embodiments of the invention will now be described with reference to the figures , wherein like numerals reflect like elements throughout . the terminology used in the description presented herein is not intended to be interpreted in any limited or restrictive way , simply because it is being utilized in conjunction with detailed description of certain specific embodiments of the invention . furthermore , embodiments of the invention may include several novel features , no single one of which is solely responsible for its desirable attributes or which is essential to practicing the invention described herein . fig1 shows a cross - sectional view of the cervix 10 , uterine body 15 and fallopian tubes 20 . the cervix 10 ( or neck of the uterus ) is the lower , narrow portion of the uterus where it joins with the top end of the vagina . it is cylindrical or conical in shape and protrudes through the upper anterior vaginal wall . the portion projecting into the vagina is referred to as the portio vaginalis 25 . the cervix &# 39 ; s opening is called the os 30 . the size and shape of the os and the cervix vary widely with age , hormonal state , and whether the woman has had a vaginal birth . at labor , the cervix dilates or opens to admit the infant &# 39 ; s head . fig2 a - 2e show views looking “ head - on ” at the cervical face 35 ( a - a in fig1 ). for women who are not in labor , the cervix appears to have a small circular dimple 30 ( os ) at its center . this is a closed cervix . it will not admit a finger . fig2 a shows an example of a cervix that is not dilated , so the dilation measurement would be 0 centimeters ( cm ). fig2 b shows an example of the first stage of cervical dilation of the cervical os 30 a . as labor progresses , the cervical os 30 b starts opening . in fig2 c , the practitioner may be able to insert one finger into the cervical opening , so the dilation measurement might be considered 1 cm for most practitioners . in fig2 d , the cervical opening 30 c opens more and the practitioner may be able to insert two fingers into the cervical opening , so the dilation measurement might be considered 2 cm . beyond 2 cm of dilation , or cervical dilation that will accommodate approximately two fingers for most practitioners , critical differences in cervical measurements between practitioners may emerge . measurement differences between practitioners may become a critical issue for treatment during labor , as described above in the background . fig2 e shows dilation of the cervical opening that has opened between 3 cm 30 d ( left side ) and 9 cm 30 e ( right side ). between 3 cm and 9 cm , there is no consistent measurement standard that practitioners use . as mentioned previously , measurement tactics are not standardized and there is no testing of accuracy or precision of the measurements . the ideal method and apparatus for use during labor for measuring cervical dilation may include one or more of the following : no risk of cervical trauma beyond that of a simple digital vaginal examination . no cumbersome attachments to the patient that may restrict movement or comfort . highly reproducible results / readings between practitioners and within the same practitioner ( precision ). the disclosed invention is designed to provide highly reproducible results / readings between practitioners and within the same practitioner . fig3 a is an overall view and fig3 b is a close - up view showing one embodiment of a cervical dilation reading apparatus 100 incorporating a measuring mechanism 105 as part of a sterile glove 110 to provide accurate and reproducible readings of cervical dilation . in the embodiment shown , the measuring mechanism 105 includes a measuring device 115 spanning between two adjacent fingers 120 a , 120 b of the glove . in other embodiments , the measuring device 115 may span more than two fingers , span non - adjacent fingers , or be incorporated into the sterile glove by other means . the measuring device 115 has a first portion 115 a attached to a fixed or stable attachment 125 at a tip or end of the first finger , such as finger 120 a and a second portion 115 b coupled to a slidable attachment 130 at the tip or end of the second finger , such as finger 120 b . slidable attachment — in use , the practitioner would insert the first finger 120 a and the second finger 120 b into the cervical opening 30 . the practitioner would place the first finger 120 a on one side of the cervical opening 30 and then move the second finger 120 b toward the other side of the cervical opening . the first portion 115 a of the measuring device 115 is fixed to finger 120 a and the second portion 115 b of the measuring device 115 slides through slidable attachment 130 of the second finger 120 b , thereby lengthening the measuring device 115 to obtain the correct dilation measurement . once to the other side , the practitioner would then withdraw the reading apparatus 100 and read the dilation measurement from the second portion 115 b of the measuring device 115 . slidable attachment locking mechanism — in some cases , the measuring device 115 may move or change length as it is being withdrawn after the dilation measurement , so in some embodiments the slidable attachment 130 includes a locking mechanism to fix the length of the measuring device 115 after the dilation measurement . in some embodiments , the slidable attachment 130 includes a locking mechanism that is designed to allow the measuring device 115 to slide in only one direction 135 to lengthen the measuring device 115 without any back sliding 140 after dilation measurement , such as shown in fig3 b . this one - way action allows any practitioner to utilize the reading apparatus 100 and , once the measuring device 115 is locked in place , obtain the same measurement as any other practitioner would obtain with the same or similar device . the locking mechanism allows the measuring mechanism 105 to be withdrawn without the measuring device 115 moving , thereby getting the most consistent results between practitioners and maximizing patient comfort and practicality . fig3 c - 3e show some embodiment examples of a locking mechanism for use with a slidable attachment . fig3 c shows one embodiment of a measuring device 115 having thin projections , collapsible arrows , or barbs 145 that compress or collapse as they go through the locking mechanism of the slidable attachment 130 in a first direction 135 when the fingers 120 a , 120 b are separated . the thin projections or collapsible arrows 145 then expand after going through the locking mechanism , preventing them from moving backward in a second direction 140 , thereby locking the measuring device 115 in the substantially extended state after measuring the dilation measurement . this will then lock the measuring device 115 in the correct length for the dilation measurement . fig3 d shows another embodiment of a measuring device 115 having ridges 150 that “ pop through ” the locking mechanism of slidable attachment 130 in a first direction 135 as the fingers 120 a , 120 b are separated . once the ridges 150 “ pop through ” the locking mechanism of the slidable attachment 130 , the measuring device 115 cannot move backward in a second direction 140 , thereby locking the measuring device 115 in the substantially extended state after measuring the dilation measurement . this will then lock the measuring device 115 in the correct length for the dilation measurement . fig3 e shows another embodiment of a measuring device 155 that uses a cable tie or tie - wrap , also known as a hose tie , zap - strap , or zip tie with a ratcheting mechanism 160 for locking the measuring device 155 on the slidable attachment 130 . the measuring device 155 slides in a first direction 135 as the fingers 120 a , 120 b are separated . once through the ratcheting mechanism 160 , the measuring device 155 can &# 39 ; t move backward in a second direction 140 , thereby locking the measuring device 155 in the substantially extended state after measuring the dilation measurement . this will then lock the measuring device 155 in the correct length for the dilation measurement . in some embodiments , the measuring device 115 includes material that , due to friction with the slidable attachment 130 , resists movement through the locking mechanism of the slidable attachment 130 , such that after going through the opening , friction prevents the measuring device 115 from moving backward in a second direction , thereby locking the measuring device 115 in the substantially extended state . 1 n some embodiments , the measuring device 115 includes material that , due to pressure from the slidable attachment 130 , resists movement through the locking mechanism of the slidable attachment 130 , such that after going through the opening , pressure prevents the measuring device 115 from moving backward in a second direction , thereby locking the measuring device 115 in the substantially extended state . in some embodiments , the practitioner needs to be able to move fingers around at will while searching for the edges of the cervix without worrying about overshooting the measurement . in this case , the locking mechanism may be configured to allow sliding or movement of the device in a second direction through the slidable attachment when force is applied to the measuring device in a second direction . this allows the practitioner to tighten it back up by pulling on the measuring device . measuring mechanism — the measuring device 155 of the measuring mechanism 105 is used to measure dilation of the cervical opening as labor progresses and can be made of any pliable material that would be suitable for measurement purposes . in the embodiments shown , the measuring device is a string having markings to measure dilation , preferably in centimeters , but other measurement units may be used . different measuring mechanisms could be used to make the determination of measuring device 115 length , some examples are described below . if no markings are utilized on the measuring device 115 , the length of the measuring device 115 can be compared to a ruler by the practitioner to determine the length after the measurement is complete . fig4 a - 4c show some embodiment examples of measuring devices that have markings to measure the dilation measurement during labor . this system makes it fast and easy , with consistent results , for the practitioners to use the measuring device to measure dilation . while the embodiments below will be described with a string , other suitable materials may be used . fig4 a shows one embodiment of a string 200 with markings in centimeters 205 , where the distance between every other centimeter is colored , so 0 - 1 cm is a first color 210 a , 1 - 2 cm is a second color 210 b , and so on , with the colors repeating . once the practitioner has withdrawn the reading apparatus 100 from the cervical opening , the practitioner then uses the section and / or color on the string 200 to determine the dilation measurement proximate the slidable attachment 130 . fig4 b shows another embodiment of a string 220 with markings in centimeters 205 , where every centimeter has a thick line 225 that is easy for the practitioner to read ( like a ruler ). once the practitioner has withdrawn the reading apparatus 100 from the cervical opening , the practitioner then uses the thick line 225 on the string 220 to determine the dilation measurement proximate the slidable attachment 130 . fig4 c shows one embodiment of a string 230 with markings in centimeters 205 , where the distance between every other centimeter has radiant color changes , so 0 - 1 cm is a first color 235 a , 1 - 2 cm is a second color 235 b , 2 - 3 is a third color 235 c , 3 - 4 is a fourth color 235 d , and so on with different colors . once the practitioner has withdrawn the reading apparatus 100 from the cervical opening , the practitioner then uses the color on the string 230 to determine the dilation measurement proximate the slidable attachment 130 . 1 . proper consent is obtained and the patient is appropriately prepared for a digital vaginal examination . 2 . practitioner puts the glove on in a sterile fashion . 3 . according to practitioner and patient preference , the practitioner may apply sterile lubricant to fingers to be used in the examination , for example , the pointer ( or 2nd finger ) and middle ( or 3rd finger ). this is optional and used routinely in obstetric practice to increase patient comfort with digital vaginal examination . lubricant has no effect on the device or measurement . 4 . practitioner inserts 2 nd and 3 rd fingers into the vaginal introitus . the practitioner finds the cervix and places the 2 nd finger stationary at the patient &# 39 ; s right side of the cervical os ( or left side if the practitioner is left - handed ). the practitioner extends the 3 rd finger to the opposite side of the cervical os , extending the string . care is taken not to stretch , distort or injure the cervix . throughout use , the retention mechanism , if present , retains the measuring device in close proximity to the rest of the device . 5 . the practitioner ensures that the measuring device is taught between the two fingers and then engages the locking mechanism , if one is present , while the measuring device is in the fully extended state equal to the diameter of the cervical opening . 6 . the practitioner now begins to remove his / her hand , allowing the two fingers to close to prevent patient discomfort . 7 . once the hand is removed , the practitioner carefully extends the 2 nd and 3 rd finger without further sliding at the locking mechanism . the practitioner can use the length of the measuring device between the two fingers to determine the diameter of the cervical os . 8 . the measurement of the cervical dilation is recorded . 9 . the glove / device is disposed of fig5 a is an overall view and fig5 b is a close - up view showing an embodiment of a cervical dilation reading apparatus 300 incorporating a measuring device 315 configured to provide accurate and reproducible readings of cervical dilation . in the embodiment shown , the cervical dilation reading apparatus 300 includes a first attachment band 306 that can be attached to a first finger 120 a and a second attachment band 307 that can be attached to a second finger 120 b . a measuring device 315 is coupled to the first and second attachment bands 306 , 307 spanning between the two fingers 120 a , 120 b . the measuring device 315 includes measurement markings and other features of similar measuring devices described above . the first and second attachment bands 306 , 307 may be used without a glove , or paired with a glove 110 . in other embodiments , the cervical dilation reading apparatus 300 may span more than two fingers , span non - adjacent fingers , or be incorporated into or attached to a sterile glove by other means . the measuring device 315 has a first portion 315 a fixedly coupled to the first attachment band 306 by a fixed attachment 325 , a second portion 315 b slidably coupled to the second attachment band 307 by a slidable attachment 330 , and a third portion 315 c beyond the slidable attachment 330 . the first attachment band 306 may be positioned on the first finger 120 a proximate a tip or end , and the second attachment band 307 may be positioned on the second finger 120 b proximate a tip or end . the first and second attachment bands 306 , 307 are designed to be held in place on the fingers by a force , such as friction , tension , adhesives , pressure , mechanical forces , or other mechanisms that will be apparent to one skilled in the art . the bands may be made of an elastic material , similar to a rubber band , silicone band , or plastic band , so that the attachment bands stretch and slide over the finger tips , but remain in place once the user positions them on the fingers . in other embodiments , the bands are made of an inelastic material , an adhesive material , or other materials that will be apparent to one skilled in the art . in other embodiments , the first attachment band 306 and second attachment band 307 may open at the end and wrap around the fingers , with the ends joined and secured with tape , velcro , tie , or other suitable attachment means . in other embodiments , the attachment bands 306 , 307 may be clips , tensile arcs , “ finger cots ”, partial gloves , glove fingers , or other configurations that can be attached to a finger that will be apparent to one skilled in the art . the measuring device 315 may move or change length as it is being withdrawn from the vagina after the dilation measurement , so some embodiments include a locking mechanism designed to allow the measuring device 315 to slide in direction 135 as the fingers are spread for dilation measurement and lock the measuring device 315 . in some embodiments , the locking mechanism may allow bidirectional movement when the user applies forces in either direction 135 or 140 while obtaining the cervical dilation measurement . the locking mechanism locks the slidable attachment in place when the user is not applying force to the device and prevents any sliding after dilation measurement is completed , such as shown in fig5 b . this locking action allows any practitioner to utilize the cervical dilation reading apparatus 300 and , once the measuring device 315 is locked in place , obtain the same measurement as any other practitioner would obtain with the same or similar device . the locking mechanism allows the cervical dilation reading apparatus 300 to be withdrawn without the measuring device 315 moving , thereby getting the most consistent results between practitioners and maximizing patient comfort and practicality . fig5 b shows one embodiment of the cervical dilation reading apparatus 300 with a measuring device 315 made of a string or other flexible material that has a fixed attachment 325 to the first attachment band 306 and a slidable attachment 330 to the second attachment band 307 . the measuring device 315 slides through the second attachment band 307 in a first direction 135 when the fingers 120 a , 120 b are separated . the user may apply force to the third portion of the measuring device 315 c to slide the measuring device 315 through the second attachment band 307 in the second direction 140 . once the measurement is obtained , forces between the second portion of the measuring device 315 b and the locking mechanism of the slidable attachment 330 prevent the measuring device 315 from sliding in either direction 135 or 140 , thereby locking the measuring device 315 in the extended state after obtaining the dilation measurement . forces between the measuring device 315 and the locking mechanism of the slidable attachment 330 may include tension , friction , compression , resistance , mechanical forces , spring forces , adhesives , or other forces that will be apparent to one skilled in the art . this will then lock the measuring device 315 in the correct length for the dilation measurement . fig5 c - 5e show some embodiment examples of a locking mechanism for use with a slidable attachment . fig5 c shows one embodiment of the cervical dilation reading apparatus 300 with a measuring device 315 having thin projections , collapsible arrows , or barbs 345 that compress or collapse as they go through the locking mechanism of the slidable attachment 330 in a first direction 135 when the fingers 120 a , 120 b are separated . the thin projections or collapsible arrows 345 then expand after going through the locking mechanism , preventing them from moving backward in a second direction 140 , thereby locking the measuring device 315 in the substantially extended state after measuring the dilation measurement . this will then lock the measuring device 315 in the correct length for the dilation measurement . fig5 d shows another embodiment of the cervical dilation reading apparatus 300 with a measuring device 315 having thin ridges 350 that “ pop through ” the locking mechanism of slidable attachment 330 in a first direction 135 as the fingers 120 a , 120 b are separated . once the ridges 350 “ pop through ” the locking mechanism , the measuring device 315 cannot move backward in a second direction 140 , thereby locking the measuring device 315 in the substantially extended state after measuring the dilation measurement . this will then lock the measuring device 315 in the correct length for the dilation measurement . fig5 e shows another embodiment of the cervical dilation reading apparatus 300 with a measuring device 355 that uses a cable tie or tie - wrap , also known as a hose tie , zap - strap , or zip tie with a ratcheting mechanism 360 for locking the measuring device 355 on the slidable attachment on the second attachment band 307 . the measuring device 355 slides in a first direction 135 as the fingers 120 a , 120 b are separated . once through the ratcheting mechanism 360 , the measuring device 355 can &# 39 ; t move backward in a second direction 140 , thereby locking the measuring device 355 in the substantially extended state after measuring the dilation measurement . this will then lock the measuring device 355 in the correct length for the dilation measurement . in use , the practitioner would insert the first finger 120 a and the second finger 120 b and the cervical dilation reading apparatus 300 with measuring device 315 into the cervical opening 30 . the practitioner would place the first finger 120 a on one side of the cervical opening 30 and then move the second finger 120 b toward the opposite side of the cervical opening . the first portion 315 a of the measuring device 315 is fixed to the first attachment band 306 which is coupled to the first finger 120 a and the second portion 315 b of the measuring device 315 slides through the slidable attachment 330 of the second attachment band 307 which is coupled to the second finger 120 b , thereby lengthening the measuring device 315 to obtain the correct dilation measurement . once to the other side , the practitioner would then withdraw the cervical device reading apparatus 300 , and read the dilation measurement from the second portion 315 b of the measuring device 315 . if during the cervical examination , the practitioner stretches the fingers 120 a , 120 b beyond the diameter of the cervical opening 30 , the practitioner may subsequently close the fingers 120 a , 120 b to place them on opposite sides of the cervical opening 30 . the practitioner may then apply force to the third portion of the measuring device 315 c to shorten the length of the measuring device between fingers 120 a and 120 b , resulting in a length between the first finger 120 a and the second finger 120 b equivalent to the diameter of the cervical opening 30 . the practitioner would then withdraw the cervical dilation reading apparatus 300 , and read the dilation measurement from the second portion 315 b of the measuring device 315 . similarly , the practitioner may extend the fingers 120 a , 120 b beyond the diameter of the cervical os 30 when donning the apparatus , when adjusting the apparatus on the fingers , when initiating the cervical examination , or during the cervical examination . if overextension occurs at any point , the practitioner may shorten the length of the measuring device 315 between the two bands 306 and 307 by pulling on the third portion of the measuring device 315 c . after obtaining the cervical dilation measurement , the practitioner may close his / her fingers 120 a , 120 b prior to removing his / her fingers 120 a , 120 b and the cervical dilation reading apparatus 300 from the vagina . the locking mechanism will hold the second portion 315 b of the measuring mechanism 315 in place , allowing the practitioner to read the correct cervical dilation measurement from the second portion 315 b of the measuring mechanism 315 . 1 . proper consent is obtained and the patient is appropriately prepared for a digital vaginal examination . 2 . practitioner positions the first attachment band on a first finger and the second attachment band on a second finger . 3 . according to practitioner and patient preference , the practitioner may apply lubricant to fingers to be used in the examination , for example , the pointer ( or 2nd finger ) and middle ( or 3rd finger ). this is optional and used routinely in obstetric practice to increase patient comfort with digital vaginal examination . lubricant has no effect on the device or measurement . 4 . practitioner inserts 2 nd and 3 rd fingers into the vaginal introitus . the practitioner finds the cervix and places the 2 nd finger stationary at one edge of the cervical os . the practitioner extends the 3 rd finger to the opposite side of the cervical os , extending the measuring device . care is taken not to stretch , distort or injure the cervix . if the practitioner stretches the fingers beyond the diameter of the cervical os , he / she can subsequently place the fingers on opposite sides of the cervical os and pull on the third portion of the measuring device to shorten the length of measuring device between the examining fingers so that it is equal to the diameter of the cervical os . 5 . the locking mechanism locks the measuring device in the extended state equal to the diameter of the cervical opening . 6 . the practitioner now begins to remove his / her hand , allowing the two fingers to close to prevent patient discomfort . 7 . once the hand is removed , the practitioner can use the length of the measuring device between the two fingers to determine the cervical dilation . 8 . the measurement of the cervical dilation is recorded . 9 . the first and second attachment band are removed from the fingers . the disclosed invention fills an important gap in practitioners &# 39 ; ability to accurately and precisely determine cervical dilation measurements during labor . it does not introduce any discomfort or risk beyond that of a routine digital vaginal examination . it fits into work flow on the labor floor without introduction of new machines or complicated technology that require advanced training . it allows for increased accuracy across all levels of training and experience . currently , no device or technology exists to fill this gap in practitioners &# 39 ; clinical ability / practice . no device of this nature has ever been described or introduced . as such , this device presents a novel and important addition to medicine . while embodiments and applications of this invention have been shown and described , it would be apparent to those skilled in the art that many more modifications than mentioned above are possible without departing from the inventive concepts herein . it is to be understood that the present disclosure is illustrative only and that changes , variations , substitutions , modifications and equivalents will be readily apparent to one skilled in the art and that such may be made without departing from the spirit of the invention as defined by the following claims .
a cervical dilation reading apparatus and method of use to accurately and precisely determine cervical dilation measurements during labor and delivery . the apparatus includes a measuring device having a length with a first portion , a second portion , and a third portion , a first attachment band configured to couple with a first finger , the first attachment band having a fixed attachment fixedly engaged with the first portion of the measuring device , and a second attachment band configured to couple with a second finger , the second attachment band having a slidable attachment slidably engaged with the second portion of the measuring device . the method includes providing a cervical dilation reading apparatus , coupling the first attachment band to a first finger and the second attachment band to a second finger , inserting the first and second fingers into the vaginal introitus and locating the cervix and cervical os , placing the first finger on a first side of the cervical os and extending the second finger away from the first finger to a second side , opposite the first side , of the cervical os , thereby extending the length of the measuring device between the first and second fingers to an extended state , ensuring that the measuring device length is equivalent to the distance between the first and second fingers by pulling on the third portion of the measuring device if neccesary , removing the first and second fingers , and determining a diameter of the cervical os by the length of the measuring device in the extended state between the fixed attachment and slidable attachment .