this invention as disclosed in the drawings has the principle use in the surgical environment but there exists no limiting language to prevent this invention to be practiced in other fields of use . the invention consists of three main elements , a handle , that holds the sharps blade , a shield that slides upon the handle , and having the shield also capable of removing the blade from the handle . this invention is a sharps device , such as a knife , scalpel or box opener , with a detachable shielding means which is capable of removing said sharp from said device consisting in fig1 , the invention is shown from a frontal left side view . handle 100 has a distal tapered butt end 101 and a proximal end which contains sharps mounting post 102 as seen in fig4 . handle 100 is basically rectangular in shape with 2 vertical walls and 2 horizontal surfaces conjoining the vertical walls . though the shape is not critical to the success of the invention , it conforms to the feel and balance required by surgeons in their medical instruments . channel 110 is located along at least one of the horizontal surfaces of the handle . it is shown in this invention to be on the upper horizontal surface but nothing prevents the channel to be in the lower horizontal surface with the associated shield interfaces located on the lower side as well or both surfaces . fig1 shows shield 200 located in the rearward open position , exposing the sharp 300 . sharp 300 having a cutting edge 303 which is opposite of the dull edge 305 , sharp 300 having a vertical orientation basically parallel to the vertical faces of the handle 100 . sharp 300 has a pointed proximal end 304 and a distal end containing the tang 301 of the blade . the blade 300 is mounted to handle 100 through an integral mounting means 302 which interfaces with the sharps mounting groove 103 . this invention is designed to accept industry standard surgical blades . fig1 a is a detailed view of the shield and handle interface when the shield is in the rearward or open position . shield 200 contains a side mounted button 210 where said button is mounted on the interior side of the device whereby it is accessible to the thumb of the user . button 210 is outwardly biased due to the bias of flange 213 which flexes through flexor 209 which is integral to shield 200 . the rear portion 205 of shield 200 is located behind the button area providing stability to the rear portion of the shield . the shape of rear portion 205 is designed so as to provide a close fit between the shield and the tapered butt end 101 as reasonable engineering tolerances will allow . also shown in fig1 a is the rear gutter 111 which is formed at the end of channel 110 after the button rides over rear portion inclined segment guide 112 . the user , as the shield transits through the channel will feel the button move inwardly , as guidance pin 212 , as highlighted in fig8 , which rides in channel 110 , approaches guide 112 and moves over guide 112 , prior to snapping into rear gutter 112 terminating against rear termination wall 105 . this tactile feel tells the user that the rearward travel is terminated and the gutter prevents accidental forward movement of the shield without deliberate user interaction to move the shield forward . it should be noted that the gutters are basically rectangular in nature with straight sides and bottoms . button 210 has anti - slip feature 211 , here shown as two vertical detents , which aid the user in finding the button through gloves and prevents accidental slippage of the users thumb from the button during use . alternate forms of anti - slip designs are available that can serve the same purpose or function . fig2 shows the right side of the handle which shows optional ruler 104 which can be incorporated into this right side of the handle . fig2 also highlights the radiused lead - in frontal edges . upper frontal edge 108 and lower frontal edge 109 are similar in construction and shape and are designed to accommodate the attachment of sharp 300 in either a upwards or downward orientation while attached to the proximal end 102 of the handle . steam hole 106 is present to allow for passage of steam from one side of the handle to the other . steam slot 107 , shown in fig3 , is recessed in order to facilitate the flow of steam during autoclaving and the depth of the slot is also used as a weighing method , where the amount of material relieved from the handle directly effects the weight and the weighting characteristics of the handle to the preference of the user . fig3 is an upper view highlighting channel 110 . forward inclined segment guide 113 is similar to the shape and function of rearward guide 112 . the users forward progress of the shield is terminated against forward termination wall 117 and the guidance pin 212 rides over guide 113 and naturally fall into forward gutter 118 , trapping the shield in the forward or closed position . ejectment inclined guide 114 is shown in fig3 and fig4 . the height of the incline is at least twice that of the other two guides , 112 and 113 . this increased height prevents accidental dislodgement of the shield in the forward position into the ejectment position . the user must consciously depress button 210 with a force at least twice that of the force necessary to transit the shield from the open to the closed position . this extra force again designed to prevent accidental ejectment of the sharp from the handle . once the user decides to eject the blade , the user depresses the button whereby pin 212 enters into ejectment bay 119 , as shown in fig4 , riding down ejectment slope 116 terminating into forward ejectment gutter 115 . at this point the blade has been removed , as discussed later , and the user retracts the shield , against wall 124 which defines the rear portion of ejectment bay 119 . forward gutter 118 is also used for shield attachment and detachment as well . for the user to remove the shield from the handle places the shield into the forward or closed positions with pin 212 in the forward gutter 118 . the user then must retract the button , opposite of depressing the button , to allow for pin 212 to clear gutter 118 and the shield is then slid to forwardly . this is another unique safety feature , whereby the user must use a motion opposite of the normal operating motions of depressing the button in order to remove the shield , thereby reducing the risk of accidental removal of the shield , possibly exposing the sharp . another unique safety feature is that the removal of the shield from the handle , necessitates the removal of the sharp from the handle as well , as discussed below , further reducing the risk of accidental contact with the exposed sharp . fig5 shows the lower horizontal surface of handle 100 showing the upper and lower tang stops 123 and 122 respectively . fig4 and fig5 detail the weighting bar 121 , which is designed to allow for specific user &# 39 ; s preferences regarding the weighting characteristics of their preferred scalpel . the height of bar 121 and contouring of bar 121 can adjust the amount and location of the weighting of the handle 100 . fig6 shows the rear or right side 206 of the exterior portion of shield 200 where it can be seen that the shield is not a solid cylindrical object . in the manufacturing process of forming the shield , which starts as a flat piece , mating area 208 is purposefully left as a gap to facilitate better steam movement during the autoclaving process and reduces the amount of material needed for the shield thereby reducing cost and weight . rear steam slots 207 allows for entrance of steam should the shield be in the open position during the autoclaving process . the shape of rear steam slot 207 and front steams slots 203 are shown in this example as curved arcs , but any shape or design is available so long as the purpose of steam passage is accomplished . fig7 shows the front view of shield 200 showing the concave entrance 204 which reduces the weight and materials needed while still giving protection over the critical middle part of the shield protecting users from the sharp proximate end 304 of said sharp 300 . fig7 a details the ejector means which is integral to shield 200 , whereby shield contains to ejector windows 213 , separated by a solid bar 214 along the exterior portion of shield 200 which separates the two ejector means . the ejector means consists of a shovel nosed ejectment mechanism 216 which is held in an extended position by extension 217 whereby mechanism 216 is substantially parallel to the interior face of shield 200 . each extension 217 holds each ejector mechanism 216 in a location whereby ejector mechanism 216 is coincident with tang 301 of blade 300 when the shield is in the closed position . in this invention , mechanism 216 is slightly under tang 301 , but does not have to be in this location while the shield is in the closed position . it is only critical that the mechanism is capable of removing the tang 301 of blade 300 while shield transits into the ejectment segment . each ejector mechanism slides laterally within lower or upper ejector guide 120 and 125 , as the shield transits between the open and closed position . fig9 and detail fig9 a show the position of the shield at the closed position . at this point , though not shown , mechanism 216 is appurtenant to tang 301 of sharp 300 . in fig1 and detail fig1 a , the shield is moved into the ejectment segment whereby the blade is removed from the sharps mounting post 102 , and freely falls into a sharps container guided by the interior portion of shield 300 . fig1 c details the relationship between mechanism 216 and tang 301 as the shield is moved forward . fig1 b details sharp 300 as the integral mounting means 302 as it is removed from mounting groove 103 . as described herein , due to the increased amount of pressure needed to move the shield into the ejectment portion from the closed position , the fact that mechanism 216 is behind tang 301 at this position is not a detriment , as accidental dislodgement is not a consideration . another unique feature of this invention is the ability to insert the sharp into either a cutting edge facing upwards or downwards as is more commonly done . due to the shape and location of the tang stops 122 and 123 , a sharps can be inserted in the normal cutting side down configuration as seen fig1 or a sharp can be inserted in an upward configuration such as seen in fig1 and 12 , as one can see the orientation of the number “ 3 ” on the butt portion of the handle 100 . since there are many surgeons and sharps users that are left handed , it is a unique advantage of this invention to be ambidextrous . currently left handed surgeon must use instruments designed for right handed users , where the controls are on the opposite side of the instrument and training on the instruments are aimed for right handed users , causing left handed users to either adapt to a right handed instrument or be forced to develop their own procedures . this invention allows for either a left handed or a right handed user to operate the device in the exact same manner , reducing the chances of errors due to improper handling and training on the use of the surgical device . it can be appreciated by those appropriately skilled in the art that changes , modifications or embodiments can be made to this invention without departing from the spirit , principles , theories , ideas or conceptions that have been disclosed in the foregoing . it is herein recognized that the embodiments disclosed by this description of the best mode of practicing this invention , which will be hereafter described in their full breadth in the claims and equivalents thereof .
a surgical scalpel is presented which combines the attributes of cost - effectiveness in design while being ambidextrous and autoclavable . the design of the device affords left handed or right handed medical personnel with the feel , weight and balance of the original metal unguarded scalpel , while maintaining safety through the shielding of the blade during non - use and the ability to dispose of the blade in a safe controlled manner without having to place ones hands near the unguarded sharp . surgeons of either dexterity are able to learn and operate using similar techniques and instruments heretofore not available to them . no longer must a left handed surgeon be forced into the right handed world to perform surgery . the device is designed to use existing styles of blades currently available without needing costly inventories of specially created blades for the multitude of other such devices on the market .