the invention will now be described with reference to the drawing figures , in which like reference numerals refer to like parts throughout . an embodiment in accordance with the present invention provides a device for counting objects that may be delivered by a multi - delivery device . for example , and automatic clip applier such as the one shown and described in u . s . patent application ser . no . 13 / 618 , 215 filed sep . 14 , 2012 , titled “ automatic surgical ligation clip applier ” incorporated herein by reference in its entirety may deliver a ligation clip upon actuation of the trigger device such as the one shown and described herein may be attached to the automatic clip applier and keep track of how many clips have been applied . an embodiment of the present inventive apparatus is illustrated in fig1 . fig1 illustrates a counter 10 . the counter 10 includes a counter housing 12 . a counter wheel 14 is mounted onto the counter housing 12 . the counter wheel 14 includes a counter wheel window 16 . the counter wheel 16 may rotate and display indicia 18 that is located on a fixed disk 17 . when the counter wheel 14 rotates , the counter wheel window 16 will also rotate thereby selectively covering and uncovering indicia 18 located on the fixed disk 17 . the counter wheel 14 and the fixed disk 17 both are supported on the wheel shaft 20 . while the fixed disk 17 does not rotate about the wheel shaft 20 , in some embodiments the counter wheel 14 does rotate . in other embodiments it may be the disk 17 that rotates and the counter wheel 14 that remains fixed . the counter wheel 14 attaches to the counter housing 12 by the wheel shaft 20 extending through the hole 22 in the counter wheel 14 . the wheel shaft 20 attaches to the counter housing 12 of the of the shaft mounting 24 the shaft mounting 24 may be connected to reinforcing fins 25 which are also attached to the counter housing 12 . the counter wheel 14 may be rotated by operation of the actuator wheel 26 teeth 28 interacting with the counter wheel actuation structure 30 . as the actuator wheel 26 rotates , it causes the teeth 28 on the actuator wheel 26 to rotate and mesh with the counter wheel actuation structure 30 causing the wheel actuation structure 30 and counter wheel 14 to rotate . more discussion of the rotation the counter wheel 26 will be made in the description with respect to fig2 . at the other end of the counter housing 12 , the counter striker 32 is illustrated . the counter striker 32 is what the attaching structure 34 is connected to . the attaching structure 34 is used for attaching the counter 10 onto an instrument such as , for example , an automatic applier for counting items dispensed by the applier . the attaching mechanism 34 includes holes 36 and the slot 35 . turning now to fig2 , an exploded view of the counter 10 is shown . the housing 12 includes the shaft mounting 24 to which the shaft 20 is mounted . the housing 12 defines a hole 37 . within the hole 37 , cam teeth 38 are located . the cam teeth 38 include a sloped portion 40 and a vertical portion 42 . the counter striker 32 is shown outside of the hole 37 , but normally resides in the hole 37 . the cam teeth 38 are configured to interact with the cam teeth 44 . the cam teeth 44 include a slanted edge 46 . the cam teeth 44 located on the counter wheel hub 48 . normally , both the counter striker 32 and the counter wheel hub 48 are located in the hole 37 in the counter housing 12 . the counter striker 32 includes stopping structure 50 which fit into slots in the hole 37 ( not shown ) to limit the rotation of the striker 32 in the housing 12 and to prevent the counter striker 32 from moving all the way through the hole 37 in the counter housing 12 . the counter striker 32 also has a set of cam teeth 52 . the cam teeth 52 and have high points 54 and low points 56 as well as a sloped area 58 located between the high points 54 and the low points 56 . the cam teeth 52 are generally v - shaped . the cam teeth 52 on the striker 32 are located at a lower diameter that the teeth 38 in the housing 12 . the counter wheel hub 48 has the actuator wheel 26 attached . the actuator wheel 26 includes actuator teeth 28 which are configured to interact with the counter wheel actuation structure 30 located on the counter wheel 14 . the counter wheel hub 48 and actuator wheel 26 include holes 60 , 64 . the spring 66 extends through the hole 64 in the counter wheel hub 48 . while the shaft portion 62 of the wheel hub 48 extends into the hole 60 in the counter striker 32 . the spring 66 is capped with a spring cap 68 that when the counter 10 is assembled , urges against the counter wheel 14 . as shown in fig1 and 2 , the counter wheel 14 includes a window 16 to uncover indicia 18 . the counter wheel 14 also includes a hole 22 to allow the counter wheel 14 to be mounted onto the wheel shaft 20 . the counter wheel actuation structure 30 can barely be seen in fig2 and is better shown in fig1 . one of ordinary skill in the art will appreciate that additional counter wheel actuation structure 30 is present on the back of the counter wheel 14 than what can be seen in the figures . the hole 64 in the wheel hub 48 is not a through hole . thus , when assembled , the spring 66 is compressed between a floor in the hole 64 and the spring cap 68 . as a result , the wheel hub 48 is biased axially toward the cam teeth 38 . the spring cap 68 provides a smooth surface against the counter wheel 14 to limit friction force from the spring 66 which could otherwise impede the rotation of the counter wheel 14 . the cam teeth 52 on the striker 32 are located at a lower diameter that the teeth 38 in the housing 12 . the cam teeth 52 on the striker 32 are offset from the cam teeth 38 in the housing 12 . when assembled , the wheel hub 32 is centered in the housing 12 by cam teeth 44 . the cam teeth 44 communicate with cam teeth 38 of the housing 12 and the cam teeth 52 of the striker 32 . the counter 10 is actuated by the axial movement of the striker 32 against the wheel hub 48 . this axial movement of the striker 32 is the input into the counter 10 from an external device such as an automatic clip applier . actuation of the clip applier results in the axial movement of the striker 32 against the wheel hub 48 . when the wheel hub 48 moves axially toward the counter wheel 14 , the cam teeth 44 on the wheel hub 48 disengage from the cam teeth 38 in the housing 12 . due to the urging of the spring 66 against the wheel hub 48 , the slanted edge 46 of the cam teeth slide along the sloped area 58 of the cam teeth 52 until the cam teeth 44 come to a stop in the low point 56 of the cam teeth 52 . this cases partial rotation of the wheel hub 48 . when input to the counter 10 subsides , the spring 66 causes the striker 32 to return axially into the housing 12 . the cam teeth 44 reengage the cam teeth 32 . however , now the cam teeth 38 and 44 are misaligned . the force of the spring 66 will cause the slanted edge 46 of the cam teeth 44 to slide along the sloped portion 40 of the cam teeth 38 until the cam teeth 44 encounter and are stopped by the vertical portion 42 of the cam teeth 38 . this sliding action causes the wheel hub 48 to rotate . due to the interaction between actuator wheel teeth 28 and the counter wheel actuation structure 30 , when the wheel hub 48 rotates , the counter wheel 14 will also rotate . as described above , the counter wheel 14 will rotate as a result of axial movement of the striker 32 in both the axial directions ( toward and away from the housing 12 ). in some embodiments , when the striker 32 moves axially way from the housing 12 , the counter wheel 14 will move half way to indicate a count and when the striker 32 returns toward the housing 12 , the counter wheel 14 will move the rest of the way to indicate a count . after reading this disclosure , one of ordinary skill in the art will understand how to select the pitch , dimensions for the teeth 28 , 38 , 44 , and 52 , the slanted edge 46 , the sloped portions 40 and 58 , and teeth ( or gear ) ratios to achieve a desired amount of rotation of the wheel hub 48 . the total number of objects that can be counted is related to the size and number of gear mesh and cam meshes . as mentioned above , these can be varied to allow for different counter configurations . the counter mechanism can be varied and customized to allow for different counts . the indicia 18 on the counter wheel 14 may also be varied or customized . for example , the indicia 18 may include , colors , symbols , characters such as numbers , letters , roman numerals , or any other desired indicia . the many features and advantages of the invention are apparent from the detailed specification , and thus , it is intended by the appended claims to cover all such features and advantages of the invention which fall within the true spirit and scope of the invention . further , since numerous modifications and variations will readily occur to those skilled in the art , it is not desired to limit the invention to the exact construction and operation illustrated and described , and accordingly , all suitable modifications and equivalents may be resorted to , falling within the scope of the invention .
a counter mechanism includes : a counter housing including a shaft and a hole ; a first set of cam teeth located in the hole ; a striker located in the hole and configured to move axially with respect to the hole having a second set of cam teeth ; a counter wheel hub having a third set of cam teeth configured to communicate with both the first and second set of cam teeth , the counter wheel hub also having an actuator ; and a counter wheel having an actuation feature configured to communicate with the actuator to cause the counter wheel to rotate when the counter wheel hub rotates . a method for counting dispensed items may also be described .