Needle safety device

Abstract: An apparatus and a method are disclosed for a needle safety device comprising a needle having a proximal and a distal end, a flexible member having a proximal and distal end, and a housing. The member has an aperture to receive the needle. The proximal and distal end of the flexible member contacts the housing at an approximate first point located near the proximal end of the housing and at a second point located near the distal end of the housing.

Description: Field of the Invention This invention relates generally to medical devices and more particularly to a needle safety device for safely closing a needle up a catheter. Background Intravascular devices such as catheter assemblies are generally used for passing fluids between a device such as a syringe or a drip to or from body lumens such as veins or arteries, or other internal target sites. Such an assembly usually includes a hub, a catheter tube, and a needle. An eyelet ring is typically inserted into the catheter. The catheter tube, together with the eyelet ring, is then inserted into an opening in the nose of the hub and is secured to the hub by press fitting the eyelet ring within the nose of the hub. This hub and tube assembly is then mounted over a sharp needle which is in turn attached to a plastic hub. The sharp tip of the needle is used for piercing a body lumen so that access may be gained into the body lumen by the needle and subsequently the catheter. Once the catheter and the needle are located within the body lumen, the needle is removed and discarded while the catheter tube remains in the body lumen. A syringe or a tube of a drip is then attached to the hub so that fluids may be passed through the hub and the catheter between the drip or the syringe and the body lumen. The hub is typically made of materials that provide sufficient rigidity to securely attach drip lines thereto and the catheter tube is usually made of a material which is flexible and soft to minimize bodily injury. To prevent the used sharpened distal tip of a needle from inadvertently piercing the skin of a healthcare worker, a cover may be used in conjunction with an inner shield to cover the needle. U.S. Patent No. 5,344,408, issued to Partika ( Partika ) represents an example of a device used in the art. In Partika, levers and teeth secure the needle such that the needle does not extend outside of a housing. More particularly, one lever arm is configured with an aperture for receiving the needle and the distal end of the lever arm contacts the inner surface of the housing. However, this assembly is not stable since the lever arm contacts only one point of the assembly. The assembly may become detached if a force is applied to the proximal end of the lever arm. It is therefore desirable to have an assembly that increases the stability of the needle within a housing to prevent dislodgement of the assembly. Another needle tip protection device is disclosed in WO 99/08742 It comprises the features of the preamble of claim 1 appended hereto. A housing for a spring clip is provided by the catheter hub. Upon retracting the needle from the hub , the spring clip secures over the needle tip and exits the hub on the needle tip , thereby protecting the needle tip from accidental needle sticks. The present invention provides a method of forming a needle safety device as defined in claim 11 and a needle safety device as defined in claim, 1 , the needle safety device comprising a needle having a proximal and a distal end, a flexible member having a proximal and distal end and an aperture to receive the needle, and a housing. The proximal and distal end of the flexible member contacts the housing at a first point located near the proximal end of the housing and at a second point located near the distal end of the housing. Additional features, embodiments, and benefits will be evident in view of the figures and detailed description presented herein. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. Figure 1 is a cross-sectional view of an embodiment of the invention wherein a member is in an unlocked position. Figure 2 is a cross-sectional view of an embodiment of the invention wherein the member is in a locked position. Figure 3 is an isometric view of an embodiment of the invention wherein a member is in a locked position. Figure 4 is an isometric view of an embodiment of the invention wherein a member is in a locked position. Figure 5 is an enlarged sectional view of a member used in accordance with one embodiment of the present invention. Figure 6 is an isometric view of the member of Figure 1 in accordance with one embodiment of the invention. DETAILED DESCRIPTION A method and an apparatus for securing a needle safety device assembly is disclosed. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without employing these specific details. In other instances, well known processes and processing techniques have not been described in detail in order to avoid unnecessarily obscuring the present invention. Figures 1-4 show one embodiment of the invention. Assembly 10 includes housing 15, needle 45, and member 20. Housing 15 has a proximal end and a distal end. Additionally, housing 15 has opposing sides that are connected to the proximal and distal ends. Member 20 is comprised of a flexible material such as stainless steel shunt stock that allows member 20 to be bent by a variety of methods including using a die to press on member 20 to form an angle at various points in member 20. Member 20 has at least two points in which member 20 is angled. These angles may range from approximately 20° to 90°. The angled points in member 20 are represented by first contact point 30 and second contact point 40. It will be appreciated that by having first contact point 30 and second contact point 40 at different points of the inner surface of housing 15, one embodiment of the invention is able to provide greater stability for holding needle 45 securely in place prior to, during, and after the insertion of needle 45 into a patient. In addition to first and second contact points (30, 40), third contact point 25 and fourth contact point 35 between member 20 and housing 15 provide additional support for securely holding needle 45 in place. Member 20 further has aperture 42 to receive needle 45. Although it is shown that aperture 42 is substantially centrally located in member 20, it will be appreciated that other configurations are also useful to practice the invention. For example, member 20 may have a plurality of angled points that allow member 20 to have more than one location to receive needle 45. Figure 1 and 3 illustrate member 20 in an unlocked position in which needle 45 extends through housing 15 to X 1 . Needle 45 is in the unlocked position during insertion of needle 45 into the patient and while needle 45 is in the patient. The distal and proximal end of member 20 lays against member 20. While the distal end of member 20 is adjacent to member 20, needle 45 is capable of moving within aperture 100 of member 20. Figure 2 illustrates a cross-sectional view and Figure 4 shows an isometric view of the locked position at X 2 of member 20. Once needle 45 is removed from the patient and the catheter (not shown), the distal end of member 20 contacts the beveled end of needle 45 after needle 45 slides out of the catheter (not shown). When the distal end of member 20 contacts the beveled tip of needle 45, a clicking or snapping noise is produced. This noise indicates to the healthcare worker that needle 45 is securely in place within housing 15 and that the healthcare worker is safe from inadvertently piercing his or her skin by the used needle. Figure 5 shows an enlarged sectional view of a member used in accordance with one embodiment of the invention. Figure 5 shows that wall 150 forms aperture 100. Although aperture 100 is shown to have a top portion that is substantially circular in shape and a lower portion that is substantially elliptical in shape, other shapes may also be used. For example, aperture 100 may be circular, . rectangular, egg-shaped, or any other suitable shape for securely holding member 20. Needle 45 slides through the large portion of aperture 100 while needle 45 is in the unlocked position shown in Figure 1 and 3 . Protruding from wall 150 is first arm 140 and second arm 125. Extending at the distal end of first arm 140 is first recess region 105 and extending from second arm 125 is second recess region 110. These recessed regions may also be referred to as indentations and are used to contact the outer surface of needle 45 or alternatively, contact the inner surface of housing 15. Member 20 is generally greater in length than housing 15 to allow for tension to exist in member 20 when it is forced to conform to the inner dimensions of housing 15 which thereby increases the pressure against housing 15. Figure 6 shows an isometric view of member 20. Wall 150 forms aperture 100. First arm 140 and second arm 125 are shown to be at opposing angles. Therefore, first arm 140 may point in the proximal direction of housing 15 (not shown) and second arm 125 may point in the direction of the distal end of housing 15 (not shown). First angle 120 and second angle 130 of the first and second arm generally have an angle at approximately within 10° of each other but different angles may also be accomodated. Distally-directed forces exerted on member 20 will cause an initial sliding movement of the entire assembly 10 ( Figure 1 ) without separating member 20 from housing 15. Continued exertion of a distally-directed axial force on member 20 after member 20 is locked in place with needle 45 will cause no further advancement of needle 45. Accordingly, the claimed invention offers an advantage over the prior art since the amount of force required to dislodge the device is so great that the device in its entirety would likely be destroyed. In the preceding detailed description, the invention is described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the scope of the invention as set forth in the claims. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims: A needle safety device comprising: a needle (45) having a proximal end and a distal end, a housing (15) through which the needle passes, the needle (45) having a first position in which the distal end of the needle extends outside the housing (15) and a second position in which the distal end of the needle is within the housing (15), a member (20) in the housing (15) and having an aperture (42, 100) to receive the needle (45), the member (20) contacting the housing (15) at two opposing sides of an inner surface of the housing (15), the member (20) having a proximal end and a distal end each contacting an outer surface of the needle (45) in the first position of the needle, the distal end of the member (20) blocking the distal end of the needle (45) in the second position of the needle, characterized in that : the member proximal and distal ends have recessed regions (105, 110) to contact the outer surface of the needle in the first position of the needle (45). The needle safety device of claim 1, further comprising: securing means for substantially preventing the member from moving from a first longitudinal position to a second longitudinal position. The needle safety device of any preceding claim, wherein the distal end of the member (20) contacts the inner surface of the housing at a contact point (30, 40) located near the distal end of the housing (15). The needle safety device of any preceding claim, wherein the proximal end of the member contacts the inner surface of the housing at a contact point (35, 25) located near a proximal end of the housing (15). The needle safety device of claim 3 or claim 4, wherein the member is angled at the point of contact approximately in the range of 20° to 90°. The needle safety device of any preceding claim, wherein the member (20) has a substantially Z-shape. The needle safety device of any preceding claim, wherein the member (20) is slidably disposed over the needle (45). The needle safety device of any preceding claim, the member (20) including a distal arm (140) and a proximal arm (125) at the respective distal and proximal ends of the member, the recessed regions (105, 110) being on the arms (105, 110). The needle safety device of any preceding claim, wherein the member (20) is flexible. The needle safety device of any preceding claim, wherein the aperture (42) is a hole (100). A method of forming a needle safety device comprising: placing a member with a proximal end, a distal end, and an aperture therebetween into a housing such that the proximal and distal ends of the member contact the housing at two opposing sides of the housing; disposing a needle with a proximal end and a distal tip through the aperture of the member and through the housing such that the distal tip of the needle extends outside the housing and an outer surface of the needle is in contact with each of the proximal and distal ends of the member such when the needle distal tip is withdrawn into the housing, the member distal end blocks the needle distal tip, characterized by : a recessed region at each of the proximal and distal ends of the member and when the needle distal tip extends outside the housing, the outer surface of the needle is in contact with the recessed regions. The method of claim 11, wherein the member forms at least one angle approximately in the range of 20° to 90°. The method of claim 11 or claim 12, wherein the member is slidably disposed over the needle. The method of any of claims 11 through 13, wherein the flexible member has a substantially Z-shape. The method of any of claims 11 through 14 wherein the member is flexible.

Inventors: ALLMON BUTCH, ALLMON, BUTCH
Applicants: MEDEX INC, MEDEX, INC.
Application year: 2000
Main classification: A61M5
IPC codes: A61M5