US20160271328A1 - Anesthetic Syringe - Google Patents
Anesthetic Syringe Download PDFInfo
- Publication number
- US20160271328A1 US20160271328A1 US15/075,277 US201615075277A US2016271328A1 US 20160271328 A1 US20160271328 A1 US 20160271328A1 US 201615075277 A US201615075277 A US 201615075277A US 2016271328 A1 US2016271328 A1 US 2016271328A1
- Authority
- US
- United States
- Prior art keywords
- syringe assembly
- barrel
- cartridge
- needle
- syringe
- 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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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61M5/178—Syringes
- A61M5/31—Details
- A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
- A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
- A61M5/3159—Dose expelling manners
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- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
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- A61C5/60—Devices specially adapted for pressing or mixing capping or filling materials, e.g. amalgam presses
- A61C5/62—Applicators, e.g. syringes or guns
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- A61M2005/31598—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms comprising means for injection of two or more media, e.g. by mixing having multiple telescopically sliding coaxial pistons encompassing volumes for components to be mixed
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- A61M5/488—Limiting injection pressure
Definitions
- the present invention generally relates to devices for injecting liquid medications from prefilled cartridges and more particularly to single use disposable syringe assemblies for injecting local anesthetics.
- a re-usable breech-loading, metallic, cartridge-type syringe assembly is used to inject the anesthetic.
- the dental syringe assembly includes a syringe, a cartridge, and a needle.
- the syringe may be constructed of chrome-plated brass and stainless steel and may include a needle adapter, a syringe barrel, a plunger rod, a finger grip, and a thumb ring.
- the syringe must be sterilized before each use.
- the cartridge or carpule is a vial containing a local anesthetic among other ingredients.
- the cartridge may include a glass cylinder, a piston, and a rubber diaphragm held in position by an aluminum band. The cartridge is usually wiped with alcohol prior to being loaded into the syringe.
- the needle of the dental syringe permits local anesthetic to travel from the dental cartridge into tissue surrounding the needle tip. Needles may be pre-sterilized and disposable.
- the needle may consist of a single piece of metal tubing surrounded by a plastic or a metal needle hub attached to the needle adapter of the syringe.
- Assembly of a dental syringe often requires removing a sterilized syringe from its container and placing an alcohol wiped cartridge into the syringe with the plunger rod of the syringe fully retracted.
- the rubber diaphragm on a distal end of the cartridge is inserted into the syringe first and the plunger rod engages the piston positioned at a proximal end of the cartridge.
- the syringe includes an access needle for puncturing the cartridge.
- the needle assembly including a needle and protective cap may be secured to the syringe. The protective cap is removed from the needle and the syringe is ready for use
- the needle assembly After the assembled dental syringe is used, the needle assembly must be recapped, disconnected from the syringe and disposed in a sharps container, and the cartridge must be removed and disposed in a biohazard bag or sharps container. Thereafter, the syringe may be sterilized for its next use.
- the present invention includes a syringe assembly for dispensing medicine from a cartridge having a diaphragm and a piston opposite the diaphragm.
- the assembly comprises a barrel having a hollow interior, an open proximal end extending into the hollow interior, a closed distal end opposite the proximal end, and an outlet adapted for fluid communication with a delivery needle for delivering medicine to tissue of a subject.
- the assembly also includes a cartridge receiver slidably receivable in the hollow interior of the barrel.
- the cartridge receiver includes an interior space sized and shaped for receiving the cartridge, an access needle extending into the interior space of the cartridge receiver for puncturing the diaphragm of the cartridge received in the interior space to access medicine.
- the access needle directs fluid to the barrel outlet when the cartridge receiver is received in the hollow interior of the barrel.
- the cartridge receiver further comprises a plunger rod movable into the interior space of the cartridge receiver for engaging the piston of the cartridge received in the receiver to selectively force medicine in the cartridge through the access needle.
- FIG. 1 a is a side elevation in partial section of a syringe assembly of a first embodiment of the present invention shown in a first position;
- FIG. 1 b is a side elevation in partial section of the syringe assembly of FIG. 1 a shown in a second position;
- FIG. 1 c is a side elevation in partial section of the syringe assembly of FIG. 1 a shown in a third position;
- FIG. 2 is a side elevation in partial section of the syringe assembly of a second embodiment
- FIG. 3 is a side elevation in partial section of the syringe assembly of a third and fourth embodiment
- FIGS. 4 a and 4 b are schematic cross sections of the assemblies of the third and fourth embodiments.
- FIG. 5 is a side elevation a syringe assembly of a fifth embodiment of the present invention.
- FIG. 6 is a side elevation of a syringe assembly of a sixth embodiment of the present invention.
- FIGS. 7-10, 11 a - d, 12 , and 13 are side elevations of various alternative embodiments of the present invention.
- FIG. 14 a - c are perspectives of a syringe assembly having a needle guard
- FIG. 15 is a side elevation of a needle of one embodiment of the present invention.
- FIG. 16 is a side elevation of a needle of an alternate embodiment of the present invention.
- FIG. 17 is a side elevation of a syringe assembly of another embodiment of the present invention.
- FIG. 18 is a side elevation of a thumb ring of a syringe assembly of another embodiment of the present invention.
- FIG. 19 is a side elevation of a syringe assembly of yet another embodiment of the present invention.
- FIG. 20 is a schematic elevation of a portion of a syringe assembly of the present invention.
- a syringe assembly of a first embodiment is designated in its entirety by the reference number 30 .
- the syringe assembly 30 includes a barrel 32 having an inner wall 34 defining a hollow interior 36 having a closed distal end 38 and an open proximal end (not shown) opposite the closed end.
- An outlet 42 is provided in the closed end 38 of the barrel 32 .
- a conventional deliver needle may be attached to the outlet 42 .
- the syringe assembly 30 includes a cartridge receiver, generally designated by 50 , slidably received in the barrel 32 .
- the cartridge receiver 50 includes an interior wall 52 defining a interior space 54 sized and shaped for receiving a conventional cartridge C containing medicine (e.g., anesthetic).
- the cartridge receiver 50 includes a removable distal cap or cover 56 having an access needle 58 .
- the access needle 58 includes a distal delivery point 60 and a sharp proximal access point 62 adapted to penetrate a diaphragm D of the cartridge C.
- An elastomeric seal 64 surrounds the cap 56 for sealingly engaging the inner wall 34 of the barrel 32 .
- An outer surface 70 of the cartridge receiver 50 includes spaced ribs 72 for guiding the receiver as it reciprocates in the barrel 32 .
- a proximal end of the receiver 50 includes scalloped sides 74 for receiving fingers of the user. Further, the proximal end of the receiver 50 includes an outer thumb ring 76 that is used when the syringe assembly 30 is readied for injection as will be explained in detail below.
- a plunger rod 80 extends inside the cartridge receiver and engages a piston P on the cartridge C.
- a proximal end of the plunger rod 80 includes a thumb ring 82 .
- the plunger rod 80 extends through an opening 84 in the thumb ring 76 of the cartridge receiver 50 .
- a user prepares the cartridge C for use by pushing the plunger rod 80 distally to engage the access tip 60 of the access needle 58 with the diaphragm D of the cartridge C. Once in this position, the cartridge receiver 50 may be drawn proximally relative to the plunger rod 80 until the thumb rings 82 , 76 of the plunger rod 80 and cartridge receiver 50 , respectively, overlap as shown in FIG. 1 c.
- FIG. 2 A second embodiment of a syringe assembly 30 ′ of the present invention is shown in FIG. 2 .
- the cartridge receiver 50 has a unitary cap and seal 64 .
- an access adapter 90 having an access needle 58 is positioned on the cartridge C.
- the barrel 32 is provided with a finger flange 92 and a luer lock tip 94 . Because other physical characteristics of this embodiment are similar to those previously described, they will not be described in further detail.
- the cartridge receiver 50 is adapted for receiving two cartridges C simultaneously. Further, the third embodiment has two rods 80 . Other features of the third embodiment are similar to those of the first embodiment described above and will not be described in further detail.
- a schematic cross section of the syringe assembly of the third embodiment is shown in FIG. 4 a .
- the cartridge receiver 50 may be adapted to receive three cartridges C as shown in a schematic cross section of the syringe assembly of a fourth embodiment shown in FIG. 4 b .
- This embodiment includes three access needles (not shown) extending through the cap of the receiver and three plunger rods (not shown) adapted to engage the respective seals of the cartridges C.
- Those skilled in the art will appreciate that still other embodiments adapted for receiving still more cartridges are also within the scope of the present invention.
- a syringe assembly 30 ′′ includes a polished or convex annular ring 100 surrounding an exterior wall of the barrel 32 ′′.
- This convex ring 100 magnifies the contents of the barrel 32 ′′.
- a user can more readily identify aspirate or flashback flowing backward through the delivery needle 102 and into the syringe assembly 30 ′′.
- this embodiment is generally similar to those described above, they will not be described.
- FIG. 6 illustrates a sixth embodiment of a syringe assembly 30 ′′′ of the present invention.
- a syringe assembly 30 ′′′ of the present invention In some instances patients become anxious upon seeing a needle of the syringe. To prevent the patient from seeing the needle 102 , an elastomeric sleeve 110 is fastened over the delivery needle of the syringe assembly 30 ′′′. When the syringe assembly 30 ′′′ is armed, the plunger rod 80 ′′′ forces the delivery needle 102 through the elastomeric sheath 110 , exposing the needle for use. Other aspects of this embodiment are similar to those described above and will not be described.
- a seventh embodiment of a syringe assembly includes a quick release coupling 122 that holds the needle 102 in place.
- the coupling 122 is disconnected so the needle 102 can be discarded.
- releasing the coupling 122 can operate to eject the entire sub-assembly. It is envisioned that an element could be included on a sharps container for disconnecting the coupling 122 .
- a barrel 132 separates so the needle 102 and cartridge C can be discarded.
- a plunger rod 142 separates to release the needle and cartridge C.
- a sub-assembly generally designated by 152 , comprising the needle and a cartridge (not shown) separates from the barrel 154 so the needle 102 and cartridge C can be discarded.
- the sub-assembly 152 may be fastened to the barrel 154 in any conventional way, such as by a press fit connection as shown in FIG. 10 .
- the sub-assembly 152 may be fastened to the barrel 154 by a pin 156 that can be removed as shown in FIGS. 11 a - d.
- the sub-assembly 152 is threadably connected to the barrel 154 of the syringe assembly 150 .
- the disposable portion need not only include a distal portion of a barrel, but may also include a longer portion of the barrel 160 as in a syringe assembly, generally designated by 162 in FIG. 13 .
- a distal end of the barrel may include flexible leaves (similar to the leaves described below with respect to FIG. 18 ) so the sub-assembly can be ejected through the barrel by pushing the plunger rod. It is envisioned that a spring could be incorporated in the syringe assembly to aid ejection of the sub-assembly.
- the syringe assembly designated by 162 in FIG. 13 also includes other features of interest.
- the syringe assembly 162 includes a needle guard 164 extending from the barrel 160 to a position beyond the needle 102 . It is envisioned that this guard 164 can be folded so its distal end lies adjacent a finger flange 166 when the assembly is ready to use. When injection is complete, the guard 164 could be released permitting it to return to the unfolded configuration in which it could provide protection against inadvertent needle sticks. Further, the guard 164 may be made in a contrasting color so that flashback or aspirate is more apparent. The contrasting colors may include phosphorescent coloring. Alternatively, the barrel may be light transmitting or include back lighting or front lighting to further improve visibility of aspirate or flashback.
- FIGS. 14 a - c illustrate an alternate embodiment of a syringe assembly, generally designated by 170 , having a needle guard 172 .
- the guard 172 is pulled proximally onto the syringe body 174 .
- the guard is pushed distally over the needle 102 as shown in FIG. 14 c .
- needle guards aid in preventing inadvertent needle stabs.
- FIG. 15 illustrates an embodiment of a delivery needle 180 having multiple openings 182 along its length for spreading the anesthetic over a broader area of tissue.
- FIG. 16 illustrates yet another embodiment, in which thin fibers 184 are extended from the needle 186 . The fibers 184 fan out and cause multiple punctures in the patient's tissue that may be flooded with anesthetic so the tissue receives anesthetic over a broad area.
- the fibers 184 may be made more flexible than the delivery needle but have sufficient rigidity to allow them to penetrate the tissue as they extend out of the needle 186 .
- the fibers are solid rather than hollow, leaving puncture holes that can be flooded with anesthetic. It is believed that multiple injection sites could reduce discomfort by reducing forces applied to each site.
- the syringe assembly may be colored to blend with the user's gloves, thereby camouflaging the syringe assembly.
- the delivery needle 102 may be configured to extend perpendicular to a primary axis A of the syringe assembly, generally designated by 190 , as illustrated in FIG. 17 . This form factor may mimic other dental tools, such as water syringes, to reduce a likelihood recognition by the patient.
- FIG. 18 illustrates an automatically sizing thumb ring 200 that may be incorporated in any of the embodiments described above.
- the thumb ring 200 includes an elastomeric panel 202 extending across its central opening 204 .
- the panel 202 includes spaced radially extending slots 206 , forming leaves 208 in the panel that are separately deformed when the user's thumb is inserted in the ring 200 .
- the leaves 208 of the panel 202 are biased toward the thumb, providing an appropriate fit.
- the thumb ring may be comprised of two halves ratcheted together. In one embodiment, ratchet teeth on one half operatively engage ratchet teeth on the other half of the thumb ring.
- the two halves may be compressed toward one another and locked via the ratchets to reduce the internal size of the thumb ring. Similarly, the two halves may be expanded and locked via ratchets to increase the internal size of the thumb ring.
- This automatically sizing thumb ring permits users having smaller and weaker hands to use the syringe.
- the ratchet locking mechanism of the thumb ring allows the user to both advance and retract the plunger rod without repositioning the hand.
- An alternate embodiment of a syringe assembly designated generally by 210 in FIG. 19 , includes a plunger rod 212 having an elastomeric foam ball 214 in place of the conventional thumb ring.
- Elastomeric ball 214 may have any size and shape to conform to a user's hand, such as round or oval. It is believed such a configuration would provide a less intimidating form factor and provide a more universal fit for users.
- the elastomeric foam ball and plunger rod are replaced with an elastomeric hollow bulb that is squeezed to pressurize the anesthetic so that it is ejected from the delivery needle 102 . It is believed this alternate embodiment would provide a smooth and continuous flow of anesthetic to the patient because the bulb would dampen pressure changes, as well as provide a less intimidating form factor and a more universal fit for users.
- FIG. 20 shows an accumulator element, generally designated by 220 , that could be incorporated in different locations of a syringe assembly.
- the element 220 is used along a hollow passage to minimize pressure changes.
- a hole 222 is provided along the passage and an elastomeric balloon or bulb 224 is positioned around the area of the passage having the hole.
- the balloon or bulb 224 provides an elastomeric fluid accumulator.
- the accumulator expands and contracts to absorb and release fluid as pressure varies in the passage.
- anesthetic may be delivered at a more constant pressure, thereby potentially reducing discomfort of the patient.
- a damper could be formed along the plunger rod to accomplish a similar result.
Abstract
A syringe assembly for dispensing medicine from a cartridge having a diaphragm and a piston opposite the diaphragm. The assembly includes a barrel having a hollow interior, an open proximal end, a closed distal end, and an outlet. The assembly also includes a cartridge receiver slidably receivable in the hollow interior of the barrel. The receiver includes an interior space for receiving the cartridge, an access needle extending into the interior space for puncturing the diaphragm of the cartridge. The access needle directs fluid to the barrel outlet. The cartridge receiver includes a plunger rod movable into the interior space of the cartridge receiver for engaging the piston of the cartridge to selectively force medicine in the cartridge through the access needle.
Description
- This application claims priority to U.S. Patent Application 61/471,903 filed Apr. 5, 2011, which is hereby incorporated by reference in its entirety.
- The present invention generally relates to devices for injecting liquid medications from prefilled cartridges and more particularly to single use disposable syringe assemblies for injecting local anesthetics.
- Many dental procedures use anesthetic to numb an area of a patient's mouth to reduce pain and discomfort a patient may feel. Conventionally, a re-usable breech-loading, metallic, cartridge-type syringe assembly is used to inject the anesthetic. The dental syringe assembly includes a syringe, a cartridge, and a needle. The syringe may be constructed of chrome-plated brass and stainless steel and may include a needle adapter, a syringe barrel, a plunger rod, a finger grip, and a thumb ring. Typically, the syringe must be sterilized before each use.
- Generally, the cartridge or carpule is a vial containing a local anesthetic among other ingredients. The cartridge may include a glass cylinder, a piston, and a rubber diaphragm held in position by an aluminum band. The cartridge is usually wiped with alcohol prior to being loaded into the syringe.
- The needle of the dental syringe permits local anesthetic to travel from the dental cartridge into tissue surrounding the needle tip. Needles may be pre-sterilized and disposable. The needle may consist of a single piece of metal tubing surrounded by a plastic or a metal needle hub attached to the needle adapter of the syringe.
- Assembly of a dental syringe often requires removing a sterilized syringe from its container and placing an alcohol wiped cartridge into the syringe with the plunger rod of the syringe fully retracted. The rubber diaphragm on a distal end of the cartridge is inserted into the syringe first and the plunger rod engages the piston positioned at a proximal end of the cartridge. The syringe includes an access needle for puncturing the cartridge. As the plunger rod advances, anesthetic is forced out of the cartridge toward a need assembly. The needle assembly including a needle and protective cap may be secured to the syringe. The protective cap is removed from the needle and the syringe is ready for use
- After the assembled dental syringe is used, the needle assembly must be recapped, disconnected from the syringe and disposed in a sharps container, and the cartridge must be removed and disposed in a biohazard bag or sharps container. Thereafter, the syringe may be sterilized for its next use.
- In one aspect, the present invention includes a syringe assembly for dispensing medicine from a cartridge having a diaphragm and a piston opposite the diaphragm. The assembly comprises a barrel having a hollow interior, an open proximal end extending into the hollow interior, a closed distal end opposite the proximal end, and an outlet adapted for fluid communication with a delivery needle for delivering medicine to tissue of a subject. The assembly also includes a cartridge receiver slidably receivable in the hollow interior of the barrel. The cartridge receiver includes an interior space sized and shaped for receiving the cartridge, an access needle extending into the interior space of the cartridge receiver for puncturing the diaphragm of the cartridge received in the interior space to access medicine. The access needle directs fluid to the barrel outlet when the cartridge receiver is received in the hollow interior of the barrel. The cartridge receiver further comprises a plunger rod movable into the interior space of the cartridge receiver for engaging the piston of the cartridge received in the receiver to selectively force medicine in the cartridge through the access needle.
- Other aspects of the present invention will be apparent in view of the following description and claims.
-
FIG. 1a is a side elevation in partial section of a syringe assembly of a first embodiment of the present invention shown in a first position; -
FIG. 1b is a side elevation in partial section of the syringe assembly ofFIG. 1a shown in a second position; -
FIG. 1c is a side elevation in partial section of the syringe assembly ofFIG. 1a shown in a third position; -
FIG. 2 is a side elevation in partial section of the syringe assembly of a second embodiment; -
FIG. 3 is a side elevation in partial section of the syringe assembly of a third and fourth embodiment; -
FIGS. 4a and 4b are schematic cross sections of the assemblies of the third and fourth embodiments; -
FIG. 5 is a side elevation a syringe assembly of a fifth embodiment of the present invention; -
FIG. 6 is a side elevation of a syringe assembly of a sixth embodiment of the present invention; -
FIGS. 7-10, 11 a-d, 12, and 13 are side elevations of various alternative embodiments of the present invention; -
FIG. 14a-c are perspectives of a syringe assembly having a needle guard; -
FIG. 15 is a side elevation of a needle of one embodiment of the present invention; -
FIG. 16 is a side elevation of a needle of an alternate embodiment of the present invention; -
FIG. 17 is a side elevation of a syringe assembly of another embodiment of the present invention; -
FIG. 18 is a side elevation of a thumb ring of a syringe assembly of another embodiment of the present invention; -
FIG. 19 is a side elevation of a syringe assembly of yet another embodiment of the present invention; and -
FIG. 20 is a schematic elevation of a portion of a syringe assembly of the present invention. - Corresponding reference characters indicate corresponding parts throughout the drawings.
- Referring to
FIG. 1 a, a syringe assembly of a first embodiment is designated in its entirety by thereference number 30. Thesyringe assembly 30 includes abarrel 32 having aninner wall 34 defining ahollow interior 36 having a closeddistal end 38 and an open proximal end (not shown) opposite the closed end. Anoutlet 42 is provided in the closedend 38 of thebarrel 32. A conventional deliver needle may be attached to theoutlet 42. - In addition, the
syringe assembly 30 includes a cartridge receiver, generally designated by 50, slidably received in thebarrel 32. Thecartridge receiver 50 includes aninterior wall 52 defining ainterior space 54 sized and shaped for receiving a conventional cartridge C containing medicine (e.g., anesthetic). Thecartridge receiver 50 includes a removable distal cap orcover 56 having anaccess needle 58. Theaccess needle 58 includes adistal delivery point 60 and a sharpproximal access point 62 adapted to penetrate a diaphragm D of the cartridge C. Anelastomeric seal 64 surrounds thecap 56 for sealingly engaging theinner wall 34 of thebarrel 32. Anouter surface 70 of thecartridge receiver 50 includes spacedribs 72 for guiding the receiver as it reciprocates in thebarrel 32. A proximal end of thereceiver 50 includes scallopedsides 74 for receiving fingers of the user. Further, the proximal end of thereceiver 50 includes anouter thumb ring 76 that is used when thesyringe assembly 30 is readied for injection as will be explained in detail below. - A
plunger rod 80 extends inside the cartridge receiver and engages a piston P on the cartridge C. A proximal end of theplunger rod 80 includes athumb ring 82. Theplunger rod 80 extends through anopening 84 in thethumb ring 76 of thecartridge receiver 50. As shown inFIG. 1 b, a user prepares the cartridge C for use by pushing theplunger rod 80 distally to engage theaccess tip 60 of theaccess needle 58 with the diaphragm D of the cartridge C. Once in this position, thecartridge receiver 50 may be drawn proximally relative to theplunger rod 80 until the thumb rings 82, 76 of theplunger rod 80 andcartridge receiver 50, respectively, overlap as shown inFIG. 1 c. This action drives the piston P distally in the cartridge C, forcing medicine through theaccess needle 58 and into thehollow interior 36 of thebarrel 32. Once in this position, thecartridge receiver 50 andplunger rod 80 are moved together in a distal direction to eject the medicine from thebarrel 32 through theoutlet 42 and into a delivery needle (not shown). - A second embodiment of a
syringe assembly 30′ of the present invention is shown inFIG. 2 . Rather than having aseparate cap 56, thecartridge receiver 50 has a unitary cap andseal 64. Further, anaccess adapter 90 having anaccess needle 58 is positioned on the cartridge C. Thebarrel 32 is provided with afinger flange 92 and aluer lock tip 94. Because other physical characteristics of this embodiment are similar to those previously described, they will not be described in further detail. - In a third embodiment of the present invention shown in
FIG. 3 , thecartridge receiver 50 is adapted for receiving two cartridges C simultaneously. Further, the third embodiment has tworods 80. Other features of the third embodiment are similar to those of the first embodiment described above and will not be described in further detail. A schematic cross section of the syringe assembly of the third embodiment is shown inFIG. 4a . As will be appreciated by those skilled in the art, thecartridge receiver 50 may be adapted to receive three cartridges C as shown in a schematic cross section of the syringe assembly of a fourth embodiment shown inFIG. 4b . This embodiment includes three access needles (not shown) extending through the cap of the receiver and three plunger rods (not shown) adapted to engage the respective seals of the cartridges C. Those skilled in the art will appreciate that still other embodiments adapted for receiving still more cartridges are also within the scope of the present invention. - In a fifth embodiment illustrated in
FIG. 5 , asyringe assembly 30″ includes a polished or convexannular ring 100 surrounding an exterior wall of thebarrel 32″. Thisconvex ring 100 magnifies the contents of thebarrel 32″. Thus, a user can more readily identify aspirate or flashback flowing backward through thedelivery needle 102 and into thesyringe assembly 30″. As other aspects of this embodiment are generally similar to those described above, they will not be described. -
FIG. 6 illustrates a sixth embodiment of asyringe assembly 30′″ of the present invention. In some instances patients become anxious upon seeing a needle of the syringe. To prevent the patient from seeing theneedle 102, anelastomeric sleeve 110 is fastened over the delivery needle of thesyringe assembly 30′″. When thesyringe assembly 30′″ is armed, theplunger rod 80′″ forces thedelivery needle 102 through theelastomeric sheath 110, exposing the needle for use. Other aspects of this embodiment are similar to those described above and will not be described. - Various portions of the syringe assembly may be made reusable to minimize waste. By selectively choosing the portions of the syringe assembly that are disposable, the need for sterilization may be minimized or eliminated. For example, in one embodiment illustrated in
FIG. 7 , a seventh embodiment of a syringe assembly, generally designated by 120, includes aquick release coupling 122 that holds theneedle 102 in place. When a user is finished using thesyringe assembly 120, thecoupling 122 is disconnected so theneedle 102 can be discarded. In some alternate embodiments having the needle and cartridge joined as a sub-assembly, releasing thecoupling 122 can operate to eject the entire sub-assembly. It is envisioned that an element could be included on a sharps container for disconnecting thecoupling 122. - In another embodiment of a syringe assembly, generally designated by 130 in
FIG. 8 , abarrel 132 separates so theneedle 102 and cartridge C can be discarded. Likewise, in another embodiment of a syringe assembly, generally designated by 140 inFIG. 9 , aplunger rod 142 separates to release the needle and cartridge C. In an embodiment of a syringe assembly, generally designated by 150 inFIG. 10 , a sub-assembly, generally designated by 152, comprising the needle and a cartridge (not shown) separates from thebarrel 154 so theneedle 102 and cartridge C can be discarded. The sub-assembly 152 may be fastened to thebarrel 154 in any conventional way, such as by a press fit connection as shown inFIG. 10 . Alternatively, the sub-assembly 152 may be fastened to thebarrel 154 by apin 156 that can be removed as shown inFIGS. 11a -d. In still another embodiment shown inFIG. 12 , thesub-assembly 152 is threadably connected to thebarrel 154 of thesyringe assembly 150. As will be appreciated by those skilled in the art, the disposable portion need not only include a distal portion of a barrel, but may also include a longer portion of thebarrel 160 as in a syringe assembly, generally designated by 162 inFIG. 13 . In another embodiment (not shown), a distal end of the barrel may include flexible leaves (similar to the leaves described below with respect toFIG. 18 ) so the sub-assembly can be ejected through the barrel by pushing the plunger rod. It is envisioned that a spring could be incorporated in the syringe assembly to aid ejection of the sub-assembly. - The syringe assembly designated by 162 in
FIG. 13 also includes other features of interest. In particular, thesyringe assembly 162 includes aneedle guard 164 extending from thebarrel 160 to a position beyond theneedle 102. It is envisioned that thisguard 164 can be folded so its distal end lies adjacent afinger flange 166 when the assembly is ready to use. When injection is complete, theguard 164 could be released permitting it to return to the unfolded configuration in which it could provide protection against inadvertent needle sticks. Further, theguard 164 may be made in a contrasting color so that flashback or aspirate is more apparent. The contrasting colors may include phosphorescent coloring. Alternatively, the barrel may be light transmitting or include back lighting or front lighting to further improve visibility of aspirate or flashback. -
FIGS. 14a-c illustrate an alternate embodiment of a syringe assembly, generally designated by 170, having aneedle guard 172. Before use, theguard 172 is pulled proximally onto thesyringe body 174. After use, the guard is pushed distally over theneedle 102 as shown inFIG. 14c . As will be appreciated by those skilled in the art, needle guards aid in preventing inadvertent needle stabs. - In some dental operations, anesthetic is desired over a broad area of tissue. Pulling a needle out of tissue and repositioning it to inject anesthetic in a different area can be painful for the patient. Thus, there is a need for a dental syringe that is capable of spreading anesthetic from a single injection site.
FIG. 15 illustrates an embodiment of adelivery needle 180 havingmultiple openings 182 along its length for spreading the anesthetic over a broader area of tissue.FIG. 16 illustrates yet another embodiment, in whichthin fibers 184 are extended from theneedle 186. Thefibers 184 fan out and cause multiple punctures in the patient's tissue that may be flooded with anesthetic so the tissue receives anesthetic over a broad area. It is envisioned that thefibers 184 may be made more flexible than the delivery needle but have sufficient rigidity to allow them to penetrate the tissue as they extend out of theneedle 186. In one embodiment, the fibers are solid rather than hollow, leaving puncture holes that can be flooded with anesthetic. It is believed that multiple injection sites could reduce discomfort by reducing forces applied to each site. - As previously mentioned, some patients become agitated or anxious at the sight of a conventional aspirating syringe. In order to provide less intimidating form factors for syringe assemblies, various modifications can be made to their configurations and appearance. For example, the syringe assembly may be colored to blend with the user's gloves, thereby camouflaging the syringe assembly. Alternately, the
delivery needle 102 may be configured to extend perpendicular to a primary axis A of the syringe assembly, generally designated by 190, as illustrated inFIG. 17 . This form factor may mimic other dental tools, such as water syringes, to reduce a likelihood recognition by the patient. -
FIG. 18 illustrates an automatically sizingthumb ring 200 that may be incorporated in any of the embodiments described above. Thethumb ring 200 includes anelastomeric panel 202 extending across itscentral opening 204. Thepanel 202 includes spaced radially extendingslots 206, formingleaves 208 in the panel that are separately deformed when the user's thumb is inserted in thering 200. As will be appreciated by those skilled in the art, theleaves 208 of thepanel 202 are biased toward the thumb, providing an appropriate fit. Alternatively, the thumb ring may be comprised of two halves ratcheted together. In one embodiment, ratchet teeth on one half operatively engage ratchet teeth on the other half of the thumb ring. The two halves may be compressed toward one another and locked via the ratchets to reduce the internal size of the thumb ring. Similarly, the two halves may be expanded and locked via ratchets to increase the internal size of the thumb ring. This automatically sizing thumb ring permits users having smaller and weaker hands to use the syringe. The ratchet locking mechanism of the thumb ring allows the user to both advance and retract the plunger rod without repositioning the hand. - An alternate embodiment of a syringe assembly, designated generally by 210 in
FIG. 19 , includes aplunger rod 212 having anelastomeric foam ball 214 in place of the conventional thumb ring.Elastomeric ball 214 may have any size and shape to conform to a user's hand, such as round or oval. It is believed such a configuration would provide a less intimidating form factor and provide a more universal fit for users. In an alternate embodiment, the elastomeric foam ball and plunger rod are replaced with an elastomeric hollow bulb that is squeezed to pressurize the anesthetic so that it is ejected from thedelivery needle 102. It is believed this alternate embodiment would provide a smooth and continuous flow of anesthetic to the patient because the bulb would dampen pressure changes, as well as provide a less intimidating form factor and a more universal fit for users. -
FIG. 20 shows an accumulator element, generally designated by 220, that could be incorporated in different locations of a syringe assembly. Theelement 220 is used along a hollow passage to minimize pressure changes. Ahole 222 is provided along the passage and an elastomeric balloon orbulb 224 is positioned around the area of the passage having the hole. The balloon orbulb 224 provides an elastomeric fluid accumulator. As anesthetic is delivered through the passage, the accumulator expands and contracts to absorb and release fluid as pressure varies in the passage. Thus, anesthetic may be delivered at a more constant pressure, thereby potentially reducing discomfort of the patient. It is envisioned that a damper could be formed along the plunger rod to accomplish a similar result. - Having described the invention in detail, it will be apparent that modifications and variations are possible without departing from the scope of the invention defined in the appended claims.
- When introducing elements of the present invention or the preferred embodiment(s) thereof, the articles “a”, “an”, “the”, and “said” are intended to mean that there are one or more of the elements. The terms “comprising”, “including”, and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements.
- As various changes could be made in the above constructions, products, and methods without departing from the scope of the invention, it is intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
Claims (23)
1-20. (canceled)
21. A syringe assembly comprising:
a barrel having an interior wall, an exterior wall, a proximal end, a distal end, the interior wall, exterior wall, proximal end, and distal end defining an interior volume of the barrel, and an annular magnification element surrounding the exterior wall of the barrel;
a delivery needle extending distally from the distal end of the barrel; and
a plunger rod movable within the interior volume defined by the barrel to eject a liquid through the delivery needle.
22. The syringe assembly of claim 21 , further comprising a cartridge receiver within the interior volume of the barrel, the cartridge receiver including an interior for receiving a cartridge having a diaphragm and a piston.
23. The syringe assembly of claim 22 , further comprising an access needle having a proximal delivery point to penetrate the diaphragm of the cartridge, and a distal delivery point extending into a barrel outlet adaptor for dispensing the liquid.
24. The syringe assembly of claim 22 , wherein the plunger rod extends into an interior of the cartridge receiver for engagement with the piston of the cartridge.
25. The syringe assembly of claim 22 , wherein the cartridge receiver includes an opening for loading the cartridge into the interior of the cartridge receiver and a cover for selectively covering the opening to retain the cartridge in the interior space.
26. The syringe assembly of claim 22 , further comprising an access adapter within the cartridge for engaging the delivery needle.
27. The syringe assembly of claim 21 , wherein the plunger rod includes a thumb ring for manipulating the syringe assembly.
28. The syringe assembly of claim 21 , wherein the barrel further comprises a finger flange extending outward from the exterior wall of the barrel.
29. The syringe assembly of claim 28 , wherein the finger flange extends radially outward from the proximal end of the barrel.
30. The syringe assembly of claim 21 , wherein the annular magnification element is polished for magnifying the contents of the barrel.
31. The syringe assembly of claim 21 , wherein the annular magnification element is convex for magnifying the contents of the barrel.
32. The syringe assembly of claim 23 , further comprising a quick release coupling to engage or disengage the delivery needle to the barrel.
33. The syringe assembly of claim 21 , wherein the annular magnification element surrounds the barrel adjacent to the delivery needle for monitoring flashback flowing backward through the delivery needle.
34. The syringe assembly of claim 31 , wherein the convex annular magnification element surrounds the barrel adjacent to the cartridge and the diaphragm for monitoring flashback flowing backward through the delivery needle.
35. The syringe assembly of claim 21 , wherein the barrel is formed of a transparent material.
36. The syringe assembly of claim 22 , wherein the cartridge is formed of a transparent material.
37. The syringe assembly of claim 22 , wherein the diaphragm is formed of a transparent material.
38. The syringe assembly of claim 21 , wherein the annular magnification element is molded integrally with the barrel.
39. The syringe assembly of claim 22 , wherein the cartridge receiver further comprises an exterior having a plurality of spaced ribs for engaging the interior wall of the barrel.
40. The syringe assembly of claim 22 , wherein the piston is positioned at a proximal end of the cartridge.
41. The syringe assembly of claim 22 , wherein the diaphragm is positioned at a distal end of the cartridge.
42. The syringe assembly of claim 22 , wherein the cartridge receiver further comprises a cap for sealably engaging the interior wall of the barrel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US15/075,277 US20160271328A1 (en) | 2011-04-05 | 2016-03-21 | Anesthetic Syringe |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US201161471903P | 2011-04-05 | 2011-04-05 | |
US13/438,853 US9289272B2 (en) | 2011-04-05 | 2012-04-04 | Anesthetic syringe |
US15/075,277 US20160271328A1 (en) | 2011-04-05 | 2016-03-21 | Anesthetic Syringe |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/438,853 Continuation US9289272B2 (en) | 2011-04-05 | 2012-04-04 | Anesthetic syringe |
Publications (1)
Publication Number | Publication Date |
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US20160271328A1 true US20160271328A1 (en) | 2016-09-22 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US13/438,853 Expired - Fee Related US9289272B2 (en) | 2011-04-05 | 2012-04-04 | Anesthetic syringe |
US15/075,277 Abandoned US20160271328A1 (en) | 2011-04-05 | 2016-03-21 | Anesthetic Syringe |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US13/438,853 Expired - Fee Related US9289272B2 (en) | 2011-04-05 | 2012-04-04 | Anesthetic syringe |
Country Status (5)
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US (2) | US9289272B2 (en) |
EP (1) | EP2508217B1 (en) |
JP (3) | JP5559831B2 (en) |
AU (1) | AU2012201968B2 (en) |
CA (1) | CA2773271C (en) |
Families Citing this family (7)
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US20150056718A1 (en) * | 2013-08-23 | 2015-02-26 | Sylvia Maria Cuttino | Dual syringe |
KR101462438B1 (en) * | 2013-11-07 | 2014-11-17 | 주식회사 메가젠임플란트 | Apparatus for injecting medicine |
BR112017023001B1 (en) * | 2015-06-12 | 2022-07-19 | Becton Dickinson France | ADAPTER FOR A DRUG DELIVERY DEVICE AND DRUG DELIVERY DEVICE |
KR101726196B1 (en) * | 2016-09-05 | 2017-04-26 | 박창순 | A syringe for reducing pain |
US11439742B2 (en) | 2017-02-08 | 2022-09-13 | Veran Medical Technologies, Inc. | Localization needle |
EP3666687B1 (en) | 2017-08-09 | 2024-01-17 | Shiseido Co., Ltd. | Discharge container, customized discharge system having discharge container, and discharge control method in discharge container |
CN109395228B (en) * | 2018-11-23 | 2020-12-15 | 王敏 | Portable field exploration wound local anesthesia ware |
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-
2012
- 2012-04-03 CA CA2773271A patent/CA2773271C/en not_active Expired - Fee Related
- 2012-04-03 EP EP12162966.1A patent/EP2508217B1/en active Active
- 2012-04-04 AU AU2012201968A patent/AU2012201968B2/en not_active Ceased
- 2012-04-04 US US13/438,853 patent/US9289272B2/en not_active Expired - Fee Related
- 2012-04-04 JP JP2012085741A patent/JP5559831B2/en not_active Expired - Fee Related
-
2014
- 2014-06-06 JP JP2014117405A patent/JP5990221B2/en not_active Expired - Fee Related
- 2014-08-28 JP JP2014173783A patent/JP2014217788A/en active Pending
-
2016
- 2016-03-21 US US15/075,277 patent/US20160271328A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
US9289272B2 (en) | 2016-03-22 |
CA2773271A1 (en) | 2012-10-05 |
JP2012217850A (en) | 2012-11-12 |
JP2014217788A (en) | 2014-11-20 |
CA2773271C (en) | 2016-10-11 |
JP5559831B2 (en) | 2014-07-23 |
JP2014193397A (en) | 2014-10-09 |
US20120258421A1 (en) | 2012-10-11 |
EP2508217A2 (en) | 2012-10-10 |
AU2012201968A1 (en) | 2012-10-25 |
EP2508217A3 (en) | 2014-10-01 |
JP5990221B2 (en) | 2016-09-07 |
EP2508217B1 (en) | 2019-09-04 |
AU2012201968B2 (en) | 2013-06-20 |
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Legal Events
Date | Code | Title | Description |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |