CN205251611U - Cutting stitching instrument - Google Patents

Abstract

The utility model discloses a cutting stitching instrument, including ejector pin pole, cutting knife, ejector pin mechanism and nail storehouse, the ejector pin pole is used for promoting the cutting knife reaches ejector pin mechanism motion, ejector pin mechanism is used for promoting to sew up the nail, the nail storehouse is including being used for holding sew up sewing up the nail holding tank and being located of nail sew up the sword groove at nail holding tank middle part, sword inslot surface is formed with a plurality of protruded structure, works as ejector pin mechanism promotes the cutting knife passes during the sword groove, the cutting knife contact is relative the protruded structure orientation cutting stitching instrument's distal end motion. The utility model discloses an internal surface in the sword groove sets up a plurality of protruded structure for the cutting knife passes during the sword groove with protruded structure interact, protruded structure is less with the area of contact of cutting knife, and frictional force between the two is less, can guarantee the cutting knife and march smoothly in the sword inslot.

Description

Stapler

Technical field

The utility model relates to medical instruments field, relates in particular to a kind of stapler.

Background technology

Stapler is a kind of conventional surgical operating instrument, and it can complete simultaneously sews up and cutting action, greatly saves doctor's operating time, reduces amount of bleeding, improves success rate of operation. The cutter of existing stapler arrive while organizing through the cutter groove in nail bin, and cutter groove and the side of cutter are face and the contacting of face, and the frictional force between cutter groove and cutter is larger, and cutter groove obstruction cutter are towards histokinesis.

Summary of the invention

The purpose of this utility model is to provide a kind of stapler.

For realizing one of above-mentioned utility model object, the utility model one embodiment provides a kind of stapler, comprise ejector pin bar, cutter, ejector pin mechanism and nail bin, described ejector pin bar is used for promoting described cutter and described ejector pin mechanism kinematic, described ejector pin mechanism is used for promoting suturing nail, described nail bin comprises the staple containing groove for holding described suturing nail and is positioned at the cutter groove at described staple containing groove middle part, described cutter groove inner surface is formed with some outstanding structures, in the time that cutter described in described ejector pin mechanism urges pass described cutter groove, described cutter contact relatively described outstanding structure are towards the distal movement of described stapler.

As the further improvement of the utility model one embodiment, described cutter groove inner surface is also formed with the some sunk structures that connect some described outstanding structures, and described outstanding structure and described sunk structure are combined to form square wave-shaped configuration.

As the further improvement of the utility model one embodiment, described cutter groove also comprises cutter groove body, and the surface of described outstanding structure is positioned at corresponding described cutter groove body institute planar, and the surface of described sunk structure is lower than described cutter groove body place plane.

As the further improvement of the utility model one embodiment, in the time that cutter described in described ejector pin mechanism urges pass described cutter groove, the relatively described outstanding structure of described cutter and described cutter groove body produce respectively the first frictional force and the second frictional force, and described the first frictional force is less than described the second frictional force.

As the further improvement of the utility model one embodiment, described cutter groove body is positioned at the two ends of described cutter groove, and described outstanding structure and described sunk structure are between the described cutter groove body at described cutter groove two ends.

As the further improvement of the utility model one embodiment, described nail bin comprises the nail bin face that is positioned at its far-end, and described outstanding structure extends to described nail bin face.

As the further improvement of the utility model one embodiment, the bearing of trend of described outstanding structure is parallel to the direction of described stapler near-end towards far-end.

As the further improvement of the utility model one embodiment, described cutter groove comprises the first side wall and the second sidewall that lay respectively at described cutter both sides, on described the first side wall and described the second sidewall, is all formed with described outstanding structure.

As the further improvement of the utility model one embodiment, the described outstanding structure on described the first side wall and described the second sidewall is oppositely arranged.

As the further improvement of the utility model one embodiment, the near-end of described cutter is formed with at least one protuberance, described ejector pin mechanism comprises ejector pin pedestal, on described ejector pin pedestal, be formed with at least one groove of corresponding described protuberance, described groove inner surface is formed with some fins, when described stapler is during in cut state, the relatively described ejector pin of described cutter mechanism is towards the distal movement of described stapler, and described protuberance contact the relatively described fin of described cutter move.

Compared with prior art, the beneficial effects of the utility model are: the utility model is by arranging some outstanding structures at the inner surface of cutter groove, while making cutter pass described cutter groove and described outstanding structural interaction, the contact area of outstanding structure and cutter is less, frictional force is between the two less, can ensure that cutter advance smoothly in cutter groove.

Brief description of the drawings

Fig. 1 is the stapler three-dimensional structure diagram of the utility model one embodiment;

Fig. 2 is the stapler explosive view of the utility model one embodiment;

Fig. 3 is the stapler part-structure explosive view of the utility model one embodiment;

Fig. 4 is the stapler part-structure explosive view of the utility model one embodiment;

Fig. 5 a-Fig. 5 c is the schematic diagram that the cutter of the utility model one embodiment are assembled into knife rest;

Fig. 6 a is that the stapler of the utility model one embodiment is sewed up state the first angle part profile;

Fig. 6 b is that the stapler of the utility model one embodiment is sewed up state the second angle part profile;

Fig. 7 a is the stapler cut state first angle part profile of the utility model one embodiment;

Fig. 7 b is the stapler cut state second angle part profile of the utility model one embodiment;

Fig. 8 is the nail bin stereogram of the utility model one embodiment;

Fig. 9 is A-A profile in Fig. 8;

Figure 10 is the nail bin front view of the utility model one embodiment;

Figure 11 a is the primary importance profile of the stapler original state of the utility model one embodiment;

Figure 11 b is the second place profile of the stapler original state of the utility model one embodiment;

Figure 12 a is the primary importance profile of the stapler closure state of the utility model one embodiment;

Figure 12 b is the second place profile of the stapler closure state of the utility model one embodiment;

Figure 13 a is the primary importance profile that the stapler of the utility model one embodiment is sewed up cut state;

Figure 13 b is the second place profile that the stapler of the utility model one embodiment is sewed up cut state.

Detailed description of the invention

Below with reference to detailed description of the invention shown in the drawings, the utility model is described in detail. But these embodiments do not limit the utility model, the conversion in structure, method or function that those of ordinary skill in the art makes according to these embodiments is all included in protection domain of the present utility model.

For clearly expressing described position and direction in the application, using exercises on apparatus author as reference, be near-end near one end of operator, be far-end away from one end of operator. Meanwhile, in this application, the below of definition stapler is the direction that gripping handle is extended by housing, relative with this below, is defined as the top of stapler.

As shown in Figure 1, in the utility model one embodiment, stapler 100 comprises housing 10, by the interior supporting construction of stretching out to far-end 20 of housing 10, is connected in the nail anvil seat 30 of supporting construction 20 far-ends. Nail anvil seat 30 can be fixedly connected with supporting construction 20, and the near-end below of housing 10 forms gripping handle 40. Stapler 100 also comprises nail bin groupware 50 and nail-anvil assembly 60. In the present embodiment, nail bin groupware 50 and nail-anvil assembly 60 are removably mounted on nail anvil seat 30, and match with the shape of nail anvil seat 30, so, can operating space Nei Dui physiological tissue carry out cutting and stitching operation less.

Coordinate Fig. 2-Fig. 4, nail bin groupware 50 has nail bin 51, this nail bin 51 comprises a nail bin face 511, is arranged with the staple containing groove 512 of a line or multirow on nail bin face 511 with interlace mode, and nail bin groupware 50 also comprises the ejector pin mechanism 52 and the cutting knife member that are arranged in nail bin 51. Ejector pin mechanism 52 can release suturing nail in staple containing groove 512, and cutting knife member comprises that a knife rest 53 and is arranged on the cutter 54 of knife rest 53 far-ends.

Ejector pin mechanism 52 comprises pushing slice of nail 522 for promoting described staple containing groove 512 interior suturing nails and for carrying the ejector pin pedestal 521 of described pushing slice of nail 522, the middle part of described pushing slice of nail 522 is provided with the slit 523 with these cutter 54 adaptations, to support the percussion operation of cutter 54. Here, pushing slice of nail 522 setting corresponding to staple containing groove 512, and the quantity of pushing slice of nail 522 is consistent with the quantity of staple containing groove 512.

In the utility model one embodiment, the far-end of nail bin groupware 50 is also connected with nail-anvil assembly 60, nail-anvil assembly 60 comprises nail anvil 61 and cutter anvil 62, and when nail bin groupware 50 is installed to nail anvil seat 30, this nail anvil 61 and cutter anvil 62 can be arranged on nail anvil seat 30 ordinatedly.

Stapler 100 also comprises percussion assembly, percussion assembly comprise be located at stapler 100 belows percussion handle 71, pulled the trigger the nail bin push rod 72 that handle 71 drives and connected the driving member of percussion handle 71 and nail bin push rod 72. Nail bin push rod 72 can be under the effect of percussion handle 71, drives nail bin groupware 50 to move to far-end from the near-end of stapler 100, with near nail-anvil assembly 60, finally makes nail bin groupware 50 and nail-anvil assembly 60 closures. Now, if be placed with physiological tissue between nail bin groupware 50 and nail-anvil assembly 60, this nail bin push rod 72 can drive nail bin groupware 50 near nail-anvil assembly 60 with Jia Bigai physiological tissue.

In the utility model one embodiment, percussion assembly also comprises ejector pin bar 73, it is engaged in nail bin push rod 72 slidably, ejector pin bar 73 is for promoting knife rest 53, in certain embodiments, ejector pin bar 73 is made as with the surface that knife rest 53 acts on the shape fitting each other, so that both do not depart from mutually.

The operating process of stapler 100 in the utility model one embodiment in the time sewing up cutting physiological tissue is as follows:

Complete after the operation of Jia Bi physiological tissue, percussion handle 71 is realized automatically reseting of percussion handle 71 towards the direction rotation away from gripping handle 40 under the drive of handle return spring (not shown).

In this process, ejector pin bar 73 percussion assembly percussion effect under towards described stapler 100 distal movement, ejector pin bar 73 promotes knife rest 53, cutter 54 and ejector pin mechanism 52 towards nail-anvil assembly 60 direction motions, the suturing nail that ejector pin mechanism 52 promotes in staple containing groove 512 clenches on physiological tissue, then ejector pin bar 73 continues to promote knife rest 53, and cutter 54 cut corresponding physiological tissue.

Reach after percussion completion status at stapler 100, can be by pressing button release 80, with nail bin groupware 50 and the nail-anvil assembly 60 of open closed.

Certainly, if desired reuse this stapler, can replace new nail bin groupware 50 and/or nail-anvil assembly 60, thereby carry out next cutting and stitching.

In the present embodiment, between the force surface 531 of the stress surface 5211 of described ejector pin pedestal 521 near-ends and described knife rest 53 far-ends, be provided with the shell fragment 55 of at least one undulate, described cutter 54 are fixed on described knife rest 53 through described slit 523 and described shell fragment 55; Wherein, when described stapler 100 is in the time sewing up state, described ejector pin bar 73 promotes described knife rest 53 and moves until described ejector pin mechanism 52 releases described suturing nail to complete stitching towards described stapler 100 far-ends, there is not deformation in described shell fragment 55, and the blade face 541 of described cutter 54 is lower than the flank of tooth 5221 of described ejector pin mechanism 52 far-ends; When described stapler 100 is during in cut state, described ejector pin bar 73 continues to promote described knife rest 53, described ejector pin mechanism 52 does not move, and described knife rest 53 drives described shell fragment 55 that deformation occurs, and described knife rest 53 drives described cutter 54 to protrude out the described flank of tooth 523 and completes cutting.

Here, when described stapler 100 is in the time sewing up state, knife rest 53, shell fragment 55, cutter 54 and nail pushing structure 52 form one, under the impetus of ejector pin bar 73, knife rest 53, shell fragment 55, cutter 54 and nail pushing structure 52 move towards stapler 100 far-ends together, in this process, knife rest 53, shell fragment 55, cutter 54 and nail pushing structure 52 are relatively static, only there is not deformation as the syndeton between knife rest 53 and ejector pin mechanism 52 in shell fragment 55, ejector pin mechanism 52 is by the suturing nail release in staple containing groove 512 and in tissue sew, simultaneously the blade face 541 of cutter 54 does not carry out the cutting operation to tissue lower than the flank of tooth 523 of described ejector pin mechanism 52, finally ejector pin mechanism 52 is subject to stopping of nail-anvil assembly 60 and cannot continues towards stapler 100 distal movement, when described stapler 100 is during in cut state, because ejector pin mechanism 52 cannot move, in this process, shell fragment 55 is subject to the active force of ejector pin mechanism 52 and knife rest 53 simultaneously and compressional deformation occurs, make knife rest 53 can continue to move near nail pushing structure 52, knife rest 53 drives the relatively described nail pushing structure 52 of cutter 54 to continue the distal movement towards stapler 100, and the tissue that opposite joint gets togather until the blade face 541 of cutter 54 protrudes out the described flank of tooth 5221 carries out cutting operation.

Compared to prior art, the stapler 100 of present embodiment can be realized and first sew up cutting operation again tissue, moulding organizationally of suturing nail when cutting operation, the tractive force producing when cutter 54 cut can not have influence on the moulding of suturing nail, and organize to be sewn to follow closely and fix, being not easy cut cutter 54 draws and damages, cutter 54 are under the auxiliary fixation of suturing nail, can fitly cut off tissue, therefore, present embodiment is better to the sewing effect of tissue, and the otch of tissue is neat without tearing.

In the present embodiment, when described stapler 100 is during in original state, described force surface 531 and/or described stress surface 5211 do not contact with described shell fragment 55, certainly, in other modes, described force surface 531 and/or described stress surface 5211 also can contact with described shell fragment 55 under original state; When described stapler 100 is in the time sewing up state, described force surface 531 contacts described shell fragment 55 with described stress surface 5211, but deformation does not occur described shell fragment 55; When described stapler 100 is during in cut state, described force surface 531 and described stress surface 5211 push described shell fragment 55 and are out of shape.

In the present embodiment, described shell fragment 55 can be rectangular corrugated stage clip, described shell fragment 55 has pretightning force F, described pretightning force F is the minimum force that deformation occurs described shell fragment 55, when described stapler 100 is in the time sewing up state, the first thrust F1 that described ejector pin bar 73 puts on described knife rest 53 is less than described pretightning force F, avoids shell fragment 55 under stitching state that deformation occurs; When described stapler 100 is during in cut state, the second thrust F2 that described ejector pin bar 73 puts on described knife rest 53 is more than or equal to described pretightning force F, to make shell fragment 55 that deformation can occur smoothly. In addition, forming force F ' when described suturing nail has moulding, described the first thrust F1 need to be more than or equal to described forming force F ', be that pretightning force F is greater than forming force F ', so, can ensure in the situation that shell fragment 55 deformation does not occur, suturing nail can be under the effect of the first thrust F1 smooth moulding with suture tissue.

In the present embodiment, the waveform of described shell fragment 55 comprises crest and/or trough, described crest and/or described trough are faced described stress surface 5221 and described force surface 531 arranges, here, crest is defined as on shell fragment 55 towards the outstanding region of stapler 100 far-ends, and trough is defined as the region towards stapler 100 near-ends depressions.

Concrete, described stapler 100 comprises the described shell fragment 55 of two of stacking setting, two described shell fragments 55 comprise the first shell fragment 55a and the second shell fragment 55b, described the first shell fragment 55a comprises a primary peak 551a and two the first trough 552a, described the second shell fragment 55b comprises two secondary peak 551b and a second trough 552b, primary peak 551a and the second trough 552b are in contact with one another, two the first trough 552a and two corresponding settings of secondary peak 551b, and two the first trough 552a are towards described force surface 531, two secondary peak 551b are towards described stress surface 5221. here, the first shell fragment 55a and the second shell fragment 55b alignment is stacking, and under the stitching state of stapler 100, the longitudinal section of the first shell fragment 55a and the second shell fragment 55b is " 8 " font, and the required spatial accommodation of shell fragment 55 is less, in addition, in the sewing process of stapler 100, only there are two end regions of shell fragment 55 to contact gradually with force surface 531 and stress surface 5221, the zone line of shell fragment 55 does not contact with force surface 531 and stress surface 5221, on the one hand, can ensure that shell fragment 55 is convenient to occur elastic deformation, on the other hand, guarantee that shell fragment 55 is to the even application of force of nail pushing structure 52, thereby nail pushing structure 52 can be moved towards the far-end of stapler as the crow flies. certainly, in other embodiments, the quantity of shell fragment 55 can not be two, and the shape of shell fragment 55 can be not described above, and for example, the longitudinal section of the first shell fragment and the combination of the second shell fragment is " 0 " font.

Here, it should be noted that, under the stitching state of described stapler 100, the first end 553a of the first shell fragment 55a and the second end 554a lay respectively at the inner side of corresponding knife rest 53 first ends 532 and the second end 533, under stitching state, the length of the first shell fragment 55a is less than the length of knife rest 53, makes the two ends of the first shell fragment 55a have certain deformation space. In the time that the first shell fragment 55a is squeezed generation deformation, the first end 553a of the first shell fragment 55a and the second end 554a extend towards knife rest 53 first ends 532 and the second end 533 respectively, preferably, in the time that the first shell fragment 55a reaches maximum compressibility, the first end 553a of the first shell fragment 55a and the second end 554a are no more than first end 532 and the second end 533 of corresponding knife rest 53, avoid the first shell fragment 55a in recovery process, be subject to around the obstruction of miscellaneous part, or avoid the first shell fragment 55a in deformation process to around miscellaneous part exert an influence. Similar the first shell fragment 55a of the structure of the second shell fragment 55b and deformation process, does not repeat them here.

In the present embodiment, the near-end of described cutter 54 has two protuberances 542 of mutually separating, on described ejector pin pedestal 521, be formed with two grooves 5212, two the first trough 552a places are formed with first and run through groove 555a, two secondary peak 551b places are formed with second and run through groove 555b, and described protuberance 542 runs through groove 555b and first through groove 5212, second successively and runs through groove 555a and be fixed on described knife rest 53. In the utility model one embodiment, as shown in Figures 3 and 4, the near-end of protuberance 542 is formed with coupler construction 5421, on knife rest 53, form the cell body 534 of fixing described protuberance 542 and the structure matching with this coupler construction 5421, so, protuberance 542 can interfix through described cell body 534 and by coupler construction 5421 and knife rest 53.

Here, it should be noted that, on the thickness direction of described protuberance 542, described groove 5212, described first runs through the width that groove 555a and described the second width that runs through groove 555b are greater than described cell body 534, so, the protuberance 542 of cutter 54 can pass described groove 5212, described first smoothly to be run through groove 555a and described second and runs through groove 555b, and when deformation occurs shell fragment 55, can facilitate the protuberance 542 of cutter 54 to run through relative to described first that groove 555a, described second runs through groove 555b and described groove 5212 moves. In addition, as shown in Fig. 5 a-Fig. 5 c, for cutter 54 are assembled into the schematic diagram of knife rest 53, protuberance 542 places of cutter 54 are extended with coupler construction 5421 and are positioned at the supporting structure 5422 of described coupler construction 5,421 one sides, here, supporting structure 5422 is triangular shape; Coupler construction 5421 comprises snap fit body 5421a and protrudes out the hook part 5421b of snap fit body 5421a along second direction Y, between hook part 5421b and protuberance 542, is formed with gap 54211b; Described cell body 534 comprises towards the first opening 5341 of described shell fragment 55, away from the second opening 5342 of described shell fragment 55 and the stage portion 5343 between described the first opening 5341 and described the second opening 5342.

Concrete, as shown in Figure 5 a, coupler construction 5421 enters cell body 534 by the first opening 5341, and described coupler construction 5421 moves along first direction X, until supporting structure 5422 supports the force surface 531 of knife rest 53, now, as shown in Figure 5 b, because the hardness of supporting structure 5422 is greater than the hardness of knife rest 53 force surfaces 531, for example supporting structure 5422 is rigid material, and force surface 531 is plastics, in the time that described coupler construction 5421 moves to extreme position along first direction X, described supporting structure 5422 impels described plastics 531 that deformation occurs, and supporting structure 5422 itself does not change, meanwhile, described hook part 5421b arrives described stage portion 5343 places, in the lump referring to Fig. 5 c, described coupler construction 5421 continues mobile along second direction Y, described gap 54211b is coated stage portion 5343 and part force surface 531 gradually, described supporting structure 5422 is along second direction Y extruding force surface 531 until described supporting structure 5422 enters cell body 534, in the time that described coupler construction 5421 moves to extreme position along second direction Y, described gap 54211b is coated stage portion 5343 and part force surface 531 closely, described hook part 5421b is along the madial wall of the distal-most end end contact cell body 534 of second direction Y, the madial wall of cell body 534 described in described supporting structure 5422 butts simultaneously, so, hook part 5421b, the engagement limits of gap 54211b and supporting structure 5422 and cell body 534 cutter 54 phase cutter setting frames 53 along first direction X and oppositely, the motion of second direction Y and direction thereof, cutter 54 are coordinated with knife rest 53 is stable, improve the stability of cutter 54 traveling process. it should be noted that, first direction X is that the far-end of stapler is towards the direction of near-end, second direction Y is perpendicular to first direction X, on second direction Y, the length of the first opening 5341 equals or is slightly larger than the maximum length of protuberance 542, make protuberance 542 to enter cell body 534 by the first opening 5341 smoothly, hook part 5421b is substantially equal to the length of the second opening 5342 along second direction Y along end face and the supporting structure 5422 of second direction Y distal-most end along the spacing between the end face of second direction Y opposite direction distal-most end, make final hook part 5421b and supporting structure 5422 can support respectively two madial walls that cell body 534 is relative, in addition, stage portion 5343 can have an inclined plane 53431, hook part 5421b is also inclined-plane 54212b near the one side of gap 54211b, inclined plane 53431 cooperatively interacts with inclined-plane 54212b, convenient card hook part 5421b is relative, and stage portion 5343 is slided.

Below, simply introduce the variation schematic diagram of the utility model one embodiment shell fragment 55, as shown in Fig. 6 a and Fig. 6 b, when described stapler 100 is in the time sewing up state, the force surface 531 of described knife rest 53 and the stress surface 5211 of ejector pin mechanism 52 contact respectively described the first trough 552a and described secondary peak 551b gradually, now, there is not deformation in shell fragment 55, and the ultimate range between described the first trough 552a and described secondary peak 551b is the first space D 1; As shown in Fig. 7 a and Fig. 7 b, when described stapler 100 is during in cut state, shell fragment 55 is subject to the extruding of the force surface 531 of described knife rest 53 and the stress surface 5211 of ejector pin mechanism 52 and produces elastic deformation, described the first trough 552a and described secondary peak 551b are close gradually, ultimate range between described the first trough 552a and described secondary peak 551b shortens to the second space D 2, here, become example with shell fragment 55 full forms, the second space D 2 is zero, but not as limit, in other embodiments, the second space D 2 can be non-vanishing. In the present embodiment, variable quantity between described the first space D 1 and described the second space D 2 is the decrement of shell fragment 55, also be the distance that cutter 54 move relative to described ejector pin mechanism 52, so, can control by setting the first space D 1 and the second space D 2 displacement of the relatively described ejector pin of cutter 54 mechanism 52; For example, the second space D 2 is set to zero, now as long as the first space D 1 is set to equal the displacement of the relatively described ejector pin of cutter 54 mechanism 52.

As shown in Fig. 8 to Figure 10, described nail bin 51 also comprises the cutter groove 513 that is positioned at described staple containing groove 512 middle parts, described cutter groove 513 inner surfaces are formed with some outstanding structures 515, in the time that cutter described in described ejector pin mechanism urges 54 pass described cutter groove 513, described cutter 54 contacts relatively described outstanding structure 515 are towards the distal movement of described stapler 100.

Here, cutter 54 only contact with the outstanding structure 515 in cutter groove 513, situation about contacting with whole cutter groove 513 inner surfaces compared to cutter 54, present embodiment cutter 54 are less with the contact area of outstanding structure 515, frictional force between cutter 54 and outstanding structure 515 is less, effectively reduce cutter groove 513 to cutter 54 obstruction towards stapler 100 distal movement, cutter 54 can be advanced smoothly in cutter groove 513 is interior. In addition, in order to ensure the uniformity of 54 liang of side-friction forces of cutter, on the first side wall 513a that described cutter groove 513 is relative and the second sidewall 513b, be all formed with described outstanding structure 515, and described outstanding structure 515 on described the first side wall 513a and described the second sidewall 513b is oppositely arranged.

In the present embodiment, in described cutter groove 513, be also formed with the some sunk structures 514 that connect some described outstanding structures 515, described outstanding structure 515 and described sunk structure 514 are combined to form square wave-shaped configuration, here, the design of square wave-shaped configuration, can be in reducing cutter 54 and cutter groove 513 inner surface frictional force, ensure the stability of cutter 54 towards stapler 100 distal movement processes. Certainly, in other embodiments, described outstanding structure 515 and described sunk structure 514 forms such as also formation capable of being combined is sinusoidal wave.

In the present embodiment, described cutter groove 513 also comprises cutter groove body (comprising the first cutter groove body 5131a and the second cutter groove body 5131b), here taking the first cutter groove body 5131a of being positioned at cutter groove 513 the first side wall 513a places as example, the first cutter groove body 5131a is two end regions of the first side wall 513, and described outstanding structure 515 and described sunk structure 514 are positioned at the zone line of the described cutter groove body 5131a at described cutter groove 513 two ends, the width of outstanding structure 515 is less than the width of cutter groove body 5131a. In addition, the surface of described outstanding structure 515 is positioned at described cutter groove body 5131a planar, the surface of described sunk structure 514 is lower than described cutter groove body 5131a place plane, in other words, present embodiment essence is on the first side wall 513a, to be arranged with to form some sunk structures 514, the zone line of adjacent sunk structure 514 has just formed outstanding structure 515 comparatively speaking, and therefore, described outstanding structure 515 essence are the first side wall 513 regions of not caving in. Similar above-mentioned the first cutter groove body 5131a of description of the second cutter groove body 5131b, does not repeat them here.

Here, suppose that the spacing between the first relative cutter groove body 5131a and the second cutter groove body 5131b is the first gap d 1, spacing between outstanding structure 515 on relative the first side wall 513a and the second sidewall 513b is the second gap d 2, spacing between sunk structure 514 on relative the first side wall 513a and the second sidewall 513b is third space d3, third space d3 > second gap d 2=the first gap d 1. therefore, in the time that cutter 54 pass cutter groove 513, taking the first cutter groove body 5131a as example, the outstanding structure 515 of cutter 54 contact simultaneously and the first cutter groove body 5131a, because the width of outstanding structure 515 is less than the width of the first cutter groove body 5131a, the contact area of outstanding structure 515 and cutter 54 is less than the contact area of the first cutter groove body 5131a and cutter 54, in the time that the relatively described outstanding structure 515 of described cutter 54 and described the first cutter groove body 5131a produce respectively the first frictional force f1 and the second frictional force f2, described the first frictional force f1 must be less than described the second frictional force f2, thereby described outstanding structure 515 can reduce the frictional force between cutter 54 and cutter groove 513. certainly, in other embodiments, cutter 54 can design narrower, so, cutter 54 only corresponding outstanding structure 515 regions do not pass the first cutter groove body 5131a region by described cutter groove 513, so, on the one hand can further reduce the frictional force between cutter 54 and cutter groove 513, can avoid on the other hand too much outstanding structure 515 is set and affect the intensity of cutter groove 513 own.

In the present embodiment, the bearing of trend of described outstanding structure 515 is parallel to the direction of described stapler 100 near-ends towards far-end, and outstanding structure 515 extends to described nail bin face 511 places, just can see described outstanding structure 515 at described nail bin face 511 places, can ensure that outstanding structure 515 protrudes out nail bin face 511 to the blade face 541 that effect can be retained to cutter 54 that reduces of frictional force between cutter 54 and cutter groove 513, now cutter 54 can complete the dissection to tissue.

In order further to reduce the frictional force of cutter 54 in stapler 100 distal movement processes, groove 5212 inner surfaces of described ejector pin pedestal 521 are formed with some fins (not indicating), when described stapler 100 is during in cut state, the relatively described ejector pin of described cutter 54 mechanism 52 distal movement towards described stapler 100, the now described protuberance 542 of described cutter 54 contact relatively described fin and towards the distal movement of described stapler 100, the design of fin can effectively reduce the frictional force between cutter 54 and groove 5212 inner surfaces.

Stitching and cutting process that stapler 100 is described in detail in detail below, in conjunction with the explanation of above-mentioned stapler 100, specifically comprise:

When described stapler 100 is during in original state, in the lump with reference to figure 11a and Figure 11 b, between nail bin groupware 50 and nail-anvil assembly 60, there is a segment distance, described force surface 531 and/or described stress surface 5211 do not contact with described shell fragment 55; Then nail bin push rod 72 promotes nail bin groupware 50 and moves towards nail-anvil assembly 60, until nail bin groupware 60 and nail-anvil assembly 60 grip tissue, as shown in Figure 12 a and Figure 12 b;

When described stapler 100 is in the time sewing up state, ejector pin bar 73 forces on knife rest 53 under the percussion effect of percussion assembly, the the first thrust F1 that puts on described knife rest 53 due to ejector pin bar 73 is now less than the pretightning force F of described shell fragment 55, there is not deformation in shell fragment 55, and the first thrust F1 is passed to 52 places of ejector pin mechanism by shell fragment 55, so, under the effect of ejector pin bar 73, knife rest 53, shell fragment 55, ejector pin mechanism 52, cutter 54 are relatively static and move towards nail-anvil assembly 60 together, until ejector pin mechanism 52 releases the suturing nail in staple containing groove 512, the power that ejector pin mechanism 52 puts on described suturing nail is the first thrust F1, because the first thrust F1 is greater than the forming force F ' of suturing nail, ejector pin mechanism 52 can assist suturing nail in the moulding of tissue place, simultaneously, after suturing nail moulding, ejector pin mechanism 52 rests on original place, ejector pin mechanism 52 is subject to the barrier effect of nail-anvil assembly 60 and cannot continues to move towards the far-end of stapler 100, in addition, the blade face 541 of cutter 54 is lower than the flank of tooth 523 of ejector pin mechanism 52, concrete, now the blade face 541 of cutter 54 is lower than described nail bin face 511. certainly, inevitably, the first thrust F1 is meeting loss to some extent in transmittance process, and what the first thrust F1 was arranged is slightly larger, can ensure the smoothly auxiliary suturing nail moulding of ejector pin mechanism 52.

When described stapler 100 is during in cut state, in the lump with reference to figure 13a and Figure 13 b, ejector pin bar 73 continues to force on knife rest 53, the the second thrust F2 that puts on described knife rest 53 due to ejector pin bar 73 is now greater than the pretightning force F of described shell fragment 55, and shell fragment 55 is stopped by ejector pin mechanism 52 away from one end of knife rest 53, there is deformation in shell fragment 55 now, knife rest 53 drives the relatively described ejector pin of described cutter 54 mechanism 52 to continue to move towards nail-anvil assembly 60, until cutter 54 have cut tissue, now, cutter anvil 62 on the blade face 541 contact stud anvil assemblies 60 of cutter 54, concrete, outstanding structure 515 in cutter 54 contacts relatively described cutter groove 513 is cut off tissue towards the 62 direction motions of cutter anvil.

Sew up after cutting operation when described stapler 100 completes, ejector pin bar 73 is towards the near-end motion of stapler 100, and shell fragment 55 restores to the original state, and the blade face 541 of cutter 54 is also reset to the flank of tooth 523 lower than ejector pin mechanism 52.

The utility model by arranging the shell fragment 55 with certain pretightning force between ejector pin mechanism 52 and knife rest 53, realize stapler 100 to organizing the first stitching operation of cutting again by controlling the thrust of ejector pin bar 73, simple in structure, sewing effect to tissue is better, and the otch of tissue is neat without tearing. In addition, in cutter groove 513 of the present utility model, be formed with some outstanding structures 515, can reduce the frictional force being subject to when cutter 54 are advanced in cutter groove 513.

Be to be understood that, although this description is described according to embodiment, but be not that each embodiment only comprises an independently technical scheme, this narrating mode of description is only for clarity sake, those skilled in the art should make description as a whole, technical scheme in each embodiment also can, through appropriately combined, form other embodiments that it will be appreciated by those skilled in the art that.

Listed a series of detailed description is above only illustrating for feasibility embodiment of the present utility model; they are not in order to limit protection domain of the present utility model, all do not depart from the equivalent embodiment that the utility model skill spirit does or change and all should be included in protection domain of the present utility model within.

Claims (10)

1. a stapler, comprise ejector pin bar, cutter, ejector pin mechanism and nail bin, described ejector pin bar is used for promoting described cutter and described ejector pin mechanism kinematic, described ejector pin mechanism is used for promoting suturing nail, it is characterized in that, described nail bin comprises the staple containing groove for holding described suturing nail and is positioned at the cutter groove at described staple containing groove middle part, described cutter groove inner surface is formed with some outstanding structures, in the time that cutter described in described ejector pin mechanism urges pass described cutter groove, described cutter contact relatively described outstanding structure are towards the distal movement of described stapler.

2. stapler according to claim 1, is characterized in that, described cutter groove inner surface is also formed with the some sunk structures that connect some described outstanding structures, and described outstanding structure and described sunk structure are combined to form square wave-shaped configuration.

3. stapler according to claim 2, it is characterized in that, described cutter groove also comprises cutter groove body, and the surface of described outstanding structure is positioned at corresponding described cutter groove body institute planar, and the surface of described sunk structure is lower than described cutter groove body place plane.

4. stapler according to claim 3, it is characterized in that, in the time that cutter described in described ejector pin mechanism urges pass described cutter groove, the relatively described outstanding structure of described cutter and described cutter groove body produce respectively the first frictional force and the second frictional force, and described the first frictional force is less than described the second frictional force.

5. stapler according to claim 3, is characterized in that, described cutter groove body is positioned at the two ends of described cutter groove, and described outstanding structure and described sunk structure are between the described cutter groove body at described cutter groove two ends.

6. stapler according to claim 1, is characterized in that, described nail bin comprises the nail bin face that is positioned at its far-end, and described outstanding structure extends to described nail bin face.

7. stapler according to claim 1, is characterized in that, the bearing of trend of described outstanding structure is parallel to the direction of described stapler near-end towards far-end.

8. stapler according to claim 1, is characterized in that, described cutter groove comprises the first side wall and the second sidewall that lay respectively at described cutter both sides, on described the first side wall and described the second sidewall, is all formed with described outstanding structure.

9. stapler according to claim 8, is characterized in that, the described outstanding structure on described the first side wall and described the second sidewall is oppositely arranged.

10. stapler according to claim 1, it is characterized in that, the near-end of described cutter is formed with at least one protuberance, described ejector pin mechanism comprises ejector pin pedestal, on described ejector pin pedestal, be formed with at least one groove of corresponding described protuberance, described groove inner surface is formed with some fins, when described stapler is during in cut state, the relatively described ejector pin of described cutter mechanism is towards the distal movement of described stapler, and described protuberance contact the relatively described fin of described cutter move.