CN112754589A

CN112754589A - Saw blade

Info

Publication number: CN112754589A
Application number: CN202110060960.7A
Authority: CN
Inventors: 吴世齐
Original assignee: Shenzhen Haisi Medical Co ltd
Current assignee: Shenzhen Haisi Medical Co ltd
Priority date: 2020-03-08
Filing date: 2021-01-22
Publication date: 2021-05-07

Abstract

The invention discloses a saw blade, comprising: the saw blade body is provided with a relative near-end side and a far-end side, the near-end side is provided with an interface connected with the power tool, and the far-end side is provided with sawteeth; the guide plate is connected with the saw blade body and can slide on the saw blade body along the longitudinal direction; a height difference is formed between the lower surface of the saw blade body and the lower surface of the guide plate, and the height difference is utilized to control the thickness of the cut bone when the bone is cut in the operation. The saw blade of the present invention can be independently used to cut a bone amount of a corresponding thickness in an artificial joint replacement surgery without the need of intraoperatively installing and using a complicated positioning surgical instrument to assist the bone cutting, thereby reducing the time required for the surgery and the workload of a surgeon.

Description

Saw blade

Technical Field

The invention relates to a surgical cutting instrument, and belongs to the technical field of medical instruments.

Background

In modern artificial joint replacement surgery, medical saw blades are widely mounted on hand-held power tools for cutting bone tissue. Among the more common forms are the pendulum saw blade and the reciprocating saw blade (hereinafter referred to as saw blade), which are basically long strips. One end of the saw blade is designed with a structure for coupling with a power tool, and the other end is designed with a tooth shape. The working principle is that the power tool provides power to drive the far end (the toothed end) of the saw blade to do left-right swinging or back-forth reciprocating motion, thereby cutting bone tissues.

In order to precisely cut bone tissue, it takes a long time for a surgeon to install a related positioning and measuring surgical instrument on the bone tissue of a patient, and then insert a saw blade into a guide groove of the positioning instrument, thereby cutting the corresponding bone tissue. The time of the procedure increases considerably during the procedure, thereby increasing the workload of the physician and the time for the patient to recover.

Disclosure of Invention

The invention mainly aims to provide a saw blade capable of controlling the thickness of a bone cutting, which can avoid the increase and inconvenience of operation time caused by using complicated positioning operation instruments to determine the bone cutting direction and size in an operation.

In order to achieve the above object, the present invention provides a saw blade, which comprises a blade body and a guide plate integrally connected to each other, wherein the guide plate is slidable relative to the blade body along a longitudinal axis of the blade body.

In the operation (such as the artificial knee joint replacement operation), if the bone quantity with the thickness of 1.5 mm needs to be cut, the thickness of the saw blade body only needs to be designed to be 1.5 mm, so the distance between the lower surface of the saw blade body and the lower surface of the guide plate is 1.5 mm thick, and the lower surface of the guide plate can be lapped on the corresponding surface of the bone, so when the saw blade swings and moves forwards towards the far end direction of the saw blade to cut the bone tissue, the bone quantity with the thickness of one saw blade body is just cut.

Furthermore, a plate with corresponding thickness can be added between the saw blade body and the guide plate, the distance between the lower surface of the guide plate and the lower surface of the saw blade body is also increased by the thickness of a thickness plate, the thickness of the cut bone tissue also comprises the thickness of the thickness plate, and the whole bone cutting amount is increased.

The saw blade body can be provided with a long groove for accommodating two elastic pieces protruding out of the guide plate, and the elastic pieces slide in the long groove to achieve the purpose of guiding.

Further, the cross section of the elongated slot is wedge-shaped, and the corresponding protruding part of the cross section of the spring plate is also wedge-shaped, so that wedge-shaped engagement is formed, in which case the blade body cannot be separated from the spring plate on the guide plate.

Furthermore, a locking component is arranged between the two elastic pieces, so that the elastic pieces can be prevented from bending and deforming towards the middle and being separated from the saw blade body.

Furthermore, the guide plate can be provided with at least one window, and scales on the saw blade body can be observed through the window, so that the relative position between the guide plate and the saw blade body can be judged.

Further, the blade body may be a reciprocating blade capable of reciprocating.

Further, the portion of the distal end of the blade body that is required to contact bone tissue may be contoured to match the shape of bone.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic illustration of an alternative saw blade body configuration according to an embodiment of the present invention;

FIG. 2 is a schematic view of the blade body and the fence shown mounted together on the rear side of the shaft;

FIG. 3 is a front elevational view of the blade body and fence shown mounted together;

FIG. 4 is a schematic axial view of the blade guard showing the two spring plate configuration;

FIG. 5 is a cross-sectional structural schematic view of the blade body with the fence and locking member mounted together;

FIG. 6 is a schematic axial view of another embodiment of the blade body and guide plate connection;

FIG. 7 is a schematic cross-sectional view of the blade body with the fence and locking member mounted together and in an isometric configuration;

FIG. 8 is a front elevational view of the saw blade body with the fence and thickness plate mounted together, with the thickness plate added as compared to FIG. 3;

FIG. 9 is a schematic rear view of the saw blade body with the fence and locking member mounted together to show the fence windowing structure and the graduations on the saw blade body;

FIG. 10 is a schematic back side axial view of the saw blade body and the guide plate together showing the curved configuration of the distal end of the guide plate engaging bone tissue;

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

A saw blade according to an embodiment of the present invention, as shown in FIGS. 1 and 2, includes a blade body having a proximal end side 10 coupled to a power tool, and a long groove 70 formed in the middle of the blade body, as shown in FIG. 5, the cross-section of the long groove being a wedge 90, and as shown in FIGS. 3 and 4, two resilient pieces 80 are formed on the guide plate, and distal ends of the resilient pieces have wedges 90 protruding from a lower surface of the guide plate, and the guide plate is pressed into the blade body after the two resilient pieces are aligned with the long groove, at which time, as shown in FIG. 5, the wedge structures formed on the resilient pieces are just engaged with the wedges formed on the long groove.

At this time, as shown in fig. 2, the guide plate and the saw blade body are kept as a whole and can slide along the longitudinal axis 30 direction of the saw blade, the front end of the guide plate can be lapped on the head of the cut bone in the operation, the saw blade body is driven by the power tool to swing and move forwards along the longitudinal axis direction to cut the bone tissue, and the thickness 60 of the cut bone tissue is the distance between the lower surface of the saw blade body and the lower surface of the guide plate.

As shown in fig. 7, if the guide plate and the saw blade body need to be locked in operation, a locking part 110 can be added, and after the locking part is filled between the two elastic pieces, the elastic pieces have no space to bend and deform and are separated from the long groove.

As shown in fig. 9, the guide plate has a window through which the scale on the saw blade body is observed, so that the relative position between the guide plate and the saw blade body is judged to know the depth of the bone.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. A saw blade capable of controlling the thickness of a bone cut, comprising:

a blade body having opposite proximal (10) and distal (20) sides, the proximal side having an interface for connection to a power tool and the distal side having teeth; a guide plate coupled to the blade body and slidable on the blade body in a longitudinal direction (30); the surgical saw is characterized in that a height difference (60) is formed between the lower surface (40) of the saw blade body and the lower surface (50) of the guide plate, and the thickness of the cut bone is controlled during the bone cutting in the operation.

2. The saw blade of claim 1, wherein said blade body includes a longitudinal slot (70), and said guide plate includes two projecting resilient tabs (80) that slide within said slot.

3. Saw blade according to claim 2, wherein the cross-section of the elongated slot is wedge-shaped (90).

4. The saw blade as claimed in claim 2, wherein the longitudinal slot (100) of the sliding structure is provided on a guide plate, and the blade body slides in the slot on the guide plate.

5. The saw blade as claimed in claim 2, comprising a locking member (110) for locking the mutual movement between the fence and the blade body.

6. The saw blade of claim 1, wherein the blade body is a reciprocating saw blade.

7. The saw blade as claimed in claim 1, wherein a thickness plate (120) is installed between the blade body and the guide plate for adjusting the thickness of the osteotomy.

8. The saw blade as in claim 1, wherein the blade body has at least one scale (130) and the fence has at least one window (140).

9. The saw blade as claimed in claim 1, wherein the guide surface (150) on the guide plate is a curved surface that matches the bone.