Adjustable Clavicle Hook Plate Measuring Gauge

Abstract

A new and innovative medical sizing instrument and method for determining the appropriate depth and / or length of a clavicle hook plate for a patient is provided. The provided medical sizing instrument can enable a surgeon to determine the appropriate hook depth without having to switch between different components, such as a series of templates. In one example, a surgeon can insert the medical sizing instrument into a patient in the same manner as inserting a clavicle hook plate, adjust the hook depth on the medical sizing instrument, and read the indicated depth on the medical sizing instrument until a hook depth is obtained that properly maintains the anatomical alignment of the patient's clavicle and acromion. The surgeon can then remove the medical sizing instrument from the patient and select and insert the appropriate clavicle hook plate into the patient.

Description

[Technical field]

[0001] Claiming priority This application claims priority to and the benefit of U.S. Provisional Application No. 63 / 006,991, filed April 8, 2020, which is incorporated by reference in its entirety.

[0002] This application relates generally to the treatment of distal clavicle fractures and acromioclavicular joint disruptions. More specifically, this application provides a new and innovative medical sizing instrument and method for determining the desired depth and / or length of a clavicle hook plate to be used to treat a patient's distal clavicle fracture or acromioclavicular joint disruption. [Background technology]

[0003] A clavicle hook plate may be used to treat distal clavicle fractures and acromioclavicular joint disruptions. The surgeon may make an incision in the patient's shoulder and expose the patient's clavicle and acromioclavicular joint. In the case of a distal clavicle fracture, this may include exposing the outermost part of the clavicle, the fracture site, and the acromioclavicular joint. In the case of an acromioclavicular joint disruption, this may include exposing the acromioclavicular joint and the lateral shaft of the clavicle. The surgeon may then secure the plate portion of the clavicle hook plate to the patient's clavicle while the hook portion is in contact with the underside of the patient's acromion. The clavicle hook plate, acting as a lever, maintains the anatomical alignment of the patient's clavicle and acromion, thus allowing the patient's fracture and / or joint disruption to heal properly. Once sufficient healing has occurred, the surgeon may remove the clavicle hook plate.

[0004] When a surgeon treats a patient's distal clavicle fracture and / or acromioclavicular joint disruption with a clavicle hook plate, the surgeon must use a clavicle hook plate of an appropriate size for the patient. For example, the anatomy of a patient's shoulder varies between patients of different heights, ages, genders, or for various genetic reasons. Thus, for a clavicle hook plate to properly act as a lever to maintain the anatomical alignment of a given patient's clavicle and acromion, the appropriate length of the plate portion of the clavicle hook plate may vary between patients so that the plate portion can be secured to a sufficient amount of the patient's clavicle. In addition, the appropriate depth of the hook portion of the clavicle hook plate may vary between patients so that the hook portion can contact the underside of the patient's acromion while the plate portion is secured to the patient's clavicle.

[0005] Therefore, clavicle hook plates are often provided in multiple sizes with different plate portion lengths and hook portion depths. For example, a set of clavicle hook plates may include 12 different sizes with four different plate portion lengths and three different hook portion depths. In addition, clavicle hook plates are provided specifically on the patient's right side and also on the patient's left side, since the clavicle hook plates are contoured to the shape of the patient's clavicle. As part of the clavicle hook plate implant process, the surgeon must determine the appropriate size clavicle hook plate for each side of the patient after the surgeon makes an incision in the patient's shoulder to expose the patient's clavicle and acromioclavicular joint.

[0006] One way for a surgeon to determine the appropriate size clavicle hook plate for a patient is to use a series of hook plate templates. Templates are often provided at each available hook depth of the shortest plate length in a set of clavicle hook plates. For example, if a set provides three different hook depths, the series of templates would include three right-sided templates and three left-sided templates, one for each hook depth. Thus, the more depths provided, the more templates there are. Templates can often be used with separate components to determine if the plate length should be longer than the template length.

[0007] To determine proper sizing, the surgeon can select and place a first template on the patient and evaluate whether the size adequately maintains the anatomical alignment of the patient's clavicle and acromion. Placing the template on the patient can include provisionally fixing the template to the patient using instruments such as k-wires, plate tacks, and clamps. If the size is not correct, the surgeon can remove the first template and select and place a second template on the patient and evaluate whether the size adequately maintains the anatomical alignment. The second template may also be provisionally fixed in place.

[0008] The process of switching templates continues until the surgeon selects the template that he or she believes best maintains the anatomical alignment of the clavicle and acromion. The more templates there are, the more switching the surgeon may need to do. In some cases, the patient's anatomy may ideally require a hook depth between the depths offered in a set of clavicle hook plates, and thus the surgeon may need to switch back and forth between the two templates one or more times to determine which template best maintains the anatomical alignment. In addition, each time the surgeon needs to switch templates may involve removing the provisional from one template and then reapplying the provisional to the new template. Thus, using a series of templates to determine the appropriate clavicle hook plate sizing can be time-consuming and tedious for the surgeon. Summary of the Invention

[0009] The present application provides a new and innovative medical sizing instrument and method for determining implant sizing of a clavicle hook plate. The medical sizing instrument and method provide a quicker and easier approach for surgeons to determine the proper sizing of a clavicle hook plate compared to traditional approaches such as testing a series of templates. For example, a surgeon can determine the proper hook depth, and in some instances plate length, by inserting the provided medical sizing instrument once and adjusting the hook depth. Thus, the surgeon saves time by not having to switch and test multiple templates.

[0010] In light of the technical features described herein, in a first aspect of the disclosure of the present application, which may be combined with any other aspect unless otherwise specified, but is not limited to, a medical sizing instrument for a clavicle hook plate includes a tower, a contour plate, a hook, and a handle. The tower includes an opening extending from an upper end of the tower to a lower end of the tower. The contour plate extends from the tower and is shaped to match the contour and shape of a clavicle plate implant to be secured to a patient's clavicle. The hook includes a first portion at an angle to a second portion, the second portion being positioned through the opening in the tower. The handle can be engaged to adjust the distance between the first portion of the hook and the lower end of the tower.

[0011] In a second aspect of the disclosure of the present application, which may be combined with any other aspect unless otherwise specified, engaging the handle includes rotating the handle to adjust a distance between a first portion of the hook and a lower end of the tower.

[0012] In a third aspect of the present disclosure, which may be combined with any other aspect unless otherwise specified, the second portion of the hook includes an external thread and the handle includes an internal thread, the internal thread of the handle engaging the external thread of the hook when the handle is engaged, thereby adjusting the distance between the first portion of the hook and the lower end of the tower.

[0013] In a fourth aspect of the present disclosure, which may be combined with any other aspect unless otherwise specified, the handle is removably or permanently secured to the tower.

[0014] In a fifth aspect of the present disclosure, which may be combined with any other aspect unless otherwise specified, the second portion of the hook includes a handle.

[0015] In a sixth aspect of the disclosure of the present application, which may be combined with any other aspect unless otherwise specified, the second portion of the hook and the tower are configured such that engaging the handle includes translating the handle toward or away from the top end of the tower to adjust the distance between the first portion of the hook and the bottom end of the tower.

[0016] In a seventh aspect of the present disclosure, which may be combined with any other aspect unless otherwise specified, a tower includes upper and lower components configured such that the distance between the upper and lower components can be adjusted via a spring-loaded stepped locking mechanism. In this aspect, the upper component is a handle.

[0017] In an eighth aspect of the present disclosure, which may be combined with any other aspect unless otherwise specified, the contour plate is integrally connected to the tower.

[0018] In a ninth aspect of the present disclosure, which may be combined with any other aspect unless otherwise specified, a first portion of the hook extends from a second portion in a first direction relative to the tower, and the contour plate extends from the tower in a second direction, the first direction being substantially opposite to the second direction.

[0019] In a tenth aspect of the present disclosure, which may be combined with any other aspect unless otherwise specified, the tower further includes a window and a plurality of markings adjacent to the window, and the second portion of the hook includes an indicator marking, the indicator marking being visible through the window when a distance between the first portion of the hook and a lower end of the tower is adjusted.

[0020] In an eleventh aspect of the disclosure of the present application, which may be combined with any other aspect unless otherwise specified, the second portion of the hook and the opening in the tower are configured such that the second portion of the hook can be positioned through the opening in the tower in only a single orientation.

[0021] In a twelfth aspect of the disclosure of the present application, which may be combined with any other aspect unless otherwise specified, the medical sizing instrument further includes a member pivotally or slidably coupled to the contour plate such that the member can be deployed to extend the measuring length of the contour plate.

[0022] In a thirteenth aspect of the present disclosure, which may be combined with any other aspect unless otherwise specified, the medical sizing instrument is configured such that the hook can be temporarily locked in distinct positions when the handle is engaged to adjust the distance between the first end of the hook and the lower end of the tower, each distinct position corresponding to a distinct distance between the first end of the hook and the lower end of the tower.

[0023] In a fourteenth aspect of the disclosure of the present application, which may be combined with any other aspect unless otherwise specified, a method for determining a desired size of a clavicle hook plate includes inserting a medical sizing instrument into a patient through an incision in the patient's shoulder. The medical sizing instrument may be the medical sizing instrument of the first aspect or may be combined with any other aspect. The method then includes adjusting a distance between a first portion of the hook and a lower end of the tower. A desired distance between the first portion of the hook and the lower end of the tower is then determined. A clavicle implant can then be selected based on the determined desired distance between the first portion of the hook and the lower end of the tower.

[0024] In a fifteenth aspect of the disclosure of the present application, which may be combined with any other aspect unless otherwise specified, determining a desired distance between a first portion of the hook and a lower end of the tower includes determining a distance between the first portion of the hook and the lower end of the tower that allows the first portion of the hook to contact the patient's acromion and that allows the contour plate to contact the patient's clavicle.

[0025] In a sixteenth aspect of the disclosure of the present application, which may be combined with any other aspect unless otherwise specified, the medical sizing instrument includes a plurality of markings on the tower and an indicator marking on the second portion of the hook, and determining a desired distance between the first portion of the hook and a lower end of the tower further includes identifying an indicated depth based on the indicator marking relative to the plurality of markings once the desired distance is determined.

[0026] In a seventeenth aspect of the disclosure of the present application, which may be combined with any other aspect unless otherwise specified, a desired distance between the first portion of the hook and the lower end of the tower provides proper reduction of the patient's clavicle.

[0027] In an eighteenth aspect of the disclosure of the present application, which may be combined with any other aspect unless otherwise specified, the method further includes releasably securing the medical sizing device to the patient after inserting the medical sizing device and before adjusting the distance between the first portion of the hook and the lower end of the tower.

[0028] In a nineteenth aspect of the disclosure of the present application, which may be combined with any other aspect unless otherwise specified, the method further includes removing the medical sizing device from the patient before adjusting the distance between the first portion of the hook and the lower end of the tower. The distance between the first portion of the hook and the lower end of the tower is adjusted after removing the medical sizing device from the patient. The medical sizing device with the adjusted distance between the first portion of the hook and the lower end of the tower can then be reinserted into the patient.

[0029] In a twentieth aspect of the disclosure of the present application, which may be combined with any other aspect unless otherwise specified, the contour plate extends a length from the tower, the medical sizing instrument further includes a member configured to extend the length of the contour plate, and the method further includes positioning the member and determining a desired length of the clavicle implant based on the member. The clavicle implant is selected based on the determined desired length of the clavicle implant and the determined desired distance between the first portion of the hook and the lower end of the tower.

[0030] Additional features and advantages of the disclosed method and apparatus will be described in and will be apparent from the following detailed description and figures. The features and advantages described herein are not all-inclusive, and in particular many additional features and advantages will be apparent to those skilled in the art in view of the figures and description. Furthermore, it should be noted that the language used herein has been chosen primarily for ease of reading and explanatory purposes, and not to limit the scope of the inventive subject matter. [Brief description of the drawings]

[0031] [Figure 1] FIG. 1 is a perspective view of an exemplary medical sizing instrument according to one aspect of the present disclosure. [Figure 2A] 2 illustrates an exemplary base portion of the medical sizing instrument of FIG. 1 according to one embodiment of the present disclosure. [Figure 2B] 2 illustrates an exemplary handle of the medical sizing instrument of FIG. 1 according to one embodiment of the present disclosure. [Figure 2C] 2 illustrates an exemplary hook of the medical sizing device of FIG. 1 according to one embodiment of the present disclosure. [Figure 2D] FIG. 1 is a perspective view of an exemplary medical sizing instrument including a sliding hook, according to one aspect of the present disclosure. [Figure 2E] FIG. 1 is a perspective view of an exemplary medical sizing instrument including a sliding hook, according to one aspect of the present disclosure. [Figure 3A]FIG. 1 is a perspective view of an exemplary medical sizing instrument including a ball plunger / detent position locking mechanism according to one aspect of the present disclosure. [Figure 3B] FIG. 3B is a cross-sectional view of the exemplary ball plunger / detent position locking mechanism shown in FIG. 3A. [Figure 3C] FIG. 1 is a perspective view of an exemplary medical sizing instrument including a spring-loaded pin position locking mechanism according to one aspect of the present disclosure. [Figure 3D] FIG. 3D is a cross-sectional view of the exemplary spring loaded pin position locking mechanism shown in FIG. 3C. [Figure 3E] FIG. 1 is a side view of an exemplary medical sizing instrument including a spring-loaded stepped tower position locking mechanism, according to one aspect of the present disclosure. [Figure 4A] FIG. 1 illustrates a perspective view of an exemplary medical sizing instrument including a hinged, extendable member for length measurement, according to one aspect of the present disclosure. [Figure 4B] FIG. 1 is an exploded perspective view of an exemplary medical sizing instrument including an add-on ruler for length measurements, according to one aspect of the present disclosure. [Figure 4C] 1 is a perspective view of an exemplary medical sizing instrument including a sliding member for length measurement, according to one aspect of the present disclosure. FIG. [Figure 4D] 1 is a perspective view of an exemplary medical sizing instrument including a sliding member for length measurement, according to one aspect of the present disclosure. FIG. [Figure 4E] FIG. 1 is an exploded perspective view of an exemplary medical sizing instrument including an indexing ruler for length measurements, according to one aspect of the present disclosure. [Diagram 5] 1 is a flow chart of an exemplary method for determining the appropriate depth of a clavicle hook plate for a patient, according to one aspect of the present disclosure. [Figure 6] 1A-1C illustrate an exemplary medical sizing instrument inserted into a patient to determine appropriate hook depth, according to one aspect of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] The present application provides a new and innovative medical sizing instrument and method for determining the appropriate depth of a clavicle hook plate for a patient. In some examples, the medical sizing instrument provided can also include an extendable member for determining the appropriate length of the clavicle hook plate for a patient. The medical sizing instrument provided can allow the surgeon to determine the appropriate hook depth without having to switch between different components such as a series of templates. For example, the medical sizing instrument provided can include a handle that adjusts the hook depth when engaged. Thus, the surgeon can place the medical sizing instrument on the patient in the same manner as placing the clavicle hook plate, and adjust the hook depth on the medical sizing instrument until a hook depth is obtained that properly maintains the anatomical alignment of the patient's clavicle and acromion. The surgeon can then read the indicated depth on the medical sizing instrument, remove the medical sizing instrument from the patient, and select and insert the appropriate clavicle hook plate into the patient.

[0033] Thus, the medical sizing instruments and methods of the present disclosure provide a quicker and easier approach for surgeons to determine the proper sizing of a clavicle hook plate compared to conventional approaches such as testing a series of templates. For example, a surgeon can determine the proper hook depth, and in some instances plate length, by inserting the provided medical sizing instrument once and adjusting the hook depth. Thus, the surgeon saves time by not having to switch and test multiple templates, which may also include removing and reinserting the fixation instrument, as described above. Given the number of surgical procedures that surgeons perform each day, the time saved for each operation can increase the number of procedures that a surgeon can perform in a day. The provided methods can also be easier for surgeons to perform and therefore more accurate, compared to switching between multiple templates. The provided medical sizing instruments and methods can also reduce the amount of items required in the operating room, thus increasing the efficiency of operating room organization and medical procedures.

[0034] In some cases, the medical sizing instruments and methods of the present disclosure can provide additional information to the surgeon beyond what conventional devices and methods provide. For example, the medical sizing instruments provided allow the surgeon to determine the ideal hook depth that the surgeon believes will best maintain the anatomical alignment of the patient's clavicle and acromion. In some cases, the ideal hook depth may be between the hook depths provided by the clavicle hook plate system the surgeon is using, and thus a clavicle hook plate with the ideal hook depth may not be available. Nonetheless, additional information regarding what the ideal hook depth is may help the surgeon better determine which available clavicle hook plate to use for the patient.

[0035] FIG. 1 illustrates a perspective view of an exemplary medical sizing instrument 100 according to one embodiment of the present disclosure. The exemplary medical sizing instrument 100 includes a contour plate 110, a tower 120, a handle 130, and a hook 140. In some embodiments, the contour plate 110 is shaped to match the contour and shape of an implant to be secured to a patient's right clavicle. In other embodiments, the contour plate 110 is shaped to match the contour and shape of an implant to be secured to a patient's left clavicle. In some examples, the contour plate 110 may be integrally connected to the tower 120 such that they are one base component. In other examples, the contour plate 110 may be removable from the tower 120. In such other examples, removing the contour plate 110 from the tower 120 may allow for the use of the same tower 120 having both a contour plate 110 contoured for a patient's right side and a contour plate 110 contoured for a patient's left side. In some examples, the handle 130 may be integrally connected to the tower 120. In other examples, the handle 130 may be removably secured to the tower 120 by one or more notches 212, 214 (FIG. 2), or the like.

[0036] In this example, the hook 140 includes a first portion 142 and a second portion (not shown) integrally formed with each other at a curved portion. As described in more detail below in connection with FIGS. 2A, 2B, and 2C, the second portion of the hook 140 is placed through an opening in the tower 120 and removably secured to the handle 130. For example, the handle 130 may be secured by a threaded portion on the exterior of the second portion of the hook 140 and on the interior of the handle 130. In such a case, when the handle 130 is rotated, such as in the direction of the arrow 102, the interaction between the threaded portion and the handle 130, which is integrally or removably secured to the tower 120, translates the hook 140 in one of the directions of the double arrow 104. For example, when the handle 130 is rotated in a clockwise direction, this may cause the first portion 142 of the hook 140 to move upward toward the bottom end of the tower. And when the handle 130 is rotated in a counterclockwise direction, this may cause the first portion 142 of the hook 140 to move downward away from the bottom end of the tower.

[0037] 2A, 2B, and 2C show exploded views of an exemplary medical sizing instrument 100 according to one embodiment of the present disclosure. Specifically, FIG. 2A shows an exemplary base portion 200 including a contour plate 110 and a tower 120. As discussed above, in some examples, the contour plate 110 may be integrally formed with the tower 120, and in other examples, the contour plate 110 may be removably attached to the tower 120. In the illustrated example, the contour plate 110 is molded to the left side of the patient. Thus, in an example where the contour plate 110 is molded to the right side of the patient, the contour plate 110 and base portion 200 are mirror images of those shown in FIG. 2A. In other examples, the contour plate 110 may be configured in a shape other than that shown that matches the contour and shape of an implant to be secured to the patient's clavicle.

[0038] In some embodiments, the contour plate 110 can include one or more openings, such as a large opening 204 and a small opening 206. The large opening 204 and the small opening 206 can be distributed in various orientations in various instances used to temporarily secure the medical sizing instrument 100 to a patient (e.g., to the patient's clavicle) with various surgical tools. Although only one of each of the large opening 204 and the small opening 206 is shown in the figures solely for clarity of illustration, it should be understood that the description of the large opening 204 and the small opening 206 can be equally applied to each of those shown in FIG. 2A. In some instances, the large opening 204 can be a spherical counterbore shape. In other instances, the large opening 204 can be a cylindrical counterbore shape. The large opening 204 can be used with a fixation tool to temporarily secure the medical sizing instrument 100, such as an olive wire, a clamp, a plate tack, or a screw. The small opening 206 can be used with a k-wire to temporarily secure the medical sizing instrument 100.

[0039] The exemplary tower 120 can include an opening 216 that extends from a top of the tower 120 to a bottom of the tower 120. As described in more detail below, the opening 216 is sized to allow a portion of the hook 140 to be positioned within and through the opening 216.

[0040] In some embodiments, the tower 120 can include a window 218. The window 218 can allow the surgeon to view a portion of the hook 140 positioned through the opening 216, and in particular, can allow the surgeon to view an indicator 258 (FIG. 2C) located on the hook 140. In various embodiments, the tower 120 can include a plurality of markings 220 adjacent the window 218. For example, the plurality of markings 220 can correspond to a hook depth provided on a clavicle hook plate system. Thus, the surgeon can view the indicator 258 on the hook 140 through the window 218 relative to the markings 220 to determine the depth of the hook 140. In other embodiments, the medical sizing instrument 100 can include another suitable arrangement of indicators for the surgeon to make measurements with the medical sizing instrument 100. For example, the hook 140 can include one or more indicators 258 positioned on the hook 140 such that the portion of the hook 140 including the indicator 258 is visible to the surgeon as it exits the tower 120 through the opening 216.

[0041] In some examples of the present disclosure, the tower 120 can removably secure the handle 130 (FIG. 2B) such that rotation of the handle 130 translates the hook 140 rather than translating the handle 130. In such examples, the tower 120 secures the handle 130 such that when the handle 130 is rotated, it remains stationary relative to a direction parallel to the axis about which the handle 130 rotates. For example, the tower 120 can include one or more blocks 212, 214 that removably secure the handle 130 to the tower 120. The blocks 212 and 214 allow the exemplary handle 130 to rotate and slide freely along the illustrated x-axis, but prevent the exemplary handle 130 from translating along the illustrated y-axis and z-axis when secured. In this manner, the exemplary handle 130 can be secured to the tower 120 during use and can be detached from the tower 120. Allowing for disassembly of the handle 130 from the tower 120 may allow for easier cleaning of the medical sizing instrument 100 in some cases.

[0042] In some examples of the present disclosure, the handle 130 may be permanently assembled with the tower 120 such that it cannot be removed. For example, in such examples, a block surrounding the entire perimeter of the handle 130 or a portion of the perimeter of the handle 130 may be manufactured on the tower 120 with the handle 130 in place such that the handle 130 is permanently held in place. Examples in which the handle 130 is permanently assembled with the tower 120 may reduce the number of separate components that need to be assembled in order to use the exemplary medical sizing instrument 100, thus increasing organizational efficiency in the operating room.

[0043] 2B illustrates an exemplary handle 130 according to one embodiment of the present disclosure. In some embodiments, the exemplary handle 130 can include a gripping portion 234 and a fixed portion 232. The fixed portion 232 can extend from the gripping portion 234 by a portion that is thinner than both the gripping portion 234 and the fixed portion 232. The thin portion and the fixed portion 232 allow the fixed portion 232 to be secured by blocks 212 and 214 on the tower 120. For example, the blocks 212 and 214 fit into the space between the gripping portion 234 and the fixed portion 232 to prevent the fixed portion 232 from translating along the illustrated z-axis.

[0044] In this exemplary medical sizing instrument 100, the handle 130 is configured to be removably secured to the hook 140 and adjustable relative to the hook. For example, the handle 130 may include an internal threaded portion (not shown) that extends at least a portion of the interior of the handle 130 from a lower portion of the handle 130 (e.g., at the fixed portion 232) toward an upper portion of the handle 130. In some cases, the internal threaded portion may extend all the way from the lower portion of the handle 130 to the upper portion of the handle 130 such that there are openings at both the lower and upper portions. In other examples, the internal threaded portion may start at the lower portion of the handle 130 and terminate inside the handle 130 before the upper end, such that there is only an opening at the lower portion. The internal threaded portion is configured to receive the threaded portion 256 (FIG. 2C) on the hook 140. In some cases, the handle 130 may include a notch 236 that allows the handle 130 to be rotated using a tool. For example, notch 236 may be a female driving feature of a hexalobe screw system that may be used with a male hexalobe driver, although notch 236 may be shaped for other suitable driver configurations in other examples.

[0045] FIG. 2C illustrates an exemplary hook 140 according to one embodiment of the present disclosure. The exemplary hook 140 may be shaped to replicate a hook design in a clavicle hook plate system. For example, the hook 140 may be L-shaped as shown and may include a first portion 252 integrally formed with a second portion 254. The first portion 252 may be at an angle (e.g., 85, 90, 95, 100, 105 degrees) relative to the second portion 254. In some embodiments, the second portion 254 may be longer than the first portion 252. In other embodiments, the second portion 254 may have a length equal to or less than the first portion 252.

[0046] The second portion 254 is shaped to be inserted through the opening 216 in the tower 120. In some embodiments, the second portion 254 may include a portion (e.g., a threaded portion 256) that removably secures the second portion 254 to the handle 130. In various embodiments, the second portion 254 of the hook 140 and the opening 216 in the tower 120 are correspondingly shaped to prevent the hook 140 from rotating when the handle 130 is rotated. For example, the second portion 254 and the opening 216 may each have a trapezoidal cross-section, thereby allowing the second portion 254 to be assembled to the tower 120 in only one orientation and preventing the hook 140 from rotating when the handle 130 is rotated.

[0047] In various embodiments, hook 140 is symmetrical and therefore can be assembled to either right or left base portion 200 as described above. For example, the trapezoidal cross-section of opening 216 in right tower 120 may be flipped 180 degrees compared to the trapezoidal cross-section of opening 216 in left tower 120 to accommodate hook 140.

[0048] Once the base portion 200, hook 140, and handle 130 are assembled, the hook 140 can translate relative to the base portion 200. In the exemplary medical sizing instrument 100, the hook 140 can translate by a threaded drive, although other translation mechanisms are described below. In this example, the second portion 254 of the hook 140 includes a threaded portion 256 configured to be inserted into an internal threaded portion of the handle 130. The second portion 254 includes a sufficient threaded portion 256 to allow the hook 140 to translate through a desired depth range upon rotation of the handle 130. For example, a threaded portion 256 that is too short may not allow the hook 140 to translate through the entire depth range and may not provide sufficient information to the surgeon, while a threaded portion 256 that is too long may be unnecessary, increase production costs, and / or interfere with the indicators 258 that are also present on the second portion 254. In some examples, the threaded portion 256 of the hook 140 and the corresponding internally threaded portion of the handle 130 may include a large pitch and additional clearance between the female and male thread forms to allow for quick and easy adjustment of the hook 140 by rotating the handle 130.

[0049] In other embodiments, the hook 140 may be translated by other mechanisms. For example, FIGS. 2D and 2E show a medical sizing instrument 260 configured with a sliding hook mechanism. FIG. 2D shows an exploded view of an exemplary medical sizing instrument 260 including a base portion 200 and a hook 140. The base portion 200 may include a contour plate 110 that is integral with or removably attached to the tower 120. The tower 120 may include an opening 262. The hook 140 includes a first portion 252 and a second portion 254. In this example, the second portion 254 of the hook 140 includes a sliding portion 264, a sliding portion 266, and a handle 268. As shown in FIG. 2E, the hook 140 may be positioned through the opening 262 in the tower 120 and slide when pushed or pulled in the direction of the double arrow 270. For example, the opening 262 can be sized such that when the sliding portion 264 and / or the sliding portion 266 of the hook 140 is inserted into the opening 262, the interior portion of the tower 120 forming the opening 262 applies a force to the sliding portion 264 and / or the sliding portion 266, thereby generating a frictional force. The frictional force can maintain the position of the hook 140 until the frictional force is overcome by pushing or pulling the hook 140 to slide the hook 140. For example, the medical practitioner can push or pull the handle 268 to translate the hook 140 and adjust its depth. In other examples, not shown, the hook 140 may be translated relative to the tower 120 by a worm gear, a rack and pinion, a cam and piston type mechanism, a wheel and coupling type mechanism, or other suitable mechanism. Those skilled in the art will understand how these other exemplary translation mechanisms can be implemented in light of the examples of translation mechanisms above.

[0050] Returning to FIG. 2C, in various embodiments, the second portion 254 of the hook 140 includes an indicator 258. For example, the indicator 258 may be a laser band around the perimeter of the second portion 254. As described above, when the second portion 254 of the hook 140 is placed through the opening 216 in the tower 120, the indicator 258 is visible through a window 218 in the tower 120. As the hook 140 translates relative to the tower (e.g., the handle 130 is rotated), the indicator 258 on the hook 140 moves within the window 218. Thus, the indicator 258 is visible through the window relative to the markings 220 to determine the depth at which the hook 140 is.

[0051] In certain embodiments, the medical sizing instrument provided (e.g., medical sizing instrument 100) may be configured such that hook 140 may be locked into a discrete position via a locking mechanism. For example, the discrete positions may be where indicator 258 of hook 140 is the same as each individual marking of markings 220 on tower 120. In such embodiments, the locking mechanism is sufficient to maintain hook 140 in a particular discrete position until the surgeon releases hook 140. Thus, in this manner, the locking mechanism can aid the surgeon in taking depth measurements without accidentally moving hook 140 and altering the measurements while the surgeon is positioning the medical sizing instrument.

[0052] FIG. 3A illustrates an exemplary medical sizing instrument 300 including a ball plunger / detent position locking mechanism. The exemplary medical sizing instrument 300 includes a base portion 200 and a hook 140. The base portion 200 may include a contour plate 110 that is integral with or removably attached to the tower 120. In some embodiments, the second portion 254 of the hook 140 may include a threaded portion 256 for translating the hook 140 via a threaded drive. In such embodiments, the medical sizing instrument 300 may include a handle 130 that engages with the threaded portion 256. In other embodiments, the second portion 254 of the hook 140 may be configured for other suitable mechanisms for translating the hook as described above. In this example, the second portion 254 of the hook 140 may include one or more notches 306A, 306B, and 306C. In at least some embodiments, the medical sizing instrument 300 includes a ball detent 308 that is inserted into an opening 310 in the tower 120. When hook 140 is positioned through opening 216 in tower 120, ball detent 308 can rest in each of notches 306A, 306B, and 306C as hook 140 translates such that ball detent 308 is positioned in notch 306A, 306B, or 306C. FIG. 3B illustrates a cross section of a portion of an exemplary medical sizing instrument 300 showing ball detent 308 resting in and positioned in notch 306B. A medical practitioner can translate hook 140 in the direction of double arrow 302 by applying a force to hook 140 as hook 140 is assembled to tower 120. Applying such a force to hook 140 moves the ball component of ball detent 308, allowing hook 140 to translate.

[0053] Ball detents 308 that fit into notches 306A, 306B, or 306C provide tactile feedback to the medical practitioner, for example, in the form of an audible "click" sound and / or additional resistance to movement of the hook. The ball plunger / detent position locking mechanism is sometimes referred to as a "soft stop" form of feedback because the hook 140 is allowed to translate when additional force is applied to the hook 140.

[0054] FIG. 3C illustrates an exemplary medical sizing instrument 330 including a spring-loaded pin position locking mechanism. The medical sizing instrument 330 includes a base portion 200 and a hook 140. The base portion 200 may include a contour plate 110 that is integral with or removably attached to the tower 120. In some embodiments, the second portion 254 of the hook 140 may include a threaded portion 256 for translating the hook 140 via a threaded drive. In such embodiments, the medical sizing instrument 300 may include a handle 130 that engages with the threaded portion 256. In other embodiments, the second portion 254 of the hook 140 may be configured for other suitable mechanisms for translating the hook as described above. In this example, the second portion 254 of the hook 140 includes one or more notches 336A, 336B, and 336C. In at least some embodiments, the medical sizing device 330 includes a pin 338 and a spring 344 that is inserted into an opening 340 in the tower 120. As the hook 140 translates through the opening 216 in the tower 120, the pin 338 moves into a notch 336A, 336B, or 336C due to the expansion of the spring 344.

[0055] For example, FIG. 3D illustrates a cross section of a portion of the exemplary medical sizing instrument 330 showing pin 338 moved into notch 336B. Pin 338 thereby locks hook 140 in place and secures the hook against movement in the direction of double arrow 348 until pin 338 is retracted against the expansion of spring 344. Pin 338 may be retracted against the expansion of spring 344, or may move into notches 336A, 336B, or 336C in the direction of double arrow 346 due to the expansion of spring 344. The spring-loaded pin position locking mechanism is sometimes referred to as a "hard stop" form of feedback because the medical practitioner cannot translate hook 140 until pin 338 is retracted. The spring-loaded pin mechanism of the exemplary medical sizing instrument 330 may also be implemented in ways other than the illustrated example, such as with a spring-loaded lever, a resilient tab, a torsion spring, or the like.

[0056] In another example of a position locking mechanism, FIG. 3E illustrates an exemplary medical sizing instrument 350 including a spring-loaded stepped tower position locking mechanism. The exemplary medical sizing instrument 350 includes a contour plate 110, a hook 140, and an exemplary tower 352. The contour plate 110 may be integral with the tower 352 or may be removably attached. The tower 352 may include an upper component 356A (e.g., a handle) and a lower component 356B. The upper and lower components 356A and 356B of the tower 352 are spring-loaded and configured to increase or decrease the distance between the upper component 356A and the lower component 356B. A medical practitioner may pull the upper component 356A away from the lower component 356B against the contraction of the spring in the direction of arrow 358. During separation, the medical practitioner can rotate upper component 356A relative to lower component 356B (e.g., in the direction of arrows 360A and 360B) to release upper component 356A, thereby increasing or decreasing the distance between upper component 356A and lower component 356B in discrete increments. As an example, tower 352, including upper and lower components 356A and 356B, can be configured according to the Biotrak Nail / Pin Plunger (80-0323) of the Biotrak system offered by Acumed®, the assignee of the present application.

[0057] In at least some embodiments, the upper component 356A may be connected (e.g., removably or fixedly) to the hook 140. Thus, as a medical practitioner adjusts the upper component 356A relative to the lower component 356B, the first portion 252 of the hook 140 can translate to a discrete position.

[0058] In other examples, not shown, the locking mechanism may be a snap / pivot lever, a cam type mechanism, a smooth post with only threads close to the measurement location, or any other type of positive index feature on a sliding post with features for alignment. One of ordinary skill in the art will understand how these other exemplary locking mechanisms can be implemented given the examples of locking mechanisms above.

[0059] In some examples of the present disclosure, the medical sizing instrument provided may be configured to be used to determine both a desired depth of the hook portion and a desired length of the plate portion. Figure 4A shows an exemplary medical sizing instrument 400 for determining both hook depth and plate length, according to one embodiment of the present disclosure. The exemplary medical sizing instrument 400 can include a contour plate 110, a tower 120, a handle 130, and a hook 140 configured according to any of the examples and embodiments described above.

[0060] The exemplary medical sizing instrument 400 can also include an extendable member 410 that can extend from the contour plate 110. For example, the extendable member 410 can be rotatably connected to the contour plate 110 by a hinge 412. In the illustrated example, the extendable member 410 can rotate about the hinge 412 in the direction of the double arrow 402. In some embodiments, as illustrated, the extendable member 410 can extend on the side of the contour plate 110 closest to the tower 120 (e.g., the side visible in FIG. 4A ) or can be folded flat. In other embodiments, the hinge 412 can allow the extendable member 410 to be folded on the side of the contour plate 110 furthest from the tower 120 (e.g., the side not visible in FIG. 4A ). Folding the extendable member 410 in this manner to a closed position can be beneficial for saving space in storage. From the closed position, the extendable member 410 can be extended as shown for use.

[0061] In other examples, the extensible member 410 can have other suitable configurations such that the extensible member 410 can be folded into a closed position and extended from the contour plate 110 into an extended position. For example, the extensible member 410 can be hinged to rotate in a plane parallel to the contour plate 110. Although the exemplary medical sizing instrument 400 is shown with a threaded drive mechanism for translating the hook 140 relative to the tower 120, it will also be understood that the medical sizing instrument 400 may be configured according to any of the translation mechanisms described above.

[0062] In some embodiments, the extendable member 410 can include a large opening 414 and a small opening 416 for temporarily securing the extendable member 410 to a patient (e.g., to the patient's clavicle). The large and small openings 416 can be the same as or similar to the large and small openings 204 and 206 of the contoured plate 110. In some embodiments, the extendable member 410 can be contoured in the same manner as the contoured plate 110 such that when extended, the extendable member 410 is a continuation of the contoured plate 110.

[0063] In another example of an extendable member for determining a desired length of a plate portion, FIG. 4B shows a base component 200 and an add-on ruler 430 of an exemplary medical sizing instrument 420. The base component 200 can include a tower 120 and a contour plate 110. Although not shown, the medical sizing instrument 420 also includes a hook 140. The tower 120, the contour plate 110, and the hook 140 can be configured according to any of the examples and embodiments described above. In this example, the contour plate 110 can include a post 428. A removable add-on ruler 430 (e.g., an extendable member) of the medical sizing instrument 420 can be coupled with the contour plate 110 to extend the length of the contour plate 110.

[0064] In various embodiments, the add-on ruler 430 can include a base 432. A handle 434 can extend from the base 432. The handle 434 allows the surgeon to La The base 432 of various embodiments may be configured to have one or more openings 436A, 436B. The add-on ruler 430 may be coupled to the contour plate 110 by positioning one of the openings 436A, 436B over the post 428. Stated differently, the post 428 is positioned through one of the openings 436A, 436B. In at least some embodiments, the post 428 and the one or more openings 436A, 436B may each be correspondingly shaped such that the add-on ruler 430 may only be oriented in a single orientation relative to the openings 436A, 436B and the post 428. For example, the illustrated semi-elliptical shape of the post 428 and the openings 436A and 436B only allows the post 428 to be inserted through the openings 436A or 436B in a single orientation. The corresponding geometry between post 428 and opening 436A or 436B also prevents add-on ruler 430 from rotating when coupled to contour plate 110. In this manner, add-on ruler 430 may always be coupled to contour plate 110 in a consistent manner, thereby assisting medical practitioners in obtaining accurate length measurements.

[0065] In another example of an extendable member for determining a desired length of a plate portion, FIGS. 4C and 4D show a base component 200, a slide member 450, and a knob 446 of an exemplary medical sizing instrument 440. The base component 200, in this example, can include a tower 120 and a contour plate 444. The contour plate 444 can be integral with or removably attached to the tower 120. In at least some embodiments, the slide member 450 can include a body 452 that is integral with or attached to a handle 454. Although not shown, the medical sizing instrument 440 also includes a hook 140. The tower 120 and the hook 140 can be configured according to any of the examples and embodiments described above. The contour plate 444 can be molded with the contours described above for the contour plate 110.

[0066] FIG. 4C illustrates an exploded view of the medical sizing instrument 440 showing the sliding member 450 separated from the contour plate 444. The contour plate 444 includes a chamber (not shown) into which the body 452 of the sliding member 450 can be inserted, as shown in the perspective view of FIG. 4D. The knob 446 of the exemplary medical sizing instrument 440 can be adjusted to vary the level of engagement between the knob 446 and the sliding member 450. For example, the contour plate 444 can include a threaded hole 448 into which the threaded portion of the knob 446 can be positioned. In this example, the more the knob 446 is tightened, the more force the knob 446 applies to the sliding member 450, maintaining the sliding member 450 in that position as a result of frictional forces. Conversely, the more the knob 446 is loosened, the less force the knob 446 applies to the sliding member 450, and the more easily the sliding member 450 slides within the chamber of the contour plate 444. In other examples, a different suitable mechanism other than the screw knob 446 can be utilized to maintain the position of the slide member 450 relative to the contour plate 444 .

[0067] In some embodiments, as shown, the contour plate 444 does not include an opening (e.g., openings 204, 206) for a fixation tool to temporarily secure the medical sizing device 440. In other embodiments, the contour plate 444 may include at least one large opening 204 and / or at least one small opening 206 for a fixation tool. In such embodiments, the at least one large opening 204 and / or the at least one small opening 206 are offset from the chamber of the contour plate 444 so as not to interfere with the slide member 450. In at least some embodiments, the knob 446 and slide member 450 may be completely removed from the contour plate 444 (e.g., as shown in FIG. 4C), which allows for easier cleaning.

[0068] 4D shows the medical sizing instrument 440 with the sliding member 450 positioned almost completely within the chamber of the contour plate 444. The medical practitioner can slide the sliding member 450 out of the chamber a sufficient distance to take a measurement. In the illustrated example, the contour plate 444 is shown without fixed openings as described above in connection with various other embodiments. However, in other examples, the contour plate 444 may include one or more fixed openings. In some aspects, the sliding member 450 may be configured on top of or below the contour plate 444 rather than within the contour plate 444.

[0069] FIG. 4E illustrates additional examples of length measuring components that can be used with the provided medical sizing devices. In particular, FIG. 4E illustrates an indexing ruler 466 that can be used with the base component 200 of the medical sizing instrument 100. In other examples, the indexing ruler 466 can be used with the base component 200 of the medical sizing instrument 260, 300, 330, or 350. In at least some embodiments, the body 474 of the indexing ruler 466 has a length that allows for measurements for each plate length in a clavicle hook plate system. For example, the indexing ruler 466 can include length indicia 470A, 470B, 470C, and 470D, each corresponding to a different plate length in a clavicle hook plate system. In at least some embodiments, the indexing ruler 466 can include a notch 468. A medical professional can position the indexing ruler 466 in the direction of the arrow 472 on top of the contour plate 110 such that a portion of the tower 120 is positioned within the notch 468. The notch 468 is configured to match a portion of the tower 120 such that the indexing ruler 466 can only be positioned in a single orientation and is stable when the tower 120 is positioned within the notch 468. Thus, the notch 468 allows for precise positioning of the indexing ruler 466 relative to the hook 140.

[0070] Once the indexing ruler 466 is positioned, the medical practitioner can use the indexing ruler 466 to make a length measurement. In various embodiments, the indexing ruler 466 can include fixed openings (e.g., large opening 204 and small opening 206) as shown. In such embodiments, the fixed openings on the indexing ruler 466 can align with the fixed openings on the contour plate 110. Thus, both the indexing ruler 466 and the contour plate 462 can be temporarily fixed together to the patient in such embodiments.

[0071] In yet another example of an expandable member or length-measuring component, a provided medical sizing device may include an expandable member that can be stored in a roll and unrolled as needed.

[0072] Thus, when using the medical sizing instrument provided, the surgeon can position any of the extendable members (e.g., length measuring components) described above and determine the appropriate length of the contour plate. For example, in some cases, the appropriate length may be the length of the contour plate 110 attached to the tower 120, which is typically the shortest length provided in a clavicle hook plate system. However, in other instances, the appropriate length may be longer, and thus the extendable members allow the surgeon to determine how long to make so that the surgeon can select the appropriate clavicle hook plate for implantation. In some embodiments, the surgeon can determine the appropriate contour plate length without inserting the hook 140 into the tower 120. Stated another way, in one example, the surgeon can determine the appropriate contour plate length using only the base component 200.

[0073] Figure 5 illustrates a flowchart of an exemplary method 500 according to one aspect of the disclosure. Although the following examples are described with reference to the flowchart illustrated in Figure 5, many other ways of implementing the acts associated with Figure 5 may be used. For example, the order of some of the blocks may be changed, certain blocks may be combined with other blocks, one or more of the blocks may be repeated, and some of the described blocks may be optional.

[0074] The exemplary method 500 begins by inserting a medical sizing instrument (e.g., medical sizing instrument 100) into a patient through an incision in the patient's shoulder (block 502). The surgeon may insert the medical sizing instrument 100 so that the contour plate 110 contacts the patient's clavicle. The surgeon may then adjust the depth of the hooks (e.g., hooks 140) of the medical sizing instrument 100 (block 504). For example, the surgeon may rotate the handle 130 clockwise and / or counterclockwise to adjust the depth of the hooks 140. The surgeon may then determine a desired depth of the hooks 140 (block 506). For example, the surgeon may determine a depth of the hooks 140 that the surgeon believes will best maintain the anatomical alignment of the patient's clavicle and acromion. The surgeon may then select a clavicle implant that corresponds to the desired depth of the hooks (block 508). In some cases, the surgeon may also use the medical sizing instrument to determine a desired length of the clavicle implant. For example, the surgeon can determine a desired implant length using the contour plate 110 and / or a member that extends the measured length of the contour plate 110 (e.g., indexing ruler 466). The surgeon can then select a clavicle implant that corresponds to the desired hook depth and the desired implant length.

[0075] FIG. 6 illustrates an exemplary medical sizing instrument 100 inserted into a patient 600 to determine the appropriate hook depth, according to one embodiment of the present disclosure. The left side of the patient 600 is shown, and therefore the medical sizing instrument 100 includes a plate contoured to the patient's left side. For context, the humerus 640 and ribs 650A-D of the patient 600 are shown. Once the surgeon has incised the shoulder of the patient 600 and obtained proper exposure to the clavicle 620 and acromioclavicular joint of the patient 600, and performed the necessary pre-reduction steps, the surgeon inserts the medical sizing instrument 100. The surgeon inserts the medical sizing instrument 100 so that its plate (e.g., contour plate 110) rests on the distal portion of the clavicle 620 and the hook (e.g., hook 140) extends across the acromioclavicular joint below the acromion 630. This is the same location that a clavicle hook plate is implanted in after the appropriate sizing has been determined.

[0076] In some cases, the surgeon may provisionally fix the medical sizing instrument 100 in place once positioned using instruments such as k-wires, plate tacks, and clamps. However, these are not shown. Once the medical sizing instrument 100 is positioned, the surgeon may verify the position and reduction of the distal portion of the clavicle 620 and / or the acromioclavicular joint based on the configuration of the medical sizing instrument 100. If the surgeon determines that the depth of the hooks 140 is not correct, in some cases, the surgeon may adjust the depth of the hooks 140 while the medical sizing instrument 100 remains in place (e.g., by rotating the handle 130) and re-evaluate the position and reduction. In other examples, the surgeon may remove the medical sizing instrument 100 from the patient, adjust the depth of the hooks 140, and then re-insert the medical sizing instrument 100 with the adjusted hook 140 depth before re-evaluating the position and reduction.

[0077] Once the surgeon adjusts the depth of the hook 140 to a depth the surgeon determines will result in good reduction of the distal portion of the clavicle 620 and / or the acromioclavicular joint, the surgeon can read the determined depth from the medical sizing instrument 100. For example, the surgeon can view an indicator (e.g., indicator 258) on the hook 140 through a window (e.g., window 218) in the tower (e.g., tower 120) of the medical sizing instrument 100 compared to a marking (e.g., marking 220) on the tower 210 to read the determined depth, as described above. In some cases, the determined depth may be between two of the markings 220 and thus between two depth offerings in the clavicle hook plate system the surgeon is using. In such a case, the surgeon can use that information to determine which offered depth between the two is best for the patient, such as the offered depth closest to the determined depth. After the surgeon has determined the appropriate hook depth for the patient, the surgeon can remove the medical sizing instrument 100 from the patient and select a clavicle hook plate having the determined appropriate hook depth for implantation.

[0078] Thus, a surgeon can determine the appropriate hook depth for a patient using just one template, the exemplary medical sizing instrument 100. The surgeon can avoid the need to switch between multiple templates to evaluate hook depth, which can be time consuming and reduce accuracy. For example, if the ideal hook depth is between two offered hook depths, the surgeon can determine the ideal hook depth and use that information to determine which offered hook depth is best. Instead, a surgeon who relies on multiple templates must rely on eyesight and memory as the surgeon switches between the two templates at either end of the ideal hook depth.

[0079] Without further elaboration, it is believed that those skilled in the art can use the preceding description to make the most of the claimed invention. The examples and embodiments disclosed herein should be construed as merely illustrative and in no way limit the scope of the present disclosure. It will be apparent to those skilled in the art that changes can be made to the details of the above-described embodiments without departing from the basic principles described. In other words, various modifications and improvements of the embodiments specifically disclosed in the above description are within the scope of the appended claims. For example, any suitable combination of features of the various embodiments described is contemplated.

Claims

1. 1. A medical sizing instrument for a clavicle hook plate, comprising: a tower including an opening extending from an upper end of the tower to a lower end of the tower; a contoured plate extending from the tower, the contoured plate being shaped to match the contour and shape of a clavicle plate implant to be secured to the patient's clavicle; a hook including a first portion at an angle to a second portion, at least a portion of the second portion being positioned through the opening in the tower; Handle and Equipped with the handle is engageable to adjust the distance between the first portion of the hook and the bottom end of the tower; Medical sizing equipment.

2. The medical sizing instrument of claim 1 , wherein engaging the handle comprises rotating the handle to adjust the distance between the first portion of the hook and the bottom end of the tower.

3. 2. The medical sizing instrument of claim 1, wherein the second portion of the hook includes an external thread and the handle includes an internal thread, the internal thread of the handle engaging the external thread of the hook when the handle is engaged, thereby adjusting the distance between the first portion of the hook and the bottom end of the tower.

4. The medical sizing instrument of claim 3 , wherein the handle is removably or permanently secured to the tower.

5. The medical sizing instrument of claim 1 , wherein the second portion of the hook includes the handle.

6. 6. The medical sizing instrument of claim 5, wherein the second portion of the hook and the tower are configured such that engaging the handle includes translating the handle toward or away from the top end of the tower to adjust the distance between the first portion of the hook and the bottom end of the tower.

7. 2. The medical sizing instrument of claim 1, wherein the tower includes upper and lower components configured such that the distance between the upper and lower components can be adjusted via a spring-loaded stepped locking mechanism, the upper component being the handle.

8. The medical sizing instrument of claim 1 , wherein the contour plate is integrally connected to the tower.

9. 2. The medical sizing instrument of claim 1, wherein the first portion of the hook extends from the second portion in a first direction relative to the tower and the contour plate extends from the tower in a second direction, the first direction being substantially opposite the second direction.

10. The tower further includes a window and a plurality of markings adjacent to the window, the second portion of the hook including an indicator marking that indicates when the distance between the first portion of the hook and the bottom end of the tower is adjusted.

2. The medical sizing device of claim 1, wherein the medical sizing device is configured to be operatively coupled to the patient.

11. 2. The medical sizing instrument of claim 1, wherein the second portion of the hook and the opening in the tower are configured such that the second portion of the hook can be positioned through the opening in the tower in only a single orientation.

12. The medical sizing instrument of claim 1 , further comprising a member pivotally or slidably coupled to the contour plate such that the member can be deployed to extend a measured length of the contour plate.

13. 2. The medical sizing instrument of claim 1, wherein the medical sizing instrument is configured such that the hook can be temporarily locked in distinct positions when the handle is engaged to adjust the distance between the first portion of the hook and the bottom end of the tower, each distinct position corresponding to a distinct distance between the first portion of the hook and the bottom end of the tower.

Images