 U.S.C. § 371, which claims priority to Korean Patent Application Nos. 10-2015-0055272 filed on Apr. 20, 2015 and 10-2015-0174204 filed on Dec. 8, 2015, which are all hereby incorporated by reference in their entirety.

BACKGROUND OF THE INVENTION

(a) Field of the Invention

The present invention relates to a surgical linear stapler, and more particularly to a surgical linear stapler which can stably and conveniently obtain tissue for pathological examination, which is not damaged by a staple, while stapling and cutting a surgical site.

(b) Description of the Related Art

In general, a surgical stapler is a medical instrument mainly used for cutting and anastomosis of an organ in abdominal and thoracic surgery. Such a surgical stapler is classified into an open stapler used in thoracotomy and laparotomy and an endo stapler used in thoracoscopic surgery and celioscopic surgery

The surgical stapler has advantages of not only shortening operation time since cutting of a surgical site and anastomosis of an organ are performed at a time, but also accurately stapling the surgical site. Besides, the surgical stapler has advantages of a quicker recovery and a smaller scar than those of when a surgical stitching fiber is used for cutting and stapling tissue, and has been thus widespread in the modern surgical operation. In particular, the surgical stapler has been widely used for cutting cancer tissue and stapling a cut site in cancer surgery.

However, biological tissue adjacent to a section obtained for frozen section tissue examination from a surgical site removed after being stapled and cut by a conventional stapler is damaged by a staple, and it is therefore difficult to correctly examine whether a cancer cell is remained in a cutting margin.

SUMMARY OF THE INVENTION

Accordingly, the present invention is conceived to solve the foregoing problems, and an aspect of the present invention is to provide a surgical linear stapler which can stably and conveniently obtain tissue for pathological examination, which is not damaged by a staple, while stapling and cutting a surgical site.

In accordance with an embodiment of the present invention, there is provided a surgical linear stapler comprising: a staple cartridge which is internally loaded with staples for stapling a surgical site; a cartridge accommodating channel which is formed with a cartridge accommodating groove to accommodate the staple cartridge therein; an anvil which corresponds to the staple cartridge and shapes the staple discharged from the staple cartridge; and a cutter which moves along a lengthwise direction of the staple cartridge by external force and cuts a surgical site arranged in between the staple cartridge and the anvil, wherein the staple cartridge comprises a second cutter guide for guiding the cutter to move along a lengthwise direction of the staple cartridge, and a cartridge body formed with a left staple discharge hole and a right staple discharge hole arranged at opposite sides of the second cutter guide, the right staple discharge hole has a first right staple discharge hole the most adjacent to the second cutter guide in a rightward direction, and the left staple discharge hole has a first left staple discharge hole the most adjacent to the second cutter in a leftward direction, and the first right staple discharge hole is more distant from the second cutter guide than the first left staple discharge hole so as to obtain a tissue area for pathological examination, which is not damaged by the staple, from the surgical site.

In accordance with another embodiment of the present invention, there is provided a surgical linear stapler comprising: a staple cartridge which is internally loaded with staples for stapling a surgical site; a cartridge accommodating channel which is formed with a cartridge accommodating groove to accommodate the staple cartridge therein; an anvil which corresponds to the staple cartridge and shapes the staple discharged from the staple cartridge; and a cutter which is arranged in a back of the staple cartridge and cuts a surgical site arranged in between the staple cartridge and the anvil while moving along a lengthwise direction of the staple cartridge by external force, wherein the anvil comprises a first cutter guide for guiding the cutter to move along a lengthwise direction of the anvil, a right anvil groove having a first right anvil groove the most adjacent to the first cutter guide in a rightward direction with respect to a widthwise direction of the anvil, and a left anvil groove having a first left anvil groove the most adjacent to the first cutter guide in a leftward direction with respect to the widthwise direction of the anvil, and a first distance from a center line of the first right anvil groove to a center line of the first cutter guide is greater than a second distance from a center line of the first left anvil groove to the center line of the first cutter guide so as to obtain a tissue area for pathological examination, which is not damaged by the staple, from a surgical site to be removed in the surgical site.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, exemplary embodiments of the present invention for solving the foregoing problems will be described with reference to accompanying drawings. Throughout the following exemplary embodiments, like numerals refer to like elements and repetitive descriptions will be avoided as necessary.

A surgical linear stapler according to a first embodiment of the present invention for obtaining tissue for pathological examination will be described with reference toFIG. 1toFIG. 4.

Referring toFIG. 1toFIG. 4, the surgical linear stapler includes a main body100, a rotary head200, an extension shaft300, a stapling shaft400, a staple cartridge500and a cutter600.

The main body100includes a support grip110to be gripped by a user, a control grip120arranged in front of the support grip110and hinge-coupled to the support grip110, and the stroke bar130.

The stroke bar130is interlocked with the control grip120while penetrating the standing extension shaft300and the rotary head200and also connects with a pull grip131.

The stroke bar130moves forward when the control grip120is controlled, and moves backward when a user pulls the pull grip131backward.

The pull grip131moves in the lengthwise direction of the main body100along guide elongated holes101formed at left and right sides of the main body100in forward and backward longitudinal directions.

The rotary head200is provided in the front of the main body100and makes the extension shaft300and the stapling shaft400be rotated 360° while inserting the stroke bar130therein.

The extension shaft300is placed in between the stapling shaft400and the rotary head200, and a part of the stroke bar130is arranged inside the extension shaft300.

The stapling shaft400includes an anvil410and a cartridge accommodating channel420, and the cartridge accommodating channel420is formed with a cartridge accommodating groove (not shown) to accommodate the staple cartridge500therein.

The staple cartridge500is internally filled with staples for stapling the surgical site, and the anvil410corresponds to the staple cartridge500and shaping the staple discharged from the staple cartridge500.

The cutter600is placed in a back of the staple cartridge500and cuts a surgical site between the staple cartridge500and the anvil410while moving along the lengthwise direction of the staple cartridge500by external force.

Detailed structures of the anvil410and the staple cartridge500are as follows.

The anvil410includes a first cutter guide415for guiding the cutter600to move along the lengthwise direction of the anvil410, a right anvil groove411arranged in a rightward direction of the first cutter guide415with respect to the widthwise direction of the anvil410, and a left anvil groove413arranged in a leftward direction of the first cutter guide415with respect to the widthwise direction of the anvil410.

The right anvil groove411includes a first right anvil groove411awhich is the most adjacent to the first cutter guide415in the rightward direction, and a second right anvil groove411bwhich is formed at a right side of the first right anvil groove411a.

The left anvil groove413includes a first left anvil groove413awhich is the most adjacent to the first cutter guide415in the leftward direction, a second left anvil groove413bwhich is formed at a left side of the first left anvil groove413a, and a third left anvil groove413cwhich is formed at a left side of the second left anvil groove413b.

In result, the right anvil groove411has two rows in the rightward direction of the first cutter guide415, and the left anvil groove413has three rows in the leftward direction of the first cutter guide415. Of course, the present invention is not limited to the foregoing description. Alternatively, the left anvil groove413may have two rows.

To obtain a tissue area for pathological examination, which is not damaged by a staple in a removed surgical site of a surgical site, a first distance D1from the center line of the first right anvil groove411ato the center line of the first cutter guide415is greater than a second distance D2from the center line of the first left anvil groove413ato the center line of the first cutter guide415.

Further, the first distance D1is the same as a third distance from the center line of the second left anvil groove413bto the center line of the first cutter guide415.

Further, a fourth distance from the center line of the second right anvil groove411bto the center line of the first cutter guide415is the same as a fifth distance from the center line of the third left anvil groove413cto the center line of the first cutter guide415. Here, the left anvil groove413and the right anvil groove411have the same depth.

Of course, the present invention is not limited to the foregoing description. As necessary, the first distance and the third distance may be different from each other, and the fourth distance and the fifth distance may be also different from each other.

In addition, an indicator417for indicating a right position of the surgical linear stapler is provided on an outer surface of the anvil410.

Specifically, the indicator417indicates the position of the right anvil groove411so that the tissue area for pathological examination can be included in a surgical site, i.e. a first surgical site C.

The indicator417may be attached to the anvil410in the form of a colored tape distinctive from a view of the exterior, or a projection having a certain shape. Alternatively, the indicator417may be made of a material with a fluorescent substance, or a lighting unit such as a light emitting diode. Further, the present invention is not limited to the foregoing description, and the indicator417may be placed on at least one of an outer surface of the anvil410and an outer surface of the cartridge accommodating channel420.

In result, the indicator417indicates a position of a right staple discharge hole511so that the tissue area for pathological examination can be included in a surgical site of an organ from which is removed, thereby preventing a mistake in surgery.

Further, the staple cartridge500includes a cartridge body510which is formed with a second cutter guide515for guiding the cutter600to move along the lengthwise direction of the staple cartridge500, the right staple discharge hole511corresponding to the right anvil groove411, and a left staple discharge hole513corresponding to the left anvil groove413.

The second cutter guide515is provided as a hole in a center portion of the cartridge body510. Of course, the present invention is not limited to the foregoing description, and the second cutter guide515may be formed at a position deviated from the center of the cartridge body510in the widthwise direction.

The right staple discharge hole511includes a first right staple discharge hole511athe most adjacent to the second cutter guide515in the rightward direction, and a second right staple discharge hole511bformed at a right side of the first right staple discharge hole511a.

The first right staple discharge hole511acorresponds to the first right anvil groove411a, and the second right staple discharge hole511bcorresponds to the second right anvil groove411b. The first right staple discharge hole511ais loaded with a first right staple1a, and the second right staple discharge hole511bis loaded with a second right staple1b.

The left staple discharge hole513includes a first left staple discharge hole513athe most adjacent to the second cutter guide515in the leftward direction, a second left staple discharge hole513bformed at a left side of the first left staple discharge hole513a, and a third left staple discharge hole513cformed at a left side of the second left staple discharge hole513b.

The first left staple discharge hole513acorresponds to the first left anvil groove413a, the second left staple discharge hole513bcorresponds to the second left anvil groove413b, and the third left staple discharge hole513ccorresponds to the third left anvil groove413c.

Here, the first left staple discharge hole513ais loaded with a first left staple3a, the second left staple discharge hole513bis loaded with a second left staple3b, and the third left staple discharge hole513cis loaded with a third left staple3c.

According to an embodiment of the present invention, there are no limits to the number of rows corresponding to the staple discharge holes. However, it is preferable that the number of rows corresponding to the left staple discharge holes513is more than the number of rows corresponding to the right staple discharge holes511.

The reasons are as follows. A surgical site stapled by left staples3discharged from the left staple discharge hole513has to be stitched up densely since it is remained in a human body, whereas there are no needs to densely stitch up a surgical site stapled by right staples1discharged from the right staple discharge hole511since it is removed.

The first right staple discharge hole511ais more distant from the second cutter guide515than the first left staple discharge hole513ain order to obtain a tissue area for pathological examination, which is not damaged by the staple, from the surgical site.

On the top surface the cartridge body510, a protrusion517protrudes between the second cutter guide515and the first right staple discharge hole511a.

The protrusion517presses and holds an area near a cutting section when the cutter600cuts a surgical site in the state that the surgical site is clamped by the anvil410and the staple cartridge500, thereby making the surgical site be stably cut.

The protrusion517minimizes a gap between the anvil410and the staple cartridge500when the surgical site is clamped by the anvil410and the staple cartridge500.

The protrusion517may protrude as a straight line along the lengthwise direction of the cartridge body while having an arc-shaped cross section, or may protrude with embossing patterns at regular intervals.

Of course, the present invention is not limited to the foregoing description, and the protrusion517may be omitted.

As shown in (a) ofFIG. 4, a surgical site A arranged above the staple cartridge500is cut by the cutter600into two surgical sites with respect to a virtual cutting line A0. One of the two surgical sites is a first surgical site C to be removed, and the other one is a second surgical site B to be remained in a human body.

Referring to (b) ofFIG. 4, the first surgical site C has stapling lines of two rows parallel with a cutting section A1, and the second surgical site B has stapling lines of three rows parallel with the cutting section A1.

Here, the distance D1between a first right stapling line1aa, which is near to the cutting section A1, of the stapling lines in the first surgical site C and the cutting section A1is greater than the distance D2between a first left stapling line3aa, which is near to the cutting section A1, of the stapling lines in the second surgical site B and the cutting section A1.

Biological tissue placed in between the cutting section A1and the first right stapling line1aain the first surgical site C is suitable for the tissue for pathological examination since it is not damaged at all.

The distance D1between the cutting section A1and the first right stapling line1aais possible as long as it is to obtain tissue for pathological examination. However, it is preferable that the distance is substantially equal to the distance between the cutting section A1and the second right stapling line among the stapling lines formed in the second surgical site B.

The reasons are because the surgical site A is more stably cut if the surgical site A is held by the staples at corresponding opposite sides of the second cutter guide515, i.e., at the same distances from the cutting section to the opposite stapling lines when the surgical site A is cut by the cutter600.

In result, the distance from the cutting section to the stapling line of an organ site to be removed while cutting one organ into two areas and stapling them is set to be greater than the distance from the cutting section to the stapling line of the surgical site to be remained in a human body, thereby preventing a cutting margin of biological tissue for examination from being damaged in the surgical site to be removed. Therefore, it is possible to stably and conveniently obtain a tissue area for pathological examination, which is not damaged by a staple, in a surgical site of an organ to be removed.

Below, cross-sections of the staple cartridge and the anvil provided in the surgical linear stapler according to a second embodiment of the present invention will be described with reference toFIG. 5.

The elements of the surgical linear stapler in the second embodiment are similar to those of the surgical stapler according to the first embodiment. However, an anvil710provided in the surgical linear stapler according to the second embodiment is different from the anvil provided in the surgical linear stapler according to the first embodiment.

Specifically, the anvil710is formed with a first cutter guide715, a right anvil groove711, a left anvil groove713arranged in the leftward direction, in which the right anvil groove711includes a first right anvil groove711aand a second right anvil groove711b, and the left anvil groove713includes a first left anvil groove713a, a second left anvil groove713band a third left anvil groove713c.

To more firmly hold an area, which is near to the first cutter guide715and stapled by a stapler, of a surgical site to be removed in a surgical site, a depth H1of the first right anvil groove is shallower than a depth H2of the second right anvil groove.

That is, the height of the staple on the first right stapling line after shaping the first right staple1acorresponding to the first right anvil groove711ais lower than the height of the stable on the second right stapling line after shaping the second right staple1bcorresponding to the second right anvil groove711b, thereby more tightly holding the corresponding skin tissue.

As the corresponding skin tissue is more tightly held on the first right stapling line, content of the surgical site, e.g. blood and the like are prevented from leakage.

Likewise, to more firmly hold an area, which is near to the first cutter guide715and stapled, in a remained surgical site of the surgical site, the depth of the first left anvil groove713ais shallower than the depth of the second left anvil groove713b, and the depth of the second left anvil groove713bis shallower than the depth of the third left anvil groove713c.

In the remained surgical site, the height of the staple on the first left stapling line after shaping the first left staple3acorresponding to the first left anvil groove713ais made as low as possible to thereby prevent the content of the remained surgical site from leakage, and the height of the staple on the third left stapling line after shaping the third left staple3ccorresponding to the third left anvil groove713cis made as high as possible to thereby decrease pressure applied to the content of the remained surgical site.

Below, cross-sections of the staple cartridge and the anvil provided in the surgical linear stapler according to a third embodiment of the present invention will be described with reference toFIG. 6.

The elements of the surgical linear stapler in the third embodiment are similar to those of the surgical stapler according to the first embodiment. However, an anvil810provided in the surgical linear stapler according to the third embodiment is different from the anvil provided in the surgical linear stapler according to the first embodiment.

Specifically, the anvil810is formed with a first cutter guide815, a right anvil groove811, and a left anvil groove813arranged in the leftward direction, in which the right anvil groove811includes a first right anvil groove811aand a second right anvil groove811b, and the left anvil groove813includes a first left anvil groove813a, a second left anvil groove813band a third left anvil groove813c.

To make the height of the stapling area of the surgical site to be remained in the surgical site be lower than the height of the stapling area of the surgical site to be removed, a first depth H3of the left anvil groove is shallower than a second depth H4of the right anvil groove.

Here, both the first right anvil groove811aand the second right anvil groove811bhave the same second depth H4, and all the first left anvil groove813a, the second left anvil groove813band the third left anvil groove813chave the same first depth H3.

This is to more safely prevent content from leakage since the remained surgical site is leaved in a human body.

Below, cross-sections of the staple cartridge and the anvil provided in the surgical linear stapler according to a fourth embodiment of the present invention will be described with reference toFIG. 7.

The elements of the surgical linear stapler in the fourth embodiment are similar to those of the surgical stapler according to the first embodiment. However, a staple cartridge provided in the surgical linear stapler according to the fourth embodiment is different from the staple cartridge provided in the surgical linear stapler according to the first embodiment.

The staple cartridge includes a cartridge body1200, which is formed with a second cutter guide1240, a right staple discharge hole1210and a left staple discharge hole1220; a left pressing member1280; a right pressing member1270; and a driving wedge1290.

The right staple discharge hole1210includes a first right staple discharge hole1211and a second right staple discharge hole1213; and the left staple discharge hole1220includes the first left staple discharge hole1221, the second left staple discharge hole1223and a third left staple discharge hole1225.

The right staple discharge hole1210is loaded with a right staple6, and the left staple discharge hole1220is loaded with the left staple7. The right staple6is shaped by the right anvil groove (not shown), and the left staple7is shaped by the left anvil groove (not shown).

The first right staple discharge hole1211is loaded with a first right staple6a, and the second right staple discharge hole1213is loaded with a second right staple6b.

The first left staple discharge hole1221is loaded with a first left staple7a, the second left staple discharge hole1223is loaded with a second left staple7b, and the third left staple discharge hole1225is loaded with a third left staple7c.

Here, the leg of the right staple6to be shaped by the right anvil groove is different in length from the leg of the left staple7to be shaped by the left anvil groove. That is, the leg of the right staple6is longer than the leg of the left staple7.

If distances between the staple discharge holes to the anvil grooves are uniform, the height of the staple after shaping becomes higher as the leg of the staple increases.

In result, the leg of the right staple to be shaped by the right anvil groove is longer than the leg of the left staple to be shaped by the left anvil groove, so that tissue of a surgical site to be cut and removed can be more loosely held, thereby minimizing the damage of the tissue area for pathological examination.

By the way, the right pressing member1270presses the right staple6toward the outside of the right staple discharge hole1210in order to discharge the right staple6, and the left pressing member1280presses the left staple7toward the outside of the left staple discharge hole1220in order to discharge the left staple7.

Since the leg of the right staple6is longer than the leg of the left staple7, the length of the right pressing member1270is shorter than the length of the left pressing member1280.

Of course, the present invention is not limited to the foregoing description. Alternatively, the right pressing member1270and the left pressing member1280may be different in length from each other regardless of the leg length of the staple.

The driving wedge1290pushes up both the right pressing member1270and the left pressing member1280toward the right staple discharge hole1210and the left staple discharge hole1220, respectively. Thus, the right staple6and the left staple7are discharged from the right staple discharge hole1210and the left staple discharge hole1220, respectively.

Below, a surgical linear stapler according to a fifth embodiment of the present invent ion will be described with reference toFIG. 8andFIG. 9.

The surgical linear stapler according to the fifth embodiment includes an upper body10, a lower body20, a lower grip30, a staple cartridge50and a cutter60.

Specifically, the upper body10includes an anvil11, a upper grip12arranged in a back of the anvil11, and a coupling projection14arranged in a region where the upper grip12and the anvil11are connected.

In addition, an indicator11afor indicating a right position of the surgical linear stapler is provided on an outer surface of the anvil11.

The lower body20includes a cartridge accommodating channel21, a guide slot22arranged in a back of the cartridge accommodating channel21, and a coupling portion28arranged in a region where the cartridge accommodating channel21and the guide slot22are connected.

Further, the cartridge accommodating channel21is formed with a cartridge accommodating groove23in which the staple cartridge50is accommodated.

The guide slot22is provided with a sliding member24that moves along the lengthwise direction of the guide slot22. The sliding member24includes a driving wedge26for discharging the staple loaded in the staple cartridge50, and a push bar27for moving the cutter60.

The coupling portion28is provided with a stopper40for restricting the movement of the sliding member24, and the stopper40is formed with a plurality of through holes through which the driving wedge26and the push bar27pass.

Further, the coupling portion28receives the coupling projection14so that the upper body10and the lower body20can be coupled with each other.

The lower grip30is placed beneath the lower body20and hinge-coupled to the coupling portion28.

The staple cartridge50is internally loaded with staples for stapling the surgical site, and the cutter60is placed in the back of the staple cartridge50.

The cutter60cuts a surgical site between the staple cartridge50and the anvil11while moving along the lengthwise direction of the staple cartridge50by external force.

The staple cartridge50includes a second cutter guide57for guiding the cutter60to move along the lengthwise direction of the staple cartridge50, and a cartridge body51formed with left staple discharge holes55and right staple discharge holes53arranged at opposite sides of the second cutter guide57.

Each of the left staple discharge holes55and the right staple discharge holes53has two rows at each side of the second cutter guide57on the contrary to those of the foregoing embodiments.

Further, the rows of the left staple discharge holes55are spaced differently from the rows of the right staple discharge holes53. Specifically, the rows of the right staple discharge holes53are formed more narrowly than the rows of the left staple discharge holes55.

Further, the first row of the right staple discharge hole53is more distant from the second cutter guide57than the first row of the left staple discharge hole55in order to obtain tissue area for pathological examination, which is not damaged by the staples, of the surgical site.

Specifically, as shown in (a) ofFIG. 9, the surgical site A arranged above the staple cartridge50is cut by the cutter60into two surgical sites with respect to a virtual cutting line A0. One of the two surgical sites is a first surgical site C, and the other one is a second surgical site B to be remained in a human body.

Referring to (b) ofFIG. 9, the first surgical site C has stapling lines of two rows parallel with a cutting section A1, and the second surgical site B has stapling lines of two rows parallel with the cutting section A1.

Here, the distance D1between a first right stapling line1aa, which is near to the cutting section A1, of the stapling lines in the first surgical site C and the cutting section A1is greater than the distance D2between a first left stapling line3aa, which is near to the cutting section A1, of the stapling lines in the second surgical site B and the cutting section A1.

Biological tissue placed in between the cutting section A1and the first right stapling line1aain the first surgical site C is suitable for the tissue for pathological examination since it is not damaged at all.

Here, if both the second row of the right staple discharge hole53and the second row of and the left staple discharge hole55are at the same distance from the second cutter guide57, it is possible to obtain a larger tissue area for pathological examination as a space between the rows of the right staple discharge holes53gets narrower.

Of course, the present invention is not limited to the foregoing description. Alternatively, the structures of the staple cartridge and the anvil may be substantially the same as those of the surgical linear stapler according to the first to fourth embodiments.

The surgical linear stapler according to the present invention has effects as follows.

First, the first right staple discharge hole and the first left staple discharge hole arranged at opposite sides with respect to the second cutter guide are different in distance from the second cutter guide from each other, so that the distance from the cutting section to the stapling line of an organ to be removed is greater than the distance from the cutting section to the stapling line of the surgical site to be remained in a human body while cutting one organ into two areas and stapling them, thereby having an advantage of preventing the cutting margin of the biological tissue for the examination from being damaged within the tissue of the organ to be removed.

Second, the first right anvil groove and the first left anvil groove arranged at opposite sides with respect to the first cutter guide are different in distance from the first cutter guide from each other, so that the distance from the cutting section to the stapling line of an organ to be removed is greater than the distance from the cutting section to the stapling line of the surgical site to be remained in a human body while cutting one organ into two areas and stapling them, thereby having an advantage of preventing the cutting margin of the biological tissue for the examination from being damaged within the tissue of the organ to be removed. In result, it is possible to stably and conveniently obtain a tissue area for pathological examination, which is not damaged by a staple, in tissue of an organ to be removed.

Third, the protrusion is arranged on the top of the cartridge body between the first right staple discharge hole and the second cutter guide, so that the protrusion can press and hold an area near the cutting section when the cutter cuts a surgical site in the state that the surgical site is clamped by the anvil and the staple cartridge, thereby making the surgical site be stably cut.

Fourth, the depth of the first right anvil groove is shallower than the depth of the second right anvil groove in order to more firmly hold an area, which is near to the first cutter guide and stitched up by a staple, of a surgical site to be removed in the surgical site, so that corresponding skin tissue is more tightly held on the first right stapling line thereby having an advantage of preventing content of the surgical site, e.g. blood and the like from leakage.

Fifth, the leg of the right staple shaped by the right anvil groove is longer than the leg of the left staple shaped by the left anvil groove, so that tissue of a surgical site to be cut and removed can be more loosely held, thereby minimizing the damage of the tissue area for pathological examination.

Sixth, the indicator for indicating the position of the right staple discharge hole is placed on at least one of the outer surface of the anvil and the outer surface of the cartridge accommodating channel, and thus a tissue area for pathological examination is included in a surgical site of an organ which is removed, thereby preventing a mistake in surgery.

As described above, a surgical stapler according to the present invention can stably and conveniently obtain a tissue area for pathological examination, which is not damaged by a staple, within a tissue of an organ to be removed, and be therefore widely used as a surgical stapler for cutting and anastomosis of an organ in abdominal and thoracic surgery of cutting cancer tissue and stapling the cutting site.