Patent Description:
U-shaped head frames and intermediate connection devices of operation table installations currently available comprise usually locking devices, toothed link levers and rotational connectors, after assembly, the intermediate connection devices can be rotated for <NUM>°, and can realize connection between the U-shaped head frames and the operation table installations. During use, it is necessary to lock one place with a handle, connect two places with another handle and screws, that is, to fix three places, and the problem with the connection structure is that it takes a long time for connecting with the handles and the screws, manufacturing cost of elements of the locking devices and the rotational connectors is high, and it is not easy to maintain the connection structure.

Document <CIT> discloses a positioning device.

A purpose of the present invention is to provide a link-lever assembly, dual-link-lever fixing assembly and surgical head frame, to address the problem that it takes a long time to install and connect the U-shaped head frame and operational tables, manufacturing cost of the connection pieces is high and it is difficult to maintain the parts.

To address the foregoing problem, the technical solutions provided in the present invention are that:.

Further, a first annular joint is provided circumferentially around the first connection ring, the first annular joint separates the first connection ring into two ring bodies along a width direction; and a second annular joint is provided circumferentially around the second connection ring, and the second annular joint divides the second connection ring into two ring bodies along a width direction.

Further, the link-lever assembly comprises further a handle and connection screws; the connection screws pass sequentially the second pressing panel, the connection plate and the first pressing panel, and the axis of the connection screws are perpendicular to the axis of the first connection ring in a horizontal plane; one end of the handle is hingedly connected with ends of the connection screws, a cam structure is provided at an end wherein the handle is hingedly connected with the connection screws and the cam structure is abutted to the second pressing panel. Further, the link-lever assembly comprises a limiting pin, the limiting pin is inserted in the handle; the limiting pin is slidably connected with the handle and is configured to be able to be inserted into both the handle and the connection screws to prevent the handle from rotating.

The present invention provides a dual-link-level fixing assembly, comprises the forgoing link-lever assemblies, comprises further a steering column; wherein the steering column is provided in between two link-lever assemblies, and both ends of the steering column are respectively connected with the two link-lever assemblies; connection shafts are provided at both ends of the steering column, the axes of the two connection shafts are perpendicular to each other; and the two connection shafts are inserted into connection holes in the two link-lever assemblies.

Further, at least one annular groove is provided on the connection shafts, threaded holes are opened at side surfaces of the connection holes; and fixing screws are inserted into the threaded holes and inserted into the at least one annular groove. Further, the dual-link-lever fixing assembly comprises further a gear shaft; a side of the gear shaft is inserted into the first connection ring of one of the link-lever assemblies; and a surface of another side of the gear shaft is configured to be tooth-shaped and to be connected with a U-shaped head frame.

The present invention further provides a surgical head frame, comprising the foregoing dual-link-lever fixing assembly; wherein one end of the dual-link-lever fixing assembly is connected with the U-shaped head frame and another end thereof is connected with an operational table.

In view of the foregoing technical solutions, technical effects that the present invention can realize are that:.

With the dual-joint link-lever provided in the present invention, by pressing at the same time the first pressing panel and the second pressing panel to reduce the diameters of the first annular hole and the second annular hole, with only one operation the shafts in the first annular hole and the second annular hole can be locked. In conventional technologies, by one operation only structures of a shaft can be locked and to connect two shafts, two operations are required to lock the two shafts. In comparison, with the dual-joint link-lever the locking operations are simplified, in the meanwhile the number of elements is reduced, the connection structure is simplified, installation time is reduced efficiently, manufacturing cost of the connection pieces is reduced and maintainability is improved.

To explain the technical solutions in the embodiments or the prior art more clearly, hereinafter a brief introduction is given to the drawings to be used in description of the embodiments or the prior art, obviously, the drawings given show only some embodiments of the present invention, and for of ordinary skill in the art, without paying creative effort, it is possible to obtain other drawings with the provided drawings.

In the drawings: <NUM>-link-lever assembly; <NUM>-steering column; <NUM>-gear shaft; <NUM>-dual-joint link-lever; <NUM>-guiding rod; <NUM>-handle; <NUM>-connection screw; <NUM>-limiting pin; <NUM>-connection pin; <NUM>-connection handle; <NUM>-first connection ring; <NUM>-first pressing panel; <NUM>-second connection ring; <NUM>-second pressing panel; <NUM>-connection plate; <NUM>-locking hole; <NUM>-ring portion; <NUM>-rod portion; a-first annular hole; b-second annular hole; c-first locking joint; d-second locking joint; e-first annular joint; f-second annular joint; g-connection hole; h-third locking joint; k-limiting groove; and m-annular groove.

To make the purpose, technical solutions and advantages of the present invention more clear, hereinafter a clear and complete description will be given to the technical solutions in the embodiments of the present invention in conjunction with the drawing accompanying the present invention, apparently, the embodiments given here are only some of the embodiments of the present invention rather than all. Usually elements described and shown in the following embodiments and the drawings can be laid out and designed in many different configurations.

Hereafter in combination with the accompanying drawings, some embodiments of the present invention will be described in detail. When no conflict will occur, embodiments or features in the following embodiments can be combined with each other.

For U-shaped head frames and operational tables, it takes a long time to install and connect the same, manufacturing cost of connection pieces is high and it is not easy to maintain properly the U-shaped head frames and the operational tables.

An embodiment of the present invention provides a link-lever assembly <NUM>, comprises a dual-joint link-lever <NUM> and comprises further a guiding rod <NUM>. As shown in <FIG> and <FIG>, the guiding rod <NUM> comprises a ring portion <NUM> and a rod portion <NUM>;.

By analyzing the technical solution, it can be known that: for the dual-joint link-lever <NUM>, by pressing simultaneously the first pressing panel <NUM> and the second pressing panel <NUM> diameters of the first annular hole a and the second annular hole b are reduced, in this way, with only one operation, the shafts in the first annular hole a and the second annular hole b can be locked. In conventional technologies, with one operation only one shaft can be fixed, and to connect two shafts two operations are required to respectively lock the two shafts. In comparison, the dual-joint link-lever <NUM> provided in the present invention has simplified locking operations, in the meanwhile, reduced the number of elements, simplified connection structures, shortened installation time, reduce manufacturing cost of the connection pieces and improved maintainability.

Hereinafter with reference to <FIG>, a detailed description is given to structures and configurations of the dual-joint link-lever <NUM>.

In an optional technical solution, a width of the first locking joint c increases gradually along a direction away from the first connection ring <NUM>, a width of the second locking joint d increases gradually along a direction away from the second connection ring <NUM>, therefore, when the first pressing panel <NUM> and the second pressing panel <NUM> are pressed upon, diameters of the first annular hole a and the second annular hole b are reduced, locking force on the shafts in the first annular hole a and the second annular hole b are increased and the connection is more reliable.

Further, a first annular joint e is provided circumferentially around the first connection ring <NUM>, and the first annular joint e divides the first connection ring <NUM> to be two ring bodies along a width direction; a second annular joint f is provided circumferentially around the second connection ring <NUM>, the second annular joint f divides the second connection ring <NUM> to be two ring bodies along a width direction, so that inner surfaces of the first connection ring <NUM> and the second connection ring <NUM> contact fully the shafts inserted therein and friction is improved to prevent the shafts from rotation.

Further, at least one annular locating groove k is provided on the rod portion <NUM> and is configured to locate the dual-joint link-lever <NUM>.

Specifically, the guiding rod <NUM> is made from aluminum alloy to reduce weight and make it easy to claim and use it.

In the present embodiment, a width of the second locking joint d is bigger than a width of the first locking joint c, in this way, reduction of the diameter of the second annular hole b will be smaller than reduction of the diameter of the first annular hole a, bigger locking forces can be provided to the rod portion <NUM> inserted in the second connection ring <NUM> and the connection is promised to be reliable.

In an optional technical solution of the present embodiment, the link-lever assembly <NUM> comprises further a handle <NUM> and at least one connection screw <NUM>; the at least one connection screw <NUM> passes sequentially the second pressing panel <NUM>, the connection plate <NUM> and the first pressing panel <NUM>, an axial line of the at least one connection screw <NUM> is vertical to a vertical line of the first connection ring <NUM> in a horizontal plane; one end of the handle <NUM> is hinged with an end of the at least one connection screw <NUM>, a cam structure is provided at an end of the handle <NUM> hinged with the at least one connection screw <NUM>, and the cam structure is abutted against the second pressing panel <NUM> as shown in <FIG> and <FIG>.

Specifically, at least one nut is installed at an end of the at least one connection screw <NUM>, and another end of the at least one connection screw <NUM> is connected with the handle <NUM>. The second pressing panel <NUM>, the connection plate <NUM> and the first pressing panel <NUM> are located in between the at least one nut and the handle <NUM>.

When rotating the handle <NUM>, a surface of the cam structure with a smaller diameter of the handle <NUM> is abutted against the second pressing panel <NUM>, the first locking joint c and the second locking joint d are opened, in the meanwhile the third locking joint h is opened, at this time, the shafts inserted in the first connection ring <NUM>, the second connection ring <NUM> and the ring portion <NUM> can rotate for <NUM>° freely.

When rotating the handle <NUM> to abut a surface of the cam structure with a bigger diameter of the handle <NUM> against the second pressing panel <NUM>, the handle <NUM> and the at least one nut are pressed against the first pressing panel <NUM> and the second pressing panel <NUM>, so that widths of the first locking joint c and the second locking joint d are reduced, at this time, the rod portion <NUM> interpolated in the second connection ring <NUM> is pressed upon, the third locking joint h becomes smaller, and the shafts in the first connection ring <NUM>, the second connection ring <NUM> and the ring portion <NUM> are locked and fixed. In this way, by rotating once the handle <NUM> through the dual-joint link-lever <NUM> three shafts can be locked at the same time, the three shafts comprise a shaft interpolated in the first connection ring <NUM>, the rod portion <NUM> interpolated into the second connection ring <NUM> and the shaft interpolated into the ring portion <NUM>, the number of elements is reduced, complexity and operation difficulty of the connection structures is reduced and operation time is saved.

Specifically, a locking hole <NUM> is provided in the dual-joint link-lever <NUM>, as shown in <FIG>, the locking hole <NUM> passes the second pressing panel <NUM>, the connection plate <NUM> and the first pressing panel <NUM>, and the at least one <NUM> is interpolated in the locking hole <NUM>. A hexagonal hole is provided in the first locking panel, the hexagonal hole and the locking hole <NUM> are axially connected at a tail end portion of the locking hole <NUM>, the at least one nut is provided in the hexagonal hole and can be engaged with the at least one connection screw <NUM>.

To prevent the handle <NUM> to fall off from the second pressing panel <NUM> after attachment, a mattress and a mattress protector are provided on the second pressing panel <NUM>, and the mattress is interpolated in the mattress protector and is integral with the mattress protector. Both the mattress and the mattress protector are sleeved over the at least one connection screw <NUM>, the mattress is abutted against the cam structure of the handle <NUM>, and the mattress protector is abutted against the second pressing panel <NUM>. By providing the mattress and the mattress protector friction between the handle <NUM> and the second pressing panel <NUM> is increased to prevent the handle <NUM> from rotating, loosening of the first locking joint c, the second locking joint d and the third locking joint h, and rotation or loosening of the shafts in the first connection ring <NUM>, the second connection ring <NUM> and the ring portion <NUM>.

Further, the link-lever assembly <NUM> comprises further a limiting pin <NUM>, as shown in <FIG>, the limiting pin <NUM> is inserted into the handle <NUM>; the limiting pin <NUM> is slidably connected with the handle <NUM>, and configured to be able to be interpolated into both the handle <NUM> and the at least one connection screw <NUM> to prevent the handle <NUM> from rotating, loosening of the first locking joint c, the second locking joint d and the third locking joint h, and rotation and even loosening of the shafts installed in the first connection ring <NUM>, the second connection ring <NUM> and the ring portion <NUM>.

The embodiment <NUM> of the present invention provides a dual-joint link-lever fixing assembly, comprises the foregoing link-lever assemblies <NUM>, and further comprises a steering column <NUM>; as shown in <FIG>, <FIG> and <FIG>, the steering column <NUM> is located in between two link-lever assemblies <NUM>, and both ends of the steering column <NUM> are respectively connected with the two link-lever assemblies <NUM>; connection shafts <NUM> are provided in both ends of the steering column <NUM>, axial lines of the two connection shafts <NUM> are vertical to each other; and the two connection shafts <NUM> are respectively inserted into connection holes g of the two link-lever assemblies <NUM>.

Specifically, the steering column <NUM> further comprises a connection handle <NUM>, and the two connection shafts <NUM> are respectively provided at both ends of the connection handle <NUM>.

Further, the steering column <NUM> is made from aluminum alloy, to reduce weight and make it convenient to claim and operate it.

Further, at least one annular groove m is provided on the connection shafts <NUM>, and threaded holes are opened on a side surface of the connection holes g; and fixing screws are installed into the threaded holes and inserted into the at least one annular groove m to realize location and prevent release of the connection shafts <NUM> from the connection holes g.

In the present embodiment, the dual-joint link-lever assembly comprises further a gear shaft <NUM>; as shown in <FIG>, a side of the gear shaft <NUM> is inserted into the first connection ring <NUM> of one of the link-lever assemblies <NUM>; a surface of another side of the gear shaft <NUM> is configured to be tooth-shaped, and configured to be connected with the U-shaped head frame; the first connection ring <NUM> of another of the link-lever assemblies <NUM> is configured to be connected with at least one supporting beam of the operational table.

When rotating the handles <NUM> and surfaces of the cam structures of the handles <NUM> with a smaller diameter is abutted against the second pressing panels <NUM>, the first locking joints c, the second locking joints d and the third locking joints h are opened at the same time, the two link-lever assemblies <NUM> can respectively rotate against axial lines of the two connection shafts <NUM>, the dual-joint link-lever <NUM> can rotate against axial lines of the rod portions <NUM>, and the gear shaft <NUM> can pivot against axial lines of the first connection rings <NUM>, all of the foregoing three structures can rotate for <NUM>° freely, so that it is easy to adjust angles and positions of the U-shaped head frame of the gear shaft <NUM>, which makes it convenient to use.

In the present embodiment, by connecting the steering column <NUM> and the two link-lever assemblies <NUM> random adjustment and locking of the two link-lever assemblies relative to each other can be realized. During use, by rotating the handles <NUM> on the two link-lever assemblies <NUM>, fixing of all shaft-hole connections is done. For connection devices comprising the locking device, the toothed link-levers and rotational connectors, three operations of the handle are required to fix the assembly; however, with the dual-link-lever fixing assembly, by only turning the two handles <NUM>, that is, by operating the handles <NUM> for two times, fixing is done, while operation time is saved, connection reliability of the assembly is improved and complexity reduced, less elements are used, which makes it convenient to maintain and use the assembly.

The surgical head frame provided in the present embodiment comprises the foregoing dual-link-lever fixing assembly; one end of the dual-link-lever fixing assembly is connected with the U-shaped head frame and another end thereof is connected to the at least one supporting beam of the operational table through the first connection rings <NUM>.

By connecting the U-shaped head frame with the operational table via the dual-link-lever fixing assembly, quick installation and dismantling of the U-shaped head frame is realized and it is convenient to adjust the angle and position of the U-shaped head frame.

Claim 1:
A link-lever assembly, comprising a dual-joint link-lever (<NUM>) and a guiding rod (<NUM>), wherein the guiding rod (<NUM>) comprises a ring portion (<NUM>) and a rod portion (<NUM>);
the dual-joint link-lever (<NUM>) comprises a first connection ring (<NUM>), a first pressing panel (<NUM>), a second connection ring (<NUM>), a second pressing panel (<NUM>) and a connection plate (<NUM>);
the first connection ring (<NUM>) and the second connection ring (<NUM>) are provided at both ends along a longitudinal direction of the connection plate (<NUM>), and the first connection ring (<NUM>) and the second connection ring (<NUM>) are axially parallel;
the first pressing panel (<NUM>) is provided at a side of the connection plate (<NUM>) in a thickness direction and an end portion of the first pressing panel (<NUM>) is connected with the first connection ring (<NUM>), a first locking joint (c) communicating with a first annular hole (a) of the first connection ring (<NUM>) is formed in between the first pressing panel (<NUM>) and the connection plate (<NUM>); the second pressing panel (<NUM>) is provided at another side of the connection plate (<NUM>) in the thickness direction, and an end portion of the second pressing panel (<NUM>) away from the first pressing panel (<NUM>) is connected with the second connection ring (<NUM>), and a second locking joint (d) communicating with a second annular hole (b) of the second connection ring (<NUM>) is provided in between the second pressing panel (<NUM>) and the connection plate (<NUM>);
the first pressing panel (<NUM>) and the second pressing panel (<NUM>) are configured to reduce the diameters of the first annular hole (a) and the second annular hole (b) by pressing forces acting in opposite directions;
at least one connection hole (g) is provided on the ring portion (<NUM>), a third locking joint (h) extending along an axial direction of the rod portion (<NUM>) is provided on the rod portion (<NUM>), and the third locking joint (h) is communicated with the at least one connection hole (g); the rod portion (<NUM>) is inserted into the second connection ring (<NUM>); the rod portion (<NUM>) is configured to reduce the size of the third locking joint (h) when being pressed and thereby reduces the diameter of the at least one connection hole (g) of the ring portion (<NUM>).