CA2034556A1 - Needle-mounted hypodermic needle guard - Google Patents
Needle-mounted hypodermic needle guardInfo
- Publication number
- CA2034556A1 CA2034556A1 CA 2034556 CA2034556A CA2034556A1 CA 2034556 A1 CA2034556 A1 CA 2034556A1 CA 2034556 CA2034556 CA 2034556 CA 2034556 A CA2034556 A CA 2034556A CA 2034556 A1 CA2034556 A1 CA 2034556A1
- Authority
- CA
- Canada
- Prior art keywords
- needle
- tip
- guard
- front portion
- transverse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
A needle guard is provided which is needle-mounted and free-floating and which automatically engages with the needle on being slid to the tip. Improvements include a lateralmounting capacity and use of a sheet of metal from which guard components may be stamped.
Description
Title: NEEDLE GUARD DEVICE
Z03~556 Field of the Invention:
This invention relates to protective devices for cover:ing the tip of a hypodermic needle and the like after 05 use. More particularly it relates to improvements to a needle-mounted guard.
Background to the Invention The inventors herein are the named inventors in PCT
application PCT/CA90/000 31 published August 9, l990 undsr International Publication Number W0 90/08564. This published PCT application relates to a needle-mounted needle tip guard that locks in place automatically over the tip when moved from the base of the needle to the tip.
Another device of related application is disclosed in U.S. patent No. 4,929,241 issued to John C. Kulli on ~ay 20, l990. That patent describes a device with two spring-loaded arms that collapse together on reaching the needle tip, causing blades carried by such arms to engage with the needle and thereby prevent further removal of the guard from the needle. The needle-tip is prevented from re-emerging from this guard by inwardly formed edges on the arms which form shields which overlie the needle and block the tip from passing outwardly from the needle guard.
This present invention has as its objects improvements to this last cited prior art reference.
Z03~556 Field of the Invention:
This invention relates to protective devices for cover:ing the tip of a hypodermic needle and the like after 05 use. More particularly it relates to improvements to a needle-mounted guard.
Background to the Invention The inventors herein are the named inventors in PCT
application PCT/CA90/000 31 published August 9, l990 undsr International Publication Number W0 90/08564. This published PCT application relates to a needle-mounted needle tip guard that locks in place automatically over the tip when moved from the base of the needle to the tip.
Another device of related application is disclosed in U.S. patent No. 4,929,241 issued to John C. Kulli on ~ay 20, l990. That patent describes a device with two spring-loaded arms that collapse together on reaching the needle tip, causing blades carried by such arms to engage with the needle and thereby prevent further removal of the guard from the needle. The needle-tip is prevented from re-emerging from this guard by inwardly formed edges on the arms which form shields which overlie the needle and block the tip from passing outwardly from the needle guard.
This present invention has as its objects improvements to this last cited prior art reference.
- 2 - ~0345S6 Summary of the Invention In accordance with one feature of the invention a basic needle guard comprising:
(l) means for mounting substantially the entire guard 05 for sliding motion along the needle towards the tip; and (2) a front portion comprising at least one transverse shield which is arm secured to the mounting means for collapsing to form a barrier in front of the needle tip when the front portion is advanced past the tip of the needle is provided. In this basic needle guard guide means is provided in the form of needle-engaging notch formed in said transverse shield to locate the front portion of the needle guard in alignment with the needle.
By a further feature of the invention the basic needle guard comprises a sheet of metal and further comprises at least one needle-engaging blade that is bent out of the surface of such sheet of metal.
By a further feature of the invention the basic needle guard comprises a sleeve with an interior surface shaped to embrace a portion of the hub of the needle upon which it is mounted. Preferably such sleeve may frictionally engage with such hub in a manually releasable manner.
By a further feature of the invention, the basic needle-guard comprises a pair of parallel spring-loaded ;~03~556 longitudinal arms which extend out to and support the front portion of the needle guard, at least one of such arms having a transverse slot therethrough, there being provided a needle-engaging blade affixed to such slotted arm by insertion through 05 the aforesaid slot. Preferably, such blade engages with the arm by means of a retention barb struck-out from the blade.
By a further feature of the invention, the basic needle guard is provided with two transverse arms which serve as shields, each carrying ~-omplementary engagement means whereby such shields inter-engage with each other in a non-separable fashion after collapsing in front of the needle tip.
By a further feature of the invention, the basic needle guard is slotted on one side so as to permit it to be mounted on a needle by lateral displacement. As one option the slot may be under cut so as to require that it be pressured into place on the needle and provide resistance to lateral removal thereafter. As another option a complementary retention means in the form of a plate with a transverse slot and engagement means for fastening such plate to the needle guard, with its slot directed in the opposed direction to the slot on the basic needle guard, may be provided.
By a further feature of the invention, the plate of the last embodiment may communicate with the longitudinal arms of the earlier embodiment to apply an inwardly directed resilient force to such arms.
~034556 ~ 4 The invention in its general form will first be descr:ibed, and then its implementation in terms of specific embodiments will be detailed with reference to the drawings following hereafter. These embodiments are intended to 05 demonstrate the principle of the invention, and the manner of its implementation. The invention will then be further described, and defined, in each of the individual claims which conclude this Specification.
Summary of the Fiqures Figure 1 shows a side view of the prior art United States patent reference.
Figure 2 shows the mounting of a blade in a thickened portion of the prior art needle guard through an added slot, anchored by a barb.
Figure 2A shows a barb formed on a blade/ separated from the needle guard before installation.
Figure 2B shows a strip of metal from which a series of such blades may be continuously cut.
Figure 3 shows a version of the needle guard made entirely of metal, with integrally-formed needle-engaging blades.
Figure 4 shows a partial view of a version of the needle guard of Figure 3, with the ends of the transverse shields inter-engaged in a locked manner.
Figure 4A is a broken end view of Figure 4.
_ 5 _ 2034556 Figure 5 shows a push-nut style version of the guard, adapted to be side-mounted, and incorporating notched ends on the transverse shields to stabilize the front portion of the needle guard on the needle.
05 Figure 5A shows an end view of the guard of Figure 5.
Figure 6 shows the needle guard of Figure 5 fitted with a supplementary cap, and in its locked state.
Figure 6A shows an end view of the needle guard of Figure 6, with the supplementary cap slotted for side-entry of the needle.
Figure 6B shows an end view of the needle guard of Figure 6, with the supplementary cap furnished with a large central hole for axial needle entry.
Figure 7 shows a prior art needle guard with a central extension embracing the hub of the needle.
Figure 8 shows an all-metal needle guard with a central extension embracing the hub of the needle.
Description of the Preferred Embodiments In Figure 1 the principle drawing of the prior Kulli reference is shown. In this drawing a generally rectangular protective guard 10 is shown. At the back end 12 of the guard 10 is a transverse wall 13 in which a hole 11 is formed for passage of a needle 14.
Supported at opposite sides of this wall 13 are respective forward-extending jaws or longitudinal arms 15, 16.
For economy of manufacture and reliable operation, the longitudinal arms 15, 16 are preferably unitary with the wall 13.
~;)3~56 At the front portion 20 of the guard 10 - which is to say, at the front ends of the two longitudinal arms 15, 16 respectively - are two opposed transverse arms 24, 26 which serve as shields. The shields are very strongly spring loaded 05 or otherwise very strongly biased against the needle 14.
Preferably this biasing force is provided by the spring action of the longitudinal arms 15, 16 themselves; for this purpose the wall 13, longitudinal arms 15, 16 and the shields 24, 26 are formed as a single unitary article from a tough and springy material such as glass-filled nylon. One of these transverse shields 26 is positioned slightly in front of the other 24, so that the shields are staggered lengthwise along the needle 14 as mentioned earlier.
The edges 25, 27 of the shields 24, 26 are thus in contact with and separated by the needle 14 until they are advanced past the needle tip 18. Then, when the shields 24, 26 are no longer separated by the needle 14, the guard 10 collapses forcibly, under the influence of the biasing force described above, to form a protective barrier 29.
Although the guard is shown as generally rectangular, other configurations such as a cylinder or a cone could also be suitable. The rectangular shape, is perhaps easiest to illustrate and discuss.
Razor-sharp blades 30 are hinged 32 in the guard 10. In the non-activated state the blades 30 are directed forward and are not in contact with the needle 14, while the shield edges ~034556 25, 27 are separated by the needle 14.
The foregoing has been a description of a prior art reference.
Figure 2 shows an enlarged view of the plastic arm 15 05 of Figure 1 fitted with a new style of blade 40. This blade 40 is inserted through a slot 41 in the transverse arm 15, thus facilitating assembly of the device.
The blade 40 as shown in Figure 2A has a bar 42 bent out of the blade 40. This barb 42 serves to stabilize the blade 40 in place within the slot 41.
In Figure 2B a method of manufacturing the blade 40 is shown. A strip of steel 43 is stamped to provide a linked chain of blades 40 with cuts 44 for breaking out the barbs 42.
Once so formed, individual blades 40A may be broken-off from the strip 43 and inserted into the guard 10.
In Figure 3 a guard 45 is shown that is stamped from a single sheet of metal 47. Blades 46 are pressed by stamping out of the metal sheet 47. The ends 48 of the blades 46 are not notched to embrace the needle 14. The base end 49 embraces the needle 14 and holds the longitudinal arms 50 resiliently in place, thus serving as mounting means.
Transverse arms 51 are spring loaded to pass into the path of the needle 14 under the biasing pressure applied by the longitudinal arms 50.
In Figure 4 details of modified transverse arms 52, 52A are shown. Notices 53 are formed to inter-engage with spurs 54 on the complementary transverse arm 52, 52A. When the arms 52, 52A are released by withdrawal of the needle, these arms 52, 52A overlap and the complementary notches 53 and spurs 54 engage and lock the two arms together.
05 Figure 5 herein shows an improved metal version of the earlier device, arranged in the manner of an extended pushnut.
In Figure 5 leaves 201 are formed in a familiar pushnut way in end plate 202, which has a lateral needle-entry slot 203. As this weakens the end, side flanges 204 are optionally formed to stiffen it.
Upper and lower arms 205, 206 function primarily as extensions of leaves 201 beyond their pivot points in the rim of end 202, and are formed into partly cylindrical cross-sections, as shown in Section A-A of Figure 5. This stiffens 15 them so that motion of their sensing ends 207, 208 is translated into angular motion of leaves 201, along with a slight deformation of flanged end 202.
In the unlocked state as shown in Figure 5, the separaticn of the arms by the presence of the needle distorts the end 202 from its free state, and swings the leaves clear of the needle shaft 200. The resistive spring action of the end 202 develops a closing pressure of 207 and 208 on the needle 200 through the arms 205, 206.
When the needle point enters the guard as shown in Figure 6, the resulting inward angular motion of the sensing ends 207 and 208 allows the leaves 201 to close and grip the needle shaft 200 like a pushnut.
Z03455~i g Because arms 205 and 206 are partly cylindrical in cross-section, they enclose the needle when they collapse inwardly, to protect against accidental contact with the needle point.
05 The operation appears similar to that of the Kulli device. However, the integral leaves 201, which replace the separate blades in the prior reference, are at the end of the needle guard closest to the needle base, and are brought into action by angular rather than lateral, displacement, through the motion of arms 205 and 206.
Optionally, one may press on a supplementary cap 208 to strengthen the end. By making the cap 208 with a slotted-finger extension 209, this can also provide additional spring action.
As shown in Figure 6A, the supplementary cap 208A may have a slotted needle access opening 210 for side-entry of the needle 200 during assembly. Alternatively, as shown in Figure 6B, cap 208B may have a large central hole 211 for easy axial insertion of the needle. With cap 208 installed, the flanges 204 of Figure 6 are not necessarily required.
This device exchanges significant lateral blade motion during locking, with its concomitant high sensing-end forces, for a more subtle angular motion of the locking leaves, with much reduced sensing-end forces and correspondingly reduced drag resistance to sliding on the needle. The necessary clamping force against the needle is no different, but by ~034556 moving this clamping point close to the fulcrum, (the right-hand end of the device), this force is taken almost entirely at this point.
Figure 7 shows a version of the prior art needle guard 05 of Figure 1, fitted with an axial extension 212 of the base 13, containing an axial recess 213 to fit over the base or hub 214 of the needle 200. Extension 212 may have one or more axial slots 215 to provide compliance, allowing the needle guard to be held frictionally on needle base 214 to some desired degree of retention, prior to its deployment.
Figure 8 shows a similar extension 212A of the supplementary cap 208C of an all-metal version of the needle guard, gripping the needle base 214 for retention of the guard.
Conclusion The foregoing has constituted a description of specific embodiments showing how the invention may be applied and put into use. These embodiments are only exemplary. The invention in its broadest, and more specific aspects, is further described and defined in the claims which now follow.
(l) means for mounting substantially the entire guard 05 for sliding motion along the needle towards the tip; and (2) a front portion comprising at least one transverse shield which is arm secured to the mounting means for collapsing to form a barrier in front of the needle tip when the front portion is advanced past the tip of the needle is provided. In this basic needle guard guide means is provided in the form of needle-engaging notch formed in said transverse shield to locate the front portion of the needle guard in alignment with the needle.
By a further feature of the invention the basic needle guard comprises a sheet of metal and further comprises at least one needle-engaging blade that is bent out of the surface of such sheet of metal.
By a further feature of the invention the basic needle guard comprises a sleeve with an interior surface shaped to embrace a portion of the hub of the needle upon which it is mounted. Preferably such sleeve may frictionally engage with such hub in a manually releasable manner.
By a further feature of the invention, the basic needle-guard comprises a pair of parallel spring-loaded ;~03~556 longitudinal arms which extend out to and support the front portion of the needle guard, at least one of such arms having a transverse slot therethrough, there being provided a needle-engaging blade affixed to such slotted arm by insertion through 05 the aforesaid slot. Preferably, such blade engages with the arm by means of a retention barb struck-out from the blade.
By a further feature of the invention, the basic needle guard is provided with two transverse arms which serve as shields, each carrying ~-omplementary engagement means whereby such shields inter-engage with each other in a non-separable fashion after collapsing in front of the needle tip.
By a further feature of the invention, the basic needle guard is slotted on one side so as to permit it to be mounted on a needle by lateral displacement. As one option the slot may be under cut so as to require that it be pressured into place on the needle and provide resistance to lateral removal thereafter. As another option a complementary retention means in the form of a plate with a transverse slot and engagement means for fastening such plate to the needle guard, with its slot directed in the opposed direction to the slot on the basic needle guard, may be provided.
By a further feature of the invention, the plate of the last embodiment may communicate with the longitudinal arms of the earlier embodiment to apply an inwardly directed resilient force to such arms.
~034556 ~ 4 The invention in its general form will first be descr:ibed, and then its implementation in terms of specific embodiments will be detailed with reference to the drawings following hereafter. These embodiments are intended to 05 demonstrate the principle of the invention, and the manner of its implementation. The invention will then be further described, and defined, in each of the individual claims which conclude this Specification.
Summary of the Fiqures Figure 1 shows a side view of the prior art United States patent reference.
Figure 2 shows the mounting of a blade in a thickened portion of the prior art needle guard through an added slot, anchored by a barb.
Figure 2A shows a barb formed on a blade/ separated from the needle guard before installation.
Figure 2B shows a strip of metal from which a series of such blades may be continuously cut.
Figure 3 shows a version of the needle guard made entirely of metal, with integrally-formed needle-engaging blades.
Figure 4 shows a partial view of a version of the needle guard of Figure 3, with the ends of the transverse shields inter-engaged in a locked manner.
Figure 4A is a broken end view of Figure 4.
_ 5 _ 2034556 Figure 5 shows a push-nut style version of the guard, adapted to be side-mounted, and incorporating notched ends on the transverse shields to stabilize the front portion of the needle guard on the needle.
05 Figure 5A shows an end view of the guard of Figure 5.
Figure 6 shows the needle guard of Figure 5 fitted with a supplementary cap, and in its locked state.
Figure 6A shows an end view of the needle guard of Figure 6, with the supplementary cap slotted for side-entry of the needle.
Figure 6B shows an end view of the needle guard of Figure 6, with the supplementary cap furnished with a large central hole for axial needle entry.
Figure 7 shows a prior art needle guard with a central extension embracing the hub of the needle.
Figure 8 shows an all-metal needle guard with a central extension embracing the hub of the needle.
Description of the Preferred Embodiments In Figure 1 the principle drawing of the prior Kulli reference is shown. In this drawing a generally rectangular protective guard 10 is shown. At the back end 12 of the guard 10 is a transverse wall 13 in which a hole 11 is formed for passage of a needle 14.
Supported at opposite sides of this wall 13 are respective forward-extending jaws or longitudinal arms 15, 16.
For economy of manufacture and reliable operation, the longitudinal arms 15, 16 are preferably unitary with the wall 13.
~;)3~56 At the front portion 20 of the guard 10 - which is to say, at the front ends of the two longitudinal arms 15, 16 respectively - are two opposed transverse arms 24, 26 which serve as shields. The shields are very strongly spring loaded 05 or otherwise very strongly biased against the needle 14.
Preferably this biasing force is provided by the spring action of the longitudinal arms 15, 16 themselves; for this purpose the wall 13, longitudinal arms 15, 16 and the shields 24, 26 are formed as a single unitary article from a tough and springy material such as glass-filled nylon. One of these transverse shields 26 is positioned slightly in front of the other 24, so that the shields are staggered lengthwise along the needle 14 as mentioned earlier.
The edges 25, 27 of the shields 24, 26 are thus in contact with and separated by the needle 14 until they are advanced past the needle tip 18. Then, when the shields 24, 26 are no longer separated by the needle 14, the guard 10 collapses forcibly, under the influence of the biasing force described above, to form a protective barrier 29.
Although the guard is shown as generally rectangular, other configurations such as a cylinder or a cone could also be suitable. The rectangular shape, is perhaps easiest to illustrate and discuss.
Razor-sharp blades 30 are hinged 32 in the guard 10. In the non-activated state the blades 30 are directed forward and are not in contact with the needle 14, while the shield edges ~034556 25, 27 are separated by the needle 14.
The foregoing has been a description of a prior art reference.
Figure 2 shows an enlarged view of the plastic arm 15 05 of Figure 1 fitted with a new style of blade 40. This blade 40 is inserted through a slot 41 in the transverse arm 15, thus facilitating assembly of the device.
The blade 40 as shown in Figure 2A has a bar 42 bent out of the blade 40. This barb 42 serves to stabilize the blade 40 in place within the slot 41.
In Figure 2B a method of manufacturing the blade 40 is shown. A strip of steel 43 is stamped to provide a linked chain of blades 40 with cuts 44 for breaking out the barbs 42.
Once so formed, individual blades 40A may be broken-off from the strip 43 and inserted into the guard 10.
In Figure 3 a guard 45 is shown that is stamped from a single sheet of metal 47. Blades 46 are pressed by stamping out of the metal sheet 47. The ends 48 of the blades 46 are not notched to embrace the needle 14. The base end 49 embraces the needle 14 and holds the longitudinal arms 50 resiliently in place, thus serving as mounting means.
Transverse arms 51 are spring loaded to pass into the path of the needle 14 under the biasing pressure applied by the longitudinal arms 50.
In Figure 4 details of modified transverse arms 52, 52A are shown. Notices 53 are formed to inter-engage with spurs 54 on the complementary transverse arm 52, 52A. When the arms 52, 52A are released by withdrawal of the needle, these arms 52, 52A overlap and the complementary notches 53 and spurs 54 engage and lock the two arms together.
05 Figure 5 herein shows an improved metal version of the earlier device, arranged in the manner of an extended pushnut.
In Figure 5 leaves 201 are formed in a familiar pushnut way in end plate 202, which has a lateral needle-entry slot 203. As this weakens the end, side flanges 204 are optionally formed to stiffen it.
Upper and lower arms 205, 206 function primarily as extensions of leaves 201 beyond their pivot points in the rim of end 202, and are formed into partly cylindrical cross-sections, as shown in Section A-A of Figure 5. This stiffens 15 them so that motion of their sensing ends 207, 208 is translated into angular motion of leaves 201, along with a slight deformation of flanged end 202.
In the unlocked state as shown in Figure 5, the separaticn of the arms by the presence of the needle distorts the end 202 from its free state, and swings the leaves clear of the needle shaft 200. The resistive spring action of the end 202 develops a closing pressure of 207 and 208 on the needle 200 through the arms 205, 206.
When the needle point enters the guard as shown in Figure 6, the resulting inward angular motion of the sensing ends 207 and 208 allows the leaves 201 to close and grip the needle shaft 200 like a pushnut.
Z03455~i g Because arms 205 and 206 are partly cylindrical in cross-section, they enclose the needle when they collapse inwardly, to protect against accidental contact with the needle point.
05 The operation appears similar to that of the Kulli device. However, the integral leaves 201, which replace the separate blades in the prior reference, are at the end of the needle guard closest to the needle base, and are brought into action by angular rather than lateral, displacement, through the motion of arms 205 and 206.
Optionally, one may press on a supplementary cap 208 to strengthen the end. By making the cap 208 with a slotted-finger extension 209, this can also provide additional spring action.
As shown in Figure 6A, the supplementary cap 208A may have a slotted needle access opening 210 for side-entry of the needle 200 during assembly. Alternatively, as shown in Figure 6B, cap 208B may have a large central hole 211 for easy axial insertion of the needle. With cap 208 installed, the flanges 204 of Figure 6 are not necessarily required.
This device exchanges significant lateral blade motion during locking, with its concomitant high sensing-end forces, for a more subtle angular motion of the locking leaves, with much reduced sensing-end forces and correspondingly reduced drag resistance to sliding on the needle. The necessary clamping force against the needle is no different, but by ~034556 moving this clamping point close to the fulcrum, (the right-hand end of the device), this force is taken almost entirely at this point.
Figure 7 shows a version of the prior art needle guard 05 of Figure 1, fitted with an axial extension 212 of the base 13, containing an axial recess 213 to fit over the base or hub 214 of the needle 200. Extension 212 may have one or more axial slots 215 to provide compliance, allowing the needle guard to be held frictionally on needle base 214 to some desired degree of retention, prior to its deployment.
Figure 8 shows a similar extension 212A of the supplementary cap 208C of an all-metal version of the needle guard, gripping the needle base 214 for retention of the guard.
Conclusion The foregoing has constituted a description of specific embodiments showing how the invention may be applied and put into use. These embodiments are only exemplary. The invention in its broadest, and more specific aspects, is further described and defined in the claims which now follow.
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A needle guard for protecting a needle by covering the tip thereof comprising:
(1) means for mounting substantially the entire guard for sliding motion along the needle towards the tip; and (2) a front portion secured to the mounting means and comprising at least one transverse shield for collapsing to form a barrier in front of the needle tip when the front portion is advanced past the tip wherein such transverse shield is provided with a needle-engaging notch formed in the end thereof to locate the front portion of the needle guard in alignment with the needle.
(1) means for mounting substantially the entire guard for sliding motion along the needle towards the tip; and (2) a front portion secured to the mounting means and comprising at least one transverse shield for collapsing to form a barrier in front of the needle tip when the front portion is advanced past the tip wherein such transverse shield is provided with a needle-engaging notch formed in the end thereof to locate the front portion of the needle guard in alignment with the needle.
2. A needle guard for protecting a needle by covering the tip thereof comprising:
(1) means for mounting substantially the entire guard for sliding motion along the needle towards the tip; and (2) a front portion secured to the mounting means and comprising at least one transverse shield for collapsing to serve as a transverse shield and form a barrier in front of the needle tip when the front portion is advanced past the tip wherein such guard comprises a sheet of metal and further comprises at least one needle-engaging blade that is bent out of the surface of such sheet of metal.
(1) means for mounting substantially the entire guard for sliding motion along the needle towards the tip; and (2) a front portion secured to the mounting means and comprising at least one transverse shield for collapsing to serve as a transverse shield and form a barrier in front of the needle tip when the front portion is advanced past the tip wherein such guard comprises a sheet of metal and further comprises at least one needle-engaging blade that is bent out of the surface of such sheet of metal.
3. A needle guard for protecting a needle by covering the tip thereof comprising:
(1) means for mounting substantially the entire guard for sliding motion along the needle towards the tip; and (2) a front portion secured to the mounting means and comprising at least one transverse shield for collapsing to form a barrier in front of the needle tip when the front portion is advanced past the tip wherein the needle guard comprises a sleeve with an interior surface shaped to frictionally embrace a portion of the hub of the needle upon which it is mounted.
(1) means for mounting substantially the entire guard for sliding motion along the needle towards the tip; and (2) a front portion secured to the mounting means and comprising at least one transverse shield for collapsing to form a barrier in front of the needle tip when the front portion is advanced past the tip wherein the needle guard comprises a sleeve with an interior surface shaped to frictionally embrace a portion of the hub of the needle upon which it is mounted.
4. A needle guard for protecting a needle by covering the tip thereof comprising:
(1) means for mounting substantially the entire guard for sliding motion along the needle towards the tip; and (2) a front portion secured to the mounting means and comprising at least one transverse shield for collapsing to form a barrier in front of the needle tip when the front portion is advanced past the tip wherein the guard comprises a pair of parallel longitudinal resilient arms which extend out to and support the front portion of the needle guard and bias the transverse arms to collapse into the path of the needle, at least one of such longitudinal arms having a transverse slot therethrough, there being provided a needle-engaging blade affixed to such slotted arm by insertion through the aforesaid slot.
(1) means for mounting substantially the entire guard for sliding motion along the needle towards the tip; and (2) a front portion secured to the mounting means and comprising at least one transverse shield for collapsing to form a barrier in front of the needle tip when the front portion is advanced past the tip wherein the guard comprises a pair of parallel longitudinal resilient arms which extend out to and support the front portion of the needle guard and bias the transverse arms to collapse into the path of the needle, at least one of such longitudinal arms having a transverse slot therethrough, there being provided a needle-engaging blade affixed to such slotted arm by insertion through the aforesaid slot.
5. A needle guard as in claim 4 wherein such blade engages with the longitudinal arm by means of a retention barb struck-out from the blade.
6. A needle guard for protecting a needle by covering the tip thereof comprising:
(1) means for mounting substantially the entire guard for sliding motion along the needle towards the tip; and (2) a front portion secured to the mounting means and comprising at least one transverse shield for collapsing to form a barrier in front of the needle tip when the front portion is advanced past the tip wherein the needle guard is provided with two transverse shields, each carrying complementary engagement means whereby such shields engage with each other in a non-separable fashion after collapsing in front of the needle tip.
(1) means for mounting substantially the entire guard for sliding motion along the needle towards the tip; and (2) a front portion secured to the mounting means and comprising at least one transverse shield for collapsing to form a barrier in front of the needle tip when the front portion is advanced past the tip wherein the needle guard is provided with two transverse shields, each carrying complementary engagement means whereby such shields engage with each other in a non-separable fashion after collapsing in front of the needle tip.
7. A needle guard for protecting a needle by covering the tip thereof comprising:
(1) means for mounting substantially the entire guard for sliding motion along the needle towards the tip; and (2) a front portion secured to the mounting means and comprising at least one transverse shield for collapsing to form a barrier in front of the needle needle tip when the front portion is advanced past the tip wherein the needle guard is slotted on one side 50 as to permit it to be mounted on a needle by lateral displacement.
(1) means for mounting substantially the entire guard for sliding motion along the needle towards the tip; and (2) a front portion secured to the mounting means and comprising at least one transverse shield for collapsing to form a barrier in front of the needle needle tip when the front portion is advanced past the tip wherein the needle guard is slotted on one side 50 as to permit it to be mounted on a needle by lateral displacement.
8. A needle guard as in claim 7 wherein the slot is under-cut so as to require that it be pressured into place on the needle and provide resistance to lateral removal thereafter.
9. A needle guard as in claim 7 comprising a complementary retention means in the form of a plate with a transverse slot and engagement means for fastening such plate to the needle guard, with its slot directed in the opposed direction to the slot on the basic needle guard.
10. A needle guard as in claim 9 wherein the plate communicates with the longitudinal arms to apply an inwardly directed resilient force to such arms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2034556 CA2034556A1 (en) | 1991-01-18 | 1991-01-18 | Needle-mounted hypodermic needle guard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2034556 CA2034556A1 (en) | 1991-01-18 | 1991-01-18 | Needle-mounted hypodermic needle guard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2034556A1 true CA2034556A1 (en) | 1992-07-19 |
Family
ID=4146869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2034556 Abandoned CA2034556A1 (en) | 1991-01-18 | 1991-01-18 | Needle-mounted hypodermic needle guard |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2034556A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8162904B2 (en) | 2006-03-29 | 2012-04-24 | Terumo Kabushiki Kaisha | Needle protector |
| EP1707230B1 (en) | 2001-02-26 | 2016-02-17 | B. Braun Melsungen AG | Injection needle with a protection element for the needle tip |
-
1991
- 1991-01-18 CA CA 2034556 patent/CA2034556A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1707230B1 (en) | 2001-02-26 | 2016-02-17 | B. Braun Melsungen AG | Injection needle with a protection element for the needle tip |
| US8162904B2 (en) | 2006-03-29 | 2012-04-24 | Terumo Kabushiki Kaisha | Needle protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |