for readiest understanding of the invention , it is helpful to describe a prior art feeding bottle in some detail . thus , in fig1 a to 1 d , the components of a typical prior art bottle assembly 60 are shown , comprising a bottle 10 , a nipple 20 , and a collar 30 ( fig1 a ). bottle 10 ( fig1 b ) is formed of plastic or glass . bottle 10 is of hollow construction , with outer wall 11 closed off at closed end 12 , and with an opening 14 at open end 13 . open end 13 has exterior threads 15 . nipple 20 ( fig1 c ), formed of silicone or latex , has an outward flange 21 . nipple 20 has a neck 22 formed by flange 21 and a retaining rib 23 . nipple 20 has a closed end 24 with a plurality of perforations 28 . nipple 20 is of hollow construction , forming a cavity 27 . flange 21 has an opening 26 that allows a liquid ( not shown ) to be drawn into cavity 27 and out through perforations 28 . collar 30 ( fig1 d ), which is formed of plastic , has a side 31 with interior threads 34 . collar 30 has an inward flange 35 with an opening 36 . collar 30 has an end 32 , with opening 33 . flange 35 has an outward facing retaining rib 37 . fig1 e shows a section of a nipple 20 mated with a collar 30 , forming a nipple - collar assembly 50 . closed end 24 is drawn through opening 33 and opening 36 , such that neck 22 is nested in opening 36 and nipple 20 is retained in this position by flange 21 and retaining rib 23 . fig1 f shows a section of a prior art one - piece nipple 51 , which is formed of rubber and plastic in a permanent bond . one - piece nipple 51 may be used in place of a two - piece nipple - collar assembly ( not shown ). fig1 g shows a bottle 10 mated to a nipple - collar assembly 50 , forming a bottle assembly 60 . open end 13 is inserted into opening 33 , and threads 15 are engaged with threads 34 . open end 13 and flange 21 , held together with pressure from flange 35 , form a liquid - proof seal . fig1 h shows a section of an optional prior art cover 52 , which is formed of plastic . cover 52 has an open end 53 with opening 54 . cover 52 has a closed end 55 , with a centrally located recess 56 on the interior side . cover 52 has a side 57 with an inward retaining rib 58 . fig1 i shows a section of a cover 52 mated to a bottle assembly 60 ( see fig1 j ). recess 56 conforms to and covers closed end 24 . fig1 j shows the details of retaining a cover 52 on a collar 30 . an inward retaining rib 58 on cover 52 is engaged with an outward retaining rib 37 on collar 30 , forming a snap closure . a one - piece example of the invention is shown in fig2 a to 2 d . a container insert 100 ( fig2 a ) of hollow construction , cylindrical in shape , formed of plastic , preferably transparent , with a plurality of graduations 70 on the outside . container insert 100 has an outer wall 101 ( fig2 b ), closed off at closed end 102 , with an opening 105 at open end 104 . outer wall 101 is curved slightly inward at open end 104 ( fig2 b and 2c ). outer wall 101 has a plurality of slight castellations 72 with rounded corners 73 along the edge of opening 105 ( fig2 c ). container insert 100 can be filled with a material 62 through opening 105 ( fig2 d ). fig2 e to 2 g show a one - piece container insert 100 in use . container insert 100 , filled with a material 62 , is mated with a nipple - collar assembly 50 by inserting open end 104 into opening 26 ( fig2 e ). a liquid - proof seal is created by open end 104 and neck 22 , protecting material 62 . nipple - collar assembly 50 , with container insert 100 and material 62 , is mated to a bottle 10 , which also contains a liquid 61 ( fig2 f ). this is the storage position for container insert 100 . liquid 61 and material 62 cannot communicate and may be stored separately in this configuration , ready for mixing , for as long as the sterility of the environment in which it was prepared allows . when mixing is desired , nipple 20 is depressed with enough force to dislodge container insert 100 from nipple 20 ( fig2 g ). open end 104 is unsealed , allowing material 62 and liquid 61 to mix through opening 105 . after agitating bottle assembly 60 the mixture can be administered . a two - piece example of the invention is shown in fig3 a to 3 e . a container insert assembly 250 ( fig3 a ), comprising an insert body 200 of hollow construction , cylindrical in shape , formed of plastic , preferably transparent , with a plurality of graduations 70 on the outside , and a sealing member 210 shaped like a cap . insert body 200 has an outer wall 201 ( fig3 b ), with an opening 203 at open end 202 and an opening 205 at open end 204 . outer wall 201 is curved slightly inward at open end 204 ( fig3 b and 3c ). outer wall 201 has a plurality of slight castellations 72 with rounded corners 73 along the edge of opening 205 ( fig3 c ). sealing member 210 is attached to insert body 200 at open end 202 ( fig3 d ). sealing member 210 has a side 211 ( fig3 e ) with an inward rib 212 , which engages with an outward rib 208 on outer wall 201 at open end 202 , forming a removable liquid proof snap closure . fig3 f to 3 j show a two - piece container insert assembly 250 in use . an insert body 200 is mated with a nipple - collar assembly 50 by inserting open end 204 into opening 26 ( fig3 f ), forming a liquid - proof seal between open end 204 and neck 22 . insert body 200 and nipple - collar assembly 50 are inverted , and a material 62 is added through opening 203 ( fig3 g ). a sealing member 210 is attached to insert body 200 at open end 202 , forming a container insert assembly 250 ( fig3 h ), and with nipple - collar assembly 50 material 62 is sealed . nipple - collar assembly 50 , with container insert assembly 250 and material 62 , is mated to a bottle 10 , which also contains a liquid 61 ( fig3 i ). this is the storage position for container insert assembly 250 . liquid 61 and material 62 cannot communicate and may be stored separately in this configuration , ready for mixing , for as long as the sterility of the environment in which it was prepared allows . when mixing is desired , nipple 20 is depressed with enough force to dislodge container insert assembly 250 from nipple 20 ( fig3 j ). open end 204 is unsealed , allowing material 62 and liquid 61 to mix through opening 205 . after agitating bottle assembly 60 the mixture can be administered . the preferred embodiment of the invention is shown in fig4 a to 4 e . a container insert assembly 350 ( fig4 a ), comprising an insert body 300 of hollow construction , cylindrical in shape , formed of plastic , preferably transparent , with a plurality of graduations 70 on the outside , and a sealing member 310 shaped like a cap with a pushrod 315 in the inside center . insert body 300 has an outer wall 301 ( fig4 b ), with an opening 303 at open end 302 and an opening 305 at open end 304 . outer wall 301 is curved slightly inward at open end 304 ( fig4 b and 4c ). outer wall 301 has a plurality of slight castellations 72 with rounded corners 73 along the edge of opening 305 ( fig4 c ). sealing member 310 is attached to insert body 300 at open end 302 ( fig4 d ). pushrod 315 , with a bulb 316 on its end , is long enough to protrude from opening 305 . outer wall 301 has a flange 308 at open end 302 ( fig4 e ), which seats in a groove 314 on sealing member 310 , formed by a side 312 and a flange 313 , providing a liquid - proof seal . fig4 f to 4 l show a container insert assembly 350 in use . an insert body 300 is mated with a nipple - collar assembly 50 by inserting open end 304 into opening 26 ( fig4 f ), forming a liquid - proof seal between by open end 304 and neck 22 . insert body 300 and nipple - collar assembly 50 are inverted , and a material 62 is added through opening 303 ( fig4 g ). a sealing member 310 is attached to insert body 300 at open end 302 , pushing pushrod 315 through material 62 , forming a container insert assembly 350 ( fig4 h ), and with nipple - collar assembly 50 , material 62 is sealed . when an optional cover 52 is attached to nipple - collar assembly 50 with container insert assembly 350 ( fig4 ), closed end 24 , when slightly compressed by recess 56 , should not come in contact with pushrod 315 . nipple - collar assembly 50 , with container insert assembly 350 and material 62 , is mated to a bottle 10 , which also contains a liquid 61 ( fig4 ). this is the storage position for container insert assembly 350 . liquid 61 and material 62 cannot communicate and may be stored separately in this configuration , ready for mixing , for as long as the sterility of the environment in which it was prepared allows . when mixing is desired , closed end 24 of nipple 20 is depressed ( fig4 k ), exerting enough force on pushrod 315 to dislodge sealing member 310 from insert body 300 . open end 302 is unsealed , and material 62 and liquid 61 can mix through opening 303 . nipple 20 is depressed further to dislodge insert body 300 from nipple 20 ( fig4 l ). open end 304 is also unsealed , allowing material 62 and liquid 61 to mix through both opening 305 and opening 303 , facilitating a thorough mixing . after agitating bottle assembly 60 the mixture can be administered . a three - piece example of the invention is shown in fig5 a to 5 f . a container insert assembly 450 ( fig5 a ), comprising an insert body 400 of hollow construction , cylindrical in shape , formed of plastic , preferably transparent , with a plurality of graduations 70 on the outside , and two sealing members 410 shaped like caps . insert body 400 has an outer wall 401 ( fig5 b ) with an opening 403 at each end . outer wall 401 has a plurality of slight castellations 406 along the edge of each opening 403 ( fig5 c ). each sealing member 410 has a side 412 with a plurality of slight castellations 416 ( fig5 d ). sealing members 410 are attached to insert body 400 at each end ( fig5 e ). outer wall 401 has a flange 408 at both ends , each which seats in a groove 414 on a sealing member 410 ( fig5 f ), formed by side 412 and a flange 413 , providing a liquid - proof seal . each sealing member 410 has a fin 415 on the outside . fig5 g to 5 j show the three - piece container insert assembly 450 in use . an insert body 400 is mated with a sealing member 410 at one end , and filled with a material 62 through the other ( fig5 g ). a second sealing member 410 is mated to the open end of insert body 400 , forming a container insert assembly 450 ( fig5 h ) and sealing material 62 . container insert assembly 450 , with material 62 , is placed inside a bottle assembly 60 , which also contains a liquid 61 ( fig5 i ). this is the storage position for container insert assembly 450 . liquid 61 and material 62 cannot communicate and may be stored separately in this configuration , ready for mixing , for as long as the sterility of the environment in which it was prepared allows . when mixing is desired , bottle assembly 60 is shaken with enough force to dislodge each sealing member 410 from insert body 400 ( fig5 j ). the ends of insert body 400 are unsealed , allowing material 62 and liquid 61 to mix through both openings 403 . after agitating bottle assembly 60 mixture can be administered . the container inserts can also be prepackaged for immediate use . fig6 a shows a container insert 100 , filled with a material 62 , with open end 104 sealed using a sealing member 74 , and enclosed in a packaging 71 . sealing member 74 can be a cellophane diaphragm held in place using a non - permanent adhesive or heat bond such that sealing member 74 can be easily removed using a pull tab 75 . packaging 71 can be a foil wrapper . fig6 b shows a container insert assembly 350 , filled with a material 62 , with open end 304 sealed using a sealing member 309 , and enclosed in a packaging 71 . sealing member 309 , made of a suitable rigid plastic , is held in place by friction against outer wall 301 , prevents an accidental force on pushrod 315 that might dislodge sealing member 310 , and can easily be removed . fig6 c shows a container insert assembly 450 , filled with a material 62 , and enclosed in a packaging 71 . accordingly , the reader will see that the container insert of this invention can be used to store a material separately inside a bottle , and release the material into the bottle when desired . furthermore , the container insert has the additional advantages in that : it permits the caregiver to prepare the bottle in a controlled environment , facilitating cleanliness and accurate measurements ; it permits the caregiver to mix the contents when desired without reopening the bottle , eliminating a significant chance of contamination ; it permits the caregiver to mix the contents quickly and with minimal attention , even one handed with tactile senses only ; its simple design allows ease of cleaning ; it works with bottles the caregiver already possesses . although the description above contains many specificities , these should not be construed as limiting the scope of the invention but as merely providing illustrations of some of the presently preferred embodiments of the invention . for example , the container insert body can be made of a bag to work with prior art bag - style bottles ; the container insert can be used in bottles other than for feeding infants , including geriatric , invalid , and livestock care ; the insert container can be shaped differently to accommodate different bottles . thus the scope of the invention should be determined by the appended claims and their legal equivalents , rather than by the examples given .
a nursing bottle insert that stores a measured amount of powder . the insert resides inside the bottle along with a correspondingly measured amount of water for the sealed powder to mix with . the powder and the water are allowed to mix when desired by applying a force external to the bottle .