An instrument and system including a humerus cutting guide assembly for shoulder replacement surgery in orthopedics

Abstract

An instrument assembly for an orthopaedic surgical procedure is disclosed. The instrument assembly may optionally include one or a combination of a reamer and a cutting guide assembly. The cutting guide assembly may be configured to couple to the reamer. The cutting guide assembly may optionally include one or a combination of a clamp, a carriage, and a cutting block. The clamp may be selectively movable along and lockable to a shaft of the reamer. A first arm may protrude from the reamer. The carriage may be selectively movable along a longitudinal length of the first arm. The cutting block may be coupled to the carriage via one or more magnets.

Description

Technical Field

[0001] Cross - reference to Related Applications This application claims the benefit of U.S. Provisional Patent Application No. 63 / 165,963, filed on March 25, 2021, the benefit of its priority is claimed herein, and the entire disclosure thereof is incorporated herein by reference in its entirety.

Background Art

[0002] The shoulder joint is a complex joint where the scapula, clavicle, and humerus are all joined together as a unit, and in at least a properly functioning joint, allows a wide range of motion. In a properly functioning shoulder joint, the humeral head normally fits into a shallow socket of the scapula, commonly called the glenoid fossa. The articular movement of the shoulder joint involves the movement of the humeral head within the glenoid fossa, and the structure of the articular surfaces and surrounding tissues allows a wide range of motion.

[0003] The shoulder joint can be subject to degenerative changes resulting from various problems such as rheumatoid arthritis, osteoarthritis, rotator cuff arthropathy, avascular necrosis, or fractures. In cases where severe joint damage occurs and no other effective treatment means are found, total shoulder replacement, partial replacement, or reverse - type joint replacement or reconstruction may be necessary. Total shoulder replacement may involve an artificial humerus including a stem and a head portion used to replace the natural humeral head. Total shoulder replacement also generally involves resurfacing of the glenoid fossa with an artificial implant. The glenoid implant generally includes a joint cup having a shape to receive the artificial humeral head. Reverse - type shoulder replacement (arthroplasty) involves various sets of humerus and glenoid replacement prostheses. In a reverse - type shoulder joint, the humeral component includes a cup - shaped articular surface attached to a stem implanted into the humerus, and a spherical glenoid component is used to provide an articular surface for the humeral cup.

Summary of the Invention

Problems to be Solved by the Invention

[0004] To facilitate the implantation of the humeral component, various techniques for excising the humeral head have been developed. One such technique is to attach a cutting block using an intramedullary rod or reamer to facilitate the excision of the humeral head. One problem solved by the system and instrument of the present invention is the known instrument assembly that utilizes a number of knobs and wing screws. These knobs and wing screws can be cumbersome to loosen to manipulate the cutting block to various desired positions. Also, once the cutting block is positioned at the desired location, it must be tightened again. Further, previous systems and instruments restricted the movement of the cutting block so that it could only be moved along one direction (usually along the boom arm). This can leave an undesirable gap between the cutting block surface and the humeral surface. However, the instrument and system of the present invention enable the cutting block used by a surgeon during humeral excision to be repositioned more flexibly. The rotational movement of the cutting block can be achieved by the instrument and system of the present invention. This can improve the surgeon's ability to adjust the cutting block to assist in humeral excision. Other instruments of the system are disclosed, which provide other advantages to the surgeon, such as improving efficiency by reducing complexity and reducing the time to perform the procedure. For example, the system and instrument of the present invention provide pins that can be angled relative to each other and pins that can be placed on the resection surface. These configurations can better fix the cutting block to the humerus and reduce the possibility that the block vibrates or shifts position during the performance of the guided resection. **Means for Solving the Problem**

[0005] Example 1 is an instrument assembly for orthopedic procedures. The instrument assembly can optionally include either a reamer and / or a cut guide assembly. The cut guide assembly can be configured to couple to the reamer. The cut guide assembly can optionally include any one or a combination of a clamp, a carriage, and a cut block. The clamp is selectively movable along the shaft of the reamer and can be locked to the reamer. The first arm can project from the reamer. The carriage can be selectively movable along the longitudinal length of the first arm. The cut block can be coupled to the carriage via one or more magnets.

[0006] Example 2 is the instrument assembly of Example 1, wherein the clamp optionally includes a leaf spring configured to flex when selectively engaging the shaft of the reamer.

[0007] Example 3 is the instrument assembly of either Example 1 or Example 2, or a combination thereof, wherein the clamp optionally includes a plunger configured to engage the shaft of the reamer and a lever configured to actuate movement of the plunger to engage and disengage from the shaft of the reamer.

[0008] Example 4 is the instrument assembly of Example 3, wherein the plunger is optionally positioned within and movable relative to the first arm, and the lever is optionally positioned at the longitudinal end of the first arm opposite the reamer.

[0009] Example 5 is the instrument assembly of any one or any combination of Examples 1 to 4, wherein the carriage optionally includes a spring finger configured to engage the first arm.

[0010] Example 6 is an instrument assembly according to any one or any combination of Examples 1 to 5, wherein the carriage optionally includes a second arm protruding away from the first arm and a retainer configured to receive one or more magnets therein.

[0011] Example 7 is an instrument assembly according to Example 6, wherein the one or more magnets optionally include button magnets.

[0012] Example 8 is an instrument assembly according to any one or any combination of Example 6 or Example 7, optionally further comprising one or more inversion cups configured to receive one or more magnets therein.

[0013] Example 9 is an instrument assembly according to Example 8, optionally further comprising one or more corrugated springs configured to bias one or more magnets against the lid of the one or more inversion cups.

[0014] Example 10 is an instrument assembly according to any one or any combination of Examples 6 to 9, wherein the retainer optionally has a plurality of rails and grooves configured to engage a plurality of rails and grooves of a corresponding cut block.

[0015] Example 11 is an instrument assembly according to any one or any combination of Examples 1 to 10, wherein the cut block is optionally configured to be rotatable relative to the carriage.

[0016] Example 12 is an instrument assembly according to any one or any combination of Examples 1 to 11, optionally further comprising a plurality of rods configured to indicate the orientation of the cut guide assembly.

[0017] Example 13 is an instrument system for orthopedic procedures. The instrument system can optionally include either a reamer and / or a cut guide assembly. The cut guide assembly can optionally be configured to couple to the reamer. The cut guide assembly can optionally include any one or a combination of a first arm, a clamp, a carriage, and a cut block. The clamp can be configured to move along the shaft of the reamer. The clamp is optionally configured to be positioned within the first arm and includes a leaf spring configured to flex when selectively engaged with the shaft of the reamer to fix the clamp to the shaft. The carriage can be configured to move along the arm. The cut block can be configured to engage with the carriage.

[0018] Example 14 is the instrument system of Example 13, optionally further comprising one or more magnets configured to couple the cut block to the carriage.

[0019] Example 15 is the instrument system of either Example 13 or Example 14, or a combination thereof, wherein the carriage optionally has a plurality of rails and grooves configured to engage a plurality of rails and grooves of a corresponding cut block.

[0020] Example 16 is the instrument system of any one or a combination of Examples 13 to 15, wherein the cut block is optionally configured to be rotatable relative to the carriage.

[0021] Example 17 is the instrument system of any one or a combination of Examples 13 to 16, optionally further comprising one or more inversion cups configured to receive one or more magnets therein, and one or more corrugated springs configured to bias one or more magnets against a lid of the one or more inversion cups.

[0022] Example 18 is a method of excising the humeral head. The method can optionally include any one or a combination of: inserting a reamer into the humerus, adjusting the proximal-distal position of the reamer and the cutting block assembly with respect to the humerus, clamping the cutting block assembly to the reamer when the desired proximal-distal position of the cutting block with respect to the humerus is obtained, adjusting the anterior-posterior position of the cutting block, and adjusting the rotational position of the cutting block.

[0023] Example 19 is the method of Example 18, optionally further including attaching the cutting block to the cutting block assembly via one or more magnets.

[0024] Example 20 is the method of either Example 18 or Example 19, or a combination of both, wherein clamping the cutting block assembly to the reamer optionally includes engaging a leaf spring with the reamer and deflecting the leaf spring laterally with respect to the reamer.

[0025] Each of the above non-limiting examples can exist alone or can be combined in various permutations or combinations with one or more of the other examples.

[0026] The above summary is intended to present an overview of the content of this patent application. It is not intended to present an exclusive or exhaustive description of the invention. The detailed description is included to provide further information regarding this patent application.

Brief Description of the Drawings

[0027] The drawings are not necessarily drawn to scale, but like reference numerals can indicate like components in different drawings. Like reference numerals with different suffixes may represent different examples of like components. The drawings generally illustrate, by way of example and not limitation, the various embodiments discussed in this specification.

[0028]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5A

Figure 5B

Figure 6A

Figure 6B

Figure 7

Figure 7A

Figure 7B

DETAILED DESCRIPTION OF THE INVENTION

[0029] As discussed herein, orthopaedic systems and devices are disclosed herein that facilitate resection and / or sizing of tissue. Although described with reference to the humerus, the devices and systems of the present application are applicable to other bones or bone portions, including, for example, the femur or tibia.

[0030] FIG. 1 shows a system 100 including a cut guide assembly 101 according to one embodiment. The cut guide assembly 101 can be used to resect the head 102 of the humerus 104, as illustrated and described herein. The system 100 can further include a reamer 106 and other components, as further discussed herein. The cut guide assembly 101 can be attached to the humerus 104 via the reamer 106. The cut guide assembly 101 can include various components, including a clamp 108, a first arm 110, a carriage 112, a cut block 114, and indicia 116.

[0031] As shown in FIG. 1, the reamer 106 can be inserted into the humerus 104 along the longitudinally extending intramedullary recess of the humerus. The clamp 108 can be configured to couple the remaining portion of the cutting guide assembly 101 to the reamer 106. The first arm 110 can be coupled to one or more portions of the clamp 108. The first arm 110 can project from the reamer 106 in a cantilevered fashion. The carriage 112 can be coupled to the first arm 110. The carriage 112 can be selectively movable along the longitudinal length of the first arm 110. The carriage 112 can include a portion that extends generally distally and posteriorly from the first arm 110 toward the head 102 of the humerus 104. The cut block 114 can be coupled to the carriage 112 at an end of the carriage opposite the end coupled to the first arm 110. As further discussed herein, the cut block 114 can be selectively rotatable relative to the carriage 112. Such a configuration of the cut block 114 can be readily achieved by one or more magnets and / or other mechanisms, as further discussed herein. The indicator 116 can include one or more rods 118 that can be attached to indicate the inward orientation of the cutting guide assembly 101. One of the one or more rods 118 can be tilted, for example, to align with the patient's lower forearm.

[0032] The clamp 108 can be selectively movable along the shaft of the reamer 106 and lockable thereto. As shown in FIG. 1, the clamp 108 can include a shaft clamp 120 and a locking mechanism 122. The shaft clamp 120 can comprise a sleeve or C-clamp type device configured to receive a portion of the reamer 106. The shaft clamp 120 can be dimensioned to be movable along the shaft of the reamer 106. The locking mechanism 122 can extend through the shaft clamp 120 to selectively engage the reamer 106, as further discussed and illustrated herein. The clamp 108 can connect the clamp 108 and the remaining portion of the cut guide assembly 101 to the reamer 106 via the locking mechanism 122 when the desired position is obtained.

[0033] The shaft clamp 120 can be connected to the first arm 110. According to some embodiments, such a connection can be an integral connection or a welded connection. However, other types of connections such as keyways, fasteners, etc. are envisioned. According to some embodiments, the first arm 110 can have an open frame design and can be configured to receive a portion of the locking mechanism 122 therein, as further discussed later. The first arm 110 can extend radially outwardly from the reamer 106 to the open end.

[0034] The carriage 112 is movable relative to the first arm 110 along its longitudinal length. The carriage 112 can include a bracket 124, a second arm 126, and a retainer 128. The bracket 124 can comprise an open-end mechanism configured to receive the first arm 110. The bracket 124 can include a connection mechanism configured to fix the position of the carriage 112 relative to the first arm 110, as further discussed herein. The second arm 126 can be coupled to the bracket 124 and can extend outwardly from the bracket 124 and from the first arm 110. The second arm 126 can be configured to be spaced apart and disposed distally generally parallel to the longitudinal length of the reamer 106. The second arm 126 can be coupled to the retainer 128. The retainer 128 can be selectively positioned by the clamp 108 and the carriage 112 such that it is positioned generally outwardly (front portion) of the head 102 of the humerus 104 as shown in FIG. 1.

[0035] The retainer 128 can be configured to capture the cut block 114 therein and attach the cut block 114. However, the retainer 128 can be configured to movably capture the cut block 114. For example, the cut block 114 can be rotatable relative to the retainer 128 and other portions of the carriage 112, as further discussed herein.

[0036] As shown in FIG. 1, the system 100 can include a plurality of pins 130 or other mechanisms such as bone screws. These can be configured to be pushed or otherwise inserted into the head 102 of the humerus 104 by a driver 132 or other instrument. The plurality of pins 130 can be directed by slots or openings in the cut block 114 as shown.

[0037] With the components and mechanisms described herein, the cut guide assembly 101 can be selectively moved along the reamer, as indicated by arrow A1. The carriage 112 and the remainder of the cut guide assembly 101 can be moved along the first arm 110, as indicated by arrow A2. The cut block 114 can be rotated and moved relative to the carriage 112 and the humerus 104, as indicated by arrow R1. In particular, the cut block 114 can be restrained to move toward and away from the bone 102, as guided by the retainer 128, as further discussed herein. Additionally, the cut block 114 can be rotated relative to the retainer 128.

[0038] FIG. 2 shows an enlarged cross-sectional view of a portion of the first arm 110 and the carriage 112. FIG. 2 shows a bracket 124 that can include a spring finger 134. The spring finger 134 can be biased or otherwise configured to interfere with or otherwise engage the first arm 110. Thereby, a certain amount of friction can be imparted to the first arm 110. Such an arrangement can improve the vibration resistance of the carriage 112. The spring finger 134 can engage the outer surface of the arm 110. Using the spring finger 134, the carriage 112 can be locked or engaged with the first arm 110. Thereby, the relative positioning between the two components can be maintained. The carriage 112 can be moved relative to the first arm 110 by disengaging the spring finger 134 from engagement with the first arm 110. Thereby, the bracket 124 can be slid or otherwise moved along the longitudinal length of the first arm 110.

[0039] Figure 3 is a perspective view of clamp 108 and first arm 110, having some components of clamp 108, particularly the disassembled lock mechanism 122. As previously described and as shown, clamp 108 can include a shaft clamp 120 configured to receive a reamer. Figure 3 shows that first arm 110 has an open frame design with a cavity 136 formed by the walls of the frame.

[0040] Lock mechanism 122 can include a lever 138, a leaf spring 140, and a plunger 142. Lever 138 can be coupled to leaf spring 140 by a pin 144 or other known mechanism or fastener such as a bolt at its first end. Lever 138 can also be movably rotatable relative to first arm 110 and can be coupled thereto for rotation via a second pin 146 or the like. Lever 138 can be configured as a grippable handle. Lever 138 can be configured to actuate leaf spring 140 and plunger 142, as will be further described. According to some embodiments, lever 138 can be configured as a cam mechanism for engaging plunger 142 with reamer 106 (Figure 1).

[0041] As shown in Figure 3, leaf spring 140 can be an elongated rod or member having a relatively thin side thickness compared to its longitudinal length. Leaf spring 140 can be configured to be received within cavity 136 of first arm 110. Leaf spring 140 can be slightly curved along its longitudinal length. By curving leaf spring 140, the engagement of plunger 142 with the reamer can be increased, as will be further shown.

[0042] Plunger 142 can be connected to leaf spring 140 at its second end. This second end can be opposite to the first end connected to lever 138. Plunger 142 can be configured to selectively engage the reamer, as will be further exemplified. By the engagement of the plunger with the reamer, the position of clamp 108 and arm 110 relative to the reamer can be locked, as previously described.

[0043] Figures 4 through 5B illustrate the operation of the clamp 108, particularly the locking mechanism 122. In Figures 4 through 5B, a portion of the first arm 110 and the carriage 112 have been removed to better illustrate the operation of the locking mechanism 122. Figures 4 and 5B show the locking mechanism 122 in the locked position, and the lever 138 is rotated to engage the plunger 142 with the shaft 105 of the reamer 106. Figure 5A shows the locking mechanism 122 in the unlocked position, and the lever 138 is rotated to disengage the plunger 142 from engagement with the shaft 105 of the reamer 106.

[0044] In Figure 5A, the lever 138 is in the unlocked position, and the plunger 142 is positioned via the leaf spring 140 so as to be spaced from the shaft 105 of the reamer 106. In Figure 5B, the lever 138 is rotated to the locked position, moving the plunger 142 to engage with the shaft 105 of the reamer 106.

[0045] Furthermore, as shown in Figure 5B, in the locked position, the leaf spring 140 can curve or flex laterally outward with respect to its longitudinal length as compared to the unlocked position. The configuration of the leaf spring 140 allows for a more smooth or repetitive force to be applied to the reamer 106, reducing and / or smoothing the operating force applied to rotate the lever 138. The configuration of the clamp 108, particularly the use of the leaf spring 140, facilitates a vibration-resistant connection with the shaft 105 of the reamer 106. The clamp 106 is configured such that the reamer 106 does not sway or experience a change in tension when the cut guide assembly is exposed to the vibrating saw blade.

[0046] Pin 144 can fix the leaf spring 140 to the lever 138 at the first end. The first arm 110 and / or the carriage 112 can be provided with a stopper 150 to hold and / or stop the lateral deflection of the leaf spring 140. The shaft clamp 120 can have a passage 152 therein. The passage 152 can be configured to receive and hold the plunger 142 (i.e., the second end of the leaf spring 140) even when the middle part of the leaf spring 140 is bent as shown in FIG. 5B. The passage 152 extends through the shaft clamp 120 so that the plunger 142 can selectively engage with the shaft 105 of the reamer 106.

[0047] Figures 6A and 6B show the carriage 112 in more detail. The interface surface between the carriage 112 and the cut block 114 can include a pair of interface surfaces designed to couple the two components. One interface surface can be a mechanical interface surface and one can be a magnetic interface surface. The mechanical interface surface can be between the opposing undercuts (rails) at the bottom of the carriage 112 and a pair of lips closely fitted on the cut block 114 (FIG. 7B). These mechanisms can accurately position the cut block 114 at the exact angle set by the carriage 112. Basically, these interface surfaces can set the cut surface as defined by the top part of the cut block 114. However, these mechanisms allow the cut block 114 to rotate freely in the plane and / or slide (or move in other ways) back and forth. However, the cut block 114 can be constrained to move only within this plane as defined by the orientation of the carriage 112 and the rail (see below). The magnetic interface surface can hold the cut block 114 against the mating surface of the carriage 112, and the force is defined by the magnetic field strength of the magnet(s) embedded in the carriage 112.

[0048] FIG. 6A shows the components described above, including the bracket 124, the second arm 126, and the retainer 128. FIGS. 6A and 6B further show the components and mechanisms of the retainer 128. Accordingly, FIGS. 6A and 6B show one or more magnets 154, one or more inversion cups 156, and one or more corrugated springs 158. The retainer 128 can include one or more recesses 159, one or more rails 162, and one or more grooves 164.

[0049] As shown in FIG. 6B, the retainer 128 can have one or more recesses 159 configured to receive one or more magnets 154, one or more inversion cups 156, and one or more corrugated springs 158. The one or more recesses 159 can be configured to position an assembly of one or more magnets 154, one or more inversion cups 156, and one or more corrugated springs 158 below or in the same plane as the surface 161 of the retainer 128.

[0050] The one or more inversion cups 156 can be configured to receive one or more magnets 154 therein. The one or more inversion cups 156 can be fixed inside the one or more recesses 159 by welding or other means. The corrugated spring 158 can be seated at the bottom of the recess 159 and configured to bias one or more magnets 154 against an inner lid of the one or more inversion cups 156, as shown in FIG. 6B.

[0051] The retainer 128 can have the shape of a track with opposing open ends. One or more rails 162 and one or more grooves 164 can be positioned laterally with respect to these openings. One or more grooves 164 can be positioned distal to one or more rails 162 adjacent to the surface 166. One or more rails 162 can have a hook shape for coupling with the female mechanism of the mating cut block. Similarly, one or more grooves 164 can have a shape that receives and engages with the male mechanism of the cut block. The shape of one or more grooves 164 and one or more rails 162, and in fact the retainer 128, can enable generally front-to-back adjustment of the cut block. Further, one or more magnets 154, one or more grooves 164 and one or more rails 162 can be configured to enable rotational adjustment of the cut block as previously discussed and illustrated in relation to FIG. 1.

[0052] FIGS. 7 through 7B show the cut block 114 in more detail. The cut block 114 can be oriented by the remainder of the cut guide assembly to be adjacent to (including slightly spaced from or abutting the bone head 102) the humerus 104. In particular, the cut block 114 can be oriented anterior to the bone head 102 and distal to a portion of the bone head 102. The cut block 114 is shown as being diagonally oriented extending proximally-distally and medially-laterally in FIGS. 7 and 7A, although various orientations of the cut block 114 are envisioned. As previously described, the cut block 114 can be rotatable with respect to the humerus 104, the reamer 106, and the other portions of the cut guide assembly 101 as previously described and illustrated. It should be noted that according to some embodiments, the cut block 114 can be pinned as shown in FIGS. 7 through 7B such that the remainder of the cut guide assembly 101 can be removed.

[0053] The cutting block 114 can include one or more parts made of an iron-based material or can be entirely made of an iron-based material. Alternatively, the cutting block 114 can include one or more magnets configured to be attracted to one or more magnets of the carriage. As shown in FIGS. 7 to 7B, the cutting block 114 can have a shape that is adjustable for 360-degree rotation. Thus, in some embodiments, as shown in FIGS. 7 and 7B, the interface side 170 of the cutting block 114 with the bone can be rotated 180 degrees so as to reverse to a direction opposite to the bone side. In this case, the opposite side 172 of the cutting block 114 becomes the interface side with the bone. The cutting block 114 can also be configured to be usable for either the left upper arm bone or the right upper arm bone.

[0054] As shown in FIGS. 7 to 7B, the cutting block 114 can include a proximal surface or resection surface 174 and a plurality of openings 176. The plurality of openings 176 can be configured to receive the pins 130 or other mechanisms as shown in FIGS. 7 and 7A. Some of the plurality of openings 176 can have openings with respect to the proximal surface or resection surface 174 that allow a part of the fixation pin to be exposed at the proximal surface or resection surface 174. These exposed pins can assist in guiding the resection of the humeral head 102 as shown in FIG. 7A. In particular, the upper tangent plane of all the pins together with the proximal surface or resection surface 174 can form a single continuous and step-free plane so that the saw blade can cross during cutting.

[0055] As shown in FIG. 7B, a number of the plurality of apertures 176 can be recessed a desired distance from the resection or proximal surface 174. A variety of aperture orientations are envisioned, including apertures that cross each other or are non-aligned. These (non-parallel) spreading apertures can act to hold the cutting block 114 against the humerus relative to the oscillating saw blade. FIG. 7B further shows a base 178 having mating mechanisms such as one or more grooves 164 for the retainer 128 (FIGS. 6A and 6B) and lips 180 for one or more rails 162 to facilitate connection.

[0056] The clamp 108 can eliminate the need for a threaded thumbscrew or other mechanisms commonly used in conventional cut guide assemblies. Once the cut block 114 is pinned in place, the clamp 108 can be loosened in a single operation. This allows the remainder of the cut guide assembly 101, excluding the cut block, to be removed without the need to loosen or disengage other components as in a conventional cut guide assembly. The spring finger 134 can eliminate the need for another thumbscrew or other mechanisms commonly used in conventional cut guide assemblies. One or more magnets, in conjunction with the one or more grooves 164 and one or more rails 162 of the retainer 128, can eliminate the need for another thumbscrew or other mechanisms commonly used in conventional cut guide assemblies. The fit between the one or more rails 162 of the retainer 128 and the cut block 114 allows the cut block 114 to slide adjacent to the humerus, minimizing the gap between the cut block 114 and the bone 102 as much as possible. Some of the plurality of openings 176 having an opening leading to the resection surface or proximal surface 174 of the cut block 114 extend the top of the fixation pin as an extension of the cut block 114 into the bone itself, thereby improving the flatness and accuracy of the resection. The plurality of openings 176 leading to the resection surface or proximal surface 174 also serve as a "flatness gauge" for the cut by allowing the surgeon to view any area of the resection where the pin side is not visible in order to "polish" the re-cut or resection with a saw blade until the resection is flat. The indicator 116, including the rod, can be quickly and efficiently attached to any instrument within the system 100 that needs to reference the patient's forearm to set or check for backset. These components are versatile in that they can be used together for a 20 / 30 / 40 degree combination backset setup for either left- or right-handed surgeons, and the central 30-degree rod can also be used alone as needed.

[0057] Note The above description includes references to the accompanying drawings which form a part of the detailed description. The drawings illustrate, by way of example, specific embodiments in which the invention can be practiced. These embodiments are also referred to herein as "examples". Such examples may include elements other than those illustrated or described. However, the inventor also contemplates examples in which only the elements illustrated or described are presented. Further, the inventor contemplates examples (or one or more "examples") in which any combination or permutation of the elements illustrated or described is used, either with respect to a particular example (or one or more of its "examples") or with respect to other examples (or one or more of their "examples") shown or described herein.

[0058] In the event of any conflict in the use between this document and the documents incorporated by reference, the use of this document shall govern.

[0059] In this document, the singular articles are used to include one or more, apart from other instances or uses of "at least one" or "one or more", as is common in patent documents. In this document, "or" is used to mean non-exclusive, unless otherwise indicated, such that "A or B" includes "not B but A", "not A but B", and "A and B". In this document, "including" and "in which" are used as plain English for "comprising" and "in which", respectively. Also, in the following claims, "including" and "comprising" are without limitation, i.e., systems, devices, articles, compositions, formulas or processes that include other elements in addition to the elements listed after this term in the claims are considered to be within the scope of that claim. Further, in the following claims, "first", "second", and "third" are used as mere labels and are not intended to impose numerical requirements on their objects.

[0060] Geometric terms such as "parallel", "right-angled", "round", or "square" are not intended to require absolute mathematical precision unless otherwise indicated in the context. These geometric terms allow for variations due to manufacturing or similar actions. For example, when describing an element as "round" or "substantially round", components that are not exactly circular (e.g., slightly oval or polyhedral) are also included in this description.

[0061] The above description is intended to be illustrative rather than limiting. For example, the above-described embodiments (or one or more of them) can be used in combination with each other. Other embodiments can be used by those skilled in the art and the like upon reading the above description. The "Abstract" is submitted in accordance with 37 C.F.R. § 1.72(b) to enable the reader to quickly confirm the nature of the technical disclosure. The "Abstract" is provided on the understanding that it is not to be used to interpret or limit the scope or meaning of the claims. Also, in the above "Detailed Description (Modes for Carrying Out the Invention)", various features may be grouped together to simplify the disclosure. This should not be construed as intending that the features disclosed without claim are essential to the claims. Rather, the subject matter of the invention may lie in less than all of the features of a particular disclosed embodiment. Accordingly, the following claims are incorporated as examples or embodiments into the "Detailed Description", each claim being independent as a separate embodiment, and such embodiments are assumed to be combinable with each other in various combinations or permutations. The scope of the present invention should be determined with reference to the claims, together with the full scope of equivalents to which the claims are entitled. According to aspect (1), an instrument assembly for orthopedic procedures, comprising: a reamer; a cut guide assembly configured to be coupled to the reamer, the cut guide assembly comprising: a clamp selectively movable along and lockable to the shaft of the reamer; a first arm protruding from the reamer; a carriage selectively movable along the longitudinal length of the first arm; a cutting block coupled to the carriage via one or more magnets; a cut guide assembly; an instrument assembly. According to aspect (2), the clamp includes a leaf spring configured to flex when selectively engaging the shaft of the reamer. According to aspect (3), the clamp includes a plunger configured to engage the shaft of the reamer and a lever configured to actuate the movement of the plunger to engage and disengage from the shaft of the reamer. According to aspect (4), the plunger is positioned within and movable relative to the first arm, and the lever is positioned at a longitudinal end of the first arm opposite the reamer. According to aspect (5), the carriage includes a spring finger configured to engage the first arm. According to aspect (6), the carriage includes a second arm protruding away from the first arm and a retainer configured to receive the one or more magnets therein. According to aspect (7), the one or more include button magnets. According to aspect (8), further comprising one or more inversion cups configured to receive the one or more magnets therein. According to aspect (9), further comprising one or more corrugated springs configured to bias the one or more magnets against a lid of the one or more inversion cups. According to aspect (10), the retainer has a plurality of rails and grooves configured to engage corresponding rails and grooves of the cutting block. According to aspect (11), the cutting block is configured to be rotatable relative to the carriage. According to aspect (12), further provided are a plurality of rods configured to indicate the orientation of the cut guide assembly. According to aspect (13), an instrument system for orthopedic procedures, a reamer, a cut guide assembly configured to be coupled to the reamer, the cut guide assembly comprising: a first arm, a clamp configured to be movable along the shaft of the reamer, the clamp being configured to be positioned within the first arm and including a leaf spring configured to flex when selectively engaged with the shaft of the reamer to fix the clamp to the shaft, a carriage configured to be movable along the arm, a cut block configured to be coupled to the carriage, a cut guide assembly comprising: an instrument system comprising: According to aspect (14), further provided are one or more magnets configured to couple the cut block to the carriage. According to aspect (15), the carriage has a plurality of rails and grooves configured to engage corresponding rails and grooves of the cut block. According to aspect (16), the cut block is configured to be rotatable relative to the carriage. According to aspect (17), further provided are one or more inversion cups configured to receive one or more magnets therein, and one or more corrugated springs configured to bias the one or more magnets against a lid of the one or more inversion cups. According to aspect (18), a method of excising the humeral head, inserting a reamer into the humerus, adjusting the proximal-distal position of the cut block assembly relative to the reamer and the humerus, clamping the cut block assembly to the reamer when a desired proximal-distal position of the cut block relative to the humerus is obtained, adjusting the anterior-posterior position of the cut block, adjusting the rotational position of the cut block, a method comprising: According to aspect (19), further comprising attaching the cut block to the cut block assembly via one or more magnets. According to aspect (20), clamping the cutting block assembly to the reamer includes engaging a leaf spring with the reamer and deflecting the leaf spring laterally with respect to the reamer.

Claims

1. An instrument assembly for orthopedic procedures, comprising: a reamer, a cut guide assembly configured to be coupled to the reamer, the cut guide assembly comprising: a clamp selectively movable along and lockable to the shaft of the reamer; a first arm protruding from the clamp; a carriage selectively movable along the longitudinal length of the first arm; a cut block coupled to the carriage via one or more magnets; the cut guide assembly comprising the above; one or more reversing cups configured to receive the one or more magnets therein; one or more wave springs configured to bias the one or more magnets against the lid of the one or more reversing cups; and comprising the above, wherein the carriage includes a second arm protruding away from the first arm and a retainer configured to receive the one or more magnets therein. An instrument assembly.

2. The clamp comprises: a leaf spring disposed inside the first arm, extending along the first arm, and configured to bend outwardly with respect to the first arm; a plunger connected to a longitudinal end of the leaf spring and configured to engage with the shaft of the reamer; a lever connected to the other longitudinal end of the leaf spring and configured to move and bend the leaf spring so that the plunger engages with and disengages from the shaft of the reamer. The instrument assembly according to claim 1.

3. The plunger is positioned within the first arm and movable with respect to the first arm, and the lever is positioned at the longitudinal end of the first arm on the side opposite to the reamer. The instrument assembly according to claim 2.

4. The carriage includes a spring finger configured to engage with the first arm. The instrument assembly according to any one of claims 1 to 3.

5. The one or more magnets include button magnets. The instrument assembly according to claim 1.

6. The retainer has a plurality of rails and grooves configured to engage with a plurality of rails and grooves of the corresponding cut block. The instrument assembly according to claim 1.

7. ​ The cutting block is configured to be rotatable with respect to the carriage, and the instrument assembly according to any one of claims 1 to 6.

8. An instrument system for orthopedic procedures, a reamer, a cutting guide assembly configured to be coupled to the reamer, the cutting guide assembly comprising: a clamp configured to be movable along the shaft of the reamer, the clamp including a first arm protruding from the clamp and a leaf spring disposed inside the first arm, extending along the first arm, and configured to bend outwardly with respect to the first arm; a carriage configured to be movable along the first arm; a cutting block configured to be coupled to the carriage; the cutting guide assembly comprising; one or more magnets configured to couple the cutting block to the carriage; one or more reversing cups configured to receive the one or more magnets therein; one or more wave springs configured to bias the one or more magnets against a lid of the one or more reversing cups; and comprising the carriage including a second arm protruding away from the first arm and a retainer configured to receive the one or more magnets therein, the instrument system.

9. The instrument system according to claim 8, wherein the carriage has a plurality of rails and grooves configured to engage corresponding rails and grooves of the cutting block.

10. The instrument system according to claim 8 or claim 9, wherein the cutting block is configured to be rotatable with respect to the carriage.

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