Prosecution Insights
Last updated: April 19, 2026
Application No. 18/727,815

SUCTION-FLUSHING-SYSTEM AND MEDICAL INSTRUMENT

Non-Final OA §102§103
Filed
Jul 10, 2024
Examiner
GHIMIRE, SHANKAR RAJ
Art Unit
3795
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
Medizinische Hochschule Hannover
OA Round
1 (Non-Final)
76%
Grant Probability
Favorable
1-2
OA Rounds
3y 4m
To Grant
96%
With Interview

Examiner Intelligence

Grants 76% — above average
76%
Career Allow Rate
207 granted / 272 resolved
+6.1% vs TC avg
Strong +19% interview lift
Without
With
+19.4%
Interview Lift
resolved cases with interview
Typical timeline
3y 4m
Avg Prosecution
46 currently pending
Career history
318
Total Applications
across all art units

Statute-Specific Performance

§101
1.3%
-38.7% vs TC avg
§103
44.3%
+4.3% vs TC avg
§102
23.7%
-16.3% vs TC avg
§112
24.9%
-15.1% vs TC avg
Black line = Tech Center average estimate • Based on career data from 272 resolved cases

Office Action

§102 §103
Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Election Applicants’ election of claims 1-18 is acknowledged and made final. Claims 19-20 are withdrawn from further consideration. Information Disclosure Statement The information disclosure statement (IDS) submitted on 07/10/2024 is in compliance with the provisions of 37 CFR 1.97. Accordingly, the information disclosure statement is being considered by the examiner. Claim Objections Claim 1 is objected to because of the following informalities: In the amendment, the numbering of claim 1 has been mistakenly deleted. Appropriate correction is required. Claim Rejections - 35 USC § 102 The following is a quotation of the appropriate paragraphs of 35 U.S.C. 102 that form the basis for the rejections under this section made in this Office action: A person shall be entitled to a patent unless – (a)(1) the claimed invention was patented, described in a printed publication, or in public use, on sale, or otherwise available to the public before the effective filing date of the claimed invention. Claim(s) 1-3, 5-18, is/are rejected under 35 U.S.C. 102 as being anticipated by Karasawa (US 5575756). Regarding claim 1, Karasawa discloses a suction-flushing-system (FIGS. 1, 2, 4; FIGS. 2, 4 reproduced below) for a medical instrument comprising a distal region (FIG. 2) adapted for insertion into a patient, at least one optical device (cover glass 19) which is cleanable by the suction-flushing-system positioned in the distal region (FIG. 2), the suction-flushing-system (FIGS. 1-2), comprising: at least one flushing medium outlet (nozzle 23; FIG. 2) opening for discharging a flushing (water line 24) medium jet onto an outer surface of the optical device (cover glass 19); and at least one suction opening (insertion-section clearance 27; suction means 29; FIG. 2) for withdrawing by suction at least liquid components from the outer surface of the optical device. PNG media_image1.png 462 1216 media_image1.png Greyscale Regarding claim 2, Karasawa discloses wherein the suction-flushing-system is arranged for simultaneously performing ejection of the flushing medium jet onto the outer surface of the optical device via the at least one flushing medium outlet opening and for withdrawing by suction at least some of the liquid components from the optical device through the at least one suction opening (Feed water and suction (or feed gas) are made possible to be performed separately or simultaneously by the channels different from each other. FIGS. 11, 12; col. 13, lines 18-27.). Regarding claim 3, Karasawa discloses wherein characterized-in that the suction-flushing-system is arranged to suck back the predominant share of the at least one flushing medium, which has been ejected via the at least one flushing medium outlet opening through the at least one suction opening (FIGS.1, 4). Regarding claim 5, Karasawa discloses wherein the at least one flushing medium outlet opening has a smaller cross section, than a flushing channel configured to provide a flushing medium to the at least one flushing medium outlet opening (The feed water channel 22 has smaller outlet opening. FIG. 2). Regarding claim 6, Karasawa discloses at least one mechanical coupling element arranged for form fit mechanical coupling of the suction-flushing-system to the medical instrument (FIG. 4, annotated. FIG. 8, provides an example coupling element for suction means). Regarding claim 7, Karasawa discloses wherein the at least one flushing medium outlet opening has a flushing medium ejection direction with the outer surface of the optical device (The flushing medium outlet opening has a flushing medium ejection direction towards the outer surface of the optical device. FIG. 4). Regarding claim 8, Karasawa discloses wherein the at least one flushing medium outlet opening is arranged immediately adjacent to the outer surface of the optical device (FIG. 4). Regarding claim 9, Karasawa discloses wherein the at least one suction opening (nozzle 23; FIG. 2) is arranged immediately adjacent to the outer surface of the optical device. Regarding claim 10, Karasawa discloses a storage tank for storing flushing medium (Feed water means 86; FIG. 8). Regarding claim 11, Karasawa discloses a first manual actuating element (suction means 131; FIG. 20) for activating the ejection of flushing medium from the at least one flushing medium outlet opening (FIGS. 20, 21a-21c; Three-way activity plug 135 provides flushing and suctioning activity.). Regarding claim 12, Karasawa discloses a first manual actuating element (Suction means 131; FIG. 20) is arranged for manual pressurization of a storage tank (Feed water means 130; FIG. 20) which stores flushing medium. Regarding claim 13, Karasawa discloses a second manual actuating element for activating the suction (Three-way activity plug 135; FIG. 20) of at least some liquid components through the at least one suction opening can be activated (FIGS. 20, 21a-21c; Three-way activity plug 135 provides flushing and suctioning activity.). Regarding claim 14, Karasawa discloses the second actuating element is structurally integrated with the first actuating element as a combined actuating element, so that the ejection of the flushing medium and/or the suction of at least some liquid constituents selectively activated by different manual modes of actuation of the combined actuating element (Feed water and suction (or feed gas) are made possible to be performed separately or simultaneously by the channels different from each other. Col. 13, lines 18-27; FIG. 22). Regarding claim 15, Karasawa discloses wherein the combined actuating element is configured such that by different manual modes of actuation of the combined actuating element one of the following modes of operation is selected: a) no suction of at least some liquid constituents and no ejection of flushing medium, b) suction of at least some liquid components without ejection of flushing medium, c) the suction of at least some liquid components with simultaneous ejection of flushing medium (Feed water and suction (or feed gas) are made possible to be performed separately or simultaneously by the channels different from each other. FIG. 22). Regarding claim 16, Karasawa discloses that the different manual actuation modes are selectable by varying a manual pressurization of the combined actuating element (The fluid passages of the feed water tube 416 and the suction tube 417 are selectively switched through operation of a feed water button 422 and a suction button 423 provided on a valve unit 421, whereby the water feeding or suction through the tubes 416 and 417 can be turned on and off, and, further, the flow rate therein can be adjusted. Col. 27, lines 30-40). Regarding claim 17, Karasawa discloses pump (Suction means 131; FIG. 20) for generating a suctioning effect at the least one suction opening. Regarding claim 18, Karasawa discloses the pump is connectable to the at least one suction opening (Note suction means 131; FIG. 20) and an additional emission channel through a valve mechanism (Three-way activity plug 135 provides flushing and suctioning activity; FIG. 20; col. 11, line 43-col. 12, line 22), wherein the valve mechanism which selectively connects the pump either with the at least one suction opening or the additional emission channel depending on the operation mode of the pump (FIG. 20). Claim Rejections - 35 USC § 103 The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. The factual inquiries for establishing a background for determining obviousness under 35 U.S.C. 103 are summarized as follows: 1. Determining the scope and contents of the prior art. 2. Ascertaining the differences between the prior art and the claims at issue. 3. Resolving the level of ordinary skill in the pertinent art. 4. Considering objective evidence present in the application indicating obviousness or nonobviousness. Claim(s) 4 is/are rejected under 35 U.S.C. 103 as being unpatentable over Karasawa (US 5575756) in view of Zhou (US 20220125474). Regarding claim 4, Karasawa does not expressly disclose wherein the suction flushing system is arranged for one-hand operation by a person, at least for activating ejection of the flushing medium through the at least one flushing medium outlet opening and for activating the suction of at least some liquid components through the at least one suction opening. Zhou is directed to direct-vision abortion uterine curettage (abstract) and teaches a suction flushing system (suction mechanism 4, flushing mechanism 6; Para [0018]) arranged for one-hand operation by a person, at least for activating ejection of the flushing medium through the at least one flushing medium outlet opening and for activating the suction of at least some liquid components through the at least one suction opening (The medical staff may realize one-handed operation during clinical use, and the use process is more convenient. Para [0021]). It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to modify Karasawa’s device so that it can have a one-handed operation so that the use of the device is more convenient. For example, the flushing switch/plug could be arranged in the handle in accordance with the teaching of Zhou to make it capable of single-handed use for convenient use of the device. Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. See PTO -892. Any inquiry concerning this communication or earlier communications from the examiner should be directed to SHANKAR R GHIMIRE whose telephone number is (571)272-0515. The examiner can normally be reached 8 AM - 5 PM. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Anhtuan Nguyen can be reached on 571-272-4963. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /SHANKAR RAJ GHIMIRE/Examiner, Art Unit 3795 /ANH TUAN T NGUYEN/Supervisory Patent Examiner, Art Unit 3795 3/23/26
Read full office action

Prosecution Timeline

Jul 10, 2024
Application Filed
Mar 23, 2026
Non-Final Rejection — §102, §103 (current)

Precedent Cases

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Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

1-2
Expected OA Rounds
76%
Grant Probability
96%
With Interview (+19.4%)
3y 4m
Median Time to Grant
Low
PTA Risk
Based on 272 resolved cases by this examiner. Grant probability derived from career allow rate.

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