WO1990014116A2

WO1990014116A2 - Protective device for cannulas

Info

Publication number: WO1990014116A2
Application number: PCT/EP1990/000827
Authority: WO
Inventors: Konrad Minninger; David Tang; Rainer Oberhagemann
Original assignee: Konrad Minninger
Priority date: 1989-05-23
Filing date: 1990-05-22
Publication date: 1990-11-29
Also published as: AU5669090A; WO1990014116A3

Abstract

A protective device designed to prevent injury to medical personnel when replacing a cannula cap on a used injection cannula comprises a support (336) with a straight channel (354) which receives the cannula cap. The channel (354) is arranged at the bottom of a depression and is surrounded by a smooth surface (353) which cannot be pierced by the cannula. The surface (353) is essentially wider than the cross-section of the channel (354). An interchangeable saw (366) is arranged on the support (336). The support (336) is a plastic injection moulding in the form of a hollow cube made from resistant material which is cast with a casting compound. Cylindrical depressions are made in the casting compound.

Description

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Technical area

The invention relates to a protective device for avoiding injuries when replacing a cannula protector on a used cannula for medical syringes, with a holding body with a bore designed to receive the cannula protector.

Underlying state of the art

Medical syringes contain a cylinder which is open at one end and in which a plunger is guided. At the closed end of the cylinder, the nozzle is formed with a hole. A cannula head, which carries a cannula, is placed on this nozzle. The bore of the cannula is connected to the cylinder via the nozzle and the cannula head.

The cannula is housed in a cannula protector before use. This is a tube closed on one side, in which the cannula is seated, the cannula head being held in the open end of the tube and sealing off this tube. To use the cannula, the cannula with the cannula protector is placed on the nozzle of the syringe by means of the cannula head. The cannula protector is then removed. The syringe is now ready for use.

After using the syringe and cannula, the cannula is reinserted into the cannula protector and pulled out of the syringe with it. The opening of the cannula protector is naturally very narrow. It therefore requires great attention and a steady hand to reinsert the cannula into the cannula protector. There is a considerable risk that the user will miss the opening of the cannula protector and stick his finger. A puncture with a used cannula naturally entails a considerable risk of infection. Protective gloves are also of no use because the cannula sticks through such protective gloves.

A protective device is known with a plastic holding body with a bore designed to receive the cannula protector. The holding body is a plastic injection molded part with a bowl-shaped base, from which a molded tube piece protrudes upwards. The bowl-shaped base has a large diameter compared to the pipe section. At the top end, the pipe section forms a shell. On the base of this shell, a channel of rectangular cross-section narrowed with respect to the inner diameter of the tube piece is provided, into which a cannula guard of a corresponding cross-section can be inserted. The shell forms an edge around the channel, the width of which corresponds approximately to the diagonal of the channel. This is to unscrew the cannula from the syringe, e.g. after taking a blood sample.

This edge is too narrow to reliably rule out an injury when the protective device is held in the hand. The protection device must therefore be on a table. However, it is too light for a stable stand.

The known protective device is made of a material that does not allow thermal sterilization. The material is also relatively soft. It is therefore possible that the user misses the cannula protector and into the material sticks in. Such a contaminated puncture site is practically impossible to sterilize. However, the user can easily touch the contaminated, unsterilized or poorly sterilized surface around the bore with the finger and thereby become infected.

DE-U-G8 711 864.5 relates to a device made of plastic for receiving a cannula protective cap with a foot part and a receiving part. The receiving part has a receiving opening for receiving the cannula protective cap. The receiving part is removably inserted into a corresponding recess in the foot part. The receiving opening has a circular cross section and tapers inwards. The foot part can be attached to a table by a suction cup or the like.

US-A-4 737 149 describes a rubber-elastic protective device which engages a cannula protective cap. The protective device contains a rubber-elastic, ring-shaped protective surface which is provided with a rubber-elastic, tubular handle arranged on one side thereof. By means of the rubber-elastic handle, the protective cap can be gripped by pressing the handle together and pulled off or put on.

Disclosure of the invention

The object of the innovation is to avoid the risk of injuries to a used cannula when the cannula is reinserted into the cannula protector by means of a cannula protector, the cannula protector being easy to sterilize.

According to the innovation, this object is achieved in that (a) the channel is surrounded by a smooth surface which is resistant to piercing the cannula and

(b) the surface around the channel forms an edge which is substantially wider than the cross-sectional dimensions of the channel.

The user then does not have to hold the cannula protector in his hand when reinserting the used cannula. The cannula protector rather sits in a holding body. The user can hold this holding body in his hand. Due to the size of the surface that is formed around the bore, the gripping surface where the user engages on the holding body is in a secure position so that the user cannot prick the cannula even if the opening of the cannula guard is missed. Due to the smooth and resistant surface, the cannula cannot pierce blind holes that are difficult to sterilize.

A raised edge can be formed between the bore and the gripping surface. Such an edge protects the hand of the user if, when the opening of the cannula protector is missed, the cannula slides off the surface of the holding body and slips to the side. However, the channel is advantageously provided on the base of a depression formed in the holding body. The depression can continuously narrow towards the channel. It is then ensured that the surface parts of the holding body, which can come into contact with the contaminated cannula, are set back so that they cannot accidentally come into contact with the hand of the user during subsequent handling of the holding body. The depth of the channel is expediently significantly less than the length of the cannula protector. In this way, the cannula protector protrudes beyond the surface of the depression and can be pulled out without the user having to touch the possibly contaminated surface of the depression. Furthermore, the holding body can be retracted in the area of the grip surface. The user's fingers on the gripping surface are then additionally protected by the protruding parts of the holding body.

In a preferred embodiment of the innovation, the holding body is a rotating body with an axis, at least one end face and a lateral surface. A depression is formed in the end face, which narrows steadily towards the axis. At the bottom of the depression, the channel set up for receiving the cannula protector is attached along the axis. The outer surface is drawn in opposite to the edge of the end face to form the grip surface.

The holding body advantageously also consists of a temperature-resistant, sterilizable material with a smooth surface.

In order to ensure better sterilizability of the holding body, the channel can extend continuously through the entire holding body. Then no inaccessible spaces are formed. For the same reason, it can be advantageous if radial transverse bores open in the channel and start from the lateral surface of the holding body.

Another advantageous solution is that the surface of the recess is formed by an insert which is exchangeably held in the holding body. It is then not necessary to close the entire holding body each time sterilize. The insert can consist of an easily sterilizable material, for example stainless steel. Then only the insert is sterilized. A particularly advantageous construction of this type is that the holding body has a recess which is open on one side. The insert is formed by a shell which can be pushed into the depression from this side and which has an opening on its base which, when inserted, is flush with the channel. A guide is provided on the holding body, which guides the insert in the direction of insertion and secures it perpendicularly thereto. The guide is formed by a groove along the circumference of the depression provided in the holding body and open to one side, which runs at a distance from the upper edge of this depression. A projecting ledge is provided on the insert, which leads in the groove. An edge is formed on the insert, which covers the inner wall of the depression between the groove and the upper edge. A lateral handle can be attached to the insert, by means of which the insert can be pulled out of the recess of the holding body without touching the inner surface of the insert.

Another embodiment is that the holding body is funnel-shaped with a conical upper part and an adjoining tubular lower part, the lower part forming the channel

Includes the cannula protector, the holding body one

A plurality of radial, regularly arranged radial ribs extending between the outer surface of the upper part and the outer surface of the lower part and the

Ribs with the face of the lower part one

Form stand space. The holding body can consist of porcelain. Another construction provides that the holding body has integrally formed locking members which are arranged at a large distance from the channel in relation to the cross-sectional dimensions of the channel in such a way that they prevent unintentional contact with the surface surrounding the channel. A preferred embodiment of this type is characterized in that the holding body has a base with said surface and the channel and projections are formed on the base around the channel, which protrude axially beyond the surface and form locking members. It is advantageous if the surface forms a flat surface of a square basic shape, in the center of which the channel is attached, the lugs are arranged in the corners of the square determined by said surface and form radial ribs, the distance between adjacent inner edges of the ribs access to the surface is difficult for the fingers of the user, and the base and the ribs form a standing surface on the side facing away from the surface. Finally, a construction can be realized in which the holding body is formed by a cuboid block, in at least one side surface of the block a funnel-shaped depression is formed, which forms said surface and the channel extends through the block.

In this case, a funnel-shaped depression can be formed in each of two adjacent side surfaces of the block and the associated channels crossing through the block intersect. The holding body can consist of mela resin.

Another possibility is that the holding body is formed by two shells arranged back to back, which are connected on their base through the channel. The holding body can be coil-like with the two through one tubular section connected shells, wherein the tubular section forms said channel. But it is also possible that the holding body in its basic form is a rotating body with a toric, drawn-in outer surface, cup-shaped depressions are formed in the opposite end faces of the holding body and the bowl-shaped depressions are connected on their base by the channel.

In these cases, the holding body can be made of glass.

The channel expediently has a rectangular or oval cross section.

In order to enable adaptation to different cross sections of the cannula protector, the holding body can contain a base body with a receiving opening, into which inserts with channels of different cross-sectional shapes can be used to adapt to the different forms of cannula protector.

This can be done in different ways. One possibility is that the base body is a hollow body open on one end face and the inserts have shell-shaped parts which close off the open end face of the hollow body and run out in a central shaft forming the channel. Another possibility is that the base body is a hollow body open on opposite end faces and the inserts have back-to-back shell-shaped parts which are connected to one another via a central middle part forming the channel. The base body can be cuboid. However, the base body can also be a rotary body with a lateral surface drawn in in the middle. Even in the two-part design of the holding body, the base body can have integrally formed locking members which are arranged at a large distance from the receiving opening from the cross-sectional dimensions of the channel in such a way that they prevent unintentional contact with the surface surrounding the channel.

The structure can be such that the base body has a base with said receiving opening in a surface thereof and projections are formed on the base around the receiving opening, which protrude axially beyond the surface of the base and form locking members. It is then expedient if the receiving opening is a depression with a non-rotatable cross section and the inserts have prismatic parts which can be fitted into the receiving opening and have the channels. Said surface of the base can be concave. It is advantageous if the surface of the base and surfaces of the lugs lie on an imaginary, concave surface of revolution and the inserts around the channels have shell-shaped parts, the outer surface of which is complementary to said surface of rotation and which are on the surface of the base and said Surface of the approaches lie on.

Another basic structure of a two-part holding body is that the base body has a base plate, from the edge of which locking members protrude parallel columns and a non-rotatable receiving opening is formed centrally between the columns and the inserts have a disk-shaped or bowl-shaped upper part and a shaft with a channel attached thereto and having an outer contour adapted to the receiving opening, the shaft sitting in the receiving opening and the Upper part is guided between the columns. The receiving opening can be formed by a flat depression in the base plate. However, the receiving opening can also be formed by a flat base which is integrally formed on the base plate.

Radial stiffening ribs can be provided between the underside of the upper part and the shaft.

Embodiments of the innovation are explained in more detail below with reference to the accompanying drawings.

Brief description of the drawings

Fig. 1 shows a longitudinal section through a holding body with a cannula guard and a syringe with a cannula.

Fig. 2 shows a modified version of the

Holding body.

Fig. 3 shows a holding body with an insert in a longitudinal section along the line III-III of Fig.4.

Fig. 4 shows a section along the line IV-IV of Fig.3.

Fig. 5 shows a side view of the insert as it is inserted into the holding body of Fig. 4.

Fig. 6 is a perspective view of another embodiment of a holding body. Fig. 7 shows a further embodiment of a holding body.

8 shows an embodiment of a holding body in the form of a plastic block.

Fig. 9 shows a holding body made of glass and

10 shows another embodiment of a holding body made of glass.

Fig.11 shows in vertical section an embodiment with a two-part, cube-shaped holding body.

12 shows a plan view of the holding body from FIG. 11.

Fig. 13 shows in vertical section a further embodiment with a two-part holding body, similar to that of Fig. 11.

Fig. 14 shows in vertical section similar to Fig. 13 a two-part holding body that can be used on both sides.

15 shows a top view of a further embodiment of a two-part holding body.

Fig. 16 shows a section along the line XVI-XVI of Fig. 15.

Fig. 17 shows a modified embodiment of a two-part holding body in a section similar fig. 1 6.

Fig. 18 shows a further embodiment of a two-part holding body in a section along the line XVIII-XVIII of Fig. 19.

FIG. 19 shows a plan view of the two-part holding body from FIG. 18.

Fig. 20 shows various inserts with a square outer cross section and different cross sections of the channel.

Fig. 21 shows various inserts with an oval outer cross section and different ones

Cross sections of the canal.

Fig. 22 shows a section through a holding body along the line 22-22 of Fig. 23. Fig. 23 shows a top view of the holding body of

Fig. 22.

Fig. 24 shows a view of the holding body seen from below in Fig. 22.

25 shows a plan view of another embodiment of a holding body.

Fig. 26 shows a section through the holding body along the line 26-26 of Fig. 25.

Fig. 27 shows a view of the holding body seen from below in Fig. 26.

Preferred embodiment of the invention 1 shows a longitudinal section of a protective device to avoid injuries when reinserting a cannula protector onto a used cannula in medical syringes, to clarify the mode of action with an inserted cannula protector and a syringe with a cannula.

The protective device consists of a holding body 10 made of a temperature-resistant, easily sterilizable

Material with a smooth surface, e.g. stainless steel.

The holding body 10 is a rotating body with an upper end face 12 and a lower end face 14.

The end faces 12 and 14 are connected by a lateral surface 16.

The upper end face 12 forms a depression 18, which becomes narrower towards the axis 20 of the rotating body. A channel 22 is formed on the base of the depression 18 along the axis 20. The channel 22 is designed to receive and hold a cannula protector 24. This means that the dimensions of the channel 22 are equal to or slightly larger than the outer dimensions of the cannula protector and the length of the channel 22 is somewhat smaller than the length of the cannula protector, so that the cannula protector 24 is held in the channel 22 with a slight jamming. A protruding edge 26 is formed on the end face 12 on the holding body 10 around the recess 18.

The outer surface 16 is drawn in the middle, so that the holding body 10 is approximately coil-shaped. A grip surface 28 is formed in the retracted area. The holding body 10 is held on this gripping surface 28 when a cannula 30, as shown, is inserted into the cannula protection 24 seated in the holding body 10 shall be.

The lower end face 14 is flat. With this end face 14, the holding body 10 can be placed on a table.

The syringe 32 contains a cylinder 34 and a piston 36. A central connector 38 sits on the end face of the cylinder 34. The cannula 30 with its cannula head 40 is placed on this connector 38. The cannula head 40 has a radially projecting edge 42. This edge 42 makes it easier to pull the cannula out of the cannula protector 24 before using the cannula 30 and to pull the cannula head 40 off the syringe 32 after use.

The depth of the channel 22 is significantly less than the length of the cannula protector 24. The cannula protector 24 therefore protrudes a little above the surface of the recess 18. After inserting the cannula 30, there is also the cannula head 40. Therefore, the cannula protector 24 with the cannula 30 and the cannula head 40 can be pulled out of the channel 22 at the edge 42 of the cannula head 40 without the user closing the surface of the recess 18 needs to touch. The depression and possibly the edge 42 of the cannula head 40 can be shaped such that the middle regions of the depression 18 in which contamination with the cannula is most likely cannot be touched by the user when the cannula protector 24 is pulled out.

2 shows a holding body 10, which is constructed similarly to the holding body of FIG. 1. Corresponding parts are identified in FIG. 2 with the same reference symbols as in FIG. 1. In the embodiment according to FIG. 2, the bore 44 goes straight through the holding body 10 from the upper end face 12 to the lower end face 14. Furthermore, radial bores 46 are provided in the holding body 10, which start from the outer surface 16 and in the channel 44 flow out. In this way, dead spaces that are difficult to access and that are difficult to sterilize are avoided. The radial bores can also be provided in an arrangement according to FIG. 1 with the channel 22 designed as a blind hole.

3 to 5, a separate insert 48 is provided, which forms the inner surface of the recess 50.

The actual holding body 52 is configured similarly to the holding body 10 of FIGS. 1 and 2. The holding body 52 has an upper end face 54, a lower end face 56 and a lateral surface 58. The lateral surface 58 is drawn in in the middle and forms a gripping surface 60.

A recess 62 is formed in the end face 54 of the holding body. The recess 52 is formed on the left half in FIG. The inner surface of the recess 62 forms a surface of revolution there. On the right half in Fig. 4 the depression is prismatic and open on the right side in Fig. 4. A central channel 64 similar to channel 22 from FIG. 1 is provided in the holding body 52 at the bottom of the depression 60. The recess 62 forms a circumferential upstanding edge 66. A groove 70 is formed between the edge 66 and the bowl-shaped part of the surface of the recess 62, that is to say at a distance from the upper edge 68 of the recess. The groove 70 runs along the entire edge of the recess 62.

The insert 48 can be inserted into this recess 62 from the right in FIG. The use is shown in Fig. 5 by itself. The insert 48 is bowl-shaped and essentially rotationally symmetrical. The outer surface of the insert 48 is complementary to the inner surface of the recess 62 on the left half in FIG. The insert 48 has a strip 74 running along its edge 72 but at a distance from it. The strip 74 leads in the direction of insertion, in the groove 70. In the direction perpendicular thereto, vertically in FIGS. 3 and 4, the insert is secured by the guide. The insert 48 is thereby held securely and is secured against slipping and falling out. The insert 48 also forms an edge 76 which covers the edge 66 of the inner wall of the depression 62 between the groove 70 and the upper edge 68.

The insert 48 has an opening 768 on its base, which is aligned with the channel 64. The strip 74 forms a handle or a tongue 80 on the right-hand side in FIG. 5, by means of which the insert 48 can be pulled out of the recess 62 of the holding body 52 after use. The user therefore does not need to come into contact with the potentially infectious inner surface of the insert 48 when pulling out the insert.

The insert 48 can be made from easily sterilizable material such as stainless steel. The holding body 52 then need not be made of this material. It is usually not necessary to sterilize the holder body. The holding body 52 then becomes cheaper and lighter. The insert can be sterilized more easily than the holding body 52. In all the embodiments described, it is important that the surface around the channel is smooth and made of such a material that the cannula cannot be pierced into the surface.

In the embodiment according to FIG. 6, the holding body 82 is funnel-shaped with a conical upper part 84 and an adjoining tubular lower part 86. The lower part 86 contains the channel 88 for receiving the cannula protection. The holding body 82 has three radial ribs 90, 92, 94. The ribs are arranged regularly, i.e. each offset by 120 ° around the axis of the lower part 86. The radial ribs 90, 92 and 94 extend between the outer surface 96 of the upper part 84 and the outer surface 98 of the lower part 86. The ribs 90, 92 and 94 form a standing surface 100 with the end face of the lower part 86. The entire holding body 82 is made of porcelain . Porcelain has a smooth and hard surface. Therefore, the cannula cannot pierce the surface of the holding body 82 if the cannula should fail to protect the cannula. The porcelain with the smooth, invulnerable surface is easy to sterilize.

The upper part 84 has a conical depression leading to the channel 88, which forms a conical annular surface 102. This conical ring surface 102 forms a smooth surface that is resistant to piercing the cannula around the bore 88. This conical ring surface 102 forms an edge which is substantially wider than the diameter of the bore. Injury to the user from the cannula is therefore also ruled out if the user holds the holding body 82 in his hand when the cannula is inserted into the cannula protector held in the bore 88. 7 shows a holding body 104 which has integrally formed locking members 106, 108, 110 and 112. The integrally formed locking members 106, 108, 110 and 112 are arranged in a bore 114 which is provided for the diameter of the cannula protection in such a way that they prevent accidental contact with the surface 116 surrounding the channel 114. For this purpose, the holding body 104 has a base 118 with the said surface 116 and the channel 114. Radial lugs are formed on the base 118 around the channel 114, which project axially upward in FIG. 7 beyond the surface 116 and form the locking members 106, 108, 110 and 112. In this embodiment, the surface 116 is a flat surface of a square basic shape. The channel 114 is arranged in the center of this square plane surface. The lugs are arranged in the corners of the square defined by surface 116. The approaches form radial ribs. The distance between adjacent inner edges 120, 122 of the ribs makes access to surface 116 more difficult for the user's fingers. The base 118 forms a standing surface 124 on the side facing away from the surface 116.

In the embodiment according to FIG. 8, the holding body 126 is formed by a cuboid block 128. A funnel-shaped depression 132 is formed in a first side surface 130 of this block 128. A channel 134 extends through block 128. Channel 134 can accommodate cannula protection during operation. The funnel-shaped depression 132 forms the surface which surrounds the channel 134. A second funnel-shaped depression 140 is formed in a side surface 138 of the block 128 which is adjacent to the side surface 130. A channel 142 extends from the base of this funnel-shaped depression 140. The channel 142 is also for receiving one Cannula protection set up. The channel 142 also passes through the block 128 perpendicular to the side surface 138 and thereby crosses the channel 134. The holding body 126 in this exemplary embodiment consists of a synthetic resin, such as melamine resin.

Instead of in two adjacent side surfaces as in FIG. 8, the funnel-shaped depressions can also be formed in opposite surfaces of a cuboid block. These depressions are then connected to one another by a single straight channel. The cuboid block can consist of a material whose surface can be deformed by the action of light using a laser while maintaining the sterilizability.

In the embodiment according to FIG. 9, the holding body 144 is formed by two shells 146 and 148 arranged back to back. The bottom of the two shells 146 and 148 are connected by a bore 150. The bore 150 is set up to receive a cuvette protector. In the embodiment according to FIG. 9, the holding body 144 is designed like a coil. The two shells 146 and 148 are connected by a tubular section 152. The tubular section 152 includes the bore 150.

In the embodiment according to FIG. 10, the holding body 154 in its basic form is a rotating body with a toroidally drawn-in outer surface. Shell-like depressions 162 and 164 are formed in the opposite end faces 158 and 160 of the holding body 154. At their bottom, the shell-like depressions 162 and 164 are connected by a channel 166.

In the embodiment according to Fig. 9 and 10 there is Holding body 144 or 154 made of glass.

In the exemplary embodiments described, the channels are shown as circular bores. However, the cannula protector often has a square cross section. Accordingly, the cross section of the channels can be rectangular or oval.

In the embodiment according to FIGS. 11 and 12, a holding body 170 is made in two parts from a base body 172 and an insert

174 built. The base body 172 contains one

Receiving opening 176, into which inserts 174 optionally

Channels 178 of different cross-sectional shape for

Adaptation to the different forms of cannula protection can be used. In the embodiment according to FIGS. 11 and 12, the base body 172 is on an end face (top in

Fig. 11) open, cuboid or cube-shaped hollow body.

The inserts 174 have shell-shaped parts 180 which close off the open end face of the hollow body and run out in a central shaft 182 forming the channel 178.

In the embodiment according to FIG. 13, the base body 184 is a rotary body with a jacket surface 186 drawn in in the middle. The base body forms a hollow body which is open on the upper end face. In the embodiment according to FIG. 13, the hollow body j-edoch is closed at the lower end face by a bottom 188. Similar to the embodiment according to FIG. 11, a collar 190 sits on the floor, which forms a receiving opening 192 for an insert 194. Similar to the embodiment according to FIG. 11, the insert 194 is provided with a shell-shaped part 196 which closes off the upper end face of the hollow body 186 forming the base body. The bowl-shaped part runs again in a central shaft 198 which sits in the receiving opening 192. The shaft 198 forms a channel 200 for receiving cannula protection.

In the embodiment according to FIG. 14, the base body 202 is again a rotary body with a jacket surface 204 drawn in in the middle. In contrast to the embodiments according to FIGS. 14) open hollow body. An insert 206 has two shell-shaped parts 208 and 210 arranged back to back to one another. The shell-shaped parts 208 and 210 are connected to one another via a central middle part 212. The middle part 212 forms a channel 214 for receiving a cannula protector.

In the embodiment according to FIGS. 15 and 16, the base body 216 has locking members 218, 220, 222 and 224 molded onto it in a manner similar to the embodiment according to FIG. Similar to FIG. 7, the base body 216 contains a base 226. This base 226 has a receiving opening 230 for an insert 232 in a surface 228. Lugs are formed on the base 226 around the receiving opening 230, which axially over the surface 228 of the Stand out base 226 and form the locking members 218,220,222 and 224. In the embodiment according to FIGS. 15 and 16, the base 226 is a base plate with a square plan, from the edge of which parallel columns of square cross section protrude in the corners of the square as blocking members 218, 220, 222 and 224. The receiving opening 230 is formed centrally between the columns. The receiving opening 230 is a flat, square depression in the base plate. In this way, the receiving opening 230 is secured against rotation. The insert 232 has a disk-shaped upper part 234. A shaft sits on the upper part 234 236. The shaft 236 has a square outer contour adapted to the receiving opening 230. The shaft 236 is seated in the receiving opening 230. The upper part 232 is guided between the columns forming the blocking members 218, 220, 222 and 224. Runs into the shaft 236

Channel 238, which here has a square cross section and is designed to accommodate a correspondingly shaped cannula protector.

The design according to Fig. 17 is constructed similarly to the designs according to Fig. 15 and 16. Corresponding parts are provided with the same reference numerals as there. An insert 240 there contains a bowl-shaped upper part 242. A shaft 244 is connected to the bowl-shaped upper part 242 again. The SChaft 244 is seated in a rotation-proof receiving opening 246. The receiving opening 246 is here formed by a flat base 248, which is molded onto the base plate forming the base 226. Radial stiffening ribs 250 are provided between the underside of the upper part 242 and the shaft 244, similar to the embodiment according to FIG. The shaft 244 again contains a channel 252.

The embodiment according to FIGS. 18 and 19 is based on a basic structure of the base body 254, which is similar to the structure of the holding body from FIG. The base body 254 has a base 256. A square receiving opening 258 is provided in the base 256. The receiving opening 258 extends from a surface 260 of the base 256. Lugs 262, 264, 266 and 268 are formed on the base 256 around the receiving opening 258. The lugs 262, 264, 266 and 268 project axially beyond the surface 260 of the base and form locking members. In the embodiment according to FIGS. 18 and 19, the surface 260 of the base 256 is concave. Approaches 262, 264, 266 and 268 also have concave surfaces. The surface 260 of the base and these surfaces of the lugs 262, 264, 266 and 268 lie on an imaginary, concave surface of revolution. An insert 270 is inserted into this base body 254. The insert 270 has a shell-shaped part 272, the outer surface of which is complementary to the said rotating surface and the surface 260. This bowl-shaped part 272 rests on the surface 260 of the base 256 and the said surfaces of the lugs 262, 264, 266 and 268. A shaft 274 of square cross-section adjoins the bowl-shaped part 272 and sits in the square receiving opening 258. A square channel 276 for receiving a cannula protector is guided in the shaft 274.

FIGS. 20 and 21 show different possible shapes of the shaft 274, which offer protection against rotation and contain different square or circular channels 276.

The holding body 310 of FIG. 22 is a hollow body made of a plastic injection-molded part and open on one side, having a cuboid, preferably cube-shaped, basic shape. A funnel-shaped or spherical depression 314 is formed in the middle on the top side 312 of the cube-shaped holding body 310. The funnel-shaped depression 314 merges into a tubular extension 316 at its base. The tubular extension 316 extends centrally perpendicular to the plane of the upper side 312 through the interior enclosed by the holding body. The inner wall of the funnel-shaped recess forms a surface 318 that is resistant to piercing the cannula. The tubular extension 316 encloses a channel 320 for receiving the cannula protection. The side walls 322, 324, 326 and 328 of the cube-shaped holding body 310 are smooth. A strip 330 extends along the edge between the side walls 326 and 328 on the inside of the holding body 310 designed as a hollow body. A slot 332 is formed along the edge and extends in a diagonal plane of the cube-shaped holding ear 310. A saw 334 is interchangeably clamped in this longitudinal slot 332.

The embodiment according to FIGS. 25 to 27 also shows a holding body 336 of a cube-shaped basic shape. The holding body 336 contains an essentially cube-shaped hollow body 338 which is open on one side and has an upper side 340 and four side walls 342, 344, 346 and 348. A spherical funnel-shaped depression 350 is formed in the upper side, similar to the embodiment 22 to 24. The recess 350 is followed by a tubular extension 352 on the bottom thereof. The outer surface of the recess 350 again forms the surface which is resistant to insertion of the cannula. The tubular extension surrounds the channel 354, in which the cannula protection can be held.

The interior of the hollow body 338 formed in this way, consisting of a resistant plastic, is filled with a casting compound 356. This creates an essentially solid cube. Recesses 358, 360, 362 and 364 are formed in the potting compound 356 around the channel 354. The depressions are cylindrical and have different diameters. A matching recess 358, 360, 362 or 364 can then be selected for each of the different types of ampoules.

Along an edge of the cube between the side walls 346 and 348 a replaceable saw 366 is again provided.

An ampoule that can be opened can be sawn by means of the saw 366. The saw body can be held securely with the holding body 336. After sawing, the head part of the ampoule is inserted into one of the recesses 358 to 364 or into the open end of the channel 354. The head of the ampoule can then be broken off without the risk of injury.

Claims

1. Protective device for avoiding injuries when replacing a cannula guard on a used cannula for medical syringes with a holding body (10; 52) with a straight channel (22; 44; 64) designed to accommodate the cannula guard (24), characterized in that

a) the channel is surrounded by a smooth surface which is resistant to puncturing the cannula and

b) the surface around the channel forms an edge that is much wider than that

Cross-sectional dimensions of the channel.

2. Protection device according to claim 1, characterized gekenn¬ characterized in that a raised edge (22; 66, 76) is formed between the channel (22, 28; 64) and the gripping surface (28; 60).

3. Protection device according to claim 1 or 2, characterized in that the channel (22; 44; 64) is attached to the bottom of a recess (18, 50) formed in the holding body (10; 52).

4. Protection device according to claim 3, characterized in that the recess (18, 50) to the channel (22; 44; 64) narrows steadily.

5. Protection device according to claim 4, characterized gekenn¬ characterized in that the depth of the channel (22) is significantly less than the length of the cannula protection (24).

6. Protection device according to one of claims 1 to 5, characterized in that the holding body (10; 52) is retracted in the region of the gripping surface (28, 60).

7. Protection device according to claim 1, characterized gekenn¬ characterized in that

a) the holding body (10) is a rotating body with an axis (20), at least one end face (12) and a lateral surface (16),

b) a depression (18) is formed in the end face (12), which narrows steadily towards the axis (20),

c) on the base of the depression (18) along the axis (20) is arranged the channel (22) arranged to receive the cannula protector (24),

d) the outer surface (16) is drawn in opposite to the edge of the end face (12) to form the gripping surface (28).

8. Protection device according to one of claims 1 to 7, characterized in that the holding body (10) consists of a temperature-resistant, sterilizable material with a smooth surface.

9. Protection device according to claim 7, characterized in that the channel (44) is continuous extends through the entire holding body (10).

10. Protection device according to one of claims 1 to 9, characterized in that in the channel (44) open radial transverse channels (46) emanating from the lateral surface (16) of the holding body (10).

11. Protection device according to claim 3, characterized gekenn¬ characterized in that the surface of the recess (50) is formed by an insert (48) which is held interchangeably in the holding body (52).

12. Protection device according to claim 11, characterized gekenn¬ characterized in that the insert (48) consists of an easily sterilizable material.

13. Protection device according to claim 12, characterized gekenn¬ characterized in that the insert (48) consists of stainless steel.

14. Protection device according to claim 11, characterized gekenn¬ characterized in that the insert (48) consists of a throwaway material.

15. Protection device according to claim 11, characterized in that

a) the holding body (52) has a recess (62) which is open on one side,

b) the insert (48) is formed by a shell which can be pushed into the recess (62) from this side and which has an opening (78) on its base which is flush with the channel (64) when inserted, and c) a guide (70) is provided on the holding body (52), which guides the insert (48) in the direction of insertion and secures it perpendicularly thereto.

16. Protection device according to claim 15, characterized gekenn¬ characterized in that

a) the guide of a groove (70) along the circumference of the provided in the holding body (52) to one

Side open recess (62) is formed, which is at a distance from the upper edge (68) of this recess

(62) runs,

b) on the insert (48) a projecting strip (74) is provided which leads in the groove (70), and

c) an edge (76) is formed on the insert (48), which covers the inner wall (66) of the recess (62) between the groove (70) and the upper edge (68).

17. Protection device according to claim 16, characterized gekenn¬ characterized in that a side handle (80) is attached to the insert (48) by means of which the insert (48) from the recess (62) of the holding body (52) without touching the inner surface the insert (48) can be pulled out.

18. Protection device according to claim 1, characterized in that

a) the holding body (82) is funnel-shaped with a conical upper part (81) and an adjoining tubular lower part (86), the lower part (86) forming the channel (88) contains the cannula protector,

b) the holding body (82) has a plurality of radial, regularly arranged radial ribs (90, 92, 94) extending between the outer surface (96) of the upper part (84) and the outer surface (98) of the lower part (86) and

c) the ribs (90, 92, 94) form a base (100) with the end face of the lower part (86).

19. Protection device according to claim 18, characterized gekenn¬ characterized in that the holding body (82) consists of porcelain.

20. Protection device according to claim 1, characterized in that the holding body (104) has integrally formed locking members (106, 108, 110, 114) which are at a large distance from the channel (114) compared to the cross-sectional dimensions of the channel (114) are arranged to prevent unintentional contact with the surface (116) surrounding the channel (114).

21. Protection device according to claim 20, characterized in that

a) the holding body (104) has a base (118) with said surface (116) and the channel (114) and

b) lugs are formed on the base (118) around the channel (114), which project axially beyond the surface (116) and form locking members (106, 108, 110, 112).

22. Protection device according to claim 21, characterized in that

a) the surface (116) forms a flat surface of a square basic shape, in the center of which the channel (114) is attached,

b) the lugs are arranged in the corners of the square defined by said surface (116) and form radial ribs, the distance between adjacent inner edges (120, 122) of the ribs providing access to the surface (116) for the user's fingers difficult, and,

c) the base (118) and the ribs form a standing surface (124) on the side facing away from the said surface (116).

23. Protection device according to claim 1, characterized in that

a) the holding body (126) is formed by a cuboid block (128),

b) a funnel-shaped depression (132) is formed in at least one side surface (130) of the block (128) and forms the surface in question and

c) the channel (134) extends through the block (128).

24. Protection device according to claim 23, characterized in that two funnel-shaped depressions are provided in opposite side surfaces of the block and are connected to one another by a single channel.

25. Protection device according to claim 23, characterized gekenn¬ characterized in that a funnel-shaped depression (132, 140) is formed in two adjacent side surfaces (130, 138) of the block (.128) and the associated channels through the block (128) (134, 142) cross each other.

26. Protection device according to one of claims 20 to 25, characterized in that the holding body (126)

Melamine resin is made.

27. Protection device. according to claim 1, characterized in that the holding body (144) is formed by two shells (146, 148) arranged back to back, which are connected on their base by the channel (150).

28. Protection device according to claim 27, characterized in that the holding body (144) is formed in a coil-like manner with the two shells (146, 148) connected by a tubular section (152), the tubular section forming the said channel.

29. Protection device according to claim 27, characterized in that

a) the holding body (154) in its basic form a rotating body with a toric, retracted , Lateral surface (156) is,

b) cup-shaped depressions (162, 164) are formed in the opposite end faces (158, 160) of the holding body (154), and

c) the bowl-shaped depressions (162, 164) are connected on their base by the channel (166).

30. Protection device according to one of claims 27 to 29, characterized in that the holding body (144, 154) consists of glass.

31. Protection device according to one of claims 1 to 30, characterized in that the channel is rectangular

Cross section.

32. Protection device according to claim 1, characterized in that the holding body (170) contains a base body (172) with a receiving opening (176), in which optional inserts (174) with channels (178) of different cross-sectional shapes to adapt to the different Forms of cannula protection can be used.

33. Protection device according to claim 32, characterized gekenn¬ characterized in that

a) the base body (172) is a hollow body open on one end face and

b) the inserts (174) have shell-shaped parts (180) which close off the open end face of the hollow body and run out in a central shaft (182) forming the channel (178).

34. Protection device according to claim 32, characterized gekenn¬ characterized in that

a) the base body (202) is a hollow body open on opposite end faces and

b) the inserts (206) have back-to-back mutually arranged bowl-shaped parts (208, 210), which have a central channel

(214) forming the central part (212) are interconnected.

35. Protection device according to claim 33 or 34, characterized in that the base body (172) is cuboid.

36. Protection device according to claim 33 or 34, characterized in that the base body (184, 202) is a rotating body with a jacket surface (186, 204) drawn in in the middle.

37. Protection device according to claim 32, characterized in that

the base body (216) has molded-on locking members (218, 220, 22, 224) which are arranged at a large distance from the receiving opening (230) in relation to the cross-sectional dimensions of the channel in such a way that they prevent unintentional contact with the surface surrounding the channel (238).

38. Protection device according to claim 37, characterized in that l - a) the base body (216) has a base (226) with said receiving opening (230) in a surface thereof and

5 b) projections (218, 220, 222, 224) are formed on the base (226) around the receiving opening (230), which project axially beyond the surface of the base (226) and form locking members.

0 39. Protection device according to claim 38, characterized in that

a) the receiving opening (230) is a depression with a torsion-proof cross section and 5 b) the inserts (232) have prismatic parts (236) which can be inserted in the receiving opening (230) and have the channels (238). 0

40. Protection device according to claim 38 or 39, characterized in that said surface of the base is concave.

5 41. Protection device according to claim 40, characterized in that

a) the surface (260) of the base (256) and surfaces of the lugs (262,264,266,268) lie on an imaginary 0 concave surface of revolution and

b) the inserts (270) around the channels (276) have shell-shaped parts (272), the outer surface of which is complementary to the said 5 rotational surface and which are on the surface of the Base (256) and said areas of the approaches (262,264,266,268) lie on.

42. Protection device according to claim 37, characterized in that the base body (216)

a) has a base plate (226), from the edge of which, as locking members (218, 220, 222, 224), project parallel columns and

b) a non-rotatable receiving opening (230) is formed centrally between the columns and

c) the inserts (232, 240) have a disk-shaped or shell-shaped upper part (234, 242) and a shaft (236, 244) seated thereon with a channel (238, 252) and with an outer contour adapted to the receiving opening (230, 248), the shaft (236, 244) in the receiving opening (230,248) sits and the upper part (232,240) is guided between the columns.

43. Protection device according to claim 42, characterized in that the receiving opening (230) is formed by 5 of a shallow depression in the base plate (226).

44. Protection device according to claim 43, characterized gekenn¬ characterized in that the receiving opening is formed by a flat 0 base (248) which is integrally formed on the base plate (226).

45. Protection device according to one of claims 42 to 44, characterized in that between the underside 5 of the upper part (240) and the shaft (244) radial Stiffening ribs (250) are provided.

46. Protection device according to claim 1, characterized in that a saw (334; 366) is attached to the holding body (310; 336).

47. Protection device according to claim 46, characterized gekenn¬ characterized in that the holding body (336) further comprises at least one recess (358,360,362,364) for inserting and breaking off the head of an ampoule.

48. Protection device according to claim 46 or 47, characterized in that the saw (334; 366) is interchangeably attached to the holding body (310; 336).

49. Protection device according to claim 47, characterized gekenn¬ characterized in that the recess (358,360,362,364) for inserting and breaking off the ampoule on one of said surface (354) surrounding the channel (353) opposite side of the holding body (336) is provided .

50. Protection device according to one of claims 46 to 49, characterized in that the holding body (310; 336) has a cuboid basic shape.

51. Protection device according to claim 50, characterized gekenn¬ characterized in that a recess (350) with the channel (354) - surrounding surface (353) is provided on an upper side (340) of the rectangular holding body (336) and the recess (358 , 360,362, 364) for receiving the head of the ampoule on the opposite underside. 52. Protection device according to claim 50 or 51, characterized in that the holding body (310, 336) is a substantially cuboid hollow body which is designed as a plastic injection molded part and is open on one side

5, said surface (318, 353) being provided on the upper side (312; 340) opposite the open side and the channel (320; 354) being formed by a tubular extension (316; 354) which extends through the interior of the hollow body 0 extends.

53. Protection device according to claim 52, characterized gekenn¬ characterized in that the interior of the hollow body (338) around the tubular extension (352) with a 5 potting compound (356) is poured and in this potting compound (356) a plurality of cylindrical recesses (358,360,362,364) are formed.

54. Protection device according to claim 53, characterized in that the recesses (358,360,362,364) have different diameters.

25

30

35