CN2235789Y

CN2235789Y - Puncture trocar

Info

Publication number: CN2235789Y
Application number: CN 95224010
Authority: CN
Inventors: 骆仁华
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-10-18
Filing date: 1995-10-18
Publication date: 1996-09-25
Anticipated expiration: 2005-10-18

Abstract

The utility model relates to a puncturing trocar which is composed of a first needle tube, a second needle tube and a third needle tube, wherein the second needle tube and the third needle tube are respectively arranged in the first needle tube and the second needle tube in a slide mode, and each needle tube with smaller tube diameter is longer than the needle tube with larger tube diameter. When the utility model is used, the three needle tubes are sheathed together, and the inclined cuts of the three needle tubes are positioned in the same level. When the utility model is inserted in the outer surface of the part to be inserted, only the thinner second needle tube and the third needle tube are inserted in the part to be inserted, and the third needle tube is withdrawn, and is connected with a hollow needle barrel for extracting samples. The puncturing trocar has the advantage of safe sampling.

Description

Paracentesis trocar

This utility model relates to veterinary medical instrument, particularly the used paracentesis trocar of amniotomy.

The used puncture needle tubing of general amniotomy is shown in accompanying drawing 5 and 6.Utilize this puncture needle tubing 1 through abdominal part cortex 21 and myometrium 22, enter in the amniotic cavity 23 and extract amniotic fluid.Should form by the outer tube 11 of a hollow and 12 of interior pipes that are placed in the outer tube 11 by puncture needle tubing 1 commonly used.

Use the external diameter of the thinnest outer tube 11 to be about 0.8 millimeter at present clinically, make thinner needle tubing 11 certainly and can reach technically, but when puncturing operation, the crooked or accident that fractures as shown in Figure 5 can take place, this is breakneck.Thick hollow outer tube 11 helps puncturing, but big to thin thin amniotic membrane injury, and therefore, the abortion ratio of the sheep of process amniocentesis postoperative maintains about 0.5% always, and can't reduce again.Tracing it to its cause is that very thin amniotic membrane can't heal because the aperture that is punctured is too big with after this caliber puncture, and therefore, the amniotic fluid overflow is the main cause of miscarriage that amniotomy causes.Therefore, how reducing the puncture aperture is a problem that urgency is to be solved.

Because the shortcoming of prior art Puncture needle sleeve through designer's research and experiment, is designed this utility model paracentesis trocar that can reduce the puncture aperture finally.

The purpose of this utility model is: a kind of puncture needle tubing is provided, this puncture needle tubing intensity big and in piercing process needle body not flexible or fracture, simultaneously, also can not stay the large aperture of crossing after the puncture to sampling, it is dangerous to reduce puncture.

Another purpose of the present utility model is: a kind of puncture needle tubing is provided, and this puncture needle tubing can prevent that the phenomenon that needle tubing gets clogged from taking place, and is convenient to extract simultaneously required fluid again.

The purpose of this utility model is achieved in that provides a kind of paracentesis trocar, described trocar by first needle tubing, second needle tubing and the 3rd needle tubing totally three needle tubings formed; Described first needle tubing is a hollow tube, and its lower end has angular cut, and the upper end is provided with first engagement device, has the through hole that is connected with hollow tube in described first engagement device; Described second needle tubing also is a hollow tube, be placed in slidably among first needle tubing, its lower end has angular cut, the upper end is provided with second engagement device, has the through hole that is connected with hollow tube in described second engagement device, its engagement device of second pin that is installed in first needle tubing partly is exposed to outside first engagement device, and stretch out outside the first needle tubing angular cut lower end of its angular cut; Described the 3rd needle tubing can be a hollow tube, also real needle body to the greatest extent, its lower end has angular cut, the upper end has the 3rd engagement device, be placed in slidably among second needle tubing, its engagement device of the 3rd needle tubing that is installed in second needle tubing partly is exposed to outside second engagement device, and stretch out outside the second needle tubing angular cut lower end of its angular cut.When puncturing with the trocar that makes up, first needle tubing rests on outside the amniotic membrane, and only enters in the amniotic cavity with second needle tubing and the 3rd needle tubing, thereby reduces the aperture of puncture wound.Thereby the purpose of this utility model has just reached fully.

The present invention has good result.

1, safety: because thinner inner needle tube is subjected to thick and the protection outer needle tubing that intensity is high; so it is not flexible or fracture; this utility model second needle tubing bore is 0.4 millimeter, dwindles approximately half so enter the about 0.8 millimeter person of the present prior art of the aperture ratio of amniotic membrane the thinnest used bore.

2, easily see under the ultrasound: because trocar sheath is thicker than prior art person, thus reflective stronger when using, be easy to debate the knowledge needle position behind the inserting needle;

3, multi-functional: as selectively to use outer needle tubing directly or indirectly to enter amniotic cavity.

4, the internal and external pin caliber can cooperate arbitrarily: pin all can be fixed in second needle tubing under the principle of fixed point and can cooperate as required with bore between first needle tubing in extracting out.

5, the interior pipe that protrudes is arranged: manage all than the pipe range outside it in each, thereby keep caliber unimpeded.

Below in conjunction with drawings and Examples this utility model is elaborated.

Accompanying drawing 1 is this utility model sketch map before the trocar combination of threading a needle;

Accompanying drawing 2 is this utility model trocar combination back sketch map of threading a needle;

Accompanying drawing 3 is this utility model sketch map of trocar before desiring to puncture of threading a needle;

Accompanying drawing 4 passes sketch map behind the skin flesh layer for this utility model trocar of threading a needle;

Accompanying drawing 5 is the preceding sketch map of prior art paracentesis trocar combination;

Accompanying drawing 5 passes the sketch map of skin flesh layer for the prior art paracentesis trocar;

Accompanying drawing 5 and accompanying drawing 6 had been narrated at leading portion.As follows at accompanying drawing 1 corresponding relation of each parts and its label to the accompanying drawing 4:

3-puncture needle tubing, 33-first needle tubing, 32-second needle tubing, 31-the 3rd needle tubing, the 33b-first needle tubing angular cut, 33a-first engagement device, the 33c-first engagement device breach, the 33d-first engagement device through hole, the 32b-second needle tubing angular cut, 32a-second engagement device, 31b the 3rd needle tubing angular cut, 31a-the 3rd engagement device, the short Radix Crotalariae szemoensis of 31c-the 3rd engagement device, the 32e-second engagement device through hole.

As attached Fig. 1 and 2, this utility model paracentesis trocar 3 by first needle tubing 33, second needle tubing 32 and the 3rd needle tubing 31 totally three kinds of needle tubings formed, wherein, described first needle tubing 33 is a hollow tube, its lower end has angular cut 33b, the upper end is provided with the first engagement device 33a, has the through hole 33d that is connected with hollow tube in described first engagement device, through hole 33d edge at this first engagement device 33a is provided with the screw thread (not shown), so that engage the empty needle tube, on the edge of first engagement device, have breach 33c; Described second needle tubing 32 also is a hollow tube, be placed in slidably among first needle tubing 33, its lower end has angular cut 32b, the upper end is provided with the second engagement device 32a, has the through hole 32e that is connected with hollow tube in second engagement device, second needle tubing, 32 its engagement devices that are installed in first needle tubing 33 partly are exposed to outside the first engagement device 33a, and stretch out outside first needle tubing, the 33 angular cut 33b lower end of its angular cut, there is the screw thread (not shown) at through hole 32e edge in this second engagement device 32a so that engage the tube of threading a needle, on the edge of this second engagement device 32a, has breach 32c, on second engagement device, be provided with short Radix Crotalariae szemoensis 32d, when combination, these weak point Radix Crotalariae szemoensis can be sticked among the breach 33c of first pin short 33, the second engagement device 32a partly is placed in the first engagement device 33a, and makes the angular cut 33b of first needle tubing 33 after the combination consistent with the direction of the angular cut 32b of second needle tubing 32; Described the 3rd needle tubing 31 is solid needle body in the present embodiment, shown in attached Fig. 1 and 2, its lower end has angular cut 31b, the upper end has the 3rd engagement device 31a, be placed in slidably in second needle tubing 32, on the 3rd engagement device 31a, be provided with short Radix Crotalariae szemoensis 31c, the 3rd needle tubing 31 its 3rd engagement device 31a that are installed in second needle tubing 32 partly are exposed to outside the second needle tubing 32a, and stretch out outside second needle tubing, the 32 angular cut 32b lower end of its angular cut, on the 3rd engagement device, be provided with short Radix Crotalariae szemoensis 31c, when combination, this weak point Radix Crotalariae szemoensis 31c can be sticked among the breach 32c of the 3rd needle tubing 32, makes the angular cut 32b of second needle tubing 32 after the combination consistent with the direction of the angular cut 31b of the 3rd needle tubing 31.

This utility model is not limited to three mutual sockets of needle tubing, and the personnel that know this technology also can be incorporated in this utility model technology the mutual fit of needle tubing more than three.

The using method of this paracentesis trocar is described with amniocentesis now, and industry technical staff should know that this utility model is not limited to amniocentesis certainly, also can be applicable to other position of human body or other animal.From accompanying drawing 3 and 4 as can be known, operating sequence is as follows:

1, determines earlier the number of amniotic fluid films in embryo 24 the position of early stage conceived sheep and the assessment amniotic cavity 23 with ultrasound wave;

2, to estimate that the pin place is the center down, clearly skin of abdomen is sterilized with iodine tincture and wine; Ultrasound wave behaviour head is immersed among the Ce Fulin (zephrine) after 30 minutes, with normal saline solution flushing probe, reuse iodine tincture and alcohol wipe;

3, be fixed on the ultrasound probe with the needle holder (not shown), then paracentesis trocar 3 is fixed on the needle holder, before inserting, second needle tubing 32 and the 3rd needle tubing 31 are not upwards mentioned, angular cut 33b, 32b, the 32b of each needle tubing are flushed, as accompanying drawing 3 51 shown in such;

4, involve under the needle holder guiding ultrasonic, make paracentesis trocar 3 enter sheep abdominal part flesh layer 21 and myometrium 22, when the trocar syringe needle arrives at myometrium 22 bottoms, press second needle tubing 32 and the 3rd needle tubing 31 that once was enhanced with light finger, make first needle tubing 33 stay in myometrium 22 bottoms, and second needle tubing 32 and the 3rd needle tubing 31 are entered in the amniotic cavity 23, because second needle tubing is little than first needle tubing, therefore, it enters can make in the amniotic membrane 23 reduces to minimum to the injury of amniotic cavity wall, and because first needle tubing 33 must not enter in the amniotic cavity 23, therefore its caliber and wall thickness can be done more greatly, thereby avoid trocar to bend or fracture in piercing process, and second needle tubing 32 and the 3rd needle tubing 31 be owing to be subjected to the protection of first needle tubing 33, its intensity must be too not big, thereby its caliber minimizing of can trying one's best, in addition, since long in interior needle tubing needle tubing length more outside, the generation of obstruction accident can be prevented;

5, second needle tubing 31 is extracted out, connected the empty needle tube, extract amniotic fluid, use for researchs such as clinical pathology and medical geneticies.

Claims

1, a kind of paracentesis trocar is characterized in that: by first needle tubing, second needle tubing and the 3rd needle tubing totally three needle tubings form; Described first needle tubing is a hollow tube, its lower end has angular cut, the upper end is provided with first engagement device, has the through hole that is connected with hollow tube in described first engagement device, described second needle tubing also is a hollow tube, be placed in slidably among first body, its lower end has angular cut, the upper end is provided with second engagement device, has the through hole that is connected with hollow tube in described second engagement device, its engagement device of second needle tubing that is installed in first needle tubing partly is exposed to outside first engagement device, and stretch out outside the first needle tubing angular cut lower end of its angular cut; Described the 3rd needle tubing is a hollow tube, its lower end has angular cut, the upper end has the 3rd engagement device, be placed in slidably among second needle tubing, its engagement device of the 3rd needle tubing that is installed in second needle tubing partly is exposed to outside second engagement device, and stretch out outside the second needle tubing angular cut lower end of its angular cut.

2, paracentesis trocar according to claim 1 is characterized in that: but the through hole inward flange of the engagement device of first needle tubing and second needle tubing is provided with the screw thread of winding empty needle tube.

3, paracentesis trocar according to claim 1 is characterized in that: the engagement device edge at first needle tubing and second needle tubing has breach.

4, paracentesis trocar according to claim 1 is characterized in that: be provided with the short Radix Crotalariae szemoensis that can be sticked in the first needle tubing engagement device breach on the engagement device of second needle tubing.

5, paracentesis trocar according to claim 1 is characterized in that: be provided with the short Radix Crotalariae szemoensis that can be sticked in the second needle tubing engagement device breach on the engagement device of second needle tubing.

6, paracentesis trocar according to claim 1 is characterized in that: the 3rd needle tubing is solid needle body.