CN108158670B - Depth cursor - Google Patents

Abstract

The invention provides a depth cursor and a method for marking the depth of a bone needle by using the depth cursor. The depth cursor comprises: a clamping portion that can be opened to perform a clamping action; and an elastic restoring force applying part which provides an elastic restoring force to the clamping part so that the clamping part can return to the original position under the action of the elastic restoring force after being opened. The depth cursor can be quickly fixed or detached from the bone needle, and the scale is not needed to be carved on the bone needle.

Description

Depth cursor

Technical Field

The invention relates to an orthopedic surgical instrument, in particular to a cursor for marking the depth of a guide needle of an orthopedic surgical robot entering a bone.

Background technique

During medical surgeries that use orthopedic surgical robots for assisted positioning and guidance, it is very important to control the depth at which the bone needle enters the bone. This requires that the bone needle insertion process be accompanied by significant markings to identify the depth at which the bone needle enters.

Current practices include: 1. Carving digital scales on the surface of the bone needle to identify the depth and control the insertion depth; 2. Using a sleeve to cover the bone needle and fixing the sleeve to the bone needle by bolting through the threaded holes in the sleeve wall to use it as a marker to mark the depth; 3. Using a soft material such as plasticine attached to the surface of the bone needle as a marker to mark the depth.

However, the above method still has defects: 1. When engraving digital scales on the surface of the bone needle, the digital mark is too small and cannot be clearly identified during surgery; 2. When using a sleeve to cover the bone needle, the threaded fixing sleeve requires the use of tools, which is inconvenient to operate and affects the operation time; 3. Using soft materials to attach to the bone needle can only be used as a temporary emergency measure, and the attachment strength cannot be guaranteed. The soft material is easy to fall off the surface of the bone needle when the bone needle moves.

Summary of the invention

In order to overcome the existing problems, the present invention aims to provide a depth cursor for an orthopedic surgical robot, which can be quickly fixed to or removed from a bone needle without engraving scales on the bone needle.

The first aspect of the present invention provides a depth cursor, which includes: a clamping portion, which can be opened to perform a clamping action; and an elastic restoring force applying portion, which provides an elastic restoring force to the clamping portion, so that the clamping portion can return to its original position under the action of the elastic restoring force after opening.

The depth cursor of the present invention can be quickly and conveniently fixed to a predetermined position on a bone needle without any additional tools, and is easy to disassemble, thereby saving operation time. The depth cursor can prominently display the position where the cursor is fixed to the bone needle, and it is easy to observe and judge the depth of the bone needle entering the patient's bone. In addition, there is no need to form a carved mark on the bone needle, so that the surface of the bone needle can be kept smooth, so that the bone needle can be driven into the bone more smoothly.

In at least one embodiment, the elastic restoring force applying portion includes: an elastic force generating portion, which is formed by an elastic member formed into an arc shape; and an arm portion, which is respectively arranged at both ends of the elastic force generating portion and extends toward the same side of the elastic force generating portion, and the clamping portion is arranged on the arm portion.

By utilizing the elastic restoring force applying portion composed of the elastic force generating portion and the arm portion, the depth cursor can be firmly fixed at a predetermined position on the bone needle only by the elastic restoring force of the depth cursor itself without the assistance of external force.

In at least one embodiment, in at least one of the two arms disposed at both ends of the elastic force generating portion, a recess for clamping a bone needle is disposed at a position closest to the other arm, and the recess constitutes the clamping portion. The recess can accommodate the bone needle, which is beneficial for fixing the bone needle and preventing the bone needle from sliding.

In at least one embodiment, a guide portion is also provided in at least one of the arm portions, the guide portion comprising a base end and a free end, the base end being adjacent to the clamping portion, the free end being located on a side of the base end away from the elastic force generating portion, and the guide portion is formed into a gradually opening shape, the guide portion being capable of guiding the bone needle to move into the clamping portion.

In at least one embodiment, the guide portion is disposed in each of the two arm portions, and the guide portions in the two arm portions cooperate with each other to form a substantially "V" shape.

In at least one embodiment, in the arm portion, a protrusion for holding is formed on a side opposite to the side where the clamping portion is located, which can play an anti-slip role when holding.

In at least one embodiment, in the case where an imaginary straight line is formed by connecting both ends of the elastic force generating portion, a middle portion of the elastic force generating portion and the arm portion are located on opposite sides of the imaginary straight line, respectively.

In at least one embodiment, the arm is provided with an identification portion for indicating the specification of the depth cursor, so as to facilitate and quickly distinguish depth cursors of different specifications.

In at least one embodiment, the elastic restoring force applying portion and the clamping portion are integrally formed.

The second aspect of the present invention provides a method for marking the depth of a bone needle, the method using the depth cursor, the method comprising: opening the clamping portion of the depth cursor to form a gap larger than the outer diameter of the bone needle; allowing the bone needle to enter the gap formed by the clamping portion; moving the depth cursor along the length direction of the bone needle while keeping the clamping portion open until the depth cursor is located at a predetermined position on the bone needle; and closing the clamping portion under the action of the elastic restoring force, thereby fixing the depth cursor on the bone needle.

By utilizing the method for marking the depth of a bone needle of the present invention, the depth cursor and the bone needle can be quickly and conveniently fixed and disassembled, and the depth cursor can be firmly fixed without the need for additional tools, thereby saving operation time.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a perspective view of a depth cursor according to an embodiment of the present invention.

Description of Reference Numerals

1 convex portion, 2 concave portion, 3 elastic force generating portion, 4 guide portion, 5 arm portion, 6 marking portion.

Detailed ways

The exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present invention, and are not intended to exhaust all possible modes of the present invention, nor to limit the scope of the present invention.

As shown in FIG1 , the depth cursor includes: an elastic force generating portion 3, which is formed by an elastic member formed into an arc shape; two arm portions 5, which are respectively connected to the two ends of the elastic force generating portion 3 and extend toward the same side of the elastic force generating portion 3. Among them, a recess 2 for clamping a bone needle is formed at a position closest to the other arm portion 5 in any one of the arm portions 5, and the recess 2 is formed into an arc-shaped depression that can surround and accommodate the bone needle. The recess 2 is used as an example of the clamping portion of the present invention. The axial direction of the arc-shaped depression of the recess 2 can be formed to be perpendicular to the direction in which the bone needle enters the recess 2.

Fig. 1 shows the depth cursor in the initial state, at which time the depth cursor is not mounted on the bone needle and no external force is applied. In order to ensure that the recess 2 can clamp the bone needle, the distance between the two recesses 2 in the state shown in Fig. 1 is designed to be smaller than the outer diameter of the bone needle.

The two arm portions 5 are also formed with a guide portion 4, which can guide the movement of the bone needle into the recess 2. The guide portion 4 includes a base end and a free end, wherein the base end is adjacent to the recess 2, and the free end is located on the side of the base end away from the elastic force generating portion 3. The distance between the base ends of the two guide portions 4 is smaller than the distance between the free ends of the two guide portions 4. For example, the two guide portions 4 can be formed into a substantially "V"-shaped opening as shown in FIG. 1.

As shown in Fig. 1, assuming that A represents the end point of the elastic force generating part 3, an imaginary straight line A-A is formed by connecting the two end points A of the elastic force generating part 3. At this time, the middle part of the elastic force generating part 3 and the arm part 5 are respectively located on the opposite sides of the imaginary straight line A-A, and the middle part of the elastic force generating part 3 is bent so that the elastic force generating part 3 is in a bow shape or an arch shape.

In the arm 5, a convex portion 1 may be formed on the side opposite to the concave portion 2, which can prevent slipping during hand-held operation. When a plurality of convex portions 1 are formed, a wavy outer contour is generated, thereby further improving the anti-slip effect.

The arm 5 is also provided with a marking portion 6. For example, a number or pattern indicating the size of the depth cursor may be provided in the marking portion 6 to facilitate rapid distinction of depth cursors of different sizes. The marking portion 6 may be formed by engraving numbers on the arm 5.

The following describes a method for marking the depth of a bone needle using the depth cursor of this embodiment. The method includes the following steps.

First step: the operator holds the protrusions 1 of the two arms 5 of the depth cursor and opens the two arms 5 to such an extent that a gap larger than the outer diameter of the bone needle is formed between the two recesses 2 .

Step 2: Use the opening between the two guide parts 4 to guide the bone needle into the gap formed by the two recesses 2. At this time, you can either move the depth cursor close to the bone needle or move the bone needle close to the depth cursor, as long as you can guide the bone needle into the above gap.

Step 3: Move the depth cursor along the length direction of the bone needle with the two arms 5 open until the depth cursor is at the predetermined position on the bone needle. For example, assuming that the depth of the bone needle to be driven in is 3 cm, in this step, the depth cursor is moved to the predetermined position 3 cm away from the tip of the bone needle. Note that 3 cm here is only an exemplary explanation for the convenience of understanding the "predetermined position" and does not mean a limitation on the specific depth of the bone needle.

Step 4: The operator releases his grip on the depth cursor, allowing the two arms 5 to close under the action of the elastic restoring force generated by the elastic force generating part 3, so that the two clamping parts (recesses 2) clamp the bone needle, so that the depth cursor is fixed at a predetermined position on the bone needle.

By using the method including the above four steps according to this embodiment, the depth cursor is fixed at the predetermined position on the bone needle by a very simple and quick operation. In this way, during the operation, it can be clearly seen that the depth of the bone needle entering the bone reaches the predetermined depth. In addition, when removing the depth cursor, it is only necessary to hold the depth cursor and apply force to open the two arms 5 to release the depth cursor from the bone needle, so that the depth cursor can be removed conveniently and quickly.

Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make various changes and modifications to the above-mentioned embodiments of the present invention under the guidance of the present invention without departing from the scope of the present invention.

(1) In the above embodiment, the guide portions 4 of the two arms 5 are straight lines, forming a substantially "V" shape, but the present invention is not limited thereto, and the guide portions may also be arcs, forming a substantially "eight" shape.

(2) In the above embodiment, the recess 2 is formed to surround and accommodate the bone needle, but it can also be a recess in other shapes, such as a V-shaped groove.

(3) The depth cursor of the above-mentioned embodiment is used to mark the insertion depth of the bone needle, and can also be used to mark the depth of other needle-using occasions, such as manual surgery, acupuncture, etc.

(4) The clamping portion (recessed portion 2) in the above embodiment is not limited to the case where it is formed in the two wall portions 5 as shown in FIG. 1 , and the clamping portion may be formed in only one of the arm portions.

(5) The guide portion 4 in the above embodiment is not limited to the case where it is formed on the two wall portions 5 as shown in FIG. 1 , and the guide portion may be formed on only one of the arm portions.

Claims (6)

1. A depth cursor for an orthopaedic surgical robot, characterized in that it is for identifying the depth of insertion of a bone needle and comprises:

a clamping portion that can be opened to perform a clamping action; and

An elastic restoring force applying part which provides an elastic restoring force to the clamping part so that the clamping part can return to the original position under the action of the elastic restoring force after being opened,

The elastic restoring force applying section includes:

An elastic force generating portion formed of an elastic member formed in an arc shape; and

Arms respectively provided at both ends of the elastic force generating portion and extending toward the same side of the elastic force generating portion, and

The clamping part is arranged on the arm part,

The arm is provided with a marking part for representing the depth cursor specification,

At least one of the two arm portions provided at both ends of the elastic force generating portion is provided with a recess for holding a bone needle at a position closest to the other arm portion, and the recess constitutes the holding portion.

2. A depth cursor for an orthopedic surgical robot according to claim 1, characterized in that a guide portion is further provided in at least one of the arm portions, the guide portion including a base end and a free end, the base end being contiguous with the clamping portion, the free end being located on a side of the base end remote from the elastic force generating portion, and the guide portion being formed in a gradually opened open shape.

3. A depth cursor for an orthopaedic surgical robot according to claim 2, wherein the guide portions are provided in both of the arm portions, and the guide portions in both of the arm portions cooperate with each other to form a substantially "V" shape.

4. The depth vernier for an orthopedic surgical robot according to claim 1, wherein a convex portion for gripping is formed in the arm portion on a side opposite to the side on which the grip portion is located.

5. The depth vernier for an orthopedic surgical robot according to claim 1, wherein in a case where an imaginary straight line is formed by connecting both ends of the elastic force generating part, a middle portion of the elastic force generating part and the arm portion are located on opposite sides of the imaginary straight line, respectively.

6. A depth cursor according to any one of claims 1 to 5, wherein the resilient restoring force applying portion and the gripping portion are integrally formed.