CN101244301A - Top triggering type non-needle unit head for injection - Google Patents

Abstract

The invention discloses a top-triggering, needle-free power unit for injection, comprising an elastic power resource part, a trigger apparatus and a safety device, wherein the elastic power resource part is composed of power unit body, an ejector, a momentum spring and an injector interface; the trigger apparatus is composed of an inner cylinder and a button; the safety device is composed of a spring plate, a sliding block, and two spheres. The needle-free power unit for injection has the advantages of simple structure, the adaptation of top-triggering, and arrangement of safety device; the power unit, with square cavity structure, has the advantages of simple and compact structure, small volume and good craftiness; the safety device can open automatically to prevent the injection from being triggered because of outside interference. The top-triggering, needle-free power unit for injection also has an advantage of automatic open under the indirect effect of the trigger before injection, having a safety protective effect.

Description

A kind of top triggering type non-needle unit head for injection

Technical field

The invention belongs to field of medical device technology, be specifically related to a kind of top triggering type non-needle unit head for injection.

Background technology

Needleless injection claims jet injection again, refer to the instantaneous pressure that utilizes machinery (as gases at high pressure or spring) to produce, promote medicament (liquid or lyophilized powder) through a very thin nozzle, form high-pressure spray, make medicinal liquid pass skin diffusion rapidly in tissue.This effusive very high speed, representative value is 120-300m/s, and it is limited to enter the degree of depth of human body, and is very little to the stimulation of teleneuron, and therefore tangible sensation of pricking is generally arranged unlike needle injection is arranged.The degree of depth that jet penetrates depends on many factors, such as aperture of skin and fat tissue thicknesses and injection pressure and spray-hole etc.

The origin of needleless injector can be traced back to 1566, and French scientist Galante has proposed Needleless injection thought the earliest, and has provided designing draft.1933, mechanical engineer Sutermeister and doctor Robert Hingson developed needleless injector the earliest jointly, and have carried out clinical research.Needleless injector once was used for the extensive prophylactic immunization of army during World War II, but syringe at that time must carry out filling and adjusting before each the use, and there is medicament aseptic in addition, problems such as production technology such as quantitative package are still unresolved, so product is at that time approved widely and paid attention to.

Since the eighties, along with the promotion of science and technology development and clinical needs, the research and development of needleless injector present rapid growth momentum.Because convenience, safe, painless, the characteristics of high efficiency of Needleless injection, this technology is day by day extensive in the application of clinical treatment and family health care.

At present typical needleless injector, its structure can be divided into three parts such as unit head, injection head, ampoule joint.Wherein, unit head comprises safety, flip flop equipment and three parts of power source, is the core of Needleless injection technology.Many organizations have developed different power head devices.Patent documentation WO9407554 discloses the power head device that flip flop equipment is positioned at the middle part, this device the operation on too not smoothly, (publication number is CN1382064 to Chinese patent literature " lockable mechanism of jet injector ", be 2002.11.27 in open day) power head device that a kind of flip flop equipment is positioned at the top, the structure more complicated of this device disclosed.

Summary of the invention

The object of the present invention is to provide a kind of top triggering type non-needle unit head for injection, this power head structure is simple, and good manufacturability is easy to use, safe.

Top triggering type non-needle unit head for injection provided by the invention, it comprises unit head body, thimble, power spring and syringe interface, it is characterized in that, it also comprises inner core, head, shell fragment, slide block and first, second spheroid;

The top of unit head body is a cavity, and the top has through hole; Inner tube installation is in the cavity of unit head bodies top, and head is connected with inner core by last through hole;

Be provided with square cavity in the middle part of unit head body, the top of square cavity is provided with first, second square set, is provided with inner via hole between first, second square set, and first, second square set and inner via hole constitute

The shape cavity structure, square cavity communicates by the cavity of inner via hole with the unit head bodies top; Have first, second through hole on first, second square set, the end that first, second through hole communicates with inner via hole is taper;

Two outsides of first, second square set are cavity, and these two cavitys communicate with the cavity of unit head bodies top, and the bottom of one of them cavity in two outsides of first, second square set has " " that links to each other with first or second through hole " the shape groove; Be inlaid with first, second spheroid in first, second through hole respectively;

Thimble is positioned at the body square cavity, and power spring is installed on the thimble, and thimble can be along the longitudinal movement; Shell fragment is fixed on " " " in the shape groove; Slide block is movably arranged on shell fragment and has " " " between the square set of shape groove;

Two opposite external side faces of the bottom of unit head body are taper surface, are provided with screwed hole in the bottom; The bottom of square cavity has the lower through-hole that communicates with screwed hole.

Above-mentioned unit head body, thimble, power spring and syringe interface constitute elastic energy source part; Inner core and head are formed flip flop equipment; Shell fragment, slide block and first, second spheroid constitute safety.Flip flop equipment is that trigger at the top, is made up of stressed less motion higher pair, uses less just can trigger needleless injector by bonding force.Safety can be automatically locked, and manually just can open, and prevent that syringe is subjected to external disturbance and trigger automatically; Manual operation safety slide, button trigger the back safety and open automatically, and the safeguard protection effect is played in injection subsequently.Adopt unit head provided by the present invention, the mode that user can trigger by the top produces instantaneous high pressure for its employed needleless injector provides power in needleless injector, make liquid state or powdery medicine transdermal, arrives subcutaneous layer of fat fast.Needleless injector has been compared many advantages with conventional syringe, the time do not have pain or have only that slight pain, subcutaneous injection do not injure tissue, drug diffusion is faster such as injection, and can not produce subcutaneous nodule, cross infection, simple to operate can not take place, do not need medical personnel's monitor patients to inject voluntarily anywhere, be particularly useful for syringe needle is had the patient and the child patient of fear, can significantly improve patient's compliance; Concerning medical personnel, needleless injector need not sterilize can use thereby convenient and swift and safely, the danger of having avoided syringe needle to infect; In addition, because needleless injector can be used continuously, greatly reduce trouble and expense that medical waste is handled.The scope of application of needleless injector is very wide, can be used for inoculating various vaccines, prevents and treats infectious disease, various Drug therapy and the crowds such as diabetics that need self-injection.Simultaneously, needleless injector still is hepatitis patient, acquired immune deficiency syndrome (AIDS) patient's a optimum selection.

Description of drawings

Figure 1 shows that a perspective view of the needleless injector power head that removes cover plate;

Figure 2 shows that the partial sectional view of the needleless injector power head that removes cover plate among Fig. 1;

Figure 3 shows that a partial sectional view of the unit head body among Fig. 2;

Figure 4 shows that first view according to an embodiment of the invention;

Figure 5 shows that first view of the unit head body among Fig. 4;

Figure 6 shows that first view of the mobile among Fig. 4.

The specific embodiment

The present invention is further detailed explanation below in conjunction with accompanying drawing and example.Description below, any reference that orientation or direction are done all mainly are for convenience rather than for scope of the present invention is limited to this.

According to the structure of needleless injector power head of the present invention as shown in Figure 1, in this was used, the end or the direction of nearly syringe head depended in term " far-end ".Term " near-end " is meant end or the direction near syringe interface.Term " vertically " is meant the direction parallel with the thimble axis, and term " laterally " is meant and vertical vertical substantially direction.

Non-needle unit head for injection of the present invention adopts the top to trigger, and comprises elastic energy source, flip flop equipment and three parts of safety.As shown in Figure 2, elastic energy source part comprises unit head body 1, thimble 2, power spring 3, syringe interface 10; Flip flop equipment is made up of inner core 8 and head 9; Safety comprise shell fragment 4, slide block 5 and first, second spheroid 6,7.

As shown in Figure 3, unit head body 1 is a square structure, and its top is a cavity, and the top has through hole 11a.Two opposite external side faces of the bottom of unit head body 1 are taper surface 11i, 11j, are provided with screwed hole 11l in the bottom.Be provided with square cavity 11h in the middle part of unit head body 1, the bottom of square cavity 11h communicates with screwed hole 11l by lower through-hole 11k.The top of square cavity 11h is provided with first, second square set 11c, 11d, is provided with inner via hole 11b between first, second square set 11c, the 11d, and first, second square set 11c, 11d and inner via hole 11b constitute

The shape cavity structure.Have first, second through hole 11e, 11f on first, second square set 11c, the 11d, one one of communicating with inner via hole 11b of first, second through hole 11e, 11f is taper, bellmouth can guarantee that spheroid can not roll out automatically on the one hand, guaranteed also that on the other hand spheroid and thimble centre contacts as much as possible, to reduce footprint pressure.Two outsides and the top of first, second square set 11c, 11d are cavity, each cavity communicates, the bottom of one of them cavity in two outsides of first, second square set 11c, 11d has " " that links to each other with the first or second through hole 11e, 11f " shape groove 11g, square cavity 11h communicates with the cavity of first, second square set 11c, 11d top by inner via hole 11b.

Thimble 2 is positioned at body 1 square cavity 11h, and power spring 3 is installed on the thimble 2, and thimble 2 can be along the longitudinal movement; Shell fragment 4 is fixed on " " " in the shape groove 11g; Slide block 5 is installed between shell fragment 4 and the first or second square set 11c, the 11d, can be along the longitudinal movement; Be inlaid with first, second spheroid 6,7 in first, second through hole 11e, the 11f respectively, can be along laterally moving; Inner core 8 is installed in the cavity at unit head body 1 top, and inner core 8 and head 9 are connected one by last through hole 11a, can be along the longitudinal movement in the cavity in the cavity at unit head body 1 top and first, second square set 11c, the 11d outside.

Before the injection, thimble 2 is positioned at the most proximal end of body 1, shown in Fig. 2 dotted line; Inner core 8, head 9 are positioned at the most proximal end of its movement position, and shell fragment 4 outwards ejects under inner core 8 effects; Slide block 5 is positioned at the most proximal end of its movement position.Under the string holder effect, thimble 2 is to distal movement, and spring 3 is compressed, inner core 8, head 9 are together to distal movement, and up to the distal-most end of its movement position, shell fragment 4 recovers its naturalness, the upper end of shell fragment 4 heads on the lower end of inner core 8, and inner core 8 is had thrust upwards, plays safety effect; Remove string holder, spring 3 recovers, and thimble 2 is to the near-end motion, and up to touching spheroid 6,7, spheroid 6,7 is subjected to the active force of thimble 2 and inner core 8 simultaneously, and system reaches the stress balance state, and as shown in Figure 2, the process of winding up finishes.Injection preparation finishes, and with the be along the longitudinal movement distal-most end of its movement position of slide block 5, shell fragment 4 is under slide block 5 extrapolability effects, along laterally outwards ejecting, to the last thrust disappearance of inner core 8; Under the effect of button power, inner core 8, head 9 move to near-end together, when the thrust of 8 pairs of spheroids of inner core 6,7 finishes, pulling force because of spring 3, thimble 2 promotes spheroid 6,7 and moves along laterally surveying toward two, and at this moment, thimble 2 is under the effect of spring 3, longitudinally move to dotted line position shown in Figure 1, finish shot process toward near-end.

As shown in Figure 4, as according to one embodiment of present invention.Make the part of the bottom of above-mentioned unit head body 1 dismountable, power spring 3 is installed on the thimble 2, be installed in the housing 12, adopt little gap bonding mode to be installed in the square cavity of unit head body 1 housing 12 again, housing 12 tops are with rubber case 13, play the fixedly effect of mobile.Have the through hole that links to each other with inner via hole 11b on the rubber case 13, housing 12 bottoms have the through hole that links to each other with lower through-hole 11k.

As shown in Figure 5, housing 12 is fixed in the cavity of unit head body 1 by little gap bonding mode.Its concrete structure is: as shown in Figure 6, be provided with square protrudingly 15 in housing 12 outer upper, have groove 14 at the correspondence position of injection head body 1, square protruding 15 with the groove 14 little gap bondings of injection head body.

Inject medicinal liquid of different nature and different dosage, need different injection pressures, the power spring of corresponding selection different model, the existence of mobile makes simple that the process of changing spring becomes.

Although embodiments of the invention disclosed herein obviously can be realized above-mentioned purpose fully, will be appreciated that also those skilled in the art can design numerous variations situation and different embodiment.Therefore, be understood that protection scope of the present invention should cover all these changes and embodiment.

Claims (2)

1, a kind of top triggering type non-needle unit head for injection, comprise unit head body (1), thimble (2), power spring (3) and syringe interface (10), it is characterized in that: it also comprises inner core (8), head (9), shell fragment (4), slide block (5) and first, second spheroid (6,7);

The top of unit head body (1) is a cavity, and the top has through hole (11a); Inner core (8) is installed in the cavity at unit head body (1) top, and head (9) is connected with inner core (8) by last through hole (11a);

Be provided with square cavity (11h) in the middle part of unit head body (1), the top of square cavity (11h) is provided with first, second square set (11c, 11d), be provided with inner via hole (11b) between first, second square set (11c, 11d), first, second square set (11c, 11d) and inner via hole (11b) constitute

The shape cavity structure, square cavity (11h) communicates by the cavity of inner via hole (11b) with unit head body (1) top; Have first, second through hole (11e, 11f) on first, second square set (11c, 11d), the end that first, second through hole (11e, 11f) communicates with inner via hole (11b) is taper;

Two outsides of first, second square set (11c, 11d) are cavity, these two cavitys communicate with the cavity at unit head body (1) top, and the bottom of one of them cavity in two outsides of first, second square set (11c, 11d) has " " that links to each other with first or second through hole (11e, 11f) " shape groove (11g); Be inlaid with first, second spheroid (6,7) in first, second through hole (11e, 11f) respectively;

Thimble (2) is positioned at body (1) square cavity (11h), and power spring (3) is installed on the thimble (2), and thimble (2) can be along the longitudinal movement; Shell fragment (4) is fixed on " " " in the shape groove (11g); Slide block (5) is movably arranged on shell fragment (4) and has " " " between the square set of shape groove (11g);

Two opposite external side faces of the bottom of unit head body (1) are taper surface (11i, 11j), are provided with screwed hole (11l) in the bottom; The bottom of square cavity (11h) has the lower through-hole (11k) that communicates with screwed hole (11l).

2, top triggering type non-needle unit head for injection according to claim 1, it is characterized in that: the part of the bottom of unit head body (1) is dismountable, power spring (3) is installed in the housing (12) with thimble (2), housing (12) adopts little gap bonding mode to be installed in the square cavity of unit head body (1), and housing (12) top is with rubber case (13); Have the through hole that links to each other with inner via hole (11b) on the rubber case (13), housing (12) bottom has the through hole that links to each other with lower through-hole (11k).

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