CN219147640U - Knee joint stress test fixing device - Google Patents

Abstract

The utility model provides a knee joint stress test fixing device, which comprises: the device comprises a base, an abutting piece for abutting against one side of a target object and at least two limiting pieces for abutting against the other side of the target object; the abutting piece and the at least two limiting pieces are arranged on the base at intervals, the abutting piece can move along a first direction, and the first direction is arranged at an angle with the connecting line of the at least two limiting pieces; wherein at least one of the stoppers is rotatably provided with respect to the base about its own axis to be adapted to the outer contour shape of the target object. So configured, the target object (e.g., leg portion) can be reliably fixed based on the abutting pieces and the two limiting pieces distributed in the delta shape, and by moving the abutting pieces in the first direction. In the fixing process, the at least one limiting piece can be further matched with the outer contour shape of the target object through rotation, so that the fitting performance with the target object is improved, and meanwhile, the comfort is also improved.

Description

Knee joint stress test fixing device

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a knee joint stress testing and fixing device.

Background

At present, partial knee joint operation needs to know parameter information such as maximum gap between a knee joint tibia platform and internal and external femoral condyles, maximum lateral displacement of femur and tibia relative to each other, and the like before operation so as to evaluate soft tissue injury and relaxation of surrounding ligaments. Meanwhile, the parameter information has great significance for knee protection treatment operations such as meniscus repair, collateral ligament repair, anterior and posterior cruciate ligament reconstruction, unicondylar replacement, HTO osteotomy and the like. Currently, in order to obtain the parameter information in clinic, a doctor needs to measure the parameter information by combining a manual method with an imaging method, and the manual method consumes manpower, and simultaneously, a person fixed by the manual method is inevitably damaged by radioactivity during X-ray examination; and the most objective data is not necessarily obtained due to personal factors.

Disclosure of Invention

The utility model aims to provide a knee joint stress test fixing device which is used for solving the problems that in the prior art, the accuracy of measurement is low and an operator is easily damaged by radiation by combining manual auxiliary fixation with an imaging mode.

In order to solve the above technical problems, the present utility model provides a knee joint stress testing and fixing device, which includes: the device comprises a base, an abutting piece for abutting against one side of a target object and at least two limiting pieces for abutting against the other side of the target object; the abutting piece and the at least two limiting pieces are arranged on the base at intervals, the abutting piece can move along a first direction, and the first direction is arranged at an angle with the connecting line of the at least two limiting pieces; wherein at least one of the stoppers is rotatably provided with respect to the base about its own axis to be adapted to the outer contour shape of the target object.

Optionally, the number of the limiting parts is two, the abutting part and the limiting parts are distributed on the base in a delta shape, and the first direction is parallel to the base; the knee joint stress test fixing device comprises two connecting arm assemblies, the two connecting arm assemblies extend in the direction parallel to or coincident with the base respectively, and each limiting piece is arranged on the base through a corresponding connecting arm assembly.

Optionally, the connecting arm assembly includes a connecting arm and a translating member; the connecting arm extends along the direction parallel to or coincident with the base and is connected with the base, the translation part is movably arranged on the connecting arm along the extending direction of the connecting arm, and the limiting part is arranged on the translation part.

Optionally, the knee stress test fixture includes a locking assembly, the translating member configured as a first object, the connecting arm configured as a second object, the locking assembly for locking a position of the first object relative to the second object.

Optionally, the two limiting members are disposed on the corresponding connecting arm assemblies along respective axes, wherein the axes of the two limiting members are configured to:

The axis of one limiting piece is perpendicular to the base, and the axis of the other limiting piece is parallel to the base; or alternatively;

the axes of the two limiting pieces are perpendicular to the base;

wherein the limiting piece with the axis perpendicular to the base is rotatably arranged relative to the base around the axis of the limiting piece.

Optionally, the limiting piece with the axis parallel to the base is movably arranged on the corresponding connecting arm assembly along the direction perpendicular to the base.

Optionally, the knee stress test fixture includes a locking assembly, the stop being configured as a first object, the connecting arm assembly being configured as a second object, the locking assembly being configured to lock a position of the first object relative to the second object in a direction perpendicular to the base.

Optionally, the connecting arm assembly includes a translation member and a bracket extending in a direction perpendicular to the base, and the bracket is vertically fixed on the translation member; the limiting part is provided with a shaft cavity which is penetrated along the axial direction, a shaft rod is arranged in the shaft cavity in a penetrating mode, one end of the shaft rod is connected with the threaded part, the support is provided with an adjusting groove which is arranged along the direction perpendicular to the base in an extending mode, and the threaded part is movably arranged in the adjusting groove in a penetrating mode and can move up and down along the adjusting groove.

Optionally, the connection arm assembly is rotatably disposed on the base about an axis perpendicular to the base; and/or; the connecting arm assembly is movably arranged on the base along a second direction, wherein the second direction is perpendicular to the first direction, and the second direction is parallel to the base.

Optionally, the knee stress test fixture includes a locking assembly, the connecting arm assembly being configured as a first object, the base being configured as a second object, the locking assembly being configured to lock a rotation angle of the first object relative to the second object and/or a position of the first object relative to the second object along the second direction.

Optionally, the locking assembly comprises a latch locking structure or a knob locking structure;

the latch locking structure comprises a rack or a fluted disc arranged on one of the first object and the second object and a latch arranged on the other of the first object and the second object, wherein the latch is used for being clamped into a corresponding tooth slot in the rack or the fluted disc so as to lock the first object and the second object;

the knob lock structure includes a rotatable knob that is restrained from axial displacement with respect to one of the first object and the second object, and a screw provided on the other of the first object and the second object, the knob being screwed with the screw, the knob being rotated to lock the first object and the second object.

Optionally, the latch locking structure includes latch seat and elastic component, the latch seat is fixed to be set up on the first object, the one end of elastic component with the latch seat is connected, the other end of elastic component with the latch is connected, the elastic component is used for to the latch applys towards the elasticity of tooth's socket, so that the latch can block in when not receiving external force in the tooth's socket.

Optionally, the knee stress test fixture includes a force sensor for feeding back a force value of the abutment against the target object and/or a mechanical drive assembly; the mechanical driving assembly is used for driving the abutting piece to move in a mechanical transmission mode.

Optionally, the knee joint stress test fixing device includes a telescopic component, the telescopic component is telescopically arranged on the base along a direction perpendicular to the base, and the abutting piece is movably arranged on the telescopic component along the first direction and moves along a direction perpendicular to the base along with the telescopic component.

Optionally, the telescopic assembly comprises a lifting table, a rotating shaft parallel to the base, a first supporting piece and a second supporting piece, wherein the first supporting piece and the second supporting piece are rotatably and crosswise arranged around the rotating shaft; one end of the first supporting piece is movably and rotatably connected with the lifting platform along a direction parallel to the base, and the other end of the first supporting piece is rotatably connected with the base; one end of the second supporting piece is movably and rotatably connected with the base along a direction parallel to the base, and the other end of the second supporting piece is rotatably connected with the lifting platform; the abutting piece is movably arranged on the lifting platform along the first direction.

Optionally, the knee stress test fixture includes a latch assembly for locking the telescopic distance of the telescopic assembly relative to the base.

Optionally, the locking assembly comprises a rack arranged on the lifting platform, a locking handle and a locking column parallel to the rotating shaft; the rack extends along the direction parallel to the base and perpendicular to the rotating shaft, the clamping column is arranged at one end of the first supporting piece, and the clamping column is clamped into or separated from the rack under the driving of the clamping lock handle so as to lock or unlock the position of the first supporting piece relative to the lifting platform.

In summary, the knee joint stress test fixing device provided by the utility model comprises: the device comprises a base, an abutting piece for abutting against one side of a target object and at least two limiting pieces for abutting against the other side of the target object; the abutting piece and the at least two limiting pieces are arranged on the base at intervals, the abutting piece can move along a first direction, and the first direction is arranged at an angle with the connecting line of the at least two limiting pieces; wherein at least one of the stoppers is rotatably provided with respect to the base about its own axis to be adapted to the outer contour shape of the target object.

So configured, the target object (e.g., leg portion) can be reliably fixed based on the abutting pieces and the two limiting pieces distributed in the delta shape, and by moving the abutting pieces in the first direction. In the fixing process, the at least one limiting piece can be further matched with the outer contour shape of the target object through rotation, so that the fitting performance with the target object is improved, and meanwhile, the comfort is also improved. Therefore, the fixing accuracy of the target object is high, the target object is fixed through the knee joint stress test fixing device, then an X-ray image is shot, parameter information such as the maximum joint gap, the maximum varus angle, the maximum anteroposterior displacement degree and the like of the knee joint can be objectively provided, and the accurate diagnosis and treatment scheme can be formulated. And the operator does not need to be in direct contact with the target object, so that the radiation injury to the operator is reduced or avoided.

Drawings

Those of ordinary skill in the art will appreciate that the figures are provided for a better understanding of the present utility model and do not constitute any limitation on the scope of the present utility model. Wherein:

FIG. 1 is a schematic view of a knee stress test fixture according to an embodiment of the present utility model;

FIGS. 2 a-2 c are schematic illustrations of a knee stress test fixture for securing legs in different directions according to an embodiment of the present utility model;

FIGS. 3a and 3b are schematic views of a first locking assembly of an embodiment of the present utility model;

FIG. 4 is a schematic illustration of the connection of a stop member to a connecting arm assembly according to an embodiment of the present utility model;

FIGS. 5a and 5b are schematic views of a third locking assembly of an embodiment of the present utility model;

FIG. 6 is a schematic view of a lock rotor assembly according to an embodiment of the present utility model;

FIG. 7 is a schematic view of a telescoping assembly according to an embodiment of the present utility model;

FIG. 8 is a schematic diagram of a force sensor and mechanical drive assembly of an embodiment of the present utility model.

In the accompanying drawings:

1-a base; 11-a guide rail; 12-pulley track; 2-an abutting piece; 3-limiting parts; 31-a shaft lever; 32-nuts; 33-sealing the cap; 4-leg portions; a 5-link arm assembly; 50-sliding blocks; 51-a connecting arm; 52-translation member; 53-a scaffold; 531-an adjustment slot; 61-a first locking assembly; 611-rack; 612-latch; 613-tooth clamping seat; 614-elastic member; 62-a second locking assembly; 621-a lock rotor; 6211-fluted disc; 6212-an elastic member; 6213-a toothed disc drive shaft; 622-lock-shift component; 6221-rack; 6222-latch; 63-a third locking assembly; 631-a knob; 632-screw; 7-a telescoping assembly; 71-lifting table; 711-rack; 712-latch handle; 713-an elastic member; 714-pulley track; 72-rotating shaft; 73-a first support; 731-pulley; 74-a second support; 741-pulleys; 732-clamping columns; 81-force sensor; 82-a mechanical drive assembly; 821-knob; 822-a gear; 823-rack.

Detailed Description

The utility model will be described in further detail with reference to the drawings and the specific embodiments thereof in order to make the objects, advantages and features of the utility model more apparent. It should be noted that the drawings are in a very simplified form and are not drawn to scale, merely for convenience and clarity in aiding in the description of embodiments of the utility model. Furthermore, the structures shown in the drawings are often part of actual structures. In particular, the drawings are shown with different emphasis instead being placed upon illustrating the various embodiments.

As used in this disclosure, the singular forms "a," "an," and "the" include plural referents, the term "or" are generally used in the sense of comprising "and/or" and the term "several" are generally used in the sense of comprising "at least one," the term "at least two" are generally used in the sense of comprising "two or more," and the term "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance or number of features indicated. Thus, a feature defining "first," "second," "third," or the like, may explicitly or implicitly include one or at least two such features, with "one end" and "another end" and "proximal end" and "distal end" generally referring to the corresponding two portions, including not only the endpoints. Furthermore, as used in this disclosure, "mounted," "connected," and "disposed" with respect to another element should be construed broadly to mean generally only that there is a connection, coupling, mating or transmitting relationship between the two elements, and that there may be a direct connection, coupling, mating or transmitting relationship between the two elements or indirectly through intervening elements, and that no spatial relationship between the two elements is to be understood or implied, i.e., that an element may be in any orientation, such as internal, external, above, below, or to one side, of the other element unless the context clearly dictates otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, directional terms, such as above, below, upper, lower, upward, downward, left, right, etc., are used with respect to the exemplary embodiments as they are shown in the drawings, upward or upward toward the top of the corresponding drawing, downward or downward toward the bottom of the corresponding drawing.

The utility model aims to provide a knee joint stress test fixing device which is used for solving the problems that in the prior art, the accuracy of measurement is low and an operator is easily damaged by radiation by combining manual auxiliary fixation with an imaging mode.

The following description refers to the accompanying drawings.

Referring to fig. 1 to 2c, an embodiment of the present utility model provides a knee joint stress testing and fixing device, which includes: the device comprises a base 1, an abutting piece 2 for abutting against one side of a target object and at least two limiting pieces 3 for abutting against the other side of the target object; the abutting piece 2 and the at least two limiting pieces 3 are arranged on the base 1 at intervals, the abutting piece 2 is movable along a first direction, and the first direction is arranged at an angle with a connecting line of the at least two limiting pieces 3; wherein at least one of the stoppers 3 is rotatably provided about its own axis with respect to the base 1 to be adapted to the outer contour shape of the target object.

In some application scenarios, the knee joint stress test fixing device provided in this embodiment may be used to fix the leg 4 of the patient and further used to take X-ray images. The target object is now the patient's leg 4, mainly the leg 4 comprising the knee joint region. It will be understood that, in some other application scenarios, the target object may be a leg model prosthesis or other components, which may be used for the purpose of performing operation training by an operator or calibrating parameters of the knee joint stress test fixing device. An example of targeting the leg 4 will be described below.

The inventors have found that the leg portion 4 can be regarded as a joint capable of bending back and forth (i.e., bending along the sagittal plane) but incapable of bending left and right (i.e., bending along the coronal plane) in the knee joint region, and that by providing at least three fixing points on both sides of the leg portion 4 based on such anatomical features, the leg portion 4 including the knee joint can be reliably fixed as desired. Here, the two sides of the leg 4 may be the left and right sides (as shown in fig. 2 a), the front and rear sides (as shown in fig. 2 b), or the front and left and right sides of the leg 4 (as shown in fig. 2 c), and may be selected according to the actual situation.

Thereby, by the movement of the abutment 2 in the first direction, the abutment 2 and the at least two stoppers 3 can be made to reliably fix the leg 4 by abutting both sides of the leg 4. In the fixing process, the at least one limiting piece 3 can be matched with the outer contour shape of the leg 4 through rotation around the shaft, so that the fitting performance with the leg 4 is improved, and meanwhile, the comfort is also improved. Therefore, the leg 4 is fixed with high accuracy, the leg 4 is fixed by the knee joint stress test fixing device, then an X-ray image is shot, parameter information such as the maximum joint gap, the maximum varus angle, the maximum front-back displacement degree and the like of the knee joint can be objectively provided, and the accurate diagnosis and treatment scheme can be formulated. And the operator does not need to make direct contact with the patient's leg 4, reducing or avoiding radiation injury to the operator.

Optionally, in one embodiment, the number of the limiting members 3 is two, the abutting members 2 and the limiting members 3 are arranged on the base 1 in a delta shape, the first direction is parallel to the base 1, and the first direction is set as X-direction in combination with the example shown in fig. 1. The knee joint stress test fixing device comprises two connecting arm assemblies 5, the two connecting arm assemblies 5 extend in the direction parallel to or coincident with the base 1 respectively, and each limiting piece 3 is arranged on the base 1 through a corresponding connecting arm assembly 5. As shown in fig. 2a to 2c, the base 1 serves as a carrier for the entire knee stress test fixture, which may be arranged, for example, on a carrier such as a bed, preferably extending in a horizontal direction. The two connecting arm assemblies 5 then likewise extend in the horizontal direction, on the one hand serving to connect the two limiting members 3 and on the other hand the connecting arm assemblies 5 also serve to carry the legs 4. In the example shown in fig. 1 to 2c, both connecting arm assemblies 5 extend in a first direction, i.e. the direction of extension of both connecting arm assemblies 5 is parallel to the direction of movement of the abutment 2. Of course, in other embodiments, the connecting arm assembly 5 is not limited to being necessarily parallel to the direction of movement of the abutment 2, but may also be arranged at an angle to the direction of movement of the abutment 2, which is not limited to this embodiment. It should be noted that the first direction need not be parallel to the base 1, and in some embodiments, the first direction may be disposed at an angle to the base 1, and the abutting member 2 may also achieve the effect of clamping the leg 4.

Optionally, the connecting arm assembly 5 can telescope axially along itself in order to adapt the clamping leg 4. In an alternative example, the connecting arm assembly 5 includes a connecting arm 51 and a translating member 52; the connecting arm 51 extends in a direction parallel to or coincident with the base 1 and is connected with the base 1, the translation member 52 is movably disposed on the connecting arm 51 along the extending direction of the connecting arm 51, and the limiting member 3 is disposed on the translation member 52. The connecting arm 51 comprises, for example, a linear slide on which the translator 52 can slide adaptively, so as to achieve the extension and retraction of the connecting arm assembly 5 in its own axial direction. Of course, the connecting arm assembly 5 is not limited to being able to extend and retract in the axial direction, and in some embodiments the connecting arm assembly 5 may be configured to be of a fixed length and to accommodate different thickness legs 4 by increasing the travel of the abutment 2, as the utility model is not limited in this regard.

Further, referring to fig. 1 in combination with fig. 3a and 3b, the knee stress test fixture includes a locking assembly, wherein the translating member 52 is configured as a first object, the connecting arm 51 is configured as a second object, and the locking assembly is configured to lock the position of the first object (i.e., the translating member 52) relative to the second object (i.e., the connecting arm 51). For convenience of distinction and description, the locking assembly for locking the translator 52 and the connecting arm 51 will be referred to as a first locking assembly 61 hereinafter.

The first locking assembly 61 may comprise a variety of structures, and may include, for example, a latch locking structure or a knob locking structure, etc. The following description is directed to an exemplary embodiment of a first locking assembly 61 employing a latch locking arrangement. The first locking assembly 61 includes a rack 611 provided on one of the translation member 52 and the connection arm 51, and a latch 612 provided on the other of the translation member 52 and the connection arm 51, the latch 612 being for being snapped into a corresponding slot in the rack 611 to lock the translation member 52 and the connection arm 51. In the example shown in fig. 1, the rack 611 is disposed on the connecting arm 51 and has a plurality of tooth slots recessed toward the side of the connecting arm 51, the latch 612 is disposed on the translating member 52, the position of the translating member 52 corresponding to the location of the latch 612 is provided with a through hole for the latch 612 to pass through, and the latch 612 can pass through the through hole and be engaged in a certain tooth slot of the rack 611, so as to lock the axial position of the translating member 52 relative to the connecting arm 51. Preferably, as shown in fig. 3a and 3b, the first locking assembly 61 further includes a latch base 613 and an elastic member 614, the latch base 613 is fixedly disposed on the translation member 52, one end of the elastic member 614 is connected to the latch base 613, the other end of the elastic member 614 is connected to the latch 612, and the elastic member 614 is configured to apply an elastic force to the latch 612 toward the tooth slot, so that the latch 612 can be reliably clamped in the tooth slot when no external force is applied. When it is required to adjust the axial position of the translating element 52 relative to the connecting arm 51, the operator can apply an external force to the latch 612 away from the tooth slot and overcome the elastic force of the elastic element 614 to drive the latch 612 to separate from the tooth slot, and at this time, the first locking assembly 61 is in the unlocked state, and the axial position of the translating element 52 relative to the connecting arm 51 is no longer locked, so that the translating element 52 is allowed to move along the connecting arm 51. After the translation member 52 is adjusted to a proper position along the connecting arm 51, the operator only needs to release the latch 612, and the latch 612 is snapped into the tooth slot under the elastic force of the elastic member 614 to switch to the locking state, so as to lock the axial position of the translation member 52 relative to the connecting arm 51. It will be appreciated that in other embodiments, the rack 611 may be provided on the translating member 52 and the latch 612 may be provided on the connecting arm 51, as those skilled in the art will understand and configure the present utility model based on the description of the above examples, which is not limited thereto.

For convenience of description, a direction perpendicular to the first direction and parallel to the base 1 will be referred to as a second direction in conjunction with the example shown in fig. 1; and the direction perpendicular to the base 1 is referred to as a third direction; the second direction is the Y direction, and the third direction is the Z direction. Optionally, in some embodiments, the connection arm assembly 5 is rotatably disposed to the base 1 about an axis a perpendicular to the base 1. In some application scenarios, in order to adapt to legs 4 of different lengths, the connecting arm assembly 5 may be configured to be rotatable with respect to the base 1, such that by adjusting the rotation angle of the connecting arm assembly 5 about the axis a, the spacing between two limiting members 3 located on the connecting arm assembly 5 in the second direction may be adjusted, thereby adapting to legs 4 of different lengths.

Optionally, in some embodiments, the connection arm assembly 5 is movably disposed on the base 1 along a second direction. In some application scenarios, in order to adapt to legs 4 of different lengths, the connecting arm assembly 5 may also be configured to be movable relative to the base 1 along the second direction, so that the spacing between two limiting members 3 located on the connecting arm assembly 5 along the second direction may also be adjusted, thereby adapting to legs 4 of different lengths. Of course, in some embodiments, the connecting arm assembly 5 may be configured to be rotatable about the axis a and movable in the second direction at the same time, so that adjustment of the spacing of the two stoppers 3 in the second direction is more easily satisfied. Furthermore, it should be noted that the two connecting arm assemblies 5 do not have to be configured identically, i.e. it is not necessary that both connecting arm assemblies 5 are configured to be rotatable about the axis a or movable in the second direction, but that in some embodiments one of the connecting arm assemblies 5 may be fixed to the base 1 and only the other connecting arm assembly 5 may be configured to be rotatable and/or movable. The two connecting arm assemblies 5 may be movable one and rotatable one, and may be set by those skilled in the art according to actual needs, which is not limited by the present utility model.

Optionally, the rotation and/or movement of the connecting arm assembly 5 relative to the base 1 may also be locked by a locking assembly. The connecting arm assembly 5 is configured as a first object and the base 1 is configured as a second object, the locking assembly being adapted to lock the angle of rotation of the first object (i.e. the connecting arm assembly 5) relative to the second object (i.e. the base 1) and/or the position of the first object relative to the second object in the second direction. For convenience of distinction and description, the locking assembly for locking the link arm assembly 5 and the base 1 will be referred to as a second locking assembly 62 hereinafter. The second locking assembly 62 may likewise comprise a variety of structures, such as may include a latch locking structure or a knob locking structure, etc. In particular, the second locking assembly 62 may include a lock rotation member 621 and/or a lock movement member 622 to accommodate locking requirements for rotation and movement, respectively.

A second locking assembly 62 comprising both a lock rotor 621 and a lock rotor 622 is exemplarily described below in connection with fig. 1 and 6.

Alternatively, referring to fig. 1, the base 1 includes a guide rail 11 extending in the second direction, and the connection arm assembly 5 is movably disposed on the guide rail 11 through a slider 50. The lock moving member 622 includes a rack 6221 and a latch 6222, the rack 6221 is disposed on the guide rail 11 and has a plurality of tooth grooves recessed toward a side of the guide rail 11, the latch 6222 is disposed on the slider 50, the slider 50 has a through hole for the latch 6222 to pass through corresponding to the position where the latch 6222 is disposed, and the latch 6222 can pass through the through hole and be engaged in one of the tooth grooves of the rack 6221, thereby locking the position of the slider 50 along the second direction relative to the guide rail 11. Further, the connecting arm assembly 5 is connected to the slider 50, so that the locking and unlocking of the position of the connecting arm assembly 5 along the second direction by the lock member 622 can be achieved. The specific structure and principle of the lock member 622 may be referred to the first locking assembly 61 described above and will not be repeated here.

The locking member 621 includes a toothed disc 6211 and a latch (not shown), the toothed disc 6211 being fixedly disposed on the slider 50 along the axis a, and having a plurality of tooth slots recessed in the Z direction, the plurality of tooth slots being circumferentially disposed about the axis a. In a matching manner, the latches are disposed circumferentially about axis a on the link arm assembly 5 (e.g., on the link arm 51) and the latches are disposed along axis a to project toward the toothed disc 6211. The link arm assembly 5 is movable along axis a relative to the slider 50 such that as the link arm assembly 5 moves toward the slider 50, the teeth can snap into the tooth slots of the toothed disc 6211, thereby limiting circumferential rotation of the link arm assembly 5 relative to the slider 50. Conversely, when the link arm assembly 5 moves away from the slider 50, the latch is disengaged from the tooth slot of the toothed disc 6211, thereby releasing the limit on the circumferential rotation of the link arm assembly 5 relative to the slider 50.

Further, the locking member 621 includes an elastic member 6212 and a toothed disc driving shaft 6213, the toothed disc driving shaft 6213 extends along the direction of the axis a and is fixedly connected with the toothed disc 6211, the connecting arm assembly 5 has a through hole for the elastic member 6212 and the toothed disc driving shaft 6213 to pass through, one end of the elastic member 6212 is connected with the toothed disc driving shaft 6213, the other end of the elastic member 6212 is connected with the connecting arm assembly 5, and the elastic member 6212 is used for applying an elastic force towards the toothed disc 6211, so that the toothed teeth can be reliably clamped in the tooth grooves of the toothed disc 6211 when no external force is applied.

When it is required to adjust the circumferential angle of the connection arm assembly 5 relative to the base 1, the operator can apply an external force to the toothed disc driving shaft 6213 away from the latch and overcome the elastic force of the elastic member 6212 to drive the toothed disc 6211 to separate from the latch, and at this time, the locking member 621 is in an unlocked state, and no longer locks the circumferential angle of the connection arm assembly 5 relative to the base 1, so as to allow the connection arm assembly 5 to rotate around the axis a. After the connection arm assembly 5 is adjusted to a proper angle around the axis a, the operator only needs to release the fluted disc driving shaft 6213, the fluted disc 6211 is engaged with the latch under the elastic force of the elastic member 6212 to switch to the locking state, and the circumferential angle of the connection arm assembly 5 relative to the base 1 is locked. It will be appreciated that in other embodiments, the toothed disc 6211 may be provided on the connecting arm assembly 5 and the latch on the slider 50, as will be appreciated and configured by those skilled in the art based on the description of the examples set forth above, and the utility model is not limited in this regard.

Referring to fig. 2a, 2b and 4, in some embodiments, two of the limiting members 3 are disposed on the corresponding connecting arm assemblies 5 along respective axes, wherein the axes of the two limiting members 3 are configured to be perpendicular to the base 1. It should be noted that, here, the axes of the two limiting members 3 are perpendicular to the base 1, one limiting member 3 is rotatable about its axis, the other limiting member 3 is not limited, and the other limiting member 3 may be rotatable about its axis or fixedly disposed on the connecting arm assembly 5, which is not limited in this embodiment. As shown in fig. 4, in one example, the limiting member 3 has an axial cavity penetrating in an axial direction, a shaft 31 is inserted into the axial cavity, and one end of the shaft 31 is fixed to the connecting arm assembly 5, for example, fixed to the translation member 52, by a nut 32. The other end of the shaft 31 is connected with the limiting member 3 through a sealing cap 33, and the sealing cap 33 limits the axial position of the limiting member 3 along the shaft 31, but does not limit the circumferential rotation of the limiting member 3 around the shaft 31, so that the limiting member 3 is rotatably arranged on the connecting arm assembly 5. In other embodiments, the stop member 3 may be secured to the arm assembly 5 by clamping (e.g., by screwing) the cap 33 to the stop member 3.

Referring to fig. 2c, 5a and 5b, in other embodiments, two limiting members 3 are respectively disposed on the corresponding connecting arm assemblies 5 along respective axes, wherein the axis of one limiting member 3 is configured to be perpendicular to the base 1, and the axis of the other limiting member is configured to be parallel to the base 1. Wherein the limiting member 3 having an axis perpendicular to the base 1 is rotatably provided with respect to the base 1 about its own axis. The construction and arrangement of the stop 3 with its axis perpendicular to the base 1 is shown in the exemplary embodiments of fig. 2a, 2b and 4 and will not be repeated here. There is a certain gap in the Z direction between the stop 3, whose axis is parallel to the base 1, and the base 1, which can be used to accommodate a target object such as a thigh.

An example of a stop 3 with an axis parallel to the base 1 is described below with reference to fig. 5a and 5 b. Alternatively, the limiting member 3, whose axis is parallel to the base 1, may be cylindrical, for example, and has an axial cavity passing through it in the axial direction, in which the shaft 31 is inserted. The connecting arm assembly 5 comprises a bracket 53 extending in a direction perpendicular to the base 1, the bracket 53 being vertically fixed to the translating member 52, for example by means of bolts. One end of the shaft lever 31 is arranged on the bracket 53, and the other end of the shaft lever 31 is connected with the limiting piece 3 through the sealing cap 33. Alternatively, the limiting member 3 may be rotatable around the shaft 31, or may be relatively fixed to the shaft 31, which is not limited in this embodiment.

Alternatively, the limiting members 3 having axes parallel to the base 1 are movably provided on the corresponding link arm assemblies 5 in a direction perpendicular to the base. The limiting piece 3 with the axis parallel to the base 1 is movably arranged along the Z direction, namely, the clearance between the limiting piece 3 and the base 1 along the Z direction is adjustable, so that target objects such as thighs with different thicknesses can be conveniently adapted.

Further, the movement of the stopper 3, which is axially parallel to the base 1, relative to the link arm assembly 5 in a direction perpendicular to the base 1 (i.e., the third direction Z direction) can also be locked by the locking assembly. The limiter 3 is configured as a first object and the connecting arm assembly 5 is configured as a second object, and the locking assembly is configured to lock the position of the first object (i.e. the limiter 3) relative to the second object (i.e. the connecting arm assembly 5) in a direction perpendicular to the base 1. For convenience of distinction and description, the locking assembly for locking the stopper 3 and the link arm assembly 5 will be referred to as a third locking assembly 63 hereinafter. The third locking assembly 63 may likewise comprise a variety of structures, such as may include a latch locking structure or a knob locking structure, etc.

A third locking assembly 63 comprising a knob locking arrangement is exemplarily described below in connection with fig. 5a and 5 b. The knob locking structure includes a rotatable knob 631, the knob 631 being restrained from axial displacement with respect to one of the first object and the second object, and a screw 632 provided on the other of the first object and the second object, the knob 631 being screw-coupled with the screw 632, the knob 631 being rotated to lock the first object and the second object.

In the example shown in fig. 5a and 5b, the screw 632 is provided at one end of the shaft 31, the screw 632 has an external thread, the knob 631 has an internal thread adapted to the external thread of the screw 632, and the knob 631 is screwed with the screw 632, so that the knob 631 is axially moved relative to the screw 632 by rotating around the screw 632. Further, the bracket 53 has an adjusting groove 531 extending along the Z direction, the screw member 632 is movably inserted into the adjusting groove 531 and can move up and down along the adjusting groove 531, and the outer contour shape of the knob 631 is larger than the width of the adjusting groove 531, so that the knob 631 is rotated to move toward the direction of the limiting member 3, and when the knob 631 abuts against the bracket 53, the knob is limited by the bracket 53 and cannot move along the axial direction, so that the screw member 632 and the bracket 53 are locked, i.e. the limiting member 3 is locked on the bracket 53. It will be appreciated that in some embodiments, when the knob 631 locks the limiting member 3 and the bracket 53, the limiting member 3 also abuts against the bracket 53, and the circumferential rotation of the limiting member 3 is also limited. Of course, in other embodiments, the limiting member 3 may not directly abut against the support 53, but the limiting member 3 abuts against the support 53 through a radially enlarged portion of the shaft 31. Thus, when the knob 631 locks the stopper 3 and the bracket 53, the circumferential rotation of the stopper 3 itself is not restricted. One skilled in the art can choose whether the circumferential rotation of the limiting member 3 needs to be limited according to the actual requirement, which is not limited in this embodiment.

In the above examples, the structure and principle of the latch locking structure and the knob locking structure are exemplarily described, and different locked objects are exemplified as the first object and the second object, respectively. It should be understood that the first object and the second object are not limited to the examples described above, i.e. the latch locking structure is not limited to be applied in a locking assembly for locking the translator 52 and the connecting arm 51, or in a locking assembly for locking the connecting arm assembly 5 and the base 1, but the latch locking structure may also be applied in a locking assembly for locking the limiter 3 and the base 1. Likewise, the knob lock structure is not limited to the use in the lock assembly for locking the stopper 3 and the base 1, but the knob lock structure may be used in the lock assembly for locking the translation member 52 and the link arm 51, or in the lock assembly for locking the link arm assembly 5 and the base 1. The locking assembly may be selected and configured by those skilled in the art based on the actual implementation.

In order to adapt to the thickness or bending etc. of the different legs 4, optionally the distance of the abutment 2 from the base 1 in a direction perpendicular to the base 1 is configured to be adjustable. In one embodiment, the knee stress test fixture comprises a telescopic assembly 7, the telescopic assembly 7 is telescopically arranged on the base 1 along a direction perpendicular to the base 1, and the abutting piece 2 is movably arranged on the telescopic assembly 7 along the first direction and moves along a direction perpendicular to the base 1 along with the telescopic assembly 7.

Referring to fig. 7 in combination with fig. 1, in an alternative example, the telescopic assembly 7 includes a lifting table 71, a rotation shaft 72 parallel to the base 1, a first support 73, and a second support 74, and the first support 73 and the second support 74 are rotatably disposed around the rotation shaft 72 in a crossing manner; one end of the first supporting member 73 is movably and rotatably connected to the elevating table 71 in a direction parallel to the base 1, and the other end is rotatably connected to the base 1; one end of the second support 74 is movably and rotatably connected to the base 1 in a direction parallel to the base 1, and the other end is rotatably connected to the lifting table 71; the abutment 2 is movably provided on the lifting table 71 in the first direction. It will be appreciated that since one ends of the first support 73 and the second support 74 are movable relative to the base 1 and the lifting table 71, respectively, the distance between the lifting table 71 and the base 1 can be adjusted by rotating the two sets of supports about the rotation axis 72, thereby adjusting the height of the abutment 2 relative to the base 1 in the Z-direction.

In one example, the base 1 has a pulley rail 12 extending in a first direction, the elevating platform 71 has a pulley rail 714 extending in the first direction, and one end (lower left end in fig. 7) of the first support 73 has a rotatable pulley 731, and the pulley 731 slides on the pulley rail 12. Thus, one end of the first support 73 is movably and rotatably connected to the base 1. The other end of the first support 73 is hinged to the lifting table 71, i.e. has only a rotational degree of freedom with respect to the lifting table 71 and cannot move in the first direction. One end (upper left end in fig. 7) of the second support 74 has a rotatable pulley 741, and the pulley 741 slides on the pulley rail 714. Thus, one end of the second support 74 is movably and rotatably connected to the lift table 71. The other end of the second support 74 is hinged to the base 1, i.e. has only rotational freedom with respect to the base 1 and cannot move in the first direction.

It should be noted that, in the example shown in fig. 7, one ends of the first support member 73 and the second support member 74 are disposed to move along the first direction, but in other embodiments, one ends of the first support member 73 and the second support member 74 need only move along a direction parallel to the base 1, and the movement along the first direction is not limited, for example, one ends of the first support member 73 and the second support member 74 may also move along the second direction, which is not limited by the present utility model.

Preferably, the knee stress test fixture comprises a latch assembly for locking the telescopic distance of the telescopic assembly 7 relative to the base 1.

The latch assembly may include a variety of structures, and in an alternative example, the latch assembly includes a rack 711 provided to the lift table 71, a latch handle 712, and a latch post 732 parallel to the rotation shaft 72; the rack 711 extends in a direction parallel to the base 1 and perpendicular to the rotation shaft 72, the clamping post 732 is disposed at one end of the first support member 73, and the clamping post 732 is driven by the locking handle 712 to be clamped into or separated from the rack 711, so as to lock or unlock the position of the first support member 73 relative to the lifting platform 71.

Alternatively, the rack 711 extends in the first direction and has a plurality of tooth slots spaced apart in the first direction. The locking post 732 is generally omega-shaped, and the open end thereof is rotatably disposed on the first support 73 about an axis a extending in the second direction, and the locking post 732 can be selectively locked into one of the tooth grooves of the rack 711 when rotated about the axis a to a certain angle. When the engaging post 732 engages with one of the tooth grooves, the rotation angle of the two supporting members about the rotation shaft 72 is fixed, which corresponds to locking the height of the lifting table 71 in the Z direction relative to the base 1.

In an alternative example, the latch 732 can rotate around the axis a to drop (counterclockwise in fig. 7) when it is not subjected to external force, and then separate from the tooth slot of the rack 711. The locking handle 712 is arranged to lock the locking post 732 in the tooth slot of the rack 711, thereby locking the height of the lifting platform 71 relative to the base 1 in the Z-direction.

Optionally, latch handle 712 extends generally perpendicular to axis of rotation 72 and is positioned below latch post 732 in the Z-direction. One end (right end in fig. 7) of the latch handle 712 is rotatably connected to the rack 711 about an axis B extending in the second direction, such that by driving the other end (left end in fig. 7) of the latch handle 712 such that the entire latch handle 712 rotates counterclockwise about the axis B of the right end, the latch handle 712 no longer restricts the position of the latch post 732, and the latch post 732 rotates downward about the axis a under its own weight to come out of the tooth groove of the rack 711, so that the latch assembly is switched to the unlocked state, at which time the height of the elevating platform 71 relative to the base 1 is freely adjustable. After the height of the lift table 71 is adjusted to the desired proper height, the latch handle 712 can be actuated to rotate clockwise about the axis B at the right end, and the latch assembly is switched to the locked state by pushing the latch posts 732 into the corresponding slots of the racks 711, and the height of the lift table 71 is locked.

Preferably, the latch assembly further includes an elastic member 713 (e.g., a spring plate), and the elastic member 713 is used to apply an elastic force to the latch handle 712, so that the latch handle 712 maintains the abutment with the latch post 732 when not driven by an external force, and ensures that the latch post 732 is snapped into the tooth slot of the rack 711. For example, in the example shown in fig. 7, latch handle 712 is held in place adjacent to lift table 71 by resilient member 713.

It should be noted that the latch assembly is not limited to the exemplary embodiments described above, and in other embodiments, the latch assembly may also include, for example, a latch locking structure or a knob locking structure, which may be understood and configured by those skilled in the art, and the present utility model is not limited thereto.

Referring to fig. 8, optionally, the knee stress test fixture includes a force sensor 81, where the force sensor 81 is used to feedback a force value of the abutment 2 against the target object (such as the leg 4); the force sensor 81 comprises, for example, a thrust meter, which can be mounted, for example, on the lifting table 71 and is connected to the abutment 2. The force sensor 81 is able to feed back the thrust exerted by the abutment 2 towards the leg 4 for reference by the operator.

Optionally, the knee stress test fixture includes a mechanical driving assembly 82, and the mechanical driving assembly 82 is used for driving the abutting piece 2 to move by means of mechanical transmission. As shown in fig. 8, in an alternative example, the mechanical driving assembly 82 includes a knob 821, a gear 822, and a rack 823, the knob 821 is fixedly connected coaxially with the gear 822 along the second direction, the rack 823 extends along the first direction and is fixedly connected with the abutment 2, the knob 821 is rotatably disposed on the lifting table 71, and the gear 822 is meshed with the rack 823. Thus, when the knob 821 is rotated, the rack 823 can be driven to move along the first direction by the gear 822. Whereby the movement of the abutment 2 is driven by means of a mechanical transmission. The abutting piece 2 is driven to move in a mechanical transmission mode, so that stability and reliability of the knee joint stress test fixing device are improved. Of course, the mechanical driving assembly 82 is not limited to the rack and pinion transmission structure described above, and those skilled in the art can also configure the mechanical driving assembly 82 as a mechanical driving structure such as a worm gear or a wire transmission according to the prior art, which is not limited in the present utility model. Alternatively, the force sensor 81 and the mechanical driving component 82 may be disposed alternatively or together.

In summary, the knee joint stress test fixing device provided by the utility model comprises: the device comprises a base, an abutting piece for abutting against one side of a target object and at least two limiting pieces for abutting against the other side of the target object; the abutting piece and the at least two limiting pieces are arranged on the base at intervals, the abutting piece can move along a first direction, and the first direction is arranged at an angle with the connecting line of the at least two limiting pieces; wherein at least one of the stoppers is rotatably provided with respect to the base about its own axis to be adapted to the outer contour shape of the target object. So configured, the target object (e.g., leg portion) can be reliably fixed based on the abutting pieces and the two limiting pieces distributed in the delta shape, and by moving the abutting pieces in the first direction. In the fixing process, the at least one limiting piece can be further matched with the outer contour shape of the target object through rotation, so that the fitting performance with the target object is improved, and meanwhile, the comfort is also improved. Therefore, the fixing accuracy of the target object is high, the target object is fixed through the knee joint stress test fixing device, then an X-ray image is shot, parameter information such as the maximum joint gap, the maximum varus angle, the maximum anteroposterior displacement degree and the like of the knee joint can be objectively provided, and the accurate diagnosis and treatment scheme can be formulated. And the operator does not need to be in direct contact with the target object, so that the radiation injury to the operator is reduced or avoided.

It should be noted that the above embodiments may be combined with each other. The above description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.

Claims (17)

1. A knee stress test fixture, comprising: the device comprises a base, an abutting piece for abutting against one side of a target object and at least two limiting pieces for abutting against the other side of the target object; the abutting piece and the at least two limiting pieces are arranged on the base at intervals, the abutting piece can move along a first direction, and the first direction is arranged at an angle with the connecting line of the at least two limiting pieces; wherein at least one of the stoppers is rotatably provided with respect to the base about its own axis to be adapted to the outer contour shape of the target object.

2. The knee joint stress test fixture of claim 1, wherein the number of the limiting members is two, the abutting member and the limiting members are arranged on the base in a delta-shaped arrangement, and the first direction is parallel to the base; the knee joint stress test fixing device comprises two connecting arm assemblies, the two connecting arm assemblies extend in the direction parallel to or coincident with the base respectively, and each limiting piece is arranged on the base through a corresponding connecting arm assembly.

3. The knee stress test fixture of claim 2 wherein the connecting arm assembly includes a connecting arm and a translating member; the connecting arm extends along the direction parallel to or coincident with the base and is connected with the base, the translation part is movably arranged on the connecting arm along the extending direction of the connecting arm, and the limiting part is arranged on the translation part.

4. The knee stress test fixture of claim 3, including a locking assembly, the translating member being configured as a first object, the connecting arm being configured as a second object, the locking assembly for locking a position of the first object relative to the second object.

5. The knee stress test fixture of claim 2, wherein two of the stop members are each disposed on a corresponding connecting arm assembly along a respective axis, wherein the axes of the two stop members are configured to:

the axis of one limiting piece is perpendicular to the base, and the axis of the other limiting piece is parallel to the base; or alternatively;

the axes of the two limiting pieces are perpendicular to the base;

Wherein the limiting piece with the axis perpendicular to the base is rotatably arranged relative to the base around the axis of the limiting piece.

6. The knee stress test fixture of claim 5, wherein the stop member having an axis parallel to the base is movably disposed on the corresponding connecting arm assembly in a direction perpendicular to the base.

7. The knee stress test fixture of claim 6, including a locking assembly, the stop being configured as a first object, the connecting arm assembly being configured as a second object, the locking assembly being configured to lock a position of the first object relative to the second object in a direction perpendicular to the base.

8. The knee stress test fixture of claim 6, wherein the connecting arm assembly includes a translation member and a bracket extending in a direction perpendicular to the base, the bracket being vertically secured to the translation member; the limiting part is provided with a shaft cavity which is penetrated along the axial direction, a shaft rod is arranged in the shaft cavity in a penetrating mode, one end of the shaft rod is connected with the threaded part, the support is provided with an adjusting groove which is arranged along the direction perpendicular to the base in an extending mode, and the threaded part is movably arranged in the adjusting groove in a penetrating mode and can move up and down along the adjusting groove.

9. The knee stress test fixture of claim 2, wherein the connecting arm assembly is rotatably disposed to the base about an axis perpendicular to the base; and/or; the connecting arm assembly is movably arranged on the base along a second direction, wherein the second direction is perpendicular to the first direction, and the second direction is parallel to the base.

10. The knee stress test fixture of claim 9, including a locking assembly, the connecting arm assembly being configured as a first object, the base being configured as a second object, the locking assembly being configured to lock an angle of rotation of the first object relative to the second object and/or a position of the first object relative to the second object along the second direction.

11. The knee stress test fixture of any one of claims 4, 7, 10, wherein the locking assembly includes a latch locking feature or a knob locking feature;

the latch locking structure comprises a rack or a fluted disc arranged on one of the first object and the second object and a latch arranged on the other of the first object and the second object, wherein the latch is used for being clamped into a corresponding tooth slot in the rack or the fluted disc so as to lock the first object and the second object;

The knob lock structure includes a rotatable knob that is restrained from axial displacement with respect to one of the first object and the second object, and a screw provided on the other of the first object and the second object, the knob being screwed with the screw, the knob being rotated to lock the first object and the second object.

12. The knee joint stress test fixing device according to claim 11, wherein the latch locking structure comprises a latch base and an elastic member, the latch base is fixedly arranged on the first object, one end of the elastic member is connected with the latch base, the other end of the elastic member is connected with the latch, and the elastic member is used for applying elastic force to the latch towards the tooth groove so that the latch can be clamped in the tooth groove when no external force is applied.

13. The knee stress test fixture of claim 1, comprising a force sensor for feeding back a force value of the abutment against the target object and/or a mechanical drive assembly; the mechanical driving assembly is used for driving the abutting piece to move in a mechanical transmission mode.

14. The knee stress test fixture of claim 1, including a telescoping assembly telescopically disposed on the base in a direction perpendicular to the base, the abutment movably disposed on the telescoping assembly in the first direction and moving in a direction perpendicular to the base as the telescoping assembly telescopes.

15. The knee stress test fixture of claim 14, wherein the telescoping assembly includes a lift table, a rotational axis parallel to the base, a first support and a second support, the first support and the second support being rotatably disposed crosswise about the rotational axis; one end of the first supporting piece is movably and rotatably connected with the lifting platform along a direction parallel to the base, and the other end of the first supporting piece is rotatably connected with the base; one end of the second supporting piece is movably and rotatably connected with the base along a direction parallel to the base, and the other end of the second supporting piece is rotatably connected with the lifting platform; the abutting piece is movably arranged on the lifting platform along the first direction.

16. The knee stress test fixture of claim 15, including a latch assembly for locking the telescoping distance of the telescoping assembly relative to the base.

17. The knee stress test fixture of claim 16, wherein the latch assembly includes a rack disposed on the lift table, a latch handle, and a latch post parallel to the axis of rotation; the rack extends along the direction parallel to the base and perpendicular to the rotating shaft, the clamping column is arranged at one end of the first supporting piece, and the clamping column is clamped into or separated from the rack under the driving of the clamping lock handle so as to lock or unlock the position of the first supporting piece relative to the lifting platform.

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