TRIAL IMPLANT

Abstract

TITLE OF INVENTION: TRIAL IMPLANT A trial implant (100) includes a liner (200) and a tray (300) operatively coupled with the liner (200) through an adjustable mechanism (130). The adjustable mechanism (130) comprises a pin (131), a bolt (133), and a second disc (135). The pin (131), the bolt (133), and the second disc (135) are configured between the liner (200) and the tray (300) to facilitate upward and downward movement to the liner (200) to attain an optimal position from multiple offset positions. Fig. 1

Specification

Description:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(Section 10 and Rule 13)

1. TITLE OF THE INVENTION:
TRIAL IMPLANT
2. APPLICANT:
Meril Corporation (I) Private Limited, an Indian company of the address Survey No. 135/139, Muktanand Marg, Bilakhia House, Pardi, Vapi, Valsad-396191 Gujarat, India.




The following specification particularly describes the invention and the manner in which it is to be performed:


FIELD OF INVENTION
[001] The present disclosure relates to a trial implant assembly. More particularly, the present disclosure relates to a trial implant for shoulder arthroplasty.
BACKGROUND OF INVENTION
[002] The glenohumeral joint is a highly mobile ball-and-socket joint that connects the upper arm bone (humerus) to the shoulder blade (scapula). It allows for an exceptional range of motion, but it is also prone to instability due to the shallow socket. Surrounding muscles, ligaments, and tendons work together to provide support and facilitate movement. There are several medical conditions that are associated with the glenohumeral joint such as acute proximal humerus fractures, post-traumatic glenohumeral osteoarthritis, chronic irreducible shoulder dislocation, etc. The patient suffering from any of the aforementioned medical condition may face several complications such as stiffness in the joint, loss of partial or full range of motion, pain during movement and so forth.
[003] For the treatment of such medical conditions, a doctor may suggest the patient to undergo reverse total shoulder arthroplasty (RTSA). In RTSA, the ball part is implanted on the scapula and the socket is implanted on the proximal humerus.
[004] The arrangement of the socket and the ball is positioned at an offset which may depend on the anatomy of the patient to obtain the maximum range of motion. Conventionally, a trial implant is used to determine the offset before final implantation. For every offset, there is a separate trial implant. The medical practitioner has to try a number of trial implants before deciding an optimal implant with an offset that offers the maximum range of motion. Thus, the conventional method of determining the offset of the ball and the socket arrangement may increase the overall time required for the surgery and may make the procedure cumbersome. Further, due to individual trials with different offset are to be tried upon, trauma caused to the patient is also significant.
[005] Hence, there is a need for a trial implant that overcomes the shortcomings, associated with the trial implants known in the art.
SUMMARY OF INVENTION
[006] Particular embodiments of the present disclosure are described herein below with reference to the accompanying drawings, however, it is to be understood that the disclosed embodiments are merely examples of the disclosure, which may be embodied in various forms. Well-known functions or constructions are not described in detail to avoid obscuring the present disclosure in unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.
[007] A trial implant including a liner and a tray operatively coupled with the liner through an adjustable mechanism. The adjustable mechanism includes a pin, a bolt, and a second disc. The pin, the bolt, and the second disc are configured between the liner and the tray to facilitate upward and downward movement to the liner to attain an optimal position from multiple offset positions.
BRIEF DESCRIPTION OF DRAWINGS
[008] The summary above, as well as the following detailed description of illustrative embodiments, is better understood when read in conjunction with the apportioned drawings. For the purpose of illustrating the present disclosure, exemplary constructions of the disclosure are shown in the drawings. However, the disclosure is not limited to specific methods and instrumentality disclosed herein. Moreover, those in the art will understand that the drawings are not to scale.
[009] Fig. 1 depicts a perspective view of a trial implant 100, in accordance with an embodiment of the present disclosure.
[0010] Fig. 2 depicts an isometric view of a liner 200 of the trial implant100, in accordance with an embodiment of the present disclosure.
[0011] Fig. 3a depicts a perspective view of a tray 300 of the trial implant100, in accordance with an embodiment of the present disclosure.
[0012] Fig. 3b depicts a front perspective view of the tray 300, in accordance with an embodiment of the present disclosure.
[0013] Fig. 3c depicts an enlarged view of the second slot 313 of the tray 300, in accordance with an embodiment of the present disclosure.
[0014] Fig. 3d depicts an exploded view of an adjustment mechanism 130 and a perspective view of the tray 300, in accordance with an embodiment of the present disclosure.
[0015] Fig. 4 depicts a perspective view of the liner 200 assembled with the adjustment mechanism 130, in accordance with an embodiment of the present disclosure.
[0016] Fig. 5a depicts a cross-sectional view of the trial implant 100 in a first offset 101, in accordance with an embodiment of the present disclosure.
[0017] Fig. 5b depicts a cross-sectional view of the trial implant 100 in a second offset 102, in accordance with an embodiment of the present disclosure.
[0018] Fig. 5c depicts a cross-sectional view of the trial implant 100 in a third offset 103, in accordance with an embodiment of the present disclosure.
DETAILED DESCRIPTION OF ACCOMPANYING DRAWINGS
[0019] Prior to describing the invention in detail, definitions of certain words or phrases used throughout this patent document will be defined: the terms "include" and "comprise", as well as derivatives thereof, mean inclusion without limitation; the term "or" is inclusive, meaning and/or; the phrases "coupled with" and "associated therewith", as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have a property of, or the like. Definitions of certain words and phrases are provided throughout this patent document, and those of ordinary skill in the art will understand that such definitions apply in many, if not most, instances to prior as well as future uses of such defined words and phrases.
[0020] Reference throughout this specification to "one embodiment," "an embodiment," or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in one embodiment," "in an embodiment," and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to" unless expressly specified otherwise. An enumerated listing of items does not imply that any or all of the items are mutually exclusive and/or mutually inclusive, unless expressly specified otherwise. The terms "a," "an," and "the" also refer to "one or more" unless expressly specified otherwise.
[0021] Although the operations of exemplary embodiments of the disclosed method may be described in a particular sequential order for convenient presentation, it should be understood that the disclosed embodiments can encompass an order of operations other than the particular sequential order disclosed. For example, operations described sequentially may in some cases be rearranged or performed concurrently. Further, descriptions and disclosures provided in association with one particular embodiment are not limited to that embodiment and may be applied to any embodiment disclosed herein. Moreover, for the sake of simplicity, the attached figures may not show the various ways in which the disclosed system, method, and apparatus can be used in combination with other systems, methods, and apparatuses.
[0022] Furthermore, the described includes, advantages, and characteristics of the embodiments may be combined in any suitable manner. One skilled in the relevant art will recognize that the embodiments may be practiced without one or more of the specific includes or advantages of a particular embodiment. In other instances, additional includes and advantages may be recognized in certain embodiments that may not be present in all embodiments. These includes and advantages of the embodiments will become more fully apparent from the following description and apportioned claims or may be learned by the practice of embodiments as set forth hereinafter.
[0023] In accordance with the present disclosure, a trial implant (hereon implant) is disclosed. The implant of the present disclosure is utilized during a reverse total shoulder arthroplasty (RTSA). The implant is used to determine an offset of the ball and socket arrangement of the prosthesis used for the replacement of the glenohumeral joint. The implant is placed on a prosthetic stem that is implanted in the proximal humerus. The face of the implant provides an articulating surface to a prosthetic ball component that is implanted on the scapula to substitute the ball and socket arrangement of the glenohumeral joint. The humeral stem and the ball component are to be placed at an offset in an axial or vertical direction to achieve an optimal range of motion. The offset may be defined as the distance between the center of rotation of the prosthetic glenoid ball engaging interface of the trial implant and the prosthetic humeral stem. The trial implant of the present disclosure is not restricted to a single offset.
[0024] The trial implant includes a liner, a tray, and an adjustment mechanism. The liner is placed on the tray. The assembly of the liner and the tray forms the implant. The trial implant can be toggled between multiple offsets using the adjustment mechanism. The trial implant has an initial height that is defined by the combination of the height of the tray and the liner. The height of the trial implant can be adjusted by increasing or decreasing the gap between the liner and the tray, to attain different offsets. The height of the trial implant can be adjusted using the adjustment mechanism that is disposed between the liner and the tray.
[0025] The trial implant can be toggled between multiple offsets which allows the medical practitioner to determine the offset using a single trial implant. The adjustment of the trial implant can be achieved easily without the involvement of various steps. The trial implant may be first assembled and then may be directly toddled using the adjustment mechanism for determining the optimal offset. The use of the trial implant of the present disclosure reduces the overall time of the surgery. The cost of the surgery may also be reduced as instead of using multiple implants for different offsets, only one trial implant with multiple offsets can be used. The surgical procedure is also simplified by the use of the present trial implant as the medical practitioner does not need to repeat the process of placing and removing multiple trial implants to determine the final offset, optimal for the patient.
[0026] Now referring to the figures, Fig. 1 depicts a trial implant 100. The trial implant 100 includes a proximal end 100a and a distal end 100b. The trial implant 100 includes a liner 200, a tray 300 and an adjustment mechanism 130 (as depicted in Fig. 4).
[0027] The liner 200 is disposed towards the proximal end 100a of the trial implant 100. The liner 200 may be made up of a biocompatible material including, but not limited to UHMWPE, HXPLE, UHMWPE+Vit E or a combination thereof. In an embodiment, the liner 200 is made of UHMWPE. The liner 200 may be fabricated using a method including, but not limited to, casting, molding, machining, and the like. In an embodiment, the liner 200 is fabricated using machining.
[0028] The liner 200 includes a face 211 at the proximal end 100a. The face 211 has a curvature profile that may correspond to the ball part implanted on the scapula. The ball part may at least partially make contact with the face 211. The face 211 is configured to provide an articulating surface to the ball part implanted on the scapula. The diameter of the face 211 may substantially correspond to the diameter of the ball part.
[0029] The tray 300 is disposed towards the distal end 100b of the trial implant 100. The tray 300 may be made up of biocompatible material including, but not limited to cocr,316L SS, Titanium, and so forth. In an embodiment, the tray 300 is made of Titanium. The tray 300 may be made using a fabrication method including, but not limited to, casting, molding, forging, machining, and the like. In an embodiment, the tray 300 is fabricated using machining. At least one surface of the tray 300 is configured to make contact with the bottom surface of the liner 200. The tray 300 may have a predefined diameter. In an embodiment, the diameter of the tray 300 corresponds to the diameter of the liner 200.
[0030] In an embodiment, the tray 300 includes a shaft 340 at the proximal end 100a the tray 300. In an embodiment, the shaft 340 is fixedly coupled to the bottom face of the tray 300. In another embodiment, the shaft 340 is integrally formed with the tray 300, thus forming a single component. The shaft 340 may be positioned at the center of the tray 300. In another embodiment, the shaft 340 is positioned at a place other than the center of the tray 300.
[0031] In an embodiment, the shaft 340 is configured to be coupled with a humeral stem implant that is implanted within the humerus. The shaft 340 may be coupled to the humeral stem implant using threads. The humeral stem implant may have a hollow cylindrical shape. The internal diameter of the humeral stem implant may correspond to the diameter of the shaft 340. The shaft 340 may be provided with external threads and the humeral stem implant may be provided with internal threads on the inner surface, that may be configured to mate with the external threads of the shaft 340. Other methods may also be utilized to couple the trial implant 100 and the stem implant including, but not limited to snap fit, friction fit, and the like.
[0032] Fig. 2 depicts the liner 200. The liner 200 includes a cap 210 and a central disc 230 (hereinafter disc). The cap 210 is provided at a proximal end 100a. In an embodiment, the cap 210 has a slanted tubular structure. That is, the width of the cap 210 reduces from one end to a diametrically opposite end. In the depicted embodiment, L1 and L2 define the width of two diametrically opposite ends, the first end 210a and the second end 210b. As shown, L2 is less than L1. This slant conforms to the underlying human anatomy where the trial implant 100 is to be secured.
[0033] The disc 230 protrudes from the face 211 of the cap 210. The disc 230 has a cylindrical shape. The diameter of the disc 230 may range between 5 mm and 70 mm. In an embodiment, the diameter of the disc 230 is 40 mm. The disc 230 has a bottom face 230a and a vertical face 230b which is configured to mate with the tray 300. The disc 230 includes a plurality of holes for example a first hole 231, a second hole 233, and a third hole 235.
[0034] The first hole 231 is provided at the bottom face 230a of the disc 230. The first hole 231 is configured to accommodate a bolt 133 of the adjustment mechanism 130 (explained later). The first hole 231 is positioned at a predefined distance from the center of the disc 230 towards the circumference. The predefined distance between the first hole 231 and the center of the disc 230 may range between 0.5mm and 40 mm. In an embodiment, the distance is 10 mm. The first hole 231 may have a predefined diameter. The diameter of the first hole 231 may range between 0.5mm and 40 mm. In an embodiment, the diameter of the first hole 231 is 5 mm.
[0035] The second hole 233 is provided at the bottom face 230a of the disc 230. The second hole 233 is configured to receive a column 110. In an embodiment, the second hole 233 is positioned diametrically opposite to the first hole 231. In an embodiment, the distance between the center of the disc 230 and the second hole 233 corresponds to the distance between the first hole 231 and the center of the disc 230. Alternately, the aforementioned distances may not correspond to each other. The second hole 233 may have a predefined diameter. The diameter of the second hole 233 may range between 0.5 mm and 40 mm.
[0036] It is to be noted that the diameter of the first hole 231 and the second hole 233 may be equal or different. In an embodiment, the diameter of the two is different as explained above.
[0037] The third hole 235 is provided in the vertical face 230b of the disc 230. The third hole 235 is configured to receive a pin 131 of the adjustment mechanism 130. The third hole 235 is positioned in close proximity to the first hole 231. The third hole 235 may have a predefined diameter. The diameter of the third hole 235 may range between 0.5 mm and 40 mm. In an embodiment, the diameter of the third hole 235 is 3 mm.
[0038] In accordance with Fig. 3a, the tray 300 is depicted in greater detail. The tray 300 includes a wall 310, a base 330, and the shaft 340.
[0039] The wall 310 defines the circumference of the tray 300. In an embodiment, the wall 310 is an individual component. Alternatively, the wall 310 and the base 330 may integrally form the tray 300. The wall 310 includes a first slot 311 and a second slot 313.
[0040] The first slot 311 is provided on the side of the wall 310. The orientation of the first slot 311 is circumferential. The first slot 311 is configured to allow a second disc 135 of the adjustment mechanism 130 to be accessible through the wall 310 for rotation. The length of the first slot 311 ranges from 0.5mm to 50 mm. In an embodiment, the length of the first slot 311 is 6 mm. The first slot 311 may have a predefined width. The width of the first slot 311 may range between 0.5 mm to 40 mm. In an embodiment, the width of the first slot 311 is 2 mm. In an embodiment, the first slot 311 has a rectangular shape with pointed corners. In an alternate embodiment, the shape is rectangular with curved corners. Alternately, the first slot 311 has a shape other than a rectangle, including but not limited to oval, square, and so forth.
[0041] The second slot 313 is provided in close proximity to the first slot 311. The orientation of the second slot 313 is vertical. The second slot 313 may be configured to at least partially receive the pin 131. Therefore, the second slot 313 allows the pin 131 to move vertically which facilitates the liner (200) to attain optimal position from multiple offset positions. The second slot 313may have a predefined length. The length of the second slot 313 may range between 0.2 mm to 20 mm. In an embodiment, the length of the second slot 313 is 5 mm. The second slot 313 may have a predefined width. The width of the second slot 313 may range between 0.5 mm to 20 mm. In an embodiment, the width of the second slot 313 is 3 mm. In an embodiment, the second slot 313 has a rounded rectangular shape. Alternately, the second slot 313 may have any other shape including, but not limited to oval, square, and so forth. A plurality of markings namely a first marking 313a, a second marking 313b, and a third marking 313c is provided along at least one side of the second slot 313 (shown in Fig. 3c).
[0042] The base 330 of the tray 300 includes a plurality of holes for example, a first orifice 331 and a second orifice 333(shown in Fig. 3b).
[0043] The first orifice 331 is provided on the base 330 of the tray 300. The first orifice 331 is configured to house the distal portion of the bolt 133 of the adjustment mechanism 130. The first orifice 331 is positioned at a predefined distance from the center of the disc 230 towards the circumference. The predefined distance between the first orifice 331 and the center of the base 330 may range between 0.5 mm and 20 mm. In an embodiment, the distance is 8 mm. The first orifice 331 may have a predefined diameter. The diameter of the first orifice 331 may range between 0.5 mm and 20 mm. In an embodiment, the diameter of the first orifice 331 is 5 mm.
[0044] The second orifice 333 is provided at the base 330 of the tray 300. The second orifice 333 is configured to receive at least a portion of the column 110. In an embodiment, the second orifice 333 is positioned diametrically opposite to the first orifice 331. In an embodiment, the distance between the center of the base 330 and the second orifice 333 corresponds to the distance between the first orifice 331 and the center of the base 330. Alternately, the aforementioned distances may not correspond to each other. The second orifice 333 may have a predefined diameter. The diameter of the second orifice 333 may range between 0.5 mm and 20 mm.
[0045] As shown in Fig. 3d, one end of the column 110 sits within the second orifice 333 of the tray 300. The other end of the column 110 sits within the second hole 233 of the disc 230 (as shown in Fig. 4) once the liner 200 and the tray 300 are assembled. The column 110 may have a predefined shape complimenting the shape of the second orifice 333 of the tray 300 and the second hole 233 of the disc 230. In an exemplary embodiment, the column 110 has a cylindrical shape. The diameter of the column 110 may range from 0.5 to 20mm. The column 110 may be removably coupled to the second orifice 333 using any known coupling method including, but not limited to snap-fit, taper-fit, friction fit, and so forth. Alternatively, at least one of the ends of the column 110 may be provided with external threads to mate with the inner threads that may be provided on the inner surface of the second orifice 333, to couple the column 110 to the second orifice 333. The column 110 facilitates a slidable coupling between the liner 200 with the tray 300. The column 110 may be configured to allow the liner 200 to slide vertically with respect to the tray 300. The column 110 may also restrict any motion of the liner 200 other than the vertically upward and downward motion of the liner 200 with respect to the tray 300.
[0046] In an embodiment, the adjustment mechanism 130 is disposed between the liner 200 and the tray 300. The tray 300 is operatively coupled with the liner 200 through the adjustment mechanism 130. The adjustment mechanism 130 is employed for switching between multiple offsets. The adjustment mechanism 130 includes the pin 131, the bolt 133, and the second disc 135 configured between the liner 200 and the tray 300 to facilitate upward and downward movement to the liner 200 to attain an optimal position from multiple offset positions. (explained below).
[0047] In an embodiment, the pin 131 has a cylindrical cross section. Alternately, the pin 131 may have a cross section of any other suitable shape. The shape of the pin 131 may correspond to the second slot 313. The pin 131 is at least one end of the pin 131 is disposed within the second slot 313
[0048] The bolt 133 is positioned between the tray 300 and the liner 200. The bolt 133 has a threaded portion 133a and a head 133b. The bolt 133 sits parallel to the second slot 313. The head 133b of the bolt 133 is disposed within the first hole 231. The diameter of the head 133b corresponds to the diameter of the first hole 231. A cavity 140 is provided on at least one side of the head 133b. The position of cavity 140 aligns with the second slot 313. The cavity 140 has a shape that corresponds to the shape of the pin 131. The cavity 140 is configured to receive at least one of the ends of the pin 131.
[0049] In an embodiment, the second disc 135 has a circular shape. The second disc 135 may have a predefined diameter. The diameter of the second disc 135 may range between 0.5 mm and 20 mm. In an embodiment, the second disc 135 has a diameter of 5 mm. The second disc 135 may have a predefined thickness. In an embodiment, the thickness of the second disc 135 ranges between 0.5 mm and 20 mm. The second disc 135 is provided with an aperture 135a, at the center.. The aperture 135a is provided with internal threads. The internal threads are configured to mate with the threaded portion 133a of the bolt 133.
[0050] As shown in Fig. 4, the head 133b of the bolt 133 is disposed within the first hole 231 of the liner 200. The second disc 135 is then coupled with the bolt 133 via threads. The at least a portion of the pin 131 is disposed within the cavity 140 of the head 133b of the bolt 133 via the third hole 235 of the liner 200 (not shown).
[0051] The tray 300 is assembled with the liner 200 to form the trial implant 100. The bottom face 230a of the disc 230 of the liner 200 makes contact with the base 330 of the tray 300. The vertical face 230b of the disc 230 makes contact with the internal surface of the wall 310. The threaded portion 133a of the bolt 133 sits in the first orifice 331 of the base 330 of the tray 300. The open end of the column 110 sits within the second orifice 333 of the base 330 of the tray 300. The other portion of the pin 131 is disposed within the second slot 313 of the tray 300.
[0052] At least a portion of the second disc 135 is disposed within the first slot 311 of the tray 300. The second disc 135 is configured to be rotated. The pin 131 restricts the rotational motion of bolt 133. Thus, when the second disc 135 is rotated, due to the restriction of rotational motion of the bolt 133 and torque built-up, the bolt 133 undergoes an upward or downward motion. The bolt 133while moving in the upward direction pushes the liner 200. Thus, a gap between the liner 200 and the tray 300 is introduced. This refers to the first instance wherein the second disc 135 is rotated. For each subsequent rotation of the second disc 135, the predefined gap increases due to the same aforesaid principle. Each predefined gap between the liner 200 and the tray 300 corresponds to an offset between the stem and the ball component. For example, in an embodiment, a gap of 5mm between the liner 200 and the tray 300 defines a second offset 102 (Fig. 5b).
[0053] Fig. 5a shows a first offset 101 of the trial implant 100. In the first offset 101, the pin 131 aligns with the third marking 313c. To adjust the trial implant 100 to the second offset 102, the second disc 135 is rotated in response to the rotation of the second disc 135, the bolt 133 undergoes an upward motion. The head 133b of the bolt 133 pushes the liner 200 in the upward direction. The second disc 135 may be rotated till the pin 131 aligns the second marking 313b thereby defining the second offset 102 of the trial implant 100 (shown in Fig. 5b). To adjust the trial implant 100 to a third offset 103 the second disc 135 may further be rotated till the pin 131 aligns with the first marking 313a (shown in Fig. 5c).
[0054] The scope of the invention is only limited by the appended patent claims. More generally, those skilled in the art will readily appreciate that all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the teachings of the present invention is/are used. , C , C , Claims:We Claim
1. A trial implant (100) comprising:
a liner (200);
a tray (300) operatively coupled with the liner (200) through an adjustable mechanism (130);
wherein the adjustable mechanism (130) comprises a pin (131), a bolt (133), and a second disc (135), wherein the pin (131), the bolt (133), and the second disc (135) are configured between the liner (200) and the tray (300) to facilitate upward and downward movement to the liner (200) to attain an optimal position from multiple offset positions.
2. The trial implant (100) as claimed in claim 1, wherein the liner (200) includes a face (211) at a proximal end (100a) of the trial implant (100), the face (211) having a curvature profile configured to articulate with a ball part implanted on the scapula.
3. The trial implant (100) as claimed in claim 1, wherein the liner (200) includes a cap (210) at a proximal end 100a and a central disc (230) at a bottom face (211) having a bottom face (230a) and a vertical face (230b) configured to mate with the tray (300).
4. The trial implant (100) as claimed in claim 3, wherein the central disc (230) includes a first hole (231) and a second hole (233) disposed of at the bottom face (230a), the first hole (231) is configured to accommodate the bolt (133) and the second hole (233) configured to receive a column (110).
5. The trial implant (100) as claimed in claim 3, wherein the central disc (230) includes a third hole (235) provided at a vertical face 230b of the central disc (230) and configured to receive the pin (131).
6. The trial implant (100) as claimed in claim 4, wherein the bolt (133) includes a threaded portion (133a) and a head (133b) having a cavity (140), wherein the head 133b is disposed within the first hole (231) of the liner (200) and the threaded portion (133a) sits in the first orifice (331) of the tray (300).
7. The trial implant (100) as claimed in claim 1, wherein the tray (300) includes a wall (310) having a first slot (311) and a second slot (313), the first slot (311) is provided on the side of the wall (310) and configured to allow the second disc (135) to be accessible through the wall (310) for rotation.
8. The trial implant (100) as claimed in claim 7, wherein the second slot (313) is provided in close proximity to the first slot (311) configured to at least partially receive the pin (131), wherein the second slot (313) allows the pin (131) to move vertically which facilitates the liner (200) to attain optimal position from multiple offset positions.
9. The trial implant (100) as claimed in claim 7, wherein the second disc (135) is disposed within the first slot (311) of the tray (300) and configured to be rotated, due to the restriction of rotational motion of the bolt (133) and torque built-up, the bolt (133) undergoes an upward or downward motion
10. The trial implant (100) as claimed in claim 1, wherein the tray (300) includes a base (330) having a first orifice (331) configured to house the distal portion of the bolt (133) and a second orifice (333) configured to receive at least a portion of the column (110).
11. The trial implant (100) as claimed in claim 1, wherein the tray (300) includes a shaft (340) provided at the proximal end (100a), configured to couple with a humeral stem implant implanted within the humerus.
12. The trial implant (100) as claimed in claim 1, wherein the trial implant (100) is made of any biocompatible material including UHMWPE, HXPLE, UHMWPE+Vit E, cocr,316L SS, Titanium, or a combination thereof.

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