Patent Description:
In an orthopedic ultrasound operation, a surgeon uses an ultrasonic osteotome to perform cutting, grinding or shaping on bones or other biological tissue and bionic tissues thereof (such as cartilages and bone cement).

In the existing ultrasonic osteotome, a tip portion, i.e., a bit tip, only has a single cutting width, such that when the surgeon needs to perform accurate large-width cutting, it can only be done by means of multiple reciprocating cutting or by replacing ultrasonic scalpel bits of different widths. It is difficult for the surgeon to accurately achieve the width of an incision due to reciprocating cutting, and the replacement of the ultrasonic scalpel bits with different widths takes a relatively long time, thus affecting the continuity of surgical operation by the surgeon and extending the time of operation to a certain extent.

<CIT> describes an ultrasonic orthopedic surgical instrument for cutting or shaving hard tissues, comprising an ultrasonic transducer unit having an ultrasonic transducer for producing ultrasonic vibration; a transmission member which connects the ultrasonic transducer in the proximal end side, and transmits the ultrasonic vibration produced by the ultrasonic transducer from the proximal end side to the distal end side; a sheath in which the transmission member is inserted, and has an open part on the side of the distal end side; and a treatment portion which is provided at the distal end of the transmission member, and exposed to the open part for carrying out a surgical treatment on an object part by the ultrasonic vibration transmitted from the transmission member.

<CIT> describes a surgical ultrasonic horn used in a surgical operation, comprising s horn body and end plate portion. The end portion is provided at opposite edges thereof with a first and a second cutting portions which are different from each other.

<CIT> describes an ultrasonic surgical instrument including an ultrasonically actuated blade or end effector having a treatment portion. The treatment portion comprises a first cutting edge configured to incise tissue and further a second cutting edge which can also be configured to incise tissue.

<CIT> describes an osteotome for cutting bone, comprising a blade. The blade comprises an elongate substantially planar member having two substantially oppositely-facing lateral cutting edges. Each of the lateral cutting edges and the tip are provided a plurality of teeth.

<CIT> describes a series of tips for use with an ultrasonic or piezoelectric dental surgical device dental used in osteotomy, ostectomy and osteoplasty procedures or any procedure requiring removal or shaping of bone or other hard tissue. The tips are shaped so that they are comfortable for the surgeon to use in a proper position, so that when a handpiece to which the tips are releasably attached in held in the conventional manner, the geometry of the osteotomy will be precise and desirable.

<CIT> describes a series of tips for use with an ultrasonic or piezoelectric dental surgical device dental used in osteotomy, ostectomy and osteoplasty procedures or any procedure requiring removal or shaping of bone or other hard tissues. Fissures may be provided in a cutting end of the tip to facilitate osteotomy. The tips are shaped so that they are comfortable for the surgeon to use in a proper position, so that when a handpiece to which the tips are releasably attached is held in the conventional manner, the geometry of the osteotomy will be precise and desirable. When energized, the tips readily cut through bone or facilitate shaping of skeletal structures at the surgical site. Methods for use of the tips and systems in which the tips provided the cutting function are also described.

<CIT> describes an ultrasonic surgical blade including a top surface, a bottom surface and a cutting-edge. The cutting-edge is defined by a cutting-surface intermediate the top surface and the bottom surface, and the top surface has a width greater than the width of the bottom surface. Alternately, a second cutting-edge may be defined by a second cutting surface intermediate the top and bottom surfaces. Depending on the angle between the intermediate cutting-surface and the top surface, the cutting-edge may be sharp or blunt.

<CIT> describes an ultrasonic surgical blade which includes a body having an external surface, at least one cutting edge, and a distal end. The cutting edge can be defined by first and second surfaces which define an angle therebetween. At least a portion of the cutting edge may comprise a sharp point.

<CIT> describes an ultrasonic osteotome which comprises a shaft having a distal end portion with a lateral outer surface and further comprises a cutting blade connected to the distal end portion of the shaft at least in part at the lateral outer surface. The lateral outer surface extends so far on opposite sides of the blade as to block or stop penetration of the shaft into an incision formed in bone tissue by the blade. The blade can include a cutting notch or have a variable cutting depth depending on the angle of the distal end of the instrument to the surface of a target tissue mass.

<CIT> describes an ultrasonic horn for use with an ultrasonic surgical handpiece including a resonator comprises a linear cutting blade at the distal end of a horn body. The linear cutting blade includes adjacent side-by-side rows of teeth each of which includes a land through which ultrasonic energy is propagated outwardly from the distal end.

According to the present disclosure, an ultrasonic osteotome bit is designed, which solves the problem in the prior art of unsatisfactory effects in use due to the tip portion, i.e., the bit tip, of the ultrasonic osteotome only having a single cutting width.

The objective of the present invention is achieved by the subject matter according to the independent claim.

In order to solve the above technical problem, the present disclosure provides an ultrasonic osteotome bit, comprising a bit bar, a bit body and a bit tip. One end of the bit bar is connected to the bit tip, and the other end of the bit bar is connected to the bit body. The bit tip is of a cylindrical or substantially cylindrical structure with a cross section of a polygonal structure, and the bit tip has at least two cutting faces with different cutting widths.

In the ultrasonic osteotome bit of the present disclosure, preferably, the polygonal structure is of a centrosymmetric structure, with all internal angles formed by adjacent sides of the polygonal structure being an obtuse angle.

In the ultrasonic osteotome bit of the present disclosure, preferably, the shortest distance among the distances between respective opposite sides of the polygonal structure is not equal to the longest distance among the distances between respective opposite sides of the polygonal structure, and the two opposite sides having the shortest distance are perpendicular to the two opposite sides having the longest distance, so that the bit tip has at least two accurate and easy-to-operate cutting widths.

In the ultrasonic osteotome bit of the present disclosure, preferably, the bit is provided with a liquid flow hole.

In the ultrasonic osteotome bit of the present disclosure, preferably, the liquid flow hole comprises a longitudinal central hole of the bit body and a drainage hole penetrating the tail end of the longitudinal central hole of the bit body, and the tail end of the longitudinal central hole of the bit body is located at a connecting end, connected to the bit bar, of the bit body.

In the ultrasonic osteotome bit of the present disclosure, preferably, the drainage hole vertically penetrates a tail end of the longitudinal central hole of the bit body.

In the ultrasonic osteotome bit of the present disclosure, preferably, the liquid flow hole comprises a longitudinal central through hole that penetrates the bit body and the bit bar and extends to the bit tip.

In the ultrasonic osteotome bit of the present disclosure, preferably, the bit tip is provided with a knurled structure that extends from a foremost end face of the bit tip towards the bit bar to form a file-type bit.

In the ultrasonic osteotome bit of the present disclosure, preferably, in the bit tip, the length of the knurled structure, on the cutting face with the minimum cutting width, extending towards the bit bar is greater than the length of the knurled structure, on the cutting face with the maximum cutting width, extending towards the bit bar.

In the ultrasonic osteotome bit of the present disclosure, preferably, the foremost end face of the bit tip is of a convex structure or a concave structure.

In the ultrasonic osteotome bit of the present disclosure, preferably, the bit bar is in transitional connection with the bit body through a bevel, the bit bar is in smooth transition with the bit tip, and the tail end of the bit body is provided with a threaded structure to connect with an ultrasonic device.

The ultrasonic osteotome bit has the beneficial effects as follows.

<NUM> - bit body; <NUM> - connecting thread; <NUM> - bit bar; <NUM> - bit tip; <NUM> - foremost end face; <NUM> - liquid flow hole; <NUM> - drainage hole.

The technical solution of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings, and obviously, the described embodiments are part of, not all of, the embodiments of the present disclosure.

In the description of the present disclosure, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical" "horizontal", "inner", "outer", etc. are based on the orientation or positional relationship shown in the accompanying drawings and are intended to facilitate the description of the present disclosure and simplify the description only, rather than indicating or implying that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and will not to be interpreted as limiting the present disclosure. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

In the description of the present disclosure, it should be noted that the terms "mounting", "connecting" and "connection" should be understood in a broad sense, and unless otherwise explicitly specified or defined, for example, it may be a fixed connection, a detachable connection or an integrated connection; may be a mechanical connection or an electrical connection; and may be a direct connection or an indirect connection through an intermediate medium, or may be a communication between the interior of two elements. For those of ordinary skill in the art, the specific meanings of the terms mentioned above in the present disclosure should be construed according to specific circumstances.

The present disclosure will be further described in detail below by specific examples and with reference to the accompanying drawings. <FIG> show an ultrasonic osteotome bit according to a first example of the present disclosure. <FIG> is a first operating state view of an ultrasonic osteotome bit according to this example, and <FIG> is a second operating state view of the ultrasonic osteotome bit according to this example. As shown in <FIG>, the ultrasonic osteotome bit according to the first example of the present disclosure comprises a bit body <NUM>, a bit bar <NUM> and a bit tip <NUM>, with one end of the bit bar <NUM> being connected to the bit tip <NUM>, and the other end of the bit bar <NUM> being connected to the bit body <NUM>. The bit tip <NUM> is of a cylindrical or substantially cylindrical structure with the cross section of a polygonal structure, and the bit tip <NUM> has at least two cutting faces with different cutting widths to be in contact with a biological tissue, such as a bone. During operation, the cutting faces of the bit tip <NUM> may be selected by rotating the operating angle of the bit, thereby obtaining at least two different cutting widths. In this example, a cylindrical face, or a lateral face of a substantially cylindrical structure, of the bit tip <NUM> constitutes at least two cutting faces with different cutting widths.

<FIG> is a cross-sectional view of the bit tip of the ultrasonic osteotome bit according to this example. As shown in <FIG>, the bit tip <NUM> has the cross section of a polygonal structure. Preferably, the polygonal structure is a centrosymmetric structure, with all internal angles formed by adjacent sides of the polygonal structure being an obtuse angle. In this example, the polygonal structure is of a convex octagonal structure. When the diameter of the bit is increased, more than two cutting widths can be achieved by increasing the number of cross-sectional sides.

As shown in <FIG>, the shortest distance among the distances between respective opposite sides of the polygonal structure is not equal to the longest distance among the distances between respective opposite sides of the polygonal structure, and the two opposite sides having the shortest distance are perpendicular to the two opposite sides having the longest distance, so that the bit tip has at least two cutting widths, so that the bit can have at least two accurate cutting widths when axially rotating for cutting, and the two accurate cutting widths are easy to choose so as to facilitate operation.

<FIG> show two typical operating states of the ultrasonic osteotome bit according to the first example of the present disclosure. The ultrasonic osteotome bit in <FIG> is rotated by <NUM> degrees, relative to the ultrasonic osteotome bit in <FIG>, along the axis of the bit to perform cutting. <FIG> is a cross-sectional view of the bit tip <NUM> perpendicular to the axis. When the ultrasonic osteotome bit is in the operating state shown in <FIG>, its effective cutting width is represented by a in <FIG>, and the effective cutting width is the shortest distance among the distances between respective opposite sides of the polygonal structure; and when the ultrasonic osteotome bit is in the operating state shown in <FIG>, its effective cutting width is represented by b in <FIG>, and the effective cutting width is the longest distance among the distances between respective opposite sides of the polygonal structure. As shown in <FIG>, the effective cutting width a is not equal to the effective cutting width b, and the opposite sides having the effective cutting width a is perpendicular to the opposite sides having the effective cutting width b, so that the bit has two accurate cutting widths when axially rotating for cutting, and the accurate control of tissue cutting width can be achieved as long as the bit rotates <NUM> degrees. Of course, the ultrasonic osteotome bit may have any operating angle, and the cutting width of a biological tissue may be any value between the two accurate cutting widths. When the diameter of the bit is increased, more than two accurate cutting widths can be achieved by increasing the number of cross-sectional sides.

As shown in <FIG>, the tail end of the bit body <NUM> is provided with a threaded structure <NUM> to be connected to an ultrasonic device. In this example, the tail end of the bit body <NUM> is connected to an ultrasonic amplitude transformer. The threaded structure <NUM> may be an external threaded structure or an internal threaded structure. In this example, an external threaded structure is used. One end of the bit bar <NUM> is connected to the bit body <NUM>, and the bit bar <NUM> is in transitional connection with the bit body <NUM> through a bevel. The other end of the bit bar <NUM> is connected to the bit tip <NUM>, and the bit bar <NUM> is in transitional connection with the bit tip <NUM>. The ultrasonic osteotome bit may be of an one-piece structure or a multi-piece assembly structure. In this example, the ultrasonic osteotome bit uses an one-piece structure.

<FIG> show an ultrasonic osteotome bit according to a second example of the present disclosure. <FIG> is a first operating state view of an ultrasonic osteotome bit according to a second example of the present disclosure; <FIG> is a second operating state view of the ultrasonic osteotome bit according to the second example of the present disclosure. As shown in <FIG>, the ultrasonic osteotome bit according to the second example of the present disclosure has a structure substantially the same as the ultrasonic osteotome bit according to the first example of the present disclosure, except that a liquid flow hole <NUM> is provided in the ultrasonic osteotome bit according to the second example of the present disclosure. The liquid flow hole <NUM> comprises a longitudinal central hole of the bit body <NUM> and a drainage hole <NUM> penetrating the tail end of the longitudinal central hole of the bit body <NUM>. The longitudinal drainage hole <NUM> transversely extends in a direction perpendicular to the axis of the bit body. The tail end of the longitudinal central hole of the bit body <NUM> is at a connecting end, connected to the bit bar <NUM>, of the bit body <NUM>. A liquid flow may be introduced into the bit bar <NUM> through the liquid flow hole <NUM> and flow to the bit tip <NUM> under gravity so as to reduce the temperature of a cutting area. In this example, the drainage hole <NUM> vertically penetrates the tail end of the longitudinal central hole of the bit body <NUM>.

<FIG> is a schematic structural view of an ultrasonic osteotome bit according to a third example of the present disclosure. As shown in <FIG>, the ultrasonic osteotome bit according to the third example of the present disclosure has a structure substantially the same as the ultrasonic osteotome bit according to the second example of the present disclosure, except that the ultrasonic osteotome bit in the third example of the present disclosure is provided, at the bit tip <NUM>, with a knurled structure that extends from a foremost end face <NUM> of the bit tip <NUM> to the bit bar <NUM> to form a file-type bit. The knurled structure can reduce the contact area between the ultrasonic osteotome and bone tissues, which increase the ultrasonic power density of the tissue surface and is also beneficial to allow the knurled structure to provide a liquid flow path to drain liquid to a surface of the cut tissue for cooling. The foremost end face <NUM> of the bit tip <NUM> is machined into a convex structure.

As shown in <FIG>, in the ultrasonic osteotome bit according to the third example of the present disclosure, in the bit tip <NUM>, the length of the knurled structure, on the cutting face with the minimum cutting width, extending towards the bit bar <NUM> is greater than the length of the knurled structure, on the cutting face with the maximum cutting width, extending towards the bit bar <NUM>.

<FIG> is a schematic structural view of an ultrasonic osteotome bit according to a fourth example of the present disclosure. As shown in <FIG>, the ultrasonic osteotome bit according to the fourth example of the present disclosure has a structure substantially the same as the ultrasonic osteotome bit according to the third example of the present disclosure, except that in the ultrasonic osteotome bit in the fourth example of the present disclosure, the liquid flow hole <NUM> penetrates the bit body <NUM> and the bit bar <NUM> and extends to the longitudinal central through hole of the bit tip <NUM>. With such a design, a cooling liquid can be drained to reduce the temperature of the cutting area, and the debris of tissue cutting can be drawn out of the liquid flow hole under negative pressure so as to ensure the clear view of the surgical field. The foremost end face <NUM> of the bit tip <NUM> is machined into a concave structure.

The ultrasonic osteotome bit of the present disclosure can perform accurate cutting in multiple widths, which not only meets the requirement of a surgeon for the accuracy of bone cutting width, but also saves the time required to replace bits of different widths, thereby improving the surgical efficiency. The present disclosure has a simple structure and long service life, is convenient for adjusting the cutting width of the bit, is easy to operate, and has wide adjustable range.

Claim 1:
An ultrasonic osteotome bit, comprising a bit bar (<NUM>), a bit body (<NUM>) and a bit tip (<NUM>), with one end of the bit bar (<NUM>) being connected to the bit tip (<NUM>), and the other end of the bit bar (<NUM>) being connected to the bit body (<NUM>),
the bit tip (<NUM>) is of a cylindrical or substantially cylindrical structure with a cross section of a polygonal structure, wherein the bit tip (<NUM>) has at least two cutting faces characterized by the at least two cutting faces having different cutting widths (a, b) for generating different tissue cutting widths,
wherein the shortest distance among the distances between respective opposite sides of the polygonal structure is not equal to the longest distance among the distances between respective opposite sides of the polygonal structure, and the two opposite sides having the shortest distance are perpendicular to the two opposite sides having the longest distance, so that the bit tip (<NUM>) has at least two cutting widths (a, b), and
wherein a first cutting width (a) of the at least two cutting widths is equal to the shortest distance, and a second cutting width (b) of the at least two cutting widths is equal to the longest distance.