MXPA00012004A - A needle assembly having an elongate blunting device which allows for venting of air - Google Patents

Abstract

The invention generally relates to a needle assembly of the kind having a needle, an elongate blunting device, a shifting member, and a flash chamber. The needle is of the kind that has a needle proximal end, a sharp needle distal end and a needle canula extending therethrough. The elongate blunting device is at least partially located within the needle canula. The elongate blunting device is of the kind that has a blunting device proximal end, a blunting device distal end, and a blunting device blood flow passage therethrough through which blood can flow from the blunting device distal end to the blunting device proximal end. The shifting member can be actuated to move relative to the needle and, upon movement relative to the needle, causes movement to the elongate blunting device from a retracted position wherein the blunting device distal end is retracted into the needle canula so that the sharp needle distal end can penetrate the body, to an extended position wherein the blunting device distal end extends out of the needle canula so as to prevent the sharp needle distal end from penetrating the body. The flash chamber is of the kind that has an internal volume which in communication with the blunting device blood flow passage so that the blood can flow from the blunting device blood flow passage into the internal volume. The flash chamber is at least partially made of a material through which blood can be seen when located in the internal volume.

Description

NEEDLE ASSEMBLY CONTAINING A PUNTA ROMA DETAILED ALARGED THAT ALLOWS AIR VENTILATION BACKGROUND OF THE INVENTION 5 FIELD OF THE INVENTION This invention relates to a needle assembly having a needle with a distal needle pointed end, and an elongated blunt tip device 10 that can be used to prevent trauma by penetration with the distal end of a pointed needle.

DESCRIPTION THE RELATED TECHNIQUE Needle assemblies are used for various medical purposes, such as removing fluid from a person's body, mainly blood from a vein or artery, providing fluids to a person's body, or inserting an object such as a catheter into a person's body. vein or an artery. 20 A needle assembly includes a needle having a distal end of a pointed needle. The distal tip of a pointed needle is used to pierce a body and is inserted into body fluids. Fluids in the body can include viruses that can transfer diseases to staff medical tuatmma. Once the needle is removed from the body, care must be taken that the distal end of the pointed needle does not penetrate the body of any member of the medical staff. An elongated blunt tip device can be used to prevent penetration of said distal pointed needle tip. The elongated blunt tip device can be located within a needle shower needle cannula and can be moved by a movable member from a retracted position where a distal end of the blunt tip device of the elongate blunt tip retracts within the needle cannula, to an extended position wherein the distal end of the blunt tip device extends towards the needle cannula, thereby preventing the distal end of the pointed needle from penetrating the body of any member of the medical staff. A passage of blood flow through the needle can be provided and an evaporation chamber can be in communication with the blood flow passage so that blood can flow from the blood flow passage to the internal volume of the chamber of evaporation. The evaporation chamber is typically made of a matepal through which the blood can be seen when it is located within the internal volume. The medical staff can then see when the distal end of the pointed needle pierces a vein or artery because blood then flows from the distal end of the pointed needle into the internal volume of the evaporation chamber. For blood to flow from the distal end of the pointed needle into the evaporation chamber, air located within those passages within the needle assembly is required to be vented from these passages. The present invention mainly relates to the ventilation of air from said passages.

BRIEF DESCRIPTION OF THE INVENTION The invention generally relates to a needle assembly of the kind having a needle, an elongated blunt-ended device, a movable member, and an evaporation chamber. The needle is of the kind having a proximal end of needle, a distal end of a pointed needle and a needle cannula extending therethrough. The elongated blunt tip device is at least partially located within the needle cannula. The elongated blunt tip device is of the kind having a proximal end of blunt tip device, a distal end of blunt tip device, and a blood flow passage of the blunt tip device passing through it and through from which blood can flow from the distal end of the blunt tip device to the proximal end of the blunt tip device. The movable element can act to move relative to the needle, and in accordance with the movement related to the needle, causes movement toward the elongated blunt tip device from a retracted position where the distal end of the blunt tip retracts within the needle cannula so that the distal end of the pointed needle can penetrate the body, to an extended position wherein the distal end of the blunt tip device extends toward the needle cannula to prevent the distal end of the pointed needle from penetrating the body. The evaporation chamber is of the kind that has an internal volume that is in communication with the blood flow passage of the blunt-ended device so that blood can flow from the blood flow passage of the blunt-tipped device to the volume internal. The evaporation chamber is at least partly made of a material through w the blood can be seen when it is located in the internal volume. According to one aspect of the invention, an air vent passage is provided at the proximal end of the blunt tip device through w air can be vented from the flow passage of the blunt tip device substantially in a direction of w blood flows through the blood flow passage of the blunt-tipped device. For example, the air vent passage may be an air vent opening having dimensions that allow air to pass through, but substantially prevent the blood from passing. Alternatively, the air vent passage may be provided by a porous element that allows air to pass therethrough and substantially prevents the blood from passing therethrough. In accordance with another aspect of the invention, a passage is provided. of air ventilation through w the air can be ventilated from the blood flow passage of the blunt tip device. When blood flows into the passage of blood flow in the blunt-tipped device, the air vent passage substantially prevents blood from flowing therethrough. According to another aspect of the invention, the elongated blunt tip device may include an elongated blunt tip element and a blunt tip fastener. The elongate blunt tip element is at least partially located within the needle cannula and has a proximal end of the blunt tip element, a distal end of the blunt tip element, and a blood flow passage of the tip element roma through w blood flows from the distal end of the blunt tip element towards the proximal end of the blunt tip element. The elongate blunt tip element has a blood outlet opening of the blunt tip element through w blood can flow into the blood flow passage of the blunt tip element. The blunt tip fastening element is secured to the proximal end of the elongate blunt tip element and has a surface facing the blood outlet opening of the blunt tip element and with a cavity defined between the surface and the exit opening of the blunt tip. blunt point element so that blood can flow into the cavity. The internal volume of the evaporation chamber is in communication with the cavity, so that the blood can flow from the cavity to the internal volume.

BRIEF DESCRIPTION OF THE DRAWINGS The invention is further described by way of example with reference to the accompanying drawings in which similar references indicate similar components and wherein: Figure 1 is a side view in sections of an assembly of 10 needle according to with an embodiment of the invention, wherein an elongated blunt tip device thereof is located in the retracted position; Figure 2 is a view similar to Figure 1 wherein the elongated blunt tip device is in an extended position; Figure 3 is a perspective view of the elongated blunt tip device 15 of Figure 1 showing in greater detail a blood outlet passage; Figure 4 is a perspective view of an elongated blunt tip device having an element forming the passage that is inserted into a groove of a blunt tip fastener; Figure 5 is a perspective view of an elongated blunt-ended device having a porous plug that is inserted into a groove of a blunt-ended fastener, the porous plug serving as an air vent passage; Figure 6 is a perspective view of an elongated blunt tip device having a porous plug inserted into the proximal end of a blunt tip fastener; Figure 7 is a side sectional view of a needle assembly according to an alternative embodiment of the invention; Figure 8 is a perspective view of an elongated blunt-tip device that is used in the needle assembly of Figure 7; Figure 9 is a perspective view of an elongated blunt tip device including a blunt tip fastener having hooks that engage an elongate blunt tip element; and Figure 10 is a perspective view of an elongated blunt tip device that includes a blunt tip fastener having a blunt tip that receives the opening into which the elongated blunt tip element is inserted, the opening having channels that define the exit passages through which blood can flow.

DESCRIPTION OF THE PREFERRED MODALITIES Figure 1 of the accompanying drawings illustrates a needle assembly 20 including a main body 22, a needle 24, a catheter component 26, and an elongated blunt tip device 28. The main body 22 includes an evaporation chamber 30, and an outer flange 32. The evaporation chamber 30 is formed by the first and second tubular portions 34 and 36 respectively. The first and second tubular portions 34 and 36 are in communication with each other to define a continuous internal volume 38. The entire evaporation chamber 30 is made of a transparent or translucent plastic material through which the blood can be seen when located inside the internal volume 38. A proximal end of the first tubular portion 34 is open and a seal in the form of a packing 40 is located in an opening of the proximal end of the first tubular portion 34. A proximal end of a second tubular portion 36 It's open. A plug 42 is inserted into the proximal end of the second tubular portion 36, the latter closing. A center 44 of the plug 42 is made of a porous material, which can allow air to pass through which the blood is substantially prevented from passing. The center 44 typically has pore sizes of approximately 50 microns. The needle 24 has a proximal end of needle 46 and a distal end of pointed needle 48. The proximal end of needle 46 is secured to a distal end of first tubular portion 46. A cannula 50 is formed through needle 24 and an opening is formed in the distal end of the first tubular portion 34 so that the needle cannula 50 is in communication with the internal volume 38 in the first tubular portion 34. The elongated blunt tip device 28 includes an elongate blunt tip element 54 and a blunt tip fastener element 56. The elongate blunt tip member 54 has a proximal end of blunt tip element 58 and a distal end of blunt tip element 60. A passage of blood flow of the blunt tip element 62 through the elongated blunt tip element 54. The blood flow passage of the blunt tip element 62 has a blood entry opening the blunt tip element 64 at the distal end of the element from punta roma 60, and a blood outlet opening of the blunt tip element 66 at the proximal end of the blunt tip element 58. The blunt tip fastener 56 has a distal end of the blunt tip fastener 68 and a proximal end of the blunt tip 68. blunt tip fastener 70. A blood flow passage of the blunt tip fastener 72 is formed within the distal end of the blunt tip fastener element 68. A blunt tip element receiving aperture 74 is also formed. at the distal end of the blunt tip fastener 68. The opening for receiving the blunt tip element 74 is slightly larger in diameter and shorter than the blood flow passage of the blunt tip fastener 72. The proximal end of the blunt tip member 58 is inserted into the opening that receives the blunt tip member 74. The proximal end blunt tip member 58 engages within the aperture that receives the blunt element. ta roma 74 with a friction adjustment or transition adjustment. The distal end of blunt tip element 60 thereby forms a distal end of blunt tip device 60 of elongated blunt tip device 28, and the proximal end of blunt tip fastener 70 forms a proximal end of tip device roma 70 of the elongate blunt-ended device 28. The blood flow passage of the blunt tip element 62 and the blood flow passage of the blunt tip holding member 72 together form a blunt tip blood flow passage. 80 through the elongate blunt-ended device 28. 5 An air vent passage in the form of an air vent opening 82 is formed in the proximal end of blunt tip device 70. The air vent opening 82 extends in a direction in which the blood flow passage of the blunt tip device 80 extends. The blunt tip device blood flow passage 80 has a center line, and the air vent 84 has a center line that substantially coincides with the center line of the blood flow passage of blunt tip device 80. The air vent 82 has a transverse dimension, or a diameter, which is enough for the air to be vented through it, but small enough to avoid Substantially that the blood flows through it. The diameter of the air vent opening 84 is typically about 250 microns or less, and typically has a length of about 2.5 mm. A blood outlet passage 86 is formed on one side of the blunt tip fastener element 56 and extends from the blood flow passage of the blunt tip fastener 72 out of the blunt tip fastener 56.

The ampoule end of the blunt tip element 60 is inserted from the proximal end of the first tubular portion 34 through the packing 40 and from the inside of the needle cannula 50. The ampoule is then inserted into the proximal end of the first tubular portion 34. package 40 is located on an outer surface of the blunt tip fastener 56, sealing thereto. The blood flow passage of the blunt tip fastener 72 is placed in communication with the internal volume 38 via the blood outlet passage 86. As shown in Fig. 1, the elongated blunt tip device 28 is located at a retracted position wherein the end distal to the blunt tip member 60 retracts into the needle cannula 50. A movable member 84 is secured to the proximal end of the blunt tip device 70. The movable member 84 includes a first portion 87 that extends outwardly from the blunt tip fastener element 56, and a second portion 88 extending from the first portion 87 towards the catheter component 26. The movable member 84 has a clipper assembly 90. The movable member 84 is it bends in spring action against it towards the evaporation chamber 30 and is maintained in said position by the external rim 34 with the gripper formation 90 located against the rim and xternal 32. The catheter component 26 includes a catheter 92 and a clamping bracket (luer) 94. A proximal end of the catheter 92 is secured to a distal end of the luer 94. The catheter component 26 has a catheter passage 96 formed in the same. The needle 24 is inserted into the catheter passage 96 so that the catheter component 26 is located around the needle 24. The luer 94 has a luer lock formation 98 that engages a complementary closure formation 100 at a distal end of the movable member 94. The catheter component 26 is thereby connected by the movable member 84 to the elongated blunt tip device 28. The movement of the catheter component along the needle 24 causes corresponding movement of the blunt tip element elonggate 64 along the needle 24. During use, the distal end of the pointed needle 48 is used to pierce a body, such as a vein or an artery of a person. The needle 24 and the catheter 92, both are inserted into the body. The blood flow passage of the blunt tip device 80 and the internal volume 38 are initially filled with air. Blood flows into the needle cannula 50 of the distal end of the pointed needle 48 when the distal end of the pointed needle 48 pierces a vein or an artery. Blood flows from the cannula of the needle 50 through the blood entry opening of the blunt tip element 64 into the blood flow passage of the blunt tip element 62. The blood creates a pressure in the air located in the blood. Blood flow passage of the blunt tip device 80. The air enters the air vent 82 in the same direction as the blood flows into the blood flow passage of the blunt tip element 62. The air then it flows through the air vent 82 and leaves the air vent 82 in the same direction as the direction in which the air enters the air vent 82. The air is ventilated in that efficient manner towards the atmosphere. The blood continues to flow into the blood flow passage of the blunt tipped device 80 from the distal end of the blunt tip member 60 towards the proximal end of the blunt tip fastener element 70 until all the air located within the blotch passage 70 is in the flow region. blood flow of the blunt tip device 80 is ventilated through the air vent 82 and all the The blood flow passage of the elongate blunt-ended device 80 is filled with blood. Due to the dimensions of the air ventilation opening 82, blood within the blood flow passage of the ventilation device 80 is prevented from flowing through the air ventilation opening 82.

Blood flows from the blood flow passage of the blunt tip device 80 through the blood outlet passage 86 into the internal volume 38. A leakage support interface between the blunt tip fastener 56 and the packing 40 prevents blood from leaking through the blunt-tipped clamping element 56. Blood creates a pressure in the air located within the internal volume 38. The air is ventilated through the center 44 of the plug 42 due to the porous nature of the center 34. The blood continues to flow through the internal volume 38 until the air is ventilated through the center 44 and all the total internal volume 38 is filled with - *! ^ la ^ ^ n ^^. blood. However, blood is prevented from flowing through the center 44 of the plug 42. Due to the transparent or translucent material of the evaporation chamber 30, a person can see the blood located within the internal volume 38, allowing the person to determine when the distal end of the pointed needle 48 pierces a vein or artery. Once the catheter 92 is located in a required position, the needle 24 is withdrawn from the catheter component 26 as shown in Fig. 2. The packing 40 slides on the surface of the blunt-tip fastener element 56 allowing that The movement of the elongate blunt-ended device 28 relative to the evaporation chamber 30 is caused. Due to the plug between the catheter component 26 and the elongated blunt-tipped device 28, the elongate blunt-tipped member 54 is maintained in a substantially stationary location. relative to the catheter 92 when the needle 24 is partially withdrawn from the body and partially out of the catheter 92. The elongated blunt tip member 44 thus moves relative to the needle 24 from the retracted position towards an extended position wherein the The distal end of the blunt tip member 60 extends out of the needle cannula 50. Therefore, the movable member 84, driven by the Catheter component 26 for moving relative to needle 24 and movement related to needle 24, causes movement of elongate blunt tip member 54 from the retracted position toward the extended position.

Although the needle 24 is withdrawn from the catheter 92, the forceps formation 90 slides along the outer rim 32. The clamp formation 90 finally fits within its rearward position of a complementary formation 102 and an outer rim 32 due to the spring action of the movable member 84. The closure formation 100 moves out of the luer closure formation 98 thereby disconnecting the catheter component 26 from the movable member 84. Both, both the needle 24 and the elongate element are Remove from the catheter component 26 even if the catheter 92 is maintained within the body. After the needle 24 and the elongated blunt tip element 54 move out of the catheter component 26, the distal end of the blunt tip element 60 prevents the distal end of the pointed needle 48 from penetrating another body. The elongate blunt tip element 54 is prevented from moving from the extended position due to the forceps formation 90, which engages the formation 102 in the outer flange 32. The needle assembly 20 can be safely dispensed with a substantially reduced likelihood that the distal end of the pointed needle 48 can cause penetration. Figure 3 illustrates a portion of the elongated blunt tip device 28 and the movable element 84. The air vent opening 82 is a micro-hole which can be injection molded at the time the tip fastener is molded roma 56 and the mobile element 84. Alternatively, the air opening 82 can be a micro-hole, which is laser-drilled after the blunt tip fastener 56 and the movable member 84 are molded. Figure 4 illustrates a portion of an elongated blunt tip device 28A of according to an alternative embodiment of the invention. The elongated blunt tip device 28A includes a blunt tip fastener 56A and an elongate fastener 54A as in the embodiment described hereinabove. A groove 112 is formed on the side of the blunt tip fastener element 56A. The elongated blunt-ended device 28A further includes a passage-forming element 114. The passage-forming element 114 has an air vent opening 84A therethrough. The air vent 84A is a micro-hole that can be laser-drilled or injection molded into the passage-forming element 114. The passage-forming element 144 is inserted into the slot 112 with a friction fit or an adjustment. of Transition. The passage forming element 114 is thus secured to the blunt tip fastening element 56A in a position where a blood channeling cavity 116 is defined by the surface of the slot 112 in the blunt tip fastening element 56A and by a surface of the passage former 114. Blood flows from the elongate blunt tip member 54A into the blood channel 116 and from the blood channel to the internal volume (reference number 38 in FIG.

W * F "- * ^" ~ figure 1) of the evaporation chamber (reference number 40 in the figure 1 ). An advantage of the elongated blunt-ended device 28A of Fig. 4 is that it can be easily fabricated by means of the separate manufacture of the blunt-tip fastener 56A and the passage-forming element 114 and fabricating the air-venting aperture. 28A under more controlled conditions. Figure 5 itrates an elongated blunt tip device 28B according to another embodiment of the invention. The elongated blunt tip device 28B also includes a blunt tip fastener 26B and an elongate blunt tipper 54B. As with the embodiment of Fig. 4, the blunt tip fastener 26B has a slot 112A. The elongated blunt-ended device 28B further includes a porous plug 120. The porous plug 120 is inserted into the slot 112 with a friction fit or with and a transition fit. The porous plug 120 is thus secured to the blunt tip fastener 56B so that a blood channeling cavity 116A is defined by the surface of the slot 112 and by a surface of the porous plug 120. Blood flows from the element elongated blunt tip 54B toward the blood channel 116A cavity. The porous plug 120 is made of a porous material which allows the air to pass through it but which substantially prevents the blood from passing through it. The porous plug 120 typically has pore sizes of approximately 50 microns with a length of about 2.5 mm and a width of about 1 mm. Therefore, the air can be vented through the porous plug 120 to the atmosphere. The porous plug 120 thus defines an air vent passage through which the air is vented, but substantially prevents blood from flowing therethrough. Blood flows from the blood channeling cavity 116A to an internal volume of the evaporation chamber. Figure 6 itrates an elongated blunt tip device 28C according to another additional embodiment of the invention. The elongated blunt tip device 28C, as in the embodiment described above, includes a blunt tip fastener 56C and an elongate blunt tip member 54 secured thereto. A groove 124 is formed on the side of the blunt tip fastener element 56C. The groove 124 is "blind" in the sense that the groove is formed only at a distal end of the blunt tip fastener element 56C. A blunt tip opening 126 is formed within the proximal end of the blunt tip fastener 56C. The blunt tip opening 126 extends toward the blunt tip fastener element 56C substantially in an opposite direction in the direction in which blood flows through the elongate blunt tip member 54C. A porous plug 128 is inserted into the plug opening 126 in a direction opposite to the direction in which the blood flows through the elongate blunt tip member 34C. An air connection opening 130 interconnects the slot 124 and the blunt tip opening 126. A blood channeling opening is defined within the limits of a distal surface of the porous plug 128, a surface of the opening 130 and surfaces of the opening 132. The air is ventilated through the blood channeling cavity 132, and then through the porous plug 128 due to the porous nature thereof. However, blood is prevented from passing through the porous plug 128. Blood flows from the blood channeling cavity 132 to the internal volume of the evaporation chamber. As shown in Figure 6, a package 144 can be located in a stationary position around the blunt tip fastener 56 C. The package 144 slidably engages and is sealed with the evaporation chamber. The movement of the elongated blunt-tipped device 128 relative to the needle causes the sliding movement of the package 144 against a surface of the evaporation chamber. The modalities described above in this, they can use a similar package 144 instead of a package such as the package 40 of figure 1 which slides on the blunt tip fastener 56. Figure 7 illustrates a needle assembly 220 according to an alternative embodiment of the invention. As with the needle assembly 20 of FIG. 2, the needle assembly 220 includes a main body 222, a needle 224, a catheter component 226, an elongated blunt tip device 228, an outer flange 232, and a movable member 284. The elongate blunt-tipped device 228 includes an elongated blunt tip member 254, and a blunt tip fastener 256. A blood flow passage of the blunt tip fastener element 272 is formed in the blunt fastener element. blunt tip 256. A proximal end of the elongate blunt tip member 254 is inserted into the blood flow passage of the blunt tip fastener element 272. No air vent passage such as the air vent opening 82 is provided. in the embodiment of Fig. 1. Instead, the blunt tip fastener 256 has an inner surface 274 facing the blood outlet opening of the blunt tip member 266 of the flow passage of the nose. ngre of blunt tip member 262 in elongate blunt tip member 254. A cavity 290 is defined between surface 274 and a proximal end of elongate blunt tip member 254. Air is vented through an outlet passage 286 in one side of the blunt tip fastener 256 to an internal volume 238 in an evaporation chamber 230 and through a center 244 of a plug 242. The embodiment of Fig. 7 is the same as the embodiment of Fig. 1 in all the other aspects. Figure 8 illustrates the elongated blunt tip device 228 of Figure 7 in greater detail. It can be seen that the outlet opening 286 is completely defined and limited by the blunt tip fastener 256. Figure 9 illustrates an elongated blunt tip device 300 according to a further embodiment of the invention. The elongated blunt tip device 300 includes a tip fastener 302 and an elongate blunt tip member 304. The blunt tip fastener 302 includes a proximal main support portion 306 and three hooks 308 extending from the portion of main support 306. The main support portion 306 has a surface located between the hooks 308. A proximal end of the elongate blunt tip member 304 is inserted between the hooks 308. The hooks 308 engage the elongated blunt tip element 304 on three different sides of it. A cavity 312 is defined between the surface 310 and the proximal end of the elongate blunt tip member 304. Blood flows from the elongate blunt tip member 304 toward the cavity 312. Three exit openings are defined between the respective pairs of hooks 308 so that blood can flow from the cavity 312 through the outlet openings outside the elongated blunt tip device 300. Figure 10 illustrates a further embodiment of an elongated blunt tip device 330 according to the invention. The elongated blunt tip device 330 includes a blunt tip fastener 332 and an elongate blunt tip member 334. An aperture is formed that receives the blunt tip 336 at a distal end of the blunt tip fastener 332. Blunt tip fastener 332 has a surface 338 on a base of the blunt tip fastening opening 336.

A proximal end of the elongate blunt tip member 334 is inserted into the blunt tip receiving opening 336. A cavity 340 is defined between the proximal end of the elongated blunt tip member 334 and the surface 338. Blood may flow within of the cavity 340. Three channels 342 are formed on the surface of the opening that receives the blunt tip 336 facing a side of the elongate blunt tip element 334. Each channel 342 allows the respective blood outlet passage 344 is defined between a lateral surface of the elongated blunt tip element 334 and an internal surface of the blunt tip fastener 332 blood can flow from the cavity 340 through each blood outlet passage 344 outside the elongated blunt tip device 330. Although certain modalities have been described and shown as an example in the attached drawings, it should be understood that said modalities are merely illustrative rather than limiting of the in Present invention, and that this invention is not limited to the specific constructions and arrangements that are shown and described, since such modifications may occur when they are developed by those skilled in the art.

Claims (12)

NOVELTY OF THE INVENTION CLAIMS

1. A needle assembly comprising: a needle having a proximal end of needle, a distal end of a pointed needle and a needle cannula extending therethrough; an elongated blunt-ended device that is at least partially located within the needle cannula, the elongated blunt-tipped device has a proximal end of blunt tip element, a distal end of blunt tip device, a flow passage of blunt-ended device blood therethrough, by which blood can flow from a distal end of the blunt tip device to the proximal end of the blunt tip device, and a blood outlet aperture of the blunt tip element through which blood can flow out of the blood flow passage of the blunt tip element; a blunt tip fastening element secured to the proximal end of the elongate blunt tip element, the blunt tip fastening element has a surface facing the blood outlet opening of the blunt tip element with a cavity defined between the surface and the blood outlet opening of the blunt tip element so that blood can flow into the cavity; a movable element that can act to move the blunt-ended holding member relative to the needle, the blunt-ended holding member with the movement relative to the needle, causes movement of the elongate blunt-tipped member from a retracted position in wherein the distal end of the blunt tip element is retracted within the needle cannula so that the distal end of the pointed needle can penetrate a body, to an extended position where the distal end of the blunt tip element extends out of the needle cannula to prevent the distal end of the pointed needle from penetrating the body; and an evaporation chamber having an internal volume that is in communication with the cavity, so that the blood can flow from the cavity to the internal volume, the evaporation chamber at least is partially made of a material through which You can appreciate the blood when it is located in the internal volume.

2. A needle assembly according to claim 1, further characterized in that the blunt tip fastener includes a main support portion defining the surface and at least two hooks extending from the main support portion to the backing element. elongated roma tip and are coupled with the elongated blunt tip element on at least two different sides thereof.

3. The needle assembly according to claim 3, comprising at least three of said hooks that engage with the elongated blunt-tipped member on at least three different sides thereof.

4. - The needle assembly according to claim 1, further characterized in that the blunt tip fastening element has an opening which receives the blunt tip element from which the proximal end of the blunt tip element is inserted, a passage of blood outlet that is formed in the blunt tip fastener, through which blood can flow from the cavity to the blunt tip fastener.

5. The needle assembly according to claim 1, further characterized in that the blunt tip fastening element has an opening that receives the blunt tip element into which the proximal end of blunt tip element is inserted, a a blood outlet passage formed between a lateral surface of the elongate blunt tip member and an inner surface of the opening that receives the blunt tip element so that blood can flow from the cavity to the blunt tip fastener element.

6. The needle assembly according to claim 1, further including a clamp formation that adjusts in its position when the elongate blunt tip device moves within the extended position to prevent the tip element from blunting. elongate moves from the extended position to the retracted position. 1.

The needle assembly according to claim 1, which includes a catheter located around the needle, the catheter is insertable, together with the needle inside the body, wherein the needle can be removed from the body and out of the catheter even if the catheter is kept inside the body.

8. The needle assembly according to claim 7, including a clamp formation that adjusts in position when the elongate blunt tip device is moved to the extended position so that the elongate blunt tip element is prevented from move out of the extended position towards the retracted position

9. The needle assembly according to claim 1, which includes a seal around the elongated blunt tip device and between the elongated blunt tip device and the evaporation chamber to avoid substantially leakage of blood out of the evaporation chamber.

10. The needle assembly according to claim 9, further characterized in that the seal slides on a surface of the elongated blunt tip device when the elongated blunt tip device moves from the retracted position to the extended position.

11. The needle assembly according to claim 1, further comprising a porous element that is made of a material that allows air to pass through, but substantially prevents blood from passing through, the element. porous is located and formed so that air is vented therethrough when blood flows into the blood flow passage of the blunt-tipped element due to the porous nature thereof.; but blood is substantially prevented from flowing therethrough.

12. - The needle assembly according to claim 11, further characterized in that the evaporation chamber has a plug opening and the porous element is a porous plug that closes the opening for air to be vented through it, when the chamber of evaporation is filled with blood, but substantially prevents blood from flowing through it, outside the evaporation chamber. ^^^^^^^^^^^^^^^^ g ^^^^^^ & g »^^^ SUMMARY OF THE INVENTION The invention generally relates to a needle assembly of the kind having a needle, an elongated blunt-ended device, a movable member, and an evaporation chamber; the needle between the class having a proximal needle end, a distal end of a pointed needle and a needle cannula extending therethrough; the elongate blunt-ended device is at least partly located within the needle cannula; the elongate blunt-ended device is of the kind having a proximal end of blunt tip device, a distal end of blunt tip device and a blunt point blood flow passage therethrough, where the blood from the distal end of the blunt tip device to the proximal end of the blunt tip device; the movable member can act to move relative to the needle and, upon relative movement of said needle, causes movement to the elongated blunt tip device from a retracted position where the distal end of the blunt tip retracts within the cannula needle so that the distal end of the pointed needle can penetrate the body, to an extended position where the distal end of the blunt tip device extends out of the needle cannula to prevent the distal end of the needle from penetrating the body; the evaporation chamber is of the kind that has an internal volume, which is in communication with the blood flow passage of the blunt-ended device so that the blood _ can flow from the blunt point device blood flow passage to the internal volume; the evaporation chamber is at least partly made of a material through which the blood can be seen when it is located in the internal volume. RM / rcp * pbg * igp * jtr * cgm * jtc P00 / 1705