AU733018B2 - Infusion device - Google Patents
Infusion device Download PDFInfo
- Publication number
- AU733018B2 AU733018B2 AU69060/98A AU6906098A AU733018B2 AU 733018 B2 AU733018 B2 AU 733018B2 AU 69060/98 A AU69060/98 A AU 69060/98A AU 6906098 A AU6906098 A AU 6906098A AU 733018 B2 AU733018 B2 AU 733018B2
- Authority
- AU
- Australia
- Prior art keywords
- chamber
- outlet
- float member
- inlet
- liquid
- 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.)
- Ceased
Links
Classifications
-
- 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
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/1411—Drip chambers
-
- 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
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/14212—Pumping with an aspiration and an expulsion action
- A61M5/1424—Manually operated pumps
Description
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATION NAME OF APPLICANT(S): Smiths Industries Public Limited Company ADDRESS FOR SERVICE: DAVIES COLLISON CAVE Patent Attorneys 1 Little Collins Street, Melbourne, 3000.
INVENTION TITLE: Infusion device The following statement is a full description of this invention, including the best method of performing it known to me/us:- 6
CCC*
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*6 C C b C t
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a.
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This invention relates to infusion devices.
Fluid, such as saline, blood or the like, can be infused into a patient from a reservoir suspended above the patient, via a drip chamber by which the flow of fluid can be seen. The drip chamber often includes a float valve floating on fluid in the chamber, which blocks flow into the chamber when the level of fluid in the chamber is too high. Examples of such drip o*o.
"chambers are described in, for example, W096/35465, EP228802, EP674910, GB2147087, GB2266842, GB2028975 and US4055176. In many cases, the float valve in such drip chambers is also arranged to block the outlet from the chamber when the level of fluid in the S. chamber falls below a certain level. This can be a problem in some cases because the flow of fluid out of the chamber can cause the float valve to be pulled down and shut off flow through the valve, even when there is still some fluid remaining in the chamber.
o• :It is an object of the present invention to provide an improved infusion device.
According to the present invention there is provided an infusion device including a chamber having an inlet at its upper end and an outlet at its lower end, and a float member arranged to float in liquid in the chamber and to move up or down the chamber as the level of liquid rises or falls, the float member being arranged to impede flow of liquid into the chamber from the inlet at high liquid levels, the chamber being configured in the region of the P:\OPERAr\6O)6)-98 O30.do-30/l1/01 -2outlet to maintain a fluid flow passage between the outlet and the float member when the float member is at its lowest point in the chamber by means of a plurality of projections in the region of the outlet arranged to support the float member spaced above the outlet, and wherein the area between the projections when contacted by the float member is preferably about one and a half times the area of the outlet.
The projections are preferably four pegs spaced from one another around the outlet.
The inlet may have a projecting spigot arranged for engagement by the float member at high liquid levels. The chamber preferably has a bendable wall whereby the chamber can be squeezed to expel liquid from the outlet. The device may include an upper filter chamber mounted at the inlet of the lower chamber containing the float member, the filter chamber oo.: being arranged to filter liquid supplied to the inlet. The device may include two cylindrical walls forming walls of the upper and lower chambers respectively, and a connection piece joining the two walls together and providing the inlet of the lower chamber. The float ooooo member is preferably a spherical ball.
go An infusion device including a drip chamber according to the present invention, will i now be described, by way of example, with reference to the accompanying drawings, in which: Figure -1 is a sectional side elevation view of the infusion device; 3 Figure 2 is an enlarged sectional side elevation view of the base of the device; Figure 3 is a plan view of the base of the device; and Figure 4 is a perspective view of the base of the device.
With reference first to Figure 1, there is shown an infusion device 1 with an inlet 2 at its upper end for connection to a blood bag via inlet tubing (not shown). At its lower end, the oo device 1 has an outlet 3 for connection to a patient via outlet tubing (not shown). The infusion device 1 is of tubular shape having a filter chamber 4 at its upper end communicating with a drip chamber 5 at its lower end. The outer wall of the device 1 is provided by two cylindrical sleeves 6 and 7 of a transparent, bendable plastics joined end-to-end by a central connection piece 8.
oo* so The upper sleeve 6 forms the wall of the filter chamber 4 and is sealed at its upper end to a cap 9 having an axial, upwardly-projecting spigot 10 forming the inlet 2 of the device.
The filter chamber 4 may be of conventional form and contains a tubular filter element sealed with the inside of the cap 9 so that any solid matter or clots are removed from blood flowing through the filter element.
The central connection piece 8 is moulded from a substantially rigid plastics material and has an upwardly-projecting collar 80 and a downwardly-projecting collar 81 separated by 4 an internal transverse plate 82, which also projects outwardly of the sleeves to form a flange 83. The lower end of the upper sleeve 6 is a push fit on the collar 80, abutting the flange 83 and is retained in place by a solvent, adhesive or by welding. Similarly, the upper end of the lower sleeve 7 is fitted on the downwardly-projecting collar 81. The plate 82 has a spigot 84 in its centre projecting downwardly into the drip chamber 5, providing a drip inlet into the chamber.
The outlet 3 of the drip chamber 5 is provided by a base member 30 shown in more detail in Figures 2 to 4. The base member 30 has a co-axial inner and outer collar 31 and 32 forming an annular recess 33 therebetween, in which the lower end of the sleeve 7 is retained.
The internal diameter of the base member 30 within the inner collar 31 is about 16mm. The base member 30 has an spigot 34 projecting downwardly externally of the chamber, which provides the outlet over which outlet tubing is fitted. The spigot 34 opens at its upper end through a central opening 35 about 3mm in diameter. The inside of the base member 30 has a floor 36 tapering down towards the central opening 35, forming a frusto-conical surface. Four pegs 37 project vertically upwardly from the floor 36 of the base member, each being about 3.4mm high and of circular section with a diameter of about 1.75mm. The pegs 37 are equally spaced from one another around the central opening 35 and are located with their centres on a coaxial circle of diameter d, about 8.6mm, so that the inside edge of the pegs lies on a circle of diameter d 2 of about 6.85mm. The top of each peg 37 has a rounded edge.
The drip chamber 5 also contains a float member in the form of a spherical ball 40 of diameter about 10.5 mm and of a material that will float on the surface of blood in the drip chamber. The diameter of the ball 40 is selected so that it locates squarely on the bottom of the spigot 84 when the level of blood in the drip chamber 5 is high. The locations and height of the pegs 37 is selected so that the ball 40 sits squarely on the tops of the four pegs with the bottom of the ball being spaced above the opening 35 when the level of blood in the drip chamber 5 is low. The height of the pegs 37 is selected so that, when the ball is sitting on top of the pegs, the area for flow between the pegs is equal to about one and a half times the area of the outlet opening 35. Because this area is greater than that of the outlet opening, flow is not significantly impeded by the inclusion of the pegs. It has been found preferable to use .o four pegs 37, rather than three, because they reduce the risk of the ball being trapped between the pegs and the lower end of the sleeve. The pegs 37 are spaced away from the opening 35 to S ensure that any clots that might form on the pegs do not block the opening.
In operation, blood from the blood bag flows through the inlet tubing into the inlet 2 of the filter chamber 4, to fill the bottom of the chamber. Blood then drips through the drip inlet 84 into the drip chamber 5 so that the level of blood in the chamber is somewhere S0 between its upper and lower limits. The ball 40 floats on the surface of the blood without providing any significant obstacle to flow.
If the level of blood should rise to that indicated by the line in Figure 1, the upper surface of the ball 40 will engage the lower end of the drip inlet 84 and prevent any further significant flow into the drip chamber 5 until the level falls again. In some circumstances it is necessary to pump the drip chamber 5 manually to increase flow or to prime the outlet tubing.
This is done by squeezing the sleeve 7 of the drip chamber 5 to compress the chamber and force blood through the outlet 3. When this is done, the ball float 40 seals with the drip inlet 84 to prevent blood flowing in the opposite direction.
If the level of blood should fall to that indicated by the lower line the ball 40 will seat on the pegs 37. As mentioned above, in this position, the ball 40 is spaced above the opening 35 so that any residual blood can flow around the pegs 37, under the ball and out of the outlet. This arrangement ensures that the float can never occlude the outlet, such as might otherwise be caused at high flow rates and low levels of blood in the drip chamber. The pegs 37 have also been found to create a spiralling vortex flow of blood through the outlet which enables increased flow rates to be achieved.
Instead of pegs, there are various other ways in which the chamber could be 000*o configured in the region of the outlet to maintain a fluid flow passage between the outlet and ooo 0.
o: the float member when the float member is at its lowest point in the chamber. For example, o.
o0.: 0 the floor of the chamber could be formed with ridges or grooves to provide a flow passage under the float. The float member need not be spherical but could be of other shapes.
*oo The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that the prior art forms part of the common general knowledge in Australia.
Claims (7)
1. An infusion device including a chamber having an inlet at its upper end and an outlet at its lower end, and a float member arranged to float in liquid in the chamber and to move up or down the chamber as the level of liquid rises or falls, the float member being arranged to impede flow of liquid into the chamber from the inlet at high liquid levels, wherein the chamber is configured in the region of the outlet to maintain a fluid flow passage between the outlet and the float member when the float member is at its lowest point in the chamber by means of a plurality of projections in the region of the outlet arranged to support the float member spaced above the outlet, and wherein the area between the projections when contacted by the float member is about one and a half times the area of the outlet.
2. A device according to Claim 1, wherein the projections are four pegs spaced from one another around the outlet.
3. A device according to Claim 1 or 2, wherein the inlet has a projecting spigot arranged :0 for engagement by the float member at high liquid levels. *ooo *o
4. A device according to any one of the preceding claims, wherein the chamber has a bendable wall whereby the chamber can be squeezed to expel liquid from the outlet. 8 A device according to any one of the preceding claims including an upper filter chamber mounted at the inlet of the lower chamber containing the float member, and wherein the filter chamber is arranged to filter liquid supplied to said inlet.
6. A device according to Claim 5, including two cylindrical walls forming walls of the upper and lower chamber respectively, and a connection piece joining said two walls together and providing the said inlet of said lower chamber.
7. A device according to any one of the preceding claims, wherein said float member is a spherical ball.
8. An infusion device substantially as hereinbefore described with reference to the accompanying drawings. DATED this 3 0 th day of January, 2001. Smiths Industries Public Limited Company by DAVIES COLLISON CAVE S.Patent Attorneys for the Applicant(s)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9711166 | 1997-05-31 | ||
GBGB9711166.0A GB9711166D0 (en) | 1997-05-31 | 1997-05-31 | Infusion device |
Publications (2)
Publication Number | Publication Date |
---|---|
AU6906098A AU6906098A (en) | 1998-12-03 |
AU733018B2 true AU733018B2 (en) | 2001-05-03 |
Family
ID=10813289
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU69060/98A Ceased AU733018B2 (en) | 1997-05-31 | 1998-05-29 | Infusion device |
Country Status (4)
Country | Link |
---|---|
AU (1) | AU733018B2 (en) |
GB (2) | GB9711166D0 (en) |
IE (1) | IE980390A1 (en) |
NZ (1) | NZ330450A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103357083A (en) * | 2012-04-10 | 2013-10-23 | 上海金塔医用器材有限公司 | Disposable liquor-stopping and flow-slowing infusion device |
CN102626532A (en) * | 2012-04-10 | 2012-08-08 | 上海金塔医用器材有限公司 | Slow flow device for disposable transfusion set |
CN103800972A (en) * | 2012-11-09 | 2014-05-21 | 郑州昊能科技有限公司 | Disposable vein infusion apparatus automatic cut-off drip chamber |
EP4069331A1 (en) * | 2019-12-05 | 2022-10-12 | Amgen Inc. | Flow restrictor for drug delivery device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2028975A (en) * | 1978-08-30 | 1980-03-12 | Baxter Travenol Lab | Parenteral infusion drip chamber |
GB2045902A (en) * | 1979-04-16 | 1980-11-05 | Abbott Lab | One-way for parenteral apparatus |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4055176A (en) * | 1976-05-24 | 1977-10-25 | Valleylab | Universal drip chamber and spike assembly |
-
1997
- 1997-05-31 GB GBGB9711166.0A patent/GB9711166D0/en active Pending
-
1998
- 1998-05-18 NZ NZ33045098A patent/NZ330450A/en unknown
- 1998-05-20 GB GB9810848A patent/GB2325726B/en not_active Expired - Fee Related
- 1998-05-21 IE IE980390A patent/IE980390A1/en not_active IP Right Cessation
- 1998-05-29 AU AU69060/98A patent/AU733018B2/en not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2028975A (en) * | 1978-08-30 | 1980-03-12 | Baxter Travenol Lab | Parenteral infusion drip chamber |
GB2045902A (en) * | 1979-04-16 | 1980-11-05 | Abbott Lab | One-way for parenteral apparatus |
Also Published As
Publication number | Publication date |
---|---|
GB2325726A (en) | 1998-12-02 |
GB9810848D0 (en) | 1998-07-22 |
AU6906098A (en) | 1998-12-03 |
GB2325726B (en) | 2001-04-11 |
NZ330450A (en) | 1999-04-29 |
IE980390A1 (en) | 1998-12-02 |
GB9711166D0 (en) | 1997-07-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TC | Change of applicant's name (sec. 104) |
Owner name: SMITHS GROUP PLC Free format text: FORMER NAME: SMITHS INDUSTRIES PUBLIC LIMITED COMPANY |
|
FGA | Letters patent sealed or granted (standard patent) | ||
MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |