US20130197549A1 - Edged medical cutting tool - Google Patents
Edged medical cutting tool Download PDFInfo
- Publication number
- US20130197549A1 US20130197549A1 US13/876,739 US201113876739A US2013197549A1 US 20130197549 A1 US20130197549 A1 US 20130197549A1 US 201113876739 A US201113876739 A US 201113876739A US 2013197549 A1 US2013197549 A1 US 2013197549A1
- Authority
- US
- United States
- Prior art keywords
- edge
- plane portion
- cutting tool
- trocar
- plane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/04—Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
- A61B17/06—Needles ; Sutures; Needle-suture combinations; Holders or packages for needles or suture materials
- A61B17/06066—Needles, e.g. needle tip configurations
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/3209—Incision instruments
- A61B17/3211—Surgical scalpels, knives; Accessories therefor
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/16—Polishing
- C25F3/22—Polishing of heavy metals
- C25F3/24—Polishing of heavy metals of iron or steel
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00526—Methods of manufacturing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
- A61F2250/005—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in colour
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/007—Methods or devices for eye surgery
- A61F9/013—Instruments for compensation of ocular refraction ; Instruments for use in cornea removal, for reshaping or performing incisions in the cornea
- A61F9/0133—Knives or scalpels specially adapted therefor
Definitions
- the present invention relates to a sharply-edged medical cutting tool for incising a biological tissue with an improved piercing property.
- a knife or trocar is employed to pierce an eyeball or incise a cornea or sclera, and a suture needle for piercing or incising a muscle or a skin is employed to suture an affected area.
- a medical cutting tool such a knife, a trocar, or a suture needle includes a sharp tip, a sharp edge elongated from the sharp tip, a plane portion that forms the edge, and a body portion continuously elongated from the plane portion.
- the edge and the plane portion have cross sections having a polygonal shape such as a triangle, a rectangle, or a pentagon.
- the shape of the cross section is set according to a type of a desired medical cutting tool, that is, according to whether the medical cutting tool is a knife, a trocar, or a suture needle.
- two edges are formed by using the sharp tip as a starting point (for example, see Patent Literature 1).
- the medical cutting tool having the aforementioned configuration it is necessary to reduce impalement resistance generated during the incision of the affected area. For example, if the impalement resistance is large, a doctor may feel fatigued, and may not accurately perform a surgical operation. For this reason, a manufacturer of a medical cutting tool has an important issue to improve a medical cutting tool including a knife, a trocar, and a suture needle having reduced impalement resistance.
- the present invention provides an edged medical cutting tool having reduced impalement resistance.
- the inventors have made many development experiments. As a result, the inventors have found a fact that the impalement resistance is reduced by providing a sharp edge. In addition, the inventors have recognized that the sharp edge can be implemented by performing an electrolytic polishing process or a chemical polishing process within a short time after a polishing process.
- the inventors have also recognized that a color of one plane portion along the edge is different from that of the other plane portion when the sharp edge is configured by performing an electrolytic polishing process or a chemical polishing process and the polishing process is performed within a short time. Furthermore, the inventors have also recognized that the chromium content of one plane portion along the edge is different from that of the other plane portion when a stainless steel is employed as a material.
- a medical cutting tool including: a sharp edge for incising a biological tissue; and plane portions that form the edge, wherein a color of one plane portion along the edge is different from that of the other plane portion.
- a color difference between one plane portion along the edge and the other plane portion is based on a thickness difference of an oxide film.
- an edged medical cutting tool made of an austenitic stainless steel, including: a sharp edge for incising a biological tissue; and plane portions that form the edge, wherein a chromium content of one plane portion along the edge is larger than a chromium content of the other plane portion.
- edged medical cutting tool (hereinafter, simply referred to as a cutting tool) according to the present invention, it is possible to reduce impalement resistance by forming a sharp edge. Therefore, during an ophthalmic surgical operation or a general surgical operation, it is possible to alleviate fatigue of a doctor and accurately perform the incision.
- the formation of the sharp edge can be recognized by checking a color difference between one plane portion along the edge and the other plane portion out of the flat portions that form the edge of the cutting tool, it is possible to perform accurate inspection at least when the cutting tool is manufactured.
- FIG. 1 is a diagram illustrating a trocar as a cutting tool according to an embodiment.
- FIG. 2 is a photographic image of the trocar illustrated in FIG. 1 .
- FIG. 3 is a photographic image illustrating sampling positions when material components of a trocar are quantitatively analyzed.
- FIG. 4 is a photographic image illustrating sampling positions when material components of a trocar as a comparative example are quantitatively analyzed.
- a sharp edge for incising a biological tissue is configured by causing two planes to intersect each other.
- a color of one plane portion along the edge is different from that of the other plane portion.
- This color difference corresponds to a thickness difference of an oxide film, which is caused by reducing a processing time in an electrolytic polishing process or a chemical polishing process (electrolytic polishing or the like) performed during a cutting tool manufacturing procedure.
- burrs attached to the edge are large in the case of a medical cutting tool manufactured in the related art, it is necessary to perform an electrolytic polishing or the like for a long time in order to remove the burrs from the edge.
- electrolytic polishing or the like due to the long-time electrolytic polishing or the like, elution also occurs in a portion along the edge when the burrs attached to the edge are removed. As a result, fine roundness is generated at a pointed end of the edge, so that sharpness of the edge disappears.
- the burrs attached to the edge are removed by using short-time electrolytic polishing or the like, so that a sharp edge can be implemented.
- a thickness difference of an oxide film occurs between one plane portion along the edge and the other plane portion, and a color difference occurs due to the thickness difference of the oxide film.
- the cutting tool according to the present invention can be recognized by the color difference between one plane portion along the edge and the other plane portion or by quantitatively analyzing the material components.
- the cutting tool according to the present invention it is possible to sufficiently reduce the impalement resistance in comparison with that of the cutting tool typically used in the related art.
- a metal represented by a carbon steel or a martensitic stainless steel which can be expected to be hardened through thermal treatment or an austenitic stainless steel which cannot be expected to be hardened through thermal treatment can be selectively used.
- the cutting tool according to the present invention be configured by performing a shaping process and a hardening process for a desired cutting tool through processes optimized to the selected material.
- the trocar A illustrated in FIGS. 1 and 2 is a cutting tool for piercing an eyeball and cutting a cornea or sclera in an ophthalmic surgical operation.
- SUS302 that is an austenitic stainless steel is employed as a material of the trocar A.
- the trocar A is formed in a round bar shape having a fiber-like extending structure by performing a cold drawing process on an element wire with a predetermined area reduction rate and having a high strength through a fabrication and hardening process.
- the trocar A is configured in a straight needle shape by performing a press process and then performing a grinding process on an end portion of the round-bar-shaped material fabricated as described above or by directly performing the grinding process on the end portion.
- the cutting tool according to the present invention in addition to the trocar A according to the present embodiment, there are an edged suture needle, a knife, and the like having a cutting functionality and any of them may be formed in the configuration of the trocar A described below.
- the trocar A includes a pair of sharp edges 1 formed by causing two plane portions 2 including a plane portion 2 illustrated in FIG. 1 and a plane portion (not illustrated) on the rear side of the paper of FIG. 1 to intersect each other.
- a cross section (a transverse cross section of a portion where the edge 1 of the trocar A exists) of a portion corresponding to the edge 1 is formed in a rhombus shape.
- the pair of edges 1 are formed on the two sides in the width direction (in the arrow direction X in FIG. 1 ), and the pair of ridges 3 having no incising function are formed on the two sides in the thickness direction (direction perpendicular to the paper plane of FIG. 1 ) perpendicular to the width direction.
- the rear surface side of the trocar A illustrated in FIG. 1 has the same shape as that illustrated in FIG. 1 .
- the edge 1 and the plane portion 2 are formed to converge toward a sharp tip 4 .
- the edge 1 and the plane portion 2 are inclined by using the sharp tip 4 as a starting point. Therefore, the pair of edges 1 , the pair of ridges 3 , and the plane portions 2 that forms the edges 1 and the ridges 3 are separated from each other according to the respective inclination and are connected to the body portion 5 .
- the body portion 5 is formed in a round bar shape having a predetermined diameter, so that the trocar A is formed in a straight needle shape.
- a boundary 6 is formed between the plane portion 2 and the body portion 5 .
- the boundary 6 forms an edge having an obtuse angle by causing the plane portion 2 and the outer circumferential surface of the body portion 5 to intersect each other.
- a small plane portion 7 is formed on the sharp tip 4 sides of the two plane portions 2 formed on one side in the thickness direction.
- the sharp tip 4 is configured from three planes including the two plane portions 2 and the small plane portion 7 . Therefore, the sharp tip 4 is formed necessarily as one point, so that it is possible to improve positioning accuracy at the first time of impalement of a tissue and reduce the impalement resistance.
- a part of the plane portions 2 along the edge 1 that is, a plane portion 2 a (one plane portion 2 a ) formed between the dashed-dotted line 10 and the edge 1 illustrated in FIGS. 1 and 2 has a color different from that of the other plane portion 2 b .
- the dashed-dotted line 10 indicates the boundary between the plane portion 2 a and the other plane portion 2 b for convenience purposes.
- the inventors of the present invention have examined the cause of the color difference, and it have been determined that the color difference is generated due to a thickness difference of an oxide film between the plane portions 2 a and 2 b .
- the oxide film in the plane portion 2 a is thin, the color is relatively close to a color of a metal material. Since the oxide film in the plane portion 2 b is thick, the color is close to gold.
- the plane portion 2 a has a dark color
- the plane portion 2 b has a white color. However, these color components are caused from illumination during the photographing.
- the plane portion 2 a having a different color is formed in a part of the plane portion 2 along the edge 1 , a portion along the boundary 6 , and a portion along the ridge 3 .
- the plane portion 2 a is formed over the substantially entire area in the vicinity of the plane 2 .
- the plane portion 2 a having a color different from that of the other plane portion 2 b is formed in a part of the plane portions 2 along the edge 1 , it is possible to sufficiently reduce the impalement resistance.
- the trocar A is formed as a rod-like material by cutting a round bar material, which is made of an austenitic stainless steel having a predetermined strength through a cold drawing process, by a desired length. Then, by performing a press process on the end portion on the one side of the material, the cross section is formed in a rhombus shape. The formed portion is ground to form a plane portion 2 , so that an edge 1 is formed in an intersection between the two plane portions 2 . Furthermore, a ridge 3 is formed by an intersection portion between the two plane portions 2 or by a press-processed surface, and a boundary 6 is formed in an intersection between one plane portion 2 and the outer circumferential surface of the body portion 5 .
- burrs are inevitably attached to the edge 1 , the ridge 3 , and the boundary 6 between the plane portion 2 and the body portion 5 . Therefore, by reducing at least the burrs attached to the edge 1 , it is possible to remove the burrs through a short-time electrolytic polishing process or the like. In this manner, in order to reduce the attached burrs, a processing rate during the grinding process is reduced.
- the reduction of the processing rate can be implemented by decreasing a load to the material during the grinding process. For example, if a processing rate at the time of grinding is set to about 1/10 of the processing rate at the time of grinding of the trocar in the related art, the burrs attached to the edge 1 can be sufficiently reduced.
- the processing rate is not limited to a specific value, but it may be appropriately set depending on a target cutting tool.
- the burrs attached to the edge 1 are reduced by reducing the processing rate at the time of grinding, the burrs can be removed within a short time by performing a polishing process such as an electrolytic polishing. As a result, it is possible to reduce a processing time of the electrolytic polishing or the like. As the processing time of the electrolytic polishing or the like is reduced, the polishing is not uniformly performed on the plane portion 2 , but irregularity occurs in the polishing process. In other words, a difference is generated in a degree of polishing between the plane portion 2 a along the edge 1 and the other plane portion 2 b.
- the partial difference in a degree of polishing in the plane portion 2 is caused from a thickness difference in an oxide film, a difference in a material component, and a difference in surface roughness.
- the electrolytic polishing or the like progresses at a high speed, so that the elution amount of iron increases and the chromium content increases. Therefore, the oxide film thereof becomes thin, and the surface roughness is reduced.
- the electrolytic polishing or the like is performed at a low speed in comparison with the plane portion 2 a , so that the elution amount of iron decreases and the chromium content decreases. Therefore, the oxide film thereof becomes thick, and the surface roughness increases.
- the color of plane portion 2 a along the edge 1 is different from that of the other plane portion 2 b due to a thickness difference of an oxide film, so that the chromium content of the plane portion 2 a is larger than the chromium content of the plane portion 2 b.
- FIG. 3 is a diagram illustrating the trocar A according to the present embodiment and sampling positions for quantitative analysis of metal components.
- FIG. 4 is a diagram illustrating the trocar according to the comparative example and sampling positions for quantitative analysis of metal components. Spectra 1 to 5 are arranged on the flat portion along the edge, and spectra 6 to 10 are arranged on the other plane portion.
- an electrolytic polishing process was performed for the material subjected to the planar grinding.
- the electrolytic polishing was performed such that the entire length of the plane portion 2 was immersed for about 35 seconds, and then, the length portion corresponding to the edge 1 was immersed for about 5 seconds. Through the electrolytic polishing process, all the burrs attached to the edge 1 were removed. After the electrolytic polishing was completed, the quantitative analysis using X-ray analysis was performed for the spectra 1 to 10 .
- the chromium content was 31.38%; the iron content was 60.08%; and the nickel content was 8.64%.
- the chromium content was 31.45%; the iron content was 59.36%; and the nickel content was 9.19%.
- the chromium content was 31.75%; the iron content was 60.10%; and the nickel content was 8.15%.
- the chromium content was 29.10%; the iron content was 61.33%; and the nickel content was 9.57%.
- the chromium content was 28.035%; the iron content was 63.41%; and the nickel content was 8.56%.
- the chromium content was 26.55%; the iron content was 63.57%; and the nickel content was 9.88%.
- the chromium content was 26.47%; the iron content was 63.17%; and the nickel content was 10.36%.
- the chromium content was 28.49%; the iron content was 61.47%; and the nickel content was 10.04%.
- the chromium content was 27.40%; the iron content was 62.32%; and the nickel content was 10.28%.
- the chromium content was 25.07%; the iron content was 65.16%; and the nickel content was 9.77%.
- the chromium content of the plane portion 2 a along the edge 1 is larger that that of the other plane portion 2 b (the spectra 6 to 10 ).
- the spectra 1 to 3 since the thin edge 1 is formed only by the two plane portions 2 , the elution amount of iron increases, so that the chromium content increases (31.38%, 31.45%, and 31.75%).
- the spectra 4 and 5 since the four plane portions approach each other, the relatively thick edge 1 is formed, so that the elution amount of iron is reduced and the chromium content is reduced (29.10% and 28.035%).
- the chromium content (31.38%) of the spectrum 1 as a portion where the thin edge 1 is formed only along the two plane portions 2 and the chromium content (26.55%, 26.47%, 28.49%, 27.40%, and 25.07%) of the spectra 6 to 10 were compared. As a result, there were differences of 4.83%, 4.91%, 2.89%, 3.98%, and 6.31%, respectively.
- the chromium content of the portion (positions of the spectra 1 to 3 , particularly, the width range within 40 ⁇ m in the vertical direction of the edge 1 ) where the thin edge 1 is formed only along the two plane portions 2 out of the plane portion 2 a is larger than the chromium content of the pointed end portion (positions of the spectra 4 and 5 ) where the four plane portions approach each other.
- the chromium content of the portion (positions of the spectra 1 to 3 ) is obviously larger than the chromium content of plane portion 2 b (particularly, the portion separated by 100 ⁇ m or longer in the vertical direction of the edge 1 ).
- the electrolytic polishing process was performed by immersing the entire length of the plane portion for about 50 seconds with an electric current density higher than that of the aforementioned embodiment. Through this electrolytic polishing process, overall burrs attached to the edge were removed. After the electrolytic polishing was completed, the quantitative analysis was performed as in the embodiment.
- the chromium content was 27.70%; the iron content was 62.28%; and the nickel content was 9.02%.
- the chromium content was 27.55%; the iron content was 62.47%; and the nickel content was 8.98%.
- the chromium content was 26.55%; the iron content was 63.13%; and the nickel content was 9.32%.
- the chromium content was 25.86%; the iron content was 62.95%; and the nickel content was 10.19%.
- the chromium content was 25.22%; the iron content was 65.32%; and the nickel content was 9.46%.
- the chromium content was 25.87%; the iron content was 64.42%; and the nickel content was 9.71%.
- the chromium content was 25.12%; the iron content was 65.00%; and the nickel content was 9.88%.
- the chromium content was 25.79%; the iron content was 64.53%; and the nickel content was 9.68%.
- the chromium content was 24.99%; the iron content was 65.16%; and the nickel content was 9.85%.
- the chromium content was 26.26%; the iron content was 63.89%; and the nickel content was 9.85%.
- the electrolytic treatment time was sufficiently long, and the electrolytic polishing was performed uniformly over the entire area of the plane portion. Therefore, the elution amount of iron was also substantially uniform, and the chromium content was also substantially uniform.
- the chromium content of the portions positions of the spectra 4 , 5 and the like in the comparative example
- the chromium content of the pointed end portions positions of the spectra 1 , 2 and the like in the comparative example
- the portions where a thin edge was formed only along the two plane portions tended to be slightly small.
- the surface roughness of the plane portion 2 a along the edge 1 and the surface roughness of the other plane portion 2 b were measured.
- the average surface roughness of the plane portion 2 a was Ra 2.38
- the average surface roughness of the plane portion 2 b was Ra 3.15. It can be said that this difference is a significant difference in a medial cutting tool.
- the average impalement resistance was 96.6 mili-newton (mN)
- the maximum value of impalement resistance was 107.0 mN
- the minimum value of impalement resistance was 78.0 mN.
- the average value of impalement resistance was 139.4 mN
- the maximum value of impalement resistance was 158.3 mN
- the minimum value of impalement resistance was 118.3 mN.
- the impalement performance of the trocar A according to the present embodiment is sufficiently improved in comparison with the impalement performance of the trocar in the related art or the trocar according to the comparative example.
- the present invention can be usefully applied to a thinned knife, a trocar, or an edged suture needle used in an ophthalmic surgical operation or a neurosurgical operation.
Abstract
[Problem] To provide a medical cutting tool with low impalement resistance. [Solution] The edged medical cutting tool comprising a knife, trocar or cutting suture needle has a sharp edge (1) for incising living tissue and a flat part (2) that configures the edge, and the color of the portion of the flat part (2 a) along the edge (1) differs from the color of the rest of the flat part (2 b). The difference in color results from a difference in the thickness of an oxide film. Another edged medical cutting tool is configured of austenite stainless steel and has a sharp edge (1) for incising living tissue and a flat part (2) that configures the edge. The chrome content of the portion of the flat part (2 a) along the edge is higher than the chrome content of the rest of the flat part (2 b).
Description
- The present invention relates to a sharply-edged medical cutting tool for incising a biological tissue with an improved piercing property.
- At the time of an ophthalmic surgical operation, a knife or trocar is employed to pierce an eyeball or incise a cornea or sclera, and a suture needle for piercing or incising a muscle or a skin is employed to suture an affected area. A medical cutting tool such a knife, a trocar, or a suture needle includes a sharp tip, a sharp edge elongated from the sharp tip, a plane portion that forms the edge, and a body portion continuously elongated from the plane portion.
- The edge and the plane portion have cross sections having a polygonal shape such as a triangle, a rectangle, or a pentagon. The shape of the cross section is set according to a type of a desired medical cutting tool, that is, according to whether the medical cutting tool is a knife, a trocar, or a suture needle. In addition, regardless of the cross-sectional shape of the medical cutting tool, two edges are formed by using the sharp tip as a starting point (for example, see Patent Literature 1).
-
- Patent Literature 1: Japanese Patent Laid-Open No. 06-077313
- In the medical cutting tool having the aforementioned configuration, it is necessary to reduce impalement resistance generated during the incision of the affected area. For example, if the impalement resistance is large, a doctor may feel fatigued, and may not accurately perform a surgical operation. For this reason, a manufacturer of a medical cutting tool has an important issue to improve a medical cutting tool including a knife, a trocar, and a suture needle having reduced impalement resistance.
- The present invention provides an edged medical cutting tool having reduced impalement resistance.
- In order to address the aforementioned problem, the inventors have made many development experiments. As a result, the inventors have found a fact that the impalement resistance is reduced by providing a sharp edge. In addition, the inventors have recognized that the sharp edge can be implemented by performing an electrolytic polishing process or a chemical polishing process within a short time after a polishing process.
- The inventors have also recognized that a color of one plane portion along the edge is different from that of the other plane portion when the sharp edge is configured by performing an electrolytic polishing process or a chemical polishing process and the polishing process is performed within a short time. Furthermore, the inventors have also recognized that the chromium content of one plane portion along the edge is different from that of the other plane portion when a stainless steel is employed as a material.
- According to an aspect of the present invention, there is provided a medical cutting tool including: a sharp edge for incising a biological tissue; and plane portions that form the edge, wherein a color of one plane portion along the edge is different from that of the other plane portion.
- In the edged medical cutting tool described above, a color difference between one plane portion along the edge and the other plane portion is based on a thickness difference of an oxide film.
- According to another aspect of the present invention, there is provided an edged medical cutting tool made of an austenitic stainless steel, including: a sharp edge for incising a biological tissue; and plane portions that form the edge, wherein a chromium content of one plane portion along the edge is larger than a chromium content of the other plane portion.
- In the edged medical cutting tool (hereinafter, simply referred to as a cutting tool) according to the present invention, it is possible to reduce impalement resistance by forming a sharp edge. Therefore, during an ophthalmic surgical operation or a general surgical operation, it is possible to alleviate fatigue of a doctor and accurately perform the incision.
- Particularly, since the formation of the sharp edge can be recognized by checking a color difference between one plane portion along the edge and the other plane portion out of the flat portions that form the edge of the cutting tool, it is possible to perform accurate inspection at least when the cutting tool is manufactured.
- In addition, in another cutting tool according to the present invention, by comparing the chromium content of one plane portion along the edge with the chromium content of the other plane portion, it is possible to check whether or not the sharp edge is formed.
-
FIG. 1 is a diagram illustrating a trocar as a cutting tool according to an embodiment. -
FIG. 2 is a photographic image of the trocar illustrated inFIG. 1 . -
FIG. 3 is a photographic image illustrating sampling positions when material components of a trocar are quantitatively analyzed. -
FIG. 4 is a photographic image illustrating sampling positions when material components of a trocar as a comparative example are quantitatively analyzed. -
-
- A: TROCAR
- 1: EDGE
- 2, 2 a, 2 b: PLANE PORTION
- 3: RIDGE
- 4: SHARP TIP
- 5: BODY PORTION
- 6: BOUNDARY
- 7: SMALL PLANE PORTION
- 10: DASHED-DOTTED LINE (boundary between the
plane portion 2 a and theother plane portion 2 b)
- Hereinafter, a cutting tool according to the present invention will be described. According to the present invention, when a biological tissue is pierced and incised during a surgical operation using a knife, a trocar, an edged suture needle, and the like, impalement resistance is reduced, so that it is possible to alleviate fatigue of a doctor and accurately perform the surgical operation.
- According to the present invention, a sharp edge for incising a biological tissue is configured by causing two planes to intersect each other. In addition, a color of one plane portion along the edge is different from that of the other plane portion. This color difference corresponds to a thickness difference of an oxide film, which is caused by reducing a processing time in an electrolytic polishing process or a chemical polishing process (electrolytic polishing or the like) performed during a cutting tool manufacturing procedure.
- In other words, since burrs attached to the edge are large in the case of a medical cutting tool manufactured in the related art, it is necessary to perform an electrolytic polishing or the like for a long time in order to remove the burrs from the edge. In addition, due to the long-time electrolytic polishing or the like, elution also occurs in a portion along the edge when the burrs attached to the edge are removed. As a result, fine roundness is generated at a pointed end of the edge, so that sharpness of the edge disappears.
- On the contrary, in a procedure of manufacturing a cutting tool according to the present invention, the burrs attached to the edge are removed by using short-time electrolytic polishing or the like, so that a sharp edge can be implemented. In addition, as a result of the short-time electrolytic polishing or the like, a thickness difference of an oxide film occurs between one plane portion along the edge and the other plane portion, and a color difference occurs due to the thickness difference of the oxide film.
- In the cutting tool where a color difference occurs between one plane portion along the edge and the other plane portion as described above, a change in material component also occurs in addition to the color difference.
- Therefore, the cutting tool according to the present invention can be recognized by the color difference between one plane portion along the edge and the other plane portion or by quantitatively analyzing the material components.
- Furthermore, in the cutting tool according to the present invention, it is possible to sufficiently reduce the impalement resistance in comparison with that of the cutting tool typically used in the related art.
- As a material for the cutting tool according to the present invention, a metal represented by a carbon steel or a martensitic stainless steel which can be expected to be hardened through thermal treatment or an austenitic stainless steel which cannot be expected to be hardened through thermal treatment can be selectively used. In addition, it is preferable that the cutting tool according to the present invention be configured by performing a shaping process and a hardening process for a desired cutting tool through processes optimized to the selected material.
- Next, a trocar A according to the present embodiment will be described with reference to
FIGS. 1 and 2 . The trocar A illustrated inFIGS. 1 and 2 is a cutting tool for piercing an eyeball and cutting a cornea or sclera in an ophthalmic surgical operation. As a material of the trocar A, SUS302 that is an austenitic stainless steel is employed. The trocar A is formed in a round bar shape having a fiber-like extending structure by performing a cold drawing process on an element wire with a predetermined area reduction rate and having a high strength through a fabrication and hardening process. - In addition, the trocar A is configured in a straight needle shape by performing a press process and then performing a grinding process on an end portion of the round-bar-shaped material fabricated as described above or by directly performing the grinding process on the end portion. Incidentally, as the cutting tool according to the present invention, in addition to the trocar A according to the present embodiment, there are an edged suture needle, a knife, and the like having a cutting functionality and any of them may be formed in the configuration of the trocar A described below.
- In
FIGS. 1 and 2 , the trocar A includes a pair ofsharp edges 1 formed by causing twoplane portions 2 including aplane portion 2 illustrated inFIG. 1 and a plane portion (not illustrated) on the rear side of the paper ofFIG. 1 to intersect each other. Particularly, in the trocar A according to the embodiment, a cross section (a transverse cross section of a portion where theedge 1 of the trocar A exists) of a portion corresponding to theedge 1 is formed in a rhombus shape. The pair ofedges 1 are formed on the two sides in the width direction (in the arrow direction X inFIG. 1 ), and the pair ofridges 3 having no incising function are formed on the two sides in the thickness direction (direction perpendicular to the paper plane ofFIG. 1 ) perpendicular to the width direction. In addition, the rear surface side of the trocar A illustrated inFIG. 1 has the same shape as that illustrated inFIG. 1 . - The
edge 1 and theplane portion 2 are formed to converge toward asharp tip 4. In other words, theedge 1 and theplane portion 2 are inclined by using thesharp tip 4 as a starting point. Therefore, the pair ofedges 1, the pair ofridges 3, and theplane portions 2 that forms theedges 1 and theridges 3 are separated from each other according to the respective inclination and are connected to thebody portion 5. Thebody portion 5 is formed in a round bar shape having a predetermined diameter, so that the trocar A is formed in a straight needle shape. - In the trocar A having the aforementioned configuration, as the
plane portion 2 that forms theedge 1 is separated from theedge 1 and is connected to thebody portion 5, aboundary 6 is formed between theplane portion 2 and thebody portion 5. Theboundary 6 forms an edge having an obtuse angle by causing theplane portion 2 and the outer circumferential surface of thebody portion 5 to intersect each other. - In addition, in the trocar A according to the present embodiment, a
small plane portion 7 is formed on thesharp tip 4 sides of the twoplane portions 2 formed on one side in the thickness direction. By forming thesmall plane portion 7, thesharp tip 4 is configured from three planes including the twoplane portions 2 and thesmall plane portion 7. Therefore, thesharp tip 4 is formed necessarily as one point, so that it is possible to improve positioning accuracy at the first time of impalement of a tissue and reduce the impalement resistance. - As illustrated in
FIG. 2 , a part of theplane portions 2 along theedge 1, that is, aplane portion 2 a (oneplane portion 2 a) formed between the dashed-dottedline 10 and theedge 1 illustrated inFIGS. 1 and 2 has a color different from that of theother plane portion 2 b. However, since it is difficult to clearly represent the color difference between theplane portions line 10 indicates the boundary between theplane portion 2 a and theother plane portion 2 b for convenience purposes. - The inventors of the present invention have examined the cause of the color difference, and it have been determined that the color difference is generated due to a thickness difference of an oxide film between the
plane portions plane portion 2 a is thin, the color is relatively close to a color of a metal material. Since the oxide film in theplane portion 2 b is thick, the color is close to gold. Incidentally, in the photographic image ofFIG. 2 , theplane portion 2 a has a dark color, and theplane portion 2 b has a white color. However, these color components are caused from illumination during the photographing. - As illustrated in
FIG. 2 , theplane portion 2 a having a different color is formed in a part of theplane portion 2 along theedge 1, a portion along theboundary 6, and a portion along theridge 3. In other words, theplane portion 2 a is formed over the substantially entire area in the vicinity of theplane 2. However, in the case of the cutting tool, if theplane portion 2 a having a color different from that of theother plane portion 2 b is formed in a part of theplane portions 2 along theedge 1, it is possible to sufficiently reduce the impalement resistance. - Next, a procedure of manufacturing a trocar A capable of removing burrs attached to the
edge 1 by using a short-time electrolytic polishing or the like will be described in brief. - As described above, the trocar A is formed as a rod-like material by cutting a round bar material, which is made of an austenitic stainless steel having a predetermined strength through a cold drawing process, by a desired length. Then, by performing a press process on the end portion on the one side of the material, the cross section is formed in a rhombus shape. The formed portion is ground to form a
plane portion 2, so that anedge 1 is formed in an intersection between the twoplane portions 2. Furthermore, aridge 3 is formed by an intersection portion between the twoplane portions 2 or by a press-processed surface, and aboundary 6 is formed in an intersection between oneplane portion 2 and the outer circumferential surface of thebody portion 5. - Similarly to the aforementioned case, when the material is ground, burrs are inevitably attached to the
edge 1, theridge 3, and theboundary 6 between theplane portion 2 and thebody portion 5. Therefore, by reducing at least the burrs attached to theedge 1, it is possible to remove the burrs through a short-time electrolytic polishing process or the like. In this manner, in order to reduce the attached burrs, a processing rate during the grinding process is reduced. - The reduction of the processing rate can be implemented by decreasing a load to the material during the grinding process. For example, if a processing rate at the time of grinding is set to about 1/10 of the processing rate at the time of grinding of the trocar in the related art, the burrs attached to the
edge 1 can be sufficiently reduced. However, the processing rate is not limited to a specific value, but it may be appropriately set depending on a target cutting tool. - When the burrs attached to the
edge 1 are reduced by reducing the processing rate at the time of grinding, the burrs can be removed within a short time by performing a polishing process such as an electrolytic polishing. As a result, it is possible to reduce a processing time of the electrolytic polishing or the like. As the processing time of the electrolytic polishing or the like is reduced, the polishing is not uniformly performed on theplane portion 2, but irregularity occurs in the polishing process. In other words, a difference is generated in a degree of polishing between theplane portion 2 a along theedge 1 and theother plane portion 2 b. - The partial difference in a degree of polishing in the
plane portion 2 is caused from a thickness difference in an oxide film, a difference in a material component, and a difference in surface roughness. In other words, since the material is thin in theplane portion 2 a along theedge 1, the electrolytic polishing or the like progresses at a high speed, so that the elution amount of iron increases and the chromium content increases. Therefore, the oxide film thereof becomes thin, and the surface roughness is reduced. On the contrary, in theother plane portion 2 b, since the material is thick in comparison with theplane portion 2 a, the electrolytic polishing or the like is performed at a low speed in comparison with theplane portion 2 a, so that the elution amount of iron decreases and the chromium content decreases. Therefore, the oxide film thereof becomes thick, and the surface roughness increases. - In this manner, the color of
plane portion 2 a along theedge 1 is different from that of theother plane portion 2 b due to a thickness difference of an oxide film, so that the chromium content of theplane portion 2 a is larger than the chromium content of theplane portion 2 b. - Next, the description will be made for a result of the comparison between the trocar A according to the present embodiment and the trocar in the related art (comparative example).
FIG. 3 is a diagram illustrating the trocar A according to the present embodiment and sampling positions for quantitative analysis of metal components.FIG. 4 is a diagram illustrating the trocar according to the comparative example and sampling positions for quantitative analysis of metal components.Spectra 1 to 5 are arranged on the flat portion along the edge, andspectra 6 to 10 are arranged on the other plane portion. - According to the present embodiment, an electrolytic polishing process was performed for the material subjected to the planar grinding. The electrolytic polishing was performed such that the entire length of the
plane portion 2 was immersed for about 35 seconds, and then, the length portion corresponding to theedge 1 was immersed for about 5 seconds. Through the electrolytic polishing process, all the burrs attached to theedge 1 were removed. After the electrolytic polishing was completed, the quantitative analysis using X-ray analysis was performed for thespectra 1 to 10. - As a result, in the
spectrum 1, the chromium content was 31.38%; the iron content was 60.08%; and the nickel content was 8.64%. In addition, in thespectrum 2, the chromium content was 31.45%; the iron content was 59.36%; and the nickel content was 9.19%. In addition, in thespectrum 3, the chromium content was 31.75%; the iron content was 60.10%; and the nickel content was 8.15%. In addition, in thespectrum 4, the chromium content was 29.10%; the iron content was 61.33%; and the nickel content was 9.57%. In addition, in thespectrum 5, the chromium content was 28.035%; the iron content was 63.41%; and the nickel content was 8.56%. - In the
spectrum 6, the chromium content was 26.55%; the iron content was 63.57%; and the nickel content was 9.88%. In addition, in thespectrum 7, the chromium content was 26.47%; the iron content was 63.17%; and the nickel content was 10.36%. In addition, in the spectrum 8, the chromium content was 28.49%; the iron content was 61.47%; and the nickel content was 10.04%. In addition, in thespectrum 9, the chromium content was 27.40%; the iron content was 62.32%; and the nickel content was 10.28%. In addition, in thespectrum 10, the chromium content was 25.07%; the iron content was 65.16%; and the nickel content was 9.77%. - From the result described above, it can be said that the chromium content of the
plane portion 2 a along theedge 1 is larger that that of theother plane portion 2 b (thespectra 6 to 10). Particularly, it is conceived that, in thespectra 1 to 3, since thethin edge 1 is formed only by the twoplane portions 2, the elution amount of iron increases, so that the chromium content increases (31.38%, 31.45%, and 31.75%). It is conceived that, in thespectra thick edge 1 is formed, so that the elution amount of iron is reduced and the chromium content is reduced (29.10% and 28.035%). - Here, out of the
plane portion 2 a, the chromium content (31.38%) of thespectrum 1 as a portion where thethin edge 1 is formed only along the twoplane portions 2 and the chromium content (26.55%, 26.47%, 28.49%, 27.40%, and 25.07%) of thespectra 6 to 10 were compared. As a result, there were differences of 4.83%, 4.91%, 2.89%, 3.98%, and 6.31%, respectively. - In summary, it can be concluded that the chromium content of the portion (positions of the
spectra 1 to 3, particularly, the width range within 40 μm in the vertical direction of the edge 1) where thethin edge 1 is formed only along the twoplane portions 2 out of theplane portion 2 a is larger than the chromium content of the pointed end portion (positions of thespectra 4 and 5) where the four plane portions approach each other. In addition, it can be concluded that the chromium content of the portion (positions of thespectra 1 to 3) is obviously larger than the chromium content ofplane portion 2 b (particularly, the portion separated by 100 μm or longer in the vertical direction of the edge 1). - Next, in the comparative example, the electrolytic polishing process was performed by immersing the entire length of the plane portion for about 50 seconds with an electric current density higher than that of the aforementioned embodiment. Through this electrolytic polishing process, overall burrs attached to the edge were removed. After the electrolytic polishing was completed, the quantitative analysis was performed as in the embodiment.
- As a result, in the
spectrum 1, the chromium content was 27.70%; the iron content was 62.28%; and the nickel content was 9.02%. In addition, in thespectrum 2, the chromium content was 27.55%; the iron content was 62.47%; and the nickel content was 8.98%. In addition, in thespectrum 3, the chromium content was 26.55%; the iron content was 63.13%; and the nickel content was 9.32%. In addition, in thespectrum 4, the chromium content was 25.86%; the iron content was 62.95%; and the nickel content was 10.19%. In addition, in thespectrum 5, the chromium content was 25.22%; the iron content was 65.32%; and the nickel content was 9.46%. - In addition, in the
spectrum 6, the chromium content was 25.87%; the iron content was 64.42%; and the nickel content was 9.71%. In addition, in thespectrum 7, the chromium content was 25.12%; the iron content was 65.00%; and the nickel content was 9.88%. In addition, in the spectrum 8, the chromium content was 25.79%; the iron content was 64.53%; and the nickel content was 9.68%. In addition, in thespectrum 9, the chromium content was 24.99%; the iron content was 65.16%; and the nickel content was 9.85%. In addition, in thespectrum 10, the chromium content was 26.26%; the iron content was 63.89%; and the nickel content was 9.85%. - In the comparative example described above, the electrolytic treatment time was sufficiently long, and the electrolytic polishing was performed uniformly over the entire area of the plane portion. Therefore, the elution amount of iron was also substantially uniform, and the chromium content was also substantially uniform.
- In addition, in the plane portion along the edge in the comparative example, the chromium content of the portions (positions of the
spectra spectra - In the trocar A according to the present embodiment, the surface roughness of the
plane portion 2 a along theedge 1 and the surface roughness of theother plane portion 2 b were measured. As a result, the average surface roughness of theplane portion 2 a was Ra 2.38, and the average surface roughness of theplane portion 2 b was Ra 3.15. It can be said that this difference is a significant difference in a medial cutting tool. - Next, an experiment of comparing impalement resistance between the trocar A according to the embodiment and the trocar (
FIG. 4 ) according to the comparative example was performed. In this experiment, similar to a typical impalement experiment for a knife, a trocar, or a suture needle, a force for piercing a Porvair having a thickness of 0.45 mm was measured. Five samples of the trocar A and five samples of the trocar according to the comparative example were prepared. For each sample, the Porvair was pierced three times, and the average piercing force was obtained. In addition, the average value of overall piercing forces (that is, piercing of 15 times) was obtained, and comparison thereof was performed. - As a result, for the trocar A according to the present embodiment, the average impalement resistance was 96.6 mili-newton (mN), the maximum value of impalement resistance was 107.0 mN, and the minimum value of impalement resistance was 78.0 mN. On the contrary, for the trocar according to the comparative example, the average value of impalement resistance was 139.4 mN, the maximum value of impalement resistance was 158.3 mN, and the minimum value of impalement resistance was 118.3 mN.
- In this manner, it can be said that the impalement performance of the trocar A according to the present embodiment is sufficiently improved in comparison with the impalement performance of the trocar in the related art or the trocar according to the comparative example.
- The present invention can be usefully applied to a thinned knife, a trocar, or an edged suture needle used in an ophthalmic surgical operation or a neurosurgical operation.
Claims (3)
1. A medical cutting tool comprising:
a sharp edge for incising a biological tissue; and
plane portions that form the edge,
wherein a color of one plane portion along the edge is different from that of the other plane portion.
2. The medical cutting tool according to claim 1 , wherein a color difference between one plane portion along the edge and the other plane portion is based on a thickness difference of an oxide film.
3. An edged medical cutting tool made of an austenitic stainless steel, comprising:
a sharp edge for incising a biological tissue; and
plane portions that form the edge,
wherein a chromium content of one plane portion along the edge is larger than a chromium content of the other plane portion.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-217040 | 2010-09-28 | ||
JP2010217040 | 2010-09-28 | ||
PCT/JP2011/071832 WO2012043447A1 (en) | 2010-09-28 | 2011-09-26 | Edged medical cutting tool |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/071832 A-371-Of-International WO2012043447A1 (en) | 2010-09-28 | 2011-09-26 | Edged medical cutting tool |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/940,318 Continuation US10245060B2 (en) | 2010-09-28 | 2015-11-13 | Edged medical cutting tool |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130197549A1 true US20130197549A1 (en) | 2013-08-01 |
Family
ID=45892893
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/876,739 Abandoned US20130197549A1 (en) | 2010-09-28 | 2011-09-26 | Edged medical cutting tool |
US14/940,318 Active 2033-05-04 US10245060B2 (en) | 2010-09-28 | 2015-11-13 | Edged medical cutting tool |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/940,318 Active 2033-05-04 US10245060B2 (en) | 2010-09-28 | 2015-11-13 | Edged medical cutting tool |
Country Status (4)
Country | Link |
---|---|
US (2) | US20130197549A1 (en) |
EP (1) | EP2623054A4 (en) |
JP (1) | JP5877158B2 (en) |
WO (1) | WO2012043447A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10543059B2 (en) * | 2010-07-03 | 2020-01-28 | Mani, Inc. | Method of producing a medical cutting tool |
US20200268437A1 (en) * | 2017-10-09 | 2020-08-27 | Stryker European Operations Limited | An Electrode for an Electrosurgical Pencil and a Method of Making an Electrode |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6423203B2 (en) * | 2014-08-29 | 2018-11-14 | マニー株式会社 | Medical suture needle |
KR101994306B1 (en) * | 2017-12-19 | 2019-06-28 | 황세정 | Medical needle |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5202013A (en) * | 1991-10-15 | 1993-04-13 | Alcan International Limited | Process for coloring metal surfaces |
US5224950A (en) * | 1991-10-02 | 1993-07-06 | Prywes Arnold S | Color calibrated multi-function scalpel blade for intraocular and other surgery and associated methods of use |
US5958519A (en) * | 1997-09-15 | 1999-09-28 | National Science Council | Method for forming oxide film on III-V substrate |
US6330750B1 (en) * | 1996-01-11 | 2001-12-18 | Molecular Metallurgy, Inc. | Scapel blade having high sharpness and toughness |
US20070179515A1 (en) * | 2005-09-30 | 2007-08-02 | Kanji Matsutani | Medical knife |
US20090048537A1 (en) * | 2006-01-31 | 2009-02-19 | Angiotech Biocoatings Corp. | Lubricious coatings |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU503043B2 (en) * | 1974-10-22 | 1979-08-23 | Nippon Steel Corporation | Coloring a stainless steel |
DE3841443C1 (en) * | 1988-12-09 | 1990-01-04 | Singer Spezialnadelfabrik Gmbh, 5102 Wuerselen, De | Surgical needle |
US5263974A (en) * | 1991-01-09 | 1993-11-23 | Matsutani Seisakusho Co., Ltd. | Suture needle and method of and apparatus for grinding material for suture needle |
JP2684933B2 (en) | 1992-07-31 | 1997-12-03 | 信越化学工業株式会社 | Crosslinkable polysilane composition and polysilane crosslinked film thereof |
JP4269299B2 (en) * | 2000-02-29 | 2009-05-27 | マニー株式会社 | Medical knife |
JP2002345834A (en) * | 2001-05-25 | 2002-12-03 | Manii Kk | Medical knives |
JP4143708B2 (en) * | 2003-06-25 | 2008-09-03 | マニー株式会社 | Medical knife |
JP4315080B2 (en) * | 2004-08-11 | 2009-08-19 | マニー株式会社 | Manufacturing method of medical knife |
JP4604140B2 (en) * | 2004-09-13 | 2010-12-22 | マニー株式会社 | Medical needle or blade |
-
2011
- 2011-09-26 WO PCT/JP2011/071832 patent/WO2012043447A1/en active Application Filing
- 2011-09-26 JP JP2012536429A patent/JP5877158B2/en active Active
- 2011-09-26 EP EP11829001.4A patent/EP2623054A4/en not_active Ceased
- 2011-09-26 US US13/876,739 patent/US20130197549A1/en not_active Abandoned
-
2015
- 2015-11-13 US US14/940,318 patent/US10245060B2/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5224950A (en) * | 1991-10-02 | 1993-07-06 | Prywes Arnold S | Color calibrated multi-function scalpel blade for intraocular and other surgery and associated methods of use |
US5202013A (en) * | 1991-10-15 | 1993-04-13 | Alcan International Limited | Process for coloring metal surfaces |
US6330750B1 (en) * | 1996-01-11 | 2001-12-18 | Molecular Metallurgy, Inc. | Scapel blade having high sharpness and toughness |
US5958519A (en) * | 1997-09-15 | 1999-09-28 | National Science Council | Method for forming oxide film on III-V substrate |
US20070179515A1 (en) * | 2005-09-30 | 2007-08-02 | Kanji Matsutani | Medical knife |
US20090048537A1 (en) * | 2006-01-31 | 2009-02-19 | Angiotech Biocoatings Corp. | Lubricious coatings |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10543059B2 (en) * | 2010-07-03 | 2020-01-28 | Mani, Inc. | Method of producing a medical cutting tool |
US20200268437A1 (en) * | 2017-10-09 | 2020-08-27 | Stryker European Operations Limited | An Electrode for an Electrosurgical Pencil and a Method of Making an Electrode |
Also Published As
Publication number | Publication date |
---|---|
WO2012043447A1 (en) | 2012-04-05 |
JPWO2012043447A1 (en) | 2014-02-06 |
US20160066941A1 (en) | 2016-03-10 |
US10245060B2 (en) | 2019-04-02 |
JP5877158B2 (en) | 2016-03-02 |
EP2623054A4 (en) | 2017-03-29 |
EP2623054A1 (en) | 2013-08-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10245060B2 (en) | Edged medical cutting tool | |
EP1769760B1 (en) | Medical knife | |
RU2467713C2 (en) | Medical suture needle | |
JP5566045B2 (en) | Medical suture needle | |
US20060030788A1 (en) | Apparatus and method for extracting bodily fluid utilizing a flat lancet | |
JPH03244445A (en) | Medical suture needle | |
US20130172917A1 (en) | Medical knife | |
JP4604140B2 (en) | Medical needle or blade | |
US9132036B2 (en) | Stripping knife | |
JP2002345834A (en) | Medical knives | |
US20160038143A1 (en) | Medical suture needle | |
US10575845B2 (en) | Suture needle | |
US10751046B2 (en) | Medical suture needle | |
CN105361915B (en) | Medical suture needle | |
JP6181135B2 (en) | Straight knife manufacturing method | |
US20100145375A1 (en) | Apparatus Useful for Rodent Tail Lateral Vessel Transection |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MANI, INC., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KATO, KAZUAKI;REEL/FRAME:030110/0320 Effective date: 20130308 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |