CA2224914A1 - Membrane cap for blood-collecting system - Google Patents
Membrane cap for blood-collecting system Download PDFInfo
- Publication number
- CA2224914A1 CA2224914A1 CA002224914A CA2224914A CA2224914A1 CA 2224914 A1 CA2224914 A1 CA 2224914A1 CA 002224914 A CA002224914 A CA 002224914A CA 2224914 A CA2224914 A CA 2224914A CA 2224914 A1 CA2224914 A1 CA 2224914A1
- Authority
- CA
- Canada
- Prior art keywords
- membrane
- extension
- needle
- cap
- blood
- 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
- 239000012528 membrane Substances 0.000 title claims abstract description 31
- 238000005192 partition Methods 0.000 claims abstract description 12
- 210000004379 membrane Anatomy 0.000 description 22
- 239000008280 blood Substances 0.000 description 13
- 210000004369 blood Anatomy 0.000 description 13
- 238000010241 blood sampling Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 240000007643 Phytolacca americana Species 0.000 description 1
- 235000009074 Phytolacca americana Nutrition 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/153—Devices specially adapted for taking samples of venous or arterial blood, e.g. with syringes
- A61B5/154—Devices using pre-evacuated means
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150015—Source of blood
- A61B5/15003—Source of blood for venous or arterial blood
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150351—Caps, stoppers or lids for sealing or closing a blood collection vessel or container, e.g. a test-tube or syringe barrel
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Surgery (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Hematology (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Investigating Or Analysing Biological Materials (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
A cap is used in combination with a needle holder having a collar and a double-ended needle and with a blood-collection tube having a neck. The cap is formed with a rear end shaped to fit complimentarily to the tube neck, a tubular front extension having a front edge and shaped to fit complimentarily to the holder collar with the needle projecting axially inward in the extension, and a crosswise centrally apertured partition spaced backward from the front edge. A pierceable membrane fixed on the crosswise partition is recessed in the body offset from the front end and traversed by the needle of the holder collar engaged with the front end. The membrane has a front face directed toward and spaced backward from the front edge of the extension.
Description
M13MBRAN}~ CAP FOR BLOOD--COLLECTING SYSTEM
SPECIFICATION
FIB ~ OF T~B INnneNTION
The present invention relates to a blood-collecting system. More particularly this invention concerns a cap for use between a blood-collecting vial and a needle holder.
BAC~GROUl~D OF THB IN~ENTION
As described in US patent 4,378,812 a standard blood-collecting kit comprises a sampling tube or vial having an open lo end, a cap fitted over this end and having a pierceable membrane, and a needle holder that is in turn fitted to the cap. The needle assembly comprises a luer collar fitted with a double-ended cannula or needle whose front end is inserted through the patient's skin normally into a vein from which blood is to be drawn. The cap has a luer fitting that fits complementary with the collar of the needle with the rear end of the needle poking through the membrane, and the opposite side of the cap is nor-mally threaded to fit on the collection tube. When fully assem-bled with the front needle end inserted into a blood vessel, a piston in the collection tube is retracted to draw blood through the cannula into the tube. Once the tube is full, it can be unscrewed and another tube similarly filled, if desired.
When the holder is separated from the cap some blood often drips from the rear needle end onto the membrane. Since this membrane is invariably mounted at the extreme outer end or mouth of a tubular extension of the cap, this creates a substan-tial risk of contamination and provides a possibility of a medical worker coming into direct contact with the warm fresh blood thus dripped onto the exposed face of the membrane. In this day and age it is obvious that such a potentially dangerous situation must be avoided.
In order to eliminate this problem it has been sug-gested to provide the cap with a pierceable membrane or plug which is mounted at the outer end of the cap but that has an outwardly concavely recessed floor so that any drip does not simply lie on a flat end surface, but is slightly recessed. This type of plug reduces the already small diameter of the cap extension or the wall thickness of the extension is increased by the wall of the plug. This recess creates a reduction in the diameter of the cavity into which the needle is poked, which creates extra friction with the pierceable sterile sheath that normally surrounds the rear end of the needle and that is pushed back like a harmonica as the needle pierces it and the membrane of the cap. Furthermore when the needle assembly is pulled off the cap, any blood on the needle tip is transferred to the end of the bunched up sheath and spread on the end of the cap.
In the Vacuette system of Greiner Labortechnik a cup-shaped plug is again used, but mounted directly on the sampling tube, making it inconvenient to switch tubes. This system is not actually a cap since the cannula itself is provided with a guide sleeve that fits on the front end of the collection tube itself, eliminating the need for a cap altogether. The plug is of much larger diameter since it covers the whole end of the blood tube, so that contact with any blood dripped onto its outer surface is a distinct possibility.
US patent 5,086,783 of Macors describes a blood-sam-pling kit specifically intended for doing blood-gas work on arterial blood. Its plug is mounted immediately at the end of the luer recess that receives the tip of the collecting tube, but the system here is constructed such that the membrane itself is moved in a piston down onto the needle by the collection tube, and once the sample is taken the piston remains fixed on the end of the collection tube. This system does not, therefore, have the problem of leaving exposed the back face of the plug.
OBJ~CT~ OF T~B INVBNTION
It is therefore an object of the present invention to provide an improved cap for a blood-collecting kit.
Another object is the provision of such an improved cap for a blood-collecting kit which overcomes the above-given disadvantages, that is which is of simple construction but that effectively prevents contact with any blood dripped on the back or outer face of the cap's membrane/plug.
~UMMARY OF THE INVENTION
The instant invention is a cap used in combination with a needle holder having a collar and a double-ended needle and with a blood-collection tube having a neck. The cap according to the invention is formed with a rear end shaped to fit complemen-tarily to the tube neck, a tubular front extension having a front edge and shaped to fit complementarily to the holder collar with the needle projecting axially inward in the extension, and a crosswise centrally apertured partition spaced backward from the front edge. A pierceable membrane fixed on the crosswise parti-tion is recessed in the body offset from the front end and traversed by the needle of the holder collar engaged with the front end. The membrane has a front face directed toward and spaced backward from the front edge of the extension.
With this system therefore, where the ratio of the width or diameter of the compartment is equal to at most twice and is preferably the same as the height of the compartment, any dripped blood will be adequately contained. In addition it will be contained at the bottom of a compartment where the user's finger could not normally come into contact with it.
According to the invention the extension is frusto-conically tapered forward of the membrane. Alternately to allow for the largest possible membrane the extension is frusto-conically tapered forward at the membrane and is cylindricalforward and backward of the membrane. In either case the mem-brane, which is of uniform thickness, is an elastomeric plug bonded to the partition, normally by being pushed against the partition by a die and welded to the partition.
BRIEF DB8CRIPTION OF THB DRA~ING
The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:
FIG. 1 is a side view of the system of this invention;
FIG. 2 is another side view partly in axial section of the system;
FIG. 3 is a view like FIG. 1 of another cap according to the invention; and .
FIG. 4 is a side view partly in axial section through the cap of FIG. 3.
8PFCIFIC ~ rTPTION
As seen in FIGS. 1 and 2 a cap 1 according to this invention is normally mounted on the threaded neck of a blood-sampling or -collection tube 12 and is formed centered on an axis A with a cylindrically tubular clear-plastic extension 2 having a front end edge 4. Internally the extension 2 is formed with a transverse partition 6 having a central hole 16. A pierceable plug or membrane 5 of elastomeric material is welded atop the partition 6, which is positioned well below the upper end 4. The outer end of the extension 2 is tapered frustoconically at 7 above the membrane 5 so as to form above this membrane 8 a compartment 8.
The compartment 8 here has an average diameter D and an overall axial height H. The ratio D:H is approximately 1:1 and under no circumstances should the diameter D be more than twice the height H. In this manner even a small finger could not normally fit into the compartment 8.
In use a needle holder 13 basically comprised of a tubular collar 14 adapted to fit around the extension 2 and a double-ended needle 15 is fitted over the extension 2 so that the rear end of the needle 15, which normally is covered by a frangi-ble sheath 18, pokes through the membrane 5 and passes through the hole 16. The sheath 18 is punctured and pushed up, but does not contact the inside wall of the compartment 8. Thus if blood from the needle 15 drips onto the membrane 5 when the holder 13 is removed from the cap 1, this blood will be contained within the compartment 8 where it cannot in a normal course of events be touched by the person using the system. Since diameter D is sufficient that the sheath 18 does not contact the inside wall of the compartment, any blood drip on the needle 15 will not nor-mally be wiped off on the extension end 7 as the needle holder 13 is pulled off the cap l.
FIGS. 3 and 4 show a slightly different system where the cap 10 has a tubular extension 11 that tapers frustoconically inward at ll level with the membrane 5, and then extends cylin-drically at 17. Otherwise this embodiment is identical to that of FIGS. l and 2.
SPECIFICATION
FIB ~ OF T~B INnneNTION
The present invention relates to a blood-collecting system. More particularly this invention concerns a cap for use between a blood-collecting vial and a needle holder.
BAC~GROUl~D OF THB IN~ENTION
As described in US patent 4,378,812 a standard blood-collecting kit comprises a sampling tube or vial having an open lo end, a cap fitted over this end and having a pierceable membrane, and a needle holder that is in turn fitted to the cap. The needle assembly comprises a luer collar fitted with a double-ended cannula or needle whose front end is inserted through the patient's skin normally into a vein from which blood is to be drawn. The cap has a luer fitting that fits complementary with the collar of the needle with the rear end of the needle poking through the membrane, and the opposite side of the cap is nor-mally threaded to fit on the collection tube. When fully assem-bled with the front needle end inserted into a blood vessel, a piston in the collection tube is retracted to draw blood through the cannula into the tube. Once the tube is full, it can be unscrewed and another tube similarly filled, if desired.
When the holder is separated from the cap some blood often drips from the rear needle end onto the membrane. Since this membrane is invariably mounted at the extreme outer end or mouth of a tubular extension of the cap, this creates a substan-tial risk of contamination and provides a possibility of a medical worker coming into direct contact with the warm fresh blood thus dripped onto the exposed face of the membrane. In this day and age it is obvious that such a potentially dangerous situation must be avoided.
In order to eliminate this problem it has been sug-gested to provide the cap with a pierceable membrane or plug which is mounted at the outer end of the cap but that has an outwardly concavely recessed floor so that any drip does not simply lie on a flat end surface, but is slightly recessed. This type of plug reduces the already small diameter of the cap extension or the wall thickness of the extension is increased by the wall of the plug. This recess creates a reduction in the diameter of the cavity into which the needle is poked, which creates extra friction with the pierceable sterile sheath that normally surrounds the rear end of the needle and that is pushed back like a harmonica as the needle pierces it and the membrane of the cap. Furthermore when the needle assembly is pulled off the cap, any blood on the needle tip is transferred to the end of the bunched up sheath and spread on the end of the cap.
In the Vacuette system of Greiner Labortechnik a cup-shaped plug is again used, but mounted directly on the sampling tube, making it inconvenient to switch tubes. This system is not actually a cap since the cannula itself is provided with a guide sleeve that fits on the front end of the collection tube itself, eliminating the need for a cap altogether. The plug is of much larger diameter since it covers the whole end of the blood tube, so that contact with any blood dripped onto its outer surface is a distinct possibility.
US patent 5,086,783 of Macors describes a blood-sam-pling kit specifically intended for doing blood-gas work on arterial blood. Its plug is mounted immediately at the end of the luer recess that receives the tip of the collecting tube, but the system here is constructed such that the membrane itself is moved in a piston down onto the needle by the collection tube, and once the sample is taken the piston remains fixed on the end of the collection tube. This system does not, therefore, have the problem of leaving exposed the back face of the plug.
OBJ~CT~ OF T~B INVBNTION
It is therefore an object of the present invention to provide an improved cap for a blood-collecting kit.
Another object is the provision of such an improved cap for a blood-collecting kit which overcomes the above-given disadvantages, that is which is of simple construction but that effectively prevents contact with any blood dripped on the back or outer face of the cap's membrane/plug.
~UMMARY OF THE INVENTION
The instant invention is a cap used in combination with a needle holder having a collar and a double-ended needle and with a blood-collection tube having a neck. The cap according to the invention is formed with a rear end shaped to fit complemen-tarily to the tube neck, a tubular front extension having a front edge and shaped to fit complementarily to the holder collar with the needle projecting axially inward in the extension, and a crosswise centrally apertured partition spaced backward from the front edge. A pierceable membrane fixed on the crosswise parti-tion is recessed in the body offset from the front end and traversed by the needle of the holder collar engaged with the front end. The membrane has a front face directed toward and spaced backward from the front edge of the extension.
With this system therefore, where the ratio of the width or diameter of the compartment is equal to at most twice and is preferably the same as the height of the compartment, any dripped blood will be adequately contained. In addition it will be contained at the bottom of a compartment where the user's finger could not normally come into contact with it.
According to the invention the extension is frusto-conically tapered forward of the membrane. Alternately to allow for the largest possible membrane the extension is frusto-conically tapered forward at the membrane and is cylindricalforward and backward of the membrane. In either case the mem-brane, which is of uniform thickness, is an elastomeric plug bonded to the partition, normally by being pushed against the partition by a die and welded to the partition.
BRIEF DB8CRIPTION OF THB DRA~ING
The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:
FIG. 1 is a side view of the system of this invention;
FIG. 2 is another side view partly in axial section of the system;
FIG. 3 is a view like FIG. 1 of another cap according to the invention; and .
FIG. 4 is a side view partly in axial section through the cap of FIG. 3.
8PFCIFIC ~ rTPTION
As seen in FIGS. 1 and 2 a cap 1 according to this invention is normally mounted on the threaded neck of a blood-sampling or -collection tube 12 and is formed centered on an axis A with a cylindrically tubular clear-plastic extension 2 having a front end edge 4. Internally the extension 2 is formed with a transverse partition 6 having a central hole 16. A pierceable plug or membrane 5 of elastomeric material is welded atop the partition 6, which is positioned well below the upper end 4. The outer end of the extension 2 is tapered frustoconically at 7 above the membrane 5 so as to form above this membrane 8 a compartment 8.
The compartment 8 here has an average diameter D and an overall axial height H. The ratio D:H is approximately 1:1 and under no circumstances should the diameter D be more than twice the height H. In this manner even a small finger could not normally fit into the compartment 8.
In use a needle holder 13 basically comprised of a tubular collar 14 adapted to fit around the extension 2 and a double-ended needle 15 is fitted over the extension 2 so that the rear end of the needle 15, which normally is covered by a frangi-ble sheath 18, pokes through the membrane 5 and passes through the hole 16. The sheath 18 is punctured and pushed up, but does not contact the inside wall of the compartment 8. Thus if blood from the needle 15 drips onto the membrane 5 when the holder 13 is removed from the cap 1, this blood will be contained within the compartment 8 where it cannot in a normal course of events be touched by the person using the system. Since diameter D is sufficient that the sheath 18 does not contact the inside wall of the compartment, any blood drip on the needle 15 will not nor-mally be wiped off on the extension end 7 as the needle holder 13 is pulled off the cap l.
FIGS. 3 and 4 show a slightly different system where the cap 10 has a tubular extension 11 that tapers frustoconically inward at ll level with the membrane 5, and then extends cylin-drically at 17. Otherwise this embodiment is identical to that of FIGS. l and 2.
Claims (6)
1. In combination with a needle holder having a collar and a double-ended needle and with a blood-collection tube having a neck, a cap comprising:
a cap body formed with a rear end shaped to fit complementarily to the tube neck, a tubular front extension having a front edge and shaped to fit complementarily to the holder collar with the needle projecting axially inward in the extension, and a crosswise centrally apertured partition spaced backward from the front edge; and a pierceable membrane fixed on the crosswise partition, recessed in the body offset from the front end, and traversed by the needle of the holder collar engaged with the front end, the membrane having a front face directed toward and spaced backward from the front edge of the extension.
a cap body formed with a rear end shaped to fit complementarily to the tube neck, a tubular front extension having a front edge and shaped to fit complementarily to the holder collar with the needle projecting axially inward in the extension, and a crosswise centrally apertured partition spaced backward from the front edge; and a pierceable membrane fixed on the crosswise partition, recessed in the body offset from the front end, and traversed by the needle of the holder collar engaged with the front end, the membrane having a front face directed toward and spaced backward from the front edge of the extension.
2. The combination defined in claim 1 wherein the extension is frustoconically tapered forward of the membrane.
3. The combination defined in claim 1 wherein the extension is frustoconically tapered forward at the membrane and is cylindrical forward and backward of the membrane.
4. The combination defined in claim 1 wherein the membrane is an elastomeric plug bonded to the partition.
5. The combination defined in claim 1 wherein the compartment has an axial dimension and a transverse horizontal dimension and the transverse dimension is equal to at most twice the horizontal dimension.
6. The combination defined in claim 2 wherein the dimensions are approximately equal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19703178.1 | 1997-01-29 | ||
| DE19703178A DE19703178A1 (en) | 1997-01-29 | 1997-01-29 | Blood collection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2224914A1 true CA2224914A1 (en) | 1998-07-29 |
Family
ID=7818667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002224914A Abandoned CA2224914A1 (en) | 1997-01-29 | 1998-01-23 | Membrane cap for blood-collecting system |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0856281A3 (en) |
| JP (1) | JPH10216111A (en) |
| AU (1) | AU5281998A (en) |
| CA (1) | CA2224914A1 (en) |
| DE (1) | DE19703178A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19739369C2 (en) * | 1997-09-09 | 2000-04-06 | Sarstedt Ag & Co | Blood collection device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3603312A (en) * | 1969-06-30 | 1971-09-07 | Parke Davis & Co | Disposable dispensing syringe vial |
| DE2948653C2 (en) | 1979-12-04 | 1984-01-05 | Walter Sarstedt Kunststoff-Spritzgußwerk, 5223 Nümbrecht | Blood collection device |
| DE8504693U1 (en) * | 1985-02-20 | 1986-01-02 | KABE Labortechnik GmbH, 5223 Nümbrecht | Blood collection device |
| US4967919A (en) * | 1988-11-23 | 1990-11-06 | Sherwood Medical Company | Blood collection tube safety cap |
| US5086783A (en) * | 1990-10-31 | 1992-02-11 | Sherwood Medical Company | Blood sampling device |
-
1997
- 1997-01-29 DE DE19703178A patent/DE19703178A1/en not_active Withdrawn
-
1998
- 1998-01-23 CA CA002224914A patent/CA2224914A1/en not_active Abandoned
- 1998-01-24 EP EP98101225A patent/EP0856281A3/en not_active Withdrawn
- 1998-01-27 JP JP10013695A patent/JPH10216111A/en not_active Withdrawn
- 1998-01-29 AU AU52819/98A patent/AU5281998A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP0856281A3 (en) | 1999-04-07 |
| AU5281998A (en) | 1998-08-06 |
| DE19703178A1 (en) | 1998-08-06 |
| JPH10216111A (en) | 1998-08-18 |
| EP0856281A2 (en) | 1998-08-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |