GB2048077A - Hypodermic Syringe - Google Patents
Hypodermic Syringe Download PDFInfo
- Publication number
- GB2048077A GB2048077A GB8012258A GB8012258A GB2048077A GB 2048077 A GB2048077 A GB 2048077A GB 8012258 A GB8012258 A GB 8012258A GB 8012258 A GB8012258 A GB 8012258A GB 2048077 A GB2048077 A GB 2048077A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cylinder
- piston rod
- cap
- hypodermic syringe
- piston
- 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.)
- Withdrawn
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
- A61M5/178—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
Landscapes
- Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
In a hypodermic syringe (1) comprising a tube (2) having an apertured front wall (3) and a cap (9), a piston (6) is carried by a piston rod (7) which passes through the cap (9) and is smaller than the tube (2) so as not to touch the inside of the tube. The cap (9) has an aperture which corresponds in shape to the cross- section of the rod (7) (e.g. cruciform). <IMAGE>
Description
SPECIFICATION
Hypodermic Syringe
The invention relates to a hypodermic syringe comprising a cylinder on the centrally apertured front wall of which the needle is placed, and a piston which is guided for axial displacement in the cylinder and of which the free end of the piston rod projecting beyond the rear end of the cylinder carries a pressure plate.
In known hypodermic syringes of this kind, the piston rod is of cruciform cross-section and guided in the cylinder by the webs of this crosssection being supported on the inside of the cylinder wall. It is practically impossible for the person preparing an injection to avoid touching the webs of the piston rod when the latter is retracted. Consequently, the webs may contaminate the inside of the cylinder wall when they touch the wall during an injection or when the piston rod is depressed.
The invention therefore aims to provide a hypodermic syringe in which a danger of contaminating the syringe cylinder by the piston rod is avoided.
According to the invention, this aim is achieved in a hypodermic syringe of the aforementioned kind in that the largest diameter of the piston rod is smaller than the inner diameter of the cylinder and the piston rod passes through a cap which is placed on the rear end of the cylinder and is provided with an aperture corresponding in shape to the cross-section of the piston rod. In the hypodermic syringe according to the invention, the piston rod is guided on the one hand by the piston of the syringe and on the other hand by the cap that is placed on the cylinder or by a closure member at the end, so that the piston rod cannot touch the inside of the cylinder wall even if it has a cruciform cross-section for the purpose of rigidity.Since the piston rod can no longer come into contact with the inside of the cylinder wall, no harm is done if the person preparing an injection happens to touch the piston rod when retracting same.
As in the case of known hypodermic syringes, the syringe according to the invention may be made from extruded plastics components. The cap for guiding the piston rod is placed on the rear end of the cylinder and connected thereto in known manner, for example by adhesion. The cap is desirably provided with lateral fins which, whilst the syringe is being prepared, can be applied to the index and middle fingers and serve as counterbearings for the pressure exerted on the piston rod.
One example of the invention will now be described in more detail with reference to the drawing, wherein:~
Fig. 1 is a side elevation of the hypodermic syringe;
Fig. 2 is a section through the syringe taken on the line Il-Il in Fig. 1, and
Fig. 3 is a plan view of the cap closing the end of the syringe cylinder.
The hypodermic syringe 1 consists of a plastics cylinder 2 closed by a front wall which is provided with a through passage. The throughpassage is connected to the needle 5 by a coupling member 4.
A piston 6 provided with a rubber sealing ring is axially displaceable in the cylinder 1. The piston 6 is secured to the front end of a piston rod 7 which is cruciform in cross-section. The piston rod 7 passes through the cruciform slot 8 which serves to guide same and is centrally disposed in the cap 9 by which the cylinder 2 is closed at the end. The cap 9 is provided with an annular rim 10 secured to the outside of the cylinder 2. The cap 9 is also provided with lateral fins 1 1 which serve as counterbearings for the pressure exerted on the piston rod 7 during an injection. The end of the piston rod 7 carries a pressure plate 12 which can be connected to the piston rod 7 as soon as the latter has been passed through the cruciform slot 8 in the cap 9.
Claims (3)
1. A hypodermic syringe comprising a cylinder on the centrally apertured front wall of which the needle is placed, and a piston which is guided for axial displacement in the cylinder and of which the free end of the piston rod projecting beyond the rear end of the cylinder carries a pressure plate, in which the largest diameter of the piston rod (7) is smaller than the inner diameter of the cylinder (2) and that the piston rod (7) passes through a cap (9) which is placed on the rear end of the cylinder (2) and is provided with an aperture (8) corresponding in shape to the crosssection of the piston rod (7).
2. A hypodermic syringe according to claim 1, in which the cap (9) is made in one piece with lateral fins (11).
3. A hypodermic syringe substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19797912969 DE7912969U1 (en) | 1979-05-04 | 1979-05-04 | INJECTION SYRINGE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2048077A true GB2048077A (en) | 1980-12-10 |
Family
ID=6703720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8012258A Withdrawn GB2048077A (en) | 1979-05-04 | 1980-04-14 | Hypodermic Syringe |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE7912969U1 (en) |
| FR (1) | FR2455464A1 (en) |
| GB (1) | GB2048077A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0549708A1 (en) * | 1990-09-18 | 1993-07-07 | Ballard Med Prod | Medical lavage apparatus. |
| GB2266667A (en) * | 1992-05-06 | 1993-11-10 | Product Research Ltd | Disposable hypodermic syringe |
| US5980487A (en) * | 1994-05-04 | 1999-11-09 | Product Research Limited | Hypodermic syringe |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3107414C2 (en) * | 1981-02-27 | 1983-03-24 | B. Braun Melsungen Ag, 3508 Melsungen | Disposable syringe for medical use |
| DE19923131A1 (en) * | 1999-05-19 | 2000-11-30 | Sigismund Laskowski | Medical injection syringe articulates piston rod to leading section guiding piston coaxially in cylinder |
-
1979
- 1979-05-04 DE DE19797912969 patent/DE7912969U1/en not_active Expired
-
1980
- 1980-04-14 GB GB8012258A patent/GB2048077A/en not_active Withdrawn
- 1980-04-30 FR FR8009901A patent/FR2455464A1/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0549708A1 (en) * | 1990-09-18 | 1993-07-07 | Ballard Med Prod | Medical lavage apparatus. |
| EP0549708A4 (en) * | 1990-09-18 | 1994-05-11 | Ballard Med Prod | Medical lavage apparatus |
| GB2266667A (en) * | 1992-05-06 | 1993-11-10 | Product Research Ltd | Disposable hypodermic syringe |
| GB2266667B (en) * | 1992-05-06 | 1996-04-24 | Product Research Ltd | Disposable hypodermic syringe |
| US5980487A (en) * | 1994-05-04 | 1999-11-09 | Product Research Limited | Hypodermic syringe |
Also Published As
| Publication number | Publication date |
|---|---|
| DE7912969U1 (en) | 1979-09-27 |
| FR2455464A1 (en) | 1980-11-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |