GB2441504A - Intravenous cannula - Google Patents
Intravenous cannula Download PDFInfo
- Publication number
- GB2441504A GB2441504A GB0617917A GB0617917A GB2441504A GB 2441504 A GB2441504 A GB 2441504A GB 0617917 A GB0617917 A GB 0617917A GB 0617917 A GB0617917 A GB 0617917A GB 2441504 A GB2441504 A GB 2441504A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cannula
- port
- infusion
- millimetres
- patient
- 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- Withdrawn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
- 238000001990 intravenous administration Methods 0.000 title description 10
- 238000001802 infusion Methods 0.000 claims abstract description 16
- 239000007924 injection Substances 0.000 claims abstract description 11
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000003814 drug Substances 0.000 claims abstract description 10
- 239000000853 adhesive Substances 0.000 claims abstract description 3
- 230000001070 adhesive effect Effects 0.000 claims abstract description 3
- 229940079593 drug Drugs 0.000 claims description 4
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 5
- 210000003462 vein Anatomy 0.000 description 5
- 208000007536 Thrombosis Diseases 0.000 description 2
- 239000003978 infusion fluid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
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
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/06—Body-piercing guide needles or the like
- A61M25/0612—Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders
- A61M25/0637—Butterfly or winged devices, e.g. for facilitating handling or for attachment to the skin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/34—Trocars; Puncturing needles
- A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
- A61B17/3421—Cannulas
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/02—Holding devices, e.g. on the body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/06—Body-piercing guide needles or the like
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Hematology (AREA)
- Anesthesiology (AREA)
- Pulmonology (AREA)
- Biophysics (AREA)
- Surgery (AREA)
- Pathology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
A cannula 2, 3 with a length less than 40 millimetres and preferably 25 millimetres which has a diameter of 1.2 millimetres or more. Preferably the cannula 2, 3 has adhesive covered wings 4 on its lower surface to stick to the patient's skin. The cannula 2, 3 may include unidirectional port valves to allow the flow of medicine in one direction and an additional flap valve attached to the inside of the cannula 2, 3 between an injection port 5 and infusion port 6. The cannula 2, 3 may have an oval bevelled patient end 1. The shorter length of the cannula 2, 3 and bevelled tip 1 may make insertion quicker and easier and reduce the risk of blockages. The valves may prevent backflow and improve the delivery or infusion rate.
Description
Intravenous cannula
Introduction
The invention relates to an intra-venous cannula used to infuse intravenous fluids and/or to inject medicines into a human vein.
Such intravenous cannulae are well established however the current designs are too long.
Typically a cannula with an inner diameter of 1.2 mm or more is 45 mm long. This creates difficulty in placing the complete cannula in a vein. Most of the veins are tortuous and not straight. A longer cannula has higher incidence of causing vein damage as compared a shorter version. Apart from the above, all the cannulae do not provide a sufficient non-return valve. Hence if a medicine is injected through the injection port, it tracks back into the intravenous infusion set rather than going to the patient.
The objects of this invention are: I) to ease the placement of cannula in the vein 2) to increase the flow of intravenous infusion which is paramount in emergency cases 3) to reduce the incidence of cannula blockage due to blood clots 4) to provide an effective way of ensuring the flow of injected medicines and infusion fluid towards the patient.
Material: This cannula is made of standard medical use polyvinylchloride and comes as a single piece.
Design: Figure 1: shows an enlarged side view of the cannula with different parts Figure 2: shows an approximate actual size of the cannula from a side view Figure 3: shows the view from side Figure 4: shows the plan from above Figure 5: shows the plan from behind Figure 6: shows the view from below Figures 7,8,9, 10: show a longitudinal cut section of the cannula explaining its working mechanism
Detailed description of the invention:
As shown in Fig. I no. (I), the cannula has an oval-beveled opening towards the patient end. This increases the surface area of the opening. Due to a larger area there is lesser possibility of blood clot blocking the whole of the opening. Also larger opening allows the infusion fluid to flow faster (by up to 10%) towards the patient.
The cannula fig. I no. (2) is typically 1.2 mm wide or more and 25 mm long. Being shorter than the currently available cannulae of similar width, it increases the rate of flow.
It can be shown by Hagen-Poisuille's equation; that by reducing the length to 25 mm, the rate of flow of fluid can be increased by up to 35%. This characteristic is immensely beneficial in emergency cases when intravenous fluids need to be given as fast as possible.
Short length also makes it easier for the nurses, paramedics and less-trained doctors to place the cannula in the right place. This will increase the success rate of proper placement.
The body of the cannula fig.I no. (3) has two ports. The injection port fig.I no (5) is for injecting medicines and the infusion port fig. I no (6) for infusing fluids. Both these ports have small projections diagonally opposite to each other called Luer-lock attachments.
These attachments help to secure a Luer-lock syringe, infusion device and stops any inadvertent disconnections.
The wings of the cannula body fig.I no (4) are large and provide a wide surface area to fix the cannula in place. The lower surface of the cannula is covered with adhesive which shall stick to the patient's skin once the cannula is in place. This will give added safety against inadvertent dislodgement of the cannula.
Internal design of the cannula: Fig. 7, 8, 9, 10 shows a length-wise cut section of the cannula. The inside of the cannula body contains 3 valves; namely injection port valve, infusion port valve and a flap valve.
The port valves are unidirectional which allow flow in one direction by touching each other.
The flap valve is a circular in shape. It is attached to the inside of the cannula between the injection and infusion ports as shown in fig 8 and 9. This valve normally remains in the position as sown in fig 7 and 8. If there is increased pressure from the injection port, it will drop down as shown in fig 9. Once the injection of the medicine is stopped it shall recoil back to its original position as in fig. 7.
If no infusion device is attached as in fig. 7, the valves shall remain closed stopping any blood leakage from the patient. Once any infusion device is inserted, it shall open and remain open so long as the device is in place as shown in fig. 8. Once any intravenous infusion is started, the flap valve shall remain in its resting position (fig. 7) and prevent any fluid spilling out of the injection port. Also the injection port valve shall remain close giving added protection.
If a medicine is injected from the injection port, without an infusion device as shown in fig.9, the flap valve will drop down. This will stop any amount of medicine flowing out of the infusion port. Along with the flap valve, the infusion port valve shall remain close and offers added protection.
If a medicine is injected whilst the patient is receiving an intravenous infusion, the flap valve remains in the middle position as shown in fig.l0 allowing flow from both the ends.
Claims (2)
- CLAIMS: I) Length of the cannula to be lesser than 40 mm for cannuladiameter of.2mm or more. ideally the length should be 25 mm.
- 2) The lower surface of the wings of the cannula to be covered with adhesive to stick to the patients skin 3) Unidirectional port valves to allow flow of medicines in one direction 4) Flap valve which is attached inside of the cannula between injection port and infusion port 5) An oval beveled opening to the patient end of the cannula
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0617917A GB2441504A (en) | 2006-09-11 | 2006-09-11 | Intravenous cannula |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0617917A GB2441504A (en) | 2006-09-11 | 2006-09-11 | Intravenous cannula |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0617917D0 GB0617917D0 (en) | 2006-10-25 |
| GB2441504A true GB2441504A (en) | 2008-03-12 |
Family
ID=37309852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0617917A Withdrawn GB2441504A (en) | 2006-09-11 | 2006-09-11 | Intravenous cannula |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2441504A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1503429A (en) * | 1975-07-09 | 1978-03-08 | Cordis Corp | Hemostasis cannula |
| US4449973A (en) * | 1982-06-26 | 1984-05-22 | Luther Medical Products, Inc. | Small gauge, pre-split cannula and process for manufacture |
| US4581019A (en) * | 1981-04-23 | 1986-04-08 | Curelaru Johan | Device for introducing a catheter-cannula into a blood vessel |
| GB2274783A (en) * | 1993-02-03 | 1994-08-10 | Graham Cameron Grant | Intravenous infusion set with needle protection |
| US6159179A (en) * | 1999-03-12 | 2000-12-12 | Simonson; Robert E. | Cannula and sizing and insertion method |
| GB2387333A (en) * | 2002-03-07 | 2003-10-15 | Enomoto Co Ltd | Medical device with check valve |
| US20040176763A1 (en) * | 1996-03-22 | 2004-09-09 | Foley Kevin T. | Methods for percutaneous surgery |
-
2006
- 2006-09-11 GB GB0617917A patent/GB2441504A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1503429A (en) * | 1975-07-09 | 1978-03-08 | Cordis Corp | Hemostasis cannula |
| US4581019A (en) * | 1981-04-23 | 1986-04-08 | Curelaru Johan | Device for introducing a catheter-cannula into a blood vessel |
| US4449973A (en) * | 1982-06-26 | 1984-05-22 | Luther Medical Products, Inc. | Small gauge, pre-split cannula and process for manufacture |
| GB2274783A (en) * | 1993-02-03 | 1994-08-10 | Graham Cameron Grant | Intravenous infusion set with needle protection |
| US20040176763A1 (en) * | 1996-03-22 | 2004-09-09 | Foley Kevin T. | Methods for percutaneous surgery |
| US6159179A (en) * | 1999-03-12 | 2000-12-12 | Simonson; Robert E. | Cannula and sizing and insertion method |
| GB2387333A (en) * | 2002-03-07 | 2003-10-15 | Enomoto Co Ltd | Medical device with check valve |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0617917D0 (en) | 2006-10-25 |
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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) |