US20020020255A1 - Sleeve-shaped device to retain screws while these are turned into an object such as a bone by means of a screw driver - Google Patents
Sleeve-shaped device to retain screws while these are turned into an object such as a bone by means of a screw driver Download PDFInfo
- Publication number
- US20020020255A1 US20020020255A1 US09/921,220 US92122001A US2002020255A1 US 20020020255 A1 US20020020255 A1 US 20020020255A1 US 92122001 A US92122001 A US 92122001A US 2002020255 A1 US2002020255 A1 US 2002020255A1
- Authority
- US
- United States
- Prior art keywords
- sleeve
- screw
- handle
- handle portion
- locking element
- 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.)
- Granted
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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
- A61B17/56—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, setting implements or the like
- 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
- A61B17/8891—Screwdrivers, spanners or wrenches holding the screw head at its periphery
-
- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/17—Guides or aligning means for drills, mills, pins or wires
- A61B17/1735—Guides or aligning means for drills, mills, pins or wires for rasps or chisels
Definitions
- the invention relates to a sleeve-shaped device to retain screws while these are turned into an object, such as a bone, by means of a screw-driver.
- the safety sleeve is displaceable on the catch or gripping sleeve and serves for locking the expandable portion in order that the screw be caught in the catch sleeve during the turn-in operation.
- the safety sleeve is slidingly movable between two positions on the catch sleeve. It takes its blocking positioning when in the front position, and allows an expansion of the expandable portion, when in the rear position. This allows the device to receive a screw or to be removed from the screw which was turned in.
- the safety sleeve usually is biased towards the blocking position by means of a spring.
- a spring e.g. by surrounding soft parts, while the device is being inserted into the location at which a screw is intended to be turned in, which no longer guarantees the securing function of the safety sleeve.
- the safety sleeve is locked on the catch sleeve, i.e. by means of at least one ball, for example mounted on the safety sleeve.
- the ball engages an annular groove in the catch sleeve and is impeded by an inner portion of the second handle portion from moving outwardly. If the second handle portion is moved relative to the safety sleeve or the catch sleeve relative motion initially does not take place between the sleeves, i.e. the safety sleeve thus cannot be moved into the releasing position from the blocking position.
- the second handle portion reaches a relative position in which the ball may escape into a recess within the second handle portion which may occur while a first spring is compressed between the handle portion and a shoulder of the safety sleeve.
- the first spring may move the safety sleeve again with respect to the second handle portion towards a stop into a releasing position.
- the second handle portion initially has moved away from the safety sleeve during its motion while the first spring is compressed.
- the safety sleeve is allowed to follow by sliding while the first spring is released so that the expandable portion now can receive or release a screw.
- the shank of the screw-driver which is passed through the catch sleeve is located by means of another locking ball which engages an annular groove of the shank.
- a portion of the second handle portion normally prevents the locking ball from moving out. If the two components are intended to be separated from each other the second handle portion is required to move a predetermined distance relative to the catch sleeve against the force of the further spring until the aforementioned locking ball enters a further recess of the second handle portion.
- the distance required to be passed through is larger than the distance which is needed for a relative motion between the second handle portion and the safety sleeve in order that this locking ball can be moved into the releasing position.
- the safety sleeve when in the blocking position, is prevented from axially moving to the releasing position and, thus, cannot be displaced by forces applied from the outside. Such forces, for example, will occur if the assembly is passed through a tissue until the screw which has been received is screwed in the desired location, e.g. into a bone.
- the first spring preferably is weaker than the second spring.
- the second handle portion has a sleeve portion and a handling portion which are in an operative communication with each other.
- the sleeve portion may be screwed onto an axial collar of the handling portion.
- the second inner shoulder of the second handle portion and the radial recess are defined by a ring which is disposed within the second handle portion.
- the ring may be screwed into the sleeve-shaped portion of the second handle portion.
- the described recesses into which the locking balls may escape preferably are formed in a ring shape in the interior of the second handle portion.
- FIG. 1 shows a section through the sleeve-shaped device of the present invention with the screw-driver and screw being shown in phantom.
- the preferred retaining device 10 illustrated in FIG. 1 has an inner catch sleeve 12 including an expandable portion 14 at a first end of the device shown in FIG. 1, which portion 14 consists of individual resilient segments 16 which are longitudinally separated in the circumferential direction by means of slots 18 that extend in an axially parallel relationship. At the first end or free end of the device, the segments 16 internally define a recess 20 to receive the head of screw 22 shown in phantom.
- a catch sleeve of this type is generally known in the prior art.
- the segments 16 each have an external ramp surface 24 which extends towards the first end in a thickened portion 26 .
- a preferred safety sleeve 28 which is shown in its blocking position in FIG. 1, slides on the catch sleeve 12 . It spreads over the thickened portions 26 of portion 14 , thus preventing the segments 16 from radially expanding outwardly. Thus, a screw 22 which has been received in recess 20 is prevented from falling out or coming off.
- the catch sleeve 12 has a radial collar 30 which holds locking balls 34 in opposed bores 32 .
- the locking balls interact with an annular groove 36 of a shank 38 of a screw-driver which is shown in phantom but not in detail.
- the shank 38 of the screw-driver is passed through the whole catch sleeve 12 and a blade 40 or the like interacts with the head of the screw 22 in order to turn it into an object which is not shown, e.g. a bone.
- two balls 34 are used.
- One or more first locking balls 34 may be used.
- a sleeve-shaped first handle portion 42 is seated with a bore which is coaxial with the bore of the catch sleeve 12 .
- a second handle portion 44 encircles the sleeves 12 and 28 at the second end of the device and engages a portion of the first handle portion 42 facing the first end.
- the handle portion 44 has an external sleeve portion 46 which is conical externally and a handle portion 48 with the part of the sleeve portion 46 towards the second end being screwed onto an axial collar 50 of the handle portion 48 .
- a ring 52 is seated in the sleeve portion 46 between the collar 50 and an inner shoulder 51 of the second handle portion 44 .
- the ring has a radial annular recess 54 and a helical spring 58 is disposed between an inner radial shoulder 39 of the ring 52 and the radial collar 30 of the catch sleeve 12 .
- a spring 64 is disposed between a radial collar 60 and an inner radial shoulder 62 of the sleeve portion 46 .
- it also is a helical spring.
- the radial collar 60 receives at least one second locking ball 41 located adjacent groove 66 in sleeve 12 , which ball is radially movable in an appropriate bore in collar 60 and is unable to radially escape outwardly when the parts are in the position shown in the FIGURE.
- the second ball acts in conjunction with outer annular groove 66 of the catch sleeve 12 .
- the sleeve portion 46 has an inner annular groove or recess 68 into which the aforementioned second locking ball can radially escape if the annular collar 60 is within the recess 68 .
- the second locking ball 41 disengages from sleeve 12 . This allows sleeve 28 and collar 60 , which may be integral therewith, to move towards the second end under the action of spring 64 .
- the handle 44 will be retracted even farther until the balls 34 slide into the recess 54 and, thus, enable the entire assembly to be displaced on the shank 38 against a step (not shown) against which first handle portion 42 strikes in order to assume a defined position.
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- 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)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
Description
- The invention relates to a sleeve-shaped device to retain screws while these are turned into an object, such as a bone, by means of a screw-driver.
- Devices of such a type have been generally known as shown in U.S. Pat. Nos. 3,498,351 and 4,763,548. For example, such devices make it easier for a surgeon to screw in bone screws or similar screws under poor handling and visual conditions. The expandable portion serves for receiving the screw, particularly the screw head and, thus, enables a screw to be received at a location remote from the object. Here, the shank of the screw-driver may already be within the catch or gripping sleeve and its blade or its corresponding engaging end may already have been brought into engagement with the screw. The safety sleeve is displaceable on the catch or gripping sleeve and serves for locking the expandable portion in order that the screw be caught in the catch sleeve during the turn-in operation. For this purpose, the safety sleeve is slidingly movable between two positions on the catch sleeve. It takes its blocking positioning when in the front position, and allows an expansion of the expandable portion, when in the rear position. This allows the device to receive a screw or to be removed from the screw which was turned in.
- The safety sleeve usually is biased towards the blocking position by means of a spring. However, if such a device is inserted there is a risk of the safety sleeve being pushed back against the spring, e.g. by surrounding soft parts, while the device is being inserted into the location at which a screw is intended to be turned in, which no longer guarantees the securing function of the safety sleeve.
- Therefore, it is the object of this invention to provide a sleeve-shaped device to retain screws while these are turned into an object by means of a screw-driver wherein the safety sleeve maintains it blocking position regardless of external forces engaging it.
- According to the invention, the safety sleeve is locked on the catch sleeve, i.e. by means of at least one ball, for example mounted on the safety sleeve. The ball engages an annular groove in the catch sleeve and is impeded by an inner portion of the second handle portion from moving outwardly. If the second handle portion is moved relative to the safety sleeve or the catch sleeve relative motion initially does not take place between the sleeves, i.e. the safety sleeve thus cannot be moved into the releasing position from the blocking position. Not until the second handle portion reaches a relative position in which the ball may escape into a recess within the second handle portion which may occur while a first spring is compressed between the handle portion and a shoulder of the safety sleeve. The first spring may move the safety sleeve again with respect to the second handle portion towards a stop into a releasing position. The second handle portion initially has moved away from the safety sleeve during its motion while the first spring is compressed.
- After the locking mechanism is released the safety sleeve is allowed to follow by sliding while the first spring is released so that the expandable portion now can receive or release a screw. The shank of the screw-driver which is passed through the catch sleeve is located by means of another locking ball which engages an annular groove of the shank. Also here, a portion of the second handle portion normally prevents the locking ball from moving out. If the two components are intended to be separated from each other the second handle portion is required to move a predetermined distance relative to the catch sleeve against the force of the further spring until the aforementioned locking ball enters a further recess of the second handle portion. The distance required to be passed through here is larger than the distance which is needed for a relative motion between the second handle portion and the safety sleeve in order that this locking ball can be moved into the releasing position.
- It follows from the above explanation that the safety sleeve, when in the blocking position, is prevented from axially moving to the releasing position and, thus, cannot be displaced by forces applied from the outside. Such forces, for example, will occur if the assembly is passed through a tissue until the screw which has been received is screwed in the desired location, e.g. into a bone.
- According to an aspect of the invention, the first spring preferably is weaker than the second spring. According to another aspect of the invention, the second handle portion has a sleeve portion and a handling portion which are in an operative communication with each other. For example, the sleeve portion may be screwed onto an axial collar of the handling portion.
- According to a further aspect of the invention, the second inner shoulder of the second handle portion and the radial recess are defined by a ring which is disposed within the second handle portion. For example, the ring may be screwed into the sleeve-shaped portion of the second handle portion. The described recesses into which the locking balls may escape preferably are formed in a ring shape in the interior of the second handle portion.
- The invention will now be explained in greater detail with reference to an embodiment shown in a drawing.
- FIG. 1 shows a section through the sleeve-shaped device of the present invention with the screw-driver and screw being shown in phantom.
- The
preferred retaining device 10 illustrated in FIG. 1 has aninner catch sleeve 12 including anexpandable portion 14 at a first end of the device shown in FIG. 1, whichportion 14 consists of individualresilient segments 16 which are longitudinally separated in the circumferential direction by means ofslots 18 that extend in an axially parallel relationship. At the first end or free end of the device, thesegments 16 internally define arecess 20 to receive the head ofscrew 22 shown in phantom. A catch sleeve of this type is generally known in the prior art. Thesegments 16 each have anexternal ramp surface 24 which extends towards the first end in a thickenedportion 26. - A
preferred safety sleeve 28 which is shown in its blocking position in FIG. 1, slides on thecatch sleeve 12. It spreads over the thickenedportions 26 ofportion 14, thus preventing thesegments 16 from radially expanding outwardly. Thus, ascrew 22 which has been received inrecess 20 is prevented from falling out or coming off. - At its opposite second end, adjacent the
handle 42, thecatch sleeve 12 has aradial collar 30 which holdslocking balls 34 inopposed bores 32. As can be seen in the drawing the locking balls interact with anannular groove 36 of ashank 38 of a screw-driver which is shown in phantom but not in detail. Theshank 38 of the screw-driver is passed through thewhole catch sleeve 12 and ablade 40 or the like interacts with the head of thescrew 22 in order to turn it into an object which is not shown, e.g. a bone. While in the preferred embodiment twoballs 34 are used. One or morefirst locking balls 34 may be used. - At the second end of
catch sleeve 12, a sleeve-shapedfirst handle portion 42 is seated with a bore which is coaxial with the bore of thecatch sleeve 12. Asecond handle portion 44 encircles thesleeves first handle portion 42 facing the first end. Thehandle portion 44 has anexternal sleeve portion 46 which is conical externally and ahandle portion 48 with the part of thesleeve portion 46 towards the second end being screwed onto anaxial collar 50 of thehandle portion 48. Aring 52 is seated in thesleeve portion 46 between thecollar 50 and an inner shoulder 51 of thesecond handle portion 44. The ring has a radialannular recess 54 and ahelical spring 58 is disposed between an inner radial shoulder 39 of thering 52 and theradial collar 30 of thecatch sleeve 12. - A
spring 64 is disposed between aradial collar 60 and an innerradial shoulder 62 of thesleeve portion 46. In the preferred embodiment, it also is a helical spring. Theradial collar 60 receives at least one second locking ball 41 locatedadjacent groove 66 insleeve 12, which ball is radially movable in an appropriate bore incollar 60 and is unable to radially escape outwardly when the parts are in the position shown in the FIGURE. The second ball acts in conjunction with outerannular groove 66 of thecatch sleeve 12. Thesleeve portion 46 has an inner annular groove or recess 68 into which the aforementioned second locking ball can radially escape if theannular collar 60 is within therecess 68. Upon escape, the second locking ball 41 disengages fromsleeve 12. This allowssleeve 28 andcollar 60, which may be integral therewith, to move towards the second end under the action ofspring 64. - The description of how the device shown functions is based on the illustration in the FIGURE in which the
expandable portion 14 has received the head of a screw and thesafety sleeve 28 blocks the expansion ofexpandable portion 14. Now, a screw can be turned into an object by means of the screw-driver which has been received in the device. The mechanism interlocking the twosleeves safety sleeve 28 rearwards (towards the second end) and the expandable portion to be expanded. If the device now is to be separated from thescrew 22handle portion 48 is pulled towardsfirst handle portion 42 while thesprings safety sleeve 28 abandoning its position relative to thecatch sleeve 12. This causes thering 52 to move away from theradial collar 60, i.e. for a time until thecollar 60 is in therecess 68 and the second locking ball 41 can radially escape. If this is the case thespring 64 pushes thesafety sleeve 28 towards thering 52 again until it hits against it. As a result, thesafety sleeve 28 assumes its releasing position and since theexpandable portion 14 is expanded the device may be removed from the head of thescrew 22. Usually, thehandle 44 will be retracted even farther until theballs 34 slide into therecess 54 and, thus, enable the entire assembly to be displaced on theshank 38 against a step (not shown) against which first handleportion 42 strikes in order to assume a defined position. - Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (20)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE20013905U DE20013905U1 (en) | 2000-08-12 | 2000-08-12 | Sleeve-shaped device for holding screws when screwing into an object, e.g. into a bone with the help of a screwdriver |
DE20013905U | 2000-08-12 | ||
DE20013905.3 | 2000-08-12 |
Publications (2)
Publication Number | Publication Date |
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US20020020255A1 true US20020020255A1 (en) | 2002-02-21 |
US6415693B1 US6415693B1 (en) | 2002-07-09 |
Family
ID=7945094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/921,220 Expired - Lifetime US6415693B1 (en) | 2000-08-12 | 2001-08-02 | Sleeve-shaped device to retain screws while these are turned into an object such as a bone by means of a screw driver |
Country Status (5)
Country | Link |
---|---|
US (1) | US6415693B1 (en) |
EP (1) | EP1192912B1 (en) |
JP (1) | JP4190171B2 (en) |
DE (2) | DE20013905U1 (en) |
ES (1) | ES2233527T3 (en) |
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US20060074445A1 (en) * | 2004-09-29 | 2006-04-06 | David Gerber | Less invasive surgical system and methods |
US20070078460A1 (en) * | 2005-08-25 | 2007-04-05 | Robert Frigg | Methods of spinal fixation and instrumentation |
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US4779494A (en) * | 1987-04-21 | 1988-10-25 | New Concepts | Screwdriver having screw gripping feature |
DE4441965C1 (en) * | 1994-11-25 | 1996-06-13 | Elekta Instr Ab | screwdriver |
DE19832303C2 (en) * | 1998-07-17 | 2000-05-18 | Storz Karl Gmbh & Co Kg | screwdriver |
US6286401B1 (en) * | 2000-06-08 | 2001-09-11 | Mohammed Ali Hajianpour | Screwdriver with holding feature for socket head screws |
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2000
- 2000-08-12 DE DE20013905U patent/DE20013905U1/en not_active Expired - Lifetime
-
2001
- 2001-07-11 DE DE50105049T patent/DE50105049D1/en not_active Expired - Lifetime
- 2001-07-11 EP EP01116887A patent/EP1192912B1/en not_active Expired - Lifetime
- 2001-07-11 ES ES01116887T patent/ES2233527T3/en not_active Expired - Lifetime
- 2001-08-02 US US09/921,220 patent/US6415693B1/en not_active Expired - Lifetime
- 2001-08-09 JP JP2001241634A patent/JP4190171B2/en not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
---|---|
DE50105049D1 (en) | 2005-02-17 |
ES2233527T3 (en) | 2005-06-16 |
DE20013905U1 (en) | 2000-12-21 |
EP1192912A1 (en) | 2002-04-03 |
EP1192912B1 (en) | 2005-01-12 |
US6415693B1 (en) | 2002-07-09 |
JP2002125979A (en) | 2002-05-08 |
JP4190171B2 (en) | 2008-12-03 |
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