CA2102333A1 - Disposal of medical needles - Google Patents
Disposal of medical needlesInfo
- Publication number
- CA2102333A1 CA2102333A1 CA002102333A CA2102333A CA2102333A1 CA 2102333 A1 CA2102333 A1 CA 2102333A1 CA 002102333 A CA002102333 A CA 002102333A CA 2102333 A CA2102333 A CA 2102333A CA 2102333 A1 CA2102333 A1 CA 2102333A1
- Authority
- CA
- Canada
- Prior art keywords
- needle
- sheath
- mounting
- base
- trocar
- 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
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/06—Body-piercing guide needles or the like
- A61M25/0612—Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/08—Accessories or related features not otherwise provided for
- A61B2090/0801—Prevention of accidental cutting or pricking
Abstract
ABSTRACT
A protective apparatus for used medical needles includes a protective sheath and a mechanism mounting the sheath on the needle for movement from a use position with the needle projecting from the end of the sheath to a protective position with the sheath surrounding the sharp end of the needle. The mounting mechanism includes a retainer that fixes the sheath in the protective position. Embodiments of the apparatus are useful for syringe needles, trocars and any other medical application.
A protective apparatus for used medical needles includes a protective sheath and a mechanism mounting the sheath on the needle for movement from a use position with the needle projecting from the end of the sheath to a protective position with the sheath surrounding the sharp end of the needle. The mounting mechanism includes a retainer that fixes the sheath in the protective position. Embodiments of the apparatus are useful for syringe needles, trocars and any other medical application.
Description
; ~ 2 1~ 1~ ' 3 ~ 3 `
,, .~,,, The present invention relates to the safe disposal of medical .:' , .
needles, for, example syringe needles and cannulation instruments commonly ', used in the health care field.
,. i Needles used with syringes to draw body fluids or gases, to inject various materials into pa~ients, or in the insertion of cannula, are commonly contaminated with infectious agents from the patients. Upon withdrawal of - ~j such a needle, the health care professional is left with the task of preventing ~ ~ j , the exposed needle from poking him or herself or those around them. Such a poke may transfer the infectious agent and the disease it causes to the health care worker.
.. . .
~ A protective cap is the protection commonly provided against the ,~ above risks. As such the location of the cap mustbe kept in mind and secured -~, while performing the procedure. Location of the cap may change for various , reasons. It may fall on the floor or become lost in the patient's bed sheets.
These delays increase the time the contaminated needle is exposed and ~ therefore the risk of poke increases. Also the need to move around with the `,'.2 contaminated needle in hand to retrieve the cap increases the risk of poke. It , also follows logicaliy that to retrieve a cap requires the eyes of the person ~, ~, . .
holding the needle to be removed from the needle, again, increasing chance of mishap.
~ ., .~ . . .
If cap retrieval is unsuccessful or impractical for any reason, other methods of disposal are in place but again do not seem to be without significant risk of needle poke. One such method is to have a cork board or the like attached to the needle tray for such needles to be removed by hand and .....
stuck into. This may leave a few uncapped contaminated needles on the tray P~
j~, which may fall out and, even if they remain, they must ultimately be handled ~
:,,.. j .
again for eventual disposal, again, increasing risk of needle poke. Another ,; ,~ , `/ 21~'~333 .,,i , .
, ;,1 2 ~ j .
method in place for disposal of uncapped needles is the sharps container which is used for eventual disposal of all sharp instruments capped or .;.--~
-~i uncapped. The container may be some distance away, even across the room, . 3 once again increasing movement with the contaminated needle and increasing . j~
- risk of poke.
., .~j Even if cap retrieval is successful and one intends to use the .~
.3 supplied cap for recapping the needle there are real risks. Although one should t never recap with two hands i.e. bring the needle towards the opposite hand while holding the cap, this seems to be the instinctual method unless a conscious effort is made to use the safer and currently taught one-handed method i.e. Ieaving the cap on another surface and bringing the needle to it.
Once the needle is inside the cap, it is pushed~down into the cap with the . ~, .
supporting surface as a stabilizer. This one-handed method is awkward at best and still has many of the aforesaid risks involved with it.
i In the placement of a cannula, for example for an intravenous . i; line, the metal support needle, known as a trocar, used to place the cannula is ., yet another contaminated and sharp by-product left in the hand of the person ~; performing the procedure. Such trocars are once again equipped only with a similar cap, leading to all of the above risk factors.
.. i i~ The present invention is concerned with a novel apparatus for mitigating the above problems.
According to the present invention, there is provided a prot~ctive apparatus for use with a medical needle of the type having a base and an . .
p~i, elongate shank with a penetrating point, said apparatus comprising:
a sheath configured to surround the needle;
mounting means for mounting the sheath on the needle for movement along the needle from a use position with the needle projecting ,. .
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beyond an end of the sheath to a protective position surrounding and ` ~ extending beyond the needle point; and retaining means for retaining the sheath in the protective position.
All of the risk factors related to the disposal of the contaminated ~i ~ needles and other cannulation devices with a simple one-cap/recap system can i be greatly reduced if not eliminated with the additional sliding protective ,. , :i~3 sheath on the instrumentation. The cap supplied with the needle may be ,. ~
discarded upon uncapping. The protective sheath may slide into place simultaneously with the withdrawal of the needle from the patient. Therefore the health care worker is never left holding an unprotected contaminated i, instrument. If the needle falls on the floor at this point it poses no threat as the ~, sheath is locked in place by the retaining means. ~The health care worker never -~, removes his/her eyes from the procedure until the sheath is in place. To put the sheath in place the user never has an unprotected hand near the sharp end of the instrument.
The sheath mounting means may be a component that mounts between the needle base and the syringe or withdrawal handle on which it is mounted. Alternatively, the mounting means may be made as one part with the needle base.
The retaining means may be a ratchet extending along the sheath, and a pawl on the mounting means, an arrangement which allows the sheath ,i to move only in the direction of the tip of the instrument.
In the accompanying drawings, which illustrate the conventional prior art and exemplary embodiments of the invention:
Figures 1, 2 and 3 illustrate the prior art needle capping system;
` ' Figure 4 is a side view of an embodiment of the present invention ,f, ' ! .
~ ~ as applied to a syringe and needle;
- ., . -, . -.
-'~" . , ~, ' . : ~
:
-.
., Figure 5 is a cross section of the apparatus illustrated in Figure 4;
Figure 6 is an isometric view of the sheath component of theapparatus of Figure 4;
Figure 7 is an end view of the sheath; -Figure 8 is an isometric view of the mounting component of the apparatus;
Figure 9 is a detail view of a retainer ratchet;
Figures 10, 1 1 and 12. which appear on the same sheet as Figures 1, 2 and 3, illustrate a prior art cannula and trocar capping system;
Figure 13 illustrates an embodiment of the invention for use with a cannula and trocar in a disassembled condition;
. Figure 14 is a view of the embodirn~ent of Figure 13 prepared for ti use;
,. ~
Figure 15 is a view like Figure 14 with the trocar sheathed; and Fi~ure 16 is a side view, partly in section of a further embodiment of the invention applied to a syringe and needle.
Referring to the accompanying drawings, Figures 1, 2 and 3 illustrate a prior art needle capping system for a syringe. This includes a syringe 10 of a conventional sort and the usual commercially supplied needle and cap assembly 12. The end of the syringe has a spigot 14 surrounded by a threaded cylindrical sleeve 16. The needle 18 of the assernbly 12 has a base 20 that engages on the spigot, inside the sleeve 16. This yields the assembly " . ~
~,' of a syringe and a capped needle as illustrated in Figure 2. For use, the cap ~`~ 22 is pulled off the needle 18 and is, in theory, set aside for recapping the ;, needle when it has bsen used. As noted above, there are a nuimber of uncertainties in this process. The exposed needle constitutes a hazard.
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.
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A protective sheath apparatus for resolving this problem is illustrated in Figures 4 through 9. The protective sheath apparatus includes a ~ cylindrical sheath 26 that fits over the syringe in the use position illustrated in - Figure 4 and may be pushed forward to a protective position surrounding the needle 18 and projecting beyond its sharp penetrating end. The apparatus also ; includes a mountin0 component 28 that is positioned within the sheath and mounts the sheath on the syringe and needle combination.
Inside the sheath are two diametrically opposed T-shaped tracks 30. These have, on their inner faces, ratchets 32 that extend substantially the - ~ full length of the tracks. Adjacent the bottom end of each track, also on the . .
- inner face, is a boss 34 acting as a stop to limit movement of the sheath on the mounting component.
The mounting component 28 includes a circular flange 36 with two, diametrically opposed T-slots 38. These slots engage slidably on tha T-tracks 30 to guide the movement of the sheath on the mounting component 28. Within each T-slot, along the radial innermost side, is a pawl 40 that engages the associated ratchet and will slide along that ratchet towards the stop boss 34. The arrangement is such howevar, that the reverse movement of the pawl along the ratchet is not possible.
On the top surface of the flange 36 are a spi00t 42 and a sleeve 44 that correspond to the spigot 14 and sleeve 16 on the end of the syringe.
Thus, the base 20 of the needle 18 may be coupled to the spigot 42 in the same way as it may be coupled to the spigot 14 on the syringe. On the bottom of the flange 36 is a base component 46 that corresponds in configuration to the base 20 of the needle 18 so that the base 46 may be ;~ ;~connected to the spigot 14 on the end of the syringe.
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21 0~3~3 In use, the conventional syringe 10 is connected to the mounting component 28 of the protective sheath apparatus and the conventional needle and cap assembly 12 is also connected to the mounting component 28. The protective sheath is in a retracted or use position surrounding the barrel of the syringe. When it is desired to use the syringe, the cap 22 of the needle is removed and may be discarded. Following use, the syringe is withdrawn, while the sheath is held in place. The sheath 26 thus moves forwards along the syringe until the pawl 40 engages the stop boss 34. At this point, the sheath surrounds and projects beyond the sharp end of the needle 18 and cannot be retracted from that position. The needle is thus prevented from coming into contac~ with other objects. For disposal, the needle and sheath may be removed as a unit from the syringe.
Another embodiment of th0 prior art is illustrated in Figures 10, 11 and 12. This is a cannula assembly 48 that includes a hollow cannula 50 a supporting trocar or needle 52 with a sharp leading end that projects out of the cannula for insertion purposes, and a base 54 on the trocar that is used to withdraw it from the cannula. A protective cap 56 is positioned over the cannula and trocar. When the cannula is to be inserted, the cap is removed, as shown in Figure 11. After insertion, the trocar 52 is withdrawn from the cannula as illustrated in Figure 12. This leaves the exposed, contaminated trocar 52 for disposal.
An embodiment of the invention usefut for this purpose is illustrated in Figures 13, 14 and 15.
The protective sheath apparatus 58 of this embodiment includes a sheath 60 that includes internal T-tracks, ratchets and stops that are of the same configuration as the T-tracks 30, ratchets 32 and stops 34 of the previously described embodiment. In this case, the sheath is somewhat longer , : :
,, .~,,, The present invention relates to the safe disposal of medical .:' , .
needles, for, example syringe needles and cannulation instruments commonly ', used in the health care field.
,. i Needles used with syringes to draw body fluids or gases, to inject various materials into pa~ients, or in the insertion of cannula, are commonly contaminated with infectious agents from the patients. Upon withdrawal of - ~j such a needle, the health care professional is left with the task of preventing ~ ~ j , the exposed needle from poking him or herself or those around them. Such a poke may transfer the infectious agent and the disease it causes to the health care worker.
.. . .
~ A protective cap is the protection commonly provided against the ,~ above risks. As such the location of the cap mustbe kept in mind and secured -~, while performing the procedure. Location of the cap may change for various , reasons. It may fall on the floor or become lost in the patient's bed sheets.
These delays increase the time the contaminated needle is exposed and ~ therefore the risk of poke increases. Also the need to move around with the `,'.2 contaminated needle in hand to retrieve the cap increases the risk of poke. It , also follows logicaliy that to retrieve a cap requires the eyes of the person ~, ~, . .
holding the needle to be removed from the needle, again, increasing chance of mishap.
~ ., .~ . . .
If cap retrieval is unsuccessful or impractical for any reason, other methods of disposal are in place but again do not seem to be without significant risk of needle poke. One such method is to have a cork board or the like attached to the needle tray for such needles to be removed by hand and .....
stuck into. This may leave a few uncapped contaminated needles on the tray P~
j~, which may fall out and, even if they remain, they must ultimately be handled ~
:,,.. j .
again for eventual disposal, again, increasing risk of needle poke. Another ,; ,~ , `/ 21~'~333 .,,i , .
, ;,1 2 ~ j .
method in place for disposal of uncapped needles is the sharps container which is used for eventual disposal of all sharp instruments capped or .;.--~
-~i uncapped. The container may be some distance away, even across the room, . 3 once again increasing movement with the contaminated needle and increasing . j~
- risk of poke.
., .~j Even if cap retrieval is successful and one intends to use the .~
.3 supplied cap for recapping the needle there are real risks. Although one should t never recap with two hands i.e. bring the needle towards the opposite hand while holding the cap, this seems to be the instinctual method unless a conscious effort is made to use the safer and currently taught one-handed method i.e. Ieaving the cap on another surface and bringing the needle to it.
Once the needle is inside the cap, it is pushed~down into the cap with the . ~, .
supporting surface as a stabilizer. This one-handed method is awkward at best and still has many of the aforesaid risks involved with it.
i In the placement of a cannula, for example for an intravenous . i; line, the metal support needle, known as a trocar, used to place the cannula is ., yet another contaminated and sharp by-product left in the hand of the person ~; performing the procedure. Such trocars are once again equipped only with a similar cap, leading to all of the above risk factors.
.. i i~ The present invention is concerned with a novel apparatus for mitigating the above problems.
According to the present invention, there is provided a prot~ctive apparatus for use with a medical needle of the type having a base and an . .
p~i, elongate shank with a penetrating point, said apparatus comprising:
a sheath configured to surround the needle;
mounting means for mounting the sheath on the needle for movement along the needle from a use position with the needle projecting ,. .
:~, s, ,}~
i, .e /"
:'.".'.' ' ~' " ,s ~
~ ~ - 2102333 . . .
... .
!~
beyond an end of the sheath to a protective position surrounding and ` ~ extending beyond the needle point; and retaining means for retaining the sheath in the protective position.
All of the risk factors related to the disposal of the contaminated ~i ~ needles and other cannulation devices with a simple one-cap/recap system can i be greatly reduced if not eliminated with the additional sliding protective ,. , :i~3 sheath on the instrumentation. The cap supplied with the needle may be ,. ~
discarded upon uncapping. The protective sheath may slide into place simultaneously with the withdrawal of the needle from the patient. Therefore the health care worker is never left holding an unprotected contaminated i, instrument. If the needle falls on the floor at this point it poses no threat as the ~, sheath is locked in place by the retaining means. ~The health care worker never -~, removes his/her eyes from the procedure until the sheath is in place. To put the sheath in place the user never has an unprotected hand near the sharp end of the instrument.
The sheath mounting means may be a component that mounts between the needle base and the syringe or withdrawal handle on which it is mounted. Alternatively, the mounting means may be made as one part with the needle base.
The retaining means may be a ratchet extending along the sheath, and a pawl on the mounting means, an arrangement which allows the sheath ,i to move only in the direction of the tip of the instrument.
In the accompanying drawings, which illustrate the conventional prior art and exemplary embodiments of the invention:
Figures 1, 2 and 3 illustrate the prior art needle capping system;
` ' Figure 4 is a side view of an embodiment of the present invention ,f, ' ! .
~ ~ as applied to a syringe and needle;
- ., . -, . -.
-'~" . , ~, ' . : ~
:
-.
., Figure 5 is a cross section of the apparatus illustrated in Figure 4;
Figure 6 is an isometric view of the sheath component of theapparatus of Figure 4;
Figure 7 is an end view of the sheath; -Figure 8 is an isometric view of the mounting component of the apparatus;
Figure 9 is a detail view of a retainer ratchet;
Figures 10, 1 1 and 12. which appear on the same sheet as Figures 1, 2 and 3, illustrate a prior art cannula and trocar capping system;
Figure 13 illustrates an embodiment of the invention for use with a cannula and trocar in a disassembled condition;
. Figure 14 is a view of the embodirn~ent of Figure 13 prepared for ti use;
,. ~
Figure 15 is a view like Figure 14 with the trocar sheathed; and Fi~ure 16 is a side view, partly in section of a further embodiment of the invention applied to a syringe and needle.
Referring to the accompanying drawings, Figures 1, 2 and 3 illustrate a prior art needle capping system for a syringe. This includes a syringe 10 of a conventional sort and the usual commercially supplied needle and cap assembly 12. The end of the syringe has a spigot 14 surrounded by a threaded cylindrical sleeve 16. The needle 18 of the assernbly 12 has a base 20 that engages on the spigot, inside the sleeve 16. This yields the assembly " . ~
~,' of a syringe and a capped needle as illustrated in Figure 2. For use, the cap ~`~ 22 is pulled off the needle 18 and is, in theory, set aside for recapping the ;, needle when it has bsen used. As noted above, there are a nuimber of uncertainties in this process. The exposed needle constitutes a hazard.
,, ~ ..
``!
~ . .
':~j"" ' ' ' ~ ~ .
' ': , : :
.
"', . . . .
/ 2~%~33 .
A protective sheath apparatus for resolving this problem is illustrated in Figures 4 through 9. The protective sheath apparatus includes a ~ cylindrical sheath 26 that fits over the syringe in the use position illustrated in - Figure 4 and may be pushed forward to a protective position surrounding the needle 18 and projecting beyond its sharp penetrating end. The apparatus also ; includes a mountin0 component 28 that is positioned within the sheath and mounts the sheath on the syringe and needle combination.
Inside the sheath are two diametrically opposed T-shaped tracks 30. These have, on their inner faces, ratchets 32 that extend substantially the - ~ full length of the tracks. Adjacent the bottom end of each track, also on the . .
- inner face, is a boss 34 acting as a stop to limit movement of the sheath on the mounting component.
The mounting component 28 includes a circular flange 36 with two, diametrically opposed T-slots 38. These slots engage slidably on tha T-tracks 30 to guide the movement of the sheath on the mounting component 28. Within each T-slot, along the radial innermost side, is a pawl 40 that engages the associated ratchet and will slide along that ratchet towards the stop boss 34. The arrangement is such howevar, that the reverse movement of the pawl along the ratchet is not possible.
On the top surface of the flange 36 are a spi00t 42 and a sleeve 44 that correspond to the spigot 14 and sleeve 16 on the end of the syringe.
Thus, the base 20 of the needle 18 may be coupled to the spigot 42 in the same way as it may be coupled to the spigot 14 on the syringe. On the bottom of the flange 36 is a base component 46 that corresponds in configuration to the base 20 of the needle 18 so that the base 46 may be ;~ ;~connected to the spigot 14 on the end of the syringe.
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21 0~3~3 In use, the conventional syringe 10 is connected to the mounting component 28 of the protective sheath apparatus and the conventional needle and cap assembly 12 is also connected to the mounting component 28. The protective sheath is in a retracted or use position surrounding the barrel of the syringe. When it is desired to use the syringe, the cap 22 of the needle is removed and may be discarded. Following use, the syringe is withdrawn, while the sheath is held in place. The sheath 26 thus moves forwards along the syringe until the pawl 40 engages the stop boss 34. At this point, the sheath surrounds and projects beyond the sharp end of the needle 18 and cannot be retracted from that position. The needle is thus prevented from coming into contac~ with other objects. For disposal, the needle and sheath may be removed as a unit from the syringe.
Another embodiment of th0 prior art is illustrated in Figures 10, 11 and 12. This is a cannula assembly 48 that includes a hollow cannula 50 a supporting trocar or needle 52 with a sharp leading end that projects out of the cannula for insertion purposes, and a base 54 on the trocar that is used to withdraw it from the cannula. A protective cap 56 is positioned over the cannula and trocar. When the cannula is to be inserted, the cap is removed, as shown in Figure 11. After insertion, the trocar 52 is withdrawn from the cannula as illustrated in Figure 12. This leaves the exposed, contaminated trocar 52 for disposal.
An embodiment of the invention usefut for this purpose is illustrated in Figures 13, 14 and 15.
The protective sheath apparatus 58 of this embodiment includes a sheath 60 that includes internal T-tracks, ratchets and stops that are of the same configuration as the T-tracks 30, ratchets 32 and stops 34 of the previously described embodiment. In this case, the sheath is somewhat longer , : :
2 ~ ~ 2 ~') .3 3 to accommodate the longer length of the cannula assembly. A mounting component 62 slides in the sheath. It has a flange 64 with T-slots and pawls like the T-slots 38 and pawls 40 of the previously described embodiment. The top of the mounting component 62 has at the centre a resilient rubber spigot 66 and a resilient rubber sleeve 68 that engage in the recess in the base of the trocar and grip its outside periphery.
Secured to the bottom side of the mounting component 62 is an elon~ate handle 70 that extends from the component through the protective sheath 60 so that the trocar may readily be withdrawn into the sheath.
In use of this sheath assembly, the complete cannula and trocar assembly is fitted onto the top of the mounting component, with the protective sheath fully withdrawn. The cap 56 is then remo~ved and the cannula inserted.
Then, by gripping the handle 70 and the sheath 60, the trocar may be withdrawn into the sheath and released from the cannula in a fully protected position. ~ ~-A further embodiment of the invention, also for use wi~h a syringe, is illustrated in Figure 16. This embodiment is similar to the embodiment of Figures 4 throu~h 9, but in this case the needle base and the mounting component are integrated so that the user will have only two components to assemble, the conventional syringe and the needle and sheath assembly 74. The base 76 of the needle carries a flange 78 like the flange 36 -~
of the first embodiment. ;
A similar embodiment may be constructed for use with a cannula assembly, with the trocar, mounting component and handle all integrated. It is also possible to make embodiments for use with cannulae where various of the parts are separate and attachable.
' ' , ~ ' ' -21~2~33 While certain embodiments of the present invention have been described in the foregoing, it is to be understood that other embodiments are possible without departing from the invention and are intended to be included within the scope of the appended claims.
- . ~
Secured to the bottom side of the mounting component 62 is an elon~ate handle 70 that extends from the component through the protective sheath 60 so that the trocar may readily be withdrawn into the sheath.
In use of this sheath assembly, the complete cannula and trocar assembly is fitted onto the top of the mounting component, with the protective sheath fully withdrawn. The cap 56 is then remo~ved and the cannula inserted.
Then, by gripping the handle 70 and the sheath 60, the trocar may be withdrawn into the sheath and released from the cannula in a fully protected position. ~ ~-A further embodiment of the invention, also for use wi~h a syringe, is illustrated in Figure 16. This embodiment is similar to the embodiment of Figures 4 throu~h 9, but in this case the needle base and the mounting component are integrated so that the user will have only two components to assemble, the conventional syringe and the needle and sheath assembly 74. The base 76 of the needle carries a flange 78 like the flange 36 -~
of the first embodiment. ;
A similar embodiment may be constructed for use with a cannula assembly, with the trocar, mounting component and handle all integrated. It is also possible to make embodiments for use with cannulae where various of the parts are separate and attachable.
' ' , ~ ' ' -21~2~33 While certain embodiments of the present invention have been described in the foregoing, it is to be understood that other embodiments are possible without departing from the invention and are intended to be included within the scope of the appended claims.
- . ~
Claims
(1) A protective apparatus for use with a medical needle of the type having a base and an elongate shank with a penetrating point, said apparatus comprising:
a sheath configured to surround the needle;
mounting means for mounting the sheath on the needle for movement along the needle from a use position with the needle projecting beyond an end of the sheath to a protective position surrounding and extending beyond the needle point; and retaining means for retaining the sheath in the protective position.
(2) Apparatus according to Claim 1 wherein the mounting means comprise means for mounting the sheath slidably on the needle base.
(3) Apparatus according to Claim 1 wherein the retaining means comprise ratchet means mounted on the sheath and ratchet engagement means mounted on the needle base for preventing movement of the sheath from the protective position towards the use position.
(4) Apparatus according to Claim 1 wherein the needle is a syringe needle and the base comprises means for mounting the needle on a needle mounting spigot of a syringe, the mounting means comprising means engageable with the needle mounting spigot of the syringe and with the needle base for mounting the needle base on the spigot.
(5) Apparatus according to Claim 1 wherein the needle is a syringe needle, the base comprises means for mounting the needle on a needle mounting spigot of a syringe and the sheath mounting means are integral with the base.
(6) Apparatus according to Claim 1 wherein the needle is a trocar for use with a cannula, the apparatus including an elongate handle extending from the sheath mounting means for withdrawing the trocar from the cannula and into the sheath.
(7) Apparatus according to Claim 1 wherein the needle is a trocar for use with a cannula, the sheath mounting means being engageable with the trocar base, the sheath mounting means being integral with an elongate handle for withdrawing the trocar from the cannula and into the sheath.
(8) Apparatus according to Claim 1 wherein the needle is a trocar for use with a cannula, and the base includes the sheath mounting means and an elongate handle for withdrawing the trocar from the cannula and into the sheath.
a sheath configured to surround the needle;
mounting means for mounting the sheath on the needle for movement along the needle from a use position with the needle projecting beyond an end of the sheath to a protective position surrounding and extending beyond the needle point; and retaining means for retaining the sheath in the protective position.
(2) Apparatus according to Claim 1 wherein the mounting means comprise means for mounting the sheath slidably on the needle base.
(3) Apparatus according to Claim 1 wherein the retaining means comprise ratchet means mounted on the sheath and ratchet engagement means mounted on the needle base for preventing movement of the sheath from the protective position towards the use position.
(4) Apparatus according to Claim 1 wherein the needle is a syringe needle and the base comprises means for mounting the needle on a needle mounting spigot of a syringe, the mounting means comprising means engageable with the needle mounting spigot of the syringe and with the needle base for mounting the needle base on the spigot.
(5) Apparatus according to Claim 1 wherein the needle is a syringe needle, the base comprises means for mounting the needle on a needle mounting spigot of a syringe and the sheath mounting means are integral with the base.
(6) Apparatus according to Claim 1 wherein the needle is a trocar for use with a cannula, the apparatus including an elongate handle extending from the sheath mounting means for withdrawing the trocar from the cannula and into the sheath.
(7) Apparatus according to Claim 1 wherein the needle is a trocar for use with a cannula, the sheath mounting means being engageable with the trocar base, the sheath mounting means being integral with an elongate handle for withdrawing the trocar from the cannula and into the sheath.
(8) Apparatus according to Claim 1 wherein the needle is a trocar for use with a cannula, and the base includes the sheath mounting means and an elongate handle for withdrawing the trocar from the cannula and into the sheath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002102333A CA2102333A1 (en) | 1993-11-03 | 1993-11-03 | Disposal of medical needles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002102333A CA2102333A1 (en) | 1993-11-03 | 1993-11-03 | Disposal of medical needles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2102333A1 true CA2102333A1 (en) | 1995-05-04 |
Family
ID=4152061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002102333A Abandoned CA2102333A1 (en) | 1993-11-03 | 1993-11-03 | Disposal of medical needles |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2102333A1 (en) |
-
1993
- 1993-11-03 CA CA002102333A patent/CA2102333A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |