JPH05300942A - Retractable needle assembly for intravenous injection - Google Patents

Abstract

PURPOSE: To provide a retractable needle assembly for intravenous injection that can be handled and disposed without giving a hazard to hospital workers. CONSTITUTION: In the retractable needle assembly for intravenous injection of this invention, a canula 12 is attached to a hub 14 within an internal passage formed in a housing 16, the canula 12 and the hub 14 being slidably attached to the housing 16, and the front end of the canula 12 can be manually projected from the housing 16. A flexible with part 18 buckled sideward from the housing 16 is bent upward by hand to disengage a backstop formed within the internal passage from a locking projection on the hub. Then, the front end of the canula 12 is retracted into the housing 16 by hand, and finally, by engaging the locking projection with a locking dent formed in the internal passage, the hub 14 is locked within the housing 16. The locking dent is provided within the passage so that, when the locking projection is locked within the locking dent, the front end of the canula 12 can be completely surrounded.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to an intravenous needle assembly that allows the needle to be retracted into the assembly.

[0002]

BACKGROUND OF THE INVENTION Intravenous needle assemblies have been used in medical practice for many years and are intended to be inserted into body blood vessels and similar channels or lumens for injecting and extracting fluid. It has become. One particular example of this type of IV needle is AFBu on November 20, 1962.
It is described in U.S. Pat. No. 3,064,648 issued to Jan. The device utilizes a pair of flexible airfoils to secure the IV needle to the patient's scalp. The IV needle is secured to this flexible airfoil and is sheathed before use. After use, the needle tip remains exposed, which is dangerous for later handling and disposal.

[0003]

[Problems to be Solved by the Invention] J. Ma on June 19, 1990
U.S. Pat.No. 4,395,011 issued to rtin Hogan says that it can be used with an IV needle to cover the needle after use to protect against accidental needle sticks by someone who later handles the needle. Describes the pod. The needle has a wing or butterfly housing and a sharp cannula fixed to the housing so that it always projects from it. The protective sheath is intended to surround the airfoil and cannula after use, and is therefore relatively bulky and is cumbersome to use because it requires folding to enclose the needle. Thus, the protective sheath disclosed in this U.S. Pat.No. 4,935,001 is essentially an auxiliary device for use with a conventional butterfly cannula to enclose the cannula and housing after use to prevent puncture accidents. is there.

[0004]

SUMMARY OF THE INVENTION A retractable IV needle assembly according to the present invention has a pointed cannula mounted on a hub, the hub sliding into a non-circular cross-section passage extending through an airfoil housing. Freely positioned, the tip of the cannula projects and extends from the housing and is retracted into the housing by a locking projection formed on the hub that engages a sag stop boss formed at one end of the central passage. Locked to prevent it. After use, the airfoils of the housing are folded together and the passage cross-section is deformed at the stop boss so that the locking lugs can overcome the stop, allowing the cannula to be manually retracted into the central passage. You can At this time, the locking protrusion engages with the locking recess formed in the housing passage to lock the tip of the cannula in the passage, thereby preventing accidental sticking when discarding the used IV needle assembly. be able to.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring first to FIG. 1, there is shown a retractable IV needle assembly 10 in accordance with the present invention which is external to a hub 14 mounted within a housing 16. It has a cannula 12 projecting toward it. A pair of airfoil portions 18 project laterally from the housing 16. At the rear of the housing 16 is a bevel 20 which extends upwardly and outwardly from the hub 14 for use in retracting the cannula 12 into the housing 16, as will be described below. Cannula 12 has a sharp tip 24
Have. At the rear of the ramp 20, a flexible tube 22 surrounds the hub 14 and thus an opposite open end 25 of the cannula 12. Referring to FIG. 2, the IV needle assembly 10 includes a protective sheath 26 surrounding the sharp tip 24 of the cannula 12, which when not in use,
It is designed to protect its sharp tip. The sheath 26 is of conventional construction and is removed when the cannula is about to be inserted into a patient's vein.

FIG. 3 is a right side cross section taken along line 3-3 of FIG. 2 and shows the internal structure of the retractable IV needle assembly 10. As shown in FIG. 3, the cannula 12
A single-ended cannula. That is, it has a pointed tip at one end and a hollow blunt end at the opposite end 25, which is suitable for allowing fluid to pass through the cannula 12 or from the cannula 12 to the tube 22. .. In the illustrated structure, the hub 14 is elongated and projects from each of the first end 28 and the second end 30 of the housing.

The housing 16 has a longitudinal central passageway 32 extending therethrough, within which the first passageway is provided.
Adjacent to the end 28, a stop in the form of a depending boss 34 is formed. Adjacent to the housing second end 30 is formed in the central passageway 32 a locking recess 36, which is located on each side thereof in a pair of oppositely disposed, longitudinally aligned and spaced apart. It is bounded by only slopes 38, 40. The function of these slopes will be described later. Hub 14
A locking projection 42 is formed at the end of the No. 1 near the sharp tip 24. As shown in FIG. 3, the locking projection 42 abuts the boss 34 and is blocked from entering the central passage 32 by the boss 34. Similarly, the beveled surface 20 is blocked by the second end 30 of the housing 16 to prevent the hub 14 from entering further through the second end 28 of the housing 16 than in the position shown in FIG. A flexible tube 22 surrounds the open end 25 of the cannula 12 prior to use and, optionally, to the IV needle assembly 10,
Alternatively, it is connected such that it can transfer to the fluid.

The shape of the hub 14 is best shown in FIGS. 4-7, FIG. 4 is a plan view of the hub 14, and FIG. 5 is a right side cross-sectional view taken along line 5-5 of FIG. 6 and 7 are front views taken along lines 6-6 and 7-7 of FIG. 4, respectively. The hub 14 includes a circular cross section 14A located between the locking projection 42 and the hub end adjacent thereto, and the locking projection 42.
And a partial circular cross section 14B located between the slope 20 and the slope 20. The circular cross section 14A is best seen in FIG. 6 and the partial circular cross section 14B is best seen in FIG.

The housing 16 is shown in FIGS. 8, 9 and 10. 9 is a plan view of the housing 16 shown in FIG.
9 is a right side sectional view taken along line 9-9 of FIG. In FIG.
It can be seen that the slope 38 and the insertion side slope 40 are separated by the locking recess 36. As will become apparent later, the locking recess 36 penetrates the body of the housing 16 and forms a hole, as shown in FIGS. However, it is not necessary for the locking recess 36 to extend through the body to form a hole, as shown in FIG.
The slope 3 should be deep enough to lock the locking projections 42 between 0.
All you have to do is 8,40.

As best shown in FIG. 10, airfoil 18
A pair of longitudinal grooves 44 are formed at the connecting portion with the housing 16. These grooves 44 are shown in FIG.
Facilitates upward bending of the airfoil 18 as shown in FIG.
Also, as can be seen in FIG. 10, which is a front view of the housing 16, the boss-shaped stop 34 is usually a locking projection 4.
2 is prevented from entering the central passage 32, and the cannula 12
To act in the projecting position shown in FIG. The boss 34 is shown in cross section in FIG.

In the preferred embodiment shown in FIG. 10, the central passage 32 has a semi-circular cross section and the hub 14 shown in FIG.
The cross section corresponds to the partial circular cross section 14B. By using corresponding partial circular cross-sections in the hub 14 and the central passage 32, rotation of the hub 14 within the central passage 32 is prevented. The inclined surfaces 38 and 40 have flat portions 46 and 48, respectively, and these flat portions 46 and 48 slidably engage with a flat upper surface 50 formed on the partial circular cross section 14B (see FIG. 5). In this way, any rotation of the hub 14 within the housing 16 together with the partial circular cross-sectional shape can be prevented.

To retract the sharpened tip 24 of the cannula 12 into the housing 16, the airfoil 18 is shown in FIG.
Fold upwards together as shown. This movement of the airfoil 18 deforms the cross-sectional shape of the first end 28 of the housing 16 and, as a result, as shown in FIG. To rise. With this arrangement of the housing 16, the locking projection 42 can be moved under the stop 34 in response to the user's finger pressing against the retracting ramp 20 to move the locking projection 42 toward the ramp 38. Once the locking projection 42 has passed the stop 34, the airfoil 18 can be optionally retracted as shown in FIG.
It can be returned to the position shown in. Continued application of finger force to the retracted ramp 20 causes the locking projection 42 to engage the ramp 38, deforming the transverse cross-sectional shape of the housing 16 adjacent thereto such that the locking projection 42 locks as shown in FIG. Make it enter the recess 36. In this arrangement, the locking projection 42 is locked between the two bevels 38, 40 and the sharpened tip 24 of the cannula 12 is the first end 28 of the housing 16.
Retracted inside. The plastic tube 22 can be removed from the hub 14 if not already removed,
The IV needle assembly 10 can be discarded without the risk of accidental puncture with the sharpened tip 24.

The various components of the retractable IV needle assembly 10 are made of conventional medical grade plastic material, with the exception of the conventional stainless steel cannula. For example, the cannula can be made of SS 304 grade stainless steel and the hub can be made in Wilmington, Del.
Made of PD-626 PRO-FAX polypropylene sold by Himont USA, Inc., housing is Alpha Chemical & Plastic of Newark, NJ
It can be made from 2363 grade polyurethane elastomers sold by s Corporation. Here, the above examples of materials from which the components of the retractable IV needle assembly of the present invention can be made are merely illustrative, and the invention as set forth in the claims. It should be understood that the conditions are not taken into consideration.

Similarly, although the drawings show the presently preferred embodiment to use a particular cross-sectional shape with a flat top surface of the hub for the corresponding hub and passage configuration, the hub rotates within the passage. Other forms of blocking can also be used. For example, polygonal cross-sectional shapes such as triangles, squares, hexagons, etc. can be utilized, but these shapes may be difficult to make. Other configurations, such as keyed slots, elliptical cross-sections, etc., can be used to prevent rotation without departing from the scope of the invention as defined in the claims. However, such alternative embodiments may be specifically excluded by the limiting requirements contained in a claim.

[Brief description of drawings]

FIG. 1 is a perspective view of a retractable IV needle assembly according to the present invention.

2 is a plan view of the retractable IV needle assembly of FIG. 1. FIG.

3 is a right side sectional view taken along line 3-3 of FIG.

FIG. 4 is a plan view of an intravenous needle assembly hub for use with the present invention.

FIG. 5 is a right side sectional view taken along line 5-5 of FIG.

6 is a front sectional view taken along the line 6-6 of FIG.

7 is a front sectional view taken along line 7-7 of FIG.

FIG. 8 is a plan view of a housing for use in the present invention with the IV needle assembly hub of FIG.

9 is a right side sectional view taken along the line 9-9 of FIG.

FIG. 10 is a front view of the housing of FIG.

11 is a front view of the housing of FIG. 8 in a position that facilitates withdrawal of the needle.

FIG. 12 is a view similar to FIG. 3, showing the retractable IV needle assembly of the present invention in the retracted position.

[Explanation of symbols]

 10 ... Retractable IV needle assembly 12 ... Cannula 14 ... Hub 16 ... Housing 18 ... Airfoil 20 ... Slope 22 ... Flexible tube 24 ... -Pointed tip 26 ... Protective sheath 28 ... First end 30 ... Second end 32 ... Central passage 34 ... Hanging boss 36 ... Locking recess 38 ... Slope 40 ... ..Slope 42 ... Locking protrusion 44 ... Groove 46 ... Flat part 48 ... Flat part 50 ... Flat upper surface

Claims (10)

[Claims] 1. A housing having a central passage extending longitudinally therethrough, the central passage having a first end and a second end.
A cannula formed in the central passage proximate its first end, an elongated hub, and a cannula having a pointed tip at one end, which is mounted in the hub and extends longitudinally therethrough. At least the tip is arranged to project from the hub, the hub has a locking protrusion formed in the vicinity of the tip, and the hub is slidably installed in the passage. Is usually located between the locking projection and the locking means, and when arranged in this manner, a cannula that is normally adapted to prevent the locking projection from entering the passage, Release means fixed to the outside of the housing adjacent to the stop, which deforms the cross-sectional shape of the passage at the stop during operation and allows the locking projection to pass when pressed towards the locking means Solution that the stop allows Means for actuating when the locking means engages with the locking projection to lock the hub relative to the housing such that the cannula tip is housed within the housing passage. IV needle assembly. 2. The retractable IV needle assembly of claim 1, which is longitudinally aligned with the hub,
Includes a manual means projecting outwardly of the second end of the housing, the manual means sliding the hub longitudinally along the passage to move the locking means upon activation of the release means. A retractable IV needle assembly comprising: 3. The retractable IV needle assembly of claim 1 or 2 including means for inhibiting relative rotation of the hub relative to the housing. 4. The retractable IV needle assembly of claim 3, wherein the rotation blocking means is defined by at least a portion of the passage engaging each other and a complementary non-circular configuration of the hub. A retractable IV needle assembly comprising: 5. The retractable IV needle assembly of claim 4, wherein the cross sectional shape is semi-circular. 6. A retractable IV needle assembly as claimed in any one of claims 1 to 5, characterized in that the locking means comprises a recess formed in the passageway. IV needle assembly. 7. The retractable IV needle assembly of claim 6, wherein the recess of the locking means comprises a pair of opposed bevels longitudinally disposed in the passageway with a recess between the bevels. A retractable IV needle assembly that is formed. 8. The retractable IV needle assembly of claim 2, wherein the manual means is defined by a beveled surface formed on the hub, typically at a second end thereof outside the passage of the housing. From a location beyond the stop when actuating in response to a user pressing with a finger away from the second end to move the hub to actuate the release means. A retractable intravenous injection needle assembly, wherein the locking projection is moved to the locking means. 9. A retractable IV needle assembly as claimed in any one of claims 1-8, wherein the release means are opposed to each other in the hub. The lateral airfoils, when deformed together, deform the passage so that the stop allows the locking projections to pass into the passage towards the locking means. Retractable IV needle assembly. 10. The retractable IV needle assembly of claim 9, wherein the stop is a boss.