Safety vacuum syringe for blood sampling conformed to ergonomics

Abstract: The present invention relates to a safety vacuum syringe for blood sampling conformed to ergonomics, mainly comprises: a hollow barrel (10), the barrel has a reduced inlet (12) disposed on the top end thereof and a guiding slit (14) disposed at the flank side thereof. A reduced lining tube (20) is installed in the barrel, an eccentric reduced portion (23) is eccentrically disposed on the top end of the reduced lining tube and has an opening (24) at the lower end thereof, the eccentric reduced portion is wedged and fixed in the reduced lining tube and projects out of the reduced inlet. Besides, a needle head (30) is fixedly covered on the eccentric reduced portion, a through guiding hole (222) is disposed at the center of the eccentric reduced portion to position a type needle (26) therein, a lower needle tip (262) of the needle is positioned at the central axis in the reduced lining tube, a press plate (21) is connected to said reduced lining tube (20) at the outer flank side thereof and is positioned in the guiding slit (14). And a vacuum tube (40) is disposed in the barrel, an elastic plug (42) is covered on an opening at the upper side of the vacuum tube. The needle head (30) of the present is eccentrically disposed to conform completely to ergonomics, enabling the angle of blood sampling to be lowered to make blood sampling more convenient, and the conventional products can still be used in the invention such as the needle head and the vacuum tube to avoid extra molding expense.

Description: The present invention relates to a safety vacuum syringe for blood sampling conformed to ergonomics, and more particularly to the syringe that not only conforms to ergonomics in use but may receive the conventional needle head and the vacuum tube so as to lower production cost. Many viruses and diseases or bodily functions can be examined by a blood test, which makes the blood test to be a regular and frequent job. In preventing a patient from infecting lethal virus or germ, the selection of blood sampling tool will be very important during a blood sampling process. Therefore, in order to make sampling safer, blood sampling must have some degree of improvement. The needle head of a conventional blood sampling syringe, as revealed in U.S. Patent 5,423,758, is disposed at the central axis of the front end of the syringe. During a blood sampling process, the needle of a syringe is stuck into a patient's vein to draw blood from the vein. But the angle between the syringe and the skin surface of a human body is large when blood sampling is processed because the needle head is at the center of syringe. The needle head is difficult to be inserted into the vein to draw blood. This is specially true for the patients whose blood vessels are thinner because it is easier for the needle to pass through the blood vessel. Thus, blood sampling cannot be done smoothly. The U.S. patent 6,152,901 discloses a blood sampling device comprising a tubular body including a side wall provided with at least one longitudinal slot ending in rear and front enlargements, and a front transverse wall provided with an orifice, and a cannula mounted on a slide. The slide is displaceable in the tubular body between a rear end position in which the front part of the cannula are situated inside the tubular body and a front end position in which the front part of the cannula passes through the orifice in the transverse wall. One objective of the present invention is to provide a savety vacuum syringe for blood sampling conformed to ergonomics, whereby a needle head is eccentrically disposed at the front end of a syringe to lower the blood sampling angle during the blood sampling process allowing blood sampling to be done smoothly. Another objective of the present invention is to provide a safety vacuum syringe for blood sampling, wherein an inner needle tip of the needle head has a step shape comprising two right angles so that it can be positioned at the center of the needle head to fit the traditional vacuum blood collecting cup. Still another objective of the present invention is to provide a conventional needle head that can be used according to a users' need. According to a first embodiment as claimed, a safety vacuum syringe for blood sampling conformed to ergonomics, mainly comprises a hollow barrel, a reduced lining tube and a vacuum tube. The hollow barrel has a reduced inlet disposed on the top end thereof. The reduced lining tube is installed in said hollow barrel, an eccentric reduced portion being eccentrically disposed on the top end of said reduced lining tube and having an opening at the lower end thereof. Said eccentric reduced portion being wedged and fixed in said reduced lining tube. Furthermore, a through guiding hole is disposed at the center of said eccentric reduced portion, and said hollow barred comprises a guiding slit disposed at the flank side thereof. A press plate is connected to said reduced lining tube at the outer flank side thereof and being positioned in said guiding slit. According to the invention, the eccentric reduced portion projects out of the reduced inlet and a needle head is fixedly covered on said eccentric reduced portion. Furthermore, a step shaped needle comprising two right angles is positioned in said through guiding hole, and a lower needle tip of said needle is positioned at the central axis in said reduced lining tube. According to a second embodiment as claimed, a safety vacuum syringe for blood sampling conformed to ergonomics, mainly comprises a hollow barrel, a reduced lining tube and a vacuum tube. The hollow barrel has a reduced inlet disposed on the top end thereof. The reduced lining tube is installed in said hollow barrel, an eccentric reduced portion being eccentrically disposed on the top end of said reduced lining tube and having an opening at the lower end thereof. Said eccentric reduced portion being wedged and fixed in said reduced lining tube. Furthermore, a through guiding hole is disposed at the center of said eccentric reduced portion, and said hollow barred comprises a guiding slit disposed at the flank side thereof. A press plate is connected to said reduced lining tube at the outer flank side thereof and being positioned in said guiding slit. According to the invention, the eccentric reduced portion projects out of the reduced inlet and a needle cannula is located in said through guiding hole. Furthermore, a step shaped needle comprising two right angles is positioned in said through guiding hole, and a lower needle tip of said needle being positioned at the central axis in said reduced lining tube. The present invention can be better understood by detailed description of the following drawings, in which: FIG. 1 is a longitudinal sectional view of a preferred embodiment of the present invention before a needle holder is mounted on a syringe; FIG. 2 is a longitudinal sectional view of a preferred embodiment of the present invention after a needle holder is mounted on a syringe; FIG. 3 is a side view of a preferred embodiment of the present invention, showing a guide groove. FIG. 4 is a longitudinal sectional view of a preferred embodiment of the present invention, showing the structure inside; FIG. 4A is a sectional view of a preferred embodiment of the present invention when viewed along the section line of FIG 4; FIG. 5 is an explosive view of a reduced lining tube; FIG. 6 is a longitudinal sectional view of a preferred embodiment of the present invention during use; FIG. 7 is a longitudinal sectional view of a preferred embodiment of the present invention, showing a condition withdrawing a reduced lining tube back; FIG. 8 is a longitudinal sectional view of a preferred embodiment of the present invention, showing a needle head being directly inserted into an eccentric reduced portion; FIG. 9 is a longitudinal sectional view of another example of the present invention, showing a press plate being separated from a syringe; FIG. 10 is a longitudinal sectional view of another example of the present invention, showing a press plate being wedged into a syringe; FIG. 11 is an explosive view of the front part of another example of the present invention; FIG. 12 is a perspective view of the front part of another example of the present invention; FIG. 13 is a longitudinal sectional view of another example of the present invention during use; FIG. 14 is a schematic longitudinal sectional view of another example of the present invention, showing a needle seat being separated from a syringe; and FIG. 15 is a schematic longitudinal sectional view of another example of the present invention, showing a needle seat being wedged into a syringe. DETAILED DESCRIPTIONS OF THE INVENTION As shown in FIG. 1, 2 and 3, the present invention comprises a hollow barrel 10 a reduced inlet 12 eccentrically disposed at the top end of the barrel 10 and a guide slit 14 at the flank side of the barrel 10. The barrel comprises a reduced lining tube 20, an eccentric reduced portion 22 is disposed at a position away from the center of the top end of the reduced lining tube 20 and an opening 24 is disposed at the bottom thereof. The eccentric reduced portion 22 can be embedded into the reduced inlet 12 and projects out of the reduced inlet 12. A needle head 30 can be wedged onto the eccentric reduced portion 22, and a through guiding hole 222 is disposed at the center of the eccentric reduced portion 22 so that a step shaped needle 26 comprising two right angles can be fixed therein and a lower needle tip 262 of the needle 26 can be placed at the central axial line of the reduced lining tube 20. A fixing seat 28 is disposed at the center of the inner section of the reduced lining tube 20 for receiving and fixing the needle 26 therein. As shown in FIG. 5, a press plate 21 is further attached to the reduced lining tube 20 at the outer surface thereof and positioned in the guiding slit 14 to be utilized to drive the reduced lining tube to move in the longitudinal direction of the barrel 10. A hook-shaped flange 16 is further disposed at a proper position of the inner surface of the barrel 10 so as to position the reduced lining tube 20 at the top end of the barrel 10 and not to slide loosely therein. Furthermore, at least one circular flange 224 is disposed around the eccentric reduced portion 22 and at least one circular groove 124 is disposed around the inner surface of the reduced inlet 12 to accommodate and position the circular groove 124. A plurality of small slits 23 are cut around lower side of the reduced lining tube 20, enabling the lower end of the reduced lining tube to maintain its proper elasticity. A vacuum tube 40 is further disposed inside the barrel 10, and an elastic plug 42 is fixedly covered in an opening that is at the top end of the vacuum tube 40. The vacuum tube 40 is convertibly available. Please refer to FIG. 6, when processing a blood sampling; the needle head 30 is inserted into the vein of a patient, and the vacuum tube 40 moves toward the needle 26 inside the barrel 10 in order to force the lower needle tip 262 to prick through the plug 42 on the top of the cup 40. The blood from the vein of the patient will pass through the needle head 30, the guiding hole 222, the needle 26, and into the vacuum blood collecting cup 40. Since the needle head 30, the eccentric reduced portion 22 and reduced inlet 12 are all eccentrically disposed and close to the circumference of the barrel 10, a health care worker can prick the needle head 30 into the vein with a smaller inclined angle to the skin of the patient. Thus, the vaccuum syringe not only conforms to ergonomics, but prevents the needle head piercing through the blood vessels. Referring to FIG. 7, after the blood sampling is over, the press plate is pressed 21 backward to move the reduced lining tube back to prevent the needle head from pricking the health care workers. A stopping groove 142 is disposed at a proper position of the guiding slit 14, the width of the stopping groove 142 is larger than the width of the guiding slit 14 in order to stop the press plate 21 to moving forward or backward when the press plate 21 is moved to the stopping groove 142 to avoid the lower needle tip 262 at the lower end of the needle 26 to project out of the barrel 10 to cause danger. A plurality of bulging points 144 are disposed at the section of the guiding slit 14 below the stopping groove 142 to prevent the press plate 21 from slipping backward to drop out of the stopping groove 142 resulting in the lower needle tip being exposed from the barrel 10, as shown in FIG. 4 and 4A. Referring also to FIG. 8, a cannula needle can be located in the guiding hole 222 in advance when the eccentric reduced portion 22 of the reduced lining tube 20 is in production. Thus, there is no need to insert the needle separately, saving time and production cost. FIGS. 9-15 show further examples comprising a hollow barrel 50, a directional sliding trench 52 is transversely disposed at one side of the front end of the barrel 50, and a sliding slit 54 transversely disposed at another side opposite to the trench. A needle seat 60 and a press plate 70 are further disposed in the trench 52 and the slit 54 respectively. An eccentric reduced portion 62 is still disposed on the upper surface of the needle seat, and a needle head 30 may be wedged on the eccentric reduced portion 62. A guiding hole is pierced through the eccentric reduced port ion 62 so that a step shaped needle 64 comprising two night angles can be fixed therein and a lower needle tip 642 of the needle 64 can be placed at the central axial line of the reduced lining tube 50 firmly. A fixing seat 66 is disposed at the lower side of the needle seat 20 for receiving and fixing the needle 64 therein. Because the needle seat 60 can be fixed firmly in the trench 52, a positioning flange 61 is disposed around the outside profile of the needle seat 60, and a small flange 632 is attached to each flank side of a convex plate 63. A guiding groove 522 is disposed at each flank side of the trench corresponding to the position of the flange 632 so as to fix the flange therein to prevent the needle seat from dropping out of the trench. Moreover, in order to assemble the needle seat 60 easily into the trench 52, the trench 52 has a certain degree of angle between its two sides so that the width of the opening at the front edge is larger than the one of the end, enabling the needle seat 60 to easily slip into the trench 52. The press plate 70 has an end face 72 and a guiding stick 74, the guiding stick 74 has a triangle shape strip 742 at its flank side. The sliding slit 54 has a triangle shape slit opening 542 at its flank side corresponding to the position of the strip 742, so as to move the press plate 70 as a guide. A triangle shape inverted hook is formed at the end of the guiding stick 74 in order to be connected with the joint of the slit 54 and the trench 52 when the press plate 70 is positioned in the slit 54, enabling the press plate 70 not to slide backward to separate from the slit 54. An arc spring plate 722 is connected to the end of each flank side below the end face 72 to provide proper elastic force. A vacuum tube 40 is further disposed in the barrel 50, and an elastic plug 42 is firmly covered in the opening at the upper end of the vacuum tube 40, wherein the vacuum tube is available in the market. Next, referring to FIG. 13, when taking sample a blood, strike the needle head into the vein of a patient, then move the vacuum tube 40 toward the needle 64 inside the barrel 10 to allow the plug 42 of the cup 40 to be pierced. The blood from the vein of the patient will pass through the needle head 30, the guiding hole 622, to the needle 64, and into the vacuum blood collecting cup 40. When the blood sampling is over, the press plate 70 may be pushed to separate the needle seat 60 from the trench, and then to throw it in a needle head collector. Therefore, change the needle seat 60 and needle head for the next blood sampling to avoid the infection of virus. The advantage of the invention is that a proper thickness needle head 30 may be chosen to wedge on the eccentric reduced portion 22, 62, and the needle head can be a conventional needle head instead of using a particular one that needs a new mold to produce saving costs. Moreover, since a conventional vacuum blood collecting cup can still be used after the needle head 30 is eccentrically disposed, the needle 26, 64 of the invention is designed to be like a step comprising two right angle so as to position the lower needle tip 262, 642 of the needle 26, 64 at the center interior the barrel 10 and 50. Therefore, the lower needle tip 262, 642 can prick through the plug at the center, alleviating the need for vacuum blood collecting cup is unnecessary. It is to be understood that the drawing is designed for purpose of illustration only, and is not intended for use as a definition of the limits and scope of the invention disclosed.

Claims: A safety vacuum syringe for blood sampling conformed to ergonomics, mainly comprising a hollow barrel (10), a reduced lining tube (20) and a vacuum tube (40); the hollow barrel (10) having a reduced inlet (12) disposed on the top end thereof; the reduced lining tube (20) being installed in said hollow barrel (10); an eccentric reduced portion (22) being eccentrically disposed on the top end of said reduced lining tube (20) and having an opening (24) at the lower end thereof; said eccentric reduced portion (22) being wedged and fixed in said reduced lining tube (20); a through guiding hole (222) being disposed at the center of said eccentric reduced portion (22); said hollow barrel (10) comprising a guiding slit (14) disposed at the flank side thereof; a press plate (21) being connected to said reduced lining tube (20) at the outer flank side thereof and being positioned in said guiding slit (14), characterized in that : the eccentric reduced portion (22) projects out of the reduced inlet (12); a needle head (30) being fixedly covered on said eccentric reduced portion (22); a step shaped needle (26) comprising two right angles being positioned in said through guiding hole (222); a lower needle tip (262) of said needle step shaped (26) being positioned at the central axis in said reduced lining tube (20). The syringe of claim 1, wherein in order to install said lower needle tip at the center of said reduced lining tube, a fixing seat being disposed at the center inside said reduced lining tub for said needle to be fixed therein. The syringe of claim 1, wherein a hook-shaped flange (16) is disposed around inner wall of said barrel at a proper position so as to fix said reduce lining tube at the top end of said barrel and not to slip loosely downward. The syringe of claim 1, wherein a plurality of small slits (23) are disposed around lower side of said reduced lining tube, enabling the lower end of said reduced lining tube to keep proper elasticity. The syringe of claim 1, wherein a circular flange (224) is disposed around the eccentric reduced portion and a circular groove is disposed around the inner surface of said reduced inlet to accommodate and position said eccentric reduced portion in said reduced inlet. The syringe of claim 1, wherein a stopping groove (142) is disposed at a proper position of said guiding slit, the width of said stopping groove is larger than the width of said guiding slit. The syringe of claim 6, wherein a plurality of bulging points (144) are disposed at the section of the guiding slit below the stopping groove. A safety vacuum syringe for blood sampling conformed to ergonomics, mainly comprising a hollow barrel (10), a reduced lining tube (20) and a vacuum tube (40); the hollow barrel having a reduced inlet (12) disposed on the top end thereof; the reduced lining tube (20) being installed in said hollow barrel; an eccentric reduced portion (22) being eccentrically disposed on the top end of said reduced lining tube and having an opening (24) at the lower end thereof; said eccentric reduced portion being wedged and fixed in said reduced lining tube; a through guiding hole (222) being disposed at the center of said eccentric reduced portion (22); said hollow barrel (10) comprising a guiding slit (14) disposed at the flank side thereof; a press plate (21) being connected to said reduced lining tube (20) at the outer flank side thereof and being positioned in said guiding slit (14); characterized in that : the eccentric reduced portion (22) projects out of the reduced inlet (12); a needle cannula (25) being located in said through guiding hole (222); a step shaped needle (26) comprising two right angles being positioned in said through guiding hole (222); a lower needle tip (262) of said needle step shaped (26) being positioned at the central axis in said reduced lining tube (20).

Inventors: CHEN LONG-HSIUNG, CHEN, LONG-HSIUNG
Applicants: CHEN LONG-HSIUNG, CHEN, LONG-HSIUNG
Application year: 2001
Main classification: A61B5
IPC codes: A61B5