Medical hook

Abstract

To provide a medical hook which attains stable holding by having a shaft with suitable rigidity and whose plate can be bent by a hand.SOLUTION: A medical hook (1) comprises: a shaft (10) having a bar-like shape; and a plate (20) connected to a first end (10A) being one end of the shaft (10) and having a plate-like shape. The shaft (10) and the plate (20) are constituted from austenite stainless steel. A metallographic structure of the austenite stainless steel constituting the shaft (10) includes an austenite phase and a chrome carbide. A metallographic structure of the austenite stainless steel constituting the plate (20) is constituted from a single phase of an austenite phase.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a medical hook. [Background technology]

[0002] There is known a medical hook made of a metal material that can be bent by hand by the user (see, for example, Patent Document 1). Patent Document 1 proposes a medical hook that uses an alloy whose main component is tin and whose hardness is adjusted by adding silver, and has a plate part (spatula part) connected to the tip of a shaft part (arm part). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-74120 A Summary of the Invention [Problem to be solved by the invention]

[0004] In medical hooks, it is sometimes required that the shaft portion, which is held by the user or a jig, has appropriate rigidity to achieve stable holding, while the plate portion can be bent by hand by the user.

[0005] One of the objects of the present disclosure is to provide a medical hook in which the shaft portion has appropriate rigidity to achieve stable holding, while the plate portion can be bent by hand. [Means for solving the problem]

[0006] The medical hook of the present disclosure includes a shaft portion having a rod shape and a plate portion having a plate shape connected to a first end portion that is one end portion of the shaft portion. The shaft portion and the plate portion are made of austenitic stainless steel. The metal structure of the austenitic stainless steel constituting the shaft portion includes an austenite phase and chromium carbide. The metal structure of the austenitic stainless steel constituting the plate portion is composed of a single austenite phase.

Advantages of the Invention

[0007] According to the above medical hook, it is possible to provide a medical hook that can achieve stable holding by having the shaft portion with appropriate rigidity and can be bent by hand at the plate portion.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0009] [Outline of the Embodiment] The medical hook according to the present disclosure includes a shaft portion having a rod shape and a plate portion having a plate shape connected to a first end portion that is one end portion of the shaft portion. The shaft portion and the plate portion are made of austenitic stainless steel. The metal structure of the austenitic stainless steel constituting the shaft portion includes an austenite phase and chromium carbide. The metal structure of the austenitic stainless steel constituting the plate portion is composed of a single austenite phase.

[0010] In the medical hook of the present disclosure, the metal structure of the austenitic stainless steel constituting the shaft portion is supposed to include an austenite phase and chromium carbide. Thereby, appropriate rigidity (second moment of area) can be imparted to the shaft portion. On the other hand, the metal structure of the austenitic stainless steel constituting the plate portion is supposed to be composed of a single austenite phase. Thereby, the plate portion can be imparted with the property that the user can bend it by hand (plastic deformation). Thus, according to the medical hook of the present disclosure, it is possible to provide a medical hook that can achieve stable holding by having appropriate rigidity in the shaft portion and can bend the plate portion by hand.

[0011] In the above medical hook, the first end portion and the plate portion may be connected by welding. Thereby, the shaft portion and the plate portion can be easily and firmly connected.

[0012] In the above medical hook, the austenitic stainless steel constituting the plate portion may be JIS standard SUS304. SUS304, which can obtain appropriate plastic deformation ability by making the metal structure composed of a single austenite phase, is suitable as the material constituting the plate portion.

[0013] In the above medical hook, the austenitic stainless steel constituting the shaft portion may be JIS standard SUS304. SUS304, which can obtain appropriate rigidity by making the metal structure contain an austenite phase and chromium carbide, is suitable as the material constituting the shaft portion.

[0014] In the above medical hook, the plate portion may include a main body portion including a region connected to the shaft portion, and a tip portion located on the side opposite to the shaft portion when viewed from the main body portion and having a smaller thickness than the main body portion. With this configuration, it becomes easy for the plate portion to enter a narrow gap between human or animal tissues.

[0015] In the above-described medical hook, the tip portion may become thinner as it moves away from the main body portion. With this configuration, it becomes even easier to insert the plate portion into a narrow gap in a human body or an animal tissue.

[0016] In the above-described medical hook, the plate portion and the shaft portion may be made of the same type of austenitic stainless steel. With this configuration, differences in physical properties such as the linear expansion coefficient between the plate portion and the shaft portion can be suppressed. As a result, distortion of the plate portion with respect to the shaft portion and the like can be suppressed.

[0017] [Specific Example of Embodiment] Next, an example of a specific embodiment of the medical hook of the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals and their descriptions will not be repeated.

[0018] FIG. 1 is a schematic perspective view showing the structure of a medical hook. FIG. 2 is a schematic plan view showing the structure of the medical hook. FIG. 3 is a schematic cross-sectional view showing the structure of the plate portion. In FIGS. 1 to 3, the direction corresponding to the longitudinal direction of the shaft portion 10 is the X-axis direction. The direction corresponding to the width direction of the plate portion 20 is the Y-axis direction. The direction corresponding to the thickness direction of the plate portion 20 is the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are orthogonal to each other. FIG. 2 is a plan view of the medical hook 1 viewed in the thickness direction (Z-axis direction) of the plate portion 20. FIG. 3 is a cross section along the line segment III-III of FIG. 2 and shows a cross section in the X-Z plane.

[0019] Referring to FIGS. 1 to 3, the medical hook 1 of the present embodiment includes a shaft portion 10 and a plate portion 20. The shaft portion 10 has a rod-like shape that linearly extends along the X-axis direction from the first end portion 10A to the second end portion 10B.

[0020] The shaft portion 10 is made of austenitic stainless steel. Although various materials can be adopted as the austenitic stainless steel constituting the shaft portion 10, JIS standard SUS304 is adopted in the present embodiment. The metal structure of the austenitic stainless steel constituting the shaft portion 10 includes an austenite phase and chromium carbide. More specifically, the metal structure of SUS304 constituting the shaft portion 10 is a two-phase structure composed of a matrix phase composed of an austenite phase and chromium carbide precipitated in the matrix phase.

[0021] The plate portion 20 is connected to the first end portion 10A of the shaft portion 10. The first end portion 10A and the plate portion 20 can be connected in various manners, but in the present embodiment, they are connected by welding. The plate portion 20 has a plate-like shape extending from the base end 20B to the tip end 20A. As shown in FIG. 2, the width of the plate portion 20 in the present embodiment becomes smaller as it approaches the tip end 20A from the base end 20B.

[0022] The plate portion 20 is made of austenitic stainless steel. Although various materials can be adopted as the austenitic stainless steel constituting the plate portion 20, JIS standard SUS304 is adopted in the present embodiment. That is, in the present embodiment, the plate portion 20 and the shaft portion 10 are made of the same type of austenitic stainless steel (SUS304). The metal structure of the austenitic stainless steel constituting the plate portion 20 is composed of a single austenite phase. More specifically, the metal structure of SUS304 constituting the plate portion 20 is composed only of an austenite phase and does not contain chromium carbide.

[0023] Referring to FIG. 3, the plate portion 20 includes a main body portion 21 and a tip portion 22. The main body portion 21 includes a region connected to the shaft portion 10. The main body portion 21 includes a base end 20B. The tip portion 22 is located on the side opposite to the shaft portion 10 when viewed from the main body portion 21. The tip portion 22 includes a tip 20A. The tip portion 22 is thinner than the main body portion 21. The tip portion 22 becomes thinner as it moves away from the main body portion 21. The tip portion 22 has a tapered shape in the width direction and the thickness direction. The thickness of the plate portion 20 is not particularly limited, but can be, for example, 1 mm or less, and further 0.8 mm or less.

[0024] In the medical hook 1 of the present embodiment, the metal structure of the austenitic stainless steel constituting the shaft portion 10 is supposed to include an austenite phase and chromium carbide. Thereby, appropriate rigidity can be imparted to the shaft portion 10. On the other hand, the metal structure of the austenitic stainless steel constituting the plate portion 20 can be supposed to be composed of a single austenite phase. Thereby, the plate portion 20 can be imparted with the property that it can be bent (plastically deformed) by hand by the user. Thus, in the medical hook 1 of the present embodiment, while the shaft portion 10 has appropriate rigidity to achieve stable holding, the plate portion 20 can be bent by hand.

[0025] Also, in the medical hook 1 of the present embodiment, the plate portion 20 includes a tip portion 22 that is thinner than the main body portion 21. This makes it easier for the plate portion 20 to enter a narrow gap in the human body or animal tissue.

[0026] Note that the planar shape of the plate portion 20 is not limited to the shape described above, and various planar shapes can be adopted according to the application. Also, the thickness of the plate portion 20 may be constant throughout the whole area.

[0027] Next, an example of the manufacturing method of the medical hook 1 in the present embodiment will be described. FIG. 4 is a flowchart showing an outline of the manufacturing process of the medical hook. Referring to FIG. 4, in the manufacturing method of the medical hook 1 in the present embodiment, first, as step S10, a raw material steel plate preparation step is carried out. In this step S10, first, a steel plate (stainless steel plate) made of SUS304 is prepared. The thickness of the steel plate can be appropriately selected according to the thickness of the desired plate portion 20. For example, the thickness of the steel plate can be 1 mm or less.

[0028] Next, as step S20, a cutting step is carried out. In this step S20, cutting is performed on the stainless steel plate prepared in step S10, whereby a plate portion 20 having a desired shape is produced. The method of cutting is not particularly limited. For example, laser cutting may be employed. Although not an essential procedure, chamfering, polishing, etc. may be carried out on the outer edge of the obtained plate portion 20.

[0029] Next, as step S30, a plastic working step is carried out. This step S30 is not an essential step. If necessary, plastic working such as bending is carried out on the plate portion 20 obtained in step S20.

[0030] Next, as step S40, a tip portion forming step is carried out. In this step S40, a tip portion 22 is formed on the plate portion 20. The tip portion 22 can be formed, for example, by cutting.

[0031] Next, a solution heat treatment process is performed as process S50. In this process S50, a solution heat treatment is performed on the plate portion 20 obtained by performing up to process S40. Specifically, for example, a heat treatment is performed to heat the plate portion 20 in a temperature range of 1000°C or higher and 1050°C or lower. As a result, the chromium carbides present in the metal structure of SUS304 constituting the plate portion 20 dissolve in the austenite phase, which is the matrix phase. As a result, the metal structure of SUS304 constituting the plate portion 20 comes to be composed of a single austenite phase. Thereby, the plate portion 20 is completed. After this process, surface oxidation treatment, shot blasting treatment, etc. may be performed to suppress the gloss of the surface.

[0032] Next, a shaft portion joining process is performed as process S60. In this process S60, a separately prepared shaft portion 10 is connected to the plate portion 20 obtained by performing processes S10 to S50. Specifically, first, for example, a bar made of SUS304 is subjected to turning or the like to obtain a shaft portion 10 having a desired shape. Here, the metal structure of SUS304 constituting the bar that is the material of the shaft portion 10 contains an austenite phase and chromium carbides. Then, welding is performed in a state where the first end portion 10A of the shaft portion 10 and the plate portion 20 are in contact. The welding may be, for example, laser welding. Thereby, a medical hook 1 in which the plate portion 20 is connected to the first end portion 10A of the shaft portion 10 is obtained.

[0033] Next, a finishing process is performed as process S70. In this process S70, a finishing process is performed on the medical hook 1 obtained by performing processes S10 to S60 as necessary. In this process, for example, a finishing process such as deburring the surface is performed. The medical hook 1 of the present embodiment is completed by the above procedure.

[0034] In the above-described embodiment, the case where the shaft portion 10 has a linear shape has been described. However, the medical hook of the present disclosure is not limited to this, and it may have one or more bent portions. Further, the shape of the plate portion 20 is not limited to the shape described above, and any shape can be adopted. The medical hook of the present disclosure is used for human or animal surgeries, etc., and can be used for various medical procedures such as holding a surgical wound, holding tissues such as organs, pressing and discharging, and peeling.

[0035] It should be understood that the embodiments disclosed this time are illustrative in all respects and not restrictive in any way. The scope of the present invention is defined not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims be included.

Explanation of Reference Numerals

[0036] 1 Medical hook, 10 Shaft portion, 10A First end portion, 10B Second end portion, 20 Plate portion, 20A Tip, 20B Base end, 21 Main body portion, 22 Tip portion.

Claims

1. a shaft portion having a rod-like shape; a plate portion having a plate shape connected to a first end portion which is one end portion of the shaft portion, the shaft portion and the plate portion are made of austenitic stainless steel, the metal structure of the austenitic stainless steel constituting the shaft portion includes an austenite phase and chromium carbide; The metal structure of the austenitic stainless steel constituting the plate portion is composed of a single austenite phase.

2. The medical hook according to claim 1 , wherein the first end portion and the plate portion are connected by welding.

3. 2. The medical hook according to claim 1, wherein the austenitic stainless steel constituting the plate portion is JIS standard SUS304.

4. 2. The medical hook according to claim 1, wherein the austenitic stainless steel constituting the shaft portion is JIS standard SUS304.

5. The plate portion is a main body portion including a region connected to the shaft portion; The medical hook according to claim 1 , further comprising: a tip portion that is located on the opposite side of the main body portion from the shaft portion and has a thickness smaller than that of the main body portion.

6. The medical hook according to claim 5 , wherein the thickness of the tip portion decreases with increasing distance from the main body portion.

7. 7. The medical hook according to claim 1, wherein the plate portion and the shaft portion are made of the same type of austenitic stainless steel.

Images