CA2470513A1 - Retractable needle - Google Patents
Retractable needle Download PDFInfo
- Publication number
- CA2470513A1 CA2470513A1 CA 2470513 CA2470513A CA2470513A1 CA 2470513 A1 CA2470513 A1 CA 2470513A1 CA 2470513 CA2470513 CA 2470513 CA 2470513 A CA2470513 A CA 2470513A CA 2470513 A1 CA2470513 A1 CA 2470513A1
- Authority
- CA
- Canada
- Prior art keywords
- needle
- housing
- slot
- longitudinal axis
- sliding member
- 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
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
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
-
- 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
- A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
- A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
- A61M5/321—Means for protection against accidental injuries by used needles
- A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
- A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
- A61M2005/3228—Constructional features thereof, e.g. to improve manipulation or functioning the needle being retracted by a member protruding laterally through a slot in the barrel, e.g. double-ended needles
Abstract
Retractable needle having an elongated tubular needle housing having a longitudinal axis and a slot. A needle disposed within the housing. A manually adjustable sliding member engaging the slot in the housing and being secured to the needle, such that when the sliding member is slid along the slot in a first direction, the needle assumes an extended position extended from the housing. When the sliding member is slid along the slot in a second direction, the needle assumes a retracted position retracted within the housing. The slot has a first end at a first axial position relative to the longitudinal axis, a second end at a second axial position relative to the longitudinal axis, the second end being axially and circumferentially spaced from the first end, and a transition portion that extends around the circumference of the housing at an angle to connect the first end and the second end.
Description
TITLE OF THE INVENTION:
Retractable Needle FIELD OF THE INVENTION
The present invention relates to a retractable needle.
BACKGROUND OF THE INVENTION
A retractable needle can be used to deliver an anaesthetic block to a particular nerve.
1 o In order to effectively deliver the anaesthetic block, the needle is placed in a given body cavity close to the nerves. This can be accomplished either anatomically by advancing into a certain position or via the use of an electrical pulse through the needle that is weak enough to only transmit to the nerve when the needle is in close proximity. To get close to the nerve or nerves to be blocked, the needle must first be advanced through tough, resilient tissue. This requires that the needle have a sharp pointed tip. After the needle has passed through the initial layer of tough resilient tissues, it must then pass though a layer of loose fat, connective of tissue, blood vessels and nerves. As the tip of the needle is pointed, there is a danger that the block needle might pass through and traumatize blood vessels or nerves. An even greater danger is that the needle will pass into or through a critical body part such as an eye.
Retractable Needle FIELD OF THE INVENTION
The present invention relates to a retractable needle.
BACKGROUND OF THE INVENTION
A retractable needle can be used to deliver an anaesthetic block to a particular nerve.
1 o In order to effectively deliver the anaesthetic block, the needle is placed in a given body cavity close to the nerves. This can be accomplished either anatomically by advancing into a certain position or via the use of an electrical pulse through the needle that is weak enough to only transmit to the nerve when the needle is in close proximity. To get close to the nerve or nerves to be blocked, the needle must first be advanced through tough, resilient tissue. This requires that the needle have a sharp pointed tip. After the needle has passed through the initial layer of tough resilient tissues, it must then pass though a layer of loose fat, connective of tissue, blood vessels and nerves. As the tip of the needle is pointed, there is a danger that the block needle might pass through and traumatize blood vessels or nerves. An even greater danger is that the needle will pass into or through a critical body part such as an eye.
2 0 The concept of having a retractable needle is known in the art, as illustrated by United States Patent 5,013,304 (Russell et al 1991) and United States Patent 5,456,668 (Ogle 1995). Both the Russell et al and Ogle references disclose syringe bodies having an axial slot. A needle is attached to a manually adjustable sliding member, which engages the slot. When the sliding member is slid in a first direction, the needle is extended from 2 5 the syringe body. When the sliding member is slid in a second direction, the needle is retracted within the syringe body. The retractable needles of Russell et al and Ogle were not developed as Block Needles and, as such, are not particularly suited for block needle applications.
SUMMARY OF THE llVVENTION
What is required is a retractable needle that is better suited to block needle applications and other similar application in which the key concern is tissue damage.
According to a first aspect of the invention, there is provided a retractable needle.
The retractable needle has an elongated tubular needle housing. The housing a longitudinal axis and a slot. A needle is disposed within the housing. A
manually adjustable sliding member engages the slot in the housing. The sliding member is secured to the needle, such that when the sliding member is slid along the slot in a first direction, l0 the needle assumes an extended position extended from the housing and when the sliding member is slid along the slot in a second direction, the needle assumes a retracted position retracted within the housing. The slot has a first end at a first axial position relative to the longitudinal axis, a second end at a second axial position relative to the longitudinal axis.
The second end is axially and circumferentially spaced from the first end, and a transition portion that extends around the circumference of the housing at an angle connects the first end and the second end.
Beneficial results may be obtained by providing the slot with a first portion at the first end extending transverse to the longitudinal axis, the first portion being adapted to 2 0 lock the needle in the extended position and a second portion at the second end extending transverse to the longitudinal axis, the second portion being adapted to lock the needle in the retracted position.
Even more beneficial result may be obtained by providing the housing with an 2 5 attachment end and a remote end, the needle extending from the remote end, and the attachment end being adapted for connection to a syringe.
BRIEF DESCRIPTION OF THE DRAWINGS
SUMMARY OF THE llVVENTION
What is required is a retractable needle that is better suited to block needle applications and other similar application in which the key concern is tissue damage.
According to a first aspect of the invention, there is provided a retractable needle.
The retractable needle has an elongated tubular needle housing. The housing a longitudinal axis and a slot. A needle is disposed within the housing. A
manually adjustable sliding member engages the slot in the housing. The sliding member is secured to the needle, such that when the sliding member is slid along the slot in a first direction, l0 the needle assumes an extended position extended from the housing and when the sliding member is slid along the slot in a second direction, the needle assumes a retracted position retracted within the housing. The slot has a first end at a first axial position relative to the longitudinal axis, a second end at a second axial position relative to the longitudinal axis.
The second end is axially and circumferentially spaced from the first end, and a transition portion that extends around the circumference of the housing at an angle connects the first end and the second end.
Beneficial results may be obtained by providing the slot with a first portion at the first end extending transverse to the longitudinal axis, the first portion being adapted to 2 0 lock the needle in the extended position and a second portion at the second end extending transverse to the longitudinal axis, the second portion being adapted to lock the needle in the retracted position.
Even more beneficial result may be obtained by providing the housing with an 2 5 attachment end and a remote end, the needle extending from the remote end, and the attachment end being adapted for connection to a syringe.
BRIEF DESCRIPTION OF THE DRAWINGS
3 0 These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a side elevation view, in section, of a block needle constructed in accordance with the teachings of the invention;
FIGURE 2 is a side elevation view, in section of the block needle illustrated in FIGURE 1, with the needle in the extended position;
FIGURE 3 is a side elevation view, in section, of the block needle illustrated in FIGURE 1, detached from a syringe in the extended position;
FIGURE 4 is a side elevation view, in section, of the block needle illustrated in FIGURE 1, detached from a syringe in the retracted position; and FIGURE 5 is an end elevation view, in section of the block needle illustrated in FIGURE 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment, a retractable block needle generally identified by reference numeral 10, will now be described with reference to FIGURES 1 through 5.
Structure and Relationship of Parts:
Referring to FIGURE 1, there is shown a retractable needle 10, comprising an 2 0 elongated tubular needle housing 12. Needle housing 12 has a longitudinal axis 14, a slot 16, and a needle 18 disposed within housing 12. The position of needle 18 is controlled by a manually adjustable sliding member 20 that engages slot 16 in housing 12.
Sliding member 20 is secured to needle 18, such that, refernng to FIGURE 4, when sliding member 20 is slid along slot 16 in a first direction 22, needle 18 assumes an extended 2 5 position extended from housing 12, and, referring to FIGURE 3, when sliding member 20 is slid along slot 16 in a second direction 24, needle 18 assumes a retracted position retracted within housing 12. Referring now to FIGURE 5, slot 1 b has a first end 26 at a first axial position 28 relative to longitudinal axis 14, and a second end 30 at a second axial position 32 relative to the longitudinal axis. Second end 30 is axially and 3 0 circumferentially spaced from first end 26, and a transition portion 34 extends around the circumference of housing 12 at an angle to connect first end 26 and second end 30. While the angled nature of transition portion 34 is not apparent from FIGURE 5, it can be seen in, for example, FIGURE 4.
Referring now to FIGURE 3, retractable needle 10 is shown not connected to a syringe 11. Slot 16 has a first portion 36 at first end 26 extending transverse to longitudinal axis 14, where first portion 36 is adapted to lock needle 18 in the extended position as shown in FIGURE 4. A second portion 3$ at second end 30 extends transverse to longitudinal axis 14, where second portion 38 is adapted to lock needle 18 in the retracted position as shown in FIGURE 3.
Referring now to FIGURE 1, housing 12 has an attachment end 40 and a remote end 42. Needle 18 extends from remote end 42, or is slightly retracted within, and attachment end 40 is adapted for connection to syringe 11. It will be understood that syringe 11 and block needle 10 could be formed from one body, in which case attachment end 40 would not be required. It will be appreciated that needle 18 can come of varying lengths and sizes.
Operation:
Needle 18 is moved to the extended position shown in FIGURE 2 by locking sliding member 20 into second portion 38. Block needle 10 is then advanced through layers of tissue 2 o and fat until the desired location is reached. Once the sharpness of needle 18 is no longer needed to penetrate tissue, or once there is a risk of damaging a vessel, a nerve, or other such areas, needle 18 is retracted into the retracted position shown in FIGURE 1 by locking sliding member 20 in first portion 36. Syringe 11 is then used in the desired application.
2 5 It will also be appreciated that housing 12 can be of a non-conductive material and needle 18 can be of a conductive material with a power supply for supplying a low amperage current to needle 18. The low amperage current supplied to needle 18 can be used to localize nerves in which it is placed.
3 0 In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
FIGURE 1 is a side elevation view, in section, of a block needle constructed in accordance with the teachings of the invention;
FIGURE 2 is a side elevation view, in section of the block needle illustrated in FIGURE 1, with the needle in the extended position;
FIGURE 3 is a side elevation view, in section, of the block needle illustrated in FIGURE 1, detached from a syringe in the extended position;
FIGURE 4 is a side elevation view, in section, of the block needle illustrated in FIGURE 1, detached from a syringe in the retracted position; and FIGURE 5 is an end elevation view, in section of the block needle illustrated in FIGURE 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment, a retractable block needle generally identified by reference numeral 10, will now be described with reference to FIGURES 1 through 5.
Structure and Relationship of Parts:
Referring to FIGURE 1, there is shown a retractable needle 10, comprising an 2 0 elongated tubular needle housing 12. Needle housing 12 has a longitudinal axis 14, a slot 16, and a needle 18 disposed within housing 12. The position of needle 18 is controlled by a manually adjustable sliding member 20 that engages slot 16 in housing 12.
Sliding member 20 is secured to needle 18, such that, refernng to FIGURE 4, when sliding member 20 is slid along slot 16 in a first direction 22, needle 18 assumes an extended 2 5 position extended from housing 12, and, referring to FIGURE 3, when sliding member 20 is slid along slot 16 in a second direction 24, needle 18 assumes a retracted position retracted within housing 12. Referring now to FIGURE 5, slot 1 b has a first end 26 at a first axial position 28 relative to longitudinal axis 14, and a second end 30 at a second axial position 32 relative to the longitudinal axis. Second end 30 is axially and 3 0 circumferentially spaced from first end 26, and a transition portion 34 extends around the circumference of housing 12 at an angle to connect first end 26 and second end 30. While the angled nature of transition portion 34 is not apparent from FIGURE 5, it can be seen in, for example, FIGURE 4.
Referring now to FIGURE 3, retractable needle 10 is shown not connected to a syringe 11. Slot 16 has a first portion 36 at first end 26 extending transverse to longitudinal axis 14, where first portion 36 is adapted to lock needle 18 in the extended position as shown in FIGURE 4. A second portion 3$ at second end 30 extends transverse to longitudinal axis 14, where second portion 38 is adapted to lock needle 18 in the retracted position as shown in FIGURE 3.
Referring now to FIGURE 1, housing 12 has an attachment end 40 and a remote end 42. Needle 18 extends from remote end 42, or is slightly retracted within, and attachment end 40 is adapted for connection to syringe 11. It will be understood that syringe 11 and block needle 10 could be formed from one body, in which case attachment end 40 would not be required. It will be appreciated that needle 18 can come of varying lengths and sizes.
Operation:
Needle 18 is moved to the extended position shown in FIGURE 2 by locking sliding member 20 into second portion 38. Block needle 10 is then advanced through layers of tissue 2 o and fat until the desired location is reached. Once the sharpness of needle 18 is no longer needed to penetrate tissue, or once there is a risk of damaging a vessel, a nerve, or other such areas, needle 18 is retracted into the retracted position shown in FIGURE 1 by locking sliding member 20 in first portion 36. Syringe 11 is then used in the desired application.
2 5 It will also be appreciated that housing 12 can be of a non-conductive material and needle 18 can be of a conductive material with a power supply for supplying a low amperage current to needle 18. The low amperage current supplied to needle 18 can be used to localize nerves in which it is placed.
3 0 In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Claims (4)
1. Retractable needle, comprising:
an elongated tubular needle housing having a longitudinal axis and a slot;
a needle disposed within the housing;
a manually adjustable sliding member engaging the slot in the housing, the sliding member being secured to the needle, such that when the sliding member is slid along the slot in a first direction, the needle assumes an extended position extended from the housing and when the sliding member is slid along the slot in a second direction, the needle assumes a retracted position retracted within the housing;
the slot having a first end at a first axial position relative to the longitudinal axis, a second end at a second axial position relative to the longitudinal axis, the second end being axially and circumferentially spaced from the first end, and a transition portion that extends around the circumference of the housing at an angle connects the first end and the second end.
an elongated tubular needle housing having a longitudinal axis and a slot;
a needle disposed within the housing;
a manually adjustable sliding member engaging the slot in the housing, the sliding member being secured to the needle, such that when the sliding member is slid along the slot in a first direction, the needle assumes an extended position extended from the housing and when the sliding member is slid along the slot in a second direction, the needle assumes a retracted position retracted within the housing;
the slot having a first end at a first axial position relative to the longitudinal axis, a second end at a second axial position relative to the longitudinal axis, the second end being axially and circumferentially spaced from the first end, and a transition portion that extends around the circumference of the housing at an angle connects the first end and the second end.
2. The retractable needle as defined in Claim 1, wherein the slot has a first portion at the first end extending transverse to the longitudinal axis, the first portion being adapted to lock the needle in the extended position and a second portion at the second end extending transverse to the longitudinal axis, the second portion being adapted to lock the needle in the retracted position.
3. The retractable needle as defined in Claim 1, wherein the housing has an attachment end and a remote end, the needle extending from the remote end, the attachment end being adapted for connection to a syringe.
4. The retractable needle as defined in Claim 1, wherein the housing is of a non-conductive material and the needle is of a conductive material, and means are provided for supplying a low amperage current to the needle.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2470513 CA2470513A1 (en) | 2004-05-14 | 2004-05-14 | Retractable needle |
| PCT/CA2005/000801 WO2005110517A1 (en) | 2004-05-14 | 2005-05-16 | Retractable needle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2470513 CA2470513A1 (en) | 2004-05-14 | 2004-05-14 | Retractable needle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2470513A1 true CA2470513A1 (en) | 2005-11-14 |
Family
ID=35394004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2470513 Abandoned CA2470513A1 (en) | 2004-05-14 | 2004-05-14 | Retractable needle |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2470513A1 (en) |
| WO (1) | WO2005110517A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3727613A (en) * | 1970-10-09 | 1973-04-17 | Voys Inc Le | Safety catheter placement assembly |
| WO2000020058A1 (en) * | 1998-10-06 | 2000-04-13 | Dean Brian Prestidge | A needle apparatus |
| WO2002055127A2 (en) * | 2000-11-24 | 2002-07-18 | Ckm Diagnostics, Inc. | Nerve stimulator output control needle with depth determination capability and method of use |
| US6726658B2 (en) * | 2002-06-18 | 2004-04-27 | Milestone Scientific, Inc. | Safety IV catheter infusion device |
-
2004
- 2004-05-14 CA CA 2470513 patent/CA2470513A1/en not_active Abandoned
-
2005
- 2005-05-16 WO PCT/CA2005/000801 patent/WO2005110517A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005110517A1 (en) | 2005-11-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |