Retainer for elongated surgical device and method for removing the device

Abstract: A flexible surgical screw retainer (20) and method for holding a surgical screw within a sterilizable package (10) and dispensing the screw (52) in a controlled manner at a selected site. The retainer has an elongated recess (50) into which a surgical screw may be placed in order to be retained by frictional engagement with the side walls of the recess. The recess is sized to any of a variety of screw sizes. When the package is opened, the surgical screw retainer may be removed and grasped by a user and squeezed in order to disengage the screw from the recess and enable it to fall to a selected surface.

Description: BACKGROUND OF THE INVENTION FIELD OF THE INVENTION This invention relates to packages for retaining surgical devices. In particular, this invention relates to a sterilizable package for retaining a surgical screw and enabling the controlled removal of the screw in a manner which does not compromise its sterility. DESCRIPTION OF THE PRIOR ART Surgical devices which are sold sterile are produced in sealed packages which retain the device and enable the sterilization of the device held within the package. With respect to certain surgical devices which include sharp edges, the sealed package often includes additional components for holding the surgical device in such a way as to prevent the sharp edges from either puncturing the package, thereby compromising sterility, or abrading the interior of the package thereby creating particulate matter which may make the product unsuitable for use. With respect to certain surgical devices, the internal components within the package also serve to protect the product from damage during shipment. The foregoing considerations are quite apparent in the packaging of surgical screws. For example, surgical screws are often packaged individually in a flexible pouch which is sealable and permeable to the sterilizing agent such as gamma radiation or ethylene oxide. In certain circumstances, the pouch is replaced with a thermoformed plastic container or tray sealed along a peripheral flange with a removable lid, the lid being permeable to the sterilizing agent. Additional support for the screw may be provided by components placed into the package to prevent the screw from randomly moving about within the container interior. These package components are generally made of foam material which has the potential of producing particulate matter. Furthermore, these foam inserts are often merely pressed against a surface of the package and do not offer any controlled dispensing of the screw when the package is opened. Since surgical screw packages are opened at or near the surgical site in the sterile field immediately prior to use, considerable care must be taken upon opening the package. Not only is there a concern that particulate matter may contaminate the area but, because the screws are relatively small, they may become easily dropped as they are removed from the sterile package. Prior art packages retaining surgical screws do not include retainers which facilitate the controlled removal of the screw from the package. Generally, the package is opened and the screw is caused to drop on a selected surface. Even if a package may contain a retainer adapted to positively hold a surgical screw, no prior art device is known which offers the advantages of the invention or method disclosed herein. Accordingly it is an object of this invention to provide a package for retaining a surgical screw. It is also an object of this invention to provide a surgical screw package having a surgical screw retainer capable of retaining the screw even after the package is opened. It is also an object of this invention to provide a surgical screw package capable of controlling the manner in which the screw is removed from the package. It is also an object of this invention to provide a surgical screw package capable of controllably releasing the screw from the package. It is an additional object of this invention to provide a surgical screw package having a means for enabling a user to selectively place a screw on a selected surface without touching the screw. It is yet another object of this invention to provide a method for retaining or selectively dispensing a surgical screw. SUMMARY OF THE INVENTION These and other objects are accomplished by a retainer for holding an elongated surgical device as mainly claimed in claim 1. The objects are also accomplished by a method of removing an elongated surgical device from a package as mainly claimed in claim 6. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a front perspective view of a surgical screw package and retained according to the principles of this invention. Figure 2 shows a surgical screw retainer insert portion of Figure 1. Figure 3 is a top plan view of the surgical screw retainer of Figure 2. Figure 4 is a cross-section of Figure 3 taken along the line 4-4. Figure 5 is a diagrammatic representation of the method by which a surgical screw and its retainer are removed from a package. Figure 6 is a diagrammatic representation of the method by which a surgical screw is removed from the surgical screw retainer. DESCRIPTION OF THE PREFERRED EMBODIMENT As depicted in Figure 1, sterilizable surgical screw package 10 comprises a transparent, thermoformed container tray 12 having a body 14, peripheral flange 16 and removable lid 18. Container 12 and lid 18 are conventional packaging materials which will be well understood by those skilled in the art. For example, the tray may be formed of polyethyleneteraphthalate glycol (PETG) and the lid may be formed of a spun bonded polyolefin such as Tyvek® (a trademark of DuPont). Package 10 is designed to contain a loaded surgical screw retainer 20 (i.e. a retainer holding a screw, not shown, and sometimes referred to as a screw/retainer assembly). Body 14 and lid 18 are formed and sized in such a way as to retain the screw/retainer assembly firmly against movement within the package when it is sealed. As best seen in Figures 2 through 4, screw retainer 20 comprises a resilient body 22 having an axis 24 and a generally rectilinear shape with top surface 30, bottom surface 32 and a peripheral surface defined by end walls 34 and 36 and side walls 38 and 40. The corners 42, 43, 44 and 45 of body 22 may be contoured as shown to minimize material usage. An elongated recess 50 is formed in top surface 30 in order to frictionally retain a surgical screw 52 (best seen in Figures 4 and 5) as will be better understood below. Screw 52 is known as an interference screw and does not have a head. The body of the screw has a maximum diameter at some point or points along its length and it is this diameter which provides the most frictional engagement. Recess 50 comprises a bottom or floor 60, a top or open end 62 and a peripheral side wall 70 having straight sides 72 and 74 and curved end walls 76 and 78. Bottom surface 32 is provided with a pair of axially extending recesses 54 and 56 which further enhance the flexibility of retainer 20. The entire periphery of body 22 including side walls 38, 40 and end walls 34, 36 is tapered inwardly. Not only does this facilitate manufacture of the retainer but the incline of the end walls 34 and 36 also facilitates bending the side walls 72 and 74 of recess 50 to release the surgical screw as will be understood below. In the preferred embodiment body 22 is integrally formed in one piece from a cross-linked polyethylene foam which causes the exterior surface of retainer 20 to be relatively smooth. However, any other material may be used which can be formed into a flexible body having a surface resistant to abrasion in order to minimize any tendency to form particulate matter. A certain degree of resilience may also be helpful in order to facilitate the retention of the screw in recess 50. Preferably, the material would be thermoformable or compression moldable to produce the desired structure. The recess 50, when defined by the material of the preferred embodiment, enables peripheral wall 70 to conform to a large range of screw sizes. For example, in the preferred embodiment the dimensions of recess 50 are on the order of 29.9 mm (1.18 inches) x 5.5 mm (.218 inches) x 7.1 mm (.280 inches) (L x W x D) and the screws may range from 7 mm x 20 mm to 9 mm x 30 mm. In any given configuration, retainer 20 is able to hold any one of a variety of screw sizes because of the resiliency which enables recess 50 to conform to the screw and still frictionally engage it. Thus, to accommodate a family of screws having a range of sizes, the length of recess 50 should be as long as the longest screw and the width should be as small as the narrowest screw. The depth of recess 50 should be slightly more than the radius of the largest diameter screw in the family so more than half the largest screw body will be held within recess 50. The manner in which screw retainer 20 operates is best understood by reference to Figures 1, 5 and 6. Package 10 is first opened at the surgical site by peeling lid 18 back to allow the screw retainer with a screw to be removed from package 10. One example of how this may be done is shown in Figure 5. Screw retainer 20 may then be grasped by a user so that ends 34 and 36 may be squeezed together along axis 24 to release screw 52. Because of the resiliency of retainer 20 and the inclined shape of end walls 34 and 36, this squeezing motion causes the end walls of recess 50 to move away from screw 52 while the floor 60 of recess 50 remains in contact with the screw. Ultimately, the screw becomes exposed out of recess 50 sufficiently to fall from retainer 20 to a selected surface. Depending upon the size of the screw retained in recess 50, the mechanics of dispensing the screw from the recess may vary. For example, in some instances the floor 60 or side walls 72, 74 may push the screw out before the ends actually release it. The method of using the retainer 20 is best seen by reference to Figures 1, 5 and 6. The method comprises the steps of simply loading the screw into the recess to create a screw/retainer assembly 80, where the screw is retained by a friction fit. The assembly 80 is held within sterile package 10 until just before use. Package 10 is opened by peeling away lid 18, as shown in Figure I, and the assembly 80 is dropped onto a selected surface (not shown) as will be understood by reference to Figure 5. Assembly 80 is grasped as shown in Figure 6 to dispense the screw from the retainer. While the invention is disclosed with respect to surgical screws, it will be understood that it is equally useful with other elongated surgical devices. It will be understood by those skilled in the art that numerous improvements and modifications may be made to the preferred embodiment of the invention disclosed herein without departing from the scope thereof. We are aware of United States patent US 3696920 (Lahay / International Paper Company) which is directed to a device for organising objects such as surgical instruments. the device comprises a block of foam containing channels of a configuration adapted to retain the object. A bevelled slot provides communication between the surface of the block and the channel. The width of the slot narrows as it approaches the channel. An outer surface of the block is adhesively secured to a supporting surface. the object is inserted through the slot into the channel where it is retained in a locked position until needed. The object is then removed for use from the channel by expanding the slot sufficiently to permit the object to be withdrawn from the channel through the slot.

Claims: A retainer (20) for holding an elongated surgical device comprising: a flexible body (22) having a top surface (30), a bottom surface (32) and a pair of opposed end surfaces (34, 36); an elongated device-receiving recess having a predetermined width sufficient to frictionally engage said surgical device, characterized in that the recess (50) is formed in said top surface in alignment between said opposed end surfaces. A retainer according to claim 1 for holding a surgical device having an axis and a maximum predetermined diameter and wherein said elongated recess has a floor at a predetermined depth sufficient to accommodate said surgical device such that the distance between said top surface and said floor is greater than or equal to one-half said predetermined diameter. A retainer according to claim 1 wherein said elongated recess has an axis which is perpendicular to said opposed end surfaces. A retainer according to claim 1 wherein said opposed end surfaces are inclined relative to the axis of said elongated recess. A retainer according to claim 1 wherein said retainer is received within a package comprising a sterilizable housing containing said surgical device and said flexible body. A method of removing an elongated surgical device from a package (10) containing a retainer according to anyone of claims 1-5 comprising the steps of: providing a package (10) comprising a sealed housing containing an assembly of the flexible retainer (20) and the surgical device (52) frictionally retained within said flexible retainer, said flexible retainer having the pair of opposed, user-engageable end surfaces (34,36) situated substantially perpendicular to the axis of said surgical device, said housing being sealed with a removable lid (18) ; opening the package by removing said lid to provide access to said assembly; grasping said assembly by engaging said pair of opposed, user-engageable end surfaces with opposed fingers; squeezing said assembly to thereby release said surgical device. A method according to claim 6 wherein a step of placing said assembly in the housing comprises placing said recess facing away from said lid.

Inventors: PETERS ROBERT C, PETERS, ROBERT C.
Applicants: LINVATEC CORP, LINVATEC CORPORATION
Application year: 1996
Main classification: B65D77
IPC codes: B65D77, B65D81, A61B17, B65D25, B65D75, B65B5, A61B19