US20050149087A1 - Multiple-angle scissor blade - Google Patents

Multiple-angle scissor blade Download PDF

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Publication number
US20050149087A1
US20050149087A1 US10/976,505 US97650504A US2005149087A1 US 20050149087 A1 US20050149087 A1 US 20050149087A1 US 97650504 A US97650504 A US 97650504A US 2005149087 A1 US2005149087 A1 US 2005149087A1
Authority
US
United States
Prior art keywords
blades
tip portion
cutting
blade
pair
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
Application number
US10/976,505
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English (en)
Inventor
Russell Ahlberg
Gary Johnson
David Okihisa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Applied Medical Resources Corp
Original Assignee
Applied Medical Resources Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Applied Medical Resources Corp filed Critical Applied Medical Resources Corp
Priority to US10/976,505 priority Critical patent/US20050149087A1/en
Assigned to APPLIED MEDICAL RESOURCES CORPORATION reassignment APPLIED MEDICAL RESOURCES CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AHLBERG, RUSSELL E., JOHNSOPN, GARY M., OKIHISA, DAVID
Publication of US20050149087A1 publication Critical patent/US20050149087A1/en
Priority to US11/735,798 priority patent/US8114107B2/en
Priority to US12/552,262 priority patent/US8590428B2/en
Abandoned legal-status Critical Current

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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
    • A61B17/3201—Scissors
    • 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
    • A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/52—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of shear blades or scissors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B13/00—Hand shears; Scissors
    • B26B13/06—Hand shears; Scissors characterised by the shape of the blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B13/00—Hand shears; Scissors
    • B26B13/06—Hand shears; Scissors characterised by the shape of the blades
    • B26B13/08—Hand shears; Scissors characterised by the shape of the blades with cutting edges wavy or toothed in the plane of the blade

Definitions

  • This invention generally relates to laparoscopic scissors and, more particular, to laparoscopic scissors having multiple cutting angles and multiple thicknesses.
  • a goal in the design of scissors and, in particular, in the design of scissors' blades is to optimize its effectiveness in cutting through different objects.
  • a large angle ground into the blade is most effective. That is, when sharp edges shear against each other, any tissue which comes between the blades of the scissors will get cut.
  • the large angle on each blade is effective when cutting soft material because the blades can stay thin and razor sharp throughout the cut.
  • a thin and sharp edge is optimal for soft materials because there is less resistance throughout the cut.
  • the fine edge of a typical scissors' blade may not be as effective as when cutting soft tissue.
  • a very fine and sharp edge may deform when required to cut a hard object. That is, a blade having a very large angle ground into it will deform if used to cut hard objects.
  • the blades have to be designed to be thicker at and behind the point of cutting so that the blade edges do not deform. Having a small angle on the cutting edge of a scissor blade like this would help when cutting through hard materials such as staples or hard objects. Accordingly, because tissue and staples are typically cut with the same instrument, there is a need in the art for a laparoscopic scissors having both a large angle cutting edge and a small angle cutting edge on the same device.
  • the invention is directed to a pair of laparoscopic scissors, comprising a pair of blades connected at a pivot, each of the blades having a length, a tip portion, a body portion, an outer surface, an inner surface and a cutting edge, the cutting edge forming an angle with the outer surface along the length of the blade such that tension during a cutting operation at the tip portion is about the same as tension at the body portion during the cutting operation.
  • the angle formed is continuously changing over the length of the blade.
  • the angle at the tip portion is greater than at the body portion, and the angle progressively decreases from the tip portion to the body portion.
  • the tip portion may have a first body thickness and the body portion may have a second body thickness different from the first body thickness.
  • the blade may comprise a proximal portion proximal to the body portion having a third body thickness, wherein the second body thickness is thicker than the first and third body thicknesses.
  • the cutting operation may include cutting at least one of a body tissue, a suture and a surgical staple.
  • the blades progressively move over each other to provide a point contact along the cutting edges.
  • the blades may be thickened in a number of locations and combinations including: (1) one blade could be thicker than the other to force the opposing blade to flex; (2) both blades could be thicker at the body or throat sections to give more strength when cutting staples; (3) each blade could be thickened on one side or the other to stiffen certain locations; and (4) the tips of each blade could be thicker than the body or throat sections to provide increased tension at the tips.
  • a process of manufacturing the pair of scissors of the invention comprising the steps of form grinding the blades into a desired shape from a pre-hardened block of material, and sharpening the cutting edges of the blades.
  • the blades of the invention may also be formed through other processes including Wire EDM (Electrical Discharge Machining), laser cutting, waterjet cutting, machining, cast or metal injection molding, and other independent profile manufacturing process.
  • Wire EDM Electro Discharge Machining
  • laser cutting laser cutting
  • waterjet cutting waterjet cutting
  • machining machining
  • cast or metal injection molding cast or metal injection molding
  • FIG. 1 illustrates a multiple-angle scissor blade in accordance with a first embodiment of the invention where the angle is continuously changing;
  • FIG. 2 illustrates a multiple-angle scissor blade in accordance with another embodiment of the invention where an angle is held constant in each section of the blade;
  • FIG. 3 illustrates a side view of a blade having multiple thicknesses in accordance with another embodiment of the invention
  • FIG. 4 illustrates a profile of a blade formed from grinding in accordance with a manufacturing process of the invention
  • FIG. 5 illustrates a top view of a blade formed from another independent profile manufacturing process in accordance with an embodiment of the invention.
  • FIG. 6 shows pair of scissors and illustrating the cutting edges and throat portion in accordance with an embodiment of the invention.
  • the blade 10 includes a tip portion 12 , a body or throat portion 14 , an outer surface 16 , an inner surface 18 , a cutting edge 22 and a pivot area 20 .
  • the cutting edge 22 forms an angle with the outer surface 16 along the length of the blade 10 such that tension at the tip portion 12 is about the same as tension at the body or throat portion 14 .
  • the function and effectiveness of the scissor blades depend heavily on the tension and angle the cutting surfaces are to each other.
  • the blades are designed such that the tension when cutting is about the same throughout the length of the blades, e.g., at the tip and at the body or throat portion.
  • the conventional scissors have uniform blade thicknesses where tension at the tip is less than tension at the body portion because it is further away from the pivot. As a result, the conventional scissors blades may deform when cutting through harder and denser objects.
  • a novel feature of the invention is that an angle ⁇ formed between the cutting edge 22 and the outer surface 16 at the tip portion 12 is different from an angle ⁇ formed between the cutting edge 22 and the outer surface 16 at the body or throat portion 14 . That is, the angle formed between the cutting edge 22 and the outer surface 16 may be continuously changing over the length of the blade 10 . In one aspect, the angle ⁇ is greater than the angle ⁇ . With this aspect, the edge of the blade would start at a very large angle ⁇ at the tip portion 12 and as it proceeds back along the edge toward the back of the blade, the angle starts to reduce until it is much smaller at the body or throat portion 14 of the blade.
  • An advantage of the multiple-angle scissor blade 10 of the invention is the angles that most effectively cut different materials are all included on the same blade. Surgeons typically “snip” at tissue with the tip of the blades. Thus, grinding a large angle edge near the tip portion 12 of blade 10 would be most effective. Surgeons typically cut suture, which is a little harder than tissue, somewhere in the middle of the blades. Thus, grinding a smaller angle near the mid-portion of blade 10 would be optimal for suture. When cutting through very hard staples, surgeons will typically take a bite and force the staple somewhere between the center and the throat of the blades as illustrated in FIG. 6 . Thus, grinding a very small angle into the blade near the throat portion 14 would be optimal for cutting hard materials. Also, the most leverage is available at the throat section, making the cut easier.
  • the blades may be of any shape. In one aspect, the blades define a slight curve towards one another, which provides sharper cutting due to a single point cutting action.
  • the tip portion 12 may also be provided by an outer edge 26 .
  • the tapered tip portion 12 allows insertion of the scissor blades into a cavity in the body of a patient. Additionally, the tip is rounded at its outer edge 26 to avoid inadvertent puncturing or abrasion by the tip during use.
  • multiple sections of different angles may be grinded in the blade 10 b of the scissors.
  • the cutting edge 22 b of the blade 10 b may start out forming a very large angle ⁇ with the outer surface 16 b at the tip portion 12 b.
  • This angle ⁇ could be held constant for a given length.
  • the angle ⁇ could then transition into a smaller angle ⁇ , which then could be held constant for a next given length.
  • the angle ⁇ may be held constant over the tip portion 12 b and the angle ⁇ may be held constant over the throat portion 14 b with an angle transition portion 24 b formed between the tip portion 12 b and the throat portion 14 b as illustrated in FIG. 2 .
  • FIG. 3 there is shown a side view of a blade 30 having a tip portion 32 , a mid-portion 34 and proximal portion 36 .
  • the mid-portion 34 is thicker than the tip portion 32 and the proximal portion 36 . That is, when the blades slide over each other during a cutting stroke, the blades flex so that only one point is actually touching. This flexure and the tension between the blades can be controlled and “forced” to different areas by varying the thickness of the blades.
  • the tension of each blade can be controlled and the flexure can be forced into certain areas on the blade.
  • a thicker blade is also stronger in that section. When cutting through hard materials such as staples, a thicker, stronger blade is always beneficial.
  • the scissors blades can be thickened in a number of locations and combinations such as:
  • the scissors can be manufactured in a number of different ways.
  • the most common method is to stamp and form the blades from a predetermined thick material, and then grind a razor edge into them.
  • This method is relatively inexpensive, but if the blades need to be heat treated after forming, the parts can twist and distort thereby reducing or eliminating the tension between the blades. Thus, another process may be required to bring the parts back into specification so the proper blade tension may be realized.
  • a block of material that is heat treated to the required hardness can be manufactured prior to manufacturing the blades.
  • a form-grinding machine can grind one profile into the blade such as the cutting profile 40 illustrated in FIG. 4 .
  • Form grinding is the process of taking a diamond impregnated grinding stone that has a particular shape cut into it, and shaving away the pre-hardened material until a block has the desired profile.
  • the profile as shown in FIG. 4 is not limited to grinding and may be cut with Wire EDM (Electrical Discharge Machining).
  • Wire EDM is a metal removal technique using a controlled electrical current or spark erosion. The EDM machine moves a wire through the part eroding material away. With Wire EDM, there is always a gap between the part and the wire so there is no contact and virtually no deflecting force applied to the part, which ensures greater accuracy and tight tolerances of the finished part.
  • the parts can also be formed by machining, cast injection molding or metal injection molding. The molded or cast part or block can then be further processed by EDM, laser cutting, waterjet cutting, or other manufacturing process to produce the finished parts.
  • Waterjet cutting is a process of directing a fine, very high-pressure water stream to a material to cut or form a part.
  • the waterjet stream may include fine metal particles to facilitate cutting.
  • the profile can be accurately controlled, and the parts can be accurately produced every time. Additionally, there is no heat-treating step afterwards because it was done prior to grinding and cutting. The final step would be the edge sharpening.
  • Another advantage of the independent profile manufacturing process is that the parts can be made with any number of multiple thickness sections in either profile as illustrated in FIG. 3 . To do this with a traditional stamping process would be difficult as well as expensive, if possible at all.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Surgery (AREA)
  • Mechanical Engineering (AREA)
  • Medical Informatics (AREA)
  • Public Health (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Veterinary Medicine (AREA)
  • Forests & Forestry (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Pathology (AREA)
  • Scissors And Nippers (AREA)
  • Surgical Instruments (AREA)
US10/976,505 2003-11-05 2004-10-29 Multiple-angle scissor blade Abandoned US20050149087A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US10/976,505 US20050149087A1 (en) 2003-11-05 2004-10-29 Multiple-angle scissor blade
US11/735,798 US8114107B2 (en) 2003-11-05 2007-04-16 Laparoscopic scissor blades
US12/552,262 US8590428B2 (en) 2003-11-05 2009-09-01 Multiple-angle scissor blade

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US51772903P 2003-11-05 2003-11-05
US10/976,505 US20050149087A1 (en) 2003-11-05 2004-10-29 Multiple-angle scissor blade

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US11/735,798 Continuation-In-Part US8114107B2 (en) 2003-11-05 2007-04-16 Laparoscopic scissor blades
US12/552,262 Continuation US8590428B2 (en) 2003-11-05 2009-09-01 Multiple-angle scissor blade

Publications (1)

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US20050149087A1 true US20050149087A1 (en) 2005-07-07

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US10/976,505 Abandoned US20050149087A1 (en) 2003-11-05 2004-10-29 Multiple-angle scissor blade
US12/552,262 Active 2026-08-26 US8590428B2 (en) 2003-11-05 2009-09-01 Multiple-angle scissor blade

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Application Number Title Priority Date Filing Date
US12/552,262 Active 2026-08-26 US8590428B2 (en) 2003-11-05 2009-09-01 Multiple-angle scissor blade

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US (2) US20050149087A1 (de)
EP (1) EP1680033B1 (de)
JP (1) JP2007510461A (de)
AU (1) AU2004308247B2 (de)
CA (1) CA2543792A1 (de)
WO (1) WO2005062750A2 (de)

Cited By (67)

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US20070244497A1 (en) * 2003-11-05 2007-10-18 Applied Medical Resources Corporation Laparoscopic scissor blades
US20090306683A1 (en) * 2008-06-04 2009-12-10 Ethicon Endo-Surgery, Inc. Endoscopic drop off bag
US7655004B2 (en) 2007-02-15 2010-02-02 Ethicon Endo-Surgery, Inc. Electroporation ablation apparatus, system, and method
US7815662B2 (en) 2007-03-08 2010-10-19 Ethicon Endo-Surgery, Inc. Surgical suture anchors and deployment device
US8037591B2 (en) 2009-02-02 2011-10-18 Ethicon Endo-Surgery, Inc. Surgical scissors
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US8075572B2 (en) 2007-04-26 2011-12-13 Ethicon Endo-Surgery, Inc. Surgical suturing apparatus
US8100922B2 (en) 2007-04-27 2012-01-24 Ethicon Endo-Surgery, Inc. Curved needle suturing tool
US8114119B2 (en) 2008-09-09 2012-02-14 Ethicon Endo-Surgery, Inc. Surgical grasping device
US8114072B2 (en) 2008-05-30 2012-02-14 Ethicon Endo-Surgery, Inc. Electrical ablation device
US8157834B2 (en) 2008-11-25 2012-04-17 Ethicon Endo-Surgery, Inc. Rotational coupling device for surgical instrument with flexible actuators
US8172772B2 (en) 2008-12-11 2012-05-08 Ethicon Endo-Surgery, Inc. Specimen retrieval device
US8211125B2 (en) 2008-08-15 2012-07-03 Ethicon Endo-Surgery, Inc. Sterile appliance delivery device for endoscopic procedures
US8241204B2 (en) 2008-08-29 2012-08-14 Ethicon Endo-Surgery, Inc. Articulating end cap
US8252057B2 (en) 2009-01-30 2012-08-28 Ethicon Endo-Surgery, Inc. Surgical access device
US8262655B2 (en) 2007-11-21 2012-09-11 Ethicon Endo-Surgery, Inc. Bipolar forceps
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US8262563B2 (en) 2008-07-14 2012-09-11 Ethicon Endo-Surgery, Inc. Endoscopic translumenal articulatable steerable overtube
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US8353487B2 (en) 2009-12-17 2013-01-15 Ethicon Endo-Surgery, Inc. User interface support devices for endoscopic surgical instruments
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US8496574B2 (en) 2009-12-17 2013-07-30 Ethicon Endo-Surgery, Inc. Selectively positionable camera for surgical guide tube assembly
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US8608652B2 (en) 2009-11-05 2013-12-17 Ethicon Endo-Surgery, Inc. Vaginal entry surgical devices, kit, system, and method
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US8771260B2 (en) 2008-05-30 2014-07-08 Ethicon Endo-Surgery, Inc. Actuating and articulating surgical device
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US20200205812A1 (en) * 2018-12-31 2020-07-02 Ethicon Llc Knife for Surgical Stapler and Associated Method of Manufacture with MIM and HIP
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US20100005929A1 (en) 2010-01-14
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US8590428B2 (en) 2013-11-26

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