JP5406164B2 - Syringe tip cap and syringe assembly - Google Patents

Description

  The present invention relates to a tip cap for closing an opening of a container filled with liquid, and more particularly to a tip cap and syringe assembly of a syringe.

  This application is a continuation-in-part of US Design Application No. 29 / 180,313, filed April 22, 2003, which is incorporated herein by reference.

  Each conventional syringe includes an outer cylinder having an open proximal end and a distal end opposite thereto. A cylindrical wall extends between the ends and defines a substance containing chamber. An elongated tip, commonly referred to as a luer, protrudes from the distal end of the syringe barrel, which has a narrow passage that communicates with the substance containment chamber of the barrel. The inner cylinder is inserted from the opening proximal end of the syringe outer cylinder, and can slide while being fluid-tightly engaged with the cylindrical chamber wall. The inner cylinder slides and moves in the direction of the distal end, thereby pushing out the liquid in the chamber through the passage at the tip. On the contrary, when the inner cylinder moves toward the proximal end, the liquid is sucked into the chamber of the syringe outer cylinder through the passage in the distal end.

  Conventional syringe barrels are usually made of plastic or glass. Glass exhibits a lower gas permeability than plastic. Thus, glass syringe barrels are used for drugs that are particularly susceptible to interaction with ambient gas. Glass shells are also preferably used for drugs that are prefilled into syringe barrels and stored for a significant amount of time before use.

  Such syringes further include a needle assembly that includes a needle cannula, which can have a proximal end, a pointed tip, and a lumen extending axially therethrough. The needle assembly typically includes a receptacle engageable with mounting means on the syringe barrel to selectively fluidly communicate the lumen of the needle cannula with a passage through the tip of the syringe barrel. Alternatively, the needle cannula can be firmly fixed or “implanted” directly into the syringe barrel.

  The drug pre-filled in the syringe barrel must be sealed to prevent contamination and loss of the drug until use. Sealing also prevents medical personnel from being exposed to drugs unnecessarily. In order to prevent drug leakage and avoid contamination when the needle is not embedded in the syringe body, the conventional device is referred to as a tip cap that is mounted over the tip of the distal end of the syringe barrel. Has a stopper or lid. It is particularly important that a good seal is maintained when the prefilled syringe is capped with a tip cap. This is usually accomplished by attaching the tip cap tightly to the syringe. However, if it is too tight, it may be difficult to remove the tip cap. In addition, pre-filled syringes may be autoclaved after filling and capping to ensure the contents are sterile packed. However, autoclaving can also have an interaction between the tip cap and the syringe as a side effect, which can make it more difficult to remove the cap.

  Prior art tip caps are removed from the syringe just prior to using the syringe, and the needle assembly receptacle securely engages the luer and / or luer collar or other attachment means adjacent to the exposed tip of the syringe barrel. Is done. For example, with the configuration sold by the assignee of the present specification under the trademark “Luer-Lok”, the needle receptacle is connected to the luer collar so that the lumen of the needle cannula communicates with the exposed tip of the syringe barrel. Can be threadedly engaged.

  Current tip caps used to seal the liquid opening of the syringe barrel are typically an integral design with a round cap wall design. The mechanical advantage of the screw-type screw cap is that it converts the rotational force into an axial force. As a result, the seal mechanism of the tip cap is tightened to the container luer, and a tight fit is achieved between the seal mechanism and the luer. This forms a tight seal. With current tip caps, at least a portion of the torque required to seal and release the bottle applies a gripping force on the outside of the cap wall for the user to rotate the cap. It is generated by the frictional force generated at the time.

  The problems associated with prior art tip cap designs are sufficient for the user not only to apply a torsional force (torque) to rotate the cap about its axis, but also to keep the cap from slipping. A force perpendicular to the cap wall must also be applied to the contacts to apply a gripping force to grasp the circular cap. This is difficult for some users who lack dexterity and force, especially considering the small size of the normal tip cap, and when the tip cap is too tightly engaged with the syringe barrel. Can be difficult. The difficulty in using a tip cap according to prior art designs is that the user must apply a force perpendicular to the tip cap to simultaneously grasp and rotate the tip cap.

  Accordingly, there is a need for an improved syringe tip cap that can be easily attached and removed by providing a tip cap that can be more easily gripped while simultaneously applying torque to rotate it. Specifically, the non-circular, for example, non-circular, for example, provides the user with a surface for gripping the tip cap and applying a force tangential to the rotation axis to the tip cap without the need for further gripping force It would be advantageous to provide a tip cap having an oval gripping surface.

  In contrast to the conventional devices described above, it has been found that according to the present invention, a tip cap can be constructed that provides the user with a strong mechanical advantage for rotating the cap for attachment to a syringe. It was. Specifically, the tip cap of the present invention comprises a non-circular cross-sectional shape that provides a gripping surface that provides the user with an additional leverage to rotate the cap.

  The present invention provides a syringe tip cap assembly for closing a syringe, such as a prefilled syringe barrel. The tip cap comprises a tip cap body having a non-circular top wall, a base seal surface and a subordinate shaft, which may be threaded to attach the tip cap to the syringe. The opening and closing of the threaded tip cap is accomplished by applying a torque tangential to the rotation axis to the cap and rotating the cap, thereby engaging the screw of the cap and the container to raise and lower the cap. The force applied to the cap is applied by the user gripping the outer periphery of the cap.

  The tip cap of the present invention makes it easier and more effective for the user to apply the rotational force necessary to rotate the cap to open and close the cap. The non-circular gripping region provides a surface that applies a force directly in the tangential direction to the rotation axis of the cap. The force is applied to the tip cap at a distance from the axis tangential to the axis of rotation. Thus, the non-circular tip cap acts as a lever arm that increases the force applied to it. Furthermore, because of the non-circular shape, it is not necessary for the user to apply a normal force to the side of the cap to grip the cap as in prior art designs.

  One advantage of the tip cap of the present invention is to provide the user with an enhanced mechanical advantage for rotating the cap.

  Another advantage of the tip cap of the present invention is that the outer surface of the tip cap has features that improve operability and gripping power for the user and provide a comfortable gripping surface that does not bite into the user's finger. .

  Accordingly, the present invention is directed to a tip cap comprising a base having an upper surface and a lower surface, a main body having a non-circular cross-section upper wall extending from the upper surface, and a hollow shaft extending from the lower surface and attached to the syringe barrel. And

  Various features, objects, benefits and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments, taken in conjunction with the accompanying claims, in conjunction with the drawings. Throughout the drawings, the same reference numeral represents the same component.

It is a perspective view of the tip cap by the embodiment of the present invention. FIG. 2 is a first side view of the tip cap of FIG. 1. It is a 2nd side view of the front-end | tip cap of FIG. FIG. 2 is a top view of the tip cap of FIG. 1. FIG. 5 is a cross-sectional view of a tip cap according to the present invention taken along section line 4a-4a of FIG. FIG. 5 is a cross-sectional view of a tip cap according to the present invention taken along section line 4b-4b of FIG. It is a bottom view of the tip cap of FIG. FIG. 6 is a perspective view of a tip cap according to an embodiment of the present invention having an uneven top wall. FIG. 6 is a perspective view of a tip cap according to an embodiment of the present invention having an uneven top wall. FIG. 7 is a top view of the tip cap of FIG. 6. It is a force diagram in the case of rotating the tip cap by design of a prior art. It is a force diagram in the case of rotating the tip cap by this invention. FIG. 6 is a perspective view of another embodiment of the present invention incorporating a gripping element. FIG. 6 is a perspective view of another embodiment of the present invention incorporating a gripping element. FIG. 6 is a perspective view of another embodiment of the present invention incorporating a gripping element. FIG. 6 is a perspective view of another embodiment of the present invention incorporating a gripping element. FIG. 6 is a perspective view of another embodiment of the present invention incorporating a gripping element. FIG. 6 is a perspective view of another embodiment of the present invention incorporating a gripping element.

  Referring now to the drawings, FIG. 1 shows a tip cap according to the present invention. Specifically, FIG. 1 shows a tip cap 10. As can be seen, the tip cap 10 includes a cap body 12 having a top wall 14 and a seal base 16 subordinate thereto, and a shaft 18 for connection to and removal from the syringe 200. The shaft 18 and the cap body 12 form a single, integral tip cap for receiving a force that causes the tip cap 10 hung on the top wall 14 to rotate and connect to the syringe body. The top wall 14 is a non-circular tubular structure and extends upward from the seal base 16. The seal base 16 is a substantially flat surface having an upper surface 16a and a bottom surface 16b. The top wall 14 is preferably rigidly coupled to the seal base top 16a along at least the majority of its outer periphery, and the shaft 18 is rigidly coupled to the seal base bottom 16b.

  FIG. 2 shows the tip cap 10 according to the present invention viewed from the side along the long axis 40 of the cap body 12. As shown in FIG. 2, the upper wall 14 preferably has the same width as the seal base 16 along the long axis 40 of the cap body 12. A shaft 18 extending downward from the seal base 16 is also shown. The shaft 18 is configured to attach to the luer tip 220 of the syringe 200. The tip 220 of the syringe 200 can be provided with a connector 230, such as a luer locking collar. Connector 230 may include a screw 232 formed therein. Preferably, the shaft 18 has a screw 20 that meshes complementarily with the screw 232 of the connector 230. The screw 20 is configured so as to be appropriately fixed with respect to a predetermined angular displacement of the tip cap 10. This configuration forms a seal around the luer tip 220 by making intimate contact with the interior of the shaft 18. The screw 20 can be configured to cooperate with any known threaded configuration and can increase the retention force to maintain the position of the tip cap 10 relative to the luer tip 220. Alternatively, the shaft 18 may be configured by any other known connection configuration including, but not limited to, a sliding luer connection.

  FIG. 3 shows the tip cap 10 according to the present invention as viewed along the minor axis 42 of the tip cap body 12 from the side. Preferably, as can be seen in FIG. 3, the portion 16 c of the seal base 16 extends radially outward along the minor axis 42 of the top wall 14. The portion 16c can serve as a defense wall against the user's finger moving too far downward with respect to the tip cap 10. Portion 16c can prevent inadvertent contact with the associated syringe body, particularly the portion that is sterilized.

  FIG. 4 shows the tip cap 10 according to the present invention as viewed from above. This figure shows that the top wall 14 is substantially non-circular. Preferably, the top wall 14 is elongated and has a major axis 40 and a minor axis 42. The top wall 14 according to the present invention is preferably formed in a non-circular oval shape, thereby forming an elongated gripping surface 50 formed by the top wall 14. The gripping surface 50 (see, for example, FIG. 2) need not be limited to a surface formed along the long axis 40, and can include a surface formed along the short axis 42. Further, the gripping surface 50 can include surfaces that extend along both the major and minor axes 40, 42. As described with reference to FIG. 9, the use of the non-circular upper wall 14 eliminates the need for the user to grasp the tip cap 10, to apply a rotational force (torque) to the tip cap 10 and to strongly grip the tip cap 10 at the same time. Can be hung on. Further, the non-circular top wall 14 of the present invention eliminates the possibility of tip cap 10 rolling away from the user as often occurs with prior art circular tip caps.

  4a and 4b show a cross-section of the tip cap according to the invention along the section lines 4a-4a and 4b-4b of FIG. As shown in cross sections 4a-4a and 4b-4b, shaft 18 is preferably hollow, has inner and outer walls 54 and 56, respectively, and is open at the bottom end. Preferably, the bore 58 is formed to extend at least partially into the seal base 16 and has a luer tip that extends beyond the bottom surface 16b when the tip cap 10 is attached to the syringe 200 as shown in FIG. Shaped and configured to accept. The inner hole 58 can be shaped on the inside to fit the general shape of the tip or lure. For example, as shown in FIG. 4a, the inner end 59 of the inner bore 58 has a flat shape that is complementary to the shape of the syringe portion to which it is secured. The outer surface 44 of the inner bore 58 can be generally conical as shown to favor the removal of the product from the mold. Moreover, the recessed part 52 recessedly provided in the bottom face 16b is shown in figure.

  FIG. 5 is a bottom view of the tip cap 10 according to the present invention. FIG. 5 shows the bottom surface 16 b of the seal base 16. One or more recesses 52 can be provided in the seal base 16 and recessed in the bottom surface 16b as shown so that the tip cap 10 can be easily removed from the casting machine.

  One or more outwardly extending pieces or tabs 51 can be formed in the form of cantilevers extending from the seal base 16 to facilitate mechanical handling of the tip cap 10 according to the present invention. Should also be noted. The piece or tab 51 allows a machine, such as a “forgiving” machine, to handle the tip cap 10 without engaging the gripping surface 50. Thus, a simpler mechanical configuration for engaging the small pieces or tabs 51 can be used than if the gripping surface 51 needs to be handled. Although four such pieces or tabs are shown in FIG. 5, those skilled in the art will appreciate that the number and arrangement of such structures can be varied as needed.

  As shown in FIGS. 6, 6 a, and 7, the tip cap 10 can be uneven on the surface of the upper wall 14. For example, the tip cap 10 shown in FIG. 6 includes a plurality of ribs 60 on the outer surface of the upper wall 14. The rib 60 forms irregularities on the outer surface of the upper wall 14 in order to provide a strong gripping surface to the user. For those skilled in the art and as will be apparent from the disclosure provided herein, the arrangement and number of ribs can be varied to provide the user with the desired tactile and gripping characteristics. Furthermore, although the surface irregularities are shown as ribs in this embodiment, the surface of the top wall 14 is instead replaced with another type of irregularities or surface structure to provide tactile sensation and further increase gripping force. it can. As understood by those skilled in the art and as shown in FIG. 6a, the top wall 14 may alternatively include, for example, but not limited to, a plurality of small indentations, or a Standex International Corp. of Salem, NH, USA. To other known irregularities including those found in the library maintained under the trademark “MOLD-TECH”.

  Referring now to FIG. 7, the outline of the rib 60 can be seen. Preferably, the rib 60 is disposed on the outer surface of the upper wall 14 along the longer wall portion (arranged along the long axis 40). Thus, the rib 60 is disposed where the user grips the tip cap 10 to rotate it. In addition, the rib 60 further provides a surface that does not bite into the user's finger. As shown in FIG. 7, the cross-sectional contour of the main body 12 of the tip cap 10 is an ellipse having a plurality of grooves 62 formed in the gripping surface 50. Thus, the oval gripping surface 50 does not have a protrusion that is pushed into the user's finger under a high torque attachment / detachment condition. Another unevenness can be arranged at the same position as shown in FIG.

  Referring now to FIG. 8, there is shown a force diagram illustrating the force applied by a user to rotate a prior art cap about its central axis. FIG. 8 shows a circular top wall 80 of a prior art tip cap having a central axis 82 that is grasped by the user's hand 84. The user's hand 84 is shown applying a gripping force 86 perpendicular to the surface of the upper wall 80. In order to rotate the cap, the user must also apply a rotational force (torque) to the tip cap. For example, the user applies a tangential force 88 against the top wall 80 to rotate the tip cap clockwise. Similarly, to rotate the tip cap counterclockwise, the user applies a force 89 tangentially to the axis of rotation of the upper wall 80. The magnitude of the gripping force 86 that must be applied by the user is proportional to the rotational force required to rotate the tip cap. For example, when rotating a tightly tightened tip cap, the user must grip the tip cap more firmly than against a more tightly tightened tip cap.

  FIG. 9 shows a force diagram illustrating the force applied by the user to rotate the tip cap 10 according to the present invention. FIG. 9 is a top view of the tip cap 10 according to the present invention showing the non-circular upper wall 14 having a central axis 90 and being grasped by a user's hand 92. In order to rotate the cap counterclockwise, the user applies a force 94 to the top wall 14. Similarly, the user applies a force 96 to the top wall 14 to rotate the tip cap clockwise. In contrast to prior art designs, a user of the tip cap 10 according to the present invention simply applies a rotational force to the tip cap 10 to engage or disengage it. Large gripping force is not necessary.

  More particularly, the opening and closing of the tip cap provides sufficient force to overcome the force that attempts to hold the tip cap in a position on the cap and the helical screw of the complementary container or other complementary connection configuration. In addition to the tip cap, the cap is rotated to move the cap from either the open or closed position. The force for rotating the screw cap is applied tangentially to the rotation axis at a distance from the rotation axis of the cap. As shown in FIG. 8, in order to rotate a prior art round cap, the cap must be grasped with sufficient force to hold it, as well as turning the cap around the central axis. . Therefore, the force must be applied tangential to the axis of rotation to rotate the cap and perpendicular to the cap surface to hold the cap. The force applied to hold the cap is proportional to the force applied to rotate, which makes it more difficult to apply both gripping force and rotational force, especially when rotating a tightly attached cap, for example. .

  In contrast, the tip cap 10 according to the present invention has an oval grip that provides the user with a lever arm to easily rotate it. Preferably, as shown in FIG. 9, the user grasps the tip cap 10 at an arbitrary point 98 on the upper wall 14 at a distance “d” from the central axis 90 along the long axis 40. A force 94 or 96 is applied directly to the top wall 14. Unlike the round cap, the rotational force (94 or 96) is applied at a right angle to the top wall 14 at the point 98 position so that the user need not grip the tip cap 10 to prevent it from slipping. The top wall 14 acts as a lever arm of length “d”, providing a mechanical advantage for rotating the tip cap 10.

  Even when no threaded connection is provided for the syringe body, a rotational force may be used to remove the tip cap 10. For example, the tip cap 10 can be unscrewed from a luer to which it is attached by a sliding luer connection. Therefore, the above torque advantage is also an advantage in this and similar cases.

  The tip cap 10 of the present invention may be made of a transparent cast thermoplastic material so that the tip of the syringe can be easily seen through the tip cap. Representative materials include, for example, polyethylene, polypropylene, and polyvinyl chloride. It is within the scope of the present invention to provide a transparent tip cap, but it is also within the scope of the present invention to provide a tip cap with a color code that indicates the type of experiment to be performed on the collected sample. .

  Although the tip cap 10 of the present invention has been described in detail with respect to a preferred embodiment having a non-circular elliptical upper wall 14, various modifications of the tip cap upper wall 14 can be made without departing from the scope and spirit of the present invention. It will be apparent to those skilled in the art and from the disclosure provided herein that alternative embodiments are devised. For example, the tip cap 10 may include other changes, such as alternative shapes and additional gripping elements, to enhance torque generation. In addition to the non-circular elliptical shape of the preferred embodiment described above, the alternative shape of the upper wall 14 includes an egg shape that achieves the torque reduction characteristics of the tip cap 10 of the present invention, a polygon such as a square or a rectangle, and the like. It may include non-circular shapes. In addition, another alternative embodiment may include a tip cap top wall 14 with a radially projecting structure disposed about the top wall 14. The protruding structure provides the user with an extended gripping surface 50 that, when rotated by the user, as described above in connection with FIGS. Acts as a lever arm that increases the torque applied to the.

  The gripping element can be configured differently to provide the user with a surface that can be easily gripped when applying torque to the tip cap 10. The gripping element can take a variety of alternative shapes, for example, the tip cap 10 may be fabricated in a star shape and has a radially extending structure disposed along its outer periphery. Also good. Alternatively, the tip cap 10 can be shaped to have a square or rectangle.

  As will be appreciated by those skilled in the art, various configurations can be attributed to the principles of the invention described above. As a non-limiting example, referring to FIGS. 10a-f, an alternative embodiment of a tip cap 10 according to the present invention is shown. FIG. 10a places a flange 104 adjacent to the top wall 14 to provide an extended gripping element to the user, the flange extending radially outward from the top wall to the edge of the seal base 16. An alternative embodiment is shown. However, it should be noted that the size and dimensions of the flange can be varied to provide the user with a sufficiently large surface to apply a force to rotate the tip cap. Preferably, each flange 104 has an outwardly extending radial length that is longer than a respective width extending circumferentially. Furthermore, the additional flange 104 can be used with further variations on the embodiment shown in FIG. 10a. Further, ribs 102 can be provided in the embodiment of FIG. 10a to provide additional gripping elements. It should be noted that the radial distance from the center of the tip cap 10 to the edge of the flange 104 is longer than the radial distance to the edge of the rib 102.

  FIG. 10 b shows another alternative embodiment having two generally arcuate structures 108 protruding from the seal base 16. The arcuate structure 108 is firmly joined together by a support 110 that also extends from the seal base 16. The structure 108 provides a user-friendly surface for applying torque to the tip cap 10. Further, as shown in FIG. 10c, the size and dimensions of the arcuate structure 108 can be varied, for example, to increase the size of the gripping surface. It should be further noted that it will be apparent to those skilled in the art that the embodiment of FIGS. 10b and 10c does not have a receptacle-shaped cap gripping surface. Therefore, in these embodiments, moisture is not retained during the steam autoclave process. In addition, it has the further advantage that it does not tend to be intricate when stored in bulk.

  Referring now to FIG. 10d, in order to provide a user-friendly surface for applying torque to the tip cap 10, it has a central structure 112 extending from the seal base 16 and around the central structure 112. Another alternative embodiment is shown having a plurality of structures 114 that are preferably spaced 90 degrees apart. FIG. 10d may be modified by changing the number and spacing of the outer structures 114 according to the present invention, and the structures 112 and 114 are shown as cylindrical, but any other such as polygons, for example. Shapes may be used.

  In FIG. 10e, the tip cap 10 according to the present invention has another alternative implementation in which the top wall 14 has an increased diameter by corrugating the wall cross section to provide a plurality of ribs 120 spaced around the top wall 14. The form is shown. The ribs 120 are interconnected by an inter-rib curved surface 122 that provides an enhanced gripping surface to the user by changing the angle of the surface gripped by the user. In this way, the user can hold a surface that is not tangential to the rotational axis of the tip cap 10.

  FIG. 10 f shows another alternative embodiment in which the tip cap 10 according to the present invention has a polygonal, rectangular top wall 14 to provide a surface that is easy for a user to grip to apply torque to the tip cap 10. . As will be apparent to those skilled in the art, the dimensions of the rectangular top wall can be varied, for example, to increase the size of the gripping surface, and other polygonal configurations can be used. Furthermore, the polygonal surface of the top wall 14 provides the user with a surface for applying a force perpendicular to the tangent to the axis of rotation.

  While preferred embodiments of the invention have been described so that those skilled in the art may practice the apparatus of the invention, various modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. It will be understood that variations and modifications can be employed. For example, the shape of the top wall can be changed by making the major and minor axes longer or shorter. Alternatively, the top wall can be other non-circular shapes, preferably elongated, such as rectangular. Accordingly, the foregoing description is exemplary and should not be used as limiting the scope of the invention. The scope of the invention should be determined only by reference to the appended claims.

Claims (31)

A tip cap for covering the tip of a syringe for medicine,
The tip cap (10) is viewed at an angle extending from the upper surface (16a) and substantially perpendicular to the upper surface (16a), and a base (16) having an upper surface (16a) and a lower surface (16b). A body (12) having an upper wall (14) that maintains a substantially non-circular cross-section when unforced, and a shaft (18) extending from the lower surface (16b);
The shaft (18) is internally formed in a shape that removably receives the tip of the syringe,
The tip cap (10) is continuously attached to the tip of the syringe until the tip is removably received by the shaft (18) of the tip cap and the tip cap (10) is removed from the syringe. Forming a continuous and uninterrupted sealing surface that seals and contains the drug in the syringe,
The tip cap, wherein the medicine in the syringe can be used through the tip of the syringe with the cap (10) removed.   The tip cap according to claim 1, wherein the non-circular cross section is an ellipse.   The tip cap according to claim 1, wherein the non-circular cross section is oval.   The tip cap according to claim 1, wherein the non-circular cross section is rectangular.   The tip cap according to claim 1, wherein the non-circular cross section comprises a pair of arcuate structures.   The tip cap according to claim 1, wherein the non-circular cross section is a polygon.   The tip cap according to claim 1, wherein the non-circular cross section includes a plurality of cylindrical structures arranged around a central axis of the tip cap. The tip cap according to claim 1, wherein the upper wall has an uneven surface.   The tip cap according to claim 8, wherein the uneven surface includes a plurality of ribs.   The tip cap according to claim 8, wherein the uneven surface includes a plurality of depressions. The tip cap according to claim 1, wherein the upper wall includes a plurality of ribs spaced apart on a circumference.   The tip cap of claim 1, further comprising means for connecting the tip cap to a syringe.   13. A tip cap according to claim 12, wherein the connecting means comprises a sliding luer connection.   13. A tip cap according to claim 12, wherein the connecting means comprises a helical screw. A syringe assembly comprising a syringe having a tip and a tip cap for sealingly covering the syringe tip,
The tip cap (10) is viewed at an angle extending from the upper surface (16a) and substantially perpendicular to the upper surface (16a), and a base (16) having an upper surface (16a) and a lower surface (16b). A body (12) having an upper wall (14) that maintains a substantially non-circular cross-section when unforced, and a shaft (18) extending from the lower surface (16b);
The shaft (18) is internally formed in a shape that removably receives the tip of the syringe,
The tip cap (10) is continuously attached to the tip of the syringe until the tip is removably received by the shaft (18) of the tip cap and the tip cap (10) is removed from the syringe. Forming a continuous and uninterrupted sealing surface that seals and contains the drug in the syringe,
The syringe assembly, wherein the medicine in the syringe can be used through the tip of the syringe with the cap (10) removed. The syringe assembly of claim 15, wherein the top wall has a non-circular elliptical cross section. The syringe assembly of claim 15, wherein the top wall has an oval cross section. The syringe assembly of claim 15, wherein the top wall has a rectangular cross section.   The syringe assembly of claim 15, wherein the non-circular cross-section is comprised of a pair of arcuate structures.   The syringe assembly of claim 15, wherein the non-circular cross section is polygonal.   The syringe assembly according to claim 15, wherein the non-circular cross-section is composed of a plurality of cylindrical structures arranged around a central axis of the tip cap. 16. The syringe assembly according to claim 15, wherein the upper wall is disposed at least partially on the circumference of the upper surface. The syringe assembly of claim 15, wherein the outer surface of the upper wall further comprises a textured surface.   24. The syringe assembly of claim 23, wherein the textured surface comprises a plurality of ribs.   24. The syringe assembly of claim 23, wherein the textured surface comprises a plurality of indentations.   24. The syringe assembly of claim 23, wherein the textured surface comprises a plurality of radially extending flanges.   The syringe assembly of claim 15, further comprising means for connecting the tip cap to a syringe. 28. A syringe assembly according to claim 27 , wherein the connecting means is a sliding luer connection. 28. A syringe assembly according to claim 27 , wherein the connecting means is a helical screw.   16. The syringe assembly according to claim 15, wherein a recessed inner bore extends at least partially through the lower surface of the base.   31. The syringe assembly according to claim 30, wherein the syringe tip extends at least partially into the bore when the tip cap covers the syringe tip of the syringe.

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