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Skin stapler

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US3643851A
US3643851A US3643851DA US3643851A US 3643851 A US3643851 A US 3643851A US 3643851D A US3643851D A US 3643851DA US 3643851 A US3643851 A US 3643851A
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Prior art keywords
staple
cartridge
means
staples
pusher
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David T Green
Graham W Bryan
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United States Surgical Corp
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United States Surgical Corp
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/0682Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil
    • A61B17/0684Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil having a forming anvil staying above the tissue during stapling
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00535Surgical instruments, devices or methods, e.g. tourniquets pneumatically or hydraulically operated
    • A61B2017/00544Surgical instruments, devices or methods, e.g. tourniquets pneumatically or hydraulically operated pneumatically

Abstract

A surgical instrument for applying sterilized staples from a disposable staple-carrying cartridge to the disunited skin of a patient in order to effect a joining of the skin. The instrument consists of an anvil adapted to lie flush with the skin, a disposable cartridge housing a plurality of staples which are to be folded around the anvil, and a pusher for bending the staples around the anvil. The pusher is U-shaped with chamfers on the arms thereof to effect the bending with a minimum of force. A gas-powered unit serves to eject and form the staples in a neat and uniform manner. A novel disposable gas cartridge is also disclosed.

Description

United States Patent Green et al.

[ 1 Feb. 22, 1972 [54] SKIN STAPLER [72] Inventors: David T. Green, Norwalk; Graham W.

Bryan, Ridgefield, both of Conn.

[73] Assignee: United States Surgical Corporation, Baltimore, Md.

[22] Filed: Aug. 25, 1969 [21] Appl.No.: 852,822

....227I19, 227/120, 227/130 ..B25e 5/10, B250 5/16 ..227/19, 83, 88,107,108,112, 227/120, 130, 140

[52] US. Cl [51] Int. Cl. [58] field of Search [56] References Cited UNITED STATES PATENTS 1,125,411 1/1915 Szemerey ..227/120 UX 2,964,752 12/1960 Kopf.... ...227/130UX 3,049,712 8/1962 Khan ..227/130X Primary Examiner-Granville Y. Custer, Jr. Attorney-Fleit, Gipple & Jacobson [57] ABSTRACT A surgical instrument for applying sterilized staples from a disposable staple-carrying cartridge to the disunited skin of a patient in order to effect a joining of the skin. The instrument consists of an anvil adapted to lie flush with the skin, a disposable cartridge housing a plurality of staples which are to be folded around the anvil, and a pusher for bending the staples around the anvil. The pusher is U-shaped with chamfers on the arms thereof to effect the bending with a minimum of force. A gas-powered unit serves to eject and form the staples in a neat and uniform manner. A novel disposable gas cartridge is also disclosed.

41 Claims, 39 Drawing Figures POWER UNIT 1 IIIIIIIII PATENTEDFEB 2 2 I972 SHEET 2 OF 9 INVENi 'ORS DAVID T. GREEN GRAHAM W. BRYAN PAIENTEDFEB 22 I972 SHEET 3 OF 9 INVENTORS L DAVID T. GREEN GRAHAM W. BRYAN A w I I m \%w BYN' M y /afio mlms PAIENIEBFEBZZ 1972 3. 643 851 sun-:1 u 0F 9 X 6 FIG. 9

INVENTORS DAVID T. GREEN GRAHAM W. BRYAN I MRNEYS FIG. 26

PATENTEDFEH22 I972 3.643.851

SHEET 6 0F 9 INVENTORS DAVID T. GREEN GRAHAM W. BRYAN PAIENTEUFEB 22 m2 SHEET 7 [IF 9 INVENTORS DAVID T. GREEN GRAHAM W. BRYAN PATENTEDFEB 22 I972 SHEET 8 OF 9 MM QFK INVENTORS DAVID T. GREEN GRAHAM W. BRYAN 0 wZ/ MUS PATENTEDFEB 22 m2 SHEET 9 OF 9 INVENTORS DAVID T. GREEN GRAHAM W. BRYAN BY M W, ATTORNEYS SKIN STAPLER BACKGROUND OF THE INVENTION The use of sterilized staples for medical applications has been steadily and rapidly increasing in popularity. However, the use has largely been restricted to applications wherein the tissue to be stapled can be positioned between the stapleejecting unit and the anvil of the instrument. Where the tissue joint is to be made on the external skin of the patient, medical instrumentation is noticeably weak. Thus, there exists a void in modern surgical instruments making effective use of the staple in uniting external tissue.

There is another void in the field of modern surgical stapling instrumentation. Despite the wide use of sterilized staples for performing suturelike maneuvers, it has customarily been difficult for the surgeon, or assistant, to perform successive stapling operations in a way so that the staples are uniformly injected and shaped. The main reason for the resulting disuniformity of injection and shaping operations is that the surgeon is unable to exert a constant manipulative force on the instrument which he uses. Another reason is that after numerous stapling operations, the handpf the surgeon tends to tire, thus adding to the disuniformity of staple injection and shaping.

It is toward the elimination of the above-noted drawbacks of presently existing surgical stapling instruments, that the present invention is directed.

SUMMARY OF THE INVENTION The present invention relates to a surgical instrument for stapling together disunited segments of the external skin of a patient. I I

Since this instrument functions externally to the body, the anvil serving to form the staple must be and is, at all times, external to the skin being stapled. More particularly, the anvil is adapted to rest on the external skin of the patient and to bend the staples so that they tightly grip and join the severed skin.

The staple is acted upon by a U-shaped pusher element having a chamfer on each leg thereof so that the staples are acted upon by forces remote from the points about which they are bent. In this manner, less force is required to bend the staples. The central region of each staple is made to contact the anvil. The pusher element then bends the staple around the anvil, the chamfer surfaces reducing the force required for such bending, and the U-shape of the pusher allowing the pusher to partially encircle the anvil during the bending operation for forming the staple. The anvil releases the staple by means of a spring and the stapling maneuver is complete.

In the instrument of the present invention, a plurality of staples are housed in a disposable cartridge. These staples are housed in such a manner that only a'small area of the instrument need contact the patient. For this reason, the stapling instrument of the present invention may also be used for the stapling ofinternal fascia.

The instrument of the present invention is powered by a disposable gas cartridge. Thus, there is complete uniformity of staples from one stapling operation to the next. Also, there is no fatigue of the surgeon or his assistant since the gas-powered unit is activated by a slight movement of a lever or trigger. In operation, the gas-powered staple-ejecting unit is activated by the operator and performs its stapling operation, returning to its initial state for further activation in a minimum of time and with a maximum of efficiency. The power unit is simple in design, contains but few moving parts and is a repeating unit having an extremely long life cycle.

The cartridge contains 25 staples. Each staple lies in the threads of a pair of adjacent screws and each is propelled one step when the screws are simultaneously turned one revolution. The power unit is fired and a rodlike element initiates the operation of a gearbox and simultaneously drives the pusher forward. The gearbox ensures that a staple is put in a readiness position before the pusher reaches the contact area. The pusher unit then automatically returns to its rearward position and the instrument is put in readiness for another stapling maneuver.

The present invention thus provides a surgical stapling instrument which fills the gaps noted above with regard to the instrumentation known to the prior art. Staples may be used to unite the external skin of a patient and may be uniformly shaped without causing fatigue in the surgeon.

As noted above, the instrument of the present invention is powered by means of a sterilized disposable gas cartridge. It is customary when gas-powering units are employed, to provide the recipient device with a pin for puncturing the seal in the gas cartridge. It has been found, however, that the pin wears I rapidly and thus detracts from the useful life of the gaspowered device.

The present invention contemplates that a gas cartridge be fitted with its own puncturing mechanism, thereby adding to the life of the basic instrument. In this manner, a sterilized gas cartridge with its puncturing mechanism and a sterilized and filled staple cartridge may be packaged together so that the reloading operation is greatly facilitated.

Accordingly, it is one object of the present invention to provide a surgical stapling instrument for stapling disunited portions of the external skin of a patient.

'It is another object of the invention to staple the skin of the patient in such a manner that a minimum of force is required to form the staple during the maneuver.

It is yet a further object of the invention to provide a stapling instrument having a disposable staple-carrying cartridge.

It is a further object of the invention to provide a medical instrument for stapling the skin of a patient, which instrument is powered by a gas under pressure.

It is still another object of the present invention to provide a unique and disposable pressurized gas-powering assembly.

It is yet a further object of the invention to provide a gaspowered driving mechanism which is simple in design, economical in cost and is yet efficient and long lived.

These and other objects of the invention, as well as many of the attendant advantages thereof, will become more readily apparent when reference is made to the following description taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view, partially in section, showing the skin stapler of the present invention;

FIG. 2 is an enlarged side view, partially in section, of the mechanismshown in FIG. I after the cartridge is mounted and ready for use; 7

FIG. 3 is a top view of the cartridge of the present invention;

FIG. 4 is a bottom view of the cartridge shown in FIG. 3;

FIG. 5 is an enlarged view of the rear portion of the cartridge shown in FIG. 3 with a portion of the cover removed;

FIG. 6 is a cross section taken along lines 6-6 of FIG. 5;

FIG. 7 is a cross section taken along lines 7-7 of FIG. 6;

FIG. 8 is an enlarged view of the front portion of the cartridge shown in FIG. 3 with the cover partially removed;

FIG. 9 is a cross section taken along lines 9-9. of FIG. 8; FIG. 10 is a cross section taken along lines 10-10 of FIG.

FIG. 11 is a front view ofthe cartridge shown in FIG. 3;

FIG. 12 is a top view of the pusher element forming a part of the present invention;

FIG. 13 is a side view of the pusher element shown in FIG. 12;

FIGS. 14 through 17 are sequential views showing the formation of a staple during a stapling operation;

FIGS. 18 through 22 show the sequential formation of a staple in the skin of a patient;

FIG. 23 is a cross section through the gas-powered driving mechanism of the present invention;

FIGS. 24 through 28 are drawings showing the sequential steps involved in ejecting and forming a staple with the gaspowered mechanism shown in FIG. 23;

FIG. 29 is a front view of the main body portion of the skin stapler shown in FIG. 1;

FIG. 30 is a top plan view ofthe gearbox housing;

FIG. 31 is a cross section through lines 31-31 of FIG. 30;

FIG. 32 is a side elevation of the gear arrangement shown in FIG. 31;

FIG. 33 is a cross section of the gearbox through lines 33 33 of FIG. 30 in its retracted, or readiness, position;

FIG. 34 is a view similar to FIG. 33 but with the gearbox in its stapling position;

FIG. 35 is a view similar to FIGS. 33 and 34, showing the moving parts of the gearbox when returning from the position shown in FIG. 34 to the position shown in FIG. 33;

FIG. 36 is a side view of a second embodiment of the main body portion ofa skin stapler constructed in accordance with the present invention;

FIG. 37 is a sectional view through lines 37-37 of FIG. 36 with the gas-cartridge assembly removed;

FIG. 38 is a sectional view through lines 3838 of FIG. 36; and

FIG. 39 is an exploded perspective view of the gas cartridge and piercing mechanism shown in FIGS. 36 through 38.

DETAILED DESCRIPTION OF THE DRAWINGS In FIG. I, the skin stapler of the present invention is shown generally at and comprises a disposable staple cartridge indicated generally at 12 and a main body portion indicated generally at 14. The main body portion 14 has a region 16 serving as the handle which the surgeon holds during use. The handle 16 further serves to house the gas-powered firing mechanism 17, including a source of CO gas. The forwardmost region of the main body portion 14 defines a cartridgemounting assembly 18 for positioning and holding the cartridge 12. Intermediate the handle 16 and the cartridge mounting assembly 18 is a gearbox region 19. Region 19 houses the gearbox which synchronizes the movements of the elements forming a part of the inventive skin stapler.

In FIG. 1, the cartridge 12 is in the process of being seated in the cartridge-mounting assembly 18. It can be seen that the assembly 18 has defined therein a cavity 20, this cavity being of such dimensions as to allow the angular insertion of the cartridge 12. A hand-operated semicylindrical cam 22 is rotatably mounted in the assembly 18.

When the cartridge 12 is being inserted or removed from the main body portion 14, the cam 22 is in the position shown in FIG. 1. To lock the cartridge 12 in the main body portion 14, cam 22 is rotated 180 until it takes the position shown in FIG. 2 and securely contacts the bottom of cartridge 12 with its camming surface 23. The cartridge 12 is held in horizontal alignment with the main body portion 14 by means ofa pair of upwardly extending flanges 24 on the cover plate of the cartridge l2. Flanges 24 engage a pair of recesses 26 defined in the cartridge-mounting assembly 18.

As is best shown in FIGS. 6 and 11, the two flanges 24 extend upwardly from the rear end of the cartridge cover and are spaced apart. This spacing is provided to enable a driving member 28 (FIG. 2) to reciprocate between the two flanges 24.

As shown in FIG. 1, the driving member 28 has an elongated central region 29. A pusher-engaging extension 30 is positioned at the extreme front end and an inclined surface 32 is positioned at the mid section of the driving member 28. The inclined surface 32 is adapted to engage a slidable plunger 34 which is spring-biased upwardly by a spring 35.

In FIG. 1, the driving member 28 is shown in its rearwardmost position to allow for the insertion or the removal of the cartridge 12. In this position, the plunger 34 is maintained in its uppermost position by the force of the biasing spring 35. When the member 28 is driven forward during a stapling operation, the plunger 34 is acted upon by the surface 32 and is forced downward against the biasing force of spring 35. The functions of these elements are described in more detail belowf The configuration of the cartridge 12, and its operation, will now be explained with reference to FIGS. 3 through I3. The cartridge 12 is defined by a body 36 adapted to be covered by a cover plate 38. The body 36 has provided thereon a pair of alignment extensions 40 which serve to engage the cover plate 38 at respective recesses -42 provided therein. This is best shown in FIGS. 4 and .5. The body 36 of the cartridge 12 is fitted with a pair of cylindrical depressions 44, shown best in FIG. 7. Depressions 44 extend substantially the entire length of the body 36 and serve to position a pair of rotatably mounted screws 46.

As best seen in FIGS. 7 and 8, the pair of depressions 44 are defined in the body 36 of the cartridge 12. These depressions 44 serve to define ledges 49 and lateral walls 51, which ledges and walls function to guide a plurality ofstaples 50.

From FIGS. 6 and 7, it can be seen that the ledges 49 and lateral walls 5] guide the staples 50, over a substantial length of the cartridge, at a level beneath the external circumference of each screw 46. This is made possible since the screws 46 are provided with threads 52 for guiding and propelling the staples 50 along the ledges 49 and between the walls 51.

A pusher plate 54 covers the staples 50 and slides within an indentation 56 provided in the cover plate 38, the pusher plate 54 being guided by the top of the screws 46 and the bottom of the cover plate 38. The pusher plate 54 serves to hold each staple 50 against the ledges 49 except during a driving operation. Then, the forwardmost staple is propelled forward and away from the cover ofthe pusher element 54.

Each screw 46 is provided, at its rearwardmost end, with an extension 58. Each extension 58 is unthreaded, is rotatably held in a cylindrical recess 59 in the body 36, and is fitted at its extremity with a flat extension 60. See FIGS. 5 and 6.

In FIGS. 12 and 13, the configuration of the pusher element 54 is illustrated. The pusher element 54 is in the form of a flat plate having a pair of upwardly extending guide projections 66 centered thereon. Projections 66 are adapted to slide in recesses 67 on the top of the cover plate 38. The rearwardmost region of the pusher element 54 is out at 68 and is adapted to be engaged by the pusher-engaging extension 30 on the driving member 28, described with reference to FIG. 1. The extension 30 reaches the hole 68 through a slot 69 provided in the cover plate 38. The forwardmost region of the pusher element 54 is U-shaped, defining a pair of tines 70. As best seen in FIGS. 8, 9, 12 and 13, the tines 70 are V-shaped in order to best guide the staples 50 during the staple-discharging operation. For reasons which are explained below, each tine 70 is provided with a chamfer 72.

At the forwardmost region of the cover plate 38, and as illustrated in FIGS. 1, 3, 9 and 11, projects an anvil 62. The anvil 62 is an extension of the top of the-cover plate 38 and curls into the plane of the pusher element 54. The anvil 62 is fitted with staple-ejecting springs 64 for forcing the staples out of the region of the anvil 62 after the completion of each stapling operation. It should be evident that the pusher element 54 moves the springs 64 out of the staple-forming plane during the stapling operation and releases the springs when it begins to retract. Once the pusher element 54 is retracted from the anvil area, the springs 64 urge the staple 50, just formed, out of the plane ofthe pusher.

As best shown in FIG. 3, the tines 70 of the pusher element 54 are spaced apart a distance sufficient to comfortably accommodate the anvil 62. More particularly, with reference to FIG. 17, the distance between the tines 70 is equal to the width of the anvil 62, plus twice the diameter of a staple 50, plus a small clearance to avoid sluggish operation.

In loading the cartridge 12, the following procedure may be used. The screws 46 may be fitted into their respective cylindrical depressions 44. Then the staples 50 may be iiiserted between the lateral walls 59 of the body 36. The screws should be in the position shown in FIG. 5 with the flat extensions 60 aligned and vertical. The pusher element 54 is then fit over the staples 50 and the cover plate 38 is put in position. Once, this procedure has been followed, the cartridge 12 is ready to be loaded into the instrument.

The screws 46 are threaded so that when they, by means of the extensions 60, are rotated through 360, each staple moves one staple unit. A staple unit" may be defined as that distance required to move the second staple from its readiness position into a position ready to be fired. Thus, in FIGS. 8 and 9, one staple unit is shown ata.

With reference now to FIGS. 8, 9 and 10, the positioning of the forwardmost staple 50 will be described. This staple is, initially, one staple unit from a position ready for firing. The pusher element 54 is then in its rearwardmost position, which position holds all staples in the threads 52 ofthe screws 46.

As is seen in FIG. 9, each ledge 49 is terminated at its forwardmost region in an inclined surface 74. Surface 74 serves to guide the point of the forwardmost staple 50 upwardly and into the plane of the pusher element 54 during the forward thrust of the pusher. Simultaneous with the action of the surface 74, the forwardmost portion of each screw 46 serves to raise the crosspiece of the first staple 50 into the plane of the pusher element 54. This is best shown in FIG. 10 which illustrates the forwardmost portion of the screw 46. The direction of rotation of screw 46 is indicated by arrow 75. It is seen that the thread depth decreases from a maximum at 76 to a minimum at 78. The thread depth at 76 is equal to the thread depth uniform throughout the thread save for the most forward region. The depth of the thread at 78 is zero. Thus, when the crosspiece of a staple rides along the screw at 78, it is in the plane of the pusher element 54.

The staple-ejecting and guiding operation will now be explained. When the pusher element 54 is activated, it is thrust forward by the member 28. Before, however, the pusher element 54 reaches the contact area, the inclined surface 32 on member 28 causes plunger 34 to be depressed, thus advancing a staple into stapling position. Once the staple is properly positioned, pusher element 54 reaches the contact area and forces the first staple (See FIGS. 8 and 9.) out of the cartridge 12 and against the anvil 62. When the pusher element 54 reaches its forwardmost position, its direction of travel is reversed (it being controlled by the driving member 28 shown in FIGS. 1 and 2). At a time during the rearward journey of the pusher element 54, the inclined surface 32 on the driving member 28 releases the plunger 34, allowing the plunger and the gearing mechanism to be put in readiness for the next stapling operation. The gear mechanism causes the two screws 46 to turn slightly better than one revolution during the forward movement of the pusher element 54. This will be explained below.

The interaction of the pusher element 54, the staples 50, the ledge 49 with its inclined surface 74 and the screws 46 with their diminishing thread arrangements will now be explained. A gearbox, described below, turns each screw 46 through slightly more than one revolution during the forward stroke of the pusher element 54, thereby advancing each staple but the first, slightly more than one staple unit. The forwardmost staple moves only one staple unit and into a readiness position because of the lack of threads at the forward ends of the screws 46. When the screws 46 turn, thereby advancing each staple, the forwardmost staple 50 is simultaneously acted upon by the ledge 74 and the diminishing thread of the screws 46. In this manner, the first staple is "raised from its position below the pusher element 54 into the plane of the pusher, while remaining parallel, at all times, to the plane of the pusher. This is done while the pusher moves forward but before it reaches the contact area. Once the first staple is ready to be expelled from the instrument, the pusher element 54 makes contact with the staple.

The disposable cartridge of the present invention may house any number of staples, but is shown to house, in this example, 25. It is therefore possible that more than one cartridge is required during a single operation. It becomes important, then, to keep the surgeon advised as to the number of staples remaining in his disposable cartridge. The present invention provides for the indication of the number of remaining staples.

Reference should now be directed to FIGS. 4 through 7. Beneath each cylindrical depression 44 in the body 36 is a small rectangular depression 80. Depressions 80 extend substantially the entire length of the body 36 and communicate with depressions 44. Through the bottom of body 36 extend 25 tapered bores 82. As is best seen in FIG. 7, the recesses 44 communicate with the bores 82 by means of a plurality of cylindrical bores 84 of a smaller diameter than the smallest diameter of the tapered bores 82.

A pair of pads 86 and 88 of a rectangular shape are housed within the slide in the recesses 80. Each pad 86 and 88 is provided with a cylindrical extension 90. Each extension 90 serves to ride within the thread 52 ofa screw 46.

As shown in FIG. 4, the tapered bores 82 are staggered throughout the length of the cartridge 12. As is also seen in FIG. 4, the pads 86 and 88 ride in their respective recesses in alignment. Because of the alignment between pads 86 and 88 and the staggered arrangement of bores 82, only a single pad at a time is visible through a bore.

In operation, the pads 86 and 88 are positioned in alignment with the rearwardmost bore 82, as shown in FIG. 4. This bore is numbered 25" and indicates that 25 staples remain in the cartridge. Initially, pad 88 is visible through this bore. After one staple has been ejected from the cartridge, each screw 46 has been rotated 360. Since the projections on the pads 86 and 88, respectively, engage the threads 52 of the screws 46, the pads move one staple unit. The bores 82 are separated by one staple unit. Consequently, pad 86 is visible through bore 82 which is'labeled 24." This staggering relationship of visible pads continues until pad 88 is visible through the bore 82 referenced I," this indicating that one staple remains. When the last staple is ejected, the pads 86 and 88 are both masked by the body 36. In this manner, the surgeon is constantly appraised ofthe number ofstaples remaining in his instrument.

With reference now to FIGS. 14 through 17, the interaction between the pusher element 54, a staple 50 and the anvil 62 is explained. In each of these four figures, the pusher element 54 is shown to be moving toward the left of the page, in the direction of the arrow.

In FIG. 14, the relative positions of the pusher element 54 and a staple 50 are shown at impact. In FIG. 14, the pusher element is shown in the contact area. It is evident, then, that the screws have already been turned to advance the staples 50.

The pusher element 54 moves forward from the position shown in FIG. 14 until the staple 50 contacts the anvil 62, the staple 50 being guided by the V-shaped surfaceof the pusher tine 70. The pusher 54 is driven to the left and, because of the chamfers 72 in the tines 70, staple 50 is easily bent around the anvil 62. After the pusher element 54 advances slightly, the staple takes the shape shown in FIG. 16, still being guided by the V-shape of the pusher tine. The chamfer surface allows a bending force to be exerted on the staple 50 at points remote from the anvil 62. In this manner, the required initial bending force is reduced.

Once the staple is in the position shown in FIG. 16, the bending force is moved from the outermost region of the chamfer to the innermost region. However, because of the buildup of inertial forces, bending is still easily accomplished. The pusher element advances until it reaches the position shown in FIG. 17. In this position, the staple 50 is substantially rectangular and has its points in engagement.

With reference now to FIGS. 18 through 22, the formation of the staple with respect to the skin will be explained. The external skin of the patient is shown at 92 and is split at an incision 94. The function of the skin stapler of the present invention is to securely fasten the two segments of skin 92 and to maintain the fastened position neatly and securely to facilitate the healing process.

As seen in FIG. 18, the front end of the skin stapler is pressed against the skin of the patient covering the incision 94. If properly positioned, the anvil 62 is centered with respect to the incision 94. The member 28 is activated and the pusher element 54 begins its forward journey. Simultaneously, the staples 50 are guided forward. When the pusher element 54 reaches the contact area, the forward staple is ready to be ejected. The pusher contacts the first staple, as shown in FIG.

18. Pusher element 54 then expels the staple 50 from the cartridge and drives same until it contacts the anvil 62, as shown in FIG. 19. In this Figure, it is seen that the staple pierces the skin of the patient.

In FIG. 20, the staple is shown when beginning to crimp the skin 92. In this position, the staple is formed as described above with respect to FIG. 16.

The staple is then completely curled around the anvil 62 so that it takes the shape illustrated in FIG. 17. The corresponding position of the staple with respect to the skin is shown in FIG. 21.

During the forward thrust of the pusher element 54, the tines 70 move the springs 64 out of the staple plane. After the stapling operation is completed and the pusher begins to return to its rest position, springs 64, associated with the anvil 62, serve to eject the staple 50 from the anvil. The skin 92 is then free, under the force of subsurface tissue, to expand toward the crossbar of the staple. This is shown in FIG. 22.

Since only the forwardmost portion of the skin stapler 10, which portion is relatively small, contacts the patient during a stapling operation, the stapler of the present invention is quite versatile. It may be used to staple external skin or an internal organ. This has never before been possible in the prior art.

The pusher element may be driven by any ofa large number of configurations. It may be driven manually or it may be driven by springs. The present invention, however, contemplates that the pusher element be driven by a gas under pressure. More particularly, the present invention contemplates that the pusher element be driven by a charge of carbon dioxide housed within small pressurized and disposable tanks.

With reference, now, to FIGS. 23 through 28, the gaspowering unit of the present invention is described.

With reference first to FIG. 23, the configuration of the drive mechanism is as follows. The drive mechanism is shown generally at 100 and comprises a gas inlet port 102, a spool 104, a pair of diaphragm seals 106 and 108, respectively, a transfer port 110 extending from one side to the other of the spool 104, a piston 112 sealed against the wall 114 of a piston chamber 134 by means of a rolling diaphragm 115 and a spring 117 serving to resiliently bias the piston I12 upwardly. Secured to the piston 112 is an output shaft 116 provided with a notch 118. The uppermost part of the output shaft 116 is designated 120 and serves, under the action of spring 117, to exert an upward force on the spool 104. A seal 122 is defined at the opening of the gas inlet port 102 and prevents the escape of gas from the inlet port 102 when contacted by the spool 104. A vent 124 and an exhaust 126 are provided and communicate with a vent chamber 128 and an exhaust chamber I30, respectively. An inlet chamber 132 communicates with the inlet port 102.

With reference, now, to FIGS. 24 through 28, the operation of the power unit 100 will be explained. As noted above, when the spool 104 is acted upon by the spring 117, it impinges upon the seal 122, thus preventing the entrance of the pres surized gas into the inlet chamber 132. The pressure acting on the top of spool 104 is less than the force exerted by the spring I17 since the pressure in he inlet port acts on a small area when spool I04 abuts seal 122.

In FIG. 24, a trigger mechanism 136 is shown pivoting around a pivot 138. The forwardmost end of the trigger I36 engages the notch 118 in the output shaft 116. Thus, when the trigger 136 is activated, the force exerted by the spring 117 is overcome and the spool 104 is driven from the seal 122, downwardly, off the inlet port 102, by the gas under pressure. When the spool 104 reaches the bottom of the exhaust chamber 130, the exhaust port 126 is sealed with respect to the pressurized gas in the inlet port 102. The pressurized gas then flows through the inlet port 102, into the inlet chamber 132, then through the transfer port 110 and into the piston chamber 134. The pressure exerted by the gas drives the piston 112 downwardly and into the position shown in FIG. 25.

Initially, the pressure in the piston chamber 134 is lower than the pressure in the inlet chamber I32 due to the restriction in the transfer port 110. The pressure in the piston chamber 134, however, rapidly builds up until it overcomes the pressure in the inlet chamber 132. The pressure in the piston chamber overcomes the pressure in the inletchamber because the piston chamber acts on a larger area (the bottom of spool 104) than does the inlet chamber pressure (which acts on the top of diaphragm 106).

As a consequence of the area differential noted above, the pressure in the piston chamber 134 drives the spool 104 upwardly, thus sealing the inlet port when the spool again contacts seal 122. This is shown in FIG. 26. The pressure in the piston chamber 134 at this point is directly proportional to the ratio of the areas between the upper and lower diaphragm seals 106 and 108. The pressures inside the system then tend to equalize.

The gas in the piston chamber 134 is now free to escape through the restricted exhaust port 126 and into the atmosphere. At the same time, the spring 117 forces the piston 112 upwardly, thus maintaining a back pressure on the lower diaphragm I08 and thus holding the spool 104 against the seal 122. This continues until the upper region of the output shaft 116 contacts the spool 104. Once this contact occurs, the action of the spring 117 maintains the spool 104 against the seal 122. An intermediate step is shown in FIG. 27, and the final step is shown in FIG. 28. When the system reaches the position shown in FIG. 28, it is ready for another firing operation. It should be noted that in FIG. 28, all regions of the mechanism but for the inlet port 102 are held at atmospheric pressure. The notch 121 on the member 120 allows chamber 132 to communicate with the exhaust port 126, notwithstanding the contact between element 120 and the port 110.

The vent 124, communicating with the vent chamber 128, is provided to ensure that sluggish operation of the spool and pistons is prevented. In this manner, no pressure buildup occurs between diaphragms 106 and 108.

With particular reference, now, to FIG. 2 and FIGS. 29 through 35, the construction and operation of the gearbox will be explained. As best seen in FIG. 2, the rear portion of the driving member 28 is fitted with a yolk adapted to be engaged by the forward end of the output shaft 116. When the power unit 17 is fired, the output shaft 116, the driving member 28 and the pusher element 54 are driven forward and effect the formation of a rectangular staple against the anvil 62.

When the member 28 is thrust forward, the inclined surface 32, integral with member 28, moves forward and engages the plunger 34, which plunger 34 moves downwardly against the compression in the biasing spring 35.

As is best shown in FIG. 2, the front surface of the plunger 34 is provided with a notch 152, which notch engages a flange 154 fitted on the bottom ofthe rear surface of a triangular carrier plate 156. Thus, when the member 28 is thrust forward and the inclined surface 32 engages the plunger 34, the notch 152 in the plunger 34 causes the triangular carrier plate 156 to move downwardly due to the interaction between the notch 152 and the flange 154. In FIG. 34, it can be seen that the flange 154 extends a substantial distance across the triangular carrier plate 156, which carrier plate 156 is adapted to pivot at 157. This arrangement is further shown in FIG. 35 where there are also shown a pair of pins 161 and 163, mounted in the plunger 34, which pins serve to prevent wear on the flange 154 of the triangular carrier plate 156.

In FIGS. 2 and 33, the relative positions of the plunger 34 and the triangular carrier plate 156 are shown when the driving member 28 is out of engagement with the plunger 34. FIG. 34 shows the relative positions of these elements when the plunger 34 engages the inclined surface 32 on the driving member 28 during the stapling operation. When comparing FIGS. 33 and 34, then, it is readily seen that when the plunger 34 moves downwardly, the carrier plate 156 pivots in a counterclockwise direction around its pivot point 157.

With continuing reference to FIG. 33, a pawl 158 is shown mounted on the triangular carrier plate 156 by means of a pivot pin 160. The forwardmost surface of the pawl 158 is adapted to engage the surface of a six-toothed ratchet 159. It is seen, though, that in its rest position, the pawl 158 is out of engagement with the teeth of the ratchet 159. The movement of the pawl 158 is restricted by a pin 162, mounted on the rear surface of the pawl and extending through a hole 164 in the carrier plate 156. A second pawl 168 is pivotally mounted on a pin 170 secured to the housing of the gearbox and thus independent of both the carrier plate 156 and the pawl 158. Pawls I58 and 168 are, however, biased towards the ratchet 159 by means ofa spring 166. Spring 166 may be replaced by a pair of tension springs (not shown) mounted on the respective pivot pins of the pawls 158 and 168. Pawl 168 serves as a stop member for limiting the rotation of the ratchet 159.

On the lower portion of the carrier plate 156 is an extension carrying a pin 172. Pin 172 extends forwardly a distance sufficient to engage a depression in a clover-shaped cam 174 which serves to positively position the elements of the gearbox when the instrument is in its readiness mode.

With reference to FIG. 32, a main drive gear 176 is shown to be mounted on the same axis that carries the ratchet 159 and the cam 174. These elements move together and in unison. FIG. 31 shows that the main drive gear 176 engages two pinion gears 180, the ratio between the main drive gear 176 and the pinion gears 180 being 6 to 1. In this manner, when the ratchet 159 is turned through the rotation necessary to move from one tooth to the next, each pinion gear 180 turns one complete revolution.

Each pinion gear 180 is mounted on a shaft 181 which terminates in a slot 183. Each slot 183 is adapted to engage a respective extension 60 integral with each screw 46. In this manner, when the pinion gear turns through one revolution, the staples are driven forward one staple unit.

With particular reference, now, to FIGS. 33 through 35, the operation of the gearbox will be described. Prior to firing the skin stapler (FIG. 33), the driving member 28 is in its rearwardmost position. The plunger 34, with its notch 152, is in its upper position, biased by the spring 35. Thus, the carrier plate 156 is in its full clockwise position, pawl 168 being in engagement with a tooth on the rachet 159. The driving region of pawl 158 is removed from the nearest tooth on the ratchet 159 to allow for slight play in the plate 156 before the ratchet 159 is rotated. This allows the pin 172 to disengage from the depression in the cam 174.

When the driving member 28 moves forward, during a stapling operation, plunger 34 moves down against the force of the spring 35. During the downward movement of the plunger 34, the carrier plate 156 rotates in a counterclockwise direction about its pivot point 157, pawl 158 rotating the ratchet 159.

In FIG. 34, the elements of the gearbox are shown after the pawl 158 has rotated the ratchet 159 through its maximum angle. This maximum angle is greater than that needed to advance each staple one staple unit. Thus, the gearbox elements are overdriven.

In FIG. 35, the gearbox elements are shown in their overdriven condition, but after the plunger 32 is partially raised due to the member 28 having moved rearwardly for part of its return stroke.

The gearbox operation will now be described. In FIG. 33, the gears are at rest, the member 28 retracted and waiting for an activating charge. The pin 172 is in engagement with a depression in the cam 174 and thus the ratchet 159, the main gear 176 and the pinion gears 180 are locked in place. In this position, the slots 183 are aligned as shown in FIGS. 29 and 30 to allow for the easy insertion or removal of a staple-carrying cartridge,

When the powering unit is fired, the driving member is thrust forward and its inclined surface 32 moves plunger 34 downward. Plunger 34 carries with it plate 156 which rotates in a counterclockwise direction.

During the first stage of movement, no gears turn. The play between pawl 158 and the nearest tooth in the ratchet I59 al'-- lows the pin 172 to move out of the depression in cam 174 before gear rotation. The necessity for this is obvious. Then pawl 158 engages a tooth on the ratchet 174 and rotates the ratchet, the main gear 176 and the pinion gears 180 to the positions shown in FIG. 34.

In the position shown in FIG. 34, the gears are overindexed. That is, they are driven more than is necessary to move the staples one staple unit. This is clone to ensure that the slots I83 associated with pinion gears 180 are in proper alignment for insertion or removal of a cartridge.

After the stapling operation, member 28 moves rearwardly, thus allowing the plunger 34 to ride upwardly on the incline 32. This moves the plate 156 and hence the pin 172 into the position shown in FIG. 35, with the pin 172 moving toward the surface of the cam 174. From this position, the spring 35 urges the pin 172 against the surface of the cam 174, with the pin coming into contact with the cam at one of its depressions. Because of the stopping position of this cam, the action of the pin 172 rotates cam 174 in a clockwise direction. This rotation continues until the gear mechanism is in the position shownin FIG. 33, in readiness for another stapling maneuver.

With reference, now, to FIG. 36, a second embodiment of the main body portion of the inventive skin stapler will be described. The main body portion is shown generally at 20.0

and comprises a region 202 for mounting the cartridge 12 described above with reference to FIGS. 3 through 13. A cam 204, similar to the cam 22 shown in FIG. 2, is provided. The main body portion 200 has a handle region 206 and a trigger 208. A region 210 serves to house a power unit identical with that described in FIGS. 23 through 28.

The handle 206 is threaded at the extremity thereof and is fitted with a plug 214. A pressurized cartridge 216 is filled with a gas such as carbon dioxide and held in the handle 206, and its charge is fed to the powering unit 210 by means of a passage 218, which passage terminates in a chamber 220, similar to the gas inlet port 202 shown in FIG. 23.

The trigger 208 is similar to the triggering mechanism 136 shown in FIG. 24. Therefore, when the trigger 208 is depressed, the output shaft of the power unit is moved slightly so as to initiate the power stroke necessary to drive and form a staple.

When the surgeon uses the instrument 200, all four fingers of one hand wrap around the handle 206 with the thumb of that hand resting against trigger 208. The anvil of the staplecarrying cartridge 12 is pressed against the region of the body to be stapled and the trigger 208 is depressed. The power stroke is initiated, the staple is formed and the unit is then removed from the stapled area and moved to the next area where it is desired to position a staple. The operation is re peated until the incision is completely sutured.

FIG. 37 is a cross section viewed in the direction of arrows 3737 of FIG. 36. From this Figure, it is evident that the passage 218 communicates with the forwardmost bore in the handle 206 at a position removed from the center thereof. The offcenter position is to ensure that the gas passage is not blocked by any portion of the gas cartridge or the cartridgepiercing mechanism.

In FIGS. 36 and 37, it can be seen that the handle 206 is fitted with a bore 222 adapted to house the gas cartridge 216 and a bore 224 serving to mount the cartridge-piercing mechanism described below. Bores 222 and 224 are communicated by means of a sloped wall.

As indicated above, it has been found that when gas-powering units have been used in the past, the pin which serves to pierce the gas cartridge tends to wear rapidly. As also noted above, it is contemplated that a loaded and sterilized staplecarrying cartridge be packaged with a filled and sterilized gascontaining cartridge. To overcome the drawbacks noted above, a piercing mechanism which is simple in design and inexpensive in cost is fitted on a gas cartridge and is adapted to break the seal of the gas cartridge when same is positioned within the handle 206 of the instrument 200 and screwed into place by means of the plug 214.

With reference, now, to FIGS. 38 and 39, the novel cartridge-piercing mechanism will be described. A bottle containing a pressurized gas such as carbon dioxide is shown at 216. The mouth of the bottle 216 is fitted with a conventional seal 226. A cap 228 is positioned over the mouth of the bottle 216 and an O-ring 230 serves to seal the joint between the bottle 216 and the cap 228. When packaged and ready for use, a pin shown generally at 232 is positioned between an inwardly directed flange 234 on the cap 228 and the seal 226 of the bottle 216. The pin 232 comprises a main body region 236, a pointed region 238 and an end region 240. The end region 240 is fitted with a slot 242 extending entirely thereacross. A passage 246 passes from the extremity of the pin 238 to the extremity of the slot 242.

As seen in FIGS. 36 and 38, when the plug 214 is screwed into the handle 206, the bottle 216 is urged to move toward the base 244 of the bore 224. When this takes place, region 240 abuts the base 244 and thus the pointed region 238 of the pin 232 pierces the seal 226 of the bottle 216. Gas from the bottle 216 is thus forced through the passage 246, out of the slot 242 and into the chamber defined by the bore 224.

The cap 228 has a thin extension 248 which is flexible and which comfortably rests against the wall of the bore 224. When the pressurized gas passes into the chamber defined by the bore 224, it rushes into the region between the main body of the cap 228 and the extension 248, thus forcing the extension 248 against the wall of the bore 224. In this manner, the passage of gas is prevented from backing up into the handle 206.

Above, there have been described specific embodiments of the present invention. It should be noted, however, that the above description was given for illustrative purposes only and that many alterations and modifications may be practiced by those skilled in the art without departing from the spirit or the scope of the invention. it is the intent therefore that the present invention not be limited to the above but be limited only as defined in the appended claims.

What is claimed is:

l. A surgical stapling instrument for applying sterilized staples to the disunited skin of a patient for effecting a joining of the skin, the instrument being adapted to-accept an elongated staple-carrying cartridge having anvil means at the forwardmost region of said staple-carrying cartridge and being adapted to house a plurality of staples, the crossbars of said staples being transverse to the length of said cartridge and the prongs of said staples facing said anvil means; a pusher element slidably mounted within said cartridge for ejecting staples from said cartridge and for forming said staples around said anvil means; and means for advancing said staples along the length of said cartridge; said surgical stapling instrument comprising a main body portion; means for mounting said staple-carrying cartridge at its region remote from said anvil, on the main body portion; means to activate said staple-advancing means for driving the staples toward said anvil means; and means for driving the pusher element forward to eject a staple from the staple-carrying cartridge and to form said staple around said anvil means.

2. The instrument as defined in claim 1, wherein, while the instrument is in its readiness state, all of the staples housed in the staple-carrying cartridge lie in a first plane; and wherein said pusher element lies in a second plane and serves to maintain the staples in position in said first plane.

3. The instrument as defined in claim 2, and further comprising means adjacent said anvil means for conveying the forwardmost staple from its plane into the plane of said pusher element during the advance of said staples.

4. The instrument as described in claim 3, wherein said staple-advancing means comprises at least one threaded screw, and wherein the staples have their crossbars engaged in the threads of said at least one screw.

5. The instrument as defined in claim 4, wherein said staplecarrying cartridge is provided with a ledgelike formation for guiding the staples, wherein the region of the ledgelike formation nearest the anvil is inclined toward the plane of the pusher element, and wherein the threads of the at least one screw decrease to a zero depth at the region adjacent the anvil.

6. The instrument as described in claim 1, wherein said anvil means extends parallel to the crossbars of said staples; wherein said anvil means has a length substantially less than the length of said crossbars; and wherein the forwardmost part of said pusher element comprises a pair of tines which are spaced apart a distance slightly in excess of the length of said anvil means plus twice the diameter of a staple.

7. The instrument as described in claim 6, wherein each tine of said pusher element has a chamfer thereon, the chamfers being positioned at the side of the respective tines nearest the anvil means.

8. The instrument as defined in claim 7, wherein the forwardmost surfaces of the tines and the surfaces of the chamfer are V-shaped.

9. The instrument as defined in claim 1, and further comprising means for indicating the number of staples remaining in said staple-carrying cartridge.

10. The instrument as defined in claim 9, wherein said staple-indicating means comprises at least one element slidably mounted in and adapted to travel along the length of the staple-carrying cartridge.

11. The instrument as described in claim 10, wherein said at least one element is, at all times, adjacent and equally spaced from the rearwardmost staple housed within the cartridge, and wherein said at least one element travels with said rearwardmost staple.

12. The instrument as defined in claim 11, wherein said means for advancing the staples takes the form of at least one threaded screw; and wherein said at least one indicating element is advanced by the means serving to advance the staples.

13. The instrument as defined in claim 12, wherein said at least one indicating element is visible through one ofa plurality of bores in the surface of said staplecarrying cartridge.

14. The instrument as defined in claim 13, wherein said means for advancing the staples takes the form of two parallel screws; wherein a pair of staple-indicating elements are provided; wherein each staple-indicating element has a projection thereon adapted to engage the threads of a respective screw; and wherein said staple-carrying cartridge has a plurality of bores running in alignment with each screw, the bores associated with each screw being staggered with respect to each other.

16. The instrument as defined in claim 15, and further comprising means for triggering a gas drive mechanism; and wherein said gas drive mechanism, upon triggering, serves to advance a staple into a position ready to be ejected from the cartridge and formed around the anvil, and further serves to drive the pusher elements forward to eject the readiness staple and to form same around said anvil means.

15. The instrument as defined in claim 1, wherein said staple-advancing means and said pusher means are driven by a gas under pressure.

17. The instrument as defined in claim 16, and further comprising a driving member adapted to be thrust toward said anvil means upon the triggering of said gas drive mechanism; pusher-engaging means mounted on the forward region of said driving member and adapted to engage and control the motion of said pusher element; and means associated with said drive member for initiating the advancement of staples.

18. The instrument as defined in claim 17, wherein said means for initiating the advancement of staples comprises an inclined surface on said driving member.

19. The instrument as defined in claim 18, and further comprising: a plunger having an inclined surface thereon, adapted to engage the inclined surface of said driving member and adapted to reciprocate in response to the action of said driving member; and wherein said means for advancing the staples are associated with said plunger to advance the staples one staple unit each time the plunger is acted upon by said driving member.

20. The instrument as described in claim 1, and further comprising: a driving member slidably mounted in said main body portion; a pusher-engaging.extension at the forward region of said driving member; and inclined surface at the midregion of said driving member; a plunger having an inclined surface at one extremity thereof, slidably mounted in said main body portion; biasing means for urging said plunger toward said driving member so that the inclined surface on said plunger is driven toward said inclined surface on the driving member; gear means associated with said plunger and with said staple-advancing means; and power means for moving said driving member so that its inclined surface causes said plunger to move against said biasing means and thus causing said gear means to advance said staples and further causing said pusher to be driven forwardly so as to eject a staple and form same around said anvil means.

22. The instrument as defined in claim 20, wherein said staple-advancing means comprises a pair of threaded screws extending along the length of said cartridge, and staples being carried in the threads of said screws, and further comprising a thin flat extension on the extremity of each screw remote from said anvil means; a pinion gear in said gear means, which pinion gear is rotated when said plunger is acted upon by the inclined surface of said driving member; and a slotlike extension on each pinion gear serving to engage the thin elongated extension on each screw.

22. The instrument as set forth in claim 21, wherein said gear means is adapted to rotate each screw in said staple-carrying cartridge so that each staple but the first is advanced in excess of one staple unit for each forward thrust of said driving member; and further including means in said gear means to reverse the direction of rotation of said screws from the direction in which they rotate during the forward motion of said driving member, the means to reverse the rotation serving to rotate the screws an amount sufficient to ultimately advance each staple one staple unit.

23. A staple-ejecting cartridge adapted to be sterilized, packaged and mounted on a skin-stapling instrument, the cartridge comprising: an elongated body adapted to house a plurality of staples, each staple having its crosspiece transverse to the length of said elongated body and having its prongs facing one end of said body; an anvil secured to the end of said body toward which the staple prongs face; a pusher element in the plane of said anvil for reciprocating along the length of said body, for ejecting said staples singly, and for forming said staples around said anvil; means to guide said staples along said body; and means to advance said staples along said body.

24. The cartridge as defined in claim 23, wherein said staples are housed and guided in a plane removed from the plane of said pusher element.

25. The cartridge as defined in claim 24, and further comprising means to position the staple nearest said anvil into the plane of said pusher element before said pusher element is driven to eject and form a staple.

26. The cartridge of claim 25, wherein the staples are guided by a ledge along the interior of said elongated body and wherein the region of said ledge nearest the anvil is inclined so as to position the nearest staple in the plane of the pusher element.

27. The cartridge as described in claim 26, wherein said means to advance the staples comprises at least one threaded screw and wherein the threads of said screw at the region nearest the anvil diminish in depth so as to position the nearest staple in the plane of the pusher element.

28. The cartridge of claim 23, wherein said means to advance the staples comprises at least one threaded screw whose threads serve to control the positions of said staples.

29. The cartridge of claim 28, wherein each screw is terminated at its end remote from said anvil by a projection adapted to engage an element serving to control the rotation of that screw.

30. The cartridge of claim 23, and further comprising means to effect a mounting of said cartridge on a skin-stapling instrument and means to maintain the alignment of the mounted cartridge with its associated instrument.

31. The cartridge of claim 23, and further comprising means to indicate the number of staples remaining in said cartridge.

32. The cartridge as recited in claim 31, wherein said indicating means is advanced in unison said said staples.

33. The cartridge as defined in claim 32, wherein said means for advancing the staples advance said staples in the threads of at least one screw and wherein said indicating means are advanced by the threads of said at least one screw.

34. The cartridge of claim 33, wherein said elongated body has a plurality of aligned bores therethrough, wherein said indicating means comprise at least one'pad, and wherein said at least one pad is visible through a single bore at a time depending upon the number of staples remaining in the cartridge.

35. The cartridge as recited in claim 23, wherein the region of said pusher element nearest the anvil has a pair of tinesv thereon and wherein the anvil and the tines are related so that when said pusher element is in its forwardmost position, its tines surround said anvil.

36. The cartridge of claim 35, wherein the spacing between said tines is equal to the length of said anvil plus twice the diameter of a staple plus a small tolerance.

37. The cartridge of claim 36, wherein the surface of each tine nearest the anvil is provided with a chamfer.

38. The cartridge of claim 37, wherein the surfaces of said pusher element which serve to contact the staples are V- shaped.

39. The cartridge as recited in claim 23, and further comprising means for moving the formed staples out of the plane of said anvil after each stapling operation. a

40. The cartridge as defined in claim 39, wherein said means for moving the formed staples comprises at least one resilient member.

41. The cartridge of claim 40, wherein the pusher element serves to disable said resilient member during the staple-forming operation and serves to free said resilient member when retracting from a staple-forming operation.

Claims (41)

1. A surgical stapling instrument for applying sterilized staples to the disunited skin of a patient for effecting a joining of the skin, the instrument being adapted to accept an elongated staple-carrying cartridge having anvil means at the forwardmost region of said staple-carrying cartridge and being adapted to house a plurality of staples, the crossbars of said staples being transverse to the length of said cartridge and the prongs of said staples facing said anvil means; a pusher element slidably mounted within said cartridge for ejecting staples from said cartridge and for forming said staples around said anvil means; and means for advancing said staples along the length of said cartridge; said surgical stapling instrument comprising a main body portion; means for mounting said staple-carrying cartridge at its region remote from said anvil, on the main body portion; means to activate said staple-advancing means for driving the staples toward said anvil means; and means for driving the pusher element forward to eject a staple from the staple-carrying cartridge and to form said staple around said anvil means.
2. The instrument as defined in claim 1, wherein, while the instrument is in its readiness state, all of the staples housed in the staple-carrying cartridge lie in a first plane; and wherein said pusher element lies in a second plane and serves to maintain the staples in position in said first plane.
3. The instrument as defined in claim 2, and further comprising means adjacent said anvil means for conveying the forwardmost staple from its plane into the plane of said pusher element during the advance of said staples.
4. The instrument as described in claim 3, wherein said staple-advancing means comprises at least one threaded screw, and wherein the staples have their crossbars engaged in the threads of said at least one screw.
5. The instrument as defined in claim 4, wherein said staple-carrying cartridge is provided with a ledgelike formation for guiding the staples, wherein the region of the ledgelike formation nearest the anvil is inclined toward the plane of the pusher element, and wherein the threads of the at least one screw decrease to a zero depth at the region adjacent the anvil.
6. The instrument as described in claim 1, wherein said anvil means extends parallel to the crossbars of said staples; wherein said anvil means has a length substantially less than the length of said crossbars; and wherein the forwardmost part of said pusher element comprises a pair of tines which are spaced apart a distance slightly in excess of the length of said anvil means plus twice the diameter of a staple.
7. The instrument as described in claim 6, wherein each tine of said pusher element has a chamfer thereon, the chamfers being positioned at the side of the respective tines nearest the anvil means.
8. The instrument as defined in claim 7, wherein the forwardmost surfaces of the tines and the surfaces of the chamfer are V-shaped.
9. The instrument as defined in claim 1, and further comprising means for indicating the number of staples remaining in said staple-carrying cartridge.
10. The instrument as defined in claim 9, wherein said staple-indicating means comprises at least one element slidably mounted in and adapted to travel along the length of the staple-carrying cartridge.
11. The instrument as described in claim 10, wherein said at least one element is, at all times, adjacent and equally spaced from the rearwardmost staple housed within the cartridge, and wherein said at least one element travels with said rearwardmost staple.
12. The instrument as defined in claim 11, wherein said means for advancing the staples takes the form of at least one threaded screw; and wherein said at least one indicating element is advanced by the means serving to advance the staples.
13. The instrument as defined in claim 12, wherein said at least one indicating element is visible through one of a plurality of bores in the surface of said staple-carrying cartridge.
14. The instrument as defined in claim 13, wherein said means for advancing the staples takes the form of two parallel screws; wherein a pair of staple-indicating elements are provided; wherein each staple-indicating element has a projection thereon adapted to engage the threads of a respective screw; and wherein said staple-carrying cartridge has a plurality of bores running in alignment with each screw, the bores associated with each screw being staggered with respect to each other.
15. The instrument as defined in claim 1, wherein said staple-advancing means and said pusher means are driven by a gas under pressure.
16. The instrument as defined in claim 15, and further comprising means for triggering a gas drive mechanism; and wherein said gas drive mechanism, upon triggering, serves to advance a staple into a position ready to be ejected from the cartridge and formed around the anvil, and further serves to drive the pusher elements forward to eject the readiness staple and to form same around said anvil means.
17. The instrument as defined in claim 16, and further comprising a driving member adapted to be thrust toward said anvil means upon the triggering of said gas drive mechanism; pusher-engaging means mounted on the forward region of said driving member and adapted to engage and control the motion of said pusher element; and means associated with said drive member for initiating the advancement of staples.
18. The instrument as defined in claim 17, wherein said means for initiating the advancement of staples comprises an inclined surface on said driving member.
19. The instrument as defined in claim 18, and further comprising: a plunger having an inclined surface thereon, adapted to engage the inclined surface of said driving member and adapted to reciprocate in response to the action of said driving member; and wherein said means for advancing the staples are associated with said plunger to advance the staples one staple unit each time the plunger is acted upon by said driving member.
20. The instrument as described in claim 1, and further comprising: a driving member slidably mounted in said main body portion; a pusher-engaging extension at the forward region of said driving member; and inclined surface at the midregion of said driving member; a plunger having an inclined surface at one extremity thereof, slidably mounted in said main body portion; biasing means for urging said plunger toward said driving member so that the inclined surface on said plunger is driven toward said inclined surface on the driving member; gear means associated with said plunger and with said staple-advancing means; and power means for moving said driving member so that its inclined surface causes said plunger to move against said biasing means and thus causing said gear means to advance said staples and further causing said pusher to be driven forwardly so as to eject a staple and form same around said anvil means.
22. The instrument as defined in claim 20, wherein said staple-advancing means comprises a pair of threaded screws extending along the length of said cartridge, and staples being carried in the threads of said screws, and further comprising a thin flat extension on the extremity of each screw remote from said anvil means; a pinion gear in said gear means, which pinion gear is rotated when said plunger is acted upon by the inclined surface of said driving member; and a slotlike extension on each pinion gear serving to engage the thin elongated extension on each screw.
22. The instrument as set forth in claim 21, wherein said gear means is adapted to rotate each screw in said staple-carrying cartridge so that each staple but the first is advanced in excess of one staple unit for each forward thrust of said driving member; and further including means in said gear means to reverse the direction of rotation of said screws from the direction in which they rotate during the forward motion of said driving member, the means to reverse the rotation serving to rotate the screws an amount sufficient to ultimately advance each staple one staple unit.
23. A staple-ejecting cartridge adapted to be sterilized, packaged and mounted on a skin-stapling instrument, the cartridge comprising: an elongated body adapted to house a plurality of staples, each staple having its crosspiece transverse to the length of said elongated body and having its prongs facing one end of said body; an anvil secured to the end of said body toward which the staple prongs face; a pusher element in the plane of said anvil for reciprocating along the length of said body, for ejecting said staples singly, and for forming said staples around said anvil; means to guide said staples along said body; and means to advance said staples along said body.
24. The cartridge as defined in claim 23, wherein said staples are housed and guided in a plane removed from the plane of said pusher element.
25. The cartridge as defined in claim 24, and further comprising means to position the staple nearest said anvil into the plane of said pusher element before said pusher element is driven to eject and form a staple.
26. The cartridge of claim 25, wherein the staples are guided by a ledge along the interior of said elongated body and wherein the region of said ledge nearest the anvil is inclined so as to position the nearest staple in the plane of the pusher element.
27. The cartridge as described in claim 26, wherein said means to advance the staples comprises at least one threaded screw and wherein the threads of said screw at the region nearest the anvil diminish in depth so as to position the nearest staple in the plane of the pusher element.
28. The cartridge of claim 23, wherein said means to advance the staples comprises at least one threaded screw whose threads serve to control the positions of said staples.
29. The cartridge of claim 28, wherein each screw is terminated at its end remote from said anvil by a projection adapted to engage an element serving to control the rotation of that screw.
30. The cartridge of claim 23, and further comprising means to effect a mounting of said cartridge on a skin-stapling instrument and means to maintain the alignment of the mounted cartridge with its associated instrument.
31. THe cartridge of claim 23, and further comprising means to indicate the number of staples remaining in said cartridge.
32. The cartridge as recited in claim 31, wherein said indicating means is advanced in unison said said staples.
33. The cartridge as defined in claim 32, wherein said means for advancing the staples advance said staples in the threads of at least one screw and wherein said indicating means are advanced by the threads of said at least one screw.
34. The cartridge of claim 33, wherein said elongated body has a plurality of aligned bores therethrough, wherein said indicating means comprise at least one pad, and wherein said at least one pad is visible through a single bore at a time depending upon the number of staples remaining in the cartridge.
35. The cartridge as recited in claim 23, wherein the region of said pusher element nearest the anvil has a pair of tines thereon and wherein the anvil and the tines are related so that when said pusher element is in its forwardmost position, its tines surround said anvil.
36. The cartridge of claim 35, wherein the spacing between said tines is equal to the length of said anvil plus twice the diameter of a staple plus a small tolerance.
37. The cartridge of claim 36, wherein the surface of each tine nearest the anvil is provided with a chamfer.
38. The cartridge of claim 37, wherein the surfaces of said pusher element which serve to contact the staples are V-shaped.
39. The cartridge as recited in claim 23, and further comprising means for moving the formed staples out of the plane of said anvil after each stapling operation.
40. The cartridge as defined in claim 39, wherein said means for moving the formed staples comprises at least one resilient member.
41. The cartridge of claim 40, wherein the pusher element serves to disable said resilient member during the staple-forming operation and serves to free said resilient member when retracting from a staple-forming operation.
US3643851A 1969-08-25 1969-08-25 Skin stapler Expired - Lifetime US3643851A (en)

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CA953997A1 (en) grant
GB1328841A (en) 1973-09-05 application
DE2065742A1 (en) 1976-06-24 application
CA953997A (en) 1974-09-03 grant
FR2059173A5 (en) 1971-05-28 application
GB1328842A (en) 1973-09-05 application
DE2042158B2 (en) 1975-10-02 application
JPS4842438B1 (en) 1973-12-12 grant
JPS5016103B1 (en) 1975-06-10 grant
DE2042158A1 (en) 1971-03-11 application

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