Devices for installing retaining orthopedic compression implants

Abstract

A retention block body for a retention block to manipulate an orthopedic implant having a bridge and a plurality of legs includes a flexible bridge, a pair of levers joined via the flexible bridge, each lever having a first end and a second end, wherein the pair of levers are pivotable with respect to each other about the flexible bridge, an implant slot configured to receive the orthopedic implant, the implant slot including a pair of leg slots disposed in the second ends of the levers and configured to receive the legs of the orthopedic implant, and a bridge portion configured to abut the bridge of the orthopedic implant, wherein manipulation of the first ends of the levers transitions the orthopedic implant between a retracted conformation and an expanded conformation in which a central axis of each of the legs are substantially parallel.

Description

DEVICES FOR INSTALLING RETAINING ORTHOPEDIC COMPRESSIONIMPLANTSCROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to U.S. Provisional Application Serial No. 63 / 677,999 filed on July 31 , 2024, and entitled “Devices for Installing Retaining Orthopedic Compression Implants,” which is hereby incorporated herein by reference in its entirety for all purposes.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

[0002] Not applicable.BACKGROUND

[0003] Staple-style orthopedic implants are often used to provide fixation and stability at a fracture, osteotomy or arthrodesis site to enable fusion. Some orthopedic implants are shape memory compression implants that may change dimensions to offer greater fixation and stability to enable improved fusion.

[0004] Despite the advances in shape memory compression staples, such those made from Nitinol, the surgical implementation of these implants has been hindered by limitations in existing insertion devices and tools. Traditional insertion instruments often fail to adequately control the orientation and positioning of the implant legs during installation, leading to suboptimal placement and reduced compression effectiveness. Many existing tools require the surgeon to manually manipulate the implant while simultaneously attempting to insert the legs into pre-drilled holes, creating a technically challenging procedure that can result in implant misalignment, inadequate seating, or damage to the surrounding bone.

[0005] For instance, convention insertion devices may lack the ability to maintain the implant in a controlled, expanded configuration during installation. Existing tools often require external constraint devices to mechanically open and constrain the legs of the implant, but these devices frequently interfere with the surgical procedure or fail to provide adequate control over the implant's final positioning. Additionally, many current insertion instruments do not provide a reliable mechanism for releasing the implant after installation without disturbing its placement or compromising the compression forces applied across the osteotomy or arthrodesis site.

[0006] As such, there exists a need for an insertion system that can reliably maintain implant orientation during installation, provide controlled release mechanisms, and ensure optimal positioning to maximize the therapeutic benefits of shape memory compression staples.BRIEF SUMMARY OF THE DISCLOSURE

[0007] An embodiment of a retention block body for a retention block to manipulate an orthopedic implant having a bridge and a plurality of legs comprises a flexible bridge, a pair of levers joined via the flexible bridge, each lever having a first end and a second end, wherein the pair of levers are pivotable with respect to each other about the flexible bridge, an implant slot configured to receive the orthopedic implant, the implant slot including a pair of leg slots disposed in the second ends of the levers and configured to receive the legs of the orthopedic implant, and a bridge portion configured to abut the bridge of the orthopedic implant, wherein manipulation of the first ends of the levers transitions the orthopedic implant between a retracted conformation and an expanded conformation in which a central axis of each of the legs are substantially parallel. In some embodiments, the retention block body comprises a unitary structure formed as a single component. In some embodiments, the flexible bridge is configured to allow the pair of levers to be pivoted with respect to each other by squeezing together the first ends of the levers. In certain embodiments, each of the leg slots is disposed in the second end of one of the levers, and the leg slots are configured to manipulate orientation with respect to one another when the levers are pivoted. In certain embodiments, the retention block body is configured to be deformed to enable the orthopedic implant to be loaded into the implant slot without manipulating or deforming the orthopedic implant. In some embodiments, the second ends of the pair of levers are defined by medial surfaces having outwardly projecting shoulders formed thereon. In some embodiments, the retention block body has a first state in which the first ends of the pair of levers are spaced by a first distance, and a second state in which the first ends of the pair of levers are spaced by a second distance that is different from the first distance, and the retention block body is configured to lock the orthopedic implant into the implant slot when occupying the first state and to release the orthopedic implant from the implant slot when occupying the second state. In certain embodiments, the first distance is greater than the second distance.

[0008] An embodiment of a retention block keystone for a retention block to retain an orthopedic implant in an expanded conformation comprises a base portion including a pair of ramps, and a central pillar extending from the base portion and having a width configured to retain the orthopedic implant in the expanded conformation when the retention block keystone is disposed between second ends of a pair of levers of a retention block body, wherein the central pillar comprises a tapered upper profile configured to aid insertion of the retention block keystone between the second ends of the levers. In certain embodiments, the pair of ramps are disposed so as to be aligned with retention springs of an insertion device. In some embodiments, the central pillar has a width such that when the retention block keystone is disposed between the second ends of the pair of levers, the orthopedic implant is retained in the expanded conformation. In some embodiments, the tapered upper profile is configured to urge the second ends of the levers apart when the retention block body is pushed downwardly over the retention block keystone. In certain embodiments, the central pillar is configured to seat between the second ends of the levers to retain the orthopedic implant in a deformed state. In certain embodiments, the central pillar is defined by an opposing pair of lateral sides and wherein a first receptacle is formed along both of the pair of lateral sides. In some embodiments, a second receptacle is formed along both of the pair of lateral sides that is spaced from the first receptacle.

[0009] An embodiment of a system for manipulating and retaining an orthopedic implant, the orthopedic implant including a bridge and a plurality of legs comprises a retention block body, comprising a flexible bridge, a pair of levers joined via the flexible bridge and pivotable with respect to each other, and an implant slot configured to receive the orthopedic implant, a retention block keystone comprising a base portion, and a central pillar configured to be disposed between second ends of the levers to retain the orthopedic implant in an expanded conformation, wherein the retention block body is configured to transition the orthopedic implant from a retracted conformation to the expanded conformation, and the retention block keystone is configured to maintain the orthopedic implant in the expanded conformation. In some embodiments, the retention block body comprises a unitary structure, and the flexible bridge allows the pair of levers to be pivoted with respect to each other about the flexible bridge. In certain embodiments, the central pillar comprises a tapered upper profile configured to aid insertion of the retention block keystone between the second ends of the levers. In certain embodiments, the base portion of the retention block keystone includes a pair oframps configured to be aligned with retention springs of an insertion device. In some embodiments, the orthopedic implant includes a bridge and a plurality of legs, and the expanded conformation is characterized by a central axis of each of the legs being substantially parallel such that curvature of the bridge is lessened.BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Fora detailed description of exemplary embodiments of the disclosure, reference will now be made to the accompanying drawings in which

[0011] Figure 1 is a perspective view of a staple-style orthopedic implant according to one or more embodiments herein.

[0012] Figure 2 is a perspective view of an insertion system for holding, manipulating, and installing a staple-style implant according to one or more embodiments herein.

[0013] Figure 3 is a front view of the insertion system of Figure 2.

[0014] Figure 4 is an exploded view of the insertion system of Figure 2 showing the individual components including the insertion device, retention block body, and retention block keystone according to one or more embodiments herein.

[0015] Figure 5 is a perspective view of the handle shown in isolation according to one or more embodiments herein.

[0016] Figure 6 is a perspective view of the retention springs, cross pin, and central pin shown in isolation, with the retention springs engaging a staple-style implant according to one or more embodiments herein.

[0017] Figure 7 is a side view showing the retention spring arms in a closed configuration according to one or more embodiments herein.

[0018] Figure 8 is a side view showing the retention spring arms in the closed configuration engaging an implant according to one or more embodiments herein.

[0019] Figure 9 is a side view showing the retention spring arms in an open configuration according to one or more embodiments herein.

[0020] Figure 10 is a side view showing the retention spring arms in the open configuration disengaged from an implant according to one or more embodiments herein.

[0021] Figure 11 is a perspective view showing the slider in an axially-extended position with the insertion device in a first configuration according to one or more embodiments herein.

[0022] Figure 12 is a perspective view showing the slider in an axially-retracted position with the insertion device in a second configuration according to one or more embodiments herein.

[0023] Figure 13 is a perspective view of the retention block body according to one or more embodiments herein.

[0024] Figure 14 is another perspective view of the retention block body according to one or more embodiments herein.

[0025] Figure 15 is a back view of the retention block body showing the implant slot according to one or more embodiments herein.

[0026] Figure 16 is a perspective view of the retention block body with an implant loaded in a retracted conformation according to one or more embodiments herein.

[0027] Figure 17 is a perspective view of the retention block body with an implant in an expanded conformation according to one or more embodiments herein.

[0028] Figure 18 is a perspective view of the retention block keystone showing the base portion and central pillar with tapered upper profile according to one or more embodiments herein.

[0029] Figure 19 is a perspective view showing the retention block keystone disposed between the levers of the retention block body according to one or more embodiments herein.

[0030] Figure 20 is a perspective view showing the process of loading an implant into the retention block body according to one or more embodiments herein.

[0031] Figure 21 is a back view showing the process of loading an implant into the retention block body according to one or more embodiments herein.

[0032] Figures 22-24 are perspective views showing methods of engaging the retention block keystone with the retention block body to retain the implant in a deformed state according to one or more embodiments herein.

[0033] Figures 25-29 are front views showing a method including the engagement of the insertion device with the implant and subsequent removal of the retention block components according to one or more embodiments herein.

[0034] Figures 30-32 are perspective views showing a method including the engagement of the insertion device with the implant and subsequent removal of the retention block components according to one or more embodiments herein.

[0035] Figures 33-35 are front views showing a method including the final deployment of the implant into bone segments according to one or more embodiments herein.

[0036] Figures 36-38 are perspective views showing a method including the final deployment of the implant into bone segments according to one or more embodiments herein.

[0037] Figure 39 is a side view of a retention block according to one or more embodiments herein.

[0038] Figure 40 is a front view of the retention block of Figure 39.

[0039] Figure 41 is a perspective view of the retention block of Figure 39.

[0040] Figure 42 is a bottom view of the retention block of Figure 39.

[0041] Figure 43 is a perspective view of a retention block according to one or more embodiments.

[0042] Figures 44 and 45 are cross-sectional views of a retention block body according to one or more embodiments.

[0043] Figure 46 is a side view of the retention block of Figure 43.

[0044] Figures 47 and 48 are cross-sectional views of the retention block of Figure 43.

[0045] Figures 49-51 are cross-sectional views of the retention block of Figure 43.DETAILED DESCRIPTION

[0046] The following discussion is directed to various exemplary embodiments. However, one of ordinary skill in the art will understand that the examples disclosed herein have broad application, and that the discussion of any embodiment is meant only to be exemplary of that embodiment, and not intended to suggest that the scope of the disclosure, including the claims, is limited to that embodiment.

[0047] The drawing figures are not necessarily to scale. Certain features and components herein may be shown exaggerated in scale or in somewhat schematic form and some details of conventional elements may not be shown in interest of clarity and conciseness.

[0048] In the following discussion and in the claims, the terms “including” and “comprising” are used in an open-ended fashion, and thus should be interpreted to mean “including, but not limited to... .” Also, the term “couple” or “couples” is intended to mean either an indirect or direct connection. Thus, if a first device couples to a second device, that connection may be through a direct connection of the two devices, or through an indirect connection that is established via other devices, components, nodes, and connections. In addition, as used herein, the terms “axial” and “axially” generally mean along or parallel to a given axis (e.g., central axis of a body or a port), while the terms“radial” and “radially” generally mean perpendicular to the given axis. For instance, an axial distance refers to a distance measured along or parallel to the axis, and a radial distance means a distance measured perpendicular to the axis. As used herein, the terms “approximately,” “about,” “substantially,” and the like mean within 10% (i.e., plus or minus 10%) of the recited value. Thus, for example, a recited angle of “about 80 degrees” refers to an angle ranging from 72 degrees to 88 degrees.

[0049] Unless the context dictates the contrary, all ranges set forth herein should be interpreted as being inclusive of their endpoints, and open-ended ranges should be interpreted to include only commercially practical values. Similarly, all lists of values should be considered as inclusive of intermediate values unless the context indicates the contrary.

[0050] Staple-style orthopedic implants are designed to provide fixation and stability at a fracture, osteotomy, or arthrodesis site to enable fusion. Such implants may include 2 or more legs. The legs of the implant are connected via a bridge that may come in various forms, sizes and shapes depending on the particular application and anatomy. The implants are often part of a system that includes instruments for use with the implants in an associated surgical technique.

[0051] There are generally three types of orthopedic staple-style implants: (1) static staples, (2) mechanical compression staples, and (3) shape memory compression staples. Static staples generally represent the first-generation orthopedic bone staples. These basic, U-shaped staples are typically made from medical grade titanium or stainless-steel materials suitable for medical device application. Traditional milling, wire- EDM, or wire-bending methods are usually employed to manufacture static staples. Static staples usually provide minimal to no compression to an osteotomy or arthrodesis site, and provide minimal stability to promote fusion at the site. Mechanical compression staples are typically manufactured from stainless steel materials. These staples rely on the application of an external force to achieve compression between bone fragments at an osteotomy or arthrodesis site. In particular, by physically bending the bridge with a suitable instrument, the distance between the implant legs is shortened, thereby allowing the legs to provide compression therebetween. Due to the limited elasticity of stainless steel, the compression provided is relatively short-lived. In addition, the deformation of the bridge may cause the tips of the implant legs to splay resulting in the distraction of the bone segments. Shape memory compression staples are often made from medical grade Nitinol suitable for medical device applications. Nitinol is a metal alloy made ofapproximately half nickel and half titanium. Nitinol exhibits phase transformation whereby the molecular arrangement of Nitinol can vary according to the temperatures to which it is exposed. At lower temperatures, the crystalline architecture of Nitinol resembles an accordion making it relatively unstable, malleable, and weak. This is referred to as the martensitic phase of Nitinol (martensite). At higher temperatures, the crystalline structure of Nitinol is rearranged into a cubic form making it contracted, rigid, and strong. This is referred to as the austenitic phase of Nitinol (austenite). The temperature range at which Nitinol transforms from the martensitic phase into austenitic phase can be adjusted and manipulated through manufacturing processes. During manufacturing, a Nitinol device undergoes heat treatments that “program” the temperature ranges that trigger the transition between the martensitic and austenitic phases. For example, when a Nitinol device is heated, the programing dictates the beginning of the phase transformation from martensite to austenite (Austenite Start temperature or As) and the end of the transformation (Austenite Finish temperature or Af). In addition, when a Nitinol device is cooled, the programming dictates the beginning of the phase transformation from austenite to martensite (Martensite Start temperature or Ms) and the end of the transformation (Martensite Finish temperature or Mf). In addition to the aforementioned phase transformation, Nitinol exhibits shape memory and superelastic / pseudoelastic characteristics.

[0052] With regards to shape memory, a Nitinol device can be designed to transform from one shape to another when exposed to heat. For example, prior to heat treating, the Nitinol device may be cooled, and thus become malleable in the martensite material phase and shaped into a particular form that imparts internal residual stresses. Heat treatment can then be applied, which sets or “bakes” this established shape into the memory of the implant. Then, when the Nitinol device is heated through its transformation temperature range, the device will revert to its predetermined final shape as it undergoes the phase transformation to Austenite.

[0053] Compared to most other metals, Nitinol can withstand a large amount of strain, for example up to 8%, and still recover its original shape. The superelastic characteristic is displayed when a Nitinol staple is warmed through its transformation temperature range but is constrained and prevented from returning to its original shape. While constrained in a deformed shape, as is the case when a Nitinol bone staple is in bone, continuous exposure to sufficient heat allows the implant to behave like an elastic spring. This superelastic effect thus may be used to maintaining a long-term compressive forcebetween bone segments over a large displacement range. In other embodiments, the implant may not require heating in order to be provided with this superelastic effect.

[0054] There are two varieties of staples are made from Nitinol: Thermally-activated and Superelastic. The transition temperature ranges of these types of implants vary and can be classified as either heat-activated or body temperature-activated. Heat-activated Nitinol bone staples have an Asand Af above body temperature. These implants are inserted into bone in the malleable martensitic phase and are exposed to an external heat via electrocautery or bi-polar electrical resistance to convert the implant from martensite to austenite, and thus, promote shape change that creates initial compression between joined bone segments. Compression is maintained through the superelastic effect as the implant is constrained in an open position by the bone segments. Body temperature-activated Nitinol bone staples have a transition temperature range that is slightly lower than body temperature. Since their austenite start temperature (As) may be at or below room temperature, these implants may utilize freezer storage to prevent premature closure. These implants are placed into the osteotomy or arthrodesis site while still in a frozen state, and then compress the joined bone segments through the shape memory effect as they warm to body temperature. Compression is again maintained through the superelastic effect as the implant is constrained in an open position by the bone segments. Both types of thermally-activated Nitinol implants (e.g., heat- and body temperature-activated) have not, however, been widely accepted. Due to manufacturing limitations of thermally-activated Nitinol, traditional machining methods (milling, grinding, turning, etc.) have generally not been cost-effective. Thus, many Nitinol staples are created using raw Nitinol wire material that is bent to the desired shape and heat treated to set the shape. This has generally limited implant geometries to simple U-shaped staples having two legs and a constant cross-section between the distal ends of the implant legs.

[0055] Superelastic shape memory compression staples are the latest generation of Nitinol bone implants. The austenite finish temperature (Af) for these implants is significantly below room temperature, for example 10 to -20 degrees C, thus freezer storage to maintain an initial shape in the martensite material phase may not be sufficient, as implants may begin to deflect before being placed into the osteotomy or arthrodesis site. Thus, in some instances, external constraint devices may be used to mechanically open and constrain the legs of the implant prior to inserting them into pre-drilled holes inbone. Upon release of the constraining tool, the superelastic effect is transferred from the tool to the bone to achieve compression across the osteotomy or arthrodesis site.

[0056] In one or more embodiments disclosed herein are devices for installing a retaining orthopedic compression implant, for example, a staple-style implant. Referring now to Figure 1 , an example of such a staple-style implant 100 is shown. In this embodiment, implant 100 is a U-shaped staple used to fix, stabilize, and apply compression (illustrated with arrows 18 in Figure 1 ) to a fracture 12 between a first bone segment 2 and a second bone segment 4 of a broken bone. Each bone segment 2, 4 has a curved outer surface or profile 7, 9, respectively, proximal implant 100. Bone segments 2, 4 represent an exemplary curved profile (e.g., round, elliptical, etc.) such as that of a generally cylindrical long bone (e.g., femora, tibiae, humeri, ulnae, metacarpals, clavicle, etc.), however, as will be described more fully below, implant 100 may be used with any classification of bone (e.g., short, flat, sutural, irregular, sesamoid, or long), and in locations with or without a curved profile. Although break 12 is shown generally along a plane oriented perpendicular to curved profiles 7, 9, in general, break 12 may be positioned at any angle with respect to curved profiles 7, 9.

[0057] In this embodiment, implant 100 includes a bridge 110 and a plurality of legs 130 extending from bridge 110. When secured to bone segments 2, 4, bridge 110 extends across or spans break 12, while legs 130 penetrate into corresponding bone segments 2, 4 via holes 14, 16, respectively. In particular, a first hole 14 is drilled into first bone segment 2 and a second hole 16 is drilled into second bone segment 4. First hole 14 has a linear central or longitudinal axis 15 and second hole 16 has a linear central or longitudinal axis 25 that is spaced apart from and oriented parallel to first axis 15. Legs 130 are pressed into and secured within holes 14, 16 via an interference fit, and maintain static positions relative to bone segments 2, 4, as elastic energy stored within implant 100 applies compression 18 across the break 12.

[0058] In this embodiment, implant 100 is made of a Nitinol material, and thus, can be heat treated and programed, as discussed above, to have shape memory and superelastic / pseudoelastic characteristics such that implant 100 may be classified as a superelastic shape memory implant, and may transform from one shape to another when exposed to heat.

[0059] The surgical use of implant 100 may utilize the shape memory characteristics of Nitinol to impart compressive loads across a fracture, osteotomy, or arthrodesis site (e.g., compression 18 across break 12 as shown in Figure 1 ) to enable fusion. In themanner previously described, implant 100 can be made of Nitinol and programed though deformation and heat treatment, such that the shape memory of the Nitinol material causes the distal ends of the leg to be drawn toward each other in response to heating of implant 100. Such heating of implant 100 may be accomplished with an external source (e.g., heat-activated), or as implant 100 is brought to room temperature or body temperature (e.g., body temperature-activated). Additional details related to a staple-style implant are disclosed in WO 2022 / 010920, which is incorporated herein by reference in its entirety. In other embodiments, the “shape memory” or biasing force applicable by implant 100 may be provided without heat treating the implant 100 as in the example described above.

[0060] Referring now to Figures 2-4, an embodiment of an insertion system 200 for holding, manipulating, and installing staple-style implant, such as the staple-style implant 100 of Figure 1 , is shown. As will be described in more detail below, system 200 can be operated by a surgeon or other user to securely to hold implant 100 such as during installation in bone segments 2, 4, and to selectively release implant 100 after installation in bone segments 2, 4. Generally, the system 200 of Figures 2-4 comprises an insertion device 220, and a retention block 230. As will be disclosed herein, the insertion device 220 may be described has having a first or closed configuration for securely gripping and holding implant 100 (e.g., for and during installation), and a second or open configuration for disengaging and releasing implant 100 (e.g. following installation). In Figures 2, 3, and 4 insertion system 200 is shown in a perspective view, a front view, and an exploded view, respectively.

[0061] Referring to Figure 4, the insertion device 220 generally includes a handle 410, a pair of retention springs 420 flexibly and pivotally coupled to handle 410, and a slider 430 slidably disposed about handle 410, retention springs 420, a central pin, and a cross pin 450.

[0062] Referring to Figure 5, the handle 410 is shown in isolation. Generally, the handle 410 generally comprises a rigid body having a central or longitudinal axis 415, a first end 410a, a second end 410b opposite end 410a, a front side extending axially from end 410a to end 410b, a rear side extending axially from end 410a to end 410b, and a pair of lateral sides extending axially from end 410a to end 410b. Each lateral side extends between sides and each side extend laterally between sides.

[0063] Generally, in this embodiment, the front side comprises a planar face or surface extending axially between ends 410a, 410b and rear side similarly comprises a planarface or surface extending axially between ends 410a, 410b. The front and rear surfaces are generally oriented parallel to each other and axis 415. In addition, in this embodiment, each lateral side includes one or more rounded and / or contoured surfaces extending axially from end 410a to end 410b. In some embodiments, the lateral surfaces may include one or more recesses and / or raised portions, for example, to improve grip of a user when using the insertion device 220, more particularly, when gripping the handle 410.

[0064] Handle 410 has a length measured axially from end 410a to end 410b, a width measured laterally and perpendicular to axis 415 between the lateral surfaces, and a thickness measured perpendicular to longitudinal axis 415 and the front and rear surfaces. The front surface and rear surface may be generally oriented parallel to each other, for example, such that the thickness of handle 410 is substantially uniform and constant moving axially between ends 410a, 410b. Generally, the lateral surfaces may taper inward moving from the first end 410a toward the second end 410b, for example, such that the width decreases moving from the first end 410a toward the second end 410b.

[0065] Still referring to Figure 5, the handle 410 may also comprise a plurality of recessed surfaces disposed toward the second end 410b, for example, a front recessed surface, a rear recessed surface, two side recessed profiles. As will be further disclosed herein, the recessed surfaces may be configured such that the slider 430 is able to be slidably engaged with the recessed surfaces, more particularly, so as to allow slidable movement axially (along the longitudinal axis 415) of the slider 430 with respect to the handle 410. As shown in the embodiment of Figure 5, the front and rear recessed surfaces may be parallel to each other and the longitudinal axis 415. Each of the recessed side profiles includes a first recessed surface and a second recessed surface meeting at a shoulder, with the second recessed surfaces being disposed relatively nearer the second end 410b of the handle 410. The first recessed surfaces of the two respective side profiles are parallel to each other and the longitudinal axis 415 and are axially aligned along the longitudinal axis 415. Likewise, the second recessed surfaces of the two respective side profiles are parallel to each other and are axially aligned along the longitudinal axis 415. As will be disclosed herein, the handle 410 may have a narrower width at the second recessed surfaces so as to allow for placement of the retention springs 420 adjacent to the second recessed surfaces. For example, when the retention springs 420 are coupled to thehandle 410, the retention springs 420 generally do not extend to a width greater than the width of the first recessed surfaces, such that the retention springs do not impede movement of the slider 430 with respect to the handle 410.

[0066] Continuing to refer to Figures 4 and 5, the handle 410 may be configured to receive the cross pin 450. As shown in Figures 4 and 5, the handle 410 comprises a lateral bore sized and configured to receive the cross pin 450. The cross pin 450 may extend entirely through the width of the handle 410 between each of the two second recessed surfaces. The cross pin 450 may be of sufficient length as to protrude outward from each of the two second recessed surfaces so as to engage the retention springs, as will be disclosed herein. For example, the cross pin 450 may have a length substantially the same as the width of the handle 410 at the first recessed surfaces.

[0067] Also, referring to Figures 4 and 5, the handle 410 may also be configured to receive the central pin 440. As shown in Figures 4 and 5, the handle 410 comprises a central bore sized and configured to receive a portion of the central pin 440 such that the central pin extends parallel the longitudinal axis 415 from the second end 410b of the handle 410. In some embodiments, the central bore may intersect the lateral bore, for example, such that the central pin 440 abuts the cross pin 450 when both are disposed within the handle 410.

[0068] Referring to Figure 6, the retention springs 420, cross pin 450, and central pin 440 are shown in isolation. In Figure 6, the retention springs 420 are shown engaging a staple-style implant. As shown in Figure 6, the retention springs 420 are pivotably engaged with the handle 410 via the cross pin 450.

[0069] Referring to Figures 7, 8, 9, and 10, the arms 425 of the retention spring are shown in various configurations. Particularly, Figures 7 and 8 show the arms 425 closed so as to engage a staple-style implant 100 and Figure 9 and 10 shown the arms open so as to not engage the implant 100.

[0070] Each of the arms 425 generally includes a first end 425a coupled to handle 410, and a second or free end 425b distal handle 410. In particular, the retention springs 420 each include a U-shaped section disposed at end 425a of the retention springs 420. The U-shaped section pivotably engages the cross pin 450 that is fixed to (inserted through) the handle 410 such that the retention springs cannot move axially along the handle 410.

[0071] The retention springs 420 also comprise a pair of arms 425, for example with each arm 425 being an integral component of the respective retention spring. Eacharm 425 is an elongate resilient structure extending over a central or longitudinal axis, which generally extends parallel to the longitudinal axis 415 of the handle 410 when the retention springs 420 are engaged with the handle 410 via the cross pin 450. Each arm 425 is at least partially seated in one of the recesses defined by the should and each of the second recessed surfaces. In particular, a portion of each arm 425 is disposed in a corresponding recess and a portion of each arm 425 extends axially from the corresponding recess at end 410b of handle 410. Retention springs 420 and recesses are sized and shaped to mate with each other such that the portions of retention springs 420 disposed in recesses and do not extend beyond surface the front and rear recessed surfaces or extend beyond the first recessed surfaces of each recessed side profile when fully seated within each of the recessed profiles.

[0072] The retention springs 420 may be made of a generally rigid metal (e.g., stainless steel) that extends generally linearly along the arms 425 and is bent at the U-shaped section. The retention springs 420 may be configured such that, when an external force is applied to the arms 425, the arms 425 can be elastically flexed inward with respect to each other (so that the jaws transition the closed position, as will be disclosed herein) and, when the external force is not applied, the arms 425 resiliently rebound from the flexed inward position to the relaxed position (so that the jaws transition to the open position, as will be disclosed herein).

[0073] Particularly, each end 425b includes a claw 426 for releasably engaging implant 100, and in particular, for releasably engaging a bridge portion of the implant 100. Each claw 426 has a shape and geometry to conform and mate with an end of the bridge 110. More specifically, each claw 426 is generally C-shaped in side view including a tip and a pocket axially adjacent tip. As will be described in more detail below, insertion device 220 is used to manipulate and install staple-style implant 100 in bone segments 2, 4. Each tip is sized such that it does not interfere with axial advancement of legs 130 into holes 14, 16 or the placement of lower surface 1 14 of implant immediately adjacent or in direct contact with bone segments 2, 4 when implant 100 is installed in bone segments 2, 4 and the claws 426 are engaged with the implant 100.

[0074] Generally, each claw 426 faces and is opposed one other claw 426 to receive one end of the bridge 110 therebetween. Each pair of opposed claws 426 define a jaw that releasably engages one end of bridge 110. As used herein, each individual claw 426 represents a component configured for structurally gripping an element, anda “jaw” comprises a pair of opposed claws 426 that function together to releasably engage one end of bridge 110.

[0075] As will be described in more detail below, each jaw has a closed position in which each jaw engages the bridge 110 is disposed between the tips, and an open position with the corresponding tips withdrawn and spaced from the bridge 110 is disposed between the tips. The first and second configurations of the insertion device 220 correspond to the closed and open positions of the jaws, respectively. When jaws are in the open positions, bridge 110 is released by jaws and is free to pass between tips so as to allow decoupling and physical separation of insertion device 220 and implant 100. It is to be understood that insertion device 220 is in a first configuration for securely gripping and holding implant 100 when jaws are in the closed positions, and insertion device 220 is in the second configuration for disengaging and releasing implant 100 when jaws are in the open positions.

[0076] As previously described, legs 130 of implant 100 are inwardly biased and / or manufactured such that the distal ends of the legs move toward each other upon the application of heat. Retention springs 420 are sized and claws 426 are axially positioned relative to handle 410 such that an upper surface of bridge 110 contacts a distal end of the central pin 440 (which is disposed within the handle 410) and ends of the bridge 110 are held in position by claws 426 such that a central axis of each of the legs 130 of the implant 100 are thereby oriented parallel to central axis 415 when jaws are in the closed positions and tips are fully seated against the bridge 110, for example, such that the curvature of bridge 110 is lessened.

[0077] Referring to Figure 11 and 12, in this embodiment, the axial movement of slider 430 relative to handle 410 and retention springs 420 selectively controls the transition of jaws between the open and closed positions. Figure 11 illustrates the slider 430 in an axially-extended position, such that the insertion device 220 is in the first configuration and Figure 12 illustrates the slider 430 in an axially-retracted position, such that the insertion device 220 is in the second configuration. As shown, in particular, slider 430 is slidably mounted to handle 410 and disposed about handle 410 and retention springs 420. Slider 430 has a central or longitudinal axis that, when disposed with respect to the handle 410, is coaxially aligned with the longitudinal axis 415. The slider 430 comprises a first end 430a, a second end 430b opposite first end 430a, and a through bore or passage extending axially from end 430a to end 430b. The radially inner surface of slider 430 that defines passage has a rectangular cross-sectional shape sized to conform with and slidingly engage the recessed profile of the handle 410. In other words, passage is sized and shaped so that slider 430 slidingly engages the various recessed surfaces of the handle 410. Slider 430 has a length measured axially (relative to axis 415) between ends 430a, 430b that is less than a length of the recessed portion of the handle 410 measured axially (relative to axis 415). Thus, slider 430 can be moved axially (relative to axis 415) along the recessed portion of the handle 410 away from end 410b and toward end 410a in a first axial direction, and moved axially (relative to axes 415) along recessed portion away from end 410a and toward end 410b in a second axial direction that is opposite first axial direction. As previously described, the arms 425 of the retention springs 420 are biased outwardly, and thus, as slider 430 moves axially away from end 410b in first axial direction, the arms 425 are permitted to resiliently move outwardly, thereby allowing jaws to transition to the open positions; likewise, as slider 430 moves axially toward end 410b in the second axial direction, slider 430 bears against arms 425, thereby transitioning jaws to the closed position.

[0078] Referring briefly to Figure 2, in this exemplary embodiment, the retention block 230 comprises a retention block body 240 and a retention block keystone 260 that is separate from the retention block body 240. Referring now to Figures 13, 14, and 15, the retention block body 240 of retention block 230 is shown. The retention block 240 generally comprises a flexible bridge 1310, an implant slot 1320, a pair of levers 1330. The retention block 240 may comprise a unitary structure, for example, being formed as a single component. Each of the pair of levers 1330 comprises a first end 1330a and a second end 1330b. The pair of levers 1330 are joined via the flexible bridge 1310 such that the alignment between the pair of levers 1330 may be manipulated, that is, such that the levers 1330 may be pivoted with respect to each other about the flexible bridge 1310, for example, by squeezing together the first ends 1330a of each of the levers 1330.

[0079] The implant slot 1320 is generally configured to receive a staple-style implant 100. For example, the implant slot 1320 may include a pair of leg slots 1322 generally configured to receive the legs 130 of the implant 100 and a bridge portion 1324 generally configured to abut the bridge 110 of the implant. As best shown in Figure 15, the each of the leg slots 1322 is disposed in the second end 1330b of one of the levers 1330.

[0080] Referring to Figures 16 and 17, the retention block body 240 may be used to orient a central axis of each of the legs 130 of the implant 100 are substantially in parallel, for example, such that the curvature of bridge 110 is lessened, so that the insertion tool 220 may be engaged with the implant 100 while the implant is so- configured. For example, in Figure 16, the implant 100 is loaded into the implant slot 1320 in a retracted conformation, for example, in which the distal ends of the legs 130 are relatively close together. With the implant 100 disposed within the implant slot 1320, the first ends 1330a of the levers 1330 may be squeezed together, as shown in Figure 17, such that the implant 100 moves into an expanded conformation, for example, in which a central axis of each of the legs 130 of the implant 100 are substantially in parallel, for example, such that the curvature of bridge 110 is lessened.

[0081] Generally, the retention block keystone 260 of retention block 230 may be configured to retain the retention block body 240 in a configuration in which the implant 100 is retained in the expanded conformation. Referring to Figure 18, the retention block keystone 260 generally comprises a base portion 1810 and a central pillar 1820. The base portion 1810 may include a pair of ramps disposed so as to be aligned with the retention springs 420, as will be disclosed herein. The central pillar 1820 may have a width such that, when the retention block keystone 260 is disposed between the second ends 1330b of the retention block body 240, the implant 100 within the retention block body 240 is retained in the expanded conformation, for example, as shown in Figure 19. The central pillar 1820 may comprise a tapered upper profile 1825, for example, which may aid in insertion of the retention block keystone 260 in the retention block body 240.

[0082] As previously described, insertion device 220 can releasably hold implant 100, and be used to position and install implant 100 in bone segments 2, 4 to enable to application of compression 18 across break 12. The installation of implant using insertion device 220 will now be described. Referring first to Figures 20 and 21 , implant 100 is loaded into the retention block body 240. In some embodiments, the retention block body 240 may be deformed, such as by pivoting the levers 1330 with respect to one another in order to manipulate the orientation of the leg slots 1322 with respect to one another, thereby enabling the implant 100 to be loaded into the implant slot 1320 without manipulating or deforming the implant 100.

[0083] With the implant 100 loaded into the retention block body 240, the retention block body 240 may be manipulated so as to deform the implant 100 into the expandedconformation, for example, in which the central axis of each of the legs 130 of the implant 100 are substantially in parallel and such that the curvature of bridge 110 is lessened. Referring to Figures 22 and 23, in some embodiments, the first ends 1330a of the levers 1330 may be squeezed together to thereby manipulate the implant 100 and, while holding the first ends 1330a of the levers 1330 together, the retention block keystone 260 may be placed between the second ends 1330b of the levers 1330 to retain the implant 100 in the deformed state, for example, in the expanded conformation. Particularly, the central pillar 1820 is disposed between the second ends 1330b of the levers 1330. Alternatively, referring to Figure 24, in some embodiments the retention block body 240 may be pushed downwardly over the retention block keystone 260, where the tapered upper profile 1825 urges the second ends 1330b of the levers 1330 apart, then the central pillar 1820 seats between the second ends 1330b of the levers 1330 to similarly retain the implant 100 in the deformed state.

[0084] With the implant 100 retained, by the retention block body 240 and retention block keystone 260, the insertion device 220 is provided in the second configuration, with the jaws in the open positions. Referring to Figures 25-29, the jaws are brought into proximity with the implant 100. The insertion device 220 is aligned with respect to the implant 100, particularly, such that the retention springs can be slipped into the ramps 1812 in the retention block keystone 260. With the insertion device 220 aligned with respect to the implant 100, the slider 430 may be advanced in the direction of the second end 410b of the handle 410 such that the jaws are moved into the closed position, thereby disposing the insertion tool 220 in the first configuration, more particularly, with jaws in the closed positions securely holding and gripping implant 100. As previously disclosed, with jaws in the closed positions, upper surface of bridge 110 bears against end of the central pin 440 disposed within the handle 410 and ends of bridge 110 are held in position by jaws with legs 130 oriented parallel to each other and central axes 415. Thus, legs 130 are oriented parallel to central axis 415.

[0085] Referring to Figures 30-32, with the implant held in the deformed state by the engagement of the insertion tool 220, the retention block keystone 260 may be removed, follow by removal of the retention block body 240. The implant 100 is then ready to be deployed.

[0086] Referring again to Figure 1 , and as also illustrated in Figures 33-38, holes 14, 16 are drilled parallel to each other in bone segments 2, 4, respectively, and positionedand spaced to receive legs 130. While maintaining insertion device 220 in the first configuration with jaws in the closed positions, insertion device 220 is used to position each leg 130 adjacent a corresponding hole 14, 16, with each leg 130 coaxially aligned with a corresponding hole 14, 16. Next, insertion device 220 is used to insert legs 130 into holes 14, 16 and advance legs 130 through holes 14, 16. Due to engagement of outer surfaces of legs 130 with bone segments 2, 4 and the interference fit therebetween, the user may use a mallet or other device to tap end 410a of handle 410 and drive legs 130 into holes 14, 16 until legs 130 are sufficiently set in holes 14, 16 and bridge 110, and more specifically lower surface 114 of bridge 110, engages or is in immediately adjacent bone segments 2, 4. With implant 100 sufficiently seated in holes 14, 16, the user of insertion device 220 transitions insertion device 220 to the second configuration with jaws in the open positions by sliding slider 430 axially along the recessed portion away from end 410b and toward end 410a. As jaws transition from the closed positions to the open positions, bridge 110 of implant is released by jaws. Once released, insertion device 220 is no longer applying forces to bridge 110 to maintain legs 130 in parallel orientations. Consequently, inwardly biased legs 130 generate and apply compressive loads 18 to break 12 and / or heat may be applied to implant 100 (body heat or external heat) to phase change implant 100 to enable legs 130 to apply or increase the application of compressive loads 18 to break 12.

[0087] Referring to Figures 39-42, another embodiment of a retention block 2000 for manipulating an orthopedic implant (e.g., staple-style implant 100) having a bridge and a plurality of legs. In this exemplary embodiment, retention block 2000 comprises a retention block body 2002 and a retention block keystone 2100 that is separate from the retention block body 2002. Retention block 2000 may be usable with an insertion device such as the insertion device 220. Additionally, retention block 2000 may include features in common with the retention block 230 shown in Figures 2-4, and shared features are labeled similarly.

[0088] The retention block body 2002 of retention block 2000 generally comprises a flexible bridge 2010, an implant slot 2020, and a pair of levers 2050. The retention block body 2002 of retention block 2000 may comprise a unitary structure, for example, being formed as a single component. Each of the pair of levers 2050 comprises a first end 2050a and a second end 2050b. The pair of levers 2050 are joined via the flexible bridge 2010 such that the alignment between the pair of levers 2050 may be manipulated, that is, such that the levers 2050 may be pivoted with respect to eachother about the flexible bridge 2010, for example, by squeezing together the first ends 2050a of each of the levers 2050. Additionally, a receptacle or slot 2012 is formed along the bridge 2010 for interfacing with the retention block keystone 2100 as will be discussed further herein.

[0089] The implant slot 2020 is generally configured to receive a staple-style implant 100 and, in some embodiments, may be configured similarly as the implant slot 1320 of the retention block body 240 shown in Figures 13 and 14. Additionally, with the implant 100 disposed within the implant slot 2020, the first ends 2050a of the levers 2050 may be squeezed together such that the implant 100 moves into the expanded conformation.

[0090] In some embodiments, retention block keystone 2100 is similar in configuration to the retention block keystone 260 shown in Figure 18. However, in this exemplary embodiment, retention block keystone 260 includes a cover portion 2110 located opposite base portion 1810 and is positioned over and couples with the central pillar 1820 of the retention block keystone 2100. A pair of receptacles 2120 are formed that flank the lateral sides of the central pillar 1820 and in which the second ends 2050b of levers 2050 are at least partially receivable. Additionally, the cover portion 2110 of retention block keystone 2100 includes a key 2130 that projects from an end thereof and which is receivable in the receptacle 2012 of retention block body 2002. The engagement between key 2130 of retention block keystone 2100 and receptacle 2012 of retention block body 2002 when retention block body 2002 is assembled with retention block keystone 2100 may ensure more consistent positioning and loading of the implant 100 therein.

[0091] Referring to Figures 43-48, another embodiment of a retention block 2000 for manipulating an orthopedic implant (e.g., staple-style implant 100) having a bridge and a plurality of legs. In this exemplary embodiment, retention block 2000 comprises a retention block body 2002 and a retention block keystone 2100 that is separate from the retention block body 2002. Retention block 2000 may be usable with an insertion device such as the insertion device 220. Additionally, retention block 2200 may include features in common with the retention block 230 shown in Figures 2-4, and shared features are labeled similarly.

[0092] As shown particularly in Figures 44 and 45, the retention block body 2202 of retention block 2200 generally comprises a flexible bridge 2210, an implant slot 2220 for receiving staple-style implant 100, and a pair of levers 2250. Each of the pair oflevers 2250 comprises a first end 2250a and a second end 2250b. The pair of levers 2250 are joined via the flexible bridge 2210 such that the alignment between the pair of levers 2250 may be manipulated, that is, such that the levers 2250 may be pivoted with respect to each other about the flexible bridge 2210.

[0093] In this exemplary embodiment, the second ends 2250b of levers 2250 are defined by medial surfaces 2260 that extend from second ends 2250b towards the bridge 2210 and along which are formed medially projecting shoulders 2262. Particularly, shoulders 2262 of levers 2250 project outwardly towards each other and may contact each other when retention block body 2202 is in an unflexed or relaxed state (shown in Figure 44) in which the first ends 2250a of levers 2250 are not squeezed together by a user thereof. However, a medial gap 2270 is formed centrally between the shoulders 2262 when retention block body 2202 is in a semi-flexed state as shown in Figure 45. Additionally, a first distance 2251 separates the first ends 2250a of levers 2250 when retention block body 2202 to lock the implant 100 into the implant slot 2220. Conversely, a second distance 2253 that is less than the first distance 2251 separates the first ends 2250a of levers 2250 when retention block body 2202 to release the implant 100 from the implant slot 2220

[0094] As shown particularly in Figures 46 and 47, the retention block keystone 2300 generally comprises a pair of opposing base portions 2310 and a central pillar 2330 located centrally and extending entirely between the pair of base portions 2310. In this exemplary embodiment, base portions 2310 each include a pair of inner grooves 2312 that extend longitudinally towards the central pillar 2330. Grooves 2312 of base portions 2310 may assist with aligning an insertion device (e.g., insertion device 220) into alignment with retention block keystone 2300 and guide the arms of an insertion device (e.g., arms 425 shown in Figures 7-10) into engagement with the implant 100 received in the retention block 2200. Additionally, the central pillar 2330 of retention block keystone 2300 defines a pair of opposing lateral surfaces 2340 extending between a proximal end 2331 and a longitudinally opposed distal end 2333 of central pillar 2330. In this exemplary embodiment, a first or proximal groove or receptacle 2342 and a second or distal groove or receptacle 2346 is formed along the lateral surfaces 2340 of central pillar 2330.

[0095] Retention block body 2202, with an implant load 100 loaded thereon, is slidably insertable into the retention block keystone 2300 to put retention block 2200 into an assembled state. Additionally, in this exemplary embodiment, retention block body2202 may occupy a a plurality of different positions relative to the retention block keystone 2300 when retention block 2200 is in the assembled state. Particularly, retention block body 2202 may be received in and couple with the retention block keystone 2300 in a first or proximal position corresponding to the semi-flexed state of retention block body 2202 as shown in Figures 46 and 47. In the proximal position of retention block body 2202, shoulders 2262 thereof are received in the proximal receptacles 2342 of retention block keystone 2300 which forces the retention block body 2202 into the semi-flexed state in which the implant 100 loaded thereon is similarly flexed with the legs 130 thereof extending generally parallel each other.

[0096] In some embodiments, the proximal position of retention block body 2202 corresponds to a storage configuration of the retention block 2200. For example, the retention block 2200 may be preassembled (e.g., at a manufacturing facility) into the storage configuration with an implant 100 loaded into the retention block 2200. The retention block 2200 may be packaged and shipped to a facility (e.g., a hospital) in the assembled state and occupying the storage configuration prior to use with an appropriate insertion device such as the insertion device 220.

[0097] Along with the proximal position, in the assembled state of retention block 2200, retention block body 2202 may also occupy a second or distal position relative retention block keystone 2300 that is spaced from the distal position. In the distal position of retention block body 2202, shoulders 2262 thereof are received in the distal receptacles 2346 of retention block keystone 2300 which forces the retention block body 2202 into a fully-flexed state as shown in Figure 48. In the fully-flexed state of retention block body 2202, the medial gap 2270 formed between shoulders 2262 is greater in width than when retention block body 2202 occupies the semi-flexed state such that the second ends 2250b of levers extend at an angle projecting away from each other along with the central axis of the retention block body 2202. Implant 100 loaded thereon is similarly flexed with the legs 130 thereof extending at an angle away from each other rather than generally parallel as when retention block body 2202 is in the semi-flexed state. The retention block body 2202 is forced into the fully-flexed state when occupying the distal position given that the width separating distal receptacles 2346 is greater than the width similarly separating the proximal receptacles 2342 of 2330 central pillar. The retention block body 2202 may be shifted between the proximal and distal positions by sliding the shoulders 2346 thereof alongthe lateral surfaces 2340 of the central pillar 2330 of retention block keystone 2300 while squeezing the first ends 2250a of levers 2250 of retention block body 2202.

[0098] In some embodiments, retention block body 2202 occupying the distal position with retention block 2200 in the assembled state corresponds to a loading configuration of the retention block 2200. Particularly, in the loaded configuration of retention block 2200, the implant loaded into retention block 2200 is ready to be captured and retrieved from the retention block 2200 by an appropriate insertion device such as insertion device 220. However, in other embodiments, the proximal position of retention block body 2202 may instead correspond to the loading configuration of retention block 2200.

[0099] Referring to Figures 49-51 , an exemplary method for capturing an implant 100 loaded onto retention block 2200 in the assembled state by insertion device 220 is shown. Initially, Figure 49 shows retention block body 2202 occupying the distal position with insertion device 220 inserted into the retention block 2200. Particularly, the arms 425 of insertion device are guided by slots 2312 of retention block keystone 2300 into proximity with the implant 100 received in the retention block 2200.

[0100] AS shown in Figure 50, with retention block body 2202 remaining in the distal position, the arms 425 of insertion device 220 may couple with or capture the implant 100. However, implant 100 remains secured to the retention block body 2202 while retention block body 2202 is in the distal position given that implant is flexed outwardly in this position and is thus not free to slide freely through the implant slot 2220 of retention block body 2202. As shown in Figure 51 , with implant 100 captured by insertion device 220, retention block body 2202 may be shifted from the distal position to the proximal position. With legs 130 of implant 100 extend generally parallel each other and are thus permitted to slide freely through the implant slot 2220 of retention block body 2202 such that implant 100 is now no longer secured to the retention block body 2202 and may be released therefrom. With retention block body 2202 located in the proximal position, insertion device 220 may remove the implant 100 from the retention block 2200 by a user thereof. Alternatively, the method illustrated by Figures 49-51 may instead be used to load an implant 100 into the retention block 2200 in the storage configuration for storage and / or shipping and prior to use by an end user. For instance, the implant 100 may be initially loaded into the retention block 2200 as shown in Figure 48. Subsequently, the retention block body 2202 is shifted from the distalposition to the proximal position such that the retention block 2200 occupies the storage configuration.

[0101] While exemplary embodiments have been shown and described, modifications thereof can be made by one skilled in the art without departing from the scope or teachings herein. The embodiments described herein are exemplary only and are not limiting. Many variations and modifications of the systems, apparatus, and processes described herein are possible and are within the scope of the disclosure. Accordingly, the scope of protection is not limited to the embodiments described herein, but is only limited by the claims that follow, the scope of which shall include all equivalents of the subject matter of the claims. Unless expressly stated otherwise, the steps in a method claim may be performed in any order. The recitation of identifiers such as (a), (b), (c) or (1 ), (2), (3) before steps in a method claim are not intended to and do not specify a particular order to the steps, but rather are used to simplify subsequent reference to such steps.

Claims

CLAIMSWhat is claimed is:1 . A retention block body for a retention block to manipulate an orthopedic implant having a bridge and a plurality of legs, the retention block body comprising: a flexible bridge; a pair of levers joined via the flexible bridge, each lever having a first end and a second end, wherein the pair of levers are pivotable with respect to each other about the flexible bridge; an implant slot configured to receive the orthopedic implant, the implant slot including: a pair of leg slots disposed in the second ends of the levers and configured to receive the legs of the orthopedic implant; and a bridge portion configured to abut the bridge of the orthopedic implant; wherein manipulation of the first ends of the levers transitions the orthopedic implant between a retracted conformation and an expanded conformation in which a central axis of each of the legs are substantially parallel.

2. The retention block body of claim 1 , wherein the retention block body comprises a unitary structure formed as a single component.

3. The retention block body of claim 1 , wherein the flexible bridge is configured to allow the pair of levers to be pivoted with respect to each other by squeezing together the first ends of the levers.

4. The retention block body of claim 1 , wherein each of the leg slots is disposed in the second end of one of the levers, and the leg slots are configured to manipulate orientation with respect to one another when the levers are pivoted.

5. The retention block body of claim 1 , wherein the retention block body is configured to be deformed to enable the orthopedic implant to be loaded into the implant slot without manipulating or deforming the orthopedic implant.

6. The retention block body of claim 1 , wherein the second ends of the pair of levers are defined by medial surfaces having outwardly projecting shoulders formed thereon.

7. The retention block body of claim 1 , wherein: the retention block body has a first state in which the first ends of the pair of levers are spaced by a first distance, and a second state in which the first ends of the pair of levers are spaced by a second distance that is different from the first distance; and the retention block body is configured to lock the orthopedic implant into the implant slot when occupying the first state and to release the orthopedic implant from the implant slot when occupying the second state.

8. The retention block body of claim 7, wherein the first distance is greater than the second distance.

9. A retention block keystone for a retention block to retain an orthopedic implant in an expanded conformation, the retention block keystone comprising: a base portion including a pair of ramps; and a central pillar extending from the base portion and having a width configured to retain the orthopedic implant in the expanded conformation when the retention block keystone is disposed between second ends of a pair of levers of a retention block body; wherein the central pillar comprises a tapered upper profile configured to aid insertion of the retention block keystone between the second ends of the levers.

10. The retention block keystone of claim 9, wherein the pair of ramps are disposed so as to be aligned with retention springs of an insertion device.11 . The retention block keystone of claim 9, wherein the central pillar has a width such that when the retention block keystone is disposed between the second ends of the pair of levers, the orthopedic implant is retained in the expanded conformation.

12. The retention block keystone of claim 9, wherein the tapered upper profile is configured to urge the second ends of the levers apart when the retention block body is pushed downwardly over the retention block keystone.

13. The retention block keystone of claim 9, wherein the central pillar is configured to seat between the second ends of the levers to retain the orthopedic implant in a deformed state.

14. The retention block keystone of claim 9, wherein the central pillar is defined by an opposing pair of lateral sides and wherein a first receptacle is formed along both of the pair of lateral sides.

15. The retention block keystone of claim 14, wherein a second receptacle is formed along both of the pair of lateral sides that is spaced from the first receptacle.

16. A system for manipulating and retaining an orthopedic implant, the orthopedic implant including a bridge and a plurality of legs, the system comprising: a retention block body, comprising: a flexible bridge; a pair of levers joined via the flexible bridge and pivotable with respect to each other; and an implant slot configured to receive the orthopedic implant; a retention block keystone comprising: a base portion; and a central pillar configured to be disposed between second ends of the levers to retain the orthopedic implant in an expanded conformation; wherein the retention block body is configured to transition the orthopedic implant from a retracted conformation to the expanded conformation, and the retention block keystone is configured to maintain the orthopedic implant in the expanded conformation.

17. The system of claim 16, wherein the retention block body comprises a unitary structure, and the flexible bridge allows the pair of levers to be pivoted with respect to each other about the flexible bridge.

18. The system of claim 16, wherein the central pillar comprises a tapered upper profile configured to aid insertion of the retention block keystone between the second ends of the levers.

19. The system of claim 16, wherein the base portion of the retention block keystone includes a pair of ramps configured to be aligned with retention springs of an insertion device.

20. The system of claim 16, wherein the orthopedic implant includes a bridge and a plurality of legs, and the expanded conformation is characterized by a central axis of each of the legs being substantially parallel such that curvature of the bridge is lessened.

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