TWI426936B - Catheter and introducer needle assembly with safety device - Google Patents

Description

Catheter and introducer needle assembly with safety device

This invention relates to a catheter and introducer needle assembly, and more particularly to a safety device for a catheter and introducer needle assembly.

Intravascular catheters, particularly intravenous catheters (IV catheters), are commonly used to deliver fluids to patients, such as normal salines, various medications, and injectable nutrients, or to extract blood from a patient. The peripheral venous catheter is usually relatively short and measures approximately two inches or less. The most common type of catheter is a peripheral venous catheter that is placed over an introducer needle. The distal venous catheter that is placed over the introducer needle is mounted on an introducer needle with a sharp needle tip. The catheter and the introducer needle are assembled such that the tip of the introducer needle extends beyond the tip of the catheter and the inclined face of the introducen needle tip faces upward.

The catheter and introducer needle assembly is pierced through the patient's skin at a shallow angle into the peripheral blood vessel, which is not directly connected to the heart but is connected to one of the central vessel branches directly connected to the heart. In one technique, the introducer needle and catheter are fully inserted into the blood vessel together. In yet another technique, the introducer needle is partially withdrawn from the catheter after the initial venipuncture. The catheter is then fully inserted into the blood vessel.

After the catheter and introducer needle assembly are inserted into the blood vessel, it is important to confirm that the component is properly positioned in the blood vessel. In order to confirm that the assembly is properly positioned, the medical staff needs to confirm if there is a return blood in the introduction needle and the return chamber at the proximal end of the introduction needle. Typically the return cavity forms part of the catheter adapter. Alternatively, the introducer needle may be provided with a recess or opening in its distal portion such that when the catheter is made of a transparent or translucent material, the blood may be viewed in an annular space between the introducer needle and the catheter. Reflux. Once the correct positioning is confirmed, the medical professional will apply pressure to the blood vessel by pressing down the patient's skin at the tip end of the introducer needle and catheter assembly. The pressure of the finger will occlude further blood flow through the introducer needle. Occlusion of blood flow can also be achieved by a spacer plug. The medical staff pulls the introducer needle to leave the catheter in place and then attaches the fluid delivery device, such as a plain heparin cap, or attaches the head cover to the catheter. Once the introducer needle is withdrawn from the catheter, it will carry a needle tip that is contaminated with blood and must be disposed of properly.

In recent years, there has been a great deal of concern for medical personnel who may be contaminated with the patient's blood. It has been recognized that sputum contaminated with blood must be disposed of immediately. This concern is growing because of the emergence of deadly diseases that are currently not treatable, such as AIDS, which can be passed from one infected person to another through the exchange of body fluids. Therefore, contact with body fluids of people living with AIDS must be avoided. As described above, if the introducer needle has been used to place a catheter into the blood vessels of an AIDS-infected person, the introducer needle is a medium for transmitting the disease. Although medical staff already know that it is necessary to properly treat sputum-stained sputum, it is unfortunate that in some medical settings, such as in an emergency or because of inadvertent or negligent, there is still a contaminated introduction needle that pokes to the medical staff. situation.

In order to solve the above problem of accidental puncture of the needle tip contaminated by the blood, various needle safety devices have been developed.

U.S. Patent No. 6,287,278 discloses an IV catheter assembly which does not have a spring clip for protecting the user. However, the IV catheter assembly is not provided with a housing or a housing surrounding the spring clip. Although the spring clip prevents the user from contacting the needle tip of the introduction needle, it does not prevent the user from contacting the residual blood on the needle tip, in particular, when the introduction needle is provided with some circumferential holes such as a recirculation groove. This is the case. Therefore, the IV catheter assembly of US 6,287,278 is still unsafe for the user.

A catheter and introducer needle assembly is disclosed in U.S. Patent No. 5,215,528, which has a metal clip that prevents the user from being introduced into the needle after the catheter is inserted into the blood vessel and the introducer needle is withdrawn from the catheter. As shown in the drawings of US 5,215,528, the catheter and introducer needle assembly has a plurality of arcuate projections 50 extending from the flanges 48, the arcuate projections defining a receptacle 53 in which the conduit is retained Block 52. One end of the tubular body 38 defines a projection 38a that extends into the catheter hub. The ends of the curved projections 50 include inwardly extending lips 54 that releasably retain the flange 56 of the catheter adapter. The curved projections 50 and lips 54 are designed to engage the flange 56 and make it easier for the user to retract the needle shield from the introduction needle hub by means of the projection 48b as compared to the removal of the catheter hub 52 from the receptacle 53. . However, the above-described mating relationship is not reliable because it depends on manufacturing tolerances. Thus, the detachment between the catheter hub and the introducer needle cover is unpredictable and may be disengaged before the needle tip is safely secured. This unstable behavior is not suitable in some environments where accuracy and reliability are required.

Accordingly, there is still a need in the art for improvements in safety devices for catheters and introducer needle assemblies to overcome the above-discussed shortcomings.

It is an object of the present invention to provide a safety device for a catheter and an introducer needle assembly that prevents the user from contacting the tip of the introducer needle and prevents the user from being inserted after the catheter is inserted into the blood vessel and the introducer needle is withdrawn from the catheter. Touch the glue on the tip of the needle.

It is a further object of the present invention to provide a safety device for a catheter and introducer needle assembly that provides for more precise and reliable detachment between the catheter hub and the needle shield.

The object of the present invention is achieved by a safety device for a catheter and an introducer needle assembly, the catheter and introducer needle assembly comprising: a catheter assembly comprising: a catheter having a proximal end and a distal end; a catheter hub secured to a proximal end of the catheter; an introducer needle assembly, the introducer needle assembly comprising: an introducer needle having a distal tip, a proximal end, and an enlarged portion between the needle tip and the proximal end; the needle hub secured to the introducer needle The safety device is slidably coupled between the catheter assembly and the introducer needle assembly, the safety device comprising: a needle shield defining a longitudinally extending channel, the longitudinally extending channel being provided with an elongated opening At least one spring clip mounted in the longitudinally extending passageway through an elongated opening; and a stop means for blocking an enlarged portion of the introduction needle, wherein the longitudinally extending passageway allows the insertion needle to extend longitudinally through a needle cover, the at least one spring clip being provided with a first snap portion for engaging with the catheter seat, at least a portion of the at least one spring clip being shaped to be introduced Withdrawn from the catheter assembly before the needle is introduced into the compressed, while the introduction of the catheter assembly after the needle withdrawn from the at least a portion of the bounce is released and capture the sharp distal tip of the introducer needle.

The present invention also provides a catheter and introducer needle assembly, the catheter and introducer needle assembly comprising: a catheter assembly comprising: a catheter having a proximal end and a distal end; a catheter hub secured to the proximal end of the catheter; the introducer needle An introducer needle assembly comprising: an introducer needle having a distal tip, a proximal end, and an enlarged portion between the needle tip and the proximal end; a needle hub secured to the proximal end of the introducer needle; a safety device that slides Connected between the catheter assembly and the introducer needle assembly, the safety device comprising: a needle shield defining a longitudinally extending channel, the longitudinally extending channel being provided with an elongated opening; at least one spring clip passing longitudinally a long opening is mounted in the longitudinally extending channel; and a stop means for blocking an enlarged portion of the introducer needle, wherein the longitudinally extending channel is adapted to allow the introducer needle to extend longitudinally through the needle shield, the at least one spring clip a first snap portion is provided for engaging the catheter hub, and at least a portion of the at least one spring clip is shaped to be drawn before the introducer needle is withdrawn from the catheter assembly Compressed into the needle, and the needle is introduced withdrawn from the catheter assembly after the release of at least a portion of the bounce and capture the sharp distal tip of the introducer needle.

As used herein, the terms 〝 and 〝 are described relative to the introducer hub 34 to describe the location on the catheter and introducer needle assembly.

As shown in Figures 1, 2, 8, and 9, the catheter and introducer needle assembly with the security device of the present invention is generally identified by the numeral 10. It includes a catheter assembly 20, an introducer needle assembly 30, and a safety device 40.

The catheter assembly 20 includes a catheter 21 having a proximal end and a distal end, and a catheter hub 24 secured to the proximal end of the catheter 21. Suitable materials for the conduit 21 include, but are not limited to, thermoplastic resins such as polytetrafluoroethylene (PTFE), polyurethane, and the like. More preferably, the conduit 21 is made of a transparent material or at least a translucent material to facilitate viewing of the backflow from the return groove (if any) of the introduction needle 31. Suitable materials for the catheter hub 24 include, but are not limited to, thermoplastic polymer resins such as polycarbonate, polystyrene, polypropylene, and the like.

The introducer needle assembly 30 includes an introducer needle 31 having a sharpened distal tip formed by a beveled surface that is coupled to the introducer needle hub 34. The introduction needle 31 is preferably formed of stainless steel. Preferably, a return groove 33 may be provided on the introduction needle 31. As an alternative, a recirculation chamber may be provided in the introduction needle assembly 30 instead of the recirculation recess 33. The introducer hub 34 can include a radially outwardly extending tab 36 for gripping use. The material introduced into the needle hub 34 may be the same as or different from the catheter hub 24.

As shown in Figures 3a-3d, the safety device 40 includes a needle shield 41, which is preferably made of plastic. As shown in Fig. 2, once the catheter 21 is inserted into the blood vessel and the introducer needle 21 is withdrawn from the catheter 21, the safety device 40 will be held on the needle tip of the introducer needle, thereby protecting the user from needle stick injuries. The needle shield 41 defines a longitudinally extending channel having a proximal end portion 43, a distal end portion 44 and an intermediate groove portion 45. The longitudinally extending passages allow the introduction needle 31 to extend longitudinally through the needle shield 41. The diameter of the proximal portion 43, the distal portion 44 and the intermediate groove portion 45 is at least slightly larger than the diameter of the stem of the introducer needle 31. This allows the stem portion of the introducer needle 31 to easily pass through the proximal end portion 43, the distal end portion 44, and the intermediate groove portion 45. As shown in Figures 3a and 3b, the elongated opening 60 is formed in at least a portion of the intermediate groove portion 45 along the longitudinal direction of the needle shield 41.

The safety device 40 also includes a spring clip 50 that is preferably made of a spring leaf. The spring clip 50 is mounted in the intermediate groove portion 45 through an opening 60. As shown in Figures 4a-4g, the spring clip 50 includes a proximal wall 51, an intermediate wall 54 and a distal wall 53 defining a bore 52 formed therein. 4b (front view of the spring clip 50) is well shown, the proximal wall 51 is connected to one end of the intermediate wall 54, and the proximal wall 51 is substantially perpendicular to the intermediate wall 54. The distal wall 53 is connected to the other end of the intermediate wall 54, and a bend 55 is provided between the distal wall 53 and the intermediate wall 54, which is opposite the proximal wall 51 and the distal wall 53 of the intermediate wall 54. One side stands out. Preferably, the bend 55 can be an inverted V-bend. This bend 55 is used as a snap-on connection to the catheter hub 24. The distal wall 53 is shaped to be compressed by the introducer needle 31 prior to triggering of the spring clip, and is released by the introducer needle 31 after the spring clip is triggered. This will be described in detail below.

Preferably, the distal wall 53 has a portion at its free end, the width of which is preferably narrower than the width of other portions of the distal wall. The reduced width portion can be compressed and bent by the introduction needle 31 before the spring is triggered.

Preferably, the proximal wall 51 is provided with a second snap portion 57 on its free end. For example, the second catching portion 57 can form a U-shaped snap portion by bending the free end of the proximal end wall 51. The U-shaped snap portion will snap together with a corresponding portion formed on the inner wall of the needle shield. The corresponding portion may be a tooth portion 47 provided in the intermediate groove portion 45.

Preferably, the aperture 52 has a reinforcing lip on its periphery for catching an enlarged diameter portion (e.g., a projection) located on the introduction needle bar. As an alternative, the enlarged diameter portion of the introducer needle bar may be smaller than the aperture 52 but larger than the diameter of the proximal portion 43 of the extension channel such that when the introducer needle is withdrawn, the proximal portion 43 will catch the introducer needle The diameter of the needle bar is increased.

As shown in Figures 3a-3d, the spring clip 50 fits within the needle shield 41 through the opening 60 and is captured by the second snap portion 57 of the spring clip 50. The aperture 52 on the proximal wall 51 is adjacent to the needle shield 41. The openings on the end portions are aligned. As best shown in Figure 3b, the inverted V-shaped bend 55 of the spring clip projects beyond the outer wall of the needle shield 41. After the introduction needle is withdrawn from the catheter (i.e., after the spring is triggered), the distal wall 53 will be interposed between the opening of the proximal portion 43 and the opening of the distal portion 44 in the extension channel of the needle shield body 41.

5a-5e show the structure of the needle shield 41 in the first embodiment of the present invention. The needle cover 41 is molded of plastic or other material and has a through hole along the passing axis of the introduction needle 31. Preferably, a toothed engaged portion 47 is provided in the needle cover 41 for engaging with the U-shaped engaging portion 57 of the spring clip 50 to prevent the spring clip 50 from the needle cover 41. In the middle.

Figure 6 shows that after the introducer needle 31 is withdrawn from the catheter, the needle shield 41 and the spring clip 50 are closed at the needle tip of the distal end of the introducer needle. The proximal end of the introduction needle 31 is fixed to the introduction needle hub 30. In the case shown in Fig. 1, the introduction needle hub 34 surrounds the safety device 40 so that it is not visible from the outside.

As shown in FIG. 7, one or more slide rails 49 may be disposed on the outer surface of the needle shield 41. Since the slide rail 49 reduces the contact area between the needle cover 41 and the needle holder 34, it is advantageous for the needle cover 41 to slide out of the needle holder 34.

FIG. 8 is a cross-sectional view showing the state of the catheter and the introducer needle assembly 10 before the introducer needle 31 is withdrawn from the catheter 21, wherein the safety device 40 is enclosed in the introduce needle hub 34 and the catheter hub 24. The proximal portion of the safety device 40 is surrounded by the needle hub 34, while the distal portion of the safety device 40 is surrounded by the catheter hub 24. A recess 25 is provided in the catheter hub 24. The inverted V-shaped catching portion 55 on the spring clip 50 engages with the recess 25. Fig. 9 shows an enlarged cross-sectional view of the catheter and introducer needle assembly 10 in the state shown in Fig. 8, in which the introducer needle 31 is slightly pulled out.

Although the description of the invention has been made with reference to a catheter assembly 20 with a septum 29, the safety device 40 of the present invention can also be used with other types of catheter assemblies, for example, without the isolation plug 29 described. .

In normal use, once the catheter 21 is properly inserted into the blood vessel, the introducer needle 31 will be withdrawn from the catheter 21, which is preferably provided with a blood return groove 33 (see Figures 13 and 14). Figures 10-12 illustrate several stages when the introducer needle 31 is withdrawn from the catheter assembly 20.

In the stage shown in Fig. 10, the return groove 33 of the introduction needle 31 is moved into and surrounded by the isolation plug 29, at which time the distal end wall 53 of the spring clip 50 is still introduced into the needle 31. compression.

In the stage shown in Fig. 11, the distal end wall 53 of the spring clip 50 bounces from the compressed state because the introduction needle 31 no longer obstructs it, so that the distal end wall 53 captures the needle tip of the introduction needle 31 to prevent it from being directed toward the distal end. The direction of the end moves back.

Figure 12 shows another stage in which the needle tip of the introducer needle 31 is captured by the distal wall 53 of the spring clip 50 and cannot slide back toward the distal direction. The enlarged portion 38 of the introducer needle 31 prevents the introducer needle 31 from facing Slide in the proximal direction. An extension projection 46 on the needle shield 41 prevents blood from escaping from the needle tip or return groove 33, if any. As the needle 31 is further drawn toward the proximal end, the inverted V-shaped catch 55 will disengage from the recess 25 of the catheter hub 24. Therefore, the needle shield 41 is released by the catheter hub 24.

In the above embodiment, the enlarged portion 38 located on the introduction needle 31 may be a projection. As shown in Fig. 13, the projection 38 may be a pressing projection, and preferably, the pressing projection is provided with a reflow groove 33. Preferably, the pressing projection can be formed by pressing or pinching two points on the needle 31. The line between the two points must intersect the longitudinal axis of the introduction needle 31.

As shown in Fig. 14, the enlarged portion 38 on the introduction needle 31 can also adopt other forms of construction. For example, the enlarged portion 38 can be an enlarged diameter portion 38 that can be used in the form of a projection as disclosed in U.S. Patent No. 5,215,528, the disclosure of which is incorporated herein by reference. The enlarged diameter portion 38 has an intermediate portion having an outer diameter greater than the outer diameter of the stem of the introducer needle 31, and a tapered proximal portion extending from the intermediate portion toward the proximal end portion of the introducer needle 31. A tapered distal end portion extends from the intermediate portion toward the distal end portion of the introducer needle 31. Although the enlarged diameter portion 38 is set to a symmetrical structure, this is not essential.

The diameter of the enlarged diameter portion 38 should be greater than the outer diameter of the stem of the introducer needle 31, but should be smaller than the inner diameter of the distal end portion 44 of the longitudinally extending passage. This ensures that the introducer needle 31 can be pulled into the safety device 40 in the proximal direction. In order to prevent the introducer needle 31 from being pulled out completely out of the safety device 40 in the proximal direction, the proximal end portion 43 of the longitudinally extending channel should be smaller than the large diameter portion 38, thereby preventing the introduction needle 31 from moving through the proximal portion 43.

As an alternative, and preferably, the diameter of the bore 52 of the proximal wall 51 of the spring clip 50 is slightly larger than the diameter of the stem of the introducer needle 31, but smaller than the diameter of the enlarged diameter portion 38. Thus, when the introducer needle 31 is withdrawn toward the proximal direction relative to the safety device 40, the enlarged diameter portion 38 will become caught at the aperture 52 of the proximal wall 51 rather than being caught at the proximal end portion 43 of the needle shield 41. . This prevents the introduction needle 31 from being completely withdrawn to the outside of the needle shield 41 in the proximal direction.

To place the catheter 21 into the blood vessel of the patient, the medical professional will introduce the needle 31 and catheter 21 substantially longitudinally aligned with the target vessel. The bevel that introduces the needle tip should face away from the patient's skin surface during the puncture. The medical staff will introduce the needle 31 and the catheter 21 into the patient's skin at a shallow angle, preferably less than 35 degrees, so that the needle tip 32 of the introduction needle enters the target blood vessel. The medical staff then preferably observes the return of blood in the return chamber introduced into the needle hub 34 or the return blood located in the return groove 33 of the introducer needle 31.

After confirming the positioning of the introducer needle 31 and the catheter 21 in the target vessel, the medical professional advances the catheter 21 axially along the introducer needle 31 in the blood vessel. In some techniques, the introducer needle 31 can be partially withdrawn in the catheter 21 before the catheter 21 is fully advanced into position in the blood vessel. After the correct positioning of the catheter 21 is achieved, the medical professional presses the finger of the other hand against the patient's skin at the vessel where the distal end of the catheter 21 is located. By pressing their fingers against the patient's skin and applying sufficient pressure, the medical staff will effectively block the flow of blood through the catheter 21, or if the isolation plug 29 is provided in the catheter assembly 20, the flow of blood can also be isolated. The plug 29 blocks. The medical staff then completely withdraws the introducer needle 31 out of the catheter 21 by introducing the needle hub 34 toward the proximal end. This movement causes the needle tip 32 of the introducer needle 31 to enter the safety device 40 in a proximal direction. However, at least during the proximal movement of the introduction needle 31, the inverted V-shaped bend 55 of the spring clip 50 engages as a snap on the recess on the catheter hub such that the needle shield 41 remains engaged with the catheter hub 24. Once the needle tip 32 is in the safety device 40 and the introducer needle 31 is locked therein by the spring clip 50, the sustained proximal directional force acting on the needle hub 34 will cause the inverted V-shaped bend to disengage from the recess of the catheter hub 24. . After the introducer needle 31 and the safety device 40 are removed from the catheter hub 24, the medical professional can initiate a planned treatment by attaching a fluid delivery device, a common heparin cap (PRN), or attaching the head cover to the catheter assembly 20. Then, the introduction needle 31 and the needle cover 41 can be processed in accordance with a simple processing procedure.

Figures 15a-e show a safety device 40 of a second embodiment of the invention, and Figure 16-h shows a spring clip 50 for use in the safety device 40 of the second embodiment. Only the differences from the first embodiment will be described here. The first embodiment is different from the second embodiment in that the spring clip 50 in the first embodiment is divided into two parts in the second embodiment, namely, a first spring clip 50a and a second spring clip 50b. The first spring clip 50a includes an intermediate wall 54 and a distal wall 53, and a bend 55 therebetween. The second spring clip 50b includes a proximal end wall 51 defining a bore 52 formed therein, the proximal end wall 51 being formed with a U-shaped snap portion 57 by bending the free end thereof. In the second embodiment, the first spring clip 50a is mounted into the needle shield 41 by bonding the free end of the intermediate wall 54 to the corresponding portion of the needle shield 41, and the second spring clip 50b passes through the U-shaped snap portion. The snap-fit portion 47 provided in the needle cover 41 is snap-fitted to the needle cover 41. As an alternative, in the second embodiment, the second spring clip 50b may also be replaced by a gasket with a hole whose diameter should be larger than the diameter of the stem of the introduction needle 31 and smaller than the introduction needle. The enlarged portion 38 of 31.

It should be noted that in the present invention, the first engaging portion 55 of the spring clip 50 may take a form different from the first and second embodiments. For example, a spherical hole may be provided in the spring clip instead of the inverted V-shaped bend, and the spherical hole may be engaged with a spherical bearing disposed in the catheter hub 24.

The spring clip 50 of the present invention has two functions. One of the functions is to protect the user from touching the tip of the introducer needle. Yet another function is to provide a snap, such as the inverted V-shaped curved or spherical aperture, for engagement with the catheter hub 24. If these two functions are separated, two different spring clips are needed to achieve this function, resulting in increased costs.

Although the present invention has been described above with reference to the specific embodiments thereof, it should be understood that these embodiments are not to be construed as limiting the scope of the invention. Some variations are made, and the scope of the invention is defined by the appended claims.

10. . . Catheter and introducer needle assembly

20. . . Catheter assembly

twenty one. . . catheter

twenty four. . . Catheter seat

25. . . Notch

29. . . Isolation plug

30. . . Introduction needle assembly

31. . . Introduction needle

32. . . Tip

33. . . Reflow groove

34. . . Introduction needle seat

35. . . Reflow groove

36. . . Extension piece

38. . . Raised, enlarged part

40. . . safety equipment

41. . . Needle cover

43. . . Proximal part

44. . . Remote part

45. . . Intermediate groove

46. . . hole

47. . . Toothed, toothed snap-fit

50. . . Spring clip

50a. . . First spring clip

50b. . . Second spring clip

51. . . Proximal wall

52. . . hole

53. . . Distal wall

54. . . Intermediate wall

55. . . Bending, snap-in

57. . . Card joint

60. . . Opening

The invention will be described hereinafter with reference to the preferred embodiments shown in the drawings.

Figure 1 shows a catheter and introducer needle assembly with a safety device of the invention therein.

Figure 2 shows that after the introduction of the introducer needle, the tip of the introducer needle is enclosed in the safety device of the present invention.

Figures 3a-d illustrate a security device of the present invention comprising a spring clip mounted from the top of the security device into the needle shield and snapped in place by the U-shaped structure of the spring clip, on the spring clip The holes are aligned with the channels on the needle shield. 3a is a top view of the security device, FIG. 3b is a front view of the security device, FIG. 3c is a perspective view of the security device, and FIG. 3d is a side view of the security device.

4a-4g show the shape of the spring clip in the first embodiment, wherein Fig. 4a is a bottom view, Fig. 4b is a front view, Fig. 4c is a top view of the spring clip, and Fig. 4e and Fig. 4g are two perspective views, Figure 4f is a side view of the spring clip.

Figures 5a-e illustrate the construction of a needle shield of the present invention. 5a is a perspective view of the needle shield, FIG. 5B is a side view of the needle shield, FIG. 5c is a bottom view of the needle shield, FIG. 5d is a front view of the needle shield, and FIG. 5e is a top view of the needle shield .

Figure 6 is an enlarged view showing the needle shield and spring clip enclosed on the tip of the distal end of the introducer needle.

Figure 7 shows the needle shield and spring clip. One or more slide rails are provided on the outer circumference of the needle cover main body, so that the needle cover is easily slid due to the reduction of the contact point.

Figure 8 is a cross-sectional view showing the safety device of the present invention enclosed within the introducer needle hub and catheter hub.

Figure 9 shows an enlarged cross-sectional view of the introducer needle and catheter assembly with the needle shield enclosed within the introducer needle hub and catheter hub with the V-bend of the spring clip engaged in a recess in the catheter hub.

Figure 10 shows a stage when the introduction needle is withdrawn, at which the groove on the introduction needle is surrounded by the head of the isolation plug, and the distal wall of the spring clip is still compressed by the introduction of the needle, The inverted V-shaped bend engages in a groove in the catheter hub.

Figure 11 shows a stage in the withdrawal of the introducer needle, at which the tip of the introducer needle moves past the distal wall of the spring clip, which is released by the introducer to release the tip of the introducer needle, preventing the tip of the introducer needle from being caught The needle tip moves in the distal direction while the inverted V-shaped bend still engages in the recess of the catheter hub.

Figure 12 shows a stage in which the introducer needle is withdrawn, wherein the V-bend of the spring clip disengages from the recess of the catheter hub, the needle shield is separated from the catheter hub, and the projection on the introducer needle prevents the introducer needle from approaching the proximal end The direction of movement, the raised portion extending over the proximal end of the needle shield prevents blood from exposing from the recess of the introducer needle.

Figure 13 shows a structure of the introduction needle in which the groove is located after the extrusion projection.

Figure 14 shows a structure of the introducer needle in which the groove is located behind a three-dimensional projection.

Figures 15a-e illustrate a security device in accordance with a second embodiment of the present invention. 15a is a top view of the safety device, FIG. 15b is a front view of the safety device, FIG. 15c is a bottom view of the safety device, FIG. 15d is a perspective view of the safety device, and FIG. 15e is a side view of the safety device .

Figures 16a-h illustrate a spring clip for use in the safety device of the second embodiment. Figure 16a is a left side view of the second spring clip, Figure 16b is a front view of the second spring clip, Figure 16c is a perspective view of the second spring clip, Figure 16d is a right side view of the second spring clip, Figure 16e is a first spring A perspective view of the clip, Fig. 16f is a left side view of the first spring clip, Fig. 16g is a front view of the first spring clip, and Fig. 16h is a right side view of the first spring clip.

10. . . Catheter and introducer needle assembly

twenty one. . . catheter

twenty four. . . Catheter seat

25. . . Notch

31. . . Introduction needle

34. . . Introduction needle seat

41. . . Needle cover

50. . . Spring clip

53. . . Distal wall

55. . . Bending, snap-in

57. . . Card joint

Claims (18)

A safety device for a catheter and introducer needle assembly (10), the catheter and introducer needle assembly (10) comprising: a catheter assembly (20), the catheter assembly comprising: a catheter (21) having a proximal end and a distal end; a catheter hub (24) secured to the proximal end of the catheter (21); an introducer needle assembly (30) including: an introducer needle (31) having a distal tip (32), a proximal end, and a An enlarged portion (38) between the needle tip and the proximal end; a needle hub (34) secured to the proximal end of the introducer needle (31); the safety device (40) slidably coupled to the catheter assembly (20) And between the introduction needle assembly (30), the safety device (40) includes a needle shield (41) defining a longitudinally extending channel, the longitudinally extending channel being provided with an elongated opening (60); at least one a spring clip (50) mounted in the longitudinally extending passageway through an elongated opening (60); and a stop means for blocking an enlarged portion (38) of the introducer needle (31), wherein the longitudinal extension The passageway can allow the introduction needle (31) to extend longitudinally through the needle shield (41), the at least one spring clip (50) being provided with a first snap portion (55) for engaging the catheter hub (24), At least a portion of at least one of the spring clips (50) is shaped to be compressed by the introducer needle before it is withdrawn from the catheter assembly (20), and after the introducer needle is withdrawn from the catheter assembly (20), the At least a portion is released to pop up and capture a sharp distal tip (32) of the introducer needle, wherein the at least one spring clip (50) comprises: a proximal wall (51) , the intermediate wall (54), and the distal wall (53), the proximal wall is connected to one end of the intermediate wall, and the distal wall is connected to the other end of the intermediate wall, and the first engaging portion is located in the middle A bend (55) between the wall and the distal wall, the bend (55) engaging the catheter hub (24), the distal wall (53) acting as the at least a portion of the spring clip (50). A safety device (40) for a catheter and introducer needle assembly (10) according to claim 1, wherein the distal wall (53) has a portion at its free end, the width ratio of the portion The other portion of the distal wall is small in width and the reduced width portion acts as the at least a portion of the spring clip (50). A safety device (40) for a catheter and introducer needle assembly (10) according to claim 1, wherein a U-shaped structure is formed at the free end of the proximal wall (51), the U The configuration is used to engage the teeth (47) on the needle shield (41). A safety device (40) for a catheter and introducer needle assembly (10) according to claim 1, wherein the proximal wall (51) has a hole (52) for introducing a needle (31) A portion can pass through the bore, the inner diameter of the bore being smaller than the enlarged portion (38) of the introducer needle. A safety device (40) for a catheter and introducer needle assembly (10) according to claim 4, wherein the aperture (52) has a reinforcing lip on its periphery, the reinforcing lip being used for The enlarged portion (38) of the introduction needle is caught. A safety device (40) for a catheter and an introducer needle assembly (10) according to claim 1, wherein the enlarged portion (38) It may be one of a pressing projection, a three-dimensional projection, a rolling projection or an iron ring located on the introduction needle (31). A safety device (40) for a catheter and introducer needle assembly (10) according to claim 1, wherein a recess is provided in the catheter hub (24), the bend engaging the recess. A safety device (40) for a catheter and an introducer needle assembly (10) according to claim 1, wherein the first snap portion is a spherical hole at the top of the spring clip, the spherical hole and The spherical bearing disposed in the catheter hub is engaged. A safety device (40) for a catheter and an introducer needle assembly (10) according to any one of claims 1 to 8, wherein one or more guide rails are provided on the outer circumference of the needle shield ( 49). A catheter and introducer needle assembly (10) comprising: a catheter assembly (20) comprising: a catheter (21) having a proximal end and a distal end; and a catheter hub (24) secured to the proximal end of the catheter (21) Introducing a needle assembly (30), the introducer needle assembly comprising: an introducer needle (31) having a distal tip (32), a proximal end, and an enlarged portion (38) between the needle tip and the proximal end; the needle a seat (34) fixed to the proximal end of the introducer needle (31); a safety device (40) slidably coupled between the catheter assembly (20) and the introducer needle assembly (30), the safety device (40) Included is a needle shield (41) defining a longitudinally extending channel, the longitudinally extending channel being provided with an elongated opening (60); at least one spring clip (50) An overlength opening (60) is mounted in the longitudinally extending passage; and a stop means for blocking the enlarged portion (38) of the introduction needle (31), wherein the longitudinally extending passage can accommodate the introduction needle (31) Longitudinally extending through the needle shield (41), the at least one spring clip (50) being provided with a first snap portion (55) for engaging the catheter hub (24), the at least one spring clip (50) At least a portion of the shape is made to be compressed by the introducer needle before the introducer needle is withdrawn from the catheter assembly (20), and after the introducer needle is withdrawn from the catheter assembly (20), the at least a portion is released and bounced a sharp distal tip (32) of the introducer needle, wherein the at least one spring clip (50) comprises a proximal wall (51), an intermediate wall (54), and a distal wall (53), the proximal wall and One end of the intermediate wall is connected, and the distal wall is connected to the other end of the intermediate wall, and the first engaging portion is a bend (55) between the intermediate wall and the distal wall, the bending (55) ) engaging the catheter hub (24) as the at least a portion of the spring clip (50). A safety device (40) for a catheter and introducer needle assembly (10) according to claim 10, wherein the distal wall (53) has a portion at its free end, the width ratio of the portion The other portion of the distal wall is small in width and the reduced width portion acts as the at least a portion of the spring clip (50). A safety device (40) for a catheter and introducer needle assembly (10) according to claim 10, wherein a U-shaped structure is formed at the free end of the proximal wall (51), the U The configuration is used to engage the teeth (47) on the needle shield (41). A safety device (40) for a catheter and introducer needle assembly (10) according to claim 10, wherein the proximal wall (51) has a hole (52) into which the needle of the needle (31) is introduced. A portion can pass through the bore, the inner diameter of the bore being smaller than the enlarged portion (38) of the introducer needle. A safety device (40) for a catheter and introducer needle assembly (10) according to claim 13 wherein the aperture (52) has a reinforcing lip on its periphery for use with the reinforcing lip The enlarged portion (38) of the introduction needle is caught. A safety device (40) for a catheter and an introducer needle assembly (10) according to claim 10, wherein the enlarged portion (38) may be an extruded convex located on the introducer needle (31) One of three, three-dimensional protrusions, rolling protrusions or iron rings. A safety device (40) for a catheter and introducer needle assembly (10) according to claim 10, wherein a recess is provided in the catheter hub (24), the bend engaging the recess. A safety device (40) for a catheter and an introducer needle assembly (10) according to claim 10, wherein the first snap portion is a spherical hole at the top of the spring clip, the spherical hole and The spherical bearing disposed in the catheter hub is engaged. A safety device (40) for a catheter and an introducer needle assembly (10) according to any one of claims 10 to 17, wherein one or more guide rails are provided on the outer circumference of the needle shield ( 49).