the components of the liquid delivery assembly in accordance with preferred embodiments of the invention can be manufactured via known methods of plastic molding and manufacture , the details of which will be apparent to those having skill in the art . the precise shapes and sizes of the components described herein are not necessarily essential to the invention , since the invention is described with reference to illustrative embodiments . a preferred fluid delivery assembly in accordance with the invention comprises a dispensing cap having an applicator extension or tube , an interior piercing tip , a hollow channel extending throughout said piercing tip to the applicator tube and a base attachable to an external fluid reservoir . a sealed fluid reservoir having a region pierceable by said piercing tip on the cap is engaged to the cap . a multi - stage detent mechanism on said dispensing cap and fluid reservoir will allow said dispensing cap to captively engage said fluid reservoir in at least one inactive configuration where the fluid reservoir is not pierced and at least one active configuration where the fluid reservoir is pierced . such multi - stage detent mechanism is also capable of preventing said piercing tip from piercing said reservoir until a user elects to convert said inactive configuration into said active configuration . fluid reservoirs in accordance with the invention should be substantively inactive to the fluid or gel stored therein , pliable enough to allow fluid to be squeezed out , but hard enough to engage the cap portion to keep the cap from detaching or prematurely shifting into the active configuration . a non - exhaustive list of acceptable materials for the reservoir includes propylene , etaylene , nylon , k - resin , polypropylene , and polyethylene in either homo or copolymer versions . dispensing caps in accordance with the invention should be substantively inactive to the fluid or gel therein and sufficiently rigid to allow the piercing tip to puncture the fluid reservoir . a non - exhaustive list of acceptable materials for the cap includes propylene , etaylene , nylon , k - resin , polypropylene , polyethylene , polyoxymethylene , polyacetal , and aliphatic polyketones ( carilon ). a non - limiting example of a fluid delivery assembly constructed in accordance with preferred embodiments of the invention is shown generally as fluid delivery system 100 in fig1 . it will be appreciated that fluid delivery systems identified herein can also be used to deliver gels , with little or no modification . delivery system 100 includes a hollow fluid reservoir 110 or another suitable fluid delivering tube or source engaged with a dispensing cap 120 . reservoir 110 stores the fluid or gel therein . in a preferred embodiment of the invention , reservoir 110 stores a single dose of pesticide for a dog , cat , horse or other animal of appropriate size . dispensing cap 120 includes a short hollow cylindrical tube 130 , which terminates in a slanted piercing tip 140 . tube 130 can be of uniform width and extends perpendicularly from within an interior 151 of a dome 150 of dispensing cap 120 . tube 130 serves as a conduit from reservoir 110 to cap 120 . cap 120 is designed to selectively form an opening in reservoir 110 and provide a tip to dispense the fluid or gel therein in a convenient manner . cap 120 also includes an extended applicator tube 160 , which can be unitary with and extend from the top of dome 150 . applicator tube 160 terminates in a nozzle 170 . tube 160 defines a channel 161 , which extends from piercing tip 140 , through short tube 130 to nozzle 170 and defines a liquid passageway capable of communicating fluid from piercing tip 140 to a nozzle end 171 . it should be appreciated that extended applicator tube 160 and applicator nozzle 170 may adopt a variety of shapes and sizes consistent with different usage , other than what is depicted in fig1 . for example , the extended applicator tube may be longer or shorter and may contain a bend , a flare or a constriction . applicator nozzle 170 may taper into a narrow tip or contain one or more fur - spreading fin structures for accessing difficult to reach areas or terminate in a rounded blunt bulge to avoid damaging the skin of the pet when applying a parasiticide . in one embodiment of the invention , extended tube 160 , channel 161 and nozzle 170 can be conical , so that trimming back the tip can increase the diameter of the opening at the tip of channel 161 . the present invention is not limited to the extended applicator tube and applicator nozzle presented herein . it should be appreciated that the external surface of dome 150 may adopt a variety of features to facilitate usage . for example , an external surface top face 152 of dome 150 may contain a plurality of ridges capable of providing the user a firm grip during activation . fluid reservoir 110 includes a reservoir tip 115 . an upper end of tip 115 includes a pierceable region 190 , whereby the surface of the pierceable region 190 is proximal and perpendicular to cylindrical tube 130 when fluid reservoir 110 and dispensing cap 120 are engaged in an inactive position as shown in fig1 a . pierceable region 190 should be sufficiently wide to receive the outside diameter of cylindrical tube 130 when fluid reservoir 110 and dispensing cap 120 are engaged in an active configuration as shown in fig1 b . the area of pierceable region 190 may be adjusted to balance the force required for piercing against the force feedback once piercing occurs . to further reduce the force of piercing , the thickness of the material in the pierceable region 190 may be adjusted so that the outer diameter of pierceable region 190 is thinner than at its center . generally , the fluid reservoir and the dispensing cap should be appropriately sized with respect to the space within the dome of the dispensing cap , allowing the fluid reservoir and the dispensing cap to move from the inactive configuration to active configuration . fluid delivery assemblies in accordance with the invention can contain a multi - stage detent mechanism to provide multi - stage engagement , while preventing unintended activation due to inadvertent piercing of the fluid reservoir . a dispensing cap 200 in accordance with another embodiment of the invention is shown generally in fig2 . cap 200 is configured to work with a reservoir tip 300 shown generally in fig3 . a multi - stage detent between cap 200 and tip 300 is provided as a ridge 310 on an external surface 301 of fluid reservoir tip 300 and two retaining grooves 211 and 212 on an internal wall surface 202 of dispensing cap 200 . in an inactive configuration , ridge 310 engages retaining groove 211 and dispensing cap 200 is captively held on tip 300 of a fluid reservoir 350 during transport or storage without piercing a pierceable region 390 of fluid reservoir tip 300 . in an active configuration , ridge 310 engages retaining groove 212 and dispensing cap 200 is captively held on tip 300 of fluid reservoir 350 while a piercing tip 240 penetrates piercing region 390 . this brings the fluid content in an interior 351 of reservoir 350 into communication with a channel 261 of dispensing cap 200 , allowing the contents of fluid reservoir 350 to enter and flow through hollow channel 261 from piercing tip 240 and exit through a tip 271 of an applicator nozzle 270 . internal wall 202 of dome 205 of dispensing cap 200 is provided with screw threads 213 about internal wall 202 thereof . screw threads 213 are threadingly engageable with corresponding screw threads 314 on fluid reservoir 300 . the threading engagement between screw threads 213 and 314 ensures that piercing tip 240 will not breach fluid reservoir 300 at pierceable region 390 unless the user deliberately converts the inactive configuration into the active configuration by turning dispensing cap 200 in relation to fluid reservoir 300 to urge cap 200 and piercing tip 240 towards reservoir 300 and pierceable region 390 until ridge 310 of fluid reservoir 300 engages retaining groove 212 of dispensing cap 200 . thus , after cap 200 is urged out of its retained state in the inactive position , it becomes retained in the active state . it should be appreciated that other type of detent mechanism may be used instead of the mechanism shown in fig2 and fig3 . for example , the ridge may be present on the interior surface of the dispensing cap and two matching retaining grooves may be present on the fluid reservoir . other multi - stage detent mechanisms are suitable as well . the present invention is not limited to the selection of the engaging mechanisms presented herein . the features of another preferred embodiment of the invention are shown in fig4 a and 4b as assembly 400 . a dispensing cap 420 is configured to work with a reservoir tip 410 . multi - stage detention between cap 420 and tip 410 is accomplished via use of a ridge 415 on an external surface 411 of fluid reservoir tip 410 and two retaining grooves 451 and 453 inside and unitary with a base 450 of dispensing cap 420 . in an inactive configuration , ridge 415 engages retaining groove 453 and dispensing cap 420 is captively held on tip 410 of a fluid reservoir during transport or storage without piercing a pierceable region 490 of fluid reservoir tip 410 . in an active configuration , ridge 415 engages retaining groove 451 and dispensing cap 420 is captively held on tip 410 of a fluid reservoir 401 while a piercing tip 440 penetrates a piercing region 490 on tip 410 . this brings the fluid content in interior of reservoir 401 into communication with a channel 461 of dispensing cap 420 , allowing the contents of fluid reservoir 401 to enter hollow channel 461 from piercing tip 440 and exit through cap 420 . to prevent accidental activation , screw threading 455 inside base 450 of cap 420 is threadingly engageable with corresponding screw threading 415 on tip 410 . the threading mechanism ensures that piercing tip 440 will not breach pierceable region 490 unless the user deliberately converts the inactive configuration into the active configuration by turning dispensing cap 420 in relation to tip 410 until ridge 415 engages retaining groove 451 of dispensing cap 420 . in accordance with a preferred embodiment of the invention , piercing tip 440 is designed with a slant ( which can be symmetrical or asymmetrical ) to avoid a potential problem that a flap of material left on a piercing region 490 may partially cover the opening of a hollow channel 461 at piercing tip 440 and impede fluid flow . the angle for piercing tip 440 is preferably from 55 ° to 120 ° and most preferably from 60 ° to 90 °. in another preferred embodiment of the invention shown in fig5 and fig6 , two regions of an internal wall 502 of a dome 550 of a dispensing cap 500 are raised to form a pair of tab breakers 515 that extends from an edge 503 of dome 550 to a first retaining groove 511 . a pair of breakaway tabs 617 extends from an external surface 610 of a fluid reservoir 600 . a pair of pre - activation rims 619 on fluid reservoir 600 extends from and are unitary with fluid reservoir 600 . the pre - activation rims 619 are generally on the same plane with and flank breakaway tabs 617 without being directly connected with breakaway tabs 617 . a pair of bump stops 621 are provided on one end of each pre - activation rims 619 . the breakaway tab mechanism ensures that piercing tip 540 will not breach pierceable region 690 unless the user deliberately rotates dispensing cap 500 with enough deliberate force until the side of tab breakers 515 rests against bump stops 621 ( at which point tab breakers 515 are poised over and aligned with breakaway tabs 617 ), and push dispensing cap 500 onto fluid reservoir 600 , breaking breakaway tabs 517 from fluid reservoir 600 , and form the retained activated configuration . another preferred embodiment of the invention is shown in fig7 and fig8 . a dispensing cap 700 , in accordance with another embodiment of the invention is shown generally in fig7 . cap 700 is configured to work with a fluid or gel reservoir 800 shown generally in fig8 . the engagement between cap 700 and fluid reservoir 800 is accomplished via the use of a raised structure 850 and a pre - activation ridge 801 of a head region 810 of fluid reservoir 800 and a locking groove 773 and a pair of slanted cam followers 771 about an internal surface 751 of dome 750 thereof . they are shown as , but are not limited to being 180 ° apart and unitary with dispensing cap 700 . as shown in fig7 , internal wall 751 of dome 750 of dispensing cap 700 extends perpendicularly from edge 753 of dome 750 to approximately halfway up dome 750 where a smaller inside diameter of dome defines a second edge 755 and an internal wall 757 . the lower junction of internal wall 757 is shaped into locking groove 773 . two regions of internal wall 751 of dome 750 of dispensing cap 700 are raised to form slanted cam followers 771 . slanted cam followers 771 are preferably positioned in the region between edges 753 of dome 750 to edge 755 . as shown in fig8 , the top surface 815 of head region 810 includes a pierceable region 811 . a pair of pre - activation rims 850 on fluid reservoir 800 extend from and are unitary with fluid reservoir 800 . one end of each pre - activation rim 850 adopts a downward slanting region 851 , which further turns vertically downward to join a cap stabilizing ring 859 . a pair of lug locks 855 are notches provided on the lower edges 853 of each of slanting region 851 . in an inactive configuration , a ridge 813 on head region 810 is engaged with a locking groove 759 to prevent accidental activation and dispensing cap 700 is captively held on head 810 of fluid reservoir 800 during transport or storage without piercing the pierceable region 819 . to put a channel 761 of cap 700 in communication with fluid reservoir 800 , fluid reservoir 800 and dispensing cap 700 are pushed towards each other with sufficient force to urge ridge 813 on head region 810 out of locking groove 759 and rotated until slanted cam followers 771 advance through a pair of gaps 861 between and defined by pre - activation rims 850 . once cam followers 771 drop into gaps 861 and make contact with the upper edge of downward slanting region 854 , dispensing cap 700 and fluid reservoir 800 may be turned so that slanted cam followers 771 move in spaces 863 between and defined by lower edge of pre - activation rims 850 and the upper edge of cap stabilizing ring 859 until cam followers 771 enter lug locks 855 . during rotation , a piercing tip 740 is gradually lowered to penetrate pierceable region 813 . in the activated condition , a top surface 815 of head region 810 contacts an inner ceiling 759 of dome 750 , thereby creating a seal to prevent fluid leakage during dispensing . in another embodiment of the invention , shown in fig9 a , 9 b and 9 c , dispensing cap 900 has a base 950 and an applicator tube 980 . dispensing cap 900 is configured to work with and dispense fluid from a fluid reservoir 910 . a top surface 951 of base 950 contains a plurality of ridges 953 capable of providing the user a firm grip during activation . applicator tube 980 contains two opposing fin structures 982 constructed and arranged to be able to part the fur coat of the animal . a nozzle end 981 of applicator tube 980 has a notch 983 . when nozzle end 981 is in contact with the skin of the animal , the space formed between notch 983 and the skin permits the outflow of parasiticde . fin structures 982 help part the animal &# 39 ; s fur and the notch permits smooth fluid flow even if the tip is resting on the skin of the animal . it should be appreciated that the fur and insecticide spreading fins and the notch may adopt a wide variety of shapes and configurations . another preferred embodiment of the invention is shown in fig1 and fig1 . a dispensing cap 1000 shown generally in fig1 is configured to work with a fluid reservoir 1100 shown generally in fig1 . it should be noted that the fluid reservoirs identified herein can also be gel reservoirs . the engagement between cap 1000 and fluid reservoir 1100 is accomplished via the use of a raised structure 1150 and a pre - activation ridge 1101 of a head region 1115 of fluid reservoir 1100 and a locking groove 1073 and a pair of slanted cam followers 1071 about an internal wall 1051 of dome 1050 thereof . these are shown as , but are not limited to , being 180 ° apart and unitary with dispensing cap 1000 . as shown in fig1 , internal wall 1051 of dome 1050 of dispensing cap 1000 extends perpendicularly from an edge 1053 of dome 1050 to approximately halfway up dome 1050 where a smaller inside diameter of dome defines an internal ledge 1055 and an internal wall 1057 . the lower junction of internal wall 1057 is shaped into locking groove 1073 . two regions of internal wall 1051 of dome 1050 of dispensing cap 1000 are raised to form slanted cam followers 1071 . slanted cam followers 1071 are generally positioned in the region between edge 1053 of dome 1050 and edge 1055 . as shown in fig1 , a top surface of head 1115 includes a pierceable region 1113 . a pair of pre - activation rims 1150 on fluid reservoir 1100 extend from and are unitary with fluid reservoir 1100 . one end of each pre - activation rim 1150 adopts a downward slanting region 1151 , which further turns vertically downward to join a cap stabilizing ring 1159 . a pair of notched lug locks 1155 are provided on lower edges 1153 of each of slanting region 1151 . a fluid reservoir 1200 of another preferred embodiment of the invention are shown generally in fig1 a and 12b . a top surface 1215 of a head 1210 includes a pierceable region 1213 . a pair of pre - activation rims 1250 on fluid reservoir 1200 extend from and are unitary with fluid reservoir 1200 . one end of each pre - activation rim 1250 adopts a downward slanting region 1251 , which further turns vertically downward to join a cap stabilizing ring 1259 . a pair of notched lug locks 1255 are provided on a lower edge 1253 of each of slanting region 1251 . the partial cross - sectional view of an activated configuration of a system in 1399 in accordance with still another embodiment of the invention is shown in fig1 . in the activated condition , a fluid channel 1361 of a cap 1300 pierces a pierceable region 1313 on a top surface 1315 of a head region 1310 of a fluid supply 1301 and is in fluid communication with fluid supply 1301 . top surface 1315 of head region 1310 contacts an inner ceiling 1359 of a dome 1350 , thereby creating a seal to prevent fluid leakage during dispensing . a pair of cam followers 1371 on an inside wall 1351 of dome 1350 of cap 1300 travels in spaces 1363 between and defined by lower edge of a pre - activation rims 1311 and the upper edge of a cap stabilizing ring 1319 on head region 1310 . in another embodiment of the invention , the applicator tip branches into a forked dispensing manifold having multiple , preferably 2 to 5 , and most preferably 3 , projections or tines . at least one projection has an opening at the distal end to dispense fluid from the fluid reservoir . fig1 a and 14b show an applicator cap 1400 of a fluid delivery assembly in accordance with another embodiment of the invention . the distal portion of cap 1400 is connected to a forked dispensing manifold 1480 having a central projection tine 1481 and two side projection tines 1483 . the distal end of central tine 1481 has an opening 1482 . a channel 1461 extends from opening 1482 along the length of central tine 1481 through a base 1450 of applicator cap 1400 . central tine 1481 and side tines 1483 can further adopt a elliptical or tapered circumference to aid the parting of hair . other embodiments with four or more projections tines or dispensing ports at the end of each projection tines are acceptable . fig1 a and 15b show an applicator cap 1500 of a fluid delivery assembly in accordance with another embodiment of the invention . the distal portion of cap 1500 is connected to a forked dispensing manifold 1580 having three projection tines 1581 . the distal portion of tines 1581 are further curved from the plane of manifold 1580 to form a claw - like bend . the distal ends of one or more of tines 1581 each have an opening 1582 . a branched channel 1561 extends from opening 1582 along the length of tines 1581 and dispensing manifold 1580 through a base 1550 of applicator cap 1500 . tines 1581 , manifold 1580 and base 1550 may be constructed as an unitary piece or as separate pieces to be attached by the user over the end of a shorter tip . fig1 a and 16b show an applicator cap 1600 of a fluid delivery assembly in accordance with the invention . the distal portion of cap 1600 is connected to a forked dispensing manifold 1680 having three projection tines 1681 . the distal portion of tines 1681 are tapered . the distal ends of tines 1691 each have an opening 1682 . a branched channel 1661 extends from opening 1682 along the length of tines 1681 and dispensing manifold 1680 through a base 1650 of applicator cap 1600 . tines 1681 , manifold 1680 and base 1650 may be constructed as an unitary piece or as separate pieces to be attached by the user over a shorter tip structure . the examples provided herein are merely exemplary , as a matter of application specific to design choice , and should not be construed to limit the scope of the invention in any way . in one embodiment of the invention the tube for delivering the liquid or gel is about 15 to 25 mm long , preferably 18 to 20 mm long and has an internal diameter of about 1 to 4 mm , preferably 2 to 3 mm . in an embodiment of the invention , the reservoir has a volume of about 0 . 01 to 100 ml . thus , while there have been shown and described and pointed out novel features of the present invention as applied to preferred embodiments thereof , it will be understood that various omissions and substitutions and changes in the form and details of the disclosed invention may be made by those skilled in the art without departing from the spirit of the invention . it is the intention , therefore , to be limited only as indicated by the scope of the claims appended hereto . it is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which , as a matter of language , might be said to fall therebetween .
an applicator tip is provided for operating in conjunction with a pierceable fluid reservoir . assemblies in accordance with the invention can lead to an exceptionally easy to use , safe , and convenient system and method of applying a fixed dosage of chemicals to which a user might wish to avoid contact , such as parasiticides . the cap - applicator can have an internal piercing tip capable of piercing the reservoir when the assembly is converted into an active configuration . projections can be provided , in the form of fins on a tube or a multi - prong structure with straight or curved projections . the tips of one or more projections can include dispensing ports or the ports can be recessed from the distal tip , such as in a notch , so as not to be obstructed if the distal tip of the cap is pressed against an animal to dispense the fluid .