WO2024111497A1 - 保持具、及び医療器具 - Google Patents

保持具、及び医療器具 Download PDF

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Publication number
WO2024111497A1
WO2024111497A1 PCT/JP2023/041236 JP2023041236W WO2024111497A1 WO 2024111497 A1 WO2024111497 A1 WO 2024111497A1 JP 2023041236 W JP2023041236 W JP 2023041236W WO 2024111497 A1 WO2024111497 A1 WO 2024111497A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
screw
tip
cylindrical body
holder
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.)
Ceased
Application number
PCT/JP2023/041236
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
晋二 今井
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.)
Shiga University of Medical Science NUC
Original Assignee
Shiga University of Medical Science NUC
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 Shiga University of Medical Science NUC filed Critical Shiga University of Medical Science NUC
Priority to EP23894506.7A priority Critical patent/EP4620414A4/en
Priority to JP2024560107A priority patent/JPWO2024111497A1/ja
Publication of WO2024111497A1 publication Critical patent/WO2024111497A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/02—Arrangements for handling screws or nuts
    • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
    • B25B23/10—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means
    • B25B23/105—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means the gripping device being an integral part of the driving bit
    • B25B23/108—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means the gripping device being an integral part of the driving bit the driving bit being a Philips type bit, an Allen type bit or a socket
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875—Screwdrivers, spanners or wrenches
    • A61B17/8886—Screwdrivers, spanners or wrenches holding the screw head
    • A61B17/8888—Screwdrivers, spanners or wrenches holding the screw head at its central region

Definitions

  • the present invention relates to a holder for holding a screw placed inside the human body, and a medical device equipped with the holder.
  • a holder with multiple clamping pieces as disclosed in Patent Document 1, has been used as the holder.
  • the holder in Patent Document 1 is composed of an inner tube with multiple clamping pieces that extend divergently forward, and an outer tube inserted around the outer periphery of the inner tube.
  • the holder in Patent Document 1 can close the multiple clamping pieces by advancing the outer tube, and open the multiple clamping pieces by retracting the outer tube. By opening and closing the clamping pieces, it is possible to grasp the screw 2 with the multiple clamping pieces and remove the screw 2 from the clamping pieces.
  • the present invention has been made in consideration of the above, and its purpose is to provide a holder for holding a screw placed inside the human body, capable of holding the screw 2 and removing the screw without damaging the tissue surrounding the screw, and a medical device equipped with said holder.
  • the present invention includes the following subject matter:
  • a holder for holding a screw placed inside the human body The screw has a hole recessed from a base end of the screw in an axial direction of the screw and having a polygonal cross section;
  • the holder is A shaft, a cylindrical body into which the shaft is inserted; a strip-shaped protruding member protruding from a tip of the cylindrical body in a longitudinal direction of the cylindrical body, the shaft has a tip portion that can be inserted into the hole of the screw while being extended from the tip of the cylindrical body, the tip of the shaft has a cross section in which a part of the outer periphery of a second polygon similar to the first polygon is missing, the part being formed of a groove extending in the longitudinal direction of the shaft, the protruding member being inserted into the groove,
  • the bottom surface of the groove is a tapered surface that is inclined so as to approach a part of the outer circumferential edge of the two polygons toward the tip side of the shaft, With the tip end of the shaft inserted into the hole
  • the tip of the cylinder has an outer diameter that decreases toward the tip of the cylinder, and the base end of the protruding member is joined to the outer circumferential surface of the tip of the cylinder.
  • Item 3 A holder as described in item 1 or 2, in which the tip of the protruding member protrudes on the opposite side of the shaft.
  • Item 4 A holder according to any one of items 1 to 3, A medical instrument comprising the screw.
  • FIG. 1 is a perspective view showing a medical device according to an embodiment of the present invention.
  • FIG. 2 is a perspective view showing a distal end side of a medical device according to an embodiment of the present invention.
  • FIG. 2 is a perspective view showing a state in which a screw 2 has been removed from the retainer according to the embodiment of the present invention.
  • 13A and 13B are diagrams showing the state of the holder when the cylindrical body is advanced relatively to the shaft, where 13A is a perspective view and 13B is a side view.
  • 13A and 13B are diagrams showing the state of the holder when the cylindrical body is moved backward relatively to the shaft, where 13A is a perspective view and 13B is a side view.
  • 1A and 1B are diagrams showing the state of the medical device when the cylindrical body is advanced relative to the shaft, in which 1A is a side view showing the tip end of the medical device, and 1B is a cross-sectional view taken along line a-a in 1A.
  • 1A and 1B are diagrams showing the state of the medical instrument when the cylindrical body is retracted relative to the shaft, in which 1A is a side view showing the tip side of the medical instrument, and 1B is a cross-sectional view along line b-b of 1A.
  • FIG. 1 is a perspective view showing a medical device 1 according to this embodiment.
  • FIG. 2 is a perspective view showing the tip side of a medical device 1 according to an embodiment of the present invention.
  • FIG. 3 is a perspective view showing a state in which a screw 2 has been removed from a retainer 3 according to an embodiment of the present invention.
  • FIGs. 4(A) and 4(B) are views showing the state of the retainer 3 when the cylindrical body 21 is advanced relative to the shaft 20, where FIG. 4(A) is a perspective view and FIG. 4(B) is a side view.
  • FIGs. 5(A) and 5(B) are views showing the state of the retainer 3 when the cylindrical body 21 is retreated relative to the shaft 20.
  • FIG. 5(A) is a perspective view and FIG.
  • FIGs. 6(A) and 6(B) are views showing the state of the medical device 1 when the cylindrical body 21 is advanced relative to the shaft 20, where FIG. 6(A) is a side view showing the tip side of the medical device 1 and FIG. 6(B) is a cross-sectional view taken along line a-a in FIG. 6(A).
  • 7(A) and 7(B) are diagrams showing the state of the medical device 1 when the cylindrical body 21 is retracted relative to the shaft 20, with FIG. 7(A) being a side view showing the tip side of the medical device 1, and FIG. 7(B) being a cross-sectional view taken along line b-b in (A).
  • the medical device 1 according to an embodiment of the present invention comprises a screw 2 for placement inside the human body and a holder 3 for holding the screw 2.
  • the medical device 1 is used, for example, in surgery for recurrent shoulder dislocation, to screw the screw 2 into the graft bone and the recipient bone in order to fix the graft bone to the recipient bone.
  • the screw 2 is made of a metal such as titanium, stainless steel, or a cobalt alloy. As shown in Figures 3, 6, and 7, the screw 2 has a hole 4 formed therein.
  • the hole 4 is recessed from the base end 5 of the screw 2 in the axial direction of the screw 2, and the cross section of the hole 4 has a polygonal shape 6 (in Figures 6(B) and 7(B), a reference numeral 6 is used to indicate the outline of the polygonal shape (the outline of the cross section of the hole 4) in order to specify the polygonal shape).
  • a polygonal shape means a shape having three or more corners.
  • the polygonal shape 6 (the cross-sectional shape of the hole 4) is a regular hexagon, but the polygonal shape 6 (the cross-sectional shape of the hole 4) can be a polygon other than a regular hexagon.
  • the screw 2 has a head 10 and a threaded portion 11 extending from the head 10, and a thread groove 12 is formed on the outer peripheral surface of the threaded portion 11.
  • the head 10 has an annular portion 13 and a truncated cone-shaped portion 14 provided between the annular portion 13 and the threaded portion 11.
  • the truncated cone-shaped portion 14 has a truncated cone shape with an outer diameter that decreases toward the threaded portion 11.
  • the threaded portion 11 extends from a small-diameter end face 15 (FIG. 7(A) and FIG. 7(A)) of the truncated cone-shaped portion 14.
  • the truncated cone-shaped portion 13 extends from a large-diameter end face 16 of the truncated cone-shaped portion 14.
  • the annular portion 13 has a circular outer peripheral ring shape, and the above-mentioned hole 4 is formed by the space inside the annular portion 13.
  • the end face 16 of the truncated cone-shaped portion 14 forms the bottom surface of the hole 4.
  • the present invention does not limit the structure of the screw 2 to the above structure, and various screws having the above hole 4 can be used as the screw 2. Furthermore, the present invention does not limit the material of the screw 2 to metal, and the screw 2 can be made of a material other than metal (e.g., resin).
  • the holder 3 includes a shaft 20, a cylindrical body 21 into which the shaft 20 is inserted, a band-shaped protruding member 22 protruding from the tip of the cylindrical body 21 in the longitudinal direction of the cylindrical body 21, a gripping member 23 connected to the base end of the shaft 20, and a rotating member 24 rotatably attached to the shaft 20 between the cylindrical body 21 and the gripping member 23.
  • the shaft 20, the cylindrical body 21, the protruding member 22, and the rotating member 24 are formed of metal such as stainless steel alloy or titanium.
  • the gripping member 23 includes a main body 23a formed of a resin such as polyethylene, and a connecting portion 23b formed of a metal such as stainless steel alloy or titanium, and the main body 23a is held by the user.
  • the main body 23a has a cavity that opens to the tip side of the main body 23a (left side in FIG. 1), and the base end side of the connecting portion 23b is fitted into the cavity, thereby connecting the connecting portion 23b to the main body 23a.
  • the connecting portion 23b has a cavity that opens to the tip side of the connecting portion 23b (left side in FIG. 1), and the base end of the shaft 20 is fitted into the cavity, thereby connecting the base end of the shaft 20 to the gripping member 23.
  • the cross section of the cavity of the main body portion 23a, the cross section of the cavity of the connecting portion 23b, and the cross section of the base end of the shaft 20 are made into a shape with an angle on the outline.
  • the present invention does not limit the materials of the shaft 20, the cylindrical body 21, the protruding member 22, the rotating member 24, and the gripping member 23 to the above materials, and the shaft 20, the cylindrical body 21, the protruding member 22, the rotating member 24, and the gripping member 23 may be formed from materials other than those described above.
  • the cylindrical body 21 has a cylindrical shape with a circular internal cross section.
  • the tip portion 25 of the cylindrical body 21 has a tapered shape with the outer diameter decreasing toward the tip side of the cylindrical body 21.
  • the inner diameter of the cylindrical body 21 is constant over the entire length of the cylindrical body 21. Note that both the outer diameter and the inner diameter of the tip portion 25 of the cylindrical body 21 may decrease toward the tip side of the cylindrical body 21.
  • the tip 26 of the shaft 20 (Figs. 3 to 7) can be inserted into the hole 4 of the screw 2 while extended from the cylindrical body 21.
  • the tip 26 of the shaft 20 presents a cross section in which a second polygon 30 similar to the first polygon 6 is missing an area 31 constituting a part 30a of the outer periphery of the second polygon 30 (Figs. 6(B) and 7(B) show the reference numeral 30 indicating the outline of the second polygon in order to identify the second polygon).
  • the similarity of the second polygon 30 to the first polygon 6 means that the second polygon 30 coincides with a shape obtained by reducing the first polygon 6.
  • the tip 26 of the shaft 20 has a "cross section in which a range 31 constituting a part 30a of the outer periphery is missing from the second polygon 30" corresponds to the outer periphery of the tip 26 of the shaft 20 including a portion 30b along the outer periphery of the second polygon 30.
  • the first polygon 6 (the shape of the cross section of the hole 4) is a hexagon
  • the second polygon 30 is a regular hexagon similar to the first polygon 6, but the second polygon 30 can also be a polygon other than a regular hexagon, like the first polygon 6.
  • the above-mentioned range 31 is composed of a groove extending in the longitudinal direction of the shaft 20 (hereinafter, the groove will be designated by the reference symbol 31 in "range 31").
  • the bottom surface 32 of the groove 31 is a tapered surface that inclines toward the tip side of the shaft 20 so as to approach the part 30a of the outer periphery of the above-mentioned two polygons 30 (the cross section of the shaft 20 shown in FIG. 6(B) is located closer to the tip side of the shaft 20 than the cross section of the shaft 20 shown in FIG. 7(B), so that the position of the bottom surface 32 of the groove 31 shown in FIG. 6(B) is closer to the part 30a of the outer periphery than the position of the bottom surface 32 of the groove 31 shown in FIG. 7(B)).
  • the present invention does not particularly limit the shape of the area 31 (groove 31) missing from the above-mentioned double polygon 30.
  • the area 34 (Figs. 3 to 7) of the shaft 20 between the tip 26 of the shaft 20 and the base end of the shaft 20 that fits into the cavity of the connecting portion 23b has a cylindrical shape that can be inserted into the cylindrical body 21 over almost its entire length.
  • the base end 40 (Figs. 2 to 7) of the protruding member 22 is joined to the cylindrical body 21. This joining is performed by welding, for example.
  • the protruding member 22 is inserted into the groove 31 of the shaft 20 with the tip 24 of the shaft 20 extending from the tip of the cylindrical body 21.
  • the base end 40 of the protruding member 22 is joined to the outer circumferential surface of the tip 25 of the cylindrical body 21, so that the protruding member 22 is inclined toward the groove 31.
  • the tip 41 (Figs. 3 to 7) of the protruding member 22 protrudes on the opposite side of the shaft 20.
  • the thickness of the area of the protruding member 22 other than the tip 41 toward the base end (cylindrical body side) (Figs. 4 to 7), but the thickness of the area of the protruding member 22 other than the tip 41 may be constant.
  • the rotating member 24 (FIG. 1) is cylindrical with a circular internal cross section, and a screw groove (not shown) is formed on the inner peripheral surface of the base end side 24a of the rotating member 24.
  • the shaft 20 is inserted into the inside of the rotating member 24, and the screw groove of the base end side 24a meshes with a screw groove (not shown) formed on the outer peripheral surface of the shaft 20.
  • an annular groove (not shown) extending in the circumferential direction of the rotating member 24 is formed on the inner peripheral surface of the tip side 24b of the rotating member 24.
  • a protrusion (not shown) formed on the outer peripheral surface of the base end of the cylindrical body 21 is fitted into the annular groove, and the cylindrical body 21 is connected to the rotating member 24 so that it does not rotate together with the rotating member 24.
  • the holder 3 can advance the rotating member 24 and the cylindrical body 21 toward the tip side of the shaft 20 relative to the shaft 20 by rotating the rotating member 24 forward with the fingers of the hand. Also, the rotating member 24 and the cylindrical body 21 can retreat toward the base end side of the shaft 20 relative to the shaft 20 by rotating the rotating member 24 in the reverse direction with the fingers of the hand.
  • the cylindrical body 21 does not rotate, and during the above-mentioned advancement, the protruding member 22 advances along the groove 31, and during the above-mentioned retreat, the protruding member 22 retreats along the groove 31.
  • the above-mentioned advancement of the protruding member 22 causes the tip 41 of the protruding member 22 to be exposed from the groove 31 (FIG. 6), and the above-mentioned retreat of the protruding member causes the tip 41 of the protruding member 22 to be not exposed from the groove 31 (FIG. 7).
  • the rotating member 24 is rotated in the forward direction to move the tube 21 toward the tip of the shaft 20 relative to the shaft 20, so that the tip 41 of the protruding member 22 is exposed from the groove 31, and the tip 41 of the protruding member 22 and the tip 26 of the shaft 20 come into close contact with the inner circumferential surface of the hole 4 of the screw 2 (FIG. 6B).
  • the shaft 20 With the screw 2 held by the retainer 3, the shaft 20 can be rotated with the hand holding the gripping member 23 (more precisely, by rotating the entire retainer 3), and the screw 2 can be screwed into the bone by the rotation of the screw 2.
  • the screw 2 can be held in the holder 3 by bringing the tip 41 of the protruding member 22 and the tip 26 of the shaft 20 into close contact with the inner circumferential surface of the hole 4 of the screw 2.
  • the screw 2 can be removed from the holder 3 by releasing the close contact within the hole 4 of the screw 2.
  • the screw 2 can be held and removed without having to place parts of the holder around the screw 2 as in the conventional technology. Therefore, according to this embodiment, the screw 2 can be held in the holder 3 and the screw 2 can be removed from the holder 3 without damaging the human tissue surrounding the screw 2.
  • the protruding member 22 is inclined at an angle according to the gradient of the outer peripheral surface of the tip portion 25, so that the protruding member 22 can be inserted into the groove 31 while minimizing curvature or bending of the protruding member 22.
  • This allows the protruding member 22 to be strongly pressed into the hole 4 of the screw 2, so that the tip portion 41 of the protruding member 22 and the tip portion 26 of the shaft 20 can be strongly adhered to the inner surface of the hole 4. This makes it possible to prevent the screw 2 from coming off the retainer 3 when an external force is applied to the screw 2.
  • the outer diameter of the tip portion 25 of the cylindrical body 21 decreases toward the tip side of the cylindrical body 21, but the outer diameter of the tip portion 25 of the cylindrical body 21 may be constant.
  • the shape of the protruding member 22 can be adjusted (for example, by curving or bending the protruding member 22) to allow the protruding member 22 to be inserted into the groove 31.
  • the gripping member 23 is not necessarily required and may be omitted.
  • the shaft 20, except for the tip 26, is made to have a cylindrical shape that can be inserted into the cylindrical body 21 over almost its entire length.
  • the rotating member 24 is not necessarily required and may be omitted.
  • the rotating member 24 for example, by pushing the cylindrical body 21 with a hand or by pulling the shaft 20 with a hand, it is possible to "advance the cylindrical body 21 toward the tip end of the shaft 20 relative to the shaft 20," and by pulling the cylindrical body 21 with a hand or by pushing the shaft 20 with a hand, it is possible to "retract the cylindrical body 21 toward the base end of the shaft 20 relative to the shaft 20.”
  • the shape of the internal cross section of the cylindrical body 21 was circular, but the shape of the internal cross section of the cylindrical body 21 may be a shape other than circular.
  • the shape of the range other than the tip portion 26 of the shaft 20 may also be various shapes that can be inserted into the cylindrical body 21.
  • Reference Signs List 1 Medical instrument 2 Screw 3 Holder 5 Base end of screw 6 First polygon 4 Hole of screw 20 Shaft 21 Cylinder 22 Protruding member 25 Tip of cylinder 26 Tip of shaft 30 Second polygon 30a Part of outer periphery of second polygon 31 Area constituting part of outer periphery of second polygon, groove 32 Bottom surface of groove 40 Base end of protruding member 41 Tip of protruding member

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medical Informatics (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Mechanical Engineering (AREA)
  • Surgical Instruments (AREA)
  • Dental Prosthetics (AREA)
PCT/JP2023/041236 2022-11-22 2023-11-16 保持具、及び医療器具 Ceased WO2024111497A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP23894506.7A EP4620414A4 (en) 2022-11-22 2023-11-16 Holding device and medical device
JP2024560107A JPWO2024111497A1 (https=) 2022-11-22 2023-11-16

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022186148 2022-11-22
JP2022-186148 2022-11-22

Publications (1)

Publication Number Publication Date
WO2024111497A1 true WO2024111497A1 (ja) 2024-05-30

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ID=91195663

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/041236 Ceased WO2024111497A1 (ja) 2022-11-22 2023-11-16 保持具、及び医療器具

Country Status (3)

Country Link
EP (1) EP4620414A4 (https=)
JP (1) JPWO2024111497A1 (https=)
WO (1) WO2024111497A1 (https=)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10042424A1 (de) * 2000-08-30 2002-03-28 Aesculap Ag & Co Kg Schraubendreher für Knochenschrauben
US20080215061A1 (en) * 2005-09-09 2008-09-04 Aesculap Ag & Co. Kg Screwdriver for bone screws
JP2014517718A (ja) * 2011-03-28 2014-07-24 シンセス・ゲーエムベーハー 相互連結式駆動装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003311640A (ja) 2002-04-30 2003-11-05 Yoneaki Uchizono スクリュードライバーに装着したネジ類の着脱装置及びネジ類の整理台
US8777960B2 (en) * 2011-03-28 2014-07-15 DePuy Synthes Products, LLC Interlock driving instrument

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10042424A1 (de) * 2000-08-30 2002-03-28 Aesculap Ag & Co Kg Schraubendreher für Knochenschrauben
US20080215061A1 (en) * 2005-09-09 2008-09-04 Aesculap Ag & Co. Kg Screwdriver for bone screws
JP2014517718A (ja) * 2011-03-28 2014-07-24 シンセス・ゲーエムベーハー 相互連結式駆動装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4620414A1 *

Also Published As

Publication number Publication date
EP4620414A4 (en) 2026-03-04
EP4620414A1 (en) 2025-09-24
JPWO2024111497A1 (https=) 2024-05-30

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