Patent Application
20210196479
The present disclosure relates generally to orthopaedic surgical instruments and, more particularly, to surgical instrument bolts for securing an orthopaedic surgical instrument to an orthopaedic prosthesis.
Joint arthroplasty is a well-known surgical procedure by which a diseased and/or damaged natural joint is replaced by a prosthetic joint, which may include one or more orthopaedic prosthesis. For example, in a hip arthroplasty surgical procedure, a patient's natural hip ball and socket joint is partially or totally replaced by a prosthetic hip joint. Similarly, in a knee arthroplasty surgical procedure, a patient's natural knee joint is partially or totally replaced by a prosthetic knee joint.
One type of orthopaedic prostheses that may be used to replace a patient's joint are known as cementless orthopaedic prostheses. An orthopaedic surgeon implants cementless prostheses into a patient's boney anatomy by impacting the prosthesis into a corresponding bone of the patient using an orthopaedic prosthesis inserter. For example, a cementless acetabular prosthesis typically includes an acetabular cup outer shell, which is configured to be implanted into a patient's acetabulum. To do so, the orthopaedic surgeon may utilize an orthopaedic prosthesis inserter to impact the outer shell into the patient's acetabulum until the outer shell is sufficiently seated into the patient's surrounding bony anatomy. Additionally, other types of cementless orthopaedic prostheses may be implanted into a patient's bony anatomy in a similar fashion using associated orthopaedic surgical instruments.
Typically, the orthopaedic prosthesis is secured to the orthopaedic prosthesis inserter or other orthopaedic surgical instrument prior to impaction. To do so, one or more surgical instrument bolts may be used to temporarily attach the orthopaedic prosthesis to the orthopaedic prosthesis inserter. However, depending on the amount of bolt stretch exhibited by the surgical instrument bolt(s), the bolts may become loosened during impaction due to vibration, which may require the orthopaedic surgeon to repeatedly re-tighten the bolt(s).
According to one aspect, an orthopaedic surgical instrument for inserting an orthopaedic prosthesis into a bone of a patient includes an orthopaedic prosthesis inserter having a body and a bolt passageway defined through the body and a surgical instrument bolt configured to be received in the bolt passageway of the body of the orthopaedic prosthesis inserter. The surgical instrument bolt includes a bolt head and a bolt shaft extending away from a bottom side of the bolt head. The bolt shaft includes a threaded end extending out of a distal end of the orthopaedic prosthesis inserter, a shank located between the bolt head and the threaded end, and an inner surface defining an axial passageway that extends through at least a portion of the bolt shaft.
In some embodiments, the inner surface further defines a first aperture on a top side of the bolt head opposite the bottom side and a second aperture on a bottom side of the threaded end of the bolt shaft. In such embodiments, the axial passageway extends from the first aperture to the second aperture such that the axial passageway extends completely through the surgical instrument bolt.
Alternatively, in other embodiments, the inner surface further defines an aperture on a top end of the bolt head, and the axial passageway is a blind passageway that extends from the aperture, through the bolt head, and into the shank of the bolt shaft. In such embodiments, the blind passageway may extend into the shank of the bolt shaft without extending into the threaded end of the bolt shaft.
In some embodiments, the inner surface further defines an aperture on a bottom side of the threaded end of the bolt shaft, and the axial passageway is a blind passageway that extends from the aperture into the bolt shaft. In such embodiments, the blind passageway extends from the aperture on the bottom side of the threaded end of the bolt shaft, through the threaded end, and into the shank of the bolt shaft without extending into the bolt head.
Additionally, in some embodiments, the axial passageway is embodied as an inner chamber located within the shank of the bolt shaft. In such embodiments, the inner chamber may not extend into the bolt head or into the threaded end of the bolt shaft.
According to another aspect, a securing device for use with a surgical instrument includes a surgical instrument bolt having a bolt head and a bolt shaft extending away from a bottom side of the bolt head. The bolt shaft includes a threaded end having a plurality of bolt threads defined thereon, a shank located between the bolt head and the threaded end, and an inner surface defining an axial passageway that extends through at least a portion of the bolt shaft.
In some embodiments, the inner surface further defines a first aperture on a top side of the bolt head opposite the bottom side and a second aperture on a bottom side of the threaded end of the bolt shaft. In such embodiments, the axial passageway extends from the first aperture to the second aperture such that the axial passageway extends completely through the surgical instrument bolt.
Alternatively, in other embodiments, the inner surface further defines an aperture on a top end of the bolt head, and the axial passageway is a blind passageway that extends from the aperture, through the bolt head, and into the shank of the bolt shaft. In such embodiments, the blind passageway may extend into the shank of the bolt shaft without extending into the threaded end of the bolt shaft.
In some embodiments, the inner surface further defines an aperture on a bottom side of the threaded end of the bolt shaft, and the axial passageway is a blind passageway that extends from the aperture into the bolt shaft. In such embodiments, the blind passageway extends from the aperture on the bottom side of the threaded end of the bolt shaft, through the threaded end, and into the shank of the bolt shaft without extending into the bolt head.
Additionally, in some embodiments, the axial passageway is embodied as an inner chamber located within the shank of the bolt shaft. In such embodiments, the inner chamber may not extend into the bolt head or into the threaded end of the bolt shaft.
According to yet another aspect, an orthopaedic surgical instrument for inserting an orthopaedic prosthesis into a bone of a patient includes a handle having an impaction plate and a shaft extending from the handle. The shaft includes a threaded end, a shank located between the handle and the threaded end, and an inner surface defining an axial passageway that extends through at least a portion of the shaft.
In some embodiments, the inner surface further defines an aperture on a bottom side of the threaded end and the axial passageway extends from the aperture into the shaft. In such embodiments, the axial passageway may be embodied as a blind passageway. Alternatively, in other embodiments, the axial passageway may be embodied as an inner chamber located within the shank of the shaft.
The concepts described herein are illustrated by way of example and not by way of limitation in the accompanying figures. For simplicity and clarity of illustration, elements illustrated in the figures are not necessarily drawn to scale. Where considered appropriate, reference labels have been repeated among the figures to indicate corresponding or analogous elements. The detailed description particularly refers to the accompanying figures in which:
While the concepts of the present disclosure are susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawings and will be described herein in detail. It should be understood, however, that there is no intent to limit the concepts of the present disclosure to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives consistent with the present disclosure and the appended claims.
Terms representing anatomical references, such as anterior, posterior, medial, lateral, superior, inferior, etcetera, may be used throughout the specification in reference to the orthopaedic implants or prostheses and surgical instruments described herein as well as in reference to the patient's natural anatomy. Such terms have well-understood meanings in both the study of anatomy and the field of orthopaedics. Use of such anatomical reference terms in the written description and claims is intended to be consistent with their well-understood meanings unless noted otherwise.
References in the specification to “one embodiment,” “an embodiment,” “an illustrative embodiment,” etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may or may not necessarily include that particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described. Additionally, it should be appreciated that items included in a list in the form of “at least one A, B, and C” can mean (A); (B); (C); (A and B); (A and C); (B and C); or (A, B, and C). Similarly, items listed in the form of “at least one of A, B, or C” can mean (A); (B); (C); (A and B); (A and C); (B and C); or (A, B, and C).
In the drawings, some structural or method features may be shown in specific arrangements and/or orderings. However, it should be appreciated that such specific arrangements and/or orderings may not be required. Rather, in some embodiments, such features may be arranged in a different manner and/or order than shown in the illustrative figures. Additionally, the inclusion of a structural or method feature in a particular figure is not meant to imply that such feature is required in all embodiments and, in some embodiments, may not be included or may be combined with other features.
Referring now to
As discussed in more detail below, the surgical instrument bolt 104 includes an axial passageway 224 defined therethrough to increase the amount of bolt stretch exhibited by the surgical instrument bolt 104. Due to the increased bolt stretch, the tendency, frequency, or likelihood of the surgical instrument bolt 104 loosening during impaction is reduced. That is, the increased bolt stretch allows the surgical instrument bolt 104 to absorb vibrational forces caused during impaction without causing the threads of the surgical instrument bolt 104 to loosen. It should be appreciated that the inclusion of the axial passageway 224 increases the bolt stretch of the surgical instrument bolt 104 without the need to modify the diameter, length, or thread pitch of the surgical instrument bolt 104 relative to typical surgical instrument bolts used with the orthopaedic prosthesis inserter 102 and orthopaedic prosthesis 106. As such, in the illustrative embodiment, the surgical instrument bolt 104 may be used with typical orthopaedic prosthesis inserters and orthopaedic prostheses without modification thereof. Of course, in other embodiments, the surgical instrument bolt 104 may also include a modified diameter, length, and/or thread pitch relative to typical orthopaedic surgical bolts used with the orthopaedic prosthesis inserter 102.
The orthopaedic prosthesis inserter 102 may be embodied as any type of orthopaedic prosthesis inserter in which a surgical instrument bolt is used to secure an orthopaedic prosthesis to the inserter. In the illustrative embodiment, as shown in
The body 110 of the orthopaedic prosthesis inserter 102 also includes a proximal end 116, opposite the distal end 112, which includes an inner surface 118 that defines the bolt passageway 120. The bolt passageway 120 is sized to receive the surgical instrument bolt 104. In some embodiments, the inner surface 118 may be threaded, and the surgical instrument bolt 104 may be threaded into the inner surface 118. In such embodiments, the threads of the inner surface 118 are sized such that, when threaded through the inner surface 118, a threaded end of the surgical instrument bolt 104 extends out of the bolt passageway 120 from the distal end 112 and the surgical instrument bolt 104 is free to rotate within the bolt passageway 120 while being retained therein. In other embodiments, however, the bolt passageway 120 may not be threaded.
Referring now to
The bolt shaft 202 includes a threaded end 210 and a shank 212 located between the bolt head 200 and the threaded end 210. In the illustrative embodiment of
The bolt shaft 202 also includes an inner surface 222 that defines the axial passageway 224, which extends through at least the shank 212 of the bolt shaft 202. It should be appreciated that because the axial passageway 224 extends through the shank 212 of the bolt shaft 202, the cross-sectional area of the shank 212 is reduced, which increases the bolt stretch of the surgical instrument bolt 104.
In the illustrative embodiment of
In other embodiments, the axial passageway 224 may be embodied as a blind passageway that does not extend completely through the bolt shaft 202. For example, as shown in
Alternatively, as shown in
In other embodiments, as show in
Referring now to
Although the orthopaedic prosthesis 106 is illustratively shown as an acetabular cup prosthesis, it should be appreciated that the surgical instrument bolt 104 may be used with other types of prostheses to secure those prostheses to the orthopaedic prosthesis inserter 102 or other prosthesis inserter. Additionally, the surgical instrument bolt 104 may be used with surgical tools, such as an orthopaedic broach, to secure such surgical tools to an associated orthopaedic inserter, impactor, or other surgical instrument. Furthermore, it should be appreciated that the surgical instrument bolt 104 may be used with other types of orthopaedic surgical instruments, other than the orthopaedic prosthesis inserter 102. That is, the surgical instrument bolt 104 may be useful with any orthopaedic surgical instrument to replace a typical bolt that may loosen due to vibrational forces to improve the bolt stretch typically exhibited by such bolts and thereby reduce the likelihood of loosening.
Referring now to
To reduce the likelihood of loosening of the orthopaedic prosthesis inserter 900 and the orthopaedic prosthesis during impaction, the shaft 904 of the orthopaedic prosthesis inserter 900 includes an inner surface 912 that defines an aperture 914 on an end 916 of the threaded end 908 and an axial passageway 918 that extends into the shaft 904 from the aperture 914. Similar to the surgical instrument bolt 104 described above, the axial passageway 918 extends through the shank 910 of the shaft 904. As such, the cross-sectional area of the shank 910 is reduce, which increases the bolt stretch of the threaded end 908 and reduces the likelihood that the threaded end 908 loosens during impaction.
Although the orthopaedic surgical instrument of
While certain illustrative embodiments have been described in detail in the drawings and the foregoing description, such an illustration and description is to be considered as exemplary and not restrictive in character, it being understood that only illustrative embodiments have been shown and described and that all changes and modifications that come within the spirit of the disclosure are desired to be protected.
There are a plurality of advantages of the present disclosure arising from the various features of the method, apparatus, and system described herein. It will be noted that alternative embodiments of the method, apparatus, and system of the present disclosure may not include all of the features described yet still benefit from at least some of the advantages of such features. Those of ordinary skill in the art may readily devise their own implementations of the method, apparatus, and system that incorporate one or more of the features of the present invention and fall within the spirit and scope of the present disclosure as defined by the appended claims.
