CN104323831B - Total spondylectomy intercalated disc cutter - Google Patents

Abstract

The invention discloses a total spondylectomy intercalated disc cutter, and relates to a surgical instrument for use in posterior spinal total spondylectomy. The total spondylectomy intercalated disc cutter is characterized in that a holding handle is arranged on the lower part behind a strip-shaped bracket; a blocking hook which is bent upwards is arranged at the front end of the bracket; a knife is arranged on the bracket; a tool bit at the front end of the knife can move forward and backward on the bracket, and the cutting edge of the tool bit corresponds to the blocking hook; when the blocking hook is pressed against one side of an intervertebral disc from the front side, the tool bit of the knife can be used for finishing cutting of the same side of the intervertebral disc forwards; when the blocking hook is pressed against the other opposite side of the intervertebral disc from the front side, the tool bit of the knife can be used for finishing cutting of the other opposite side on the same cutting plane of the intervertebral disc forwards, thereby finishing cutting of the whole intervertebral disc. By adopting the total spondylectomy intercalated disc cutter, possible surgical risk caused by the conventional instrument can be avoided, and the surgery time is shortened.

Description

Total spondylectomy intercalated disc sickle

Technical field

The present invention relates to a kind of bone surgery set, more particularly to a kind of operation for Via Posterior Spinal Approach Total spondylectomy Apparatus.

Background technology

Primary spinal tumors, can be in single-shot or continuouss, and focus involves vertebral body, adnexa, or even surrounding soft tissue, companion Or no at a distance and elsewhere organ metastasis.For improving life cycle and improving symptom, operation is often one of optimum selection.But because For there being big blood vessel in front of spinal column, there are spinal cord, the damage at any position in vertebral body rear, is all likely to occur serious consequence.Vertebra focus Excision, needs to excise outside complete tumor capsule, reaches complete under naked eyes excision.So bring huge challenge to spinal surgeons, One of Operative Puzzle is that row Total spondylectomy intercalated disc cuts, and needs multiple apparatuses auxiliary during operation, and action need soft, Precisely, just can prevent during operation to blood vessel or spinal cord injury.

Tradition, through the operation of way of escape Total spondylectomy, when cutting intervertebral disc, in front of vertebral body after soft tissue release, is pressed with long Intestinal plate passes through and connects, isolation front tissue.Simultaneously need to decompression vertebral body organization in the rear, protect spinal cord with cord dorsal potentials device, finally Slowly cut intervertebral disc using scroll saw.Above operation presence can cause operating time to extend, and amount of bleeding increases lacking of equivalent risk Point.

First, when row vertebral body forward and backward side decompression is loosened, bleeding is increased to damaging surrounding tissue, operates slow therefore in art, Extend operating time, also increase infection risk simultaneously；

Secondly, still suffer to blood vessel injury and spinal cord injury risk using traditional instruments, may be not in place because protecting in art, During operation, strength is uneven etc., accidentally injures blood vessel and spinal cord, leads to serious consequence.

Content of the invention

The present invention is intended to provide a kind of operation risk avoiding traditional instruments may bring, and shorten operating time Total spondylectomy intercalated disc sickle.

The technical scheme is that Total spondylectomy intercalated disc sickle, the support rear lower of strip installs lever, The front end of frame sets the stop hook being bent upwards；One cutter is installed on support, the cutter head of this cutter front end can move on this support in front and back Move and the cutting edge of this cutter head is corresponding with this stop hook, when this stop hook props up the side of intervertebral disc from front side, the cutter head of this cutter The cutting of this this side of intervertebral disc can be completed forward, and when this stop hook props up another opposite side of this intervertebral disc from front side, this knife The cutter head of tool can complete forward the cutting of another opposite side of the same cutting planes of this intervertebral disc, thus completing cutting of whole intervertebral disc Cut.

The present invention arranges the stop hook of arc in the front end of support, and this stop hook can comply with vertebral body Front Frame, and docile fixation In front of vertebral body.The cutter head that can be moved forward and backward in the setting of the intervertebral disc rear of vertebral body by support, at twice in same intervertebral disc Same cutting planes on using cutter head movement, this intervertebral disc is intactly cut open.It has started a kind of brand-new and simple Lumbar diskectomy modus operandi, so the operation risk that traditional instruments may be brought can be avoided, and shorten operating time.

Implement in structure preferred: described cutter also comprises knife rest, knife bar and knob, and the rear end of described support is upwards Extend a nut；The cutter head of described cutter is fixed on the front portion of this knife rest, and the rear portion of this knife rest can rotate against but can not The front portion of this knife bar isolatedly connected, the bottom of this knife rest can slide anteroposterior but inseparably connect described support；This knife bar Rear portion set screw thread and screw togather with this nut；The rearward end of this knife bar is fixedly connected with this knob.

Cutter adopts this version, only needs slow turning knob so that it may so that knife bar promotes knife rest and cutter head propping up Movable on frame, easy to operate and cutter head is mobile steadily.The version of this cutter is easily achieved, and is easy to sterilize, repeatedly Use.

In the enforcement structure recommended: the first half of described knife rest is the principal part of tabular, this principal part has and runs through thereon The grooving of end face, front end face and lower surface；Described cutter head is inserted and secured in the grooving of knife rest principal part.

The structure of this knife rest utilizes the grafting relation of grooving and cutter head, can using known mode connects for screw, pin even The various technological means such as connect and firmly fix cutter head, be also convenient for changing cutter head.

In the enforcement structure recommended: the lower end of left and right two sides of described knife rest principal part is respectively equipped with outwardly convex Longitudinally lower sliver, and the top compartment of terrain of sliver in each of the lower is correspondingly arranged upper sliver parallel with it；This principal part arranged on left and right sides Lower sliver and the upper sliver of homonymy between formed guide groove；The middle part of described support be provided with one run through thereon, the length of lower surface Circular hole, the size of this slotted hole be enough to stretch into wherein with allowing the principal part horizontal of described knife rest；On the lower surface of described support, edge Longitudinal axis and have forward elongated slot wide and concave up with this slotted hole together from the front end of this slotted hole, in described support Upper surface have forward narrower than this slotted hole one and downward through long to this along longitudinal axis from the front end of this slotted hole The groove of groove, the arranged on left and right sides of this groove forms inwardly protruded strip gib block respectively, and this two gib blocks are clipped in respectively In the guide groove of described knife rest principal part bottom arranged on left and right sides.

The gliding movement targeting structure of this knife rest and support assorted, wants meeting the function that knife rest can move forward and backward on support While asking, also effectively limit knife rest and do not depart from support up or down.Correct select on support two gib blocks with Gap between the lower sliver of knife rest principal part bottom arranged on left and right sides and the upper sliver of homonymy it can also be ensured that cutter head move forward and backward Stationarity, that is, cutter head cuts the stationarity of intervertebral disc, makes gentle cutting operation to being accurately controlled.

In the enforcement structure recommended: on the stop hook of described support, corresponding described groove has the knife that allows of one insertion Groove, this allows the maximum height of cutter groove be less than the top of described stop hook；Described cutter edge be inserted in the groove of described support or Described stop hook allow in cutter groove.

On stop hook, setting allows cutter groove, the bottom of cutter edge can be made to be inserted in support in the stage starting to cut intervertebral disc Groove in, formed intervertebral disc outside " back chipping " dissection；Before the end of a period stage of cutting intervertebral disc makes the cutting edge of cutter head Portion is inserted in the allowing in cutter groove of stop hook, and the dissection forming " back chipping " on front side of intervertebral disc, it is ensured that not staying dead angle, is thoroughly cut Cut.Further, since knob is combined with the nut on support, at the rear of cutter, the effective length of cutter can be restricted, Prevention cutter head easily sliding exceed front stop hook allow cutter groove, lead to the other tissue of injured patient.

Implement in structure preferred: described knife rest latter half of for cylindrical connecting portion；This connecting portion leading portion upper Portion is provided with a horizontal pin-and-hole, the jack having inside this connecting portion along longitudinal axis, and this jack is from the rear end of this connecting portion Extend to its leading section, surmount this pin-and-hole and pass through with this pin-and-hole phase；Described knife bar leading section sets the less Plug Division of diameter, The pin-and-hole of the corresponding described knife rest connecting portion in the front portion of this Plug Division has one annular groove；The Plug Division of described knife bar front end is inserted in institute State in the jack of knife rest connecting portion；One long pin passes through the pin-and-hole of described knife rest connecting portion and the ring of described knife bar Plug Division Groove, makes the rear portion of described knife rest can rotate against but inseparably connects the front portion of described knife bar.

This knife rest and the attachment structure of knife bar, the resistance that knife bar rotates is little, and knife bar is high with the bonding strength of knife rest, also easy In processing and fabricating and assembling.

Implement in structure preferred: the main body of rectangular sheet is provided with described cutter head, this body front part sets cutting part, The top of this cutting part surmounts the upper surface of this main body and swells upwards, forms the knife back of arcs of recesses.

The knife back is in arcs of recesses, can avoid spinal cord, be unlikely to lead to spinal cord injury during cutting.

Particularly: left and right two opposed facets of first half of the front side of described cutter head cutting part to the curved edge of lower end On all radially open up numerous oblique grooves, these oblique grooves make the knife edge indentation of this cutting edge；The latter half of one-tenth of this cutting edge Straight wedgelike continues up to the bottom in described main body stage casing.

The zigzag knife edge of this cutter head curved edge is especially sharp, and cutting power when translation is advanced is strong, cutting effect Good.

Total spondylectomy intercalated disc sickle having the beneficial effect that in operation of the present invention:

1st, stripping that need not be undue to spinal column surrounding soft tissue, significantly reduce the operation such as many spinal concussion；Without to spinal column Front soft tissue too loosen, slowly curved metal stop hook in front of support is positioned in front of spinal column, can be to intervertebral disc in front of Tissue plays knife headlong over range displacement when protecting and limit its cutting；

2nd, without vertebral body rear spinal cord is done with extra adequately protecting, cut the concave arc of the knife back of intervertebral disc, will not Spinal cord is caused extrude equivalent damage；

Power when the 3rd, cutting relies on slow rotary knob, makes cutter head extrude disc tissue, and the sword of its cutter head Mouth is sharp, can smoothly complete intervertebral disc and surrounding ligaments fracture..

Total spondylectomy intercalated disc sickle of the present invention, in art cutting intervertebral disc divide about two steps operation, can be promptly complete Ligament and disc tissue in front of excision vertebral body, and the ligament tissue at vertebral body rear can be excised.When effectively can shorten operation Between and reduce infection, reduce clinical complication.We are by substantial amounts of animal and the experiment of human cadaver's spinal column specimen, the present invention Total spondylectomy intercalated disc sickle smoothly can excise intervertebral disc, and blood vessel and rear spinal cord in front of not damaged, the operating time is short, Safe and reliable.

Brief description

Fig. 1 is the deployed configuration schematic diagram of Total spondylectomy one embodiment of intercalated disc sickle of the present invention.

Fig. 2 is the perspective view of cutter head in Fig. 1 embodiment.

Fig. 3 is the perspective view of Fig. 1 embodiment intermediate slide.

Fig. 4 is the longitudinal profile structure schematic of Fig. 1 embodiment medium-height trestle.

Fig. 5 is the perspective view of Fig. 1 embodiment.

Fig. 6 is cutter head in Fig. 1 embodiment, the longitudinal profile structure schematic of the cutter of knife rest, knife bar and knob composition.

Fig. 7 is cutter head, knife rest, the perspective cut-away structural representation of support mutual relation in Fig. 1 embodiment.

Fig. 8 is to cut one of test photo of pig spinal bone using Fig. 1 embodiment.

Fig. 9 is the two of the test photo cutting pig spinal bone using Fig. 1 embodiment.

Figure 10 is the three of the test photo cutting pig spinal bone using Fig. 1 embodiment.

Figure 11 is the four of the test photo cutting pig spinal bone using Fig. 1 embodiment.

Figure 12 is the five of the test photo cutting pig spinal bone using Fig. 1 embodiment.

Figure 13 is the six of the test photo cutting pig spinal bone using Fig. 1 embodiment.

Specific embodiment

The deployed configuration of Total spondylectomy one embodiment of intercalated disc sickle of the present invention, as shown in figure 1, it has cutter head 1, knife The parts such as frame 2, knife bar 3, support 4, lever 5 and knob 6.

The structure of cutter head 1, main body 11 front portion that refer to Fig. 2: its rectangular sheet sets cutting part 12.Cutting part 12 upper Portion surmounts the upper surface of main body 11 and swells upwards, forms the knife back of arcs of recesses.The front side of cutting part 12 is inwardly to receive to lower end The curved edge 13 of contracting, left and right two opposed facets of first half of cutting part 12 cutting edge 13 all radially opens up numerous oblique Groove 131, these oblique grooves 131 make the knife edge 132 indentation of cutting edge 13.The wedgelike that the latter half of one-tenth of this cutting edge 13 is straight Continue up to the bottom in main body 11 stage casing.The back segment of main body 11 is provided with upper and lower two vias 14.

The structure of knife rest 2, refer to Fig. 3: knife rest 2 first half be tabular principal part 21, latter half of for cylindrical company Socket part 27.The grooving 22 running through its upper surface, front end face and lower surface is had on principal part 21；The front portion of principal part 21 is provided with upper and lower Two installing holes 23 running through grooving 22；And it is configured with a short pin 231 for each installing hole 23.This two installing holes 23 Size and spacing are consistent with two vias 14 in cutter head 1 main body 11.The lower end of left and right two sides of principal part 21 is respectively equipped with Sliver 24 under the longitudinal direction of outwardly convex, and the top compartment of terrain of sliver 24 in each of the lower is correspondingly arranged upper sliver parallel with it 25.Form guide groove 26 between the lower sliver 24 of principal part 21 arranged on left and right sides and the upper sliver 25 of homonymy.The top of connecting portion 27 leading portion It is provided with a horizontal pin-and-hole 271, and be equipped with a long pin 272 for it.Have along longitudinal axis inside connecting portion 27 Jack 273 (refer to Fig. 6), this jack 273 extends to its leading section from the rear end of connecting portion 27, surmounts pin-and-hole 271 simultaneously Mutually pass through with pin-and-hole 271.

The structure of knife bar 3, as shown in figures 1 to 6.The knife bar 3 of cylindrical posts shape, it is less slotting that leading section is provided with diameter The jack 273 of socket part 31, the diameter of Plug Division 31 and length and knife rest 2 connecting portion 27 is to corresponding；The front portion of this Plug Division 31 is right The pin-and-hole 271 answering knife rest 2 connecting portion 27 has one annular groove 311.The rear portion of knife bar 3 is provided with one section of trapezoidal thread 32, on knife bar 3 It is provided with outward flange 33 at the rear of trapezoidal thread 32 and the rearward end in outward flange 33 rear side opens up radial direction via 34.

As shown in Figure 1 and Figure 4, its main body 40 is elongated flat steel bar to support 4.The rear end of main body 40 extends upward one Individual nut 41.The axis of this nut 41 and the trapezoidal thread 32 of main body 40 longitudinal axis parallel and its female thread 411 and knife bar 3 Corresponding.The front end of main body 40 is provided with the stop hook 42 being bent upwards.The middle part of main body 40 be provided with one run through thereon, lower surface Slotted hole 401.The size of this slotted hole 401 be enough to stretch into wherein with allowing principal part 21 horizontal of knife rest 2.Following table in main body 40 Face, along main body 40 longitudinal axis from the front end of slotted hole 401 forward until the front end of main body 40 have together with oval The wide and concave up elongated slot in hole 401 402.Main body 40 upper surface along main body 40 longitudinal axis from slotted hole 401 Front end forward until the front end of main body 40 have together narrower than slotted hole 401 many and downward through the groove to elongated slot 402 404, the arranged on left and right sides of groove 404 forms the left and right side wall inwardly protruded strip gib block 403 from elongated slot 402 respectively, Two gib blocks 403 are corresponding with the guide groove 26 of knife rest 2 principal part 21 bottom arranged on left and right sides.On stop hook 42, corresponding main body 40 is logical What groove 404 had one insertion stop hook 42 allows cutter groove 421, allows the maximum height of cutter groove 421 be slightly below the top of stop hook 42.Main The lower surface of body 40 rearward end is provided with a blind hole 408 to install lever 5.

After the present embodiment assembling, as shown in Fig. 5, Fig. 6 and Fig. 7: the main body 11 of cutter head 1 is inserted in the grooving of knife rest 2 principal part 21 In 22, upper and lower two installing holes 23 in front portion and cutter head 1 main body 11 back segment that two short pins 231 are each passed through knife rest 2 principal part 21 Upper and lower two vias 14, cutter head 1 is fixed on the principal part 21 of knife rest 2.Stretch into support 4 main body to principal part 21 horizontal of knife rest 2 After the slotted hole 401 at 40 middle parts, push away further along, two gib blocks 403 in support 4 main body 40 are respectively inserted in knife rest 2 principal part 21 In the guide groove 26 of bottom arranged on left and right sides, knife rest 2 and cutter head 1 is made can smoothly to move forward and backward in the main body 40 of support 4.Knife The anterior nut 41 passing through support 4 rear end with middle part of bar 3, the trapezoidal thread 32 at knife bar 3 rear portion is screwed in nut 41.Knife bar 3 Rearward end be inserted in the jack 61 of knob 6 front side.One steady pin 63 passes through pin-and-hole 62 and knife on knob 6 left and right side The radial direction via 34 of bar 3 rearward end, knob 6 is fixed on the rearward end of knife bar 3.

The Plug Division 31 of knife bar 3 front end is inserted in the jack 273 of knife rest 2 connecting portion 27；Long pin 272 passes through knife rest 2 even The pin-and-hole 271 of socket part 27 and the annular groove 311 of knife bar 3 Plug Division 31, make knife bar 3 can carry during rotating relative to knife rest 2 Movable knife rack 2 moves forward and backward along the groove 404 in support 4 main body 40 and can not separate.The knife edge 131 of the cutting edge 13 of cutter head 1 Bottom is hidden in the bottom allowing cutter groove 421 of the groove 404 of support 4 main body 40 or stop hook 42.The heart axle of lever 5 upper end inserts simultaneously It is fixed in the blind hole 408 of support 4 main body 40 rearward end, make lever 5 and support 4 connect into the entirety of a gun-type.

Turning knob 6, makes that knife bar 3 pushes knife rest 2 and cutter head 1 moves forward, until the outward flange 33 at knife bar 3 rear portion props up After support 4 during the rear end face of end nut 41, when knob 6 no longer can continue to make knife bar 3 promote knife rest 2 and cutter head 1 to move forward, knife What the knife edge 131 of 1 cutting edge 13 inserted support 4 stop hook 42 already allows in cutter groove 421.

During use, first turning knob 6, make that knife bar 3 pushes knife rest 2 and cutter head 1 is moved rearwards by, until cutter head 1 is away from support 4 Stop hook 42.Then to patient spine anterior-lateral decompression, softly the stop hook 42 of cutter holder 4 is positioned over before vertebral body side Side, makes stop hook 42 prop up on front side of the intervertebral disc to be cut, and the rear side just to this intervertebral disc for the cutter head 1.Afterwards, slow rotary knob 6, make that knife bar 3 pushes knife rest 2 and cutter head 1 moves forward, now the knife edge 131 of cutter head 1 cutting edge 13 slowly cuts disc tissue Cutting intervertebral disc, observes vertebral body rear spinal cord, is allowed to not suffer oppression, when the knife edge 131 of cutter head 1 cutting edge 13 inserts support 4 stop hook 42 allow in cutter groove 421 after, knob 6 cannot be rotated further and cutter head 1 does not readvance, and has now pointed out this side intervertebral disc Cutting finishes.In the same way lumbar diskectomy is implemented to the same cutting planes of opposite side of this intervertebral disc again, you can complete Excise whole intervertebral disc and surrounding ligaments tissue.

For occupation mode and the effect of the present embodiment are described, in Fig. 8 to Figure 13, we are cut with the vertebrae of one section of pig Cut the demonstration of operation.In Fig. 8, sickle cutter head 1 is away from the stop hook 42 of support 4；The stop hook 42 of support 4 is positioned over pig vertebral body first In front of side, and stop hook 42 is made to prop up on front side of the intervertebral disc to be cut, and the rear side just to this intervertebral disc for the cutter head 1.Slow rotation rotation Button 6, makes that knife bar 3 pushes knife rest 2 and cutter head 1 moves forward, and in Fig. 9, the knife edge 131 of cutter head 1 cutting edge 13 slowly cuts intervertebral disc Tissue cutting intervertebral disc, is finally completed the cutting of pig intervertebral disc first side.In Figure 10, sickle has changed a direction, and cutter head 1 is again The secondary stop hook 42 away from support 4；The stop hook 42 of support 4 is positioned in front of pig vertebral body opposite side, and stop hook 42 props up the vertebra to be cut On front side of intercalated disc and ligament tissue, and the rear side just to the same cutting planes of this intervertebral disc for the cutter head 1.Afterwards, slow rotary knob 6, Make that knife bar 3 pushes knife rest 2 and cutter head 1 moves forward.In Figure 11, the knife edge 131 of cutter head 1 cutting edge 13 slowly cuts disc tissue Cutting intervertebral disc, is finally completed the cutting of this pig intervertebral disc opposite side and ligament tissue.Figure 12 and Figure 13 shows, this pig intervertebral disc Cut completely through, the vertebra of both sides and ligament tissue are separated, and the spinal cord of rear side is retained and is without damage.

In actual use, the stop hook 42 of different model can be designed for support 4, being allowed to more can be docile with anterior margin of vertebral body, So more can insert anterior margin of vertebral body very well, and protect surrounding soft tissue, in front of it, arc groove is mated with the knife edge and combines thereafter Square length limitation, sliding exceedes front to prevention blade easily, leads to injury tissue；Cutter head 1 cutting edge 13 cutting part can periodically grinding, Keep its sharpness.Notice that the radian guaranteeing cutter head 1 front portion should be mated so as to cut with the arc of support 4 front stop hook 42 When be unlikely to produce unnecessary damage to surrounding soft tissue；The knife back arc of cutter head 1 can suitably increase, and its object is to cut When not interior shifting, spinal cord is caused with unnecessary damage.

The above, only present pre-ferred embodiments, the scope of present invention enforcement, skill under this invention are not limited with this Equivalence changes and modification that art scheme and description are made, all should belong to the scope that the present invention covers.

Claims (5)

1. Total spondylectomy cutter for intervertebral discs it is characterised in that: the support rear lower of strip installs lever, the front end of support If the stop hook being bent upwards；One cutter is installed on support, the cutter head of this cutter front end can move forward and backward and this knife on this support The cutter edge of head is corresponding with this stop hook, and when this stop hook props up the side of intervertebral disc from front side, the cutter head of this cutter can be to Before complete the cutting of this intervertebral disc another opposite side relative with this side, and when this stop hook props up the institute of this intervertebral disc from front side When stating another opposite side, the cutter head of this cutter can complete forward the cutting of the described side of the same cutting planes of this intervertebral disc, from And complete the cutting of whole intervertebral disc；

Described cutter also comprises knife rest, knife bar and knob, and the rear end of described support extends upward a nut；Described cutter Cutter head be fixed on the front portion of this knife rest, the rear portion of this knife rest can rotate against but inseparably connect the front portion of this knife bar, The bottom of this knife rest can slide anteroposterior but inseparably connect described support；The rear portion of this knife bar sets screw thread and this nut spiral shell Close；The rearward end of this knife bar is fixedly connected with this knob；

The first half of described knife rest be tabular knife rest principal part, this knife rest principal part has run through its upper surface, front end face and under The grooving of end face；Described cutter head is inserted and secured in the grooving of knife rest principal part；

The lower end of left and right two sides of described knife rest principal part is respectively equipped with sliver under the longitudinal direction of outwardly convex, and leads in each of the lower The top compartment of terrain of bar is correspondingly arranged upper sliver parallel with it；The lower sliver of this knife rest principal part arranged on left and right sides is upper with homonymy Form guide groove between sliver；The middle part of described support be provided with one run through thereon, the slotted hole of lower surface, the size of this slotted hole Be enough to stretch into wherein with allowing the knife rest principal part horizontal of described knife rest；In the lower surface of described support, along longitudinal axis from this The front end of slotted hole has forward together wide and concave up with this slotted hole elongated slot, described support upper surface along vertical Have forward narrower than this slotted hole one to axis from the front end of this slotted hole and downward through the groove to this elongated slot, this groove Arranged on left and right sides form inwardly protruded strip gib block respectively, this two gib blocks are clipped under described knife rest principal part respectively In the guide groove of portion's arranged on left and right sides.

2. Total spondylectomy cutter for intervertebral discs according to claim 1 it is characterised in that: right on the stop hook of described support Described groove is answered to have the cutter groove that allows of one insertion, this allows the maximum height of cutter groove be less than the top of described stop hook；Described Cutter edge be inserted in the groove of described support or described stop hook allow in cutter groove.

3. Total spondylectomy cutter for intervertebral discs according to claim 1 it is characterised in that: the latter half of of described knife rest is Cylindrical knife rest connecting portion；The top of this knife rest connecting portion leading portion is provided with a horizontal pin-and-hole, inside this knife rest connecting portion Have jack along longitudinal axis, this jack extends to its leading section from the rear end of this knife rest connecting portion, surmount this pin-and-hole simultaneously Pass through with this pin-and-hole phase；Described knife bar leading section sets diameter less knife bar Plug Division, and the front portion of this knife bar Plug Division is corresponding described The pin-and-hole of knife rest connecting portion has one annular groove；The knife bar Plug Division of described knife bar front end is inserted in the jack of described knife rest connecting portion In；One long pin passes through the pin-and-hole of described knife rest connecting portion and the annular groove of described knife bar Plug Division, makes the rear portion of described knife rest Can rotate against but inseparably connect the front portion of described knife bar.

4. the Total spondylectomy cutter for intervertebral discs according to claim 1 or 2 or 3 it is characterised in that: set on described cutter head There is the main body of rectangular sheet, this body front part sets cutter head cutting part, the top of this cutter head cutting part surmounts the upper end of this main body Face is simultaneously swelled upwards, forms the knife back of arcs of recesses.

5. Total spondylectomy cutter for intervertebral discs according to claim 4 it is characterised in that: before described cutter head cutting part Side all radially opens up numerous oblique grooves on left and right two opposed facets of first half of the arc cutter edge of lower end, this A little oblique grooves make the knife edge indentation of this cutter edge；The wedgelike that the latter half of one-tenth of this cutter edge is straight continues up to The bottom in described main body stage casing.