WO2003070116A1 - Cutting tool and integrated protective device therefor - Google Patents

Cutting tool and integrated protective device therefor

Info

Publication number
WO2003070116A1
WO2003070116A1 PCT/FR2003/000544 FR0300544W WO03070116A1 WO 2003070116 A1 WO2003070116 A1 WO 2003070116A1 FR 0300544 W FR0300544 W FR 0300544W WO 03070116 A1 WO03070116 A1 WO 03070116A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
position
portion
means
blade
handle
Prior art date
Application number
PCT/FR2003/000544
Other languages
French (fr)
Inventor
Raphaël MOSSERI
Original Assignee
Mosseri Raphael
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

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32Surgical cutting instruments
    • A61B17/3209Incision instruments
    • A61B17/3211Surgical scalpels, knives; Accessories therefor
    • A61B17/3213Surgical scalpels, knives; Accessories therefor with detachable blades
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32Surgical cutting instruments
    • A61B17/3209Incision instruments
    • A61B17/3211Surgical scalpels, knives; Accessories therefor
    • A61B2017/32113Surgical scalpels, knives; Accessories therefor with extendable or retractable guard or blade

Abstract

The invention concerns an integrated device for a cutting tool comprising means (7) for isolating a blade (8), a handle connected to said isolating means through a first elastic linking means (6) for moving the handle between a passive position and an active position under the effect of an external pressure, said handle including a proximal part (3) linked to said isolating means through said first elastic linking means and to a distal part (4) designed to bear said blade through a second linking means (105) for pivoting the two parts between the passive position, wherein the two parts are inclined at an angle α, and the active position wherein the two parts are arranged at an angle β greater than the angle α, said isolating means including an upper stop means (76) against which the blade is urged to be pressed.

Description

CUTTING TOOL AND DEVICE FOR INTEGRATED PROTECTION CUTTING TOOL

The present invention relates to an integrated protective device for cutting tool and a cutting tool, in particular a medical instrument such as a scalpel provided with such a device.

In the medical field, many sharp instruments are used by the medical staff, nurses, doctors, surgeons and any surrounding person, who can injure themselves during handling. Apart from the surgical procedure, the current risks involved in the use of a cutting instrument such as a knife, can cause an accidental wound to the operator, either by itself or by a third party in the delivery of the instrument, a plague of operating aid in the return of the instrument, or déstérilisation table field when the knife is placed on the instrument table. The consequences are, in general terms, a risk of transmission of infectious agents, viral (hepatitis viruses, HIV, ..), bacterial or parasitic, and anatomically and functionally, a risk section of tendons, section of a nerve or a collateral pedicle of a finger.

To avoid such risks, it is known from PCT / FR98 / 01838 filed by the Applicant and according to the preamble of claim 1, a scalpel provided with an integrated protection device, as shown in Figure 12. said knife protection device 300 includes an isolation means 302 for isolating from the outside a blade forming the distal portion 301 of the cutting tool, this isolating means having the general shape of a fork whose branches 303 304 define an opening for the passage of said blade between a protected position e wherein said legs at least partially surround said blade, and a working position wherein the blade is disengaged from said insulating means. The fork 303 is connected to a sleeve 306 forming the proximal portion of the scalpel by a resilient connecting means 305 allowing relative movement means of the knife with respect to said insulation 302 between a passive position in which said blade 301 is biased in the protected position, the handle 305 in abutment against an abutment 307 of the isolation means, and an active position, under the effect of an external pressure opposing the biasing force of the connecting means 305, wherein the blade is in the working position, the handle 306 in abutment against a travel end abutment 308 of the insulating means. Such protective device provides efficient protection of the blade. However, in its working position illustrated in Figure 12, all or the major part of the blade is disposed below the protective branches 304, and the user does not or difficult to see the blade, in particular the cutting tip. Moreover, branches have significant congestion which can make the achievement of certain cuts, when they should be effe ctuées in a restricted operating field.

Also known by US-A-5 377.413, scalpel comprising a blade slidably mounted in the groove of a plate and a deformable leg to move the blade in the manner of a cutter. Such a scalpel is operating and use completely different from those according to the invention, since a lancet according to the invention is designed as a dissector, the blade being carried by a branch opposite to that for the protection, while q ue in a system of the type cutter, the leg protecting door and also guides the slide and the other branch only serving as sliding means.

The present invention aims to eliminate the aforementioned disadvantages by providing a cutting tool, particularly a medical knife whose blade guard does not interfere or little use of the tool.

For this purpose, the present invention provides an integrated protective device for a cutting tool, t comprenan an isolation means for isolating from the outside at least the cutting portion of a blade for forming the distal portion of the tool cutting, this isolation means having an opening for the passage of said blade between a protected position wherein said isolation means at least partially surrounds said blade, and a working position wherein the blade is disengaged from said isolation means a sleeve for forming the proximal portion of the cutting tool and connected to said insulating means by a first elastic connection means allowing relative movement of the handle with respect to said insulating means between a passive position in which said blade is biased in the shielded position and an active position under the effect of an external pressure opposing the biasing force of the first connecting means, in laquell e the blade is in the operative position, characterized in that the handle of the cutting tool comprises two parts connected by a second connecting means, a proximal portion connected to said insulating means by said first elastic coupling and pivotable with respect to said insulation means and a distal portion for holding said blade, said isolation means comprising an upper abutment means against which is adapted to abut the blade both in protected work positions, - said second connecting means permitting relative pivoting of the two shaft parts between the passive position of the handle, wherein the two parts are inclined with respect to one another of a α angle, and the active position of the handle wherein the two handle portions are disposed at an angle β greater than the aforementioned angle α.

Such a structure enables to provide a scalpel which only the cutting portion of the blade is exposed when the blade is in its working position and whose end projecting from the insulating means, is better visible by the user . According to one feature, the average ion isolate comprises a lower stopper means downstream of the fulcrum of the external pressure on the handle, against which lower stop means is intended to abut the distal portion in the position of working the blade.

Advantageously, the second connecting means is an elastic means, stiffness smaller than the first means of elastic connection, said second connection means being biased, for example by bending, in the passive handle position, so that movement of sleeve between its two positions is effected by pivoting of both the proximal portion with respect to said insulation means and the distal portion compared to the proximal portion.

Advantageously, said second connecting means, is biased, for example by bending the elastic restoring force of the first connecting means in the passive handle position, so as to tilt the two handle portions and generate a torque on the two parts of sleeve with respect to a pivot axis located between said handle portions for pivoting the two parts about said pivot axis when said applied external pressure on the sleeve is opposed to the elastic restoring force of the first means link.

According to one embodiment, said second elastic connection means includes a strip having a longitudinal plane parallel to the blade the general shape of a capital omega (Ω), the end of each branch is secured to the end facing - in relation to each of the two shaft parts, the two arms of the omega away from one another during the handle displacement towards its active position. According to another embodiment, said second resilient connection means comprises at least one sipe substantially zero plane, each end of which is fixed to the end face-vis each of the two parts of the handle, said blade being deformed bending in the passive position of the handle and substantially planar in the active position of the handle.

According to another embodiment, the ends of the two parts of the handle vis-à-vis are supported against one another by support surfaces defining the pivot axis on the two shaft parts. In the latter embodiment, said second resilient connection means may advantageously comprise at least one slat having in a longitudinal plane parallel to the blade the shape of an inverted V whose apex is oriented outwards and each end is fixed to the end face-vis each of the two parts of the handle, the two branches of the V being biased in the position spaced from each other in the passive position of the handle and approaching one of each other during the handle displacement towards its active position, the bearing surfaces of the two parts being arranged on the opposite side of the slat at the top. In yet another embodiment, the second connecting means is a non-elastic articulated connection means.

Advantageously, the insulating means comprises a generally fork-shaped member the legs of which define said opening for the passage of the blade of the cutting tool, the free ends of the fork being linked by a bridge of material constituting said means upper stop for the end of the blade. Advantageously, each branch of the fork extends in a plane substantially parallel to the blade plane and has a contour which is at least circumscribes the contour of the blade in the protected position.

Preferably, the handle, for example the proximal portion thereof, has on its outer upper face a flat surface serving as a bearing surface for the user's index for exerting said external pressure, said flat being situated generally in upstream of the lower stop means, the fork-shaped member optionally having on its two outer lateral faces a flat portion serving as a bearing surface for the fingers (P, M) of the user.

Advantageously, the two branches of the fork are connected by a proximal portion extending from the first resilient connection means, so that its free end serves as a lower stop means. According to one feature, the device comprises means for locking lockable / unlockable the handle in its passive position, said means comprising a lug mounted on one of the elements constituted by the sleeve and the insulating means, a deformable junction zone for the rotation of said tab which is provided with at least one stud at its free end, said stud being adapted to be engaged upon rotation of the lug in a groove on the other of said elements.

According to another feature, the distal portion of the handle carries on its upper edge a plate arranged perpendicular to the plane of the blade and extending beyond the distal end of said distal portion, said platen being adapted to bear by its underside against the upper stop means for guiding movement of the sleeve during its movement between its passive position and its active position. Advantageously, the distal end of the plate is provided with a tip adapted to be engaged in the opening of the insulation and support means below the upper stop means to block the handle in its passive position.

The invention also provides a cutting tool such as a scalpel comprising a protection device as defined above and a blade mounted on the distal portion of the reed m so that the blade plane is disposed perpendicular to a pivot axis the handle.

The invention will be better understood and other objects, details, features and advantages thereof will appear more clearly during the detailed explanatory description which follows three currently preferred particular embodiments of the invention, given only illustrative and non-limiting, with reference to the accompanying schematic drawing.

On this drawing :

- Figure 1 is a perspective view of a lancet in the passive position according to a first embodiment of the invention, comprising a lamella, planar break, as a means of resilient connection between the two handle portions;

- Figure 2 is a side view of the scalpel of Figure 1 in the active position; - Figure 3 is a side view of a lancet in the passive position, according to a second embodiment of the invention, comprising a strip of omega as an elastic connecting means between the two handle portions;

- Figure 4 is a view similar to Figure 3 showing the knife in its active position;

- Figure 5 is a side view of a lancet in the passive position according to a third embodiment of the invention, comprising two slats inverted V-like elastic linking means between the two handle portions; - Figure 6 is a view similar to Figure 5 showing the knife in its active position;

- Figure 7 is an enlarged partial view in section on a longitudinal plane of the scalpel of Figure 3, illustrating an alternative embodiment; - Figure 8 is a perspective view of a scalpel showing another embodiment of the lancet of Figure 3;

- Figure 9 is a longitudinal sectional view of the scalpel of Figure 8 equipped with a blade;

- Figures 10 and 11 are side views of the scalpel of Figure 9, respectively illustrating the lancet blocked in the passive position and the knife in a working position; and - Figure 12 is a perspective view of a scalpel provided with a protection of the prior art device.

Referring to Figures 1 and 2 illustrating a first embodiment of the present invention, the knife 1 includes a handle 2 formed in two parts 3, 4 of generally parallelepiped shape, for example of plastic material, interconnected by means of resilient connection consists of a metallic lamina 5, elastic, rectangular. More specifically, the handle 2 comprises a proximal said part 3 connected by a connection zone 6 to a fork-shaped element 7, and a distal portion 4 bearing a blade 8. When the knife 1 is in its active position shown in 2, the metal plate 5 is substantially flat, at rest, its large faces substantially perpendicular to the median plane passing through the parts 3, 4 and the element 7, and when the knife is in its passive position shown in Figure 1, the metal strip is deformed in bending. The metal plate 5 is assembled to the end edges 31, 41 vis-vis the two handle portions, eg during the molding operation of the latter, so that the two parts form an angle β of about 180 ° (+/- 10 ° around). The angles are calculated by modulo 180 °. The transverse dimension of the metal plate 5 is less than or equal to that of the two parts 3, 4 of the handle, so that it is not projecting with respect to the large side faces of the two parts 3, 4. The metal plate 5 can be coated with a plastic layer identical to that constituting the two handle portions. Alternatively, the metal plate 5 may be replaced by a plastic strip formed in one piece with the two shaft parts. The distal portion 4 has an end portion 44 opposite the proximal portion, of smaller transverse dimension and provided with a lateral lug 45 for latching of a blade 8 provided with an opening 84 of complementary shape that said lateral lug. The knife provided with the protection device according to the invention can thus be sold separately from the blade.

The fork-shaped element 7 comprises two arms 71, 72 substantially parallel, spaced from each other to form an opening 73 and interconnected by a proximal solid portion 74 forming the proximal portion of the shaped member fork, said portion 74 being connected by the connection zone 6 to the proximal portion 3 of the sleeve 2 of the knife. The fork shaped element 7 and the connecting region 6 may be made of one piece and the same material, such as plastic, for example identical to that used to form the sleeve 2 of the knife. The assembly of the z connecting one 6 and the proximal portion 3 is performed for example by a dovetail assembly as shown schematically in Figures 1 and 2. Alternatively, the shaped element fork 7, the connecting region 6 and the proximal portion 3 may be made of one piece. According to another variant, there may be provided a hinge pin between the portion 74 of the fork 7 and the lancet of the proximal portion 3, with a return coil spring mounted on the hinge pin or a spring interposed between the leaf the portion 74 and the proximal portion 3. the connecting region 6 serves as a hinge between the proximal portion 3 of the handle 2 and the fork-shaped element 7 to allow a spacing / relative approximation of the latter in the manner of two branches a dissecting forceps, by pivoting about an axis B perpendicular to said mean plane of the instrument and defined by the connecting region. The inherent elasticity of the material at the connection zone 6 will automat ically the elastic return outwardly from the proximal portion 3 in the position illustrated in Figure 1.

The free ends 75 of the branches 71, 72 opposed to the portion 74 of the fork 7-shaped member are connected to each other by a bridge of material 76 which serves as upper support abutment for the blade 8 . Each branch 71, 72 of the fork extends in a plane substantially parallel to the blade plane 8 of the knife and on either side thereof. When the blade 8 is in its pr otégée position shown in Figure 1, the legs have in projection perpendicular to the plane of the blade, an outer contour 77 which fully surrounds the cutting part 81 of the blade.

The branches 71, 72 each have on their outer side a flat face 79 to serve as a supporting surface for the thumb and middle finger of the hand of a user, and the distal portion 4 has on its upper edge 43 a flat portion 46 to serve as a bearing surface for the index finger of the user, when the user enters the knife 1 in the manner of a pen. The operation of the scalpel illustrated in Figures 1 and 2 will now be described.

In the passive position of the knife, as shown in Figure 1, the proximal portion 3 of the handle is resiliently spaced outwards and upwards by the elastic restoring force of the connection region 6. The two parts 3, 4 the handle are inclined with respect to one another and form between them an angle α of about 160 °, the angle α being turned towards the fork 7, and the free end 83 of the blade 8 is supported with its upper edge 82 against the bridge of material 76 forming a stop. In this passive position of the scalpel, the metal plate 5 is bending stress under the effect of the restoring force of the connection zone 6 which has a stiffness greater than that of said sipe 5 in the position shown in Figure 1 , the "springs" 5 and 6 are in stress balance. The blade 8 is in its shielded position, the cutting portion 81 laterally surrounded by the legs 71, 72 of the fork. Branches also overlap both in length and height of the cutting portion 81 of the blade 8. A releasable locking means could be provided for locking the knife in this passive position, as described below in two embodiments illustrated in figures 7 and 10.

When one wants to disengage the blade 8 of the branches 71, 72, the user applies a vertical pressure on the flat portion 46 of the distal portion 4 to move downwardly. The external pressure applied by the user drives simultaneously or successively via the slide 5, the pivoting of the proximal portion 3 inwardly and downwardly about the axis B, i.e. to the fork-shaped element 7 , opposing the elastic return force of the connection zone 6. accordingly, simultaneously or successively in the proximal portion 3 pivotal movement under the effect of the external pressure, the metal plate 5 made straighten the portion 4 distal relative to the proximal portion 3 about a virtual axis a perpendicular to the plane of blade 8 and substantially through the middle of the lamella 5, the upper edge 82 of the blade 8 sliding along the bridge of material forming a stop in support against an inner side thereof, until the slide is in its rest position, which corresponds to the active position of the scalpel and the working position of the blade illustrated in Figure 2, wherein the portion tell tale 4 is in abutment against a spacer 78 serving as a lower abutment end position. In the active position of the knife, the two portions 3, 4 of the handle form an angle β which corresponds to the plane position of the metal strip 5, the proximal portion 3 being partially inserted between the two arms of the fork. The end 74a of the connecting portion 74 opposite to the connecting zone 6 can be used to lower abutment end of the proximal portion 3 of the handle stroke.

Alternatively, the end 74a of the joining portion 74 extends to the point 78, to serve as a lower abutment instead of the spacer 78. In this case, the part 3 is guided in the proximal portion fork, and this irrespective of the type of elastic means between the parts 3 and 4.

These two simultaneous or successive pivotal movements according to the invention impart a longitudinal translation movement to the blade 8 with respect to the two arms 71, 72 so that the end 83 of the blade moves projecting from the free ends 75 branches connected by the bridge of material forming a stop. In the work position, only the cutting portion 81 of the blade is clear of the branches 71, 72 of the fork. The length l of the protrusion of the blade 8 can be chosen depending on the angle α between the two parts 3, four in the passive position of the scalpel.

For example, in the passive position of the knife, the two portions 3, 4 of the handle form an angle α of about 160 °, and the distance between the free ends 74, 75 of the arms and the axis of A pivot being substantially equal to the distance between said axis and the pivot axis B defined by the elastic connecting area 6. the angle β formed by the two parts of the sleeve in the active position of the knife is of the order 185 °. In this working position, the end of the blade protrudes about 4 mm relative to the free ends 75 of the branches, and the cutting portion 81 of the blade 8 is projecting over its entire length of about 2 millimeters with respect to the lower edges 77 of the two branches. According to specific embodiments, the α angle can be between 120 ° and 170 ° and the angle β between 170 and 190 °. If the user stops exerting pressure, the proximal portion 3 is pivoted outwards and up about the axis B under the effect of the elastic force of the connection zone 6, and simultaneously, both sides 3, 4 pivot relative to one another about the axis a to meet the metal blade of lower stiffness than that of the connection zone 6, until the knife returns to its passive position . Thus, if the knife 1 inadvertently escapes from the hand of the user, the blade 8 will be automatically returned to its protected position by the elastic restoring force of the connecting region. In this embodiment, the knife is in its active position when the metal plate 5 has reached its po sition substantially flat rest. It could of course be envisaged that the blade 8 is in its working position without the slide has reached its rest position. Furthermore, it can be provided that the sipe has a shape slightly curved at rest.

A lancet according to a second embodiment will now be described with reference to Figures 3 and 4. This embodiment differs from the first in that the two parts 3, 4 of the handle

2 are connected at their end edges 31, 41 vis-a-vis by a plastic strip 105 in longitudinal section having the general shape of a capital omega (Ω) and molded with parts

3 and 4, and defining a pivot axis A relative of the two parts which is arranged substantially perpendicularly to the mean plane of the blade 8. Each branch 151 of the omega is connected to the lower portion of the end edge 31, 41 of one of the parts 3, 4, substantially in the extension of the lower edge 32, 42 of said part, the concavity of the omega being oriented inwardly of the knife. In the passive position of the scalpel illustrated in Figure 3, the branches 151 of the omega are pressed against each other, the two parts 3, 4 of the handle is inclined with respect to one another of an angle α under the effect of the elastic return force exerted by the connecting region 6 of stiffness greater than that of the sipe in Ω. In the active position of the scalpel illustrated in Figure 4, the two arms 151 of the Ω are spaced from each other. The operation of the scalpel according to this second embodiment is substantially similar to that of the first embodiment. When the user applies on the distal part 4 a pressure which opposes the elastic return force exerted by the connection zone 6, the proximal part 3 pivots inwards and downwards about the axis B, and the distal portion 4 pivots simultaneously with respect to the proximal portion about the axis A, under the effect of this for biasing the resilient strip 105 in Ω.

In this embodiment, the two branches 72 of the fork-shaped element 7 are also connected by the spacer 78 serving as a lower stop to limit the distal portion 4. The spacer is disposed slightly downstream of the flat portion 46 in the longitudinal direction of the knife, between the free ends 75 and the portion 74, so that the lower edge 42 of the distal portion 4 abuts against the said spacer 78 when the sipe Ω 105 is in the active position the scalpel. This spacer 78 forming limit stop ensures that the blade 8 is stable in its working position, the distal portion being biased into abutment against the upper stop 76 at one end under the effect of pressure P exerted by the user on the side opposite to the spacer 78. Alternatively, spacer 78 could be arranged so that the distal portion 4 abuts against the spacer before the sipe omega ringworm only at its rest position.

In these first two embodiments described above, the lamellae 5, 105 are bending stresses by the restoring force of the connecting region 6 so as to bring the two ends of the sipe, and when this force is canceled by the external pressure exerted by the user, the strips tend to distance the ends of the coverslip.

In an alternative embodiment, the rest position of the slide 105 Ω corresponds to an angle between the two parts 3, 4 which is between the angle α of the passive position of the scalpel and the β angle of the active position the knife, so that the movement of the blade 8 of its shielded position to its working position is no longer continuously by simultaneous rotations around two axes A and B, but is divided at least in two stages. As before, the sipe Ω is bending stress in the passive position of the knife, the two arms of the Ω being biased in the close position to each other. Under the effect of an external pressure applied to the handle, in a first stage the proximal portion 3 is pivoted about the axis B until the lower edge 42 of the distal portion abuts against the spacer 78 . in a second step, the proximal portion continues to rotate about the axis B and the distal portion simultaneously pivots about the axis a in a direction such that the angle between the two parts increases. During this pivoting, the branches of the Ω are biased in the position spaced from each other and the distal part slides with its fulcrum against the spacer 78. This movement continues until the blade abuts with its upper edge against the upper stop 76.

A third embodiment will now be described with reference to Figures 5 and 6. In this embodiment, the two parts 4, 5 are connected to each other by two inverted V slats 205a, 205b disposed the one below the other and whose apexes are directed outwards and upwards, the side of the two portions 3, 4 of the handle opposite to the branches 71, 72 of the fork-shaped element 7 both strips 205a, 205b are thus connected in parallel. The edges of the two portions 3, 4 in vis-à-vis have a first inclined portion 231b and 241b extending from the upper edge 33, 43 of the shaft parts and a second portion extending from the lower edge 32 , 42. the junction between the two portions of the form support abutments 231a, 241a that define the axis A of pivoting of the two parts 3, 4 of the handle. The branches of a first upper lamina V 205a are connected to the first portions of the end edges, close to the edges formed by said first portions and the upper edges 33, 43 of the parts 3, 4. The branches a second lower lamina V 205b, smaller than the first size, are connected to the first portions of the edges, approximately midway between the support abutments 231a, 241a forming the axis A and the ends of the branches of the first lamina V 205a.

In the passive position of the scalpel illustrated in Figure 5, the two parts 3, 4 are inclined at an angle α and the end edges vis-à-vis the parts 3, 4 are pressed one against the other by their abutments and their second portions. The slats V 205a, 205b are bending stresses under the effect of the restoring force exerted by the connecting region 6 whose stiffness is greater than the combined stiffnesses of the two blades V, so as to move their respective limbs relative to their rest position. To move the lancet from its passive position to its active position, the user applies pressure to the distal portion 4 to oppose the rapp el elastic force exerted by the connecting area 6. The proximal portion 3 is pivoted to the within about the axis B and simultaneously under the effect of the restoring force of the lamellar V, the distal portion 4 pivots relative to the proximal portion 3 around the axis A defined by the abutments 231a, 241a bear one against the other, until the lamellar V reach their rest position, corresponding to the active position of the scalpel illustrated in Figure 6, wherein the blade 8 is in its working position.

In this embodiment, there is also provided a spacer 78 serving as a limit stop for the distal portion of the handle. Of course one slide inverted V could be provided.

In alternative embodiments, it could be provided slat V, of structure similar to those of the third embodiment, but disposed in opposite direction, so that their tops are oriented inwardly of the knife. In this case, the pivot axis A is defined by two abutments similar to the preceding, arranged above the slats, and the two arms of each lamella are compressed towards one another in the passive position of the scalpel. Similarly it could be provided in one lamella omega structure similar to that of the second embodiment, but disposed in opposite direction, the ends of the branches of the omega connected to the end edges of the handle portions in facing -vis the side of the upper edges of the parts, and the concavity of the omega being oriented outwardly. In this case, the slide was bending stress in the passive position of the knife, so that the legs of the omega are spaced apart from each other.

7 shows an alternative embodiment of the knife of Figures 3 and 4 in which the knife 1 is provided with a locking means for locking the knife in its passive position. The blocking means consists of a pin 9 carried by the proximal portion 3 of the handle 2 and pivotable around an axis substantially parallel to the aforementioned C A and B axes. The tab 9 is formed by a cut 93 formed at the lower edge 32 of the proximal portion 3 of the handle, so that the lug is connected to the proximal portion by a junction zone 92 of reduced thickness, can be deformed for allow rotation of the tab, and that the free end of the tab is arranged on the side of the sipe 105 Ω with respect to said joining zone. The tab is provided near its free end ow side opposite pads 91. A groove 711 is formed on the side wall of each branch 71 and 72 for receiving one of the studs 91. Each groove has a first circular portion 712 extending from the upper edge 710 of the branch in the direction of the connecting region 6 the knife. The first circular portion 712 is extended by a second vertical portion 713 which extends radially inward relative to the circular portion. The radius of curvature of the circular profile area portion 712 is substantially equal to the circle of the radius of curvature formed by the pads 91a at the pivot pin 9 about its axis C. In the passive position of the knife, the distance between the axis C and the inlet of the groove 711 is greater than the distance between the axis C and the studs 91. to block the knife in its passive position, the user exerts light pressure on the handle to bring the proximal portion 3 of branches 71 and 72, as shown in Figure 7, and rotates the leg 9 about the axis C to bring the pads 91 in the circular portions 712. the user then moves the studs in the circular grooves until that said studs are engaged in the vertical portions 713 under the effect of elastic return of the link 6. this particular configuration of the grooves allows a bayonet effect of ensuring a scalpel in its locking position the fourth pass. To release the lancet from its passive position, the user exerts pressure on the proximal portion 3 for disengaging the pads of the vertical part s 713 and then rotates the leg 9 to output pads of the circular portions 712 of the grooves. In an alternative embodiment, the distance between the axis C and the inlet of the groove in the passive position of the knife is less than the distance between the axis C and the pads, the pads come in this case be positioned in abutment in a vertical portion of the groove extending radially outwardly relative to the circular portion. In another embodiment, the locking means locking / releasing mechanism comprises a tab which the studs are adapted to be engaged in circular grooves having an intermediate region of shrinkage to ensure a snap effect of the paw. Although, of course, the aforementioned locking tabs could be provided on the distal portion of the handle. In another alternative, there may be provided a tab on one of the arms and slots or grooves on the proximal portion or the distal portion of the handle.

Figures 8 to 11 illustrate another of the knife embodiment with a Ω lamella shown in Figures 3 and 4. In this embodiment, the distal portion 104 of sleeve 102 has on its upper edge 143 a platen 109. The platen 109 is disposed pe endiculairement the blade plane 8 and extends over a portion 191 called free, beyond the distal end 148 of the distal portion. The free portion 191 is extended at its end 192 by a point 193. When the blade is installed on the distal portion of the handle by latching or welding on the lug 145, the free portion 191 and the tip 193 are arranged vertically and away from top edge 82 of the blade, the tip being further back from the distal end 83 of the blade as shown in Figure 9. as seen in FIG 11, the two parts 103, 104 of the sleeve are substantially aligned es when the knife is its active position. This embodiment differs further from the embodiment of Figures 3 and 4 in that the flat part 146 serving as a bearing surface is integral with the proximal portion 103 of the handle and comes into cantilevered vertically of the sipe in Ω. Furthermore, full proximal portion 174 connecting the two branches of the fork 107 extends between the two branches 171, 172 forming a housing 174b against the bottom of which the bottom 132 of the proximal portion of the handle edge bears in the active position of the knife 101. the lower edge 142 of the distal portion 104 further includes a rounded protuberance 147 adapted to abut against the bottom of said housing. The scalpel may be made in one piece, for example a plastics material such as polypropylene (PP) or transparent acrylonitrile-butadiene-styrene (ABS) transparent.

10 illustrates the knife 101 locked in its passive position. The tip 193 of the plate abuts against the underside of the upper abutment 176 and the end 192 of the free portion 191 abuts against the upper edges 171a, 172a of the legs. To release the knife, the user rotates the proximal portion 103 of the handle outwardly meeting of the sipe in Ω and the resilient connecting region 106, by applying a force on the distal portion or the proximal portion of the handle , to release the tip of the upper stop 176. once the exposed tip of the upper stop, the distal portion 104 pivots under the effect of the sipe Ω until the blade 8 abuts with its upper edge 82 against the upper stop. When the user then releases the above-mentioned strength, the tip 193 is positioned above the upper stop 176 against the upper face of the latter. In this unlocked position, the upper stop 176 is positioned between the blade 8 and the platen 109. In order to bring the blade into its positon of work, the user applies as previously vertical pressure on the flat surface 146 to permit a relative approximation of the handle 102 and the isolation means 107, like the branches of a dissecting forceps, by pivoting about the two axes a and B arranged perpendicular to the blade plane 8. at this passage in the working position the upper stop 176 slides between the blade and the plate, the free portion 191 of this latter is elastically deformed outwardly, as shown in Figure 11. the plate ensures a continuous movement of the knife between its two positions. The plate thus fulfills both a blocking function and a guiding function. In an alternative embodiment, the plate may be used in combination with a locking means constituted by a tab 9 as described above in connection with Figure 7, the plate in this case being used as an guide means.

In the different illustrated embodiments, the two parts 3, 4 of the handle of the scalpel are connected by an elastic connecting means 5, 105 or 205. There may be provided a non-elastic linking means consist of a simple joint permitting pivotal on the two parts relative to each other about an axis A. in this case, the displacement of the blade from its shielded position to its working position is divided into two stages. Indeed, an external pressure exerted on the distal portion would result in a first time a first pivot of the proximal part 4 and the part di stale with respect to the axis B, the blade away from the stop formed by the bridge material 76 and the remaining substantially unchanged angle. Then, when the distal portion 3 abuts with its lower edge against the stop formed by the spacer 78, the first pivot is complemented by a second pivoting of the two parts around the axis A, until the end of the blade comes to bear with its upper edge against the bridge of material 76. for reasons of safety and ease of USE, the embodiments in which the blade performs a continuous movement are preferred. Furthermore, the elastic connecting means 5, 105 and 205 described above, which fulfill both the function of articulation between the two parts and the spring function, could be replaced by a simple hinge and a separate spring acting on said joint.

It is clear to the skilled person that the invention is not limited to a scalpel, but can apply to any other cutting element, in fields other than medicine. It is also clear that the invention is neither limited to the shape or the structure of the devices illustrated, any other shape or structure to achieve the same functions within the scope of the present invention.

While the invention has been described in connection with three particular embodiments, it is obvious that it is not limited and it includes all the technical equivalents of the means described and their combinations if they within the scope of the invention.

For this purpose, the resilient connecting means connecting the parts 3 and 4 can take many forms, the three embodiments described hereinbefore which are not data to be limited to, any other variant the same function within the scope of 'invention.

Claims

1. An integrated protection for a cutting tool, comprising
- insulation means (7, 107) for isolating from the outside at least the cutting portion (81) of a blade (8) for forming the distal portion of the cutting tool, this isolation means having an opening (73) for the passage of said blade between a protected position wherein said isolation means at least partially surrounds said blade, and a working position wherein the blade is disengaged from said isolation means,
- a handle (2, 102) for forming the proximal portion of the cutting tool and connected to said insulating means by a first connecting means (6, 106) elastic allowing relative movement of the handle relative to said means of isolation between a passive position wherein said blade is biased in the shielded position and an active position under the effect of external pressure opposing the biasing force of the first connecting means, wherein the blade is in the working position, characterized in that
- the handle (2, 102) of the cutting tool comprises two parts (3, 4; 103, 104) connected by a second connecting means (5,
105, 205a, 205b), a proximal portion (3, 103) connected to said insulating means (7, 107) by said first elastic coupling (6) and pivotable relative to said isolation means and a portion distal (4, 104) for carrying said blade (8), - said isolation means comprising an upper stop means (76, 176) against which is adapted to abut the blade both in protected position as working ,
- said second connecting means permitting relative pivoting of the two parts (3 4, 103, 104) of the handle between the passive position of the handle, wherein the two parts are inclined with respect to each other a angle α, and the active position of the handle in which the two handle portions are disposed at an angle β greater than the aforementioned angle α.
2. A protective device according to claim 1, characterized in that the insulating means (7, 107) comprises a lower stop means (78, 174b) downstream of the point of support of the external pressure on the handle (2, 102), against which lower stop means is intended to abut the distal portion (4, 104) in the working position of the blade.
3. A protective device according to claim 2, characterized in that the second connecting means (5, 105, 205a,
205b) is an elastic means, stiffness smaller than the first means of elastic connection, said second connection means being biased into the passive handle position (2, 102) so that the handle moving between its two positions s is effected by pivoting of both the proximal portion (3, 103) relative to said insulating means (7, 107) and the distal portion (4, 104) relative to the proximal portion.
4. Protective device according claim 1 to 3, characterized in that said second connecting means (5, 105, 205a, 205b) is biased by the elastic restoring force of the first connecting means (6,106) in the position passive of the handle, so as to incline the two handle portions and generate a torque on the two parts (3, 4; 103, 104) of the handle with respect to a pivot axis (a) between said handle portions to pivot the two parts about said pivot axis (A) lo rsque said external pressure applied to the sleeve is opposed to the elastic restoring force of the first connecting means (6, 106).
5. A protective device according to claim 4, characterized in that said second resilient connection means (1 05) comprises a slide having in a longitudinal plane parallel to the blade the general shape of a capital omega (Ω) of which end of each leg (151) is fixed to the end face-vis each (31, 41) of the two portions (3, 4; 103, 104) of the handle, the two branches of the omega s 'away from one another during the handle displacement towards its active position.
6. A protective device according to claim 4, characterized in that said second connecting means (5) comprises at least a resilient substantially flat strip, each end of which is fixed to the end vis-à-vis each of two parts (3, 4) of the handle, said blade being deformed in flexion in the passive position of the handle and substantially planar in the active posi tion of the handle.
7. Protective device according to claim 4, characterized bythe fact that the ends (231, 241) of the two parts (3, 4) of the handle vis-à-vis abut one against the other by surfaces support (231a, 241a) defining the pivot axis (A) on the two handle portions.
8. Protective device according to claim 7, characterized in that said second elastic connecting means comprises at least one blade (205a, 205b) having a longitudinal plane parallel to the blade the shape of an inverted V with the apex is outwardly directed and each end is attached to the end vis-à-vis (231, 241) of each of two handle portions, the two branches of the V being biased in posi tion spaced from one each other in the passive position of the handle and towards each other upon handle movement towards its active position, the support surfaces (231a, 241a) of the two portions being disposed towards the opposite lamella at the top.
9. Protective device according to one of the preceding claims, characterized in that the insulating means (7, 107) comprises a generally fork-shaped member (7, 107) whose branches (71, 72; 171 , 172) defining said opening (73) for the passage of the blade (8) of the cutting tool, the free ends (75) of the fork being linked by a bridge of material (76, 176) constituting said abutment means higher for the end of the blade.
10. A protective device according to claim 9, characterized in that each branch (71, 72; 171, 172) of the fork (7, 107) extends in a plane substantially parallel to the blade plane and has a contour which is at least circumscribes the contour of the blade in the protected position.
11. A protective device according to claim 2 in combination with one of claims 9 and 10, characterized in that the two legs (71, 72, 171, 172) of the fork are connected by a proximal portion ( 74, 174) extending from the first elastic connection means (6) so that its free end serves as a lower stop means (78).
12. A protective device according to claim 11, characterized in that the handle, for example the proximal portion (3, 103) thereof, has on its outer upper face a flat part (45, 145) serving as a surface of support the user's index finger for exerting said external pressure, said flat being situated generally upstream of the lower stop means (78).
13. Device according to one of claims 1 to 12, characterized in that it comprises a lockable locking means / unlocked from the handle (2) in its passive position, said means comprising a tab (9) mounted on the one of the elements constituted by the sleeve and the insulation means (7), a deformable junction zone (92) permitting rotation of said tab which is provided with at least one stud (91) at its free end, said stud being adapted to be engaged upon rotation of the lug in a groove (711) provided on the other of said elements.
14. Device according to one of claims 1 to 13, characterized in that the distal portion (104) of the door handle on its upper edge (143) disposed a platinum peφendiculairement the plane of the blade and extending beyond the distal end (148) of said distal portion, said platen being adapted to come into abutment via its bottom face against the upper stop means (176) for guiding movement of the sleeve during its movement between its passive position and its active position.
15. Device according to claim 14, characterized in that the distal end (192) of the plate (109) is provided with a tip (193) adapted to be engaged in the opening (73) of moye d insulation and support below the upper stop means (176) for locking the handle in its passive position.
16. A cutting tool, such as a scalpel, characterized in that it comprises a protection device according to one of claims 1 to 15, and a blade (8) mounted on the distal portion of the handle so that the blade plane is disposed perpendicular to an axis (a, B) of pivoting handle (2, 102).
PCT/FR2003/000544 2002-02-22 2003-02-19 Cutting tool and integrated protective device therefor WO2003070116A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR02/02297 2002-02-22
FR0202297A FR2836410B1 (en) 2002-02-22 2002-02-22 Cutting tool and protective device integrated for this cutting tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030718895 EP1478285A1 (en) 2002-02-22 2003-02-19 Cutting tool and integrated protective device therefor

Publications (1)

Publication Number Publication Date
WO2003070116A1 true true WO2003070116A1 (en) 2003-08-28

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PCT/FR2003/000544 WO2003070116A1 (en) 2002-02-22 2003-02-19 Cutting tool and integrated protective device therefor

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EP (1) EP1478285A1 (en)
FR (1) FR2836410B1 (en)
WO (1) WO2003070116A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008041103A2 (en) * 2006-10-06 2008-04-10 Trevor John Milton Scalpel with transparent plastic blade carrier, handle, or both
US7652027B2 (en) 2004-06-11 2010-01-26 National Health Research Institutes Phenanthroindolizidine alkaloids

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5377413A (en) 1991-08-19 1995-01-03 Masse; Joseph H. Retracting cutter
WO1997037599A1 (en) * 1996-04-08 1997-10-16 Bloom, Leonard Disposable guarded finger scalpel for inserting a line in a patient and blade therefor
WO1999009898A1 (en) 1997-08-25 1999-03-04 Mosseri Raphael Device for protecting a cutting and/or drilling tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5377413A (en) 1991-08-19 1995-01-03 Masse; Joseph H. Retracting cutter
WO1997037599A1 (en) * 1996-04-08 1997-10-16 Bloom, Leonard Disposable guarded finger scalpel for inserting a line in a patient and blade therefor
WO1999009898A1 (en) 1997-08-25 1999-03-04 Mosseri Raphael Device for protecting a cutting and/or drilling tool
US6261265B1 (en) * 1997-08-25 2001-07-17 Raphael Mosseri Device for protecting a cutting and/or drilling tool

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7652027B2 (en) 2004-06-11 2010-01-26 National Health Research Institutes Phenanthroindolizidine alkaloids
WO2008041103A2 (en) * 2006-10-06 2008-04-10 Trevor John Milton Scalpel with transparent plastic blade carrier, handle, or both
WO2008041103A3 (en) * 2006-10-06 2008-08-28 Trevor John Milton Scalpel with transparent plastic blade carrier, handle, or both

Also Published As

Publication number Publication date Type
FR2836410B1 (en) 2004-08-13 grant
EP1478285A1 (en) 2004-11-24 application
FR2836410A1 (en) 2003-08-29 application

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