while the invention will be described in connection with several preferred embodiments , it will be understood that it is not intended to limit the invention to those embodiments . on the contrary , it is intended to cover all alternatives , modifications and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims . turning now to fig4 and 5 , a first module 50 is provided . according to one aspect of the present invention , the module 50 can be a sleeve 60 or sleeve module . the sleeve 60 is preferably made of titanium allow . however , other materials can be used without departing from the broad aspects of the present invention . the sleeve 60 has a first end 65 . the sleeve 60 has a clamp 66 on the exterior surface of the first end 65 and is threaded with threads 67 on the interior surface of the first end . opposed to the first end 65 is a second end 70 . the second end 70 is similar to the first end 65 , and comprises a clamp 71 in its exterior surface and is threaded with threads 72 on its interior surface . a body 75 exists between the first end 65 and the second end 70 . the sleeve 60 has an overall length gamma . an alternative embodiment of the first module is shown in fig4 a and 5a , and the alternative is shown with reference number 60 a . sleeve 60 a has a first end 65 a . the sleeve 60 a has a clamp 66 a on the exterior surface of the first end 65 a and is threaded with threads 67 a on the interior surface of the first end . opposed to the first end 65 a is a second end 70 a . the second end 70 a is similar to the first end 65 a , and comprises a clamp 71 a in its exterior surface and is threaded with threads 72 a on its interior surface . a body 75 a exists between the first end 65 a and the second end 70 a . the sleeve 60 a has an overall length gammaa . a further alternative embodiment of the first module is shown in fig4 b and 5b , and the alternative embodiment is shown with reference numeral 60 b . sleeve 60 b has a first end 65 b . the sleeve 60 b has a clamp 66 b on the exterior surface of the first end 65 b and is threaded with threads 67 b on the interior surface of the first end . opposed to the first end 65 b is a second end 70 b . the second end 70 b is similar to the first end 65 b , and comprises a clamp 71 b in its exterior surface and is threaded with threads 72 b on its interior surface . a body 75 b exists between the first end 65 b and the second end 70 b . the sleeve 60 b has an overall length gammab . a still further alternative embodiment of the first module is shown in fig4 c and 5c , and the alternative embodiment is shown with reference numeral 60 c . sleeve 60 c has a first end 65 c . the sleeve 60 c has a clamp 66 c on the exterior surface of the first end 65 c and is threaded with threads 67 c on the interior surface of the first end . opposed to the first end 65 c is a second end 70 c . the second end 70 c is similar to the first end 65 c , and comprises a clamp 71 c in its exterior surface and is threaded with threads 72 c on its interior surface . a body 75 c exists between the first end 65 c and the second end 70 c . the sleeve 60 c has an overall length gammac . even though four embodiments of the sleeve module 60 are described and shown , it is apparent that the present invention is not limited to those embodiments . rather , sleeve modules of other lengths are also considered to be within the scope of the present invention . turning now to fig6 and 7 , a second module 50 is provided . the second module is a spacer 80 or spacer module . the spacer is preferably made of titanium allow . however , it may be made from other materials without departing from the broad aspects of the present invention . the spacer 80 has a first end 85 . the first end 85 has an external surface 86 that is threaded with threads 87 . opposed to the first end 85 is a second end 90 . the second end 90 has an external surface 91 that is threaded with threads 92 . a body 95 is provided and is located between the first and second ends 85 and 90 , respectively . the body 95 has a length . the spacer 80 has an overall length epsilon . an alternative embodiment of the second module is shown in fig6 a and 7a , and the alternative embodiment is shown with reference numeral 80 a . spacer 80 a has a first end 85 a . the first end 85 a has an external surface 86 a that is threaded with threads 87 a . opposed to the first end 85 a is a second end 90 a . the second end 90 a has an external surface 91 a that is threaded with threads 92 a . a body 95 a is provided and is located between the first and second ends 85 a and 90 a , respectively . the body 95 a has a length . the spacer 80 a has an overall length epsilona . a further alternative embodiment of the second module is shown in fig6 b and 7b , and the alternative embodiment is shown with reference numeral 80 b . spacer 80 b has a first end 85 b . the first end 85 b has an external surface 86 b that is threaded with threads 87 b . opposed to the first end 85 b is a second end 90 b . the second end 90 b has an external surface 91 b that is threaded with threads 92 b . a body 95 b is provided and is located between the first and second ends 85 b and 90 b , respectively . the body 95 b has a length . the spacer 80 b has an overall length epsilonb . a still further alternative embodiment of the second module is shown in fig6 c and 7c , and the alternative embodiment is shown with reference numeral 80 c . spacer 80 c has a first end 85 c . the first end 85 c has an external surface 86 c that is threaded with threads 87 c . opposed to the first end 85 c is a second end 90 c . the second end 90 c has an external surface 91 c that is threaded with threads 92 c . a body 95 c is provided and is located between the first and second ends 85 c and 90 c , respectively . the body 95 c has a length . the spacer 80 c has an overall length epsilonc . a receiver adapter with externally threaded end 100 is provided , and is shown in fig8 and 9 . the receiver adapter 100 is preferably made of titanium allow . however , other materials can alternatively be used . the receiver adapter 100 has a receiver 101 at a first end . at the opposed end 103 is an external surface that is threaded with threads 104 . the receiver 101 is adapted to receive a conventional pyramidal object . the receiver 101 has four sides . each side has a threaded hole therethrough for receiving a screw . the screws can be selectively twisted into the respective holes to clamp onto a pyramidal object received within the receiver 101 . a receiver adapter with clamped end 110 is provided and is shown in fig1 and 11 . the receiver adapter 110 is preferably made of titanium allow . however , other material may alternatively be used . the receiver adapter 110 has a receiver 111 at a first end . at the opposed end 113 is a clamp 114 , which is located on the external surface of end 113 . the interior surface of the clamped end 113 is threaded with threads . the receiver 111 is adapted to receive a conventional pyramidal object . the receiver 111 has four sides . each side has a threaded hole therethrough for receiving a screw . the screws can be selectively twisted into the respective holes to clamp onto a pyramidal object that is received within the receiver 111 . turning now to fig1 and 13 , a pyramidal adapter with externally threaded end 120 is provided . the pyramidal adapter 120 is preferably made of titanium allow . however , other materials may alternatively be used . the pyramidal adapter 120 has a first end comprising a pyramid 121 . the pyramid 121 is preferably positioned centrally upon a dome 122 . opposed to the pyramid 121 is an externally threaded end 123 having threads 124 on the external surface . a further prosthetic component is shown in fig1 and 15 . in this regard , a pyramidal adapter with clamped end 130 is provided . the pyramidal adapter 130 is preferably made of titanium allow . however , other materials may alternatively be used . the pyramidal adapter 130 has a first end comprising a pyramid 131 . the pyramid 131 is preferably positioned centrally upon a dome 132 . opposed to the pyramid 131 is a clamped end 133 . the clamped end 133 comprises a clamp 134 on the external surface , and has an internal surface that is threaded with threads 135 . applicant notes that components 100 , 110 , 120 and 130 are provided for illustrative purposes , and the principles of the present invention may extend beyond these preferred embodiments . the components shown and described herein can be interchangeably and adjustably connected together to create a prosthetic limb having the desired length and orientation . several examples of how the components may be interchanged are provided . yet , it is understood that the present invention is not limited to those embodiments . one preferred set up comprising components of the present invention is shown in an exploded view in fig1 . as shown , a stump 7 with a conventional socket 10 is provided . a three prong adapter 30 having prongs 31 and an internally threaded end 32 and is adapted to be connected to the socket 10 in a conventional manner . a spacer module 80 is provided , and the first end 85 is positioned for being screwed into the internally threaded end 32 of the three prong adapter . further , a sleeve module 60 is provided such that the first end 65 can be screwed onto the second end 90 of the spacer module 80 . a receiver adapter with externally threaded end 100 is shown next , and is positioned such that the externally threaded end 103 can be threadably received within the second end 70 of the sleeve module 60 . the receiver 101 is then able to clamp onto a foot adapter 46 with a pyramidal end 47 . the foot adapter 46 , in turn is then connected to the foot 49 . it is shown that the bodies 75 and 90 of the sleeve module 60 and the spacer module 80 , respectively , are alignable upon a single axis that is generally parallel to a longitudinal axis of the prosthetic limb . these components , due to being threadably connected , are capable of being longitudinally adjusted relative to each other by twisting them in opposite directions about the single axis . fig1 shows a prosthetic limb comprising the components shown in fig1 . the components 30 , 80 , 60 and 100 are threadably connected to their respective adjacent components . upon a closer look , it is seen that spacer 80 is threaded all the way into the internally threaded end 32 of the three prong adapter 30 , such that the spacer and three prong adapter are fully engaged . likewise , the sleeve module 60 fully receives the opposite end of the spacer 80 . however , the threaded end of the receiver adapter 100 is not threaded completely into the sleeve . rather , the receiver adapter 100 is unthreaded approximately one revolution from the sleeve 60 . selectably threading and unthreading a component changes the overall length of the prosthetic component . in this preferred embodiment , the prosthetic limb has a selected effective length l 1 . turning now to one intended use of the preferred invention , it is noted that in fig1 , the effective length l 1 is the necessary length of the prosthetic limb such that the prosthetic limb will have a length equal to the natural limb . in this example , this fine tune adjustment was accomplished when the practitioner twisted the receiver adapter 100 one revolution out of full reception within the sleeve 60 . it is noted that one full revolution is provided for illustrative purposes only . in practice , the components can be twisted with respect to each other by any fraction or multiple of one revolution . principles of the present invention are further illustrated by way of comparison between fig1 and 18 . the prosthetic limbs shown in fig1 and 18 both comprise identical components . however , the effective length l 2 of the prosthetic limb shown in fig1 is longer than the effective length l 1 of the prosthetic limb shown in fig1 . this change if effective length is caused by selectably twisting the components out of full engagement with selected adjactent components . in particular , the first end of the spacer 80 is unthreaded approximately two revolutions out of full engagement with the three prong adapter 30 . further , the second end of the spacer 60 is unthreaded approximately one revolution out of the sleeve 80 . this method of adjustment of the effective length of the prosthetic limb is useful when the overall required adjustment is relatively small . further , in accordance with the principles of the present invention , is the ability to swap modules 50 of one size with modules of a different size . such principles are apparent upon comparison of fig1 and 19 . one structural difference between the prosthetic limbs shown in the two figures is that the spacer 80 shown in fig1 is replaced with spacer 80 a in fig1 . given that spacer 80 a has a longer length epsilon a than spacer 80 having length epsilon , it is shown that the effective length l 3 of the prosthetic limb shown in fig1 is greater than the effective length l 2 of the prosthetic limb shown in fig1 . yet , no customizing of individual components is necessary to accomplish this change . further , this change is accomplished merely by swapping a single component with another component . the effective length l 3 of the prosthetic limb shown in fig1 can be fine tuned be twisting some components as necessary either further into or out of their respective adjacent components . fig2 further demonstrates the flexibility of the present invention . fig2 is similar to fig1 , but the sleeve module 60 has been replaced with larger sleeve module 60 a . the effective length l 4 of the prosthetic limb is increased replacing the first sleeve module 60 with the larger sleeve module 60 a . hence , it is apparent that the prosthetic limb can interchangeably be made longer as a person grows . applicant notes that the overall effective length of the prosthetic limb can continue to increase if sleeves 60 b or 60 c and spacers 80 b and 80 c are interchanged for sleeve 60 or 60 a and spacer 80 or 80 a , respectively . it is noted that the practitioner can achieve the opposite effect by replacing a longer component with a relatively smaller like kind component . fig2 - 23 further exemplify the principles of the present invention . in fig2 , a three prong adapter 30 is shown for connecting to the socket 10 . a receiver adapter with an externally threaded end 100 is provided for connecting to the three prong adapter 30 . next , a pyramidal adapter with an externally threaded end 120 is provided for being angularly adjustably connected to the receiver adapter 120 . a sleeve module 60 is provided for connecting to the pyramidal adapter 120 . a spacer module 80 is provided for being connected to the sleeve module 60 . a receiver adapter with externally threaded end 110 is also provided . the receiver adapter 110 can be connected to a foot adapter 46 , which in turn is connectable to a prosthetic foot 49 . the receiver adapter 100 and the pyramidal adapter 120 can be angularly adjustably connected to each other . further , given that these components are threadably connected to their adjacent components , the receiver adapter 100 and the pyramidal adapter 120 can be connected into any rotational alignment with respect to those adjacent components . fig2 shows yet another prosthetic limb configuration employing the principles of the present invention . in this preferred embodiment , the components are in the following configuration : a three prong adapter 30 connectable to a receiver adapter with an externally threaded end 100 , which is connectable to a pyramidal adapter with clamped end 130 , which is connectable to a spacer module 80 , which is connectable to a spacer module 60 , which is connectable to a receiver adapter with an externally threaded end 100 , which is connectable to a foot adapter 46 that is connected to a prosthetic foot 49 . still another preferred embodiment is shown in fig2 . in this figure , the prosthetic limb has the following configuration : a three prong adapter 35 with external threads 37 , the three prong adapter 35 being connectable to a relatively large sleeve module 60 c , which is connectable to a receiver adapter with externally threaded end 100 , which is connectable to a foot adapter 46 that is connected to a foot . fig2 illustrates the ability to construct a fully adjustable and fine tunable prosthetic limb with only a limited number of components . it is apparent that the number of possible configurations embodying the principles of the present invention is numerous , and that it is impractical to show in detail all of the numerous possible configurations . rather , several preferred embodiments have been provided and serve as to demonstrate the principles of the present invention . turning now to the setup and use of the present invention , it is noted that the modules 50 of the present invention are capable of being used with other prosthetic components not shown herein . for example , angular and offset alignment devices presently exist , and can readily be incorporated into a system comprising the principles of the present invention . in order to construct a prosthetic limb , the practitioner will first need to observe the socket 10 in order to determine the shape and orientation of the end 12 of the socket . in some cases , the prosthetic limb will need to incorporate angular and / or offset alignment devices . if so , the proper devices will be selected first . next , a means for connecting the prosthetic limb to the socket 10 will be selected and the prosthetic foot 49 will be selected . given that the practitioner knows the overall effective length required , and given that the practitioner knows the length of the selected components , the practitioner will be able to estimate the necessary length of the remaining components yet to be selected . the practitioner then can select modules 50 as necessary to interconnect with the previously selected components . next , the practitioner assembles the selected components . if the effective length of the assembled prosthetic limb is not close to the length of the natural limb , the modules 50 can be swapped with modules of a more appropriate length . after the practitioner determines and incorporates the properly sized components , the practitioner then fine tunes the effective length of the prosthetic limb by selectably twisting the components towards or away from full engagement with the respective adjacent components . the clamps can then be tightened to lock the prosthetic components in place . it is noted that offset alignment devices and angled alignment devices may need to be in a particular rotational orientation relative to a longitudinal axis of the prosthetic limb . due to the rotational and threaded connectivity of the components provided , such a situation is not an obstacle . rather , any offset alignment devices and angled alignment devices that are incorporated into the prosthetic limb are simply rotated or twisted with respect to their adjacent components until the desired rotational orientation is achieved . the effective length of the prosthetic limb can be easily modified by simply loosening a clamp , and then either threading a first component either further towards or away from full engagement with its adjacent component , as appropriate . yet , at some point , the required adjustment will exceed the adjustment capabilities provided by twisting the components relative to each other . in this case , a module 50 of a first size can be easily swapped with a module of a second size to obtain the proper effective length of the prosthetic limb . it is noted that the modular aspects of the present invention allows the practitioner to make a custom fit prosthetic limb without the need for individually made custom components . thus it is apparent that there has been provided , in accordance with the invention , modular prosthetic limb components that fully satisfy the objects , aims and advantages as set forth above . while the invention has been described in conjunction with specific embodiments thereof , it is evident that many alternatives , modifications , and variations will be apparent to those skilled in the art in light of the foregoing description . accordingly , it is intended to embrace all such alternatives , modifications , and variations as fall within the spirit and broad scope of the appended claims .
the present invention relates to a system with modular components for forming a prosthetic limb , wherein the effective length of the limb is adjustable to accommodate changing needs of a particular person . several modular components are provided , including sleeve and spacer modules . each sleeve module has a body with a selected length and has two opposed ends that are internally threaded . each spacer module has a body of a selected length and has two opposed ends that are externally threaded . the modules are usable with existing prosthetic components have respective mating ends . the modules are twistable with respect to each other , which enables the effective length of the prosthetic limb to be adjusted . further , the modules can be interchanged with modules having a different length , which enables large adjustment capabilities . a fully custom fitted prosthetic limb is therefore achievable without the need to custom make a single component .