the following detailed description is merely exemplary in nature and is not intended to limit the described embodiments or the application and uses of the described embodiments . as used herein , the word “ exemplary ” or “ illustrative ” means “ serving as an example , instance , or illustration .” any implementation described herein as “ exemplary ” or “ illustrative ” is not necessarily to be construed as preferred or advantageous over other implementations . all of the implementations described below are exemplary implementations provided to enable persons skilled in the art to make or use the embodiments of the disclosure and are not intended to limit the scope of the disclosure , which is defined by the claims . for purposes of description herein , the terms “ upper ”, “ lower ”, “ left ”, “ rear ”, “ right ”, “ front ”, “ vertical ”, “ horizontal ”, and derivatives thereof shall relate to the invention as oriented in each figure . furthermore , there is no intention to be bound by any expressed or implied theory presented in the preceding technical field , background , brief summary or the following detailed description . it is also to be understood that the specific devices and processes illustrated in the attached drawings , and described in the following specification , are simply exemplary embodiments of the inventive concepts defined in the appended claims . hence , specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting , unless the claims expressly state otherwise . fig1 presents a right side elevation view of an assembled surgical rongeur with disposable and replaceable cutting blade in an embodiment herein . this drawing has a rear handle 2 disposed at an angle to and integrally formed with a shaft 4 portion that extends out forwards and to the right in the figure . the juncture 17 between the shaft and the handle 2 has a hole passing completely therethrough from the top to the bottom of the device ; it should be easily understood that the two curved portions one on either side of the hole bound the right and left side of this hole . the hole permits the entry of the top of the pivoting forward handle 8 within this hole out and above the horizontal level of the shaft ; this because the pivoting forward handle has a cutout 11 at its end that is designed to engage a pin 15 a integral with or inserted within the slide drive member 7 that is sitting atop a guide rail 18 integrally formed from the shaft . as stated above , the pin 15 a is either integral with or inserted within two corresponding holes on either side of the slide member as shown . if integral , it is formed from the inner surfaces of the slide member that has a space permitting this as a transverse device from the inner right side of the space to the inner left side therein ; otherwise , it is a separate component that is inserted in holes 15 on either side of the slide member for use as a male female screw combination for secure attachment thereto . thus , the top cutout portion of the forward handle 8 acts against this pin 15 a to move the slide drive member 7 forwards as a hammer thereby cutting tissue , bone or otherwise . to complete the pivoting motion , the forward handle 8 is also attached to the two curved portions at the juncture between the shaft and the rear handle 2 using a pin male female screw attachment 13 through holes 12 a on both of the curved portions and corresponding hole 12 on the handle 8 . finally , a user compresses the forward pivoting handle 8 on pin 13 and against the pin 15 a thereby forcing the slide member at the top of the device down a rail 11 in the shaft 7 . the improved surgical device shown herein comprises various items as described in the following . first , a curved body 1 having a hole passing from the top to bottom is integral with a rear handle 2 depending at an angle from the proximal end 3 of the body 1 , and has a shaft 4 extending outwards and terminating at its distal end in an angled plate 5 a . a support protrusion 6 extends from the upper portion of the rear handle 2 ; this helps a user maintain a proper grasp of the device as it provides support for the area of the hand between the thumb and the first finger . mounted on the shaft 4 is a slide drive member 7 for reciprocating movement on the shaft 4 . fig2 illustrates a right side elevation view of a disassembled surgical rongeur with disposable and replaceable cutting blade in an embodiment herein . the figure shows a pivoting forward handle 8 ( that is a separate part to be attached to main body 1 ) that includes a lower finger grip portion 9 and an upper finger portion 10 for a user &# 39 ; s finger control of the device . the uppermost part of the forward handle 8 is a portion having a cutout 11 and a hole 12 ( pin 13 inserted therein or integrally formed within ) below it through which passes a pivot pin 13 such as a male female screw arrangement therethrough ; the pivot pin 13 likewise passes through two corresponding holes 12 a on the two curved under portions 17 of body 1 . it should be understood that holes 12 a are located opposite each other such that the hole 12 on the forward handle 8 is located between the two corresponding holes 12 a and the two curved under portions 17 are disposed laterally thereto for insertion of a pivot pin 13 screw arrangement ; the pin 13 is typically made of two components male and female ; one a threaded hollow cylinder for insertion of the male screw , but it should be understood that other types of attachments are possible . the portion of the handle 8 having the slot 11 fits into the body 1 through an hole extending top to bottom ( not shown in the figure ) in the region of the curved portion 17 . this slot 11 grasps and engages a transverse integral member 15 formed within a space 16 ( not shown ) in the slide drive member 7 . this transverse member 15 is formed integrally from the walls of the opening 16 of the slide member 7 ; thus , the transverse member extends from one inner side 16 a to the other inner side 16 b of the opening 16 . alternatively , hole ( s ) 15 a , running from one side to the other or on two sides having a hollow space therebetween in the slide member 7 permits the entry of a pivot pin 15 and or screw type arrangement ( a male screw head with threaded body inserted in a female pin having an internally threaded cylinder ) therein ; this operates in conjunction with the slot 11 of the forward handle 8 that engages the pivot pin 15 ( or transverse integral member ) thereby permitting the motion of the forward handle that as a consequence actuates the slide drive member 7 to ride the rail 18 downline thereby cutting tissues forward of the device . in order to complete this action , one has to first attach the forward handle to the curved portion or main body 1 between the shaft 4 and the rear handle 2 . the cutout slot 11 engages pin / member 15 a located within the of slide drive member 7 that is mounted on the shaft 4 so that the forward handle 8 grabs the pin 15 a and drives the slide drive member 7 forwards down the rail 18 as the forward handle 8 pivots on pin 13 within holes 12 , 12 a . this rail is integrally formed down the top center of the shaft 4 and begins forward of the juncture or main body 1 and ends down a portion of the operational plate 5 b . finally , the forward handle 8 and the rear handle 2 , 3 are biased away from each other by spring means 19 and 19 a . fig3 a describes a closeup right side elevation view of the front portion of the surgical rongeur with disposable and replaceable cutting blade in an embodiment herein . a slide drive member 7 sits atop the shaft 4 and is actuated by a user manipulating the handles to actuate a cutting movement whereby the slide and its associated blade 20 a cuts through any bio - material placed in the space between the blade 20 a and the end plate 5 a on the operational plate 5 b . it should be understood from the drawings that the end of the blade 20 a and the end plate or anvil 5 a forms a gapless interface there between . this end plate 5 a is disposed at an obtuse angle ( that is likewise matched by the forward part of the blade 20 a ) to the operational plate 5 b that juts out integrally and parallel thereto from the end of the shaft 4 ; moreover , two flanges 5 f extend the operational plate 5 b beyond the width of the slide drive member 7 as they reach outwards and upwards on either side thereof . it should be understood that the cutting blade 20 a is a disposable approximately upside down u shaped integral metal piece contoured to match the top surface of the end portion of the slide drive member 7 . this end portion is otherwise known as the recessed end 20 b of the slide drive member and has exposed protrusions that enable the easy attachment and removal of the blade 20 a upon corresponding perforations in the blade portion 20 a that engage the protrusions . fig3 b presents a closeup right side isometric view of an assembled front portion of the surgical rongeur with disposable and replaceable cutting blade in an embodiment herein showing essentially the same components as one shown in fig3 a . fig3 c , 3d , 3e together show the disassembled components comprising the front portions of the device having a shaft 4 , a sliding member 7 and a cutting blade 20 a . fig3 c illustrates a closeup right side isometric view of an a cutting blade used with the surgical rongeur in an embodiment herein . the cutting blade 20 a is a surgical metal piece shaped as an elongated thin parabolic curve formed from two arcs that unite in the center ; further , the blade 20 a is uniform longitudinally until it reaches the forward portion 22 thereof . at that point it is longer at the top of blade between the two curved parabolic legs than at the end of the two arcs ; in other words , the arcs taper down so that the high point of the blade 20 a is further forward than the endpoints of the two arcs . this identically matches the obtuse angular shape of the end plate 5 a or anvil such that they form a gapless interface when juxtaposed . finally , the two posterior right and left lateral surfaces of the blade 20 a are perforated with three circular holes 21 a linearly arranged near the bottom portion of the blade and on either side thereof for a total of six holes ; these are to be used to attach the blade 20 a to the forward recessed zone of the sliding member 7 . fig3 d describes a closeup right side isometric view of the front portion of the slide used in the surgical rongeur in an embodiment herein . it should be understood from the previous drawings that the slide drive member 7 is an elongated piece of surgical metal that starts as a gentle curved rounded shape and tapers until the approximate midpoint thereof at which point the device becomes linear in shape . this linear portion 20 c proceeds forward until a breakpoint is reached whereupon the final portion of the slide drive member is formed as a recessed region 20 b whose surface is smaller than the previous linear portion . this recessed region 20 b serves as a holder for the blade 20 a that is attached by two sets of three laterally disposed protrusions 21 b arranged linearly near the bottom edge of the recessed portion 20 b . to complete the attachment of the two together , a user places the blade 20 a near the recessed region 20 b and opens the blade 20 a slightly by hand and snaps it on the recessed region 20 b such that the six holes 21 a engage the protrusions 21 b thereby locking the blade onto slide drive member 7 . the blade 20 a extends over and beyond the end of the recessed region 20 b so as to be able to cut material between its forward leading edge 22 and the end plate 5 a . finally , a sizable portion of the slide drive member 7 has a depression or trapezoidal type cutout ( three sides of the trapezoid are visible the fourth side is virtual ) that serves as a slide depression 23 a to carry the aforementioned member 7 atop the rail 23 b ( 18 in fig1 ); to accomplish this , the rail is also a trapezoidal shape ( three sides likewise visible whilst the fourth is integral with the rail ) or any convenient shape that matches the depression 23 a . the forward end of the depression 23 a , the forward end of the recessed region 20 b and the forward end of the rail 23 b ( 18 ) can be placed together so that the forward portion of the recessed region 20 b and the forward end of the rail 23 b ( 18 ) form a fairly flat parallel surface ; then it should be understood that this depression 23 a begins at the end of the slide drive member 7 where the recessed region 20 b is and proceeds backwards therein until somewhat after the matching rail 23 b ends before the two curved under portions 17 . of course , the undersurface of the slide drive member is appropriately provided with any other necessary depressions to permit the forward motion of the slide drive member and the resetting thereof to its non - operational state whereby the slide drive member 7 is fully extended away from the end plate 5 a . finally , it is clear that a trapezoid shape was chosen here as it is larger at the top and tapers to the bottom on both sides so that the slide driver member 7 slide depression 23 a does not disengage from the rail 23 b . fig3 e presents a closeup right side isometric view of the front portion of the base runner used in the surgical rongeur to mount the slide thereon in an embodiment herein . the bottom portion of the shaft 4 has a central longitudinal trapezoidal protrusion 23 b or rail 18 disposed down the center of the shaft 4 thereby leaving space forming a ledge 23 d on either side thereof ; thus , along either side of the shaft or rail 23 b there is a ledge 23 d for the placement of the slide drive member 7 support surface 23 c to rest thereon . the slide drive member 7 is loaded onto the rail 23 b by inserting the posterior portion of the rail 23 b into the forward opening of depression 23 a where the recessed region 20 b is located . it should be understood that this rail 23 b and the shaft 4 is integrally formed along with the end plate 5 a , operational plate 5 b and flanges 5 f previously described ; further , it is clear that the rail 23 b ends before the end plate 5 a . this end plate 5 a is disposed at an obtuse angle to the operational plate 5 b that juts out integrally and parallel thereto from the end of the shaft 4 ; moreover , two flanges 5 f extend the operational plate 5 b beyond the width of the slide drive member 7 as they reach outwards and upwards on either side thereof . fig4 illustrates the cross section of cutting blade 20 a as depicted by the dashed line 24 in fig3 c . the inner face of the cutting blade 20 a mates with the recessed face 20 b when the cutting blade 20 a is securely affixed to the slide drive member 7 . the holes 21 a are located on both sides of the cutting blade 20 a . the holes 21 a mate and nest with protrusions 21 b on the slide drive member 7 when the cutting blade 20 a is securely affixed to mobile shaft 7 . fig5 describes the cross section at the distal end of the slide drive member 7 where it receives the cutting blade 20 a and is depicted by dashed line 25 in fig3 d . the recessed face 20 b is the outer profile of the cross section . the protrusions 21 b linearly disposed are shown on both sides of the slide drive member 7 . the slide depression 23 a is seen cut through the bottom surface of the slide drive member 7 . it should be noted that the slide drive member 7 has a slide depression 23 a that is symmetrically trapezoidal . fig5 also illustrates the slide drive members support surface 23 c that rest upon the ledge 23 d on either side of the rail 23 b . fig6 presents the cross section of the near distal end of the shaft 4 and is depicted by dashed line 26 in fig3 e . the rail 23 b is seen to have an outer profile that mates with depression 23 a . the flanges 5 f are illustrated on either side of the forward portion of the shaft 4 and form a channel for the support surface 23 c of the slide drive member 7 . fig7 illustrates the cross section of the far distal end of the shaft 4 proximal to the end plate 5 a along cross section 27 ; this view permits a showing of the flanges 5 f but the rail 23 b is no longer part of the profile . fig8 describes a side view of the mechanism of the surgical rongeur in an embodiment . fig9 presents a front cross section view along line 29 of fig1 of the slide drive member in physical union with the shaft . fig1 illustrates a front cross section view of the far distal end of the shaft 4 proximal to the end plate 5 a along cross section 27 of fig3 e ; this view permits a showing of the flanges 5 f but the rail 23 b is no longer part of the profile . fig1 describes a front cross section view along line 30 of fig3 b showing of the blade placed atop the slide drive member in physical union with the shaft . fig1 presents a front cross section view along line 31 of fig1 showing the blade front portion thereof atop the shaft . fig1 illustrates a front cross section view along line 32 of fig2 showing the shaft . fig1 describes a front cross section view along line 28 of fig2 showing the shaft having the central rail . fig1 presents a front cross section view along line 34 of fig2 showing the forward portion of the slide drive member . fig1 illustrates a front cross section view along line 33 of fig2 showing the blade . dull surgical instruments put the patient at risk due to ineffective and imprecise removal of tissue . further , blunt surgical tools tear tissue and can damage structures and tissues not intended to be damaged . thus , these are ineffective at removing tissue and as a consequence they can increase surgical time and the effort a surgeon makes in completing an operation . it is very common indeed that during the course of a surgical procedure cutting surgical tools become dulled and need to be changed during the course of a single operation . it is for this reason that an easy , effective and reproducible way is needed to maintain the sharpness of surgical rongeurs used in spinal surgery and other similar procedures that require an effective cutting device . this problem has been solved in the instant description and has been enabled in the surgical rongeur with disposable and replaceable cutting blade description and claimed below . further , the improved cutting mechanics and reduction of forces at the anvil allow for a smaller anvil that decreases the intrusion of the surgical tool into delicate neural tissues . this promotes the current trend in new techniques being used in spinal surgery that are aimed at reducing surgical trauma by reducing surgical exposures ; a small exposure needs less bulky tools . the above - described embodiments are merely exemplary illustrations of implementations set forth for a clear understanding of the principles of the invention . many variations , combinations , modifications or equivalents may be substituted for elements thereof without departing from the scope of the invention . therefore , it is intended that the invention not be limited to the particular embodiments disclosed as the best mode contemplated for carrying out this invention , but that the invention will include all the embodiments falling within the scope of the appended claims .