CN109316195B

CN109316195B - Safety hemostix

Info

Publication number: CN109316195B
Application number: CN201710946855.7A
Authority: CN
Inventors: 胡宏; 凌亮文
Original assignee: Jiangxi Fenglin Medical Appliance Co ltd; Aci Medical Pte Ltd
Current assignee: Jiangxi Fenglin Medical Appliance Co ltd; Aci Medical Pte Ltd
Priority date: 2017-10-12
Filing date: 2017-10-12
Publication date: 2021-08-03
Anticipated expiration: 2037-10-12
Also published as: CN109316195A

Abstract

A safe blood collector, comprising: a needle tube with a cantilever gripper arranged on the needle tube seat; a housing including a proximal end for insertion into a vacuum tube, a distal end including a retention step that fits with the catch to keep the distal end of the needle cannula extending beyond the housing before and during blood collection, and a resilient control tab that disengages the catch from the retention step when the resilient control tab is compressed; a compression spring disposed between the distal end of the housing and the needle hub in a compressed state prior to and during blood collection to spring the needle hub into the housing when the catch is disengaged from the step; and a safety cap surrounding the needle cannula extending beyond the distal end of the housing prior to use, the proximal end of the safety cap being fitted with the free end of the resilient control tab to prevent compression of the resilient control tab prior to use.

Description

Safety hemostix

Technical Field

The invention relates to a safe hemostix.

Background

Blood sampling is a frequently performed procedure for obtaining a patient's blood sample in an experimental test. To facilitate blood collection and minimize contamination, safety blood collectors are used in conjunction with multiple vacuum tubes to directly collect and store blood in the vacuum tubes. In one example of a safety blood sampler, the safety blood sampler includes a needle cannula (hollow needle) having a proximal end for piercing a vacuum cap and a distal end for drawing blood by piercing a vein of a patient. The safety hemostix further includes a housing supporting the needle cannula during blood collection and a vacuum tube. After blood is collected in the first vacuum tube, the first vacuum tube is withdrawn from the housing. If desired, a second vacuum tube may be inserted into the housing to again collect blood into the second vacuum tube. In this way, blood collection from multiple evacuated tubes can be obtained from one patient. After blood is drawn from the patient and the needle cannula is withdrawn from the patient, a retraction mechanism may be activated to retract the needle cannula into the housing to prevent needle stick injury.

There is a need to provide a safe blood collection set that prevents or eliminates accidental removal of the needle cannula from the patient when the vacuum tube is removed from the blood collection set. It is also desirable to provide a safety hemostix that avoids accidental retraction of the needle cannula into the housing prior to use of the safety hemostix.

Disclosure of Invention

One aspect of the present invention provides a safe blood collector, which includes: a needle cannula having a proximal end for penetrating the vacuum cap and a distal end for penetrating a patient's venous blood vessel, the needle cannula mounted on a needle cannula hub, the needle cannula hub including a proximally facing cantilevered gripper; a housing comprising an open proximal end for insertion of an evacuated tube into the housing pierced by the proximal end of the needle cannula, a distal end comprising a distally facing retention step, wherein the retention step is assembled with the cantilever catch before and during blood collection to maintain the distal end of the needle cannula telescoped out of the distal end of the housing before and during blood collection, and a resilient control tab for pressing and moving toward a central axis of the housing, oriented distally to the cantilever catch, wherein the cantilever catch is disengaged from the retention step upon pressing the resilient control tab; a compression spring disposed in a compressed state between the distal end of the housing and the needle hub prior to and during blood collection, the compression spring connecting the needle hub proximally into the housing, wherein the needle hub contracts into the housing under the force of the compression spring when the cantilever catch is disengaged from the step by pressing the resilient control tab; and a safety cap disposed at the distal end of the housing and covering the distal end of the needle cannula, the distal end of the needle cannula extending beyond the distal end of the housing before use of the safety blood collection device, wherein the proximal end of the safety cap is assembled with the free end of the elastic control piece before use of the safety blood collection device to prevent the elastic control piece from being pressed.

The housing further includes an axial groove on an inner surface of the housing, a sliding contact end slidably engaging each hub arm detent of each axial groove, each axial groove including a stop configured to engage a free end of each hub arm detent, each stop disposed at a distance from a distal end of the housing to completely enclose the needle cannula within the housing while preventing proximal movement of the needle cannula under pressure of the compression spring when the needle cannula is retracted and the sliding contact end of each needle hub is engaged by each stop, and wherein each stop is disposed in each axial groove without protruding from the inner surface of the housing toward a central axis of the housing.

The housing includes an opening at a distal end of the housing to allow the spring control tab to contact the cantilevered gripper therethrough.

The spring control tab may include a projecting bar acting on the inner surface of the spring control tab on the cantilevered gripper.

The proximal end of the safety cap may be provided with a radial flange to engage the free end of the resilient control tab.

The stops are each flush with an inner surface of the housing.

Another aspect of the present invention provides a safe blood collector, which includes: a needle cannula having a proximal end for penetrating the vacuum cap and a distal end for penetrating a patient's venous blood vessel, the needle cannula being mounted on a needle cannula mount, the needle cannula mount including a proximally facing cantilever gripper and a number of proximally projecting needle mount arm grippers; a housing comprising an open proximal end for insertion of an evacuated tube into the housing to be pierced by the proximal end of the needle cannula, a distal end comprising a distally facing retention step, wherein the retention step is assembled with the cantilever catch before and during blood collection to maintain the distal end of the needle cannula telescoped out of the distal end of the housing before and during blood collection, and a distally facing resilient control tab configured to press and move the cantilever catch towards the central axis of the housing, wherein the cantilever catch is disengaged from the retention step upon pressing the resilient control tab; and a compression spring disposed between the distal end of the housing and the needle hub in a compressed state between and during blood collection, the compression spring connecting the needle hub proximally into the housing, wherein the needle hub contracts into the housing under the force of the compression spring when the cantilever catch is disengaged from the step by pressing the resilient control tab; wherein the housing may further comprise axial grooves on an inner surface of the housing, each of the axial grooves being slidably assembled with the sliding contact end of each of the hub arms, a stopper configured to block the sliding contact end of each of the hub arms from sliding within each of the axial grooves, the stopper being provided at a distance from the distal end of the housing to completely enclose the needle cannula within the housing, while the sliding contact end of each of the hub arms is blocked by each of the stoppers after contraction of the needle cannula to prevent the needle cannula from moving proximally under the elastic force of the compression spring, and wherein each of the stoppers is provided in each of the axial grooves without protruding from the inner surface of the housing. The stop may be flush with the inner surface of the housing.

Drawings

In order that the present invention may be more fully understood and readily put into practical effect, there shall now be described by way of non-limitative example only exemplary embodiments of the present invention, the description being with reference to the accompanying illustrative drawings.

Fig. 1 is a perspective exploded assembly view of an exemplary safety blood collector.

Fig. 2 is a schematic sectional structure view of the safety blood collector before use.

Fig. 3 is a perspective view of a safety hemostix ready for use in collecting blood (vacuum tube not shown).

FIG. 4 is a rear end view of the needle hub of the housing of the assembled safety hemostix.

FIG. 5 is a schematic cross-sectional view of the spring control tab and cantilever gripper mechanism of the safety hemostix for needle retraction after blood collection and before use.

Fig. 6 is a perspective view of the safety blood collection device before use.

Fig. 7 is a schematic sectional view of the safety blood collector after the needle tube is retracted.

Fig. 8 is a perspective view of the safety blood collector after the needle tube is retracted.

FIG. 9 is a cross-sectional view of the housing stop member positioning the syringe after retraction.

Detailed Description

An exemplary embodiment of the safety blood collector 10 will be described below with reference to fig. 1 to 9, in which like reference numerals are used to designate like parts.

As shown in fig. 1 to 3, the safety blood collector 10 includes a needle tube (hollow needle) 20, and a cylindrical housing 30 for holding the needle tube 20 during blood collection. As described below, the housing 30 may retract the needle cannula 20 after blood collection is complete and store the needle cannula 20 within the housing 30.

The proximal end 21 of the needle cannula 20 is used to pierce a vacuum cap (not shown) and the distal end 22 is used to pierce a patient's vein. A sheath 23 made of a resilient sealing material such as latex, silicone or flexible plastic surrounds the distal end 22 of the needle cannula 20. As the vacuum tube is advanced toward the sheath 23, the proximal end 21 of the needle cannula will penetrate the sheath 23 and vacuum cap and pass through the vacuum cap with the needle cannula 20. The shield 23 prevents blood in the syringe 20 from flowing into the housing 30 when the vacuum tube is removed from the syringe 20.

The vacuum tube is inserted into the housing 30 from the proximal end 31 of the housing 30. Distal end 32 of housing 30 extends distally out of cylindrical tube 38 with a truncated cone 35. The distal end 32 of the housing is matingly fitted with the needle cannula 20 prior to and during blood collection.

The needle cannula 20 is mounted on the needle hub 40. The needle hub 40 is at a substantially central location along the length of the needle cannula 20 and is fitted to the needle cannula 20 via a substantially cylindrical needle clip 41 surrounding the needle cannula 20. The sheath 23 fits over a cylindrical needle clip 41 at the proximal end 21 of the needle cannula 20. The needle hub 40 includes hub arms 42 that are connected to a cylindrical needle clip 41. As shown in fig. 1 to 4 and 7 to 9, the needle holder arm claws 42 are evenly distributed on the cylindrical needle holder 41 and project outward. The sliding contact end 43 of each hub arm jaw 42 is slidably mounted in an axial groove 33 in the inner surface 37 of the housing 30 so that the needle cannula 20 is always concentric with the housing 30.

As shown in fig. 1 to 3, the cylindrical needle clip 41 of the needle hub 40 is partially fitted in the cylindrical tube 38 of the housing 30 before and during blood collection, so that the distal end 22 of the needle cannula 20 protrudes out of the distal end 32 of the housing 30 before and during blood collection. As shown in fig. 1,2 and 6, safety hemostix 10 further includes a safety cap 60 that fits over distal end 32 of housing 30 and encloses the extended needle cannula 20 prior to use of safety hemostix 10. The proximal end 61 of the safety cap 60 fits over the cylindrical tube 38 at the distal end 32 of the housing 30 with a friction fit.

As shown in fig. 2 and 3, safety hemostix 10 further includes a compression spring 80 disposed between distal end 32 of housing 30 and needle hub 40 in a compressed state before and during blood collection. As described below, the compression spring 80 is fitted over the cylindrical needle holder 41 in the cylindrical tube 38 and pushes the needle holder 40 into the housing 30, so that the needle cannula 20 is retracted into the housing 30 after blood collection.

To prevent proximal retraction of the needle cannula 20 and needle hub 40 into the housing 30 prior to and during blood collection, the needle hub 40 is provided with a proximally directed cantilevered catch 44 and a distally facing retention step 54 (shown in fig. 2 and 5) at the truncated cone 35 of the housing 30. The cantilever catch 44 matingly fits with the retention step 54 to prevent proximal movement of the needle cannula 20 and needle hub 40 prior to and during blood collection such that the distal end 22 of the needle cannula 20 is in a condition extending beyond the distal end 32 of the housing 30 prior to and during blood collection.

As shown in fig. 1,2,5,6 and 7, the housing 30 also includes an opening 50 through which the cantilevered catch 44 on the needle hub 40 is accessible 50. An opening 50 is provided at the distal end 32 of the housing 30 via the truncated cone 35. The retention step 54 is preferably located at the proximal edge of the opening 50. Housing 30 also includes a distally directed resilient control tab 55. The spring control tab 55 is preferably cantilevered from the proximal edge of the opening 50 toward the cylindrical tube 38 at the distal end 32 of the housing 30. The elastic control flap 55 extends over the opening 50. The elastic control piece 55 is pressed into the housing 30 by the user toward the central axis L of the safety hemostix 10 to deform and displace the cantilever catch 44 on the needle holder 40 toward the central axis L of the housing 30 into the housing 30. Sufficient deforming displacement of the cantilever fingers 44 causes the cantilever fingers 44 to disengage from the retention steps 54 of the housing 30 so that the needle hub 40 and needle cannula 20 move proximally into the housing 30 under the force of the compression spring 80 (as shown in fig. 7 and 8). In this manner, the needle cannula 20 may be retracted into the housing 20 after blood collection by the user simply depressing the resilient control tab 55 of the housing 30, thereby disengaging the cantilevered catch 44 from the retention step 54. The spring control tab 55 is provided on its inner surface (as shown in fig. 5,6 and 7) with a projecting bar 58 which functions to produce a deforming displacement of the cantilever catch 44 when the spring control tab 55 is depressed.

As shown in fig. 2,5 and 6, to prevent accidental compression prior to use of safety lancet 10 (which may accidentally retract cantilever catch 44 and needle cannula 20 into housing 30 prior to use, rendering the safety lancet unusable), free end 56 of resilient control tab 55 is designed to fit with proximal end 61 of safety cap 60 prior to use of safety lancet 10. The proximal end 61 of the safety cap 60 is flanged to fit over the free end 56 of the resilient control tab 55. In this manner, proximal end 61 of safety cap 60 prevents resilient control tab 55 from being pressed into opening 50 while safety cap 60 is on needle cannula 20, thereby preventing retraction of needle cannula 20 during storage and handling of safety cartridge 10 due to inadvertent compression of resilient control tab 55. As shown in FIGS. 3,7 and 8, during use of safety device 10, resilient control tab 55 is pressed into opening 50 only by removing safety cap 60, and then cantilever gripper 44 and needle cannula 20 are retracted.

As shown in fig. 2,7 and 8, a stop 34 is provided in the axial recess 33 in sliding engagement with the sliding contact end 43 of each hub arm jaw 42 and is positioned a distance from the distal tip 36 of the housing 30 for retraction of the needle cannula 20 and needle hub 40 into the housing 30. Each stopper 34 designed in the axial groove 33 is contactable with the sliding contact end 43 on the needle holder arm claw 42 to prevent the needle holder 40 from moving proximally under the elastic force of the compression spring 80. As shown in fig. 7 and 8, when the needle cannula 20 is retracted within the housing 30, there is sufficient distance between the stopper 34 and the distal tip 36 of the housing 30 to ensure that the needle cannula 20 is fully enclosed within the housing 30.

The respective stoppers 34 are designed in the respective axial grooves 33, instead of protruding from the inner surface 37 of the housing 30 toward the central axis L of the housing 30, so that the inner surface 37 of the housing 30 does not have any protruding structure. For example, as shown in the close-up view of fig. 9, each stop 34 may be flush with the inner surface 37 of the housing 30. Protruding structures on the inner surface of the housing may accidentally come into contact with the evacuated tube during the extraction of the evacuated tube from the housing in the proximal direction, causing the housing and the needle cannula connected to the housing to be accidentally pulled away from the patient, resulting in the needle cannula being accidentally extracted. In order to again take a blood sample in such a situation, the venipuncture would need to be re-performed on the patient, causing unnecessary additional discomfort to the patient. By ensuring that there are no protruding structures on the inner surface 37 of the housing 30, while designing the stopper 34 in the axial groove 33 so that the needle cannula 20 and the needle hub 40 after retraction are positioned in the housing 30, accidental withdrawal of the needle cannula 20 from the patient during withdrawal of the evacuated tube from the housing 30 is minimized, thereby minimizing patient discomfort, while allowing the used needle cannula 20 to retract to avoid needle stick injuries.

While the foregoing exemplary embodiments of the invention have been described, it will be understood by those skilled in the technology concerned that many variations in details of design, construction and/or operation may be made without departing from the present invention. For example, in a simpler alternative embodiment, the safety hemostix may be designed with the free end of the proximal resilient control tab fitted with a safety cap, but without a stop in the axial groove. Alternatively, the safety hemostix may be designed with the stopper in the axial groove, but not with the proximal elastic control tab free end fitted with a safety cap.

Claims

1. A safe blood collector, comprising:

a needle cannula having a proximal end for penetrating the vacuum cap and a distal end for penetrating a patient's venous blood vessel, the needle cannula disposed on a needle hub, the needle hub including a proximally directed cantilevered gripper;

a housing, comprising:

an open proximal end for insertion of an evacuated tube into the housing pierced by the proximal end of the needle cannula,

a distal end comprising a distally facing retention step, wherein the retention step is assembled with the cantilever catch prior to and during blood collection to maintain the distal end of the needle cannula extending beyond the distal end of the housing prior to and during blood collection, and

a resilient control tab oriented distally to a cantilevered gripper for pressing and moving toward a central axis of the housing, wherein the cantilevered gripper disengages the retention step when the resilient control tab is pressed;

a compression spring disposed in a compressed state between the distal end of the housing and the needle hub before and during blood collection, the compression spring bringing the needle hub proximally into the housing, wherein the cantilever catch contracts into the housing under the force of the compression spring when disengaged from the step by depressing the resilient control tab; and

a safety cap disposed at the distal end of the housing and surrounding the distal end of the needle cannula extending beyond the distal end of the housing prior to use of the safety hemostix, wherein the proximal end of the safety cap is assembled with the free end of the elastic control tab prior to use of the safety hemostix to prevent depression of the elastic control tab;

2. A safety lancing device according to claim 1, wherein the housing includes an opening at a distal end of the housing to allow the resilient control tab and the cantilevered gripper to pass in contact therebetween.

3. A safety hemostix according to claim 1 or claim 2, wherein the resilient control tab comprises a raised bar acting on an inner surface of the resilient control tab on the cantilevered gripper.

4. A safety lancing device according to claim 1, wherein the proximal end of the safety cap is provided with a radial flange to engage the free end of the resilient control tab.

5. A safe lancing device according to claim 1, wherein the stops are each flush with the inner surface of the housing.

6. A safe blood collector, comprising:

a needle cannula having a proximal end for penetrating the vacuum cap and a distal end for penetrating a vein of a patient, the needle cannula being disposed on a needle hub including a proximally facing cantilevered gripper and a number of proximally projecting needle hub arms;

a housing, comprising:

an open proximal end for insertion of an evacuated tube into the housing and penetration by the proximal end of the needle cannula,

a resilient control tab for pressing and moving the cantilevered gripper toward a central axis of the housing, wherein the cantilevered gripper disengages the retention step when the resilient control tab is pressed; and

a compression spring disposed in a compressed state between the distal end of the housing and the needle hub before and during blood collection, the compression spring bringing the needle hub proximally into the housing, wherein the cantilever catch contracts into the housing under the pressure of the compression spring when disengaged from the step by depressing the resilient control tab;

wherein the housing further comprises axial grooves on an inner surface of the housing, sliding contact ends of each needle hub slidably engaging each of the axial grooves, each axial groove comprising a stop configured to engage the sliding contact end of each needle hub arm claw, each stop disposed at a distance from the distal end of the housing to fully enclose the needle cannula within the housing while preventing proximal movement of the needle hub under pressure of the compression spring when the needle cannula is retracted and the sliding contact ends of each needle hub are engaged by each stop, and wherein each stop is disposed in each axial groove without protruding from the inner surface of the housing toward a central axis of the housing.

7. A safe lancing device according to claim 6, wherein each stop is flush with the inner surface of the housing.