text: fig1 is a side perspective view of a sterile and humane rodent trap 10 according to a first embodiment of the present invention . the rodent trap 10 generally comprises an outer tubular member 14 that is open and one end and closed at the other , a telescoping inner tubular member 12 open at one end and closed at the other , with at least one entrance aperture 22 for the rodent near the closed end , a biasing member 18 coupled to both the inner tubular member 12 and outer tubular member 14 and adapted for compressing the two together to complete the trapping action , and a break - away bait stick 16 by which a rodent initiates the trapping action . in use , the bait stick 16 is loaded by lodging between the corner at the closed end of the outer tubular member 14 and the edge of inner tubular member 12 as shown ( the bait stick 14 may be pre - loaded as such at the place of manufacture ), and then coupling the biasing member 18 between the inner tubular member 12 and outer tubular member 14 to compress the two , thereby retaining the bait stick 16 in place . it has been found that the simplest way to pre - load the bait stick 16 is to insert it on the floor of the outer tubular member 14 , insert the inner tubular member 12 until the bait stick 16 is lodged , and then rotate the inner tubular member 12 with respect to the outer tubular member 14 approximately 180 degrees to arrive at the angled configuration as illustrated . the rodent trap 10 is then placed where a rodent will encounter it . a rodent will enter the trap through door 22 to reach the bait stick 16 . when the rodent nibbles part way through the bait stick 16 it snaps due to the compressing force of the biasing member , allowing the inner tubular member 12 and outer tubular member 14 to slide together . this closes and seals off the aperture 22 , forming the primary hermetic seal , and traps the rodent therein . the rodent dies humanely of asphyxiation in a short time . fig2 is a side exploded view of the sterile and humane rodent trap 10 of fig1 . the inner tubular member 12 is closed at one end by a tapered flange 24 and open at the other end , the open end being insertable into outer tubular member 14 . the extent of inner tubular member 12 may be formed with a cylindrical cross - section as shown , or alternatively may be formed with a rectilinear cross - section such as a triangle , square , pentagon , hexagon , octagon , spiral , or otherwise as a matter of design choice . the use of the words “ tubular ” or “ tube ” throughout this specification are intended to mean a hollow member or section that is not necessarily cylindrical . in any such case the shape of inner tubular member 12 must fit closely inside the outer tubular member 14 and yet allow free telescoping motion . the tapered flange 24 serves as a stop to limit insertion into the outer tubular member 14 , and also serves as the second of two sealing points to ensure the hermetic seal . both tubular members 12 , 14 are preferably formed of opaque plastic to give a visual indication of its contents , but may be formed of glass , cardboard or any other structurally suitable material . fig3 is a side cross - sectional view of the sterile and humane rodent trap 10 of fig1 - 2 illustrating the flange 24 . preferably , the junction of the flange 24 with the extent of inner tubular member 12 is tapered as shown at ( a ). the purpose of the tapered flange ( a ) is several - fold : 1 . the taper provides the stop for the sliding motion of the tripped trap and does so in a silent manner that eliminates the typical slamming or snapping sound of a typical trap that rodents quickly learn to avoid . 2 . as the tubes spring towards the closed position , the taper acts to wedge the tubes together , forming the second hermetic seal . 3 . as the tubes spring into the closed position , the taper acts to wedge the tubes together , locking them together with sufficient friction such that they are not easily or accidentally pulled apart during collection and disposal . the flange 24 may also have an integral catch 26 for the biasing member 18 , which may be a conventional rubber band or spring . the inner tubular member 12 also has at least one ( and preferably two opposing apertures 22 through which the rodents may gain entry for so long as the inner member 12 remains in its extended position . aperture ( s ) 22 are preferably formed flush through the inner tubular member 12 so as to be closed tightly against the outer tubular member when slid therein . this ensures a second hermetic seal ( supplemental to the flange 24 ), this double seal ensuring that no air or matter may enter or escape . the opposing end 32 of the inner tubular member 12 is angled downward toward the bottom , and the rim at the bottom is formed with a small notch 34 to seat the bait stick 16 . the outer tubular member 14 is likewise closed at one end and may include a flange 36 with feet or a flat footing to give the trap 10 a stable foundation on a flat surface . the flange 36 may also have an integral catch 38 for the biasing member 18 . the open end of the outer tubular member 14 slides over the inner tubular member 12 , the two being formed with conforming cross - sections to fit closely together and yet allow free telescoping motion . the biasing member 18 couples both the inner tubular member 12 and outer tubular member 14 together and compresses them against the loaded bait stick 16 . the biasing member 18 may be a simple rubber band , or a spring or any other suitable elastic member . the biasing member could be located on the outside or the inside of the trap . when the break - away bait stick 16 breaks , the trapping action comprises the inner tubular member 12 sliding freely into the outer tubular member 14 . the bait stick 16 has specific structural qualities and serves as a frangible strut when loaded to continue to hold the trap 10 open until a rodent nibbles and weakens it , at which point it collapses suddenly . in a preferred embodiment the bait stick 16 may be formed of small chips of meat , or other material attractive to an animal , compression molded together by a binder such as resin in the same manner that wooden particle board is made for lumber . the dimensions of the bait stick 16 approximate those of a conventional match stick . the controlled materials and dimensions result in a bait stick 16 that has a consistent and reproducible breaking strength under pressure . the bait stick 16 is preferably fashioned such that the animal must chew it near the center ( where the supporting strength is weakest ). this is accomplished either by concentrating the food or attractant near the center , or by coating the ends with a non - attractant coating . inciting the rodent to chew the bait stick 16 in a focused area at the center will result in the most rapid failure . there are a number of advantages to using the bait stick 16 as a frangible supporting member . the trap 10 does not need to be baited or set by the user , but can come pre - baited and set from the factory . because the bait itself serves as the holding device ( rather than merely mounted on a holding device as in conventional traps ), it is impossible for a rodent to eat the bait without springing the trap . moreover , it eliminates the need for more complex , more expensive , and more failure prone triggering mechanisms as described above in the prior art . the bait stick 16 is designed for single use . it is destroyed upon use ( the trap 10 cannot be reset and reused ), thereby assuring that contaminated animals and traps remain enclosed upon disposal . if desired the bait stick 16 can be impregnated with additives such as caffeine or epinephrine to increase metabolism and induce more rapid asphyxiation of the trapped animal . the bait stick could be ridged or tubular or otherwise shaped to be conducive to faster and more uniform structural failure . in operation , when the break - away bait stick 16 breaks , the trapping action comprises the inner tubular member 12 sliding freely into the outer tubular member 14 , thereby sealing off the apertures 22 and trapping the rodent therein . the double hermetic seal ensures that the rodent meets a timely and humane fate . moreover , the double ( redundant ) hermetic seals ensure that once the trap 10 is sprung no air or matter , in particular fleas , mites , ticks , feces , urine , blood , pathogens , microbes , or odors can be exchanged between the inside and outside of the closed trap 10 . because it is sealed , the dead animal cannot act as a source for production or distribution of infectious organisms . because of the hermetic seal , the trap 10 can be left unchecked indefinitely with no risk of contamination or unsanitary conditions . the hermetic seal results in quick asphyxiation , producing fast , painless , and non - traumatic death ( unlike the traditional methods of poison , glue , electrocution , or crushing force ) whereby the animal lays quietly in the trap and makes no attempt to chew or claw its way out , allowing for lightweight construction . death from asphyxiation produces no obvious physiological symptoms , reduction of physical and intellectual performance occurs without the individual ( even in humans ) being aware . because the trap is sealed , and because the animal feels no pain and quickly becomes increasingly stuporous the trapped animal makes no noise . additionally , the trap itself makes no noise when tripped . these advantages greatly reduce the tendency of rodents to develop common evasive behavior known as trap shyness . the above - described trap 10 design is simple and easy to manufacture , comprising only two open ended tubes 12 , 14 connected by a band 22 or spring to pull them together . the trap 10 is also very robust and cannot be easily set off when setting the trap , by external jostling , or by animals climbing on or around the exterior of the trap . the tapered flange 24 results in the tubes being effectively stuck together after the trap is sprung , preventing inadvertent opening and loss of the hermetic seal which would result in exposure to contaminants and defeat the purpose of a hermetic trap . the trap can be set up on un - level or irregular surfaces and will operate in any position . the trap can easily be scaled for different sized animals . the trap can be modified for live capture if the outer tube is perforated . fig4 is a side perspective view of an alternative embodiment of a sterile and humane rodent trap 100 according to the present invention . the rodent trap 100 generally comprises a cantilevered tubular member 112 closed at one end and open at another for entry of the rodent , the open end being closable by a trap door 122 for trapping the rodent . as before the tubular member 112 is preferably opaque to allow a vague view of the contents , and may be formed with a cylindrical cross - section as shown or alternatively with a rectilinear cross - section such as a square , pentagon , hexagon , octagon or otherwise as a matter of design choice . in this embodiment the tubular member 112 may be a conventional test tube . the tubular member 112 is cantilevered at the bottom center by legs 132 or any other fulcrum . the trap door 122 is preferably hinged to the rim of tubular member 112 at the open end . the hinge 144 may be a simple resilient flap joining the trap door 122 to the tubular member 112 , and hinge 144 may be integrally molded with the tubular member 112 and trap door 122 . the trap door 122 is biased closed against the open mouth of the tubular member 112 by a biasing member 140 coupled between the tubular member 112 and trap door 122 . again , the biasing member 18 may be a simple rubber band , or a spring or any other suitable elastic member . biasing member 140 is attached at one end to the floor of tubular member 112 by a catch 142 which may be integrally molded to the floor , and is attached at the other end to the inside of the trap door 122 by a catch 146 which may be integrally molded to the trap door 122 ( preferably at the exact center ). the rodent trap 100 is placed where a rodent will encounter it , and is set by inserting some bait and sliding it to the closed end of tubular member 112 ( the bait may be pre - loaded at the manufacturer ). next , the trap door 122 is opened against the bias of biasing member 140 and is tucked underneath the tubular member 112 . when lying flat on a surface and cantilevered onto the cocked trap door 122 , the weight of the tubular member 112 will retain the trap door 122 in its cocked position underneath the tubular member 112 . this “ setting ” or “ hold open ” mechanism relies on the weight of the trap itself and , in addition , the trap door 122 is hidden under the trap , making it more inviting and less threatening to rodents . fig5 is a side perspective view of the rodent trap 100 illustrating the hinge 136 and trap door 122 in a cocked position . the rodent has free access to the bait through the open end of the tubular member 112 . however , once it crosses the fulcrum of legs 132 its weight will cause the tubular member 112 to tip downward at the closed end 124 , and upward at the open end . the upward tilting at the open end allows the trap door 122 a degree of freedom to begin to pivot closed , and once it begins to close the biasing member gains considerable leverage against the trap door 122 and the trap door will snap shut to entrap the rodent therein . specifically , when the trap door 122 is fully open ( 270 degrees ) the biasing member exerts minimal force for closure ( the force instead being directed toward the hinge 144 ). however , when the rodent tips the trap 100 , the trap door 122 gains freedom to close slightly , changing the angle with which the biasing member 140 pulls on the trap door 122 , thereby resulting in a sudden and forceful closure of the trap door 122 . additionally , once the trap 100 has sprung , the orientation of the biasing member 140 across the end of the trap is such that a rodent attempting to back out of the trap will deflect the biasing member 140 causing it to pull the lid tighter still . the closure of the trap door 122 against the tubular member 112 not only traps the rodent therein , but also forms a hermetic seal . consequently , the rodent dies humanely by asphyxiation . unlike the embodiment of fig1 - 3 , the trap door 122 forms just a single hermetic seal , but testing has shown that the tension of the biasing member 140 can be adjusted to ensure that no air or matter may enter or escape . it also helps that the catch 146 is centrally located in the trap door 122 so that the biased closure imparts an even pressure around the rim of the tubular member 112 , ensuring a uniform seal . this embodiment is more amenable to being reset and reused , but is preferably discarded to assure that contaminated animals and traps remain enclosed upon disposal . it is also noteworthy that this embodiment may be formed from only three component parts 1 ) tubular member 112 ( which may be a conventional test tube ); 2 ) trap door 122 and hinge 144 , and 3 ) biasing member 140 . in all of the foregoing embodiments and suggested variations , a simple , inexpensive , safe , effective , and most importantly clean rodent traps 10 , 100 are disclosed with simple operating mechanisms that do not rely on poisons , neck - snapping , glue , or anything that could harm children or pets . because the relative volume of the tubular trap is so small as compared to the rodent , asphyxiation is extremely quick . thinner and lighter materials can be used because the rodent has very little time to chew or claw its way out of the trap , and this in turn results in low material costs . moreover , the traps are hermetic : the rodents remain locked in a sealed tube and never have to be touched for discarding . the closed traps and rodents can be disposed of in a sterile manner . this is especially beneficial in locations where extra cleanliness is required , such as hospitals , restaurants , or food processing plants . even if the trap is not checked regularly , the animal carcass is sealed away inside the tube for later disposal . it can be left set over weekends or vacation breaks , any place and any time that regular monitoring is not convenient . having now fully set forth the preferred embodiment and certain modifications of the concept underlying the present invention , various other embodiments as well as certain variations and modifications of the embodiments herein shown and described will obviously occur to those skilled in the art upon becoming familiar with said underlying concept . in all such cases an effective rodent trap is provided that imparts a humane death by asphyxiation in a positively hermetically - sealed container for sanitary disposal . it is to be understood , therefore , that the invention may be practiced otherwise than as specifically set forth in the appended claims .