ARTHROSCOPIC TOOL ATTACHMENT WITH OBJECT SEPARATOR

Abstract

An attachment apparatus to an arthroscopic tool, comprising at one axial distal end of the attachment, a slider end collar of tubular cross section with a hook or fastening provision at one axial distal end of said slider end collar to connect to a force applicator and, rigidly attached at the other axial distal end of the slider end collar, are at least two pairs of substantially rod-like, closely located structures termed “sliders,” wherein each pair of said sliders are tangentially situated at opposite ends of the slider end collar and extends away from the slider end collar into channels or grooves of a slider guide sleeve with tubular cross section, wherein one distal end of the slider guide sleeve is at least a pair of cutouts for a plurality of lifting tabs placed at opposite radial distal ends along the circumference of the slider guide sleeve.

Claims

1. An attachment apparatus to an arthroscopic tool, comprising: at one axial distal end of the attachment, a slider end collar of tubular cross section with a hook or fastening provision at one axial distal end of said slider end collar to connect to a force applicator and, rigidly attached at the other axial distal end of the slider end collar, are at least two pairs of substantially rod-like, closely located structures termed “sliders;” wherein each pair of said sliders are tangentially situated at opposite ends of the slider end collar and extends away from the slider end collar into channels or grooves of a slider guide sleeve with tubular cross section; wherein one distal end of the slider guide sleeve is at least a pair of cutouts for a plurality of lifting tabs placed at opposite radial distal ends along the circumference of the slider guide sleeve; wherein said sliders can be substantially linearly displaced relative to said slider guide sleeve, and at the distal end of the sliders furthest from the slide end collar are said lifting tabs; said lifting tabs attached to sliders by any one of several means comprising being rigidly fixed to the sliders or constructed to pivot relative to the edge of the sliders so that the lifting tabs can conform to the angle of engagement with the interfacing object to be displaced; said channels along the bore surface of the slider guide sleeve kinematically guide the sliders such that the lifting tabs project radially outward when deployed.

2. The attachment apparatus to an arthroscopic tool according to claim 1: wherein one end of the slider guide sleeve has a plurality of cutouts or tab openings for the sliders and lifting tabs to pass through; wherein each tab has a cupped profile whose inner surface is concave and outer surface is convex such that the outer surface of said tab is flush to the round outer surface of the slider guide sleeve when the lifting tabs are fully seated in said tab opening.

3. The attachment apparatus to an arthroscopic tool according to claim 1: wherein the channels in the slider guide sleeve may have a low friction, non-toxic coating to minimize friction and the sliders along at least the portion that can slide along the channels of the slider guide sleeve.

4. A system, comprising: an attachment that at one axial distal end of the attachment, a slider end collar of tubular cross section with a hook or fastening provision at one axial distal end of said slider end collar to connect to a force applicator and, rigidly attached at the other axial distal end of the slider end collar, are at least two pairs of substantially rod-like, closely located structures termed “sliders,” wherein each pair of said sliders are tangentially situated at opposite ends of the slider end collar and extends away from the slider end collar into channels or grooves of a slider guide sleeve with tubular cross section, wherein one distal end of the slider guide sleeve is at least a pair of cutouts for a plurality of lifting tabs placed at opposite radial distal ends along the circumference of the slider guide sleeve, wherein said sliders can be substantially linearly displaced relative to said slider guide sleeve, and at the distal end of the sliders furthest from the slide end collar are said lifting tabs, said lifting tabs attached to sliders by any one of several means comprising being rigidly fixed to the sliders or constructed to pivot relative to the edge of the sliders so that the lifting tabs can conform to the angle of engagement with the interfacing object to be displaced, said channels along the bore surface of the slider guide sleeve kinematically guide the sliders such that the lifting tabs project radially outward when deployed; said attachment is attached to an arthroscopic tool; said arthroscopic tool having a long slender hollow tube; said tool tube disposed through a puck-like tab near the opposite end of the tool tube opening where a camera or scope lens is situated; said tool tube disposed through a tool collar that is offset from the center but with a finite distance from said puck-like tab; said attachment coupled to said arthroscopic tool after sliding said tool tube through the bore of the slider end collar, in between the sliders and through the bore of the slider guide sleeve; wherein the combined axial dimension of the slider end collar, axial distance of said “force applicator” piece, axial distance between the slider end collar and slider guide sleeve, and axial dimension of the slider guide sleeve is such that the slider guide sleeve does not extend over or past the lens opening; and the axial distance between the slider end collar and slider guide sleeve is larger than the axial displacement of the slider end collar needed to fully deploy the lifting tabs; and a linear force driver.

5. The system according to claim 4: wherein said slider guide sleeve is fixed to the tool tube by one countersunk setscrew fastened through a corresponding tap placed on at least one of the two axial distal ends of the slider guide sleeve approximately 90 degrees offset from the space between one of the pairs of sliders such that when the setscrew is applying preload, the tip of each setscrew is pressing onto the tool tube to generate sufficient friction or restraining force to keep the slider guide sleeve fixed to the tool tube during operation; said linear force driver is axially constrained by use of a structural element shaped to fit around a hollow tube that defines much of the axial portion of the arthroscopic tool's structure and be axially in between a puck-like tab and tool collar that are both fixed to said tool tube but separated by a finite distance.

6. A method of deploying or retracting a plurality of lifting tabs of an attachment apparatus to an arthroscopic tool, the apparatus including at one axial distal end of the attachment, a slider end collar of tubular cross section with a hook or fastening provision at one axial distal end of said slider end collar to connect to a force applicator and, rigidly attached at the other axial distal end of the slider end collar, are at least two pairs of substantially rod-like, closely located structures termed “sliders,” wherein each pair of said sliders are tangentially situated at opposite ends of the slider end collar and extends away from the slider end collar into channels or grooves of a slider guide sleeve with tubular cross section, wherein one distal end of the slider guide sleeve is at least a pair of cutouts for a plurality of lifting tabs placed at opposite radial distal ends along the circumference of the slider guide sleeve, wherein said sliders can be substantially linearly displaced relative to said slider guide sleeve, and at the distal end of the sliders furthest from the slide end collar are said lifting tabs, whereby: the deployment or retracting of said lifting tabs is the result of a linear force provided by a linear force driver, which can be any one or more of the following mechanisms comprising a linear stepper motor, a force transducer, return spring mechanism, or a hand squeeze trigger-style ratchet and release mechanism; wherein said linear force is transferred between a force application element or “force applicator” and said slider end collar to linearly displace a train of components comprising said slider end collar, said “sliders,” and said lifting tabs attached to one of the distal ends of the sliders wherein said linear force driver is axially constrained by use of a structural element shaped to fit around a hollow tube that defines much of the axial portion of the arthroscopic tool's structure and be axially in between a puck-like tab and tool collar that are both fixed to said tool tube but separated by a finite distance.

7. The method of claim 6, further comprising: deploying said lifting tabs by squeezing a trigger of a trigger-style ratchet and release mechanism; wherein each successive squeeze and release of said trigger moves a slider track with a grooved surface topology so an internal rachet mechanism and associated gear can lock onto the slider track and enforce single direction movement of the force applicator that is integrated with said slider track and so that said train of components is displaced in a direction such that said lifting tabs lift off or moves further away from its seated position.

8. The method of claim 7, further comprising: retracting said lifting tabs by actuating a ratchet release to allow an internal rachet mechanism and gear engaging a slider track integrated with said force applicator to release its uni-directional lock, thereby allowing the force of an initially stretched or compressed return spring mechanism to displace said slider track, force applicator, and train of components in a direction that retracts the lifting tabs toward its seated position.

Description

BRIEF DESCRIPTION OF THE DRAWING FIGURES

[0006] The drawings are provided to facilitate understanding in the detailed description. It should be noted that the drawing figures may be in simplified form and might not be to precise scale. In reference to the disclosure herein, for purposes of convenience and clarity only, directional terms such as top, bottom, left, right, up, down, over, above, below, beneath, rear, front, distal, and proximal are used with respect to the accompanying drawings. Such directional terms should not be construed to limit the scope of the embodiment in any manner.

[0007] FIG. 1 is a plan view of an exemplary arthroscopic tool

[0008] FIG. 2 is the tilted view of an object separator attachment

[0009] FIG. 3 is a tilted view of the object separator attached to the arthroscopic tool

[0010] FIG. 4A shows a tilted view of the lens opening of the arthroscopic tool's hollow tube surrounded by sliders and lifting tabs of the attachment

[0011] FIG. 4B is a tilted view of the slider guide sleeve and tab opening for the sliders and lifting tabs

[0012] FIG. 4C is a wireframe view of the combined assembly shown in FIGS. 4A and 4B

[0013] FIGS. 5A and 5B show plan and tilted views of an exemplary linear force driver attached to the attachment and arthroscopic tool, respectively

[0014] FIGS. 6A and 6B show plan and tilted views of the exemplary linear force driver attached to the attachment and arthroscopic tool, respectively, with the lifting tabs deployed

[0015] FIG. 7 is a plan view of the exemplary linear force driver attached to the attachment and arthroscopic tool with the lifting tabs deployed to separate organic matter

DETAILED DESCRIPTION

[0016] FIG. 1 shows an exemplary arthroscopic tool (100) with a puck-like tab (101) and tool collar (102) that are both fixed to the hollow tool tube (103) running the substantial length of the arthroscopic tool (100). The tab (101) and tool collar (102) may be separated by a finite distance as shown. One end of the tool tube (103) has a camera or scope lens opening (104). This lens opening (104) may have an angled cut as shown. Oftentimes in surgical procedures, this lens opening (104) faces a non-transparent obstacle occluding the region of interest. If the obstacles are adjoining but can be separated to some degree, such as two bones forming a joint, then the disclosed object separator attachment apparatus, herein termed “attachment” (200), can separate the adjoining objects to enable optical access to the area of interest. The dimensions shown only reflect the exemplary arthroscopic tool (100) and not meant to limit the range of applicability as embodiments of the disclosed invention are invariant to any specific scale or proportions.

[0017] FIG. 2 shows a tilted view of an embodiment of the attachment (200). On one distal end of the attachment (200) is a slider end collar (201) with a tubular cross section. Rigidly fixed at one distal end of the slide end collar (201) and at its radial distal extent are at least two pairs of substantially rod-like structures termed “sliders” (202). The embodiment shown depicts four sliders (202), where each pair of closely located sliders (202) are tangentially situated at opposite ends of the slider end collar (201), extends away from the slider end collar (201) and into channels or grooves (not shown) of a slider guide sleeve (203). The sliders (202) move relative to the slider guide sleeve (203). At one distal end of the slider guide sleeve (203) is at least a pair of cutouts for a plurality of lifting tabs (204) placed at opposite radial distal ends along the circumference of the slider guide sleeve (203). The slider guide sleeve (203) has a tubular cross section.

[0018] FIG. 3 shows the attachment (200) coupled to the arthroscopic tool (100), which is accomplished by sliding the tool tube (103) through the bore of the slider end collar (201), in between the sliders (202), and through the bore of the slider guide sleeve (203). One geometric requirement is the combination of the axial dimension of the slider end collar (201), axial distance of an intermediate “force applicator” piece (304c from FIGS. 5A, 5B, 6A, and 6B), axial distance between the slider end collar (201) and slider guide sleeve (203), and axial dimension of the slider guide sleeve (203) is such that the slider guide sleeve (203) does not extend over or past the lens opening (104). The second geometric requirement is the axial distance between the slider end collar (201) and slider guide sleeve (203) is larger than the axial displacement of the slider end collar (201) needed to fully deploy the lifting tabs (204). While the slider end collar (201) and sliders (202) are free to translate relative to the tool tube (103) during deployment and retraction of the lifting tabs (204), the slider guide sleeve (203) remains fixed to the tool tube (103). The slider guide sleeve (203) can be fixed to the tool tube (103) by a range of embodiments. An exemplary embodiment not depicted in any of the figures is to have one countersunk setscrew fastened through a corresponding tap placed on at least one of the two axial extents of the slider guide sleeve (203), approximately 90 degrees offset from the space between one of the pairs of sliders (202). When the setscrew is applying preload, the tip of each setscrew is pressing onto the tool tube (103) to generate sufficient friction or restraining force to keep the slider guide sleeve (203) fixed to the tool tube (103) during operation. While FIG. 3 shows the slider end collar (201) engaging the tool collar (102), actually during operation, as will be shown in FIGS. 5A, 5B, 6A, 6B, and 7, said force applicator (304c) is placed between the tool collar (102) and slider end collar (201) and should be in constant contact with the slider end collar (201) when imparting a translating force to the slider end collar (201).

[0019] FIG. 4A illustrates the sliders (202) in proximity and substantially parallel to the outer surface of the tool tube (103). At the distal axial end of the sliders (202) near the lens opening (104), are lifting tabs (204), which for the embodiment shown, each tab having a cupped profile that conforms tangentially to the round outer surface of the tool tube (103) and is flush with the round outer surface of the slider guide sleeve (203) when the lifting tabs (204) are fully seated in said tab opening (205). The embodiment depicted in this disclosure has one lifting tab (204) attached to one pair of sliders (202) on each side of the tool tube (103). The lifting tabs (204) can be rigidly fixed to the sliders (202). However, other embodiments can have the lifting tabs (204) constructed to pivot relative to the edge of the sliders (202) so that the lifting tabs (204) can conform to the angle of engagement with the interfacing object to be displaced. One example would have the lifting tabs (204) be pinned to the edge of the sliders (202) where the pin runs along the edge of the sliders (202).

[0020] FIG. 4B shows a tilted view of the slider guide sleeve (203) and tab opening (205) for the sliders (202) and lifting tabs (204) to pass through. As previously mentioned, in its fully seated position, the lifting tabs (204) sit in the tab opening (205) such that the convex side of the lifting tabs (204) conform to the outer surface contour of the slider guide sleeve (203) in a same manner a puzzle piece completes a puzzle.

[0021] FIG. 4C shows a wireframe view of the combined assembly of FIGS. 4A and 4B so that the relational form between the sliders (202), slider guide sleeve (203), lifting tabs (204), and tab opening (205) in fully seated position of the lifting tabs (204) is apparent.

[0022] Embodiments of a separate device to apply translational force to the slider end collar (201) and displace the sliders (202) and the lifting tabs (204) can vary and include one or more of the following: a linear stepper motor, a force transducer, return spring mechanism, or a hand squeeze trigger-style ratchet and release mechanism embodiment shown in FIGS. 5A, 5B, 6A, 6B, and 7. FIGS. 5A and 5B show plan and tilted views of the hand squeeze trigger-style ratchet and release mechanism embodiment (300) attached to the attachment (200) and arthroscopic tool (100), respectively. A ridge (301) molded with the main chassis of the linear force driver (300) is shown to fit snugly between the tab (101) and tool collar (102). A fixed handle (302) and trigger (303) is shown to branch off the internal mechanism (not shown) of the linear force driver (300). The slider tracks (304a and 304b) and force applicator (304c) are one integrated part. One embodiment of the lower slider track (304a) has a grooved surface topology so a rachet mechanism and associated gear can lock onto the slider track and enforce single direction movement while the trigger (303) is squeezed toward the fixed handle (302) to deploy the lifting tabs (204). Each successive squeeze and release of the trigger (303) moves the force applicator (304c), slider end collar (201), and sliders (202) in one direction so that the lifting tabs (204) lift off or further away from its seated position until the lifting tabs (204) are fully deployed. When the ratchet release (305) is deflected by the user toward the lower slider track (304a), the single direction lock (not shown) is released and the lower slider track (304a) along with the train of components including the slider end collar (201), sliders (202), and lifting tabs (204) can be retracted. A restoring force achieved by a spring (not shown) can be implemented to assure the lifting tabs (204) can fully retract to its seated position when the ratchet is unlocked. This in turn would require the force applicator (304c) to “hook into” the slider end collar (201) so the force applicator (304c) can also pull the slider end collar (201) to retract the lifting tabs (204).

[0023] FIGS. 6A and 6B show plan and tilted views of the linear force driver attached to the attachment (200) and arthroscopic tool (100), respectively, with the lifting tabs (204) deployed. Compared to FIGS. 5A and 5B, one can clearly see from FIGS. 6A, 6B, and 7 the force applicator (304c) translating away from the tool collar (102) and translating the slider end collar (201) such that the sliders (202) move further into the slider guide sleeve (203). The channels (not shown) along the bore surface of the slider guide sleeve (203), kinematically guide the sliders (202) such that the lifting tabs (204) project radially outward as shown.

[0024] FIG. 7 is based on FIG. 6A with added depiction of the initially adjoining objects (401 and 402) being separated. As a non-limiting, illustrative example, the objects (401 and 402) can be a femur and tibia bone. It is readily apparent that the scope lens near the lens opening (104) now has LOS optical access past the objects (401 and 402) to the region of interest.

[0025] The preferred embodiment of materials for all components of the attachment (200) should be biocompatible. Hence, the preferred embodiment of the components (201-205) should not adversely interact with surrounding organic matter or be toxic to the patient or degrade when the inside the medical patient. The preferred properties embodiment of the slider end collar (201), slider guide sleeve (203), and lifting tabs (204) should be hard and resist deflection under normal loads yet also not be brittle. The preferred embodiment of the channels (not shown) in the slider guide sleeve (203) may have a low friction, non-toxic coating to minimize both friction and the adverse chance for the sliders (202) to bind. The sliders (202) themselves along at least the portion that can slide along the channels of the slider guide sleeve (203) may also have a low friction coating.

[0026] The sliders (202) are structurally designed to resist buckling within the distance between the slider end collar (201) and slider guide sleeve (203) while the lifting tabs (204) apply the necessary force to separate objects (401 and 402). However, the enabling embodiments of the sliders (202) are not limited to one combination of the cross-sectional design, cross-sectional area moment of inertia, and material selection. At the same time, the sliders (202) near the lifting tabs (204) need to be flexible enough to slide along the channels in the slider guide sleeve (203) that are curved so that the lifting tabs (204) deploy radially outward from the slider guide sleeve (203) to create sufficient clearance between the objects (401 and 402). Hence, the sliders (202) may be designed to have varying levels of modulus of elasticity along its entire length. Alternatively, a single material and cross-section slider dimension may be used if sufficiently rigid in buckling and sufficiently flexible in bending when lifting the end tabs (204).

[0027] Many alterations and modifications may be made by those having ordinary skill in the art without departing from the spirit and scope of the embodiment. Therefore, it must be understood that the illustrated embodiment has been set forth only for the purposes of example and that it should not be taken as limiting the embodiment.

[0028] The words used in this specification to describe the embodiment and its various embodiments are to be understood not only in the sense of their commonly defined meanings, but to include by special definition in this specification structure, material or acts beyond the scope of the commonly defined meanings.